void
BasicShadowCanvasLayer::Swap(const CanvasSurface& aNewFront, bool needYFlip,
CanvasSurface* aNewBack)
{
AutoOpenSurface autoSurface(OPEN_READ_ONLY, aNewFront);
// Destroy mFrontBuffer if size different
gfxIntSize sz = autoSurface.Size();
bool surfaceConfigChanged = sz != gfxIntSize(mBounds.width, mBounds.height);
if (IsSurfaceDescriptorValid(mFrontSurface)) {
AutoOpenSurface autoFront(OPEN_READ_ONLY, mFrontSurface);
surfaceConfigChanged = surfaceConfigChanged ||
autoSurface.ContentType() != autoFront.ContentType();
}
if (surfaceConfigChanged) {
DestroyFrontBuffer();
mBounds.SetRect(0, 0, sz.width, sz.height);
}
mNeedsYFlip = needYFlip;
// If mFrontBuffer
if (IsSurfaceDescriptorValid(mFrontSurface)) {
*aNewBack = mFrontSurface;
} else {
*aNewBack = null_t();
}
mFrontSurface = aNewFront;
}
void
TileClient::ValidateBackBufferFromFront(const nsIntRegion& aDirtyRegion,
bool aCanRerasterizeValidRegion)
{
if (mBackBuffer && mFrontBuffer) {
const nsIntRect tileRect = nsIntRect(0, 0, TILEDLAYERBUFFER_TILE_SIZE, TILEDLAYERBUFFER_TILE_SIZE);
if (aDirtyRegion.Contains(tileRect)) {
// The dirty region means that we no longer need the front buffer, so
// discard it.
DiscardFrontBuffer();
} else {
// Region that needs copying.
nsIntRegion regionToCopy = mInvalidBack;
regionToCopy.Sub(regionToCopy, aDirtyRegion);
if (regionToCopy.IsEmpty() ||
(aCanRerasterizeValidRegion &&
regionToCopy.Area() < MINIMUM_TILE_COPY_AREA)) {
// Just redraw it all.
return;
}
if (!mFrontBuffer->Lock(OPEN_READ)) {
NS_WARNING("Failed to lock the tile's front buffer");
return;
}
TextureClientAutoUnlock autoFront(mFrontBuffer);
if (!mBackBuffer->Lock(OPEN_WRITE)) {
NS_WARNING("Failed to lock the tile's back buffer");
return;
}
TextureClientAutoUnlock autoBack(mBackBuffer);
// Copy the bounding rect of regionToCopy. As tiles are quite small, it
// is unlikely that we'd save much by copying each individual rect of the
// region, but we can reevaluate this if it becomes an issue.
const nsIntRect rectToCopy = regionToCopy.GetBounds();
gfx::IntRect gfxRectToCopy(rectToCopy.x, rectToCopy.y, rectToCopy.width, rectToCopy.height);
gfx::IntPoint gfxRectToCopyTopLeft = gfxRectToCopy.TopLeft();
mFrontBuffer->CopyToTextureClient(mBackBuffer, &gfxRectToCopy, &gfxRectToCopyTopLeft);
mInvalidBack.SetEmpty();
}
}
}
