tequilaOS/platform_hardware_libhardware
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

add support for plane-alpha in HWC

Browse source 
Change-Id: Ied228e689ca892c505fbd811fd2b8579287e4ac6
This commit is contained in:
Mathias Agopian 2013-01-29 18:57:48 -08:00
parent efa40942bf
commit e3e0a570a8
1 changed files with 41 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

42
include/hardware/hwcomposer.h
View file

@ -202,13 +202,53 @@ typedef struct hwc_layer_1 {
* responsible for closing it when no longer needed.
*/
int releaseFenceFd;
/*
* Availability: HWC_DEVICE_API_VERSION_1_2
*
* Alpha value applied to the whole layer. The effective
* value of each pixel is computed as:
*
* if (blending == HWC_BLENDING_PREMULT)
* pixel.rgb = pixel.rgb * planeAlpha / 255
* pixel.a = pixel.a * planeAlpha / 255
*
* Then blending proceeds as usual according to the "blending"
* field above.
*
* NOTE: planeAlpha applies to YUV layers as well:
*
* pixel.rgb = yuv_to_rgb(pixel.yuv)
* if (blending == HWC_BLENDING_PREMULT)
* pixel.rgb = pixel.rgb * planeAlpha / 255
* pixel.a = planeAlpha
*
*
* IMPLEMENTATION NOTE:
*
* If the source image doesn't have an alpha channel, then
* the h/w can use the HWC_BLENDING_COVERAGE equations instead of
* HWC_BLENDING_PREMULT and simply set the alpha channel to
* planeAlpha.
*
* e.g.:
*
* if (blending == HWC_BLENDING_PREMULT)
* blending = HWC_BLENDING_COVERAGE;
* pixel.a = planeAlpha;
*
*/
uint8_t planeAlpha;
/* reserved for future use */
uint8_t _pad[3];
};
};
/* Allow for expansion w/o breaking binary compatibility.
* Pad layer to 96 bytes, assuming 32-bit pointers.
*/
int32_t reserved[24 - 18];
int32_t reserved[24 - 19];
} hwc_layer_1_t;