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libhwcomposer: Change dynamic composition strategy

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Use copybit composition only for those frames where we
have maximum 2 full screen sized layers for composition.

Change-Id: Id34975f85dce11ba9365714655c994c6f3b0cabd
(cherry picked from commit 2f2c75f3c8d6700dcf981f980e817c813ed3e389)
This commit is contained in:
Jeykumar Sankaran 2012-03-02 20:26:22 -08:00 committed by Andrew Sutherland
parent dc22c8ffb5
commit 43afc2743e
1 changed files with 8 additions and 20 deletions
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28
libhwcomposer/hwcomposer.cpp
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@ -766,31 +766,19 @@ static bool canUseCopybit(const framebuffer_device_t* fbDev, const hwc_layer_lis
int fb_h = fbDev->height;
/*
* We can use copybit when
* 1. We have 1 layer to compose
* 2. We have 2 layers to compose
* a. Sum of both layers covers full screen
* b. One of the layers is full screen and the
* other is less than full screen (includes
* pop ups, volume bar etc.)
* TODO: Need to revisit this logic to use copybit
* based on the total blitting region instead of total
* layers count
* Use copybit only when we need to blit
* max 2 full screen sized regions
*/
bool use_copybit = (list->numHwLayers == 1);
unsigned int renderArea = 0;
if(list->numHwLayers == 2) {
int w1, h1;
int w2, h2;
getLayerResolution(&list->hwLayers[0], w1, h1);
getLayerResolution(&list->hwLayers[1], w2, h2);
use_copybit = ((fb_w >= w1) && (fb_w >= w2) && ((fb_h * 2) > (h1 + h2)));
for(int i = 0; i < list->numHwLayers; i++ ) {
int w, h;
getLayerResolution(&list->hwLayers[i], w, h);
renderArea += w*h;
}
return use_copybit;
return (renderArea <= (2 * fb_w * fb_h));
}
static void handleHDMIStateChange(hwc_composer_device_t *dev, int externaltype) {