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graphics: add Android flexible YCbCr format

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Change-Id: I3f6676873febc793f7a4a5e06892cd9fadb35665
This commit is contained in:
Alex Ray 2013-03-19 01:41:32 -07:00
parent 7716aef138
commit e13f15ab55
1 changed files with 54 additions and 0 deletions
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54
include/system/graphics.h
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@ -17,6 +17,8 @@
#ifndef SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
#define SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
@ -188,12 +190,64 @@ enum {
*/
HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED = 0x22,
/*
* Android flexible YCbCr formats
*
* This format allows platforms to use an efficient YCbCr/YCrCb buffer
* layout, while still describing the buffer layout in a way accessible to
* the CPU in a device-independent manner. While called YCbCr, it can be
* used to describe formats with either chromatic ordering, as well as
* whole planar or semiplanar layouts.
*
* struct android_ycbcr (below) is the the struct used to describe it.
*
* This format must be accepted by the gralloc module when
* USAGE_HW_CAMERA_WRITE and USAGE_SW_READ_* are set.
*
* This format is locked for use by gralloc's (*lock_ycbcr) method, and
* locking with the (*lock) method will return an error.
*/
HAL_PIXEL_FORMAT_YCbCr_420_888 = 0x23,
/* Legacy formats (deprecated), used by ImageFormat.java */
HAL_PIXEL_FORMAT_YCbCr_422_SP = 0x10, // NV16
HAL_PIXEL_FORMAT_YCrCb_420_SP = 0x11, // NV21
HAL_PIXEL_FORMAT_YCbCr_422_I = 0x14, // YUY2
};
/*
* Structure for describing YCbCr formats for consumption by applications.
* This is used with HAL_PIXEL_FORMAT_YCbCr_*_888.
*
* Buffer chroma subsampling is defined in the format.
* e.g. HAL_PIXEL_FORMAT_YCbCr_420_888 has subsampling 4:2:0.
*
* Buffers must have a 8 bit depth.
*
* @y, @cb, and @cr point to the first byte of their respective planes.
*
* Stride describes the distance in bytes from the first value of one row of
* the image to the first value of the next row. It includes the width of the
* image plus padding.
* @ystride is the stride of the luma plane.
* @cstride is the stride of the chroma planes.
*
* @chroma_step is the distance in bytes from one chroma pixel value to the
* next. This is 2 bytes for semiplanar (because chroma values are interleaved
* and each chroma value is one byte) and 1 for planar.
*/
struct android_ycbcr {
void *y;
void *cb;
void *cr;
size_t ystride;
size_t cstride;
size_t chroma_step;
/** reserved for future use, set to 0 by gralloc's (*lock_ycbcr)() */
uint32_t reserved[8];
};
/**
* Transformation definitions