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Bug 984500 - Add general description of HwcComposer2D. r=sotaro

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This commit is contained in:
Diego Wilson 2014-03-18 07:53:09 -07:00
parent bae45ed494
commit c50e5b3ca4
1 changed files with 17 additions and 0 deletions
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17
widget/gonk/HwcComposer2D.h
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@ -47,6 +47,23 @@ typedef hwc_layer_list_t HwcList;
typedef hwc_layer_t HwcLayer;
#endif
/*
* HwcComposer2D provides a way for gecko to render frames
* using hwcomposer.h in the AOSP HAL.
*
* hwcomposer.h defines an interface for display composition
* using dedicated hardware. This hardware is usually faster
* or more power efficient than the GPU. However, in exchange
* for better performance, generality has to be sacrificed:
* no 3d transforms, no intermediate surfaces, no special shader effects,
* and loss of other goodies depending on the platform.
*
* In general, when hwc is enabled gecko tries to compose
* its frames using HwcComposer2D first. Then if HwcComposer2D is
* unable to compose a frame then it falls back to compose it
* using the GPU with OpenGL.
*
*/
class HwcComposer2D : public mozilla::layers::Composer2D {
public:
HwcComposer2D();