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libhwcomposer: Skip composition if there is no UI update

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If we have only one overlay layer, and the rest of the layers
are not updating, set the HWC_SKIP_COMPOSITION flag to inform
SurfaceFlinger not to compose anything. Also skip the drawing of
any UI frames and swapping the buffers.

Change-Id: I2f6554c905756a08880cba531c0210a58396179b
CRs-fixed: 289477
This commit is contained in:
Naomi Luis 2011-06-07 11:59:40 -07:00 committed by Govind Surti
parent d739bf81ce
commit 07e8ae7fe4
1 changed files with 33 additions and 10 deletions
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43
libhwcomposer/hwcomposer.cpp
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@ -71,6 +71,7 @@ struct hwc_context_t {
hwc_composer_device_t device;
/* our private state goes below here */
overlay::Overlay* mOverlayLibObject;
int previousLayerCount;
};
static int hwc_device_open(const struct hw_module_t* module, const char* name,
@ -198,7 +199,8 @@ static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
int yuvBufferCount = 0;
int layerType = 0;
if (list && (list->flags & HWC_GEOMETRY_CHANGED)) {
int numLayersNotUpdating = 0;
if (list) {
for (size_t i=0 ; i<list->numHwLayers; i++) {
private_handle_t *hnd = (private_handle_t *)list->hwLayers[i].handle;
if(hnd && (hnd->bufferType == BUFFER_TYPE_VIDEO)) {
@ -206,6 +208,8 @@ static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
if (yuvBufferCount > 1) {
break;
}
} else if (list->hwLayers[i].flags & HWC_LAYER_NOT_UPDATING) {
numLayersNotUpdating++;
}
}
@ -227,9 +231,23 @@ static int hwc_prepare(hwc_composer_device_t *dev, hwc_layer_list_t* list) {
}
}
layerType |= (yuvBufferCount == 1) ? HWC_SINGLE_VIDEO: 0;
// Inform the gralloc of the current HDMI status
hwc_updateOverlayStatus(ctx, layerType);
bool compCountChanged = false;
if (list->numHwLayers != ctx->previousLayerCount) {
compCountChanged = true;
ctx->previousLayerCount = list->numHwLayers;
}
if ((yuvBufferCount == 1) && ((list->numHwLayers-1) == numLayersNotUpdating)
&& !compCountChanged) {
list->flags |= HWC_SKIP_COMPOSITION;
} else {
list->flags &= ~HWC_SKIP_COMPOSITION;
}
if (list->flags & HWC_GEOMETRY_CHANGED) {
layerType |= (yuvBufferCount == 1) ? HWC_SINGLE_VIDEO: 0;
// Inform the gralloc of the current HDMI status
hwc_updateOverlayStatus(ctx, layerType);
}
}
return 0;
@ -448,22 +466,27 @@ static int hwc_set(hwc_composer_device_t *dev,
LOGE("hwc_set null module ");
return -1;
}
for (size_t i=0 ; i<list->numHwLayers ; i++) {
for (size_t i=0; i<list->numHwLayers; i++) {
if (list->hwLayers[i].flags == HWC_SKIP_LAYER) {
continue;
}
if (list->hwLayers[i].compositionType == HWC_USE_OVERLAY) {
drawLayerUsingOverlay(ctx, &(list->hwLayers[i]));
} else if (list->flags & HWC_SKIP_COMPOSITION) {
break;
} else if (list->hwLayers[i].compositionType == HWC_USE_COPYBIT) {
drawLayerUsingCopybit(dev, &(list->hwLayers[i]), (EGLDisplay)dpy, (EGLSurface)sur);
drawLayerUsingCopybit(dev, &(list->hwLayers[i]), (EGLDisplay)dpy, (EGLSurface)sur);
}
}
EGLBoolean sucess = eglSwapBuffers((EGLDisplay)dpy, (EGLSurface)sur);
if (!sucess) {
return HWC_EGL_ERROR;
}
// Do not call eglSwapBuffers if we the skip composition flag is set on the list.
if (!(list->flags & HWC_SKIP_COMPOSITION)) {
EGLBoolean sucess = eglSwapBuffers((EGLDisplay)dpy, (EGLSurface)sur);
if (!sucess) {
return HWC_EGL_ERROR;
}
}
return 0;
}