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platform_hardware_libhardware/include_all/hardware/hwcomposer2.h
Steven Moreland d783cabd4d Split up headers. 
This splits headers into three locations:
include - for backwards compatibility, the global include
include_all - for things system/vendor both use
include_vendor - for things that only vendors use

The goal is to gradually have system things stop referencing
(at least most) of these headers.

Bug: 37280010
Test: build (CL on top adds back in symlinks)

Change-Id: Ibf194276b7faa857e1e7605d7719f4e7d873ecba
2023-06-02 23:01:54 +00:00

3175 lines
136 KiB
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/*
* Copyright 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_HARDWARE_HWCOMPOSER2_H
#define ANDROID_HARDWARE_HWCOMPOSER2_H
#include <sys/cdefs.h>
#include <hardware/hardware.h>
#include "hwcomposer_defs.h"
__BEGIN_DECLS
/*
* Enums
*
* For most of these enums, there is an invalid value defined to be 0. This is
* an attempt to catch uninitialized fields, and these values should not be
* used.
*/
/* Display attributes queryable through getDisplayAttribute */
typedef enum {
HWC2_ATTRIBUTE_INVALID = 0,
/* Dimensions in pixels */
HWC2_ATTRIBUTE_WIDTH = 1,
HWC2_ATTRIBUTE_HEIGHT = 2,
/* Vsync period in nanoseconds */
HWC2_ATTRIBUTE_VSYNC_PERIOD = 3,
/* Dots per thousand inches (DPI * 1000). Scaling by 1000 allows these
* numbers to be stored in an int32_t without losing too much precision. If
* the DPI for a configuration is unavailable or is considered unreliable,
* the device may return -1 instead */
HWC2_ATTRIBUTE_DPI_X = 4,
HWC2_ATTRIBUTE_DPI_Y = 5,
/* The configuration group this config is associated to.
* Switching between configurations within the same group may be done seamlessly
* in some conditions via setActiveConfigWithConstraints. */
HWC2_ATTRIBUTE_CONFIG_GROUP = 7,
} hwc2_attribute_t;
/* Blend modes, settable per layer */
typedef enum {
HWC2_BLEND_MODE_INVALID = 0,
/* colorOut = colorSrc */
HWC2_BLEND_MODE_NONE = 1,
/* colorOut = colorSrc + colorDst * (1 - alphaSrc) */
HWC2_BLEND_MODE_PREMULTIPLIED = 2,
/* colorOut = colorSrc * alphaSrc + colorDst * (1 - alphaSrc) */
HWC2_BLEND_MODE_COVERAGE = 3,
} hwc2_blend_mode_t;
/* See the 'Callbacks' section for more detailed descriptions of what these
* functions do */
typedef enum {
HWC2_CALLBACK_INVALID = 0,
HWC2_CALLBACK_HOTPLUG = 1,
HWC2_CALLBACK_REFRESH = 2,
HWC2_CALLBACK_VSYNC = 3,
HWC2_CALLBACK_VSYNC_2_4 = 4,
HWC2_CALLBACK_VSYNC_PERIOD_TIMING_CHANGED = 5,
HWC2_CALLBACK_SEAMLESS_POSSIBLE = 6,
} hwc2_callback_descriptor_t;
/* Optional capabilities which may be supported by some devices. The particular
* set of supported capabilities for a given device may be retrieved using
* getCapabilities. */
typedef enum {
HWC2_CAPABILITY_INVALID = 0,
/* Specifies that the device supports sideband stream layers, for which
* buffer content updates and other synchronization will not be provided
* through the usual validate/present cycle and must be handled by an
* external implementation-defined mechanism. Only changes to layer state
* (such as position, size, etc.) need to be performed through the
* validate/present cycle. */
HWC2_CAPABILITY_SIDEBAND_STREAM = 1,
/* Specifies that the device will apply a color transform even when either
* the client or the device has chosen that all layers should be composed by
* the client. This will prevent the client from applying the color
* transform during its composition step. */
HWC2_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM = 2,
/* Specifies that the present fence must not be used as an accurate
* representation of the actual present time of a frame.
* This capability must never be set by HWC2 devices.
* This capability may be set for HWC1 devices that use the
* HWC2On1Adapter where emulation of the present fence using the retire
* fence is not feasible.
* In the future, CTS tests will require present time to be reliable.
*/
HWC2_CAPABILITY_PRESENT_FENCE_IS_NOT_RELIABLE = 3,
/* Specifies that a device is able to skip the validateDisplay call before
* receiving a call to presentDisplay. The client will always skip
* validateDisplay and try to call presentDisplay regardless of the changes
* in the properties of the layers. If the device returns anything else than
* HWC2_ERROR_NONE, it will call validateDisplay then presentDisplay again.
* For this capability to be worthwhile the device implementation of
* presentDisplay should fail as fast as possible in the case a
* validateDisplay step is needed.
*/
HWC2_CAPABILITY_SKIP_VALIDATE = 4,
} hwc2_capability_t;
/* Possible composition types for a given layer */
typedef enum {
HWC2_COMPOSITION_INVALID = 0,
/* The client will composite this layer into the client target buffer
* (provided to the device through setClientTarget).
*
* The device must not request any composition type changes for layers of
* this type. */
HWC2_COMPOSITION_CLIENT = 1,
/* The device will handle the composition of this layer through a hardware
* overlay or other similar means.
*
* Upon validateDisplay, the device may request a change from this type to
* HWC2_COMPOSITION_CLIENT. */
HWC2_COMPOSITION_DEVICE = 2,
/* The device will render this layer using the color set through
* setLayerColor. If this functionality is not supported on a layer that the
* client sets to HWC2_COMPOSITION_SOLID_COLOR, the device must request that
* the composition type of that layer is changed to HWC2_COMPOSITION_CLIENT
* upon the next call to validateDisplay.
*
* Upon validateDisplay, the device may request a change from this type to
* HWC2_COMPOSITION_CLIENT. */
HWC2_COMPOSITION_SOLID_COLOR = 3,
/* Similar to DEVICE, but the position of this layer may also be set
* asynchronously through setCursorPosition. If this functionality is not
* supported on a layer that the client sets to HWC2_COMPOSITION_CURSOR, the
* device must request that the composition type of that layer is changed to
* HWC2_COMPOSITION_CLIENT upon the next call to validateDisplay.
*
* Upon validateDisplay, the device may request a change from this type to
* either HWC2_COMPOSITION_DEVICE or HWC2_COMPOSITION_CLIENT. Changing to
* HWC2_COMPOSITION_DEVICE will prevent the use of setCursorPosition but
* still permit the device to composite the layer. */
HWC2_COMPOSITION_CURSOR = 4,
/* The device will handle the composition of this layer, as well as its
* buffer updates and content synchronization. Only supported on devices
* which provide HWC2_CAPABILITY_SIDEBAND_STREAM.
*
* Upon validateDisplay, the device may request a change from this type to
* either HWC2_COMPOSITION_DEVICE or HWC2_COMPOSITION_CLIENT, but it is
* unlikely that content will display correctly in these cases. */
HWC2_COMPOSITION_SIDEBAND = 5,
} hwc2_composition_t;
/* Possible connection options from the hotplug callback */
typedef enum {
HWC2_CONNECTION_INVALID = 0,
/* The display has been connected */
HWC2_CONNECTION_CONNECTED = 1,
/* The display has been disconnected */
HWC2_CONNECTION_DISCONNECTED = 2,
} hwc2_connection_t;
/* Display requests returned by getDisplayRequests */
typedef enum {
/* Instructs the client to provide a new client target buffer, even if no
* layers are marked for client composition. */
HWC2_DISPLAY_REQUEST_FLIP_CLIENT_TARGET = 1 << 0,
/* Instructs the client to write the result of client composition directly
* into the virtual display output buffer. If any of the layers are not
* marked as HWC2_COMPOSITION_CLIENT or the given display is not a virtual
* display, this request has no effect. */
HWC2_DISPLAY_REQUEST_WRITE_CLIENT_TARGET_TO_OUTPUT = 1 << 1,
} hwc2_display_request_t;
/* Display types returned by getDisplayType */
typedef enum {
HWC2_DISPLAY_TYPE_INVALID = 0,
/* All physical displays, including both internal displays and hotpluggable
* external displays */
HWC2_DISPLAY_TYPE_PHYSICAL = 1,
/* Virtual displays created by createVirtualDisplay */
HWC2_DISPLAY_TYPE_VIRTUAL = 2,
} hwc2_display_type_t;
/* Physical display types returned by getDisplayConnectionType */
typedef enum {
HWC2_DISPLAY_CONNECTION_TYPE_INTERNAL = 0,
HWC2_DISPLAY_CONNECTION_TYPE_EXTERNAL = 1,
} hwc2_display_connection_type_t;
/* Return codes from all functions */
typedef enum {
HWC2_ERROR_NONE = 0,
HWC2_ERROR_BAD_CONFIG,
HWC2_ERROR_BAD_DISPLAY,
HWC2_ERROR_BAD_LAYER,
HWC2_ERROR_BAD_PARAMETER,
HWC2_ERROR_HAS_CHANGES,
HWC2_ERROR_NO_RESOURCES,
HWC2_ERROR_NOT_VALIDATED,
HWC2_ERROR_UNSUPPORTED,
HWC2_ERROR_SEAMLESS_NOT_ALLOWED,
HWC2_ERROR_SEAMLESS_NOT_POSSIBLE,
} hwc2_error_t;
/* Function descriptors for use with getFunction */
typedef enum {
HWC2_FUNCTION_INVALID = 0,
HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES,
HWC2_FUNCTION_CREATE_LAYER,
HWC2_FUNCTION_CREATE_VIRTUAL_DISPLAY,
HWC2_FUNCTION_DESTROY_LAYER,
HWC2_FUNCTION_DESTROY_VIRTUAL_DISPLAY,
HWC2_FUNCTION_DUMP,
HWC2_FUNCTION_GET_ACTIVE_CONFIG,
HWC2_FUNCTION_GET_CHANGED_COMPOSITION_TYPES,
HWC2_FUNCTION_GET_CLIENT_TARGET_SUPPORT,
HWC2_FUNCTION_GET_COLOR_MODES,
HWC2_FUNCTION_GET_DISPLAY_ATTRIBUTE,
HWC2_FUNCTION_GET_DISPLAY_CONFIGS,
HWC2_FUNCTION_GET_DISPLAY_NAME,
HWC2_FUNCTION_GET_DISPLAY_REQUESTS,
HWC2_FUNCTION_GET_DISPLAY_TYPE,
HWC2_FUNCTION_GET_DOZE_SUPPORT,
HWC2_FUNCTION_GET_HDR_CAPABILITIES,
HWC2_FUNCTION_GET_MAX_VIRTUAL_DISPLAY_COUNT,
HWC2_FUNCTION_GET_RELEASE_FENCES,
HWC2_FUNCTION_PRESENT_DISPLAY,
HWC2_FUNCTION_REGISTER_CALLBACK,
HWC2_FUNCTION_SET_ACTIVE_CONFIG,
HWC2_FUNCTION_SET_CLIENT_TARGET,
HWC2_FUNCTION_SET_COLOR_MODE,
HWC2_FUNCTION_SET_COLOR_TRANSFORM,
HWC2_FUNCTION_SET_CURSOR_POSITION,
HWC2_FUNCTION_SET_LAYER_BLEND_MODE,
HWC2_FUNCTION_SET_LAYER_BUFFER,
HWC2_FUNCTION_SET_LAYER_COLOR,
HWC2_FUNCTION_SET_LAYER_COMPOSITION_TYPE,
HWC2_FUNCTION_SET_LAYER_DATASPACE,
HWC2_FUNCTION_SET_LAYER_DISPLAY_FRAME,
HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA,
HWC2_FUNCTION_SET_LAYER_SIDEBAND_STREAM,
HWC2_FUNCTION_SET_LAYER_SOURCE_CROP,
HWC2_FUNCTION_SET_LAYER_SURFACE_DAMAGE,
HWC2_FUNCTION_SET_LAYER_TRANSFORM,
HWC2_FUNCTION_SET_LAYER_VISIBLE_REGION,
HWC2_FUNCTION_SET_LAYER_Z_ORDER,
HWC2_FUNCTION_SET_OUTPUT_BUFFER,
HWC2_FUNCTION_SET_POWER_MODE,
HWC2_FUNCTION_SET_VSYNC_ENABLED,
HWC2_FUNCTION_VALIDATE_DISPLAY,
HWC2_FUNCTION_SET_LAYER_FLOAT_COLOR,
HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA,
HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS,
HWC2_FUNCTION_SET_READBACK_BUFFER,
HWC2_FUNCTION_GET_READBACK_BUFFER_ATTRIBUTES,
HWC2_FUNCTION_GET_READBACK_BUFFER_FENCE,
HWC2_FUNCTION_GET_RENDER_INTENTS,
HWC2_FUNCTION_SET_COLOR_MODE_WITH_RENDER_INTENT,
HWC2_FUNCTION_GET_DATASPACE_SATURATION_MATRIX,
// composer 2.3
HWC2_FUNCTION_GET_DISPLAY_IDENTIFICATION_DATA,
HWC2_FUNCTION_GET_DISPLAY_CAPABILITIES,
HWC2_FUNCTION_SET_LAYER_COLOR_TRANSFORM,
HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES,
HWC2_FUNCTION_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED,
HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLE,
HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA_BLOBS,
HWC2_FUNCTION_GET_DISPLAY_BRIGHTNESS_SUPPORT,
HWC2_FUNCTION_SET_DISPLAY_BRIGHTNESS,
// composer 2.4
HWC2_FUNCTION_GET_DISPLAY_CONNECTION_TYPE,
HWC2_FUNCTION_GET_DISPLAY_VSYNC_PERIOD,
HWC2_FUNCTION_SET_ACTIVE_CONFIG_WITH_CONSTRAINTS,
HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE,
HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES,
HWC2_FUNCTION_SET_CONTENT_TYPE,
HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY,
HWC2_FUNCTION_SET_LAYER_GENERIC_METADATA,
HWC2_FUNCTION_GET_LAYER_GENERIC_METADATA_KEY,
} hwc2_function_descriptor_t;
/* Layer requests returned from getDisplayRequests */
typedef enum {
/* The client should clear its target with transparent pixels where this
* layer would be. The client may ignore this request if the layer must be
* blended. */
HWC2_LAYER_REQUEST_CLEAR_CLIENT_TARGET = 1 << 0,
} hwc2_layer_request_t;
/* Power modes for use with setPowerMode */
typedef enum {
/* The display is fully off (blanked) */
HWC2_POWER_MODE_OFF = 0,
/* These are optional low power modes. getDozeSupport may be called to
* determine whether a given display supports these modes. */
/* The display is turned on and configured in a low power state that is
* suitable for presenting ambient information to the user, possibly with
* lower fidelity than HWC2_POWER_MODE_ON, but with greater efficiency. */
HWC2_POWER_MODE_DOZE = 1,
/* The display is configured as in HWC2_POWER_MODE_DOZE but may stop
* applying display updates from the client. This is effectively a hint to
* the device that drawing to the display has been suspended and that the
* the device should remain on in a low power state and continue displaying
* its current contents indefinitely until the power mode changes.
*
* This mode may also be used as a signal to enable hardware-based doze
* functionality. In this case, the device is free to take over the display
* and manage it autonomously to implement a low power always-on display. */
HWC2_POWER_MODE_DOZE_SUSPEND = 3,
/* The display is fully on */
HWC2_POWER_MODE_ON = 2,
} hwc2_power_mode_t;
typedef enum {
HWC2_CONTENT_TYPE_NONE = 0,
HWC2_CONTENT_TYPE_GRAPHICS = 1,
HWC2_CONTENT_TYPE_PHOTO = 2,
HWC2_CONTENT_TYPE_CINEMA = 3,
HWC2_CONTENT_TYPE_GAME = 4,
} hwc2_content_type_t;
/* Vsync values passed to setVsyncEnabled */
typedef enum {
HWC2_VSYNC_INVALID = 0,
/* Enable vsync */
HWC2_VSYNC_ENABLE = 1,
/* Disable vsync */
HWC2_VSYNC_DISABLE = 2,
} hwc2_vsync_t;
/* MUST match HIDL's V2_2::IComposerClient::PerFrameMetadataKey */
typedef enum {
/* SMPTE ST 2084:2014.
* Coordinates defined in CIE 1931 xy chromaticity space
*/
HWC2_DISPLAY_RED_PRIMARY_X = 0,
HWC2_DISPLAY_RED_PRIMARY_Y = 1,
HWC2_DISPLAY_GREEN_PRIMARY_X = 2,
HWC2_DISPLAY_GREEN_PRIMARY_Y = 3,
HWC2_DISPLAY_BLUE_PRIMARY_X = 4,
HWC2_DISPLAY_BLUE_PRIMARY_Y = 5,
HWC2_WHITE_POINT_X = 6,
HWC2_WHITE_POINT_Y = 7,
/* SMPTE ST 2084:2014.
* Units: nits
* max as defined by ST 2048: 10,000 nits
*/
HWC2_MAX_LUMINANCE = 8,
HWC2_MIN_LUMINANCE = 9,
/* CTA 861.3
* Units: nits
*/
HWC2_MAX_CONTENT_LIGHT_LEVEL = 10,
HWC2_MAX_FRAME_AVERAGE_LIGHT_LEVEL = 11,
} hwc2_per_frame_metadata_key_t;
/* SetDisplayedContentSampling values passed to setDisplayedContentSamplingEnabled */
typedef enum {
HWC2_DISPLAYED_CONTENT_SAMPLING_INVALID = 0,
/* Enable displayed content sampling */
HWC2_DISPLAYED_CONTENT_SAMPLING_ENABLE = 1,
/* Disable displayed content sampling */
HWC2_DISPLAYED_CONTENT_SAMPLING_DISABLE = 2,
} hwc2_displayed_content_sampling_t;
typedef enum {
HWC2_FORMAT_COMPONENT_0 = 1 << 0, /* The first component (eg, for RGBA_8888, this is R) */
HWC2_FORMAT_COMPONENT_1 = 1 << 1, /* The second component (eg, for RGBA_8888, this is G) */
HWC2_FORMAT_COMPONENT_2 = 1 << 2, /* The third component (eg, for RGBA_8888, this is B) */
HWC2_FORMAT_COMPONENT_3 = 1 << 3, /* The fourth component (eg, for RGBA_8888, this is A) */
} hwc2_format_color_component_t;
/* Optional display capabilities which may be supported by some displays.
* The particular set of supported capabilities for a given display may be
* retrieved using getDisplayCapabilities. */
typedef enum {
HWC2_DISPLAY_CAPABILITY_INVALID = 0,
/**
* Specifies that the display must apply a color transform even when either
* the client or the device has chosen that all layers should be composed by
* the client. This prevents the client from applying the color transform
* during its composition step.
* If getDisplayCapabilities is supported, the global capability
* HWC2_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM is ignored.
* If getDisplayCapabilities is not supported, and the global capability
* HWC2_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM is returned by getCapabilities,
* then all displays must be treated as having
* HWC2_DISPLAY_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM.
*/
HWC2_DISPLAY_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM = 1,
/**
* Specifies that the display supports PowerMode::DOZE and
* PowerMode::DOZE_SUSPEND. DOZE_SUSPEND may not provide any benefit
* over DOZE (see the definition of PowerMode for more information),
* but if both DOZE and DOZE_SUSPEND are no different from
* PowerMode::ON, the device must not claim support.
* HWC2_DISPLAY_CAPABILITY_DOZE must be returned by getDisplayCapabilities
* when getDozeSupport indicates the display supports PowerMode::DOZE and
* PowerMode::DOZE_SUSPEND.
*/
HWC2_DISPLAY_CAPABILITY_DOZE = 2,
/**
* Specified that the display supports brightness operations.
*/
HWC2_DISPLAY_CAPABILITY_BRIGHTNESS = 3,
/**
* Specifies that the display supports a low latency mode. If the connection
* to the display is via HDMI, this specifies whether Auto Low Latency Mode
* is supported. If, instead, there is an internal connection to the display,
* then this specifies that the display has some other custom low latency
* mode.
*/
HWC2_DISPLAY_CAPABILITY_AUTO_LOW_LATENCY_MODE = 5,
} hwc2_display_capability_t;
/*
* Stringification Functions
*/
#ifdef HWC2_INCLUDE_STRINGIFICATION
static inline const char* getAttributeName(hwc2_attribute_t attribute) {
switch (attribute) {
case HWC2_ATTRIBUTE_INVALID: return "Invalid";
case HWC2_ATTRIBUTE_WIDTH: return "Width";
case HWC2_ATTRIBUTE_HEIGHT: return "Height";
case HWC2_ATTRIBUTE_VSYNC_PERIOD: return "VsyncPeriod";
case HWC2_ATTRIBUTE_DPI_X: return "DpiX";
case HWC2_ATTRIBUTE_DPI_Y: return "DpiY";
case HWC2_ATTRIBUTE_CONFIG_GROUP: return "ConfigGroup";
default: return "Unknown";
}
}
static inline const char* getBlendModeName(hwc2_blend_mode_t mode) {
switch (mode) {
case HWC2_BLEND_MODE_INVALID: return "Invalid";
case HWC2_BLEND_MODE_NONE: return "None";
case HWC2_BLEND_MODE_PREMULTIPLIED: return "Premultiplied";
case HWC2_BLEND_MODE_COVERAGE: return "Coverage";
default: return "Unknown";
}
}
static inline const char* getCallbackDescriptorName(
hwc2_callback_descriptor_t desc) {
switch (desc) {
case HWC2_CALLBACK_INVALID: return "Invalid";
case HWC2_CALLBACK_HOTPLUG: return "Hotplug";
case HWC2_CALLBACK_REFRESH: return "Refresh";
case HWC2_CALLBACK_VSYNC: return "Vsync";
case HWC2_CALLBACK_VSYNC_2_4: return "Vsync2.4";
case HWC2_CALLBACK_VSYNC_PERIOD_TIMING_CHANGED: return "VsyncPeriodTimingChanged";
case HWC2_CALLBACK_SEAMLESS_POSSIBLE: return "SeamlessPossible";
default: return "Unknown";
}
}
static inline const char* getCapabilityName(hwc2_capability_t capability) {
switch (capability) {
case HWC2_CAPABILITY_INVALID: return "Invalid";
case HWC2_CAPABILITY_SIDEBAND_STREAM: return "SidebandStream";
case HWC2_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM:
return "SkipClientColorTransform";
case HWC2_CAPABILITY_PRESENT_FENCE_IS_NOT_RELIABLE:
return "PresentFenceIsNotReliable";
default: return "Unknown";
}
}
static inline const char* getCompositionName(hwc2_composition_t composition) {
switch (composition) {
case HWC2_COMPOSITION_INVALID: return "Invalid";
case HWC2_COMPOSITION_CLIENT: return "Client";
case HWC2_COMPOSITION_DEVICE: return "Device";
case HWC2_COMPOSITION_SOLID_COLOR: return "SolidColor";
case HWC2_COMPOSITION_CURSOR: return "Cursor";
case HWC2_COMPOSITION_SIDEBAND: return "Sideband";
default: return "Unknown";
}
}
static inline const char* getConnectionName(hwc2_connection_t connection) {
switch (connection) {
case HWC2_CONNECTION_INVALID: return "Invalid";
case HWC2_CONNECTION_CONNECTED: return "Connected";
case HWC2_CONNECTION_DISCONNECTED: return "Disconnected";
default: return "Unknown";
}
}
static inline const char* getDisplayRequestName(
hwc2_display_request_t request) {
switch (__BIONIC_CAST(static_cast, int, request)) {
case 0: return "None";
case HWC2_DISPLAY_REQUEST_FLIP_CLIENT_TARGET: return "FlipClientTarget";
case HWC2_DISPLAY_REQUEST_WRITE_CLIENT_TARGET_TO_OUTPUT:
return "WriteClientTargetToOutput";
case HWC2_DISPLAY_REQUEST_FLIP_CLIENT_TARGET |
HWC2_DISPLAY_REQUEST_WRITE_CLIENT_TARGET_TO_OUTPUT:
return "FlipClientTarget|WriteClientTargetToOutput";
default: return "Unknown";
}
}
static inline const char* getDisplayTypeName(hwc2_display_type_t type) {
switch (type) {
case HWC2_DISPLAY_TYPE_INVALID: return "Invalid";
case HWC2_DISPLAY_TYPE_PHYSICAL: return "Physical";
case HWC2_DISPLAY_TYPE_VIRTUAL: return "Virtual";
default: return "Unknown";
}
}
static inline const char* getDisplayConnectionTypeName(hwc2_display_connection_type_t type) {
switch (type) {
case HWC2_DISPLAY_CONNECTION_TYPE_INTERNAL: return "Internal";
case HWC2_DISPLAY_CONNECTION_TYPE_EXTERNAL: return "External";
default: return "Unknown";
}
}
static inline const char* getErrorName(hwc2_error_t error) {
switch (error) {
case HWC2_ERROR_NONE: return "None";
case HWC2_ERROR_BAD_CONFIG: return "BadConfig";
case HWC2_ERROR_BAD_DISPLAY: return "BadDisplay";
case HWC2_ERROR_BAD_LAYER: return "BadLayer";
case HWC2_ERROR_BAD_PARAMETER: return "BadParameter";
case HWC2_ERROR_HAS_CHANGES: return "HasChanges";
case HWC2_ERROR_NO_RESOURCES: return "NoResources";
case HWC2_ERROR_NOT_VALIDATED: return "NotValidated";
case HWC2_ERROR_UNSUPPORTED: return "Unsupported";
case HWC2_ERROR_SEAMLESS_NOT_ALLOWED: return "SeamlessNotAllowed";
case HWC2_ERROR_SEAMLESS_NOT_POSSIBLE: return "SeamlessNotPossible";
default: return "Unknown";
}
}
static inline const char* getFunctionDescriptorName(
hwc2_function_descriptor_t desc) {
switch (desc) {
case HWC2_FUNCTION_INVALID: return "Invalid";
case HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES:
return "AcceptDisplayChanges";
case HWC2_FUNCTION_CREATE_LAYER: return "CreateLayer";
case HWC2_FUNCTION_CREATE_VIRTUAL_DISPLAY:
return "CreateVirtualDisplay";
case HWC2_FUNCTION_DESTROY_LAYER: return "DestroyLayer";
case HWC2_FUNCTION_DESTROY_VIRTUAL_DISPLAY:
return "DestroyVirtualDisplay";
case HWC2_FUNCTION_DUMP: return "Dump";
case HWC2_FUNCTION_GET_ACTIVE_CONFIG: return "GetActiveConfig";
case HWC2_FUNCTION_GET_CHANGED_COMPOSITION_TYPES:
return "GetChangedCompositionTypes";
case HWC2_FUNCTION_GET_CLIENT_TARGET_SUPPORT:
return "GetClientTargetSupport";
case HWC2_FUNCTION_GET_COLOR_MODES: return "GetColorModes";
case HWC2_FUNCTION_GET_DISPLAY_ATTRIBUTE: return "GetDisplayAttribute";
case HWC2_FUNCTION_GET_DISPLAY_CONFIGS: return "GetDisplayConfigs";
case HWC2_FUNCTION_GET_DISPLAY_NAME: return "GetDisplayName";
case HWC2_FUNCTION_GET_DISPLAY_REQUESTS: return "GetDisplayRequests";
case HWC2_FUNCTION_GET_DISPLAY_TYPE: return "GetDisplayType";
case HWC2_FUNCTION_GET_DOZE_SUPPORT: return "GetDozeSupport";
case HWC2_FUNCTION_GET_HDR_CAPABILITIES: return "GetHdrCapabilities";
case HWC2_FUNCTION_GET_MAX_VIRTUAL_DISPLAY_COUNT:
return "GetMaxVirtualDisplayCount";
case HWC2_FUNCTION_GET_RELEASE_FENCES: return "GetReleaseFences";
case HWC2_FUNCTION_PRESENT_DISPLAY: return "PresentDisplay";
case HWC2_FUNCTION_REGISTER_CALLBACK: return "RegisterCallback";
case HWC2_FUNCTION_SET_ACTIVE_CONFIG: return "SetActiveConfig";
case HWC2_FUNCTION_SET_CLIENT_TARGET: return "SetClientTarget";
case HWC2_FUNCTION_SET_COLOR_MODE: return "SetColorMode";
case HWC2_FUNCTION_SET_COLOR_TRANSFORM: return "SetColorTransform";
case HWC2_FUNCTION_SET_CURSOR_POSITION: return "SetCursorPosition";
case HWC2_FUNCTION_SET_LAYER_BLEND_MODE: return "SetLayerBlendMode";
case HWC2_FUNCTION_SET_LAYER_BUFFER: return "SetLayerBuffer";
case HWC2_FUNCTION_SET_LAYER_COLOR: return "SetLayerColor";
case HWC2_FUNCTION_SET_LAYER_COMPOSITION_TYPE:
return "SetLayerCompositionType";
case HWC2_FUNCTION_SET_LAYER_DATASPACE: return "SetLayerDataspace";
case HWC2_FUNCTION_SET_LAYER_DISPLAY_FRAME:
return "SetLayerDisplayFrame";
case HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA: return "SetLayerPlaneAlpha";
case HWC2_FUNCTION_SET_LAYER_SIDEBAND_STREAM:
return "SetLayerSidebandStream";
case HWC2_FUNCTION_SET_LAYER_SOURCE_CROP: return "SetLayerSourceCrop";
case HWC2_FUNCTION_SET_LAYER_SURFACE_DAMAGE:
return "SetLayerSurfaceDamage";
case HWC2_FUNCTION_SET_LAYER_TRANSFORM: return "SetLayerTransform";
case HWC2_FUNCTION_SET_LAYER_VISIBLE_REGION:
return "SetLayerVisibleRegion";
case HWC2_FUNCTION_SET_LAYER_Z_ORDER: return "SetLayerZOrder";
case HWC2_FUNCTION_SET_OUTPUT_BUFFER: return "SetOutputBuffer";
case HWC2_FUNCTION_SET_POWER_MODE: return "SetPowerMode";
case HWC2_FUNCTION_SET_VSYNC_ENABLED: return "SetVsyncEnabled";
case HWC2_FUNCTION_VALIDATE_DISPLAY: return "ValidateDisplay";
case HWC2_FUNCTION_SET_LAYER_FLOAT_COLOR: return "SetLayerFloatColor";
case HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA: return "SetLayerPerFrameMetadata";
case HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS: return "GetPerFrameMetadataKeys";
case HWC2_FUNCTION_SET_READBACK_BUFFER: return "SetReadbackBuffer";
case HWC2_FUNCTION_GET_READBACK_BUFFER_ATTRIBUTES: return "GetReadbackBufferAttributes";
case HWC2_FUNCTION_GET_READBACK_BUFFER_FENCE: return "GetReadbackBufferFence";
case HWC2_FUNCTION_GET_RENDER_INTENTS: return "GetRenderIntents";
case HWC2_FUNCTION_SET_COLOR_MODE_WITH_RENDER_INTENT: return "SetColorModeWithRenderIntent";
case HWC2_FUNCTION_GET_DATASPACE_SATURATION_MATRIX: return "GetDataspaceSaturationMatrix";
// composer 2.3
case HWC2_FUNCTION_GET_DISPLAY_IDENTIFICATION_DATA: return "GetDisplayIdentificationData";
case HWC2_FUNCTION_GET_DISPLAY_CAPABILITIES: return "GetDisplayCapabilities";
case HWC2_FUNCTION_SET_LAYER_COLOR_TRANSFORM: return "SetLayerColorTransform";
case HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES: return "GetDisplayedContentSamplingAttributes";
case HWC2_FUNCTION_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED: return "SetDisplayedContentSamplingEnabled";
case HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLE: return "GetDisplayedContentSample";
case HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA_BLOBS: return "SetLayerPerFrameMetadataBlobs";
case HWC2_FUNCTION_GET_DISPLAY_BRIGHTNESS_SUPPORT: return "GetDisplayBrightnessSupport";
case HWC2_FUNCTION_SET_DISPLAY_BRIGHTNESS: return "SetDisplayBrightness";
// composer 2.4
case HWC2_FUNCTION_GET_DISPLAY_CONNECTION_TYPE: return "GetDisplayConnectionType";
case HWC2_FUNCTION_GET_DISPLAY_VSYNC_PERIOD: return "GetDisplayVsyncPeriod";
case HWC2_FUNCTION_SET_ACTIVE_CONFIG_WITH_CONSTRAINTS: return "SetActiveConfigWithConstraints";
case HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE: return "SetAutoLowLatencyMode";
case HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES: return "GetSupportedContentTypes";
case HWC2_FUNCTION_SET_CONTENT_TYPE: return "SetContentType";
case HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY: return "GetClientTargetProperty";
case HWC2_FUNCTION_SET_LAYER_GENERIC_METADATA: return "SetLayerGenericMetadata";
case HWC2_FUNCTION_GET_LAYER_GENERIC_METADATA_KEY: return "GetLayerGenericMetadataKey";
default: return "Unknown";
}
}
static inline const char* getLayerRequestName(hwc2_layer_request_t request) {
switch (__BIONIC_CAST(static_cast, int, request)) {
case 0: return "None";
case HWC2_LAYER_REQUEST_CLEAR_CLIENT_TARGET: return "ClearClientTarget";
default: return "Unknown";
}
}
static inline const char* getPowerModeName(hwc2_power_mode_t mode) {
switch (mode) {
case HWC2_POWER_MODE_OFF: return "Off";
case HWC2_POWER_MODE_DOZE_SUSPEND: return "DozeSuspend";
case HWC2_POWER_MODE_DOZE: return "Doze";
case HWC2_POWER_MODE_ON: return "On";
default: return "Unknown";
}
}
static inline const char* getContentTypeName(hwc2_content_type_t contentType) {
switch(contentType) {
case HWC2_CONTENT_TYPE_NONE: return "None";
case HWC2_CONTENT_TYPE_GRAPHICS: return "Graphics";
case HWC2_CONTENT_TYPE_PHOTO: return "Photo";
case HWC2_CONTENT_TYPE_CINEMA: return "Cinema";
case HWC2_CONTENT_TYPE_GAME: return "Game";
default: return "Unknown";
}
}
static inline const char* getTransformName(hwc_transform_t transform) {
switch (__BIONIC_CAST(static_cast, int, transform)) {
case 0: return "None";
case HWC_TRANSFORM_FLIP_H: return "FlipH";
case HWC_TRANSFORM_FLIP_V: return "FlipV";
case HWC_TRANSFORM_ROT_90: return "Rotate90";
case HWC_TRANSFORM_ROT_180: return "Rotate180";
case HWC_TRANSFORM_ROT_270: return "Rotate270";
case HWC_TRANSFORM_FLIP_H_ROT_90: return "FlipHRotate90";
case HWC_TRANSFORM_FLIP_V_ROT_90: return "FlipVRotate90";
default: return "Unknown";
}
}
static inline const char* getVsyncName(hwc2_vsync_t vsync) {
switch (vsync) {
case HWC2_VSYNC_INVALID: return "Invalid";
case HWC2_VSYNC_ENABLE: return "Enable";
case HWC2_VSYNC_DISABLE: return "Disable";
default: return "Unknown";
}
}
static inline const char* getDisplayedContentSamplingName(
hwc2_displayed_content_sampling_t sampling) {
switch (sampling) {
case HWC2_DISPLAYED_CONTENT_SAMPLING_INVALID: return "Invalid";
case HWC2_DISPLAYED_CONTENT_SAMPLING_ENABLE: return "Enable";
case HWC2_DISPLAYED_CONTENT_SAMPLING_DISABLE: return "Disable";
default: return "Unknown";
}
}
static inline const char* getFormatColorComponentName(hwc2_format_color_component_t component) {
switch (component) {
case HWC2_FORMAT_COMPONENT_0: return "FirstComponent";
case HWC2_FORMAT_COMPONENT_1: return "SecondComponent";
case HWC2_FORMAT_COMPONENT_2: return "ThirdComponent";
case HWC2_FORMAT_COMPONENT_3: return "FourthComponent";
default: return "Unknown";
}
}
static inline const char* getDisplayCapabilityName(hwc2_display_capability_t capability) {
switch (capability) {
case HWC2_DISPLAY_CAPABILITY_INVALID: return "Invalid";
case HWC2_DISPLAY_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM:
return "SkipClientColorTransform";
case HWC2_DISPLAY_CAPABILITY_DOZE:
return "Doze";
case HWC2_DISPLAY_CAPABILITY_BRIGHTNESS:
return "Brightness";
case HWC2_DISPLAY_CAPABILITY_AUTO_LOW_LATENCY_MODE:
return "AutoLowLatencyMode";
default:
return "Unknown";
}
}
#define TO_STRING(E, T, printer) \
inline std::string to_string(E value) { return printer(value); } \
inline std::string to_string(T value) { return to_string(static_cast<E>(value)); }
#else // !HWC2_INCLUDE_STRINGIFICATION
#define TO_STRING(name, printer)
#endif // HWC2_INCLUDE_STRINGIFICATION
/*
* C++11 features
*/
#ifdef HWC2_USE_CPP11
__END_DECLS
#ifdef HWC2_INCLUDE_STRINGIFICATION
#include <string>
#endif
namespace HWC2 {
enum class Attribute : int32_t {
Invalid = HWC2_ATTRIBUTE_INVALID,
Width = HWC2_ATTRIBUTE_WIDTH,
Height = HWC2_ATTRIBUTE_HEIGHT,
VsyncPeriod = HWC2_ATTRIBUTE_VSYNC_PERIOD,
DpiX = HWC2_ATTRIBUTE_DPI_X,
DpiY = HWC2_ATTRIBUTE_DPI_Y,
ConfigGroup = HWC2_ATTRIBUTE_CONFIG_GROUP,
};
TO_STRING(hwc2_attribute_t, Attribute, getAttributeName)
enum class BlendMode : int32_t {
Invalid = HWC2_BLEND_MODE_INVALID,
None = HWC2_BLEND_MODE_NONE,
Premultiplied = HWC2_BLEND_MODE_PREMULTIPLIED,
Coverage = HWC2_BLEND_MODE_COVERAGE,
};
TO_STRING(hwc2_blend_mode_t, BlendMode, getBlendModeName)
enum class Callback : int32_t {
Invalid = HWC2_CALLBACK_INVALID,
Hotplug = HWC2_CALLBACK_HOTPLUG,
Refresh = HWC2_CALLBACK_REFRESH,
Vsync = HWC2_CALLBACK_VSYNC,
Vsync_2_4 = HWC2_CALLBACK_VSYNC_2_4,
VsyncPeriodTimingChanged = HWC2_CALLBACK_VSYNC_PERIOD_TIMING_CHANGED,
SeamlessPossible = HWC2_CALLBACK_SEAMLESS_POSSIBLE,
};
TO_STRING(hwc2_callback_descriptor_t, Callback, getCallbackDescriptorName)
enum class Capability : int32_t {
Invalid = HWC2_CAPABILITY_INVALID,
SidebandStream = HWC2_CAPABILITY_SIDEBAND_STREAM,
SkipClientColorTransform = HWC2_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM,
PresentFenceIsNotReliable = HWC2_CAPABILITY_PRESENT_FENCE_IS_NOT_RELIABLE,
SkipValidate = HWC2_CAPABILITY_SKIP_VALIDATE,
};
TO_STRING(hwc2_capability_t, Capability, getCapabilityName)
enum class Composition : int32_t {
Invalid = HWC2_COMPOSITION_INVALID,
Client = HWC2_COMPOSITION_CLIENT,
Device = HWC2_COMPOSITION_DEVICE,
SolidColor = HWC2_COMPOSITION_SOLID_COLOR,
Cursor = HWC2_COMPOSITION_CURSOR,
Sideband = HWC2_COMPOSITION_SIDEBAND,
};
TO_STRING(hwc2_composition_t, Composition, getCompositionName)
enum class Connection : int32_t {
Invalid = HWC2_CONNECTION_INVALID,
Connected = HWC2_CONNECTION_CONNECTED,
Disconnected = HWC2_CONNECTION_DISCONNECTED,
};
TO_STRING(hwc2_connection_t, Connection, getConnectionName)
enum class DisplayRequest : int32_t {
FlipClientTarget = HWC2_DISPLAY_REQUEST_FLIP_CLIENT_TARGET,
WriteClientTargetToOutput =
HWC2_DISPLAY_REQUEST_WRITE_CLIENT_TARGET_TO_OUTPUT,
};
TO_STRING(hwc2_display_request_t, DisplayRequest, getDisplayRequestName)
enum class DisplayType : int32_t {
Invalid = HWC2_DISPLAY_TYPE_INVALID,
Physical = HWC2_DISPLAY_TYPE_PHYSICAL,
Virtual = HWC2_DISPLAY_TYPE_VIRTUAL,
};
TO_STRING(hwc2_display_type_t, DisplayType, getDisplayTypeName)
enum class DisplayConnectionType : uint32_t {
Internal = HWC2_DISPLAY_CONNECTION_TYPE_INTERNAL,
External = HWC2_DISPLAY_CONNECTION_TYPE_EXTERNAL,
};
TO_STRING(hwc2_display_connection_type_t, DisplayConnectionType, getDisplayConnectionTypeName)
enum class Error : int32_t {
None = HWC2_ERROR_NONE,
BadConfig = HWC2_ERROR_BAD_CONFIG,
BadDisplay = HWC2_ERROR_BAD_DISPLAY,
BadLayer = HWC2_ERROR_BAD_LAYER,
BadParameter = HWC2_ERROR_BAD_PARAMETER,
HasChanges = HWC2_ERROR_HAS_CHANGES,
NoResources = HWC2_ERROR_NO_RESOURCES,
NotValidated = HWC2_ERROR_NOT_VALIDATED,
Unsupported = HWC2_ERROR_UNSUPPORTED,
SeamlessNotAllowed = HWC2_ERROR_SEAMLESS_NOT_ALLOWED,
SeamlessNotPossible = HWC2_ERROR_SEAMLESS_NOT_POSSIBLE,
};
TO_STRING(hwc2_error_t, Error, getErrorName)
enum class FunctionDescriptor : int32_t {
Invalid = HWC2_FUNCTION_INVALID,
AcceptDisplayChanges = HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES,
CreateLayer = HWC2_FUNCTION_CREATE_LAYER,
CreateVirtualDisplay = HWC2_FUNCTION_CREATE_VIRTUAL_DISPLAY,
DestroyLayer = HWC2_FUNCTION_DESTROY_LAYER,
DestroyVirtualDisplay = HWC2_FUNCTION_DESTROY_VIRTUAL_DISPLAY,
Dump = HWC2_FUNCTION_DUMP,
GetActiveConfig = HWC2_FUNCTION_GET_ACTIVE_CONFIG,
GetChangedCompositionTypes = HWC2_FUNCTION_GET_CHANGED_COMPOSITION_TYPES,
GetClientTargetSupport = HWC2_FUNCTION_GET_CLIENT_TARGET_SUPPORT,
GetColorModes = HWC2_FUNCTION_GET_COLOR_MODES,
GetDisplayAttribute = HWC2_FUNCTION_GET_DISPLAY_ATTRIBUTE,
GetDisplayConfigs = HWC2_FUNCTION_GET_DISPLAY_CONFIGS,
GetDisplayName = HWC2_FUNCTION_GET_DISPLAY_NAME,
GetDisplayRequests = HWC2_FUNCTION_GET_DISPLAY_REQUESTS,
GetDisplayType = HWC2_FUNCTION_GET_DISPLAY_TYPE,
GetDozeSupport = HWC2_FUNCTION_GET_DOZE_SUPPORT,
GetHdrCapabilities = HWC2_FUNCTION_GET_HDR_CAPABILITIES,
GetMaxVirtualDisplayCount = HWC2_FUNCTION_GET_MAX_VIRTUAL_DISPLAY_COUNT,
GetReleaseFences = HWC2_FUNCTION_GET_RELEASE_FENCES,
PresentDisplay = HWC2_FUNCTION_PRESENT_DISPLAY,
RegisterCallback = HWC2_FUNCTION_REGISTER_CALLBACK,
SetActiveConfig = HWC2_FUNCTION_SET_ACTIVE_CONFIG,
SetClientTarget = HWC2_FUNCTION_SET_CLIENT_TARGET,
SetColorMode = HWC2_FUNCTION_SET_COLOR_MODE,
SetColorTransform = HWC2_FUNCTION_SET_COLOR_TRANSFORM,
SetCursorPosition = HWC2_FUNCTION_SET_CURSOR_POSITION,
SetLayerBlendMode = HWC2_FUNCTION_SET_LAYER_BLEND_MODE,
SetLayerBuffer = HWC2_FUNCTION_SET_LAYER_BUFFER,
SetLayerColor = HWC2_FUNCTION_SET_LAYER_COLOR,
SetLayerCompositionType = HWC2_FUNCTION_SET_LAYER_COMPOSITION_TYPE,
SetLayerDataspace = HWC2_FUNCTION_SET_LAYER_DATASPACE,
SetLayerDisplayFrame = HWC2_FUNCTION_SET_LAYER_DISPLAY_FRAME,
SetLayerPlaneAlpha = HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA,
SetLayerSidebandStream = HWC2_FUNCTION_SET_LAYER_SIDEBAND_STREAM,
SetLayerSourceCrop = HWC2_FUNCTION_SET_LAYER_SOURCE_CROP,
SetLayerSurfaceDamage = HWC2_FUNCTION_SET_LAYER_SURFACE_DAMAGE,
SetLayerTransform = HWC2_FUNCTION_SET_LAYER_TRANSFORM,
SetLayerVisibleRegion = HWC2_FUNCTION_SET_LAYER_VISIBLE_REGION,
SetLayerZOrder = HWC2_FUNCTION_SET_LAYER_Z_ORDER,
SetOutputBuffer = HWC2_FUNCTION_SET_OUTPUT_BUFFER,
SetPowerMode = HWC2_FUNCTION_SET_POWER_MODE,
SetVsyncEnabled = HWC2_FUNCTION_SET_VSYNC_ENABLED,
ValidateDisplay = HWC2_FUNCTION_VALIDATE_DISPLAY,
SetLayerFloatColor = HWC2_FUNCTION_SET_LAYER_FLOAT_COLOR,
SetLayerPerFrameMetadata = HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA,
GetPerFrameMetadataKeys = HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS,
SetReadbackBuffer = HWC2_FUNCTION_SET_READBACK_BUFFER,
GetReadbackBufferAttributes = HWC2_FUNCTION_GET_READBACK_BUFFER_ATTRIBUTES,
GetReadbackBufferFence = HWC2_FUNCTION_GET_READBACK_BUFFER_FENCE,
GetRenderIntents = HWC2_FUNCTION_GET_RENDER_INTENTS,
SetColorModeWithRenderIntent = HWC2_FUNCTION_SET_COLOR_MODE_WITH_RENDER_INTENT,
GetDataspaceSaturationMatrix = HWC2_FUNCTION_GET_DATASPACE_SATURATION_MATRIX,
// composer 2.3
GetDisplayIdentificationData = HWC2_FUNCTION_GET_DISPLAY_IDENTIFICATION_DATA,
GetDisplayCapabilities = HWC2_FUNCTION_GET_DISPLAY_CAPABILITIES,
SetLayerColorTransform = HWC2_FUNCTION_SET_LAYER_COLOR_TRANSFORM,
GetDisplayedContentSamplingAttributes = HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES,
SetDisplayedContentSamplingEnabled = HWC2_FUNCTION_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED,
GetDisplayedContentSample = HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLE,
SetLayerPerFrameMetadataBlobs = HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA_BLOBS,
GetDisplayBrightnessSupport = HWC2_FUNCTION_GET_DISPLAY_BRIGHTNESS_SUPPORT,
SetDisplayBrightness = HWC2_FUNCTION_SET_DISPLAY_BRIGHTNESS,
// composer 2.4
GetDisplayConnectionType = HWC2_FUNCTION_GET_DISPLAY_CONNECTION_TYPE,
GetDisplayVsyncPeriod = HWC2_FUNCTION_GET_DISPLAY_VSYNC_PERIOD,
SetActiveConfigWithConstraints = HWC2_FUNCTION_SET_ACTIVE_CONFIG_WITH_CONSTRAINTS,
SetAutoLowLatencyMode = HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE,
GetSupportedContentTypes = HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES,
SetContentType = HWC2_FUNCTION_SET_CONTENT_TYPE,
GetClientTargetProperty = HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY,
SetLayerGenericMetadata = HWC2_FUNCTION_SET_LAYER_GENERIC_METADATA,
GetLayerGenericMetadataKey = HWC2_FUNCTION_GET_LAYER_GENERIC_METADATA_KEY,
};
TO_STRING(hwc2_function_descriptor_t, FunctionDescriptor,
getFunctionDescriptorName)
enum class LayerRequest : int32_t {
ClearClientTarget = HWC2_LAYER_REQUEST_CLEAR_CLIENT_TARGET,
};
TO_STRING(hwc2_layer_request_t, LayerRequest, getLayerRequestName)
enum class PowerMode : int32_t {
Off = HWC2_POWER_MODE_OFF,
DozeSuspend = HWC2_POWER_MODE_DOZE_SUSPEND,
Doze = HWC2_POWER_MODE_DOZE,
On = HWC2_POWER_MODE_ON,
};
TO_STRING(hwc2_power_mode_t, PowerMode, getPowerModeName)
enum class ContentType : int32_t {
None = HWC2_CONTENT_TYPE_NONE,
Graphics = HWC2_CONTENT_TYPE_GRAPHICS,
Photo = HWC2_CONTENT_TYPE_PHOTO,
Cinema = HWC2_CONTENT_TYPE_CINEMA,
Game = HWC2_CONTENT_TYPE_GAME,
};
TO_STRING(hwc2_content_type_t, ContentType, getContentTypeName)
enum class Transform : int32_t {
None = 0,
FlipH = HWC_TRANSFORM_FLIP_H,
FlipV = HWC_TRANSFORM_FLIP_V,
Rotate90 = HWC_TRANSFORM_ROT_90,
Rotate180 = HWC_TRANSFORM_ROT_180,
Rotate270 = HWC_TRANSFORM_ROT_270,
FlipHRotate90 = HWC_TRANSFORM_FLIP_H_ROT_90,
FlipVRotate90 = HWC_TRANSFORM_FLIP_V_ROT_90,
};
TO_STRING(hwc_transform_t, Transform, getTransformName)
enum class Vsync : int32_t {
Invalid = HWC2_VSYNC_INVALID,
Enable = HWC2_VSYNC_ENABLE,
Disable = HWC2_VSYNC_DISABLE,
};
TO_STRING(hwc2_vsync_t, Vsync, getVsyncName)
enum class DisplayCapability : int32_t {
Invalid = HWC2_DISPLAY_CAPABILITY_INVALID,
SkipClientColorTransform = HWC2_DISPLAY_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM,
Doze = HWC2_DISPLAY_CAPABILITY_DOZE,
Brightness = HWC2_DISPLAY_CAPABILITY_BRIGHTNESS,
AutoLowLatencyMode = HWC2_DISPLAY_CAPABILITY_AUTO_LOW_LATENCY_MODE,
};
TO_STRING(hwc2_display_capability_t, DisplayCapability, getDisplayCapabilityName)
} // namespace HWC2
__BEGIN_DECLS
#endif // HWC2_USE_CPP11
/*
* Typedefs
*/
typedef void (*hwc2_function_pointer_t)();
typedef void* hwc2_callback_data_t;
typedef uint32_t hwc2_config_t;
typedef uint64_t hwc2_display_t;
typedef uint64_t hwc2_layer_t;
typedef uint32_t hwc2_vsync_period_t;
/*
* Device Struct
*/
typedef struct hwc2_device {
/* Must be the first member of this struct, since a pointer to this struct
* will be generated by casting from a hw_device_t* */
struct hw_device_t common;
/* getCapabilities(..., outCount, outCapabilities)
*
* Provides a list of capabilities (described in the definition of
* hwc2_capability_t above) supported by this device. This list must
* not change after the device has been loaded.
*
* Parameters:
* outCount - if outCapabilities was NULL, the number of capabilities
* which would have been returned; if outCapabilities was not NULL,
* the number of capabilities returned, which must not exceed the
* value stored in outCount prior to the call
* outCapabilities - a list of capabilities supported by this device; may
* be NULL, in which case this function must write into outCount the
* number of capabilities which would have been written into
* outCapabilities
*/
void (*getCapabilities)(struct hwc2_device* device, uint32_t* outCount,
int32_t* /*hwc2_capability_t*/ outCapabilities);
/* getFunction(..., descriptor)
*
* Returns a function pointer which implements the requested description.
*
* Parameters:
* descriptor - the function to return
*
* Returns either a function pointer implementing the requested descriptor
* or NULL if the described function is not supported by this device.
*/
hwc2_function_pointer_t (*getFunction)(struct hwc2_device* device,
int32_t /*hwc2_function_descriptor_t*/ descriptor);
} hwc2_device_t;
static inline int hwc2_open(const struct hw_module_t* module,
hwc2_device_t** device) {
return module->methods->open(module, HWC_HARDWARE_COMPOSER,
TO_HW_DEVICE_T_OPEN(device));
}
static inline int hwc2_close(hwc2_device_t* device) {
return device->common.close(&device->common);
}
/*
* Callbacks
*
* All of these callbacks take as their first parameter the callbackData which
* was provided at the time of callback registration, so this parameter is
* omitted from the described parameter lists.
*/
/* hotplug(..., display, connected)
* Descriptor: HWC2_CALLBACK_HOTPLUG
* Will be provided to all HWC2 devices
*
* Notifies the client that the given display has either been connected or
* disconnected. Every active display (even a built-in physical display) must
* trigger at least one hotplug notification, even if it only occurs immediately
* after callback registration.
*
* The client may call back into the device on the same thread to query display
* properties (such as width, height, and vsync period), and other threads may
* call into the device while the callback is in progress. The device must
* serialize calls to this callback such that only one thread is calling it at a
* time.
*
* Displays which have been connected are assumed to be in HWC2_POWER_MODE_OFF,
* and the vsync callback should not be called for a display until vsync has
* been enabled with setVsyncEnabled.
*
* Parameters:
* display - the display which has been hotplugged
* connected - whether the display has been connected or disconnected
*/
typedef void (*HWC2_PFN_HOTPLUG)(hwc2_callback_data_t callbackData,
hwc2_display_t display, int32_t /*hwc2_connection_t*/ connected);
/* refresh(..., display)
* Descriptor: HWC2_CALLBACK_REFRESH
* Will be provided to all HWC2 devices
*
* Notifies the client to trigger a screen refresh. This forces all layer state
* for this display to be resent, and the display to be validated and presented,
* even if there have been no changes.
*
* This refresh will occur some time after the callback is initiated, but not
* necessarily before it returns. This thread, however, is guaranteed not to
* call back into the device, thus it is safe to trigger this callback from
* other functions which call into the device.
*
* Parameters:
* display - the display to refresh
*/
typedef void (*HWC2_PFN_REFRESH)(hwc2_callback_data_t callbackData,
hwc2_display_t display);
/* vsync(..., display, timestamp)
* Descriptor: HWC2_CALLBACK_VSYNC
* Will be provided to all HWC2 devices
*
* Notifies the client that a vsync event has occurred. This callback must
* only be triggered when vsync is enabled for this display (through
* setVsyncEnabled).
*
* This callback should be triggered from a thread of at least
* HAL_PRIORITY_URGENT_DISPLAY with as little latency as possible, typically
* less than 0.5 ms. This thread is guaranteed not to call back into the device.
*
* Parameters:
* display - the display which has received a vsync event
* timestamp - the CLOCK_MONOTONIC time at which the vsync event occurred, in
* nanoseconds
*/
typedef void (*HWC2_PFN_VSYNC)(hwc2_callback_data_t callbackData,
hwc2_display_t display, int64_t timestamp);
/* vsync_2_4(..., display, timestamp, vsyncPeriodNanos)
* Descriptor: HWC2_CALLBACK_VSYNC_2_4
* Required for HWC2 devices for composer 2.4
*
* Notifies the client that a vsync event has occurred. This callback must
* only be triggered when vsync is enabled for this display (through
* setVsyncEnabled).
*
* This callback should be triggered from a thread of at least
* HAL_PRIORITY_URGENT_DISPLAY with as little latency as possible, typically
* less than 0.5 ms. This thread is guaranteed not to call back into the device.
*
* Parameters:
* display - the display which has received a vsync event
* timestamp - the CLOCK_MONOTONIC time at which the vsync event occurred, in
* nanoseconds
* vsyncPeriodNanos - the display vsync period in nanoseconds i.e. the next onVsync2_4 is
* expected to be called vsyncPeriod nanoseconds after this call.
*/
typedef void (*HWC2_PFN_VSYNC_2_4)(hwc2_callback_data_t callbackData,
hwc2_display_t display, int64_t timestamp, hwc2_vsync_period_t vsyncPeriodNanos);
/* vsyncPeriodTimingChanged(..., display, updated_timeline)
* Descriptor: HWC2_CALLBACK_VSYNC_PERIOD_TIMING_CHANGED
* Optional for HWC2 devices for composer 2.4
*
* Notifies the client that the previously reported timing for vsync period change has been
* updated. This may occur if the composer missed the deadline for changing the vsync period
* or the client submitted a refresh frame too late.
*
* This callback should be triggered from a thread of at least
* HAL_PRIORITY_URGENT_DISPLAY with as little latency as possible, typically
* less than 0.5 ms. This thread is guaranteed not to call back into the device.
*
* Parameters:
* display - the display which has received a vsync event
* updated_timeline - new timeline for the vsync period change
*/
typedef void (*HWC2_PFN_VSYNC_PERIOD_TIMING_CHANGED)(hwc2_callback_data_t callbackData,
hwc2_display_t display, hwc_vsync_period_change_timeline_t* updated_timeline);
/* SeamlessPossible(..., display)
* Descriptor: HWC2_CALLBACK_SEAMLESS_POSSIBLE
* Optional for HWC2 devices for composer 2.4
*
* Notifies the client that the conditions which previously led to returning SEAMLESS_NOT_POSSIBLE
* from setActiveConfigWithConstraints have changed and now seamless may be possible. Client should
* retry calling setActiveConfigWithConstraints.
*
*
* Parameters:
* display - a display setActiveConfigWithConstraints previously failed with
* SEAMLESS_NOT_POSSIBLE.
*/
typedef void (*HWC2_PFN_SEAMLESS_POSSIBLE)(hwc2_callback_data_t callbackData,
hwc2_display_t display);
/*
* Device Functions
*
* All of these functions take as their first parameter a device pointer, so
* this parameter is omitted from the described parameter lists.
*/
/* createVirtualDisplay(..., width, height, format, outDisplay)
* Descriptor: HWC2_FUNCTION_CREATE_VIRTUAL_DISPLAY
* Must be provided by all HWC2 devices
*
* Creates a new virtual display with the given width and height. The format
* passed into this function is the default format requested by the consumer of
* the virtual display output buffers. If a different format will be returned by
* the device, it should be returned in this parameter so it can be set properly
* when handing the buffers to the consumer.
*
* The display will be assumed to be on from the time the first frame is
* presented until the display is destroyed.
*
* Parameters:
* width - width in pixels
* height - height in pixels
* format - prior to the call, the default output buffer format selected by
* the consumer; after the call, the format the device will produce
* outDisplay - the newly-created virtual display; pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_UNSUPPORTED - the width or height is too large for the device to
* be able to create a virtual display
* HWC2_ERROR_NO_RESOURCES - the device is unable to create a new virtual
* display at this time
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_CREATE_VIRTUAL_DISPLAY)(
hwc2_device_t* device, uint32_t width, uint32_t height,
int32_t* /*android_pixel_format_t*/ format, hwc2_display_t* outDisplay);
/* destroyVirtualDisplay(..., display)
* Descriptor: HWC2_FUNCTION_DESTROY_VIRTUAL_DISPLAY
* Must be provided by all HWC2 devices
*
* Destroys a virtual display. After this call all resources consumed by this
* display may be freed by the device and any operations performed on this
* display should fail.
*
* Parameters:
* display - the virtual display to destroy
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - the display handle which was passed in does not
* refer to a virtual display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_DESTROY_VIRTUAL_DISPLAY)(
hwc2_device_t* device, hwc2_display_t display);
/* dump(..., outSize, outBuffer)
* Descriptor: HWC2_FUNCTION_DUMP
* Must be provided by all HWC2 devices
*
* Retrieves implementation-defined debug information, which will be displayed
* during, for example, `dumpsys SurfaceFlinger`.
*
* If called with outBuffer == NULL, the device should store a copy of the
* desired output and return its length in bytes in outSize. If the device
* already has a stored copy, that copy should be purged and replaced with a
* fresh copy.
*
* If called with outBuffer != NULL, the device should copy its stored version
* of the output into outBuffer and store how many bytes of data it copied into
* outSize. Prior to this call, the client will have populated outSize with the
* maximum number of bytes outBuffer can hold. The device must not write more
* than this amount into outBuffer. If the device does not currently have a
* stored copy, then it should return 0 in outSize.
*
* Any data written into outBuffer need not be null-terminated.
*
* Parameters:
* outSize - if outBuffer was NULL, the number of bytes needed to copy the
* device's stored output; if outBuffer was not NULL, the number of bytes
* written into it, which must not exceed the value stored in outSize
* prior to the call; pointer will be non-NULL
* outBuffer - the buffer to write the dump output into; may be NULL as
* described above; data written into this buffer need not be
* null-terminated
*/
typedef void (*HWC2_PFN_DUMP)(hwc2_device_t* device, uint32_t* outSize,
char* outBuffer);
/* getMaxVirtualDisplayCount(...)
* Descriptor: HWC2_FUNCTION_GET_MAX_VIRTUAL_DISPLAY_COUNT
* Must be provided by all HWC2 devices
*
* Returns the maximum number of virtual displays supported by this device
* (which may be 0). The client will not attempt to create more than this many
* virtual displays on this device. This number must not change for the lifetime
* of the device.
*/
typedef uint32_t (*HWC2_PFN_GET_MAX_VIRTUAL_DISPLAY_COUNT)(
hwc2_device_t* device);
/* registerCallback(..., descriptor, callbackData, pointer)
* Descriptor: HWC2_FUNCTION_REGISTER_CALLBACK
* Must be provided by all HWC2 devices
*
* Provides a callback for the device to call. All callbacks take a callbackData
* item as the first parameter, so this value should be stored with the callback
* for later use. The callbackData may differ from one callback to another. If
* this function is called multiple times with the same descriptor, later
* callbacks replace earlier ones.
*
* Parameters:
* descriptor - which callback should be set
* callBackdata - opaque data which must be passed back through the callback
* pointer - a non-NULL function pointer corresponding to the descriptor
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_PARAMETER - descriptor was invalid
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_REGISTER_CALLBACK)(
hwc2_device_t* device,
int32_t /*hwc2_callback_descriptor_t*/ descriptor,
hwc2_callback_data_t callbackData, hwc2_function_pointer_t pointer);
/* getDataspaceSaturationMatrix(..., dataspace, outMatrix)
* Descriptor: HWC2_FUNCTION_GET_DATASPACE_SATURATION_MATRIX
* Provided by HWC2 devices which don't return nullptr function pointer.
*
* Get the saturation matrix of the specified dataspace. The saturation matrix
* can be used to approximate the dataspace saturation operation performed by
* the HWC2 device when non-colorimetric mapping is allowed. It is to be
* applied on linear pixel values.
*
* Parameters:
* dataspace - the dataspace to query for
* outMatrix - a column-major 4x4 matrix (16 floats). It must be an identity
* matrix unless dataspace is HAL_DATASPACE_SRGB_LINEAR.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_PARAMETER - dataspace was invalid
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DATASPACE_SATURATION_MATRIX)(
hwc2_device_t* device, int32_t /*android_dataspace_t*/ dataspace,
float* outMatrix);
/*
* Display Functions
*
* All of these functions take as their first two parameters a device pointer
* and a display handle, so these parameters are omitted from the described
* parameter lists.
*/
/* acceptDisplayChanges(...)
* Descriptor: HWC2_FUNCTION_ACCEPT_DISPLAY_CHANGES
* Must be provided by all HWC2 devices
*
* Accepts the changes required by the device from the previous validateDisplay
* call (which may be queried using getChangedCompositionTypes) and revalidates
* the display. This function is equivalent to requesting the changed types from
* getChangedCompositionTypes, setting those types on the corresponding layers,
* and then calling validateDisplay again.
*
* After this call it must be valid to present this display. Calling this after
* validateDisplay returns 0 changes must succeed with HWC2_ERROR_NONE, but
* should have no other effect.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NOT_VALIDATED - validateDisplay has not been called
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_ACCEPT_DISPLAY_CHANGES)(
hwc2_device_t* device, hwc2_display_t display);
/* createLayer(..., outLayer)
* Descriptor: HWC2_FUNCTION_CREATE_LAYER
* Must be provided by all HWC2 devices
*
* Creates a new layer on the given display.
*
* Parameters:
* outLayer - the handle of the new layer; pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NO_RESOURCES - the device was unable to create this layer
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_CREATE_LAYER)(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t* outLayer);
/* destroyLayer(..., layer)
* Descriptor: HWC2_FUNCTION_DESTROY_LAYER
* Must be provided by all HWC2 devices
*
* Destroys the given layer.
*
* Parameters:
* layer - the handle of the layer to destroy
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_DESTROY_LAYER)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer);
/* getActiveConfig(..., outConfig)
* Descriptor: HWC2_FUNCTION_GET_ACTIVE_CONFIG
* Must be provided by all HWC2 devices
*
* Retrieves which display configuration is currently active.
*
* If no display configuration is currently active, this function must return
* HWC2_ERROR_BAD_CONFIG and place no configuration handle in outConfig. It is
* the responsibility of the client to call setActiveConfig with a valid
* configuration before attempting to present anything on the display.
*
* Parameters:
* outConfig - the currently active display configuration; pointer will be
* non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_CONFIG - no configuration is currently active
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_ACTIVE_CONFIG)(
hwc2_device_t* device, hwc2_display_t display,
hwc2_config_t* outConfig);
/* getChangedCompositionTypes(..., outNumElements, outLayers, outTypes)
* Descriptor: HWC2_FUNCTION_GET_CHANGED_COMPOSITION_TYPES
* Must be provided by all HWC2 devices
*
* Retrieves the layers for which the device requires a different composition
* type than had been set prior to the last call to validateDisplay. The client
* will either update its state with these types and call acceptDisplayChanges,
* or will set new types and attempt to validate the display again.
*
* outLayers and outTypes may be NULL to retrieve the number of elements which
* will be returned. The number of elements returned must be the same as the
* value returned in outNumTypes from the last call to validateDisplay.
*
* Parameters:
* outNumElements - if outLayers or outTypes were NULL, the number of layers
* and types which would have been returned; if both were non-NULL, the
* number of elements returned in outLayers and outTypes, which must not
* exceed the value stored in outNumElements prior to the call; pointer
* will be non-NULL
* outLayers - an array of layer handles
* outTypes - an array of composition types, each corresponding to an element
* of outLayers
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NOT_VALIDATED - validateDisplay has not been called for this
* display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_CHANGED_COMPOSITION_TYPES)(
hwc2_device_t* device, hwc2_display_t display,
uint32_t* outNumElements, hwc2_layer_t* outLayers,
int32_t* /*hwc2_composition_t*/ outTypes);
/* getClientTargetSupport(..., width, height, format, dataspace)
* Descriptor: HWC2_FUNCTION_GET_CLIENT_TARGET_SUPPORT
* Must be provided by all HWC2 devices
*
* Returns whether a client target with the given properties can be handled by
* the device.
*
* The valid formats can be found in android_pixel_format_t in
* <system/graphics.h>.
*
* For more about dataspaces, see setLayerDataspace.
*
* This function must return true for a client target with width and height
* equal to the active display configuration dimensions,
* HAL_PIXEL_FORMAT_RGBA_8888, and HAL_DATASPACE_UNKNOWN. It is not required to
* return true for any other configuration.
*
* Parameters:
* width - client target width in pixels
* height - client target height in pixels
* format - client target format
* dataspace - client target dataspace, as described in setLayerDataspace
*
* Returns HWC2_ERROR_NONE if the given configuration is supported or one of the
* following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_UNSUPPORTED - the given configuration is not supported
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_CLIENT_TARGET_SUPPORT)(
hwc2_device_t* device, hwc2_display_t display, uint32_t width,
uint32_t height, int32_t /*android_pixel_format_t*/ format,
int32_t /*android_dataspace_t*/ dataspace);
/* getColorModes(..., outNumModes, outModes)
* Descriptor: HWC2_FUNCTION_GET_COLOR_MODES
* Must be provided by all HWC2 devices
*
* Returns the color modes supported on this display.
*
* The valid color modes can be found in android_color_mode_t in
* <system/graphics.h>. All HWC2 devices must support at least
* HAL_COLOR_MODE_NATIVE.
*
* outNumModes may be NULL to retrieve the number of modes which will be
* returned.
*
* Parameters:
* outNumModes - if outModes was NULL, the number of modes which would have
* been returned; if outModes was not NULL, the number of modes returned,
* which must not exceed the value stored in outNumModes prior to the
* call; pointer will be non-NULL
* outModes - an array of color modes
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_COLOR_MODES)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outNumModes,
int32_t* /*android_color_mode_t*/ outModes);
/* getRenderIntents(..., mode, outNumIntents, outIntents)
* Descriptor: HWC2_FUNCTION_GET_RENDER_INTENTS
* Provided by HWC2 devices which don't return nullptr function pointer.
*
* Returns the render intents supported on this display.
*
* The valid render intents can be found in android_render_intent_v1_1_t in
* <system/graphics.h>. All HWC2 devices must support at least
* HAL_RENDER_INTENT_COLORIMETRIC.
*
* outNumIntents may be NULL to retrieve the number of intents which will be
* returned.
*
* Parameters:
* mode - the color mode to query the render intents for
* outNumIntents - if outIntents was NULL, the number of intents which would
* have been returned; if outIntents was not NULL, the number of intents
* returned, which must not exceed the value stored in outNumIntents
* prior to the call; pointer will be non-NULL
* outIntents - an array of render intents
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_RENDER_INTENTS)(
hwc2_device_t* device, hwc2_display_t display, int32_t mode,
uint32_t* outNumIntents,
int32_t* /*android_render_intent_v1_1_t*/ outIntents);
/* getDisplayAttribute(..., config, attribute, outValue)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_ATTRIBUTE
* Must be provided by all HWC2 devices
*
* Returns a display attribute value for a particular display configuration.
*
* Any attribute which is not supported or for which the value is unknown by the
* device must return a value of -1.
*
* Parameters:
* config - the display configuration for which to return attribute values
* attribute - the attribute to query
* outValue - the value of the attribute; the pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_CONFIG - config does not name a valid configuration for this
* display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_ATTRIBUTE)(
hwc2_device_t* device, hwc2_display_t display, hwc2_config_t config,
int32_t /*hwc2_attribute_t*/ attribute, int32_t* outValue);
/* getDisplayConfigs(..., outNumConfigs, outConfigs)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_CONFIGS
* Must be provided by all HWC2 devices
*
* Returns handles for all of the valid display configurations on this display.
*
* outConfigs may be NULL to retrieve the number of elements which will be
* returned.
*
* Parameters:
* outNumConfigs - if outConfigs was NULL, the number of configurations which
* would have been returned; if outConfigs was not NULL, the number of
* configurations returned, which must not exceed the value stored in
* outNumConfigs prior to the call; pointer will be non-NULL
* outConfigs - an array of configuration handles
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_CONFIGS)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outNumConfigs,
hwc2_config_t* outConfigs);
/* getDisplayName(..., outSize, outName)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_NAME
* Must be provided by all HWC2 devices
*
* Returns a human-readable version of the display's name.
*
* outName may be NULL to retrieve the length of the name.
*
* Parameters:
* outSize - if outName was NULL, the number of bytes needed to return the
* name if outName was not NULL, the number of bytes written into it,
* which must not exceed the value stored in outSize prior to the call;
* pointer will be non-NULL
* outName - the display's name
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_NAME)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outSize,
char* outName);
/* getDisplayRequests(..., outDisplayRequests, outNumElements, outLayers,
* outLayerRequests)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_REQUESTS
* Must be provided by all HWC2 devices
*
* Returns the display requests and the layer requests required for the last
* validated configuration.
*
* Display requests provide information about how the client should handle the
* client target. Layer requests provide information about how the client
* should handle an individual layer.
*
* If outLayers or outLayerRequests is NULL, the required number of layers and
* requests must be returned in outNumElements, but this number may also be
* obtained from validateDisplay as outNumRequests (outNumElements must be equal
* to the value returned in outNumRequests from the last call to
* validateDisplay).
*
* Parameters:
* outDisplayRequests - the display requests for the current validated state
* outNumElements - if outLayers or outLayerRequests were NULL, the number of
* elements which would have been returned, which must be equal to the
* value returned in outNumRequests from the last validateDisplay call on
* this display; if both were not NULL, the number of elements in
* outLayers and outLayerRequests, which must not exceed the value stored
* in outNumElements prior to the call; pointer will be non-NULL
* outLayers - an array of layers which all have at least one request
* outLayerRequests - the requests corresponding to each element of outLayers
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NOT_VALIDATED - validateDisplay has not been called for this
* display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_REQUESTS)(
hwc2_device_t* device, hwc2_display_t display,
int32_t* /*hwc2_display_request_t*/ outDisplayRequests,
uint32_t* outNumElements, hwc2_layer_t* outLayers,
int32_t* /*hwc2_layer_request_t*/ outLayerRequests);
/* getDisplayType(..., outType)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_TYPE
* Must be provided by all HWC2 devices
*
* Returns whether the given display is a physical or virtual display.
*
* Parameters:
* outType - the type of the display; pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_TYPE)(
hwc2_device_t* device, hwc2_display_t display,
int32_t* /*hwc2_display_type_t*/ outType);
/* getDisplayIdentificationData(..., outPort, outDataSize, outData)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_IDENTIFICATION_DATA
* Optional for HWC2 devices
*
* If supported, getDisplayIdentificationData returns the port and data that
* describe a physical display. The port is a unique number that identifies a
* physical connector (e.g. eDP, HDMI) for display output. The data blob is
* parsed to determine its format, typically EDID 1.3 as specified in VESA
* E-EDID Standard Release A Revision 1.
*
* Devices for which display identification is unsupported must return null when
* getFunction is called with HWC2_FUNCTION_GET_DISPLAY_IDENTIFICATION_DATA.
*
* Parameters:
* outPort - the connector to which the display is connected;
* pointer will be non-NULL
* outDataSize - if outData is NULL, the size in bytes of the data which would
* have been returned; if outData is not NULL, the size of outData, which
* must not exceed the value stored in outDataSize prior to the call;
* pointer will be non-NULL
* outData - the EDID 1.3 blob identifying the display
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_IDENTIFICATION_DATA)(
hwc2_device_t* device, hwc2_display_t display, uint8_t* outPort,
uint32_t* outDataSize, uint8_t* outData);
/* getDozeSupport(..., outSupport)
* Descriptor: HWC2_FUNCTION_GET_DOZE_SUPPORT
* Must be provided by all HWC2 devices
*
* Returns whether the given display supports HWC2_POWER_MODE_DOZE and
* HWC2_POWER_MODE_DOZE_SUSPEND. DOZE_SUSPEND may not provide any benefit over
* DOZE (see the definition of hwc2_power_mode_t for more information), but if
* both DOZE and DOZE_SUSPEND are no different from HWC2_POWER_MODE_ON, the
* device should not claim support.
*
* Parameters:
* outSupport - whether the display supports doze modes (1 for yes, 0 for no);
* pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DOZE_SUPPORT)(
hwc2_device_t* device, hwc2_display_t display, int32_t* outSupport);
/* getHdrCapabilities(..., outNumTypes, outTypes, outMaxLuminance,
* outMaxAverageLuminance, outMinLuminance)
* Descriptor: HWC2_FUNCTION_GET_HDR_CAPABILITIES
* Must be provided by all HWC2 devices
*
* Returns the high dynamic range (HDR) capabilities of the given display, which
* are invariant with regard to the active configuration.
*
* Displays which are not HDR-capable must return no types in outTypes and set
* outNumTypes to 0.
*
* If outTypes is NULL, the required number of HDR types must be returned in
* outNumTypes.
*
* Parameters:
* outNumTypes - if outTypes was NULL, the number of types which would have
* been returned; if it was not NULL, the number of types stored in
* outTypes, which must not exceed the value stored in outNumTypes prior
* to the call; pointer will be non-NULL
* outTypes - an array of HDR types, may have 0 elements if the display is not
* HDR-capable
* outMaxLuminance - the desired content maximum luminance for this display in
* cd/m^2; pointer will be non-NULL
* outMaxAverageLuminance - the desired content maximum frame-average
* luminance for this display in cd/m^2; pointer will be non-NULL
* outMinLuminance - the desired content minimum luminance for this display in
* cd/m^2; pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_HDR_CAPABILITIES)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outNumTypes,
int32_t* /*android_hdr_t*/ outTypes, float* outMaxLuminance,
float* outMaxAverageLuminance, float* outMinLuminance);
/* getReleaseFences(..., outNumElements, outLayers, outFences)
* Descriptor: HWC2_FUNCTION_GET_RELEASE_FENCES
* Must be provided by all HWC2 devices
*
* Retrieves the release fences for device layers on this display which will
* receive new buffer contents this frame.
*
* A release fence is a file descriptor referring to a sync fence object which
* will be signaled after the device has finished reading from the buffer
* presented in the prior frame. This indicates that it is safe to start writing
* to the buffer again. If a given layer's fence is not returned from this
* function, it will be assumed that the buffer presented on the previous frame
* is ready to be written.
*
* The fences returned by this function should be unique for each layer (even if
* they point to the same underlying sync object), and ownership of the fences
* is transferred to the client, which is responsible for closing them.
*
* If outLayers or outFences is NULL, the required number of layers and fences
* must be returned in outNumElements.
*
* Parameters:
* outNumElements - if outLayers or outFences were NULL, the number of
* elements which would have been returned; if both were not NULL, the
* number of elements in outLayers and outFences, which must not exceed
* the value stored in outNumElements prior to the call; pointer will be
* non-NULL
* outLayers - an array of layer handles
* outFences - an array of sync fence file descriptors as described above,
* each corresponding to an element of outLayers
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_RELEASE_FENCES)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outNumElements,
hwc2_layer_t* outLayers, int32_t* outFences);
/* presentDisplay(..., outPresentFence)
* Descriptor: HWC2_FUNCTION_PRESENT_DISPLAY
* Must be provided by all HWC2 devices
*
* Presents the current display contents on the screen (or in the case of
* virtual displays, into the output buffer).
*
* Prior to calling this function, the display must be successfully validated
* with validateDisplay. Note that setLayerBuffer and setLayerSurfaceDamage
* specifically do not count as layer state, so if there are no other changes
* to the layer state (or to the buffer's properties as described in
* setLayerBuffer), then it is safe to call this function without first
* validating the display.
*
* If this call succeeds, outPresentFence will be populated with a file
* descriptor referring to a present sync fence object. For physical displays,
* this fence will be signaled at the vsync when the result of composition of
* this frame starts to appear (for video-mode panels) or starts to transfer to
* panel memory (for command-mode panels). For virtual displays, this fence will
* be signaled when writes to the output buffer have completed and it is safe to
* read from it.
*
* Parameters:
* outPresentFence - a sync fence file descriptor as described above; pointer
* will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NO_RESOURCES - no valid output buffer has been set for a virtual
* display
* HWC2_ERROR_NOT_VALIDATED - validateDisplay has not successfully been called
* for this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_PRESENT_DISPLAY)(
hwc2_device_t* device, hwc2_display_t display,
int32_t* outPresentFence);
/* setActiveConfig(..., config)
* Descriptor: HWC2_FUNCTION_SET_ACTIVE_CONFIG
* Must be provided by all HWC2 devices
*
* Sets the active configuration for this display. Upon returning, the given
* display configuration should be active and remain so until either this
* function is called again or the display is disconnected.
*
* Parameters:
* config - the new display configuration
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_CONFIG - the configuration handle passed in is not valid for
* this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_ACTIVE_CONFIG)(
hwc2_device_t* device, hwc2_display_t display, hwc2_config_t config);
/* setClientTarget(..., target, acquireFence, dataspace, damage)
* Descriptor: HWC2_FUNCTION_SET_CLIENT_TARGET
* Must be provided by all HWC2 devices
*
* Sets the buffer handle which will receive the output of client composition.
* Layers marked as HWC2_COMPOSITION_CLIENT will be composited into this buffer
* prior to the call to presentDisplay, and layers not marked as
* HWC2_COMPOSITION_CLIENT should be composited with this buffer by the device.
*
* The buffer handle provided may be null if no layers are being composited by
* the client. This must not result in an error (unless an invalid display
* handle is also provided).
*
* Also provides a file descriptor referring to an acquire sync fence object,
* which will be signaled when it is safe to read from the client target buffer.
* If it is already safe to read from this buffer, -1 may be passed instead.
* The device must ensure that it is safe for the client to close this file
* descriptor at any point after this function is called.
*
* For more about dataspaces, see setLayerDataspace.
*
* The damage parameter describes a surface damage region as defined in the
* description of setLayerSurfaceDamage.
*
* Will be called before presentDisplay if any of the layers are marked as
* HWC2_COMPOSITION_CLIENT. If no layers are so marked, then it is not
* necessary to call this function. It is not necessary to call validateDisplay
* after changing the target through this function.
*
* Parameters:
* target - the new target buffer
* acquireFence - a sync fence file descriptor as described above
* dataspace - the dataspace of the buffer, as described in setLayerDataspace
* damage - the surface damage region
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - the new target handle was invalid
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_CLIENT_TARGET)(
hwc2_device_t* device, hwc2_display_t display, buffer_handle_t target,
int32_t acquireFence, int32_t /*android_dataspace_t*/ dataspace,
hwc_region_t damage);
/* setColorMode(..., mode)
* Descriptor: HWC2_FUNCTION_SET_COLOR_MODE
* Must be provided by all HWC2 devices
*
* Sets the color mode of the given display.
*
* This must be called outside of validateDisplay/presentDisplay, and it takes
* effect on next presentDisplay.
*
* The valid color modes can be found in android_color_mode_t in
* <system/graphics.h>. All HWC2 devices must support at least
* HAL_COLOR_MODE_NATIVE, and displays are assumed to be in this mode upon
* hotplug.
*
* Parameters:
* mode - the mode to set
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - mode is not a valid color mode
* HWC2_ERROR_UNSUPPORTED - mode is not supported on this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_COLOR_MODE)(
hwc2_device_t* device, hwc2_display_t display,
int32_t /*android_color_mode_t*/ mode);
/* setColorModeWithIntent(..., mode, intent)
* Descriptor: HWC2_FUNCTION_SET_COLOR_MODE_WITH_RENDER_INTENT
* Provided by HWC2 devices which don't return nullptr function pointer.
*
* This must be called outside of validateDisplay/presentDisplay, and it takes
* effect on next presentDisplay.
*
* The valid color modes and render intents can be found in
* android_color_mode_t and android_render_intent_v1_1_t in
* <system/graphics.h>. All HWC2 devices must support at least
* HAL_COLOR_MODE_NATIVE and HAL_RENDER_INTENT_COLORIMETRIC, and displays are
* assumed to be in this mode and intent upon hotplug.
*
* Parameters:
* mode - the mode to set
* intent - the intent to set
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - mode/intent is not a valid color mode or
* render intent
* HWC2_ERROR_UNSUPPORTED - mode or intent is not supported on this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_COLOR_MODE_WITH_RENDER_INTENT)(
hwc2_device_t* device, hwc2_display_t display,
int32_t /*android_color_mode_t*/ mode,
int32_t /*android_render_intent_v1_1_t */ intent);
/* setColorTransform(..., matrix, hint)
* Descriptor: HWC2_FUNCTION_SET_COLOR_TRANSFORM
* Must be provided by all HWC2 devices
*
* Sets a color transform which will be applied after composition.
*
* If hint is not HAL_COLOR_TRANSFORM_ARBITRARY, then the device may use the
* hint to apply the desired color transform instead of using the color matrix
* directly.
*
* If the device is not capable of either using the hint or the matrix to apply
* the desired color transform, it should force all layers to client composition
* during validateDisplay.
*
* If HWC2_CAPABILITY_SKIP_CLIENT_COLOR_TRANSFORM is present, then the client
* will never apply the color transform during client composition, even if all
* layers are being composed by the client.
*
* The matrix provided is an affine color transformation of the following form:
*
* |r.r r.g r.b 0|
* |g.r g.g g.b 0|
* |b.r b.g b.b 0|
* |Tr Tg Tb 1|
*
* This matrix will be provided in row-major form: {r.r, r.g, r.b, 0, g.r, ...}.
*
* Given a matrix of this form and an input color [R_in, G_in, B_in], the output
* color [R_out, G_out, B_out] will be:
*
* R_out = R_in * r.r + G_in * g.r + B_in * b.r + Tr
* G_out = R_in * r.g + G_in * g.g + B_in * b.g + Tg
* B_out = R_in * r.b + G_in * g.b + B_in * b.b + Tb
*
* Parameters:
* matrix - a 4x4 transform matrix (16 floats) as described above
* hint - a hint value which may be used instead of the given matrix unless it
* is HAL_COLOR_TRANSFORM_ARBITRARY
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - hint is not a valid color transform hint
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_COLOR_TRANSFORM)(
hwc2_device_t* device, hwc2_display_t display, const float* matrix,
int32_t /*android_color_transform_t*/ hint);
/* getPerFrameMetadataKeys(..., outKeys)
* Descriptor: HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS
* Optional for HWC2 devices
*
* If supported (getFunction(HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS) is non-null),
* getPerFrameMetadataKeys returns the list of supported PerFrameMetadataKeys
* which are invariant with regard to the active configuration.
*
* Devices which are not HDR-capable, must return null when getFunction is called
* with HWC2_FUNCTION_GET_PER_FRAME_METADATA_KEYS.
*
* If outKeys is NULL, the required number of PerFrameMetadataKey keys
* must be returned in outNumKeys.
*
* Parameters:
* outNumKeys - if outKeys is NULL, the number of keys which would have
* been returned; if outKeys is not NULL, the number of keys stored in
* outKeys, which must not exceed the value stored in outNumKeys prior
* to the call; pointer will be non-NULL
* outKeys - an array of hwc2_per_frame_metadata_key_t keys
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_PER_FRAME_METADATA_KEYS)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outNumKeys,
int32_t* /*hwc2_per_frame_metadata_key_t*/ outKeys);
/* setOutputBuffer(..., buffer, releaseFence)
* Descriptor: HWC2_FUNCTION_SET_OUTPUT_BUFFER
* Must be provided by all HWC2 devices
*
* Sets the output buffer for a virtual display. That is, the buffer to which
* the composition result will be written.
*
* Also provides a file descriptor referring to a release sync fence object,
* which will be signaled when it is safe to write to the output buffer. If it
* is already safe to write to the output buffer, -1 may be passed instead. The
* device must ensure that it is safe for the client to close this file
* descriptor at any point after this function is called.
*
* Must be called at least once before presentDisplay, but does not have any
* interaction with layer state or display validation.
*
* Parameters:
* buffer - the new output buffer
* releaseFence - a sync fence file descriptor as described above
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - the new output buffer handle was invalid
* HWC2_ERROR_UNSUPPORTED - display does not refer to a virtual display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_OUTPUT_BUFFER)(
hwc2_device_t* device, hwc2_display_t display, buffer_handle_t buffer,
int32_t releaseFence);
/* setPowerMode(..., mode)
* Descriptor: HWC2_FUNCTION_SET_POWER_MODE
* Must be provided by all HWC2 devices
*
* Sets the power mode of the given display. The transition must be complete
* when this function returns. It is valid to call this function multiple times
* with the same power mode.
*
* All displays must support HWC2_POWER_MODE_ON and HWC2_POWER_MODE_OFF. Whether
* a display supports HWC2_POWER_MODE_DOZE or HWC2_POWER_MODE_DOZE_SUSPEND may
* be queried using getDozeSupport.
*
* Parameters:
* mode - the new power mode
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - mode was not a valid power mode
* HWC2_ERROR_UNSUPPORTED - mode was a valid power mode, but is not supported
* on this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_POWER_MODE)(
hwc2_device_t* device, hwc2_display_t display,
int32_t /*hwc2_power_mode_t*/ mode);
/* getReadbackBufferAttributes(..., outFormat, outDataspace)
* Optional for HWC2 devices
*
* Returns the format which should be used when allocating a buffer for use by
* device readback as well as the dataspace in which its contents should be
* interpreted.
*
* If readback is not supported by this HWC implementation, this call will also
* be able to return HWC2_ERROR_UNSUPPORTED so we can fall back to another method.
* Returning NULL to a getFunction request for this function will also indicate
* that readback is not supported.
*
* The width and height of this buffer will be those of the currently-active
* display configuration, and the usage flags will consist of the following:
* BufferUsage::CPU_READ | BufferUsage::GPU_TEXTURE |
* BufferUsage::COMPOSER_OUTPUT
*
* The format and dataspace provided must be sufficient such that if a
* correctly-configured buffer is passed into setReadbackBuffer, filled by
* the device, and then displayed by the client as a full-screen buffer, the
* output of the display remains the same (subject to the note about protected
* content in the description of setReadbackBuffer).
*
* If the active configuration or color mode of this display has changed since
* the previous call to this function, it will be called again prior to setting
* a readback buffer such that the returned format and dataspace can be updated
* accordingly.
*
* Parameters:
* outFormat - the format the client should use when allocating a device
* readback buffer; pointer will be non-NULL
* outDataspace - the dataspace the client will use when interpreting the
* contents of a device readback buffer; pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*
* See also:
* setReadbackBuffer
* getReadbackBufferFence
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_READBACK_BUFFER_ATTRIBUTES)(
hwc2_device_t* device, hwc2_display_t display,
int32_t* /*android_pixel_format_t*/ outFormat,
int32_t* /*android_dataspace_t*/ outDataspace);
/* getReadbackBufferFence(..., outFence)
* Optional for HWC2 devices
*
* Returns an acquire sync fence file descriptor which will signal when the
* buffer provided to setReadbackBuffer has been filled by the device and is
* safe for the client to read.
*
* If it is already safe to read from this buffer, -1 may be returned instead.
* The client takes ownership of this file descriptor and is responsible for
* closing it when it is no longer needed.
*
* This function will be called immediately after the composition cycle being
* captured into the readback buffer. The complete ordering of a readback buffer
* capture is as follows:
*
* getReadbackBufferAttributes
* // Readback buffer is allocated
* // Many frames may pass
*
* setReadbackBuffer
* validateDisplay
* presentDisplay
* getReadbackBufferFence
* // Implicitly wait on the acquire fence before accessing the buffer
*
* Parameters:
* outFence - a sync fence file descriptor as described above; pointer
* will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NO_RESOURCES - the readback operation was successful, but
* resulted in a different validate result than would have occurred
* without readback
* HWC2_ERROR_UNSUPPORTED - the readback operation was unsuccessful because
* of resource constraints, the presence of protected content, or other
* reasons; -1 must be returned in outFence
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_READBACK_BUFFER_FENCE)(
hwc2_device_t* device, hwc2_display_t display,
int32_t* outFence);
/* setReadbackBuffer(..., buffer, releaseFence)
* Optional for HWC2 devices
*
* Sets the readback buffer to be filled with the contents of the next
* composition performed for this display (i.e., the contents present at the
* time of the next validateDisplay/presentDisplay cycle).
*
* This buffer will have been allocated as described in
* getReadbackBufferAttributes and will be interpreted as being in the dataspace
* provided by the same.
*
* If there is hardware protected content on the display at the time of the next
* composition, the area of the readback buffer covered by such content must be
* completely black. Any areas of the buffer not covered by such content may
* optionally be black as well.
*
* The release fence file descriptor provided works identically to the one
* described for setOutputBuffer.
*
* This function will not be called between any call to validateDisplay and a
* subsequent call to presentDisplay.
*
* Parameters:
* buffer - the new readback buffer
* releaseFence - a sync fence file descriptor as described in setOutputBuffer
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - the new readback buffer handle was invalid
*
* See also:
* getReadbackBufferAttributes
* getReadbackBufferFence
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_READBACK_BUFFER)(
hwc2_device_t* device, hwc2_display_t display,
buffer_handle_t buffer, int32_t releaseFence);
/* setVsyncEnabled(..., enabled)
* Descriptor: HWC2_FUNCTION_SET_VSYNC_ENABLED
* Must be provided by all HWC2 devices
*
* Enables or disables the vsync signal for the given display. Virtual displays
* never generate vsync callbacks, and any attempt to enable vsync for a virtual
* display though this function must return HWC2_ERROR_NONE and have no other
* effect.
*
* Parameters:
* enabled - whether to enable or disable vsync
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - enabled was an invalid value
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_VSYNC_ENABLED)(
hwc2_device_t* device, hwc2_display_t display,
int32_t /*hwc2_vsync_t*/ enabled);
/* validateDisplay(..., outNumTypes, outNumRequests)
* Descriptor: HWC2_FUNCTION_VALIDATE_DISPLAY
* Must be provided by all HWC2 devices
*
* Instructs the device to inspect all of the layer state and determine if
* there are any composition type changes necessary before presenting the
* display. Permitted changes are described in the definition of
* hwc2_composition_t above.
*
* Also returns the number of layer requests required
* by the given layer configuration.
*
* Parameters:
* outNumTypes - the number of composition type changes required by the
* device; if greater than 0, the client must either set and validate new
* types, or call acceptDisplayChanges to accept the changes returned by
* getChangedCompositionTypes; must be the same as the number of changes
* returned by getChangedCompositionTypes (see the declaration of that
* function for more information); pointer will be non-NULL
* outNumRequests - the number of layer requests required by this layer
* configuration; must be equal to the number of layer requests returned
* by getDisplayRequests (see the declaration of that function for
* more information); pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE if no changes are necessary and it is safe to present
* the display using the current layer state. Otherwise returns one of the
* following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_HAS_CHANGES - outNumTypes was greater than 0 (see parameter list
* for more information)
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_VALIDATE_DISPLAY)(
hwc2_device_t* device, hwc2_display_t display,
uint32_t* outNumTypes, uint32_t* outNumRequests);
/*
* Layer Functions
*
* These are functions which operate on layers, but which do not modify state
* that must be validated before use. See also 'Layer State Functions' below.
*
* All of these functions take as their first three parameters a device pointer,
* a display handle for the display which contains the layer, and a layer
* handle, so these parameters are omitted from the described parameter lists.
*/
/* setCursorPosition(..., x, y)
* Descriptor: HWC2_FUNCTION_SET_CURSOR_POSITION
* Must be provided by all HWC2 devices
*
* Asynchonously sets the position of a cursor layer.
*
* Prior to validateDisplay, a layer may be marked as HWC2_COMPOSITION_CURSOR.
* If validation succeeds (i.e., the device does not request a composition
* change for that layer), then once a buffer has been set for the layer and it
* has been presented, its position may be set by this function at any time
* between presentDisplay and any subsequent validateDisplay calls for this
* display.
*
* Once validateDisplay is called, this function will not be called again until
* the validate/present sequence is completed.
*
* May be called from any thread so long as it is not interleaved with the
* validate/present sequence as described above.
*
* Parameters:
* x - the new x coordinate (in pixels from the left of the screen)
* y - the new y coordinate (in pixels from the top of the screen)
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_LAYER - the layer is invalid or is not currently marked as
* HWC2_COMPOSITION_CURSOR
* HWC2_ERROR_NOT_VALIDATED - the device is currently in the middle of the
* validate/present sequence
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_CURSOR_POSITION)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
int32_t x, int32_t y);
/* setLayerBuffer(..., buffer, acquireFence)
* Descriptor: HWC2_FUNCTION_SET_LAYER_BUFFER
* Must be provided by all HWC2 devices
*
* Sets the buffer handle to be displayed for this layer. If the buffer
* properties set at allocation time (width, height, format, and usage) have not
* changed since the previous frame, it is not necessary to call validateDisplay
* before calling presentDisplay unless new state needs to be validated in the
* interim.
*
* Also provides a file descriptor referring to an acquire sync fence object,
* which will be signaled when it is safe to read from the given buffer. If it
* is already safe to read from the buffer, -1 may be passed instead. The
* device must ensure that it is safe for the client to close this file
* descriptor at any point after this function is called.
*
* This function must return HWC2_ERROR_NONE and have no other effect if called
* for a layer with a composition type of HWC2_COMPOSITION_SOLID_COLOR (because
* it has no buffer) or HWC2_COMPOSITION_SIDEBAND or HWC2_COMPOSITION_CLIENT
* (because synchronization and buffer updates for these layers are handled
* elsewhere).
*
* Parameters:
* buffer - the buffer handle to set
* acquireFence - a sync fence file descriptor as described above
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
* HWC2_ERROR_BAD_PARAMETER - the buffer handle passed in was invalid
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_BUFFER)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
buffer_handle_t buffer, int32_t acquireFence);
/* setLayerSurfaceDamage(..., damage)
* Descriptor: HWC2_FUNCTION_SET_LAYER_SURFACE_DAMAGE
* Must be provided by all HWC2 devices
*
* Provides the region of the source buffer which has been modified since the
* last frame. This region does not need to be validated before calling
* presentDisplay.
*
* Once set through this function, the damage region remains the same until a
* subsequent call to this function.
*
* If damage.numRects > 0, then it may be assumed that any portion of the source
* buffer not covered by one of the rects has not been modified this frame. If
* damage.numRects == 0, then the whole source buffer must be treated as if it
* has been modified.
*
* If the layer's contents are not modified relative to the prior frame, damage
* will contain exactly one empty rect([0, 0, 0, 0]).
*
* The damage rects are relative to the pre-transformed buffer, and their origin
* is the top-left corner. They will not exceed the dimensions of the latched
* buffer.
*
* Parameters:
* damage - the new surface damage region
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_SURFACE_DAMAGE)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
hwc_region_t damage);
/* setLayerPerFrameMetadata(..., numMetadata, metadata)
* Descriptor: HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA
* Optional for HWC2 devices
*
* If supported (getFunction(HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA) is
* non-null), sets the metadata for the given display for all following
* frames.
*
* Upon returning from this function, the metadata change must have
* fully taken effect.
*
* This function will only be called if getPerFrameMetadataKeys is non-NULL
* and returns at least one key.
*
* Parameters:
* numElements is the number of elements in each of the keys and metadata arrays
* keys is a pointer to the array of keys.
* outMetadata is a pointer to the corresponding array of metadata.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - metadata is not valid
* HWC2_ERROR_UNSUPPORTED - metadata is not supported on this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_PER_FRAME_METADATA)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
uint32_t numElements, const int32_t* /*hw2_per_frame_metadata_key_t*/ keys,
const float* metadata);
/* setLayerPerFrameMetadataBlobs(...,numElements, keys, sizes, blobs)
* Descriptor: HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA_BLOBS
* Optional for HWC2 devices
*
* If supported, (getFunction(HWC2_FUNCTION_SET_LAYER_PER_FRAME_METADATA_BLOBS)
* is non-null), sets the metadata for the given display and layer.
*
* Upon returning from this function, the metadata change must have fully taken
* effect.
*
* This function must only be called if getPerFrameMetadataKeys is non-NULL
* and returns at least one key that corresponds to a blob type.
*
* Current valid blob type keys are: HDR10_PLUS_SEI
*
* Parameters:
* numElements is the number of elements in each of the keys, sizes, and
* metadata arrays
* keys is a pointer to an array of keys. Current valid keys are those listed
* above as valid blob type keys.
* sizes is a pointer to an array of unsigned ints specifying the sizes of
* each metadata blob
* metadata is a pointer to a blob of data holding all blobs contiguously in
* memory
*
* Returns HWC2_ERROR_NONE or one of the following erros:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_PARAMETER - sizes of keys and metadata parameters does
* not match numElements, numElements < 0, or keys contains a
* non-valid key (see above for current valid blob type keys).
* HWC2_ERROR_UNSUPPORTED - metadata is not supported on this display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_PER_FRAME_METADATA_BLOBS)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
uint32_t numElements, const int32_t* keys, const uint32_t* sizes,
const uint8_t* metadata);
/*
* Layer State Functions
*
* These functions modify the state of a given layer. They do not take effect
* until the display configuration is successfully validated with
* validateDisplay and the display contents are presented with presentDisplay.
*
* All of these functions take as their first three parameters a device pointer,
* a display handle for the display which contains the layer, and a layer
* handle, so these parameters are omitted from the described parameter lists.
*/
/* setLayerBlendMode(..., mode)
* Descriptor: HWC2_FUNCTION_SET_LAYER_BLEND_MODE
* Must be provided by all HWC2 devices
*
* Sets the blend mode of the given layer.
*
* Parameters:
* mode - the new blend mode
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
* HWC2_ERROR_BAD_PARAMETER - an invalid blend mode was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_BLEND_MODE)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
int32_t /*hwc2_blend_mode_t*/ mode);
/* setLayerColor(..., color)
* Descriptor: HWC2_FUNCTION_SET_LAYER_COLOR
* Must be provided by all HWC2 devices
*
* Sets the color of the given layer. If the composition type of the layer is
* not HWC2_COMPOSITION_SOLID_COLOR, this call must return HWC2_ERROR_NONE and
* have no other effect.
*
* Parameters:
* color - the new color
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_COLOR)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
hwc_color_t color);
/* setLayerFloatColor(..., color)
* Descriptor: HWC2_FUNCTION_SET_LAYER_FLOAT_COLOR
* Provided by HWC2 devices which don't return nullptr function pointer.
*
* Sets the color of the given layer. If the composition type of the layer is
* not HWC2_COMPOSITION_SOLID_COLOR, this call must return HWC2_ERROR_NONE and
* have no other effect.
*
* Parameters:
* color - the new color in float type, rage is [0.0, 1.0], the colorspace is
* defined by the dataspace that gets set by calling setLayerDataspace.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_FLOAT_COLOR)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
hwc_float_color_t color);
/* setLayerCompositionType(..., type)
* Descriptor: HWC2_FUNCTION_SET_LAYER_COMPOSITION_TYPE
* Must be provided by all HWC2 devices
*
* Sets the desired composition type of the given layer. During validateDisplay,
* the device may request changes to the composition types of any of the layers
* as described in the definition of hwc2_composition_t above.
*
* Parameters:
* type - the new composition type
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
* HWC2_ERROR_BAD_PARAMETER - an invalid composition type was passed in
* HWC2_ERROR_UNSUPPORTED - a valid composition type was passed in, but it is
* not supported by this device
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_COMPOSITION_TYPE)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
int32_t /*hwc2_composition_t*/ type);
/* setLayerDataspace(..., dataspace)
* Descriptor: HWC2_FUNCTION_SET_LAYER_DATASPACE
* Must be provided by all HWC2 devices
*
* Sets the dataspace that the current buffer on this layer is in.
*
* The dataspace provides more information about how to interpret the buffer
* contents, such as the encoding standard and color transform.
*
* See the values of android_dataspace_t in <system/graphics.h> for more
* information.
*
* Parameters:
* dataspace - the new dataspace
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_DATASPACE)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
int32_t /*android_dataspace_t*/ dataspace);
/* setLayerDisplayFrame(..., frame)
* Descriptor: HWC2_FUNCTION_SET_LAYER_DISPLAY_FRAME
* Must be provided by all HWC2 devices
*
* Sets the display frame (the portion of the display covered by a layer) of the
* given layer. This frame will not exceed the display dimensions.
*
* Parameters:
* frame - the new display frame
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_DISPLAY_FRAME)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
hwc_rect_t frame);
/* setLayerPlaneAlpha(..., alpha)
* Descriptor: HWC2_FUNCTION_SET_LAYER_PLANE_ALPHA
* Must be provided by all HWC2 devices
*
* Sets an alpha value (a floating point value in the range [0.0, 1.0]) which
* will be applied to the whole layer. It can be conceptualized as a
* preprocessing step which applies the following function:
* if (blendMode == HWC2_BLEND_MODE_PREMULTIPLIED)
* out.rgb = in.rgb * planeAlpha
* out.a = in.a * planeAlpha
*
* If the device does not support this operation on a layer which is marked
* HWC2_COMPOSITION_DEVICE, it must request a composition type change to
* HWC2_COMPOSITION_CLIENT upon the next validateDisplay call.
*
* Parameters:
* alpha - the plane alpha value to apply
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_PLANE_ALPHA)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
float alpha);
/* setLayerSidebandStream(..., stream)
* Descriptor: HWC2_FUNCTION_SET_LAYER_SIDEBAND_STREAM
* Provided by HWC2 devices which support HWC2_CAPABILITY_SIDEBAND_STREAM
*
* Sets the sideband stream for this layer. If the composition type of the given
* layer is not HWC2_COMPOSITION_SIDEBAND, this call must return HWC2_ERROR_NONE
* and have no other effect.
*
* Parameters:
* stream - the new sideband stream
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
* HWC2_ERROR_BAD_PARAMETER - an invalid sideband stream was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_SIDEBAND_STREAM)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
const native_handle_t* stream);
/* setLayerSourceCrop(..., crop)
* Descriptor: HWC2_FUNCTION_SET_LAYER_SOURCE_CROP
* Must be provided by all HWC2 devices
*
* Sets the source crop (the portion of the source buffer which will fill the
* display frame) of the given layer. This crop rectangle will not exceed the
* dimensions of the latched buffer.
*
* If the device is not capable of supporting a true float source crop (i.e., it
* will truncate or round the floats to integers), it should set this layer to
* HWC2_COMPOSITION_CLIENT when crop is non-integral for the most accurate
* rendering.
*
* If the device cannot support float source crops, but still wants to handle
* the layer, it should use the following code (or similar) to convert to
* an integer crop:
* intCrop.left = (int) ceilf(crop.left);
* intCrop.top = (int) ceilf(crop.top);
* intCrop.right = (int) floorf(crop.right);
* intCrop.bottom = (int) floorf(crop.bottom);
*
* Parameters:
* crop - the new source crop
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_SOURCE_CROP)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
hwc_frect_t crop);
/* setLayerTransform(..., transform)
* Descriptor: HWC2_FUNCTION_SET_LAYER_TRANSFORM
* Must be provided by all HWC2 devices
*
* Sets the transform (rotation/flip) of the given layer.
*
* Parameters:
* transform - the new transform
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
* HWC2_ERROR_BAD_PARAMETER - an invalid transform was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_TRANSFORM)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
int32_t /*hwc_transform_t*/ transform);
/* setLayerVisibleRegion(..., visible)
* Descriptor: HWC2_FUNCTION_SET_LAYER_VISIBLE_REGION
* Must be provided by all HWC2 devices
*
* Specifies the portion of the layer that is visible, including portions under
* translucent areas of other layers. The region is in screen space, and will
* not exceed the dimensions of the screen.
*
* Parameters:
* visible - the new visible region, in screen space
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_VISIBLE_REGION)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
hwc_region_t visible);
/* setLayerZOrder(..., z)
* Descriptor: HWC2_FUNCTION_SET_LAYER_Z_ORDER
* Must be provided by all HWC2 devices
*
* Sets the desired Z order (height) of the given layer. A layer with a greater
* Z value occludes a layer with a lesser Z value.
*
* Parameters:
* z - the new Z order
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_Z_ORDER)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
uint32_t z);
/* setLayerColorTransform(..., matrix)
* Descriptor: HWC2_FUNCTION_SET_LAYER_COLOR_TRANSFORM
* Optional by all HWC2 devices
*
* Sets a matrix for color transform which will be applied on this layer
* before composition.
*
* If the device is not capable of apply the matrix on this layer, it must force
* this layer to client composition during VALIDATE_DISPLAY.
*
* The matrix provided is an affine color transformation of the following form:
*
* |r.r r.g r.b 0|
* |g.r g.g g.b 0|
* |b.r b.g b.b 0|
* |Tr Tg Tb 1|
*
* This matrix must be provided in row-major form:
*
* {r.r, r.g, r.b, 0, g.r, ...}.
*
* Given a matrix of this form and an input color [R_in, G_in, B_in],
* the input color must first be converted to linear space
* [R_linear, G_linear, B_linear], then the output linear color
* [R_out_linear, G_out_linear, B_out_linear] will be:
*
* R_out_linear = R_linear * r.r + G_linear * g.r + B_linear * b.r + Tr
* G_out_linear = R_linear * r.g + G_linear * g.g + B_linear * b.g + Tg
* B_out_linear = R_linear * r.b + G_linear * g.b + B_linear * b.b + Tb
*
* [R_out_linear, G_out_linear, B_out_linear] must then be converted to
* gamma space: [R_out, G_out, B_out] before blending.
*
* Parameters:
* matrix - a 4x4 transform matrix (16 floats) as described above
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_LAYER_COLOR_TRANSFORM)(
hwc2_device_t* device, hwc2_display_t display, hwc2_layer_t layer,
const float* matrix);
/* getDisplayedContentSamplingAttributes(...,
* format, dataspace, supported_components, max_frames)
* Descriptor: HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES
* Optional by all HWC2 devices
*
* Query for what types of color sampling the hardware supports.
*
* Parameters:
* format - The format of the sampled pixels; pointer will be non-NULL
* dataspace - The dataspace of the sampled pixels; pointer will be non-NULL
* supported_components - The mask of which components can be sampled; pointer
* will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY when an invalid display was passed in, or
* HWC2_ERROR_UNSUPPORTED when there is no efficient way to sample.
*/
typedef int32_t (*HWC2_PFN_GET_DISPLAYED_CONTENT_SAMPLING_ATTRIBUTES)(
hwc2_device_t* device, hwc2_display_t display,
int32_t* /* android_pixel_format_t */ format,
int32_t* /* android_dataspace_t */ dataspace,
uint8_t* /* mask of android_component_t */ supported_components);
/* setDisplayedContentSamplingEnabled(..., enabled)
* Descriptor: HWC2_FUNCTION_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED
* Optional by all HWC2 devices
*
* Enables or disables the collection of color content statistics
* on this display.
*
* Sampling occurs on the contents of the final composition on this display
* (i.e., the contents presented on screen).
*
* Sampling support is optional, and is set to DISABLE by default.
* On each call to ENABLE, all collected statistics will be reset.
*
* Sample data can be queried via getDisplayedContentSample().
*
* Parameters:
* enabled - indicates whether to enable or disable sampling.
* component_mask - The mask of which components should be sampled.
* If zero, all supported components are to be enabled.
* max_frames - is the maximum number of frames that should be stored before
* discard. The sample represents the most-recently posted frames.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY when an invalid display handle was passed in,
* HWC2_ERROR_BAD_PARAMETER when enabled was an invalid value, or
* HWC2_ERROR_NO_RESOURCES when the requested ringbuffer size via max_frames
* was not available.
* HWC2_ERROR_UNSUPPORTED when there is no efficient way to sample.
*/
typedef int32_t (*HWC2_PFN_SET_DISPLAYED_CONTENT_SAMPLING_ENABLED)(
hwc2_device_t* device, hwc2_display_t display,
int32_t /*hwc2_displayed_content_sampling_t*/ enabled,
uint8_t /* mask of android_component_t */ component_mask,
uint64_t max_frames);
/* getDisplayedContentSample(..., component, max_frames, timestamp,
* samples_size, samples, frame_count)
* Descriptor: HWC2_FUNCTION_GET_DISPLAYED_CONTENT_SAMPLE
* Optional by all HWC2 devices
*
* Collects the results of display content color sampling for display.
*
* Collection of data can occur whether the sampling is in ENABLE or
* DISABLE state.
*
* Parameters:
* max_frames - is the maximum number of frames that should be represented in
* the sample. The sample represents the most-recently posted frames.
* If max_frames is 0, all frames are to be represented by the sample.
* timestamp - is the timestamp after which any frames were posted that should
* be included in the sample. Timestamp is CLOCK_MONOTONIC.
* If timestamp is 0, do not filter from the sample by time.
* frame_count - The number of frames represented by this sample; pointer will
* be non-NULL.
* samples_size - The sizes of the color histogram representing the color
* sampling. Sample_sizes are indexed in the same order as
* HWC2_FORMAT_COMPONENT_.
* samples - The arrays of data corresponding to the sampling data. Samples are
* indexed in the same order as HWC2_FORMAT_COMPONENT_.
* The size of each sample is the samples_size for the same index.
* Each components sample is an array that is to be filled with the
* evenly-weighted buckets of a histogram counting how many times a pixel
* of the given component was displayed onscreen. Caller owns the data and
* pointer may be NULL to query samples_size.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY when an invalid display was passed in, or
* HWC2_ERROR_UNSUPPORTED when there is no efficient way to sample, or
* HWC2_ERROR_BAD_PARAMETER when the component is not supported by the hardware.
*/
typedef int32_t (*HWC2_PFN_GET_DISPLAYED_CONTENT_SAMPLE)(
hwc2_device_t* device, hwc2_display_t display,
uint64_t max_frames, uint64_t timestamp,
uint64_t* frame_count, int32_t samples_size[4], uint64_t* samples[4]);
/* getDisplayCapabilities(..., outCapabilities)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_CAPABILITIES
* Required for HWC2 devices for composer 2.3
* Optional for HWC2 devices for composer 2.1 and 2.2
*
* getDisplayCapabilities returns a list of supported capabilities
* (as described in the definition of Capability above).
* This list must not change after initialization.
*
* Parameters:
* outNumCapabilities - if outCapabilities was nullptr, returns the number of capabilities
* if outCapabilities was not nullptr, returns the number of capabilities stored in
* outCapabilities, which must not exceed the value stored in outNumCapabilities prior
* to the call; pointer will be non-NULL
* outCapabilities - a list of supported capabilities.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_CAPABILITIES)(
hwc2_device_t* device, hwc2_display_t display, uint32_t* outNumCapabilities,
uint32_t* outCapabilities);
/* Use getDisplayCapabilities instead. If brightness is supported, must return
* DisplayCapability::BRIGHTNESS as one of the display capabilities via getDisplayCapabilities.
* Only use getDisplayCapabilities as the source of truth to query brightness support.
*
* getDisplayBrightnessSupport(displayToken)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_BRIGHTNESS_SUPPORT
* Required for HWC2 devices for composer 2.3
* Optional for HWC2 devices for composer 2.1 and 2.2
*
* getDisplayBrightnessSupport returns whether brightness operations are supported on a display.
*
* Parameters:
* outSupport - whether the display supports operations.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY when the display is invalid.
*/
typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_GET_DISPLAY_BRIGHTNESS_SUPPORT)(hwc2_device_t* device,
hwc2_display_t display, bool* outSupport);
/* setDisplayBrightness(displayToken, brightnesss)
* Descriptor: HWC2_FUNCTION_SET_DISPLAY_BRIGHTNESS
* Required for HWC2 devices for composer 2.3
* Optional for HWC2 devices for composer 2.1 and 2.2
*
* setDisplayBrightness sets the brightness of a display.
*
* Parameters:
* brightness - a number between 0.0f (minimum brightness) and 1.0f (maximum brightness), or
* -1.0f to turn the backlight off.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY when the display is invalid, or
* HWC2_ERROR_UNSUPPORTED when brightness operations are not supported, or
* HWC2_ERROR_BAD_PARAMETER when the brightness is invalid, or
* HWC2_ERROR_NO_RESOURCES when the brightness cannot be applied.
*/
typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_SET_DISPLAY_BRIGHTNESS)(hwc2_device_t* device,
hwc2_display_t display, float brightness);
/* Composer 2.4 additions */
/* getDisplayConnectionType(..., outType)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_CONNECTION_TYPE
* Optional for all HWC2 devices
*
* Returns whether the given physical display is internal or external.
*
* Parameters:
* outType - the connection type of the display; pointer will be non-NULL
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY when the display is invalid or virtual.
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_CONNECTION_TYPE)(
hwc2_device_t* device, hwc2_display_t display,
uint32_t* /*hwc2_display_connection_type_t*/ outType);
/* getDisplayVsyncPeriod(..., outVsyncPeriods)
* Descriptor: HWC2_FUNCTION_GET_DISPLAY_VSYNC_PERIOD
* Required for HWC2 devices for composer 2.4
*
* Retrieves which vsync period the display is currently using.
*
* If no display configuration is currently active, this function must
* return BAD_CONFIG. If a vsync period is about to change due to a
* setActiveConfigWithConstraints call, this function must return the current vsync period
* until the change has taken place.
*
* Parameters:
* outVsyncPeriod - the current vsync period of the display.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_CONFIG - no configuration is currently active
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_DISPLAY_VSYNC_PERIOD)(
hwc2_device_t* device, hwc2_display_t display, hwc2_vsync_period_t* outVsyncPeriod);
/* setActiveConfigWithConstraints(...,
* config,
* vsyncPeriodChangeConstraints,
* outTimeline)
* Descriptor: HWC2_FUNCTION_SET_ACTIVE_CONFIG_WITH_CONSTRAINTS
* Required for HWC2 devices for composer 2.4
*
* Sets the active configuration and the refresh rate for this display.
* If the new config shares the same config group as the current config,
* only the vsync period shall change.
* Upon returning, the given display configuration, except vsync period, must be active and
* remain so until either this function is called again or the display is disconnected.
* When the display starts to refresh at the new vsync period, onVsync_2_4 callback must be
* called with the new vsync period.
*
* Parameters:
* config - the new display configuration.
* vsyncPeriodChangeConstraints - constraints required for changing vsync period:
* desiredTimeNanos - the time in CLOCK_MONOTONIC after
* which the vsync period may change
* (i.e., the vsync period must not change
* before this time).
* seamlessRequired - if true, requires that the vsync period
* change must happen seamlessly without
* a noticeable visual artifact.
* When the conditions change and it may be
* possible to change the vsync period
* seamlessly, HWC2_CALLBACK_SEAMLESS_POSSIBLE
* callback must be called to indicate that
* caller should retry.
* outTimeline - the timeline for the vsync period change.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in.
* HWC2_ERROR_BAD_CONFIG - an invalid configuration handle passed in.
* HWC2_ERROR_SEAMLESS_NOT_ALLOWED - when seamlessRequired was true but config provided doesn't
* share the same config group as the current config.
* HWC2_ERROR_SEAMLESS_NOT_POSSIBLE - when seamlessRequired was true but the display cannot
* achieve the vsync period change without a noticeable
* visual artifact.
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_SET_ACTIVE_CONFIG_WITH_CONSTRAINTS)(
hwc2_device_t* device, hwc2_display_t display, hwc2_config_t config,
hwc_vsync_period_change_constraints_t* vsyncPeriodChangeConstraints,
hwc_vsync_period_change_timeline_t* outTimeline);
/* setAutoLowLatencyMode(displayToken, on)
* Descriptor: HWC2_FUNCTION_SET_AUTO_LOW_LATENCY_MODE
* Optional for HWC2 devices
*
* setAutoLowLatencyMode requests that the display goes into low latency mode. If the display
* is connected via HDMI 2.1, then Auto Low Latency Mode should be triggered. If the display is
* internally connected, then a custom low latency mode should be triggered (if available).
*
* Parameters:
* on - indicates whether to turn low latency mode on (=true) or off (=false)
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - when the display is invalid, or
* HWC2_ERROR_UNSUPPORTED - when the display does not support any low latency mode
*/
typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_SET_AUTO_LOW_LATENCY_MODE)(hwc2_device_t* device,
hwc2_display_t display, bool on);
/* getSupportedContentTypes(..., outSupportedContentTypes)
* Descriptor: HWC2_FUNCTION_GET_SUPPORTED_CONTENT_TYPES
* Optional for HWC2 devices
*
* getSupportedContentTypes returns a list of supported content types
* (as described in the definition of ContentType above).
* This list must not change after initialization.
*
* Parameters:
* outNumSupportedContentTypes - if outSupportedContentTypes was nullptr, returns the number
* of supported content types; if outSupportedContentTypes was not nullptr, returns the
* number of capabilities stored in outSupportedContentTypes, which must not exceed the
* value stored in outNumSupportedContentTypes prior to the call; pointer will be non-NULL
* outSupportedContentTypes - a list of supported content types.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
*/
typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_GET_SUPPORTED_CONTENT_TYPES)(hwc2_device_t* device,
hwc2_display_t display, uint32_t* outNumSupportedContentTypes, uint32_t* outSupportedContentTypes);
/* setContentType(displayToken, contentType)
* Descriptor: HWC2_FUNCTION_SET_CONTENT_TYPE
* Optional for HWC2 devices
*
* setContentType instructs the display that the content being shown is of the given contentType
* (one of GRAPHICS, PHOTO, CINEMA, GAME).
*
* According to the HDMI 1.4 specification, supporting all content types is optional. Whether
* the display supports a given content type is reported by getSupportedContentTypes.
*
* Parameters:
* contentType - the type of content that is currently being shown on the display
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - when the display is invalid, or
* HWC2_ERROR_UNSUPPORTED - when the given content type is a valid content type, but is not
* supported on this display, or
* HWC2_ERROR_BAD_PARAMETER - when the given content type is invalid
*/
typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_SET_CONTENT_TYPE)(hwc2_device_t* device,
hwc2_display_t display, int32_t /* hwc2_content_type_t */ contentType);
/* getClientTargetProperty(..., outClientTargetProperty)
* Descriptor: HWC2_FUNCTION_GET_CLIENT_TARGET_PROPERTY
* Optional for HWC2 devices
*
* Retrieves the client target properties for which the hardware composer
* requests after the last call to validateDisplay. The client must set the
* properties of the client target to match the returned values.
* When this API is implemented, if client composition is needed, the hardware
* composer must return meaningful client target property with dataspace not
* setting to UNKNOWN.
* When the returned dataspace is set to UNKNOWN, it means hardware composer
* requests nothing, the client must ignore the returned client target property
* structrue.
*
* Parameters:
* outClientTargetProperty - the client target properties that hardware
* composer requests. If dataspace field is set to UNKNOWN, it means
* the hardware composer requests nothing, the client must ignore the
* returned client target property structure.
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_NOT_VALIDATED - validateDisplay has not been called for this
* display
*/
typedef int32_t /*hwc2_error_t*/ (*HWC2_PFN_GET_CLIENT_TARGET_PROPERTY)(
hwc2_device_t* device, hwc2_display_t display,
hwc_client_target_property_t* outClientTargetProperty);
/* setLayerGenericMetadata(..., keyLength, key, mandatory, valueLength, value)
* Descriptor: HWC2_FUNCTION_SET_LAYER_GENERIC_METADATA
* Optional for HWC2 devices for composer 2.4+
*
* setLayerGenericMetadata sets a piece of generic metadata for the given layer.
* If this function is called twice with the same key but different values, the
* newer value must override the older one. Calling this function with
* valueLength == 0 must reset that key's metadata as if it had not been set.
*
* A given piece of metadata may either be mandatory or a hint (non-mandatory)
* as indicated by the `mandatory` parameter. Mandatory metadata may affect the
* composition result, which is to say that it may cause a visible change in the
* final image. By contrast, hints may only affect the composition strategy,
* such as which layers are composited by the client, but must not cause a
* visible change in the final image.
*
* This implies that if the device does not understand a given key:
* - If the key is marked as mandatory, it must mark this layer for client
* composition in order to ensure the correct composition result
* - If the key is a hint, the metadata provided may be ignored
*
* Parameters:
* keyLength - the length of the key parameter
* key - the metadata key
* mandatory - indicates whether this particular key represents mandatory
* metadata or a hint, as described above
* valueLength - the length of the value parameter
* value - the metadata value
*
* Returns HWC2_ERROR_NONE or one of the following errors:
* HWC2_ERROR_BAD_DISPLAY - an invalid display handle was passed in
* HWC2_ERROR_BAD_LAYER - an invalid layer handle was passed in
* HWC2_ERROR_BAD_PARAMETER - an unsupported key was passed in, or the value
* does not conform to the expected format for the key
*/
typedef int32_t /*hwc_error_t*/ (*HWC2_PFN_SET_LAYER_GENERIC_METADATA)(hwc2_device_t* device,
hwc2_display_t display, hwc2_layer_t layer, uint32_t keyLength, const char* key,
bool mandatory, uint32_t valueLength, const uint8_t* value);
/* getLayerGenericMetadataKey(..., keyIndex, outKeyLength, outKey, outMandatory)
* Descriptor: HWC2_FUNCTION_GET_LAYER_GENERIC_METADATA_KEY
* Optional for HWC2 devices for composer 2.4+
*
* getLayerGenericMetadataKey allows the client to query which metadata keys are
* supported by the composer implementation. Only keys in this list will be
* passed into setLayerGenericMetadata. Additionally, the key names in this list
* must meet the following requirements:
* - Must be specified in reverse domain name notation
* - Must not start with 'com.android' or 'android'
* - Must be unique within the returned list of keys
* - Must correspond to a matching HIDL struct type, which defines the structure
* of its values. For example, the key 'com.example.V1-3.Foo' should
* correspond to a value of type com.example@1.3::Foo, which is defined in a
* vendor HAL extension
*
* Client code which calls this function will look similar to this:
*
* struct Key {
* std::string name;
* bool mandatory;
* }
*
* std::vector<Key> keys;
* uint32_t index = 0;
* uint32_t keyLength = 0;
* while (true) {
* getLayerGenericMetadataKey(device, index, &keyLength, nullptr, nullptr);
* if (keyLength == 0) break;
*
* Key key;
* key.name.resize(keyLength);
* getLayerGenericMetadataKey(device, index, &keyLength, key.name.data(), &key.mandatory);
* keys.push_back(key);
*
* ++index;
* }
*
* Parameters:
* keyIndex - the index of the key to retrieve. For values beyond the end of
* the list of supported keys, outKeyLength should return 0, and the
* client may assume that if the length is 0 for keyIndex N, then it is
* also 0 for all keyIndex values > N.
* outKeyLength - if outKey was nullptr, returns the length of the key to
* allow the client to allocate an appropriately-sized buffer; if outKey
* was not nullptr, returns the length of the returned key, which must not
* exceed the value stored in outKeyLength prior to the call; pointer will
* be non-null
* outKey - the key at the given index, or nullptr to query the key's length
* outMandatory - whether the given metadata is mandatory or not (see
* setLayerGenericMetadata for more information), may be nullptr
*/
typedef void (*HWC2_PFN_GET_LAYER_GENERIC_METADATA_KEY)(hwc2_device_t* device, uint32_t keyIndex,
uint32_t* outKeyLength, char* outKey, bool* outMandatory);
__END_DECLS
#endif
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