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libhwcomposer: Disable FB fetch if there is only one video layer.

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If we have a single layer for composition which goes via the overlay,
we can disable disable the framebuffer fetch thereby saving power.

CRs-Fixed: 338777
(cherry picked from commit c40d887d714d14182e867e5eb7942160b3feb197)

Change-Id: I361f5d8a60fb478a675b47163b7524c79e66624a
This commit is contained in:
Naomi Luis 2012-01-26 10:20:38 -08:00 committed by Andrew Sutherland
parent d98b6e5171
commit 6dd7f17b59
1 changed files with 5 additions and 4 deletions
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9
libhwcomposer/hwcomposer.cpp
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@ -587,7 +587,7 @@ static int hwc_closeOverlayChannels(hwc_context_t* ctx) {
/*
* Configures mdp pipes
*/
static int prepareOverlay(hwc_context_t *ctx, hwc_layer_t *layer, const bool waitForVsync) {
static int prepareOverlay(hwc_context_t *ctx, hwc_layer_t *layer, const int flags) {
int ret = 0;
#ifdef COMPOSITION_BYPASS
@ -623,7 +623,7 @@ static int prepareOverlay(hwc_context_t *ctx, hwc_layer_t *layer, const bool wai
hdmiConnected = (int)ctx->mHDMIEnabled;
#endif
ret = ovLibObject->setSource(info, layer->transform,
hdmiConnected, waitForVsync);
hdmiConnected, flags);
if (!ret) {
LOGE("prepareOverlay setSource failed");
return -1;
@ -1021,11 +1021,12 @@ static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
continue;
}
if (hnd && (hnd->bufferType == BUFFER_TYPE_VIDEO) && (yuvBufferCount == 1)) {
bool waitForVsync = true;
int flags = WAIT_FOR_VSYNC;
flags |= (1 == list->numHwLayers) ? DISABLE_FRAMEBUFFER_FETCH : 0;
if (!isValidDestination(hwcModule->fbDevice, list->hwLayers[i].displayFrame)) {
list->hwLayers[i].compositionType = HWC_FRAMEBUFFER;
#ifdef USE_OVERLAY
} else if(prepareOverlay(ctx, &(list->hwLayers[i]), waitForVsync) == 0) {
} else if(prepareOverlay(ctx, &(list->hwLayers[i]), flags) == 0) {
list->hwLayers[i].compositionType = HWC_USE_OVERLAY;
list->hwLayers[i].hints |= HWC_HINT_CLEAR_FB;
// We've opened the channel. Set the state to open.