304 lines
10 KiB
C
304 lines
10 KiB
C
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
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#define SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* If the HAL needs to create service threads to handle graphics related
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* tasks, these threads need to run at HAL_PRIORITY_URGENT_DISPLAY priority
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* if they can block the main rendering thread in any way.
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*
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* the priority of the current thread can be set with:
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*
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* #include <sys/resource.h>
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* setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
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*
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*/
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#define HAL_PRIORITY_URGENT_DISPLAY (-8)
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/**
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* pixel format definitions
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*/
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enum {
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/*
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* "linear" color pixel formats:
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*
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* The pixel formats below contain sRGB data but are otherwise treated
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* as linear formats, i.e.: no special operation is performed when
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* reading or writing into a buffer in one of these formats
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*/
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HAL_PIXEL_FORMAT_RGBA_8888 = 1,
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HAL_PIXEL_FORMAT_RGBX_8888 = 2,
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HAL_PIXEL_FORMAT_RGB_888 = 3,
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HAL_PIXEL_FORMAT_RGB_565 = 4,
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HAL_PIXEL_FORMAT_BGRA_8888 = 5,
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/*
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* sRGB color pixel formats:
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*
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* The red, green and blue components are stored in sRGB space, and converted
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* to linear space when read, using the standard sRGB to linear equation:
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*
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* Clinear = Csrgb / 12.92 for Csrgb <= 0.04045
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* = (Csrgb + 0.055 / 1.055)^2.4 for Csrgb > 0.04045
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*
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* When written the inverse transformation is performed:
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*
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* Csrgb = 12.92 * Clinear for Clinear <= 0.0031308
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* = 1.055 * Clinear^(1/2.4) - 0.055 for Clinear > 0.0031308
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*
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*
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* The alpha component, if present, is always stored in linear space and
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* is left unmodified when read or written.
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*
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*/
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HAL_PIXEL_FORMAT_sRGB_A_8888 = 0xC,
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HAL_PIXEL_FORMAT_sRGB_X_8888 = 0xD,
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/*
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* 0x100 - 0x1FF
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*
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* This range is reserved for pixel formats that are specific to the HAL
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* implementation. Implementations can use any value in this range to
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* communicate video pixel formats between their HAL modules. These formats
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* must not have an alpha channel. Additionally, an EGLimage created from a
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* gralloc buffer of one of these formats must be supported for use with the
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* GL_OES_EGL_image_external OpenGL ES extension.
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*/
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/*
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* Android YUV format:
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*
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* This format is exposed outside of the HAL to software decoders and
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* applications. EGLImageKHR must support it in conjunction with the
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* OES_EGL_image_external extension.
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*
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* YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
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* by (W/2) x (H/2) Cr and Cb planes.
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*
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* This format assumes
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* - an even width
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* - an even height
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* - a horizontal stride multiple of 16 pixels
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* - a vertical stride equal to the height
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*
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* y_size = stride * height
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* c_stride = ALIGN(stride/2, 16)
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* c_size = c_stride * height/2
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* size = y_size + c_size * 2
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* cr_offset = y_size
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* cb_offset = y_size + c_size
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*
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*/
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HAL_PIXEL_FORMAT_YV12 = 0x32315659, // YCrCb 4:2:0 Planar
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/*
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* Android Y8 format:
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*
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* This format is exposed outside of the HAL to the framework.
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* The expected gralloc usage flags are SW_* and HW_CAMERA_*,
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* and no other HW_ flags will be used.
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*
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* Y8 is a YUV planar format comprised of a WxH Y plane,
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* with each pixel being represented by 8 bits.
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*
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* It is equivalent to just the Y plane from YV12.
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*
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* This format assumes
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* - an even width
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* - an even height
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* - a horizontal stride multiple of 16 pixels
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* - a vertical stride equal to the height
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*
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* size = stride * height
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*
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*/
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HAL_PIXEL_FORMAT_Y8 = 0x20203859,
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/*
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* Android Y16 format:
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*
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* This format is exposed outside of the HAL to the framework.
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* The expected gralloc usage flags are SW_* and HW_CAMERA_*,
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* and no other HW_ flags will be used.
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*
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* Y16 is a YUV planar format comprised of a WxH Y plane,
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* with each pixel being represented by 16 bits.
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*
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* It is just like Y8, but has double the bits per pixel (little endian).
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*
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* This format assumes
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* - an even width
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* - an even height
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* - a horizontal stride multiple of 16 pixels
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* - a vertical stride equal to the height
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* - strides are specified in pixels, not in bytes
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*
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* size = stride * height * 2
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*
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*/
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HAL_PIXEL_FORMAT_Y16 = 0x20363159,
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/*
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* Android RAW sensor format:
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*
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* This format is exposed outside of the HAL to applications.
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*
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* RAW_SENSOR is a single-channel 16-bit format, typically representing raw
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* Bayer-pattern images from an image sensor, with minimal processing.
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*
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* The exact pixel layout of the data in the buffer is sensor-dependent, and
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* needs to be queried from the camera device.
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*
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* Generally, not all 16 bits are used; more common values are 10 or 12
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* bits. All parameters to interpret the raw data (black and white points,
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* color space, etc) must be queried from the camera device.
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*
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* This format assumes
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* - an even width
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* - an even height
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* - a horizontal stride multiple of 16 pixels (32 bytes).
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*/
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HAL_PIXEL_FORMAT_RAW_SENSOR = 0x20,
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/*
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* Android binary blob graphics buffer format:
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*
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* This format is used to carry task-specific data which does not have a
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* standard image structure. The details of the format are left to the two
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* endpoints.
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*
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* A typical use case is for transporting JPEG-compressed images from the
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* Camera HAL to the framework or to applications.
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*
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* Buffers of this format must have a height of 1, and width equal to their
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* size in bytes.
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*/
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HAL_PIXEL_FORMAT_BLOB = 0x21,
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/*
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* Android format indicating that the choice of format is entirely up to the
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* device-specific Gralloc implementation.
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*
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* The Gralloc implementation should examine the usage bits passed in when
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* allocating a buffer with this format, and it should derive the pixel
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* format from those usage flags. This format will never be used with any
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* of the GRALLOC_USAGE_SW_* usage flags.
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*
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* If a buffer of this format is to be used as an OpenGL ES texture, the
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* framework will assume that sampling the texture will always return an
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* alpha value of 1.0 (i.e. the buffer contains only opaque pixel values).
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*
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*/
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HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED = 0x22,
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/*
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* Android flexible YCbCr formats
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*
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* This format allows platforms to use an efficient YCbCr/YCrCb buffer
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* layout, while still describing the buffer layout in a way accessible to
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* the CPU in a device-independent manner. While called YCbCr, it can be
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* used to describe formats with either chromatic ordering, as well as
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* whole planar or semiplanar layouts.
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*
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* struct android_ycbcr (below) is the the struct used to describe it.
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*
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* This format must be accepted by the gralloc module when
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* USAGE_HW_CAMERA_WRITE and USAGE_SW_READ_* are set.
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*
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* This format is locked for use by gralloc's (*lock_ycbcr) method, and
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* locking with the (*lock) method will return an error.
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*/
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HAL_PIXEL_FORMAT_YCbCr_420_888 = 0x23,
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/* Legacy formats (deprecated), used by ImageFormat.java */
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HAL_PIXEL_FORMAT_YCbCr_422_SP = 0x10, // NV16
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HAL_PIXEL_FORMAT_YCrCb_420_SP = 0x11, // NV21
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HAL_PIXEL_FORMAT_YCbCr_422_I = 0x14, // YUY2
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};
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/*
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* Structure for describing YCbCr formats for consumption by applications.
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* This is used with HAL_PIXEL_FORMAT_YCbCr_*_888.
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*
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* Buffer chroma subsampling is defined in the format.
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* e.g. HAL_PIXEL_FORMAT_YCbCr_420_888 has subsampling 4:2:0.
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*
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* Buffers must have a 8 bit depth.
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*
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* @y, @cb, and @cr point to the first byte of their respective planes.
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*
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* Stride describes the distance in bytes from the first value of one row of
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* the image to the first value of the next row. It includes the width of the
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* image plus padding.
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* @ystride is the stride of the luma plane.
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* @cstride is the stride of the chroma planes.
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*
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* @chroma_step is the distance in bytes from one chroma pixel value to the
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* next. This is 2 bytes for semiplanar (because chroma values are interleaved
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* and each chroma value is one byte) and 1 for planar.
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*/
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struct android_ycbcr {
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void *y;
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void *cb;
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void *cr;
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size_t ystride;
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size_t cstride;
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size_t chroma_step;
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/** reserved for future use, set to 0 by gralloc's (*lock_ycbcr)() */
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uint32_t reserved[8];
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};
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/**
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* Transformation definitions
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*
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* IMPORTANT NOTE:
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* HAL_TRANSFORM_ROT_90 is applied CLOCKWISE and AFTER HAL_TRANSFORM_FLIP_{H|V}.
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*
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*/
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enum {
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/* flip source image horizontally (around the vertical axis) */
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HAL_TRANSFORM_FLIP_H = 0x01,
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/* flip source image vertically (around the horizontal axis)*/
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HAL_TRANSFORM_FLIP_V = 0x02,
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/* rotate source image 90 degrees clockwise */
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HAL_TRANSFORM_ROT_90 = 0x04,
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/* rotate source image 180 degrees */
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HAL_TRANSFORM_ROT_180 = 0x03,
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/* rotate source image 270 degrees clockwise */
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HAL_TRANSFORM_ROT_270 = 0x07,
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/* don't use. see system/window.h */
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HAL_TRANSFORM_RESERVED = 0x08,
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H */
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