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Treat composition frames with no layers as using GLES composition

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When there are no window layers for a display, SurfaceFlinger clears
the undefined region using GLES. Some of the places that check for
GLES composition weren't considering this special case, in particular:

- We were skipping the eglSwapBuffers() on these frames.
- We were putting VirtualDisplaySurface in HWC-only composition mode.

This change centralizes the logic for this special case.

Bug: 10957068
Change-Id: I2deaf2ed101e8ea76708862a6bb67751b6078794
This commit is contained in:
Jesse Hall 2013-09-30 16:49:30 -07:00
parent 86206b41b2
commit d05a17fbb3
2 changed files with 10 additions and 1 deletions
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9
services/surfaceflinger/DisplayHardware/HWComposer.cpp
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@ -611,6 +611,10 @@ status_t HWComposer::prepare() {
// here we're just making sure that "skip" layers are set
// to HWC_FRAMEBUFFER and we're also counting how many layers
// we have of each type.
//
// If there are no window layers, we treat the display has having FB
// composition, because SurfaceFlinger will use GLES to draw the
// wormhole region.
for (size_t i=0 ; i<mNumDisplays ; i++) {
DisplayData& disp(mDisplayData[i]);
disp.hasFbComp = false;
@ -632,6 +636,11 @@ status_t HWComposer::prepare() {
disp.hasOvComp = true;
}
}
if (disp.list->numHwLayers == (disp.framebufferTarget ? 1 : 0)) {
disp.hasFbComp = true;
}
} else {
disp.hasFbComp = true;
}
}
}

2
services/surfaceflinger/SurfaceFlinger.cpp
View File

@ -1527,7 +1527,7 @@ void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const
HWComposer::LayerListIterator cur = hwc.begin(id);
const HWComposer::LayerListIterator end = hwc.end(id);
const bool hasGlesComposition = hwc.hasGlesComposition(id) || (cur==end);
bool hasGlesComposition = hwc.hasGlesComposition(id);
if (hasGlesComposition) {
if (!hw->makeCurrent(mEGLDisplay, mEGLContext)) {
ALOGW("DisplayDevice::makeCurrent failed. Aborting surface composition for display %s",