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libhwcomposer: Move the skip composition logic to a separate API

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Create a new function to check if we need to skip the composition
during overlay operations.
Reset the previous compCount variable if there is no video layer present.

Change-Id: Ibf570805114440f117f0fb98b5f2d53c1780ec84
CRs-fixed: 298014
This commit is contained in:
Naomi Luis 2011-07-29 10:59:33 -07:00 committed by Govind Surti
parent f75b90721f
commit 61390825ec
1 changed files with 31 additions and 7 deletions
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38
libhwcomposer/hwcomposer.cpp
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@ -272,6 +272,36 @@ static int prepareOverlay(hwc_context_t *ctx, hwc_layer_t *layer) {
return 0;
}
bool canSkipComposition(hwc_context_t* ctx, int yuvBufferCount, int currentLayerCount,
int numLayersNotUpdating)
{
if (!ctx) {
LOGE("canSkipComposition invalid context");
return false;
}
bool compCountChanged = false;
if (yuvBufferCount == 1) {
if (currentLayerCount != ctx->previousLayerCount) {
compCountChanged = true;
ctx->previousLayerCount = currentLayerCount;
}
if (!compCountChanged) {
if ((currentLayerCount == 1) ||
((currentLayerCount-1) == numLayersNotUpdating)) {
// We either have only one overlay layer or we have
// all the non-UI layers not updating. In this case
// we can skip the composition of the UI layers.
return true;
}
}
} else {
ctx->previousLayerCount = -1;
}
return false;
}
static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
hwc_context_t* ctx = (hwc_context_t*)(dev);
@ -335,13 +365,7 @@ static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
}
}
bool compCountChanged = false;
if (list->numHwLayers != ctx->previousLayerCount) {
compCountChanged = true;
ctx->previousLayerCount = list->numHwLayers;
}
if ((yuvBufferCount == 1) && ((list->numHwLayers-1) == numLayersNotUpdating)
&& !compCountChanged) {
if (canSkipComposition(ctx, yuvBufferCount, list->numHwLayers, numLayersNotUpdating)) {
list->flags |= HWC_SKIP_COMPOSITION;
} else {
list->flags &= ~HWC_SKIP_COMPOSITION;