void
ContentHostIncremental::TextureCreationRequest::Execute(ContentHostIncremental* aHost)
{
Compositor* compositor = aHost->GetCompositor();
MOZ_ASSERT(compositor);
RefPtr<DataTextureSource> temp =
compositor->CreateDataTextureSource(mTextureInfo.mTextureFlags);
MOZ_ASSERT(temp->AsSourceOGL() &&
temp->AsSourceOGL()->AsTextureImageTextureSource());
RefPtr<TextureImageTextureSourceOGL> newSource =
temp->AsSourceOGL()->AsTextureImageTextureSource();
RefPtr<TextureImageTextureSourceOGL> newSourceOnWhite;
if (mTextureInfo.mTextureFlags & TextureFlags::COMPONENT_ALPHA) {
temp =
compositor->CreateDataTextureSource(mTextureInfo.mTextureFlags);
MOZ_ASSERT(temp->AsSourceOGL() &&
temp->AsSourceOGL()->AsTextureImageTextureSource());
newSourceOnWhite = temp->AsSourceOGL()->AsTextureImageTextureSource();
}
if (mTextureInfo.mDeprecatedTextureHostFlags & DeprecatedTextureHostFlags::COPY_PREVIOUS) {
MOZ_ASSERT(aHost->mSource);
MOZ_ASSERT(aHost->mSource->IsValid());
nsIntRect bufferRect = aHost->mBufferRect;
nsIntPoint bufferRotation = aHost->mBufferRotation;
nsIntRect overlap;
// The buffer looks like:
// ______
// |1 |2 | Where the center point is offset by mBufferRotation from the top-left corner.
// |___|__|
// |3 |4 |
// |___|__|
//
// This is drawn to the screen as:
// ______
// |4 |3 | Where the center point is { width - mBufferRotation.x, height - mBufferRotation.y } from
// |___|__| from the top left corner - rotationPoint.
// |2 |1 |
// |___|__|
//
// The basic idea below is to take all quadrant rectangles from the src and transform them into rectangles
// in the destination. Unfortunately, it seems it is overly complex and could perhaps be simplified.
nsIntRect srcBufferSpaceBottomRight(bufferRotation.x, bufferRotation.y, bufferRect.width - bufferRotation.x, bufferRect.height - bufferRotation.y);
nsIntRect srcBufferSpaceTopRight(bufferRotation.x, 0, bufferRect.width - bufferRotation.x, bufferRotation.y);
nsIntRect srcBufferSpaceTopLeft(0, 0, bufferRotation.x, bufferRotation.y);
nsIntRect srcBufferSpaceBottomLeft(0, bufferRotation.y, bufferRotation.x, bufferRect.height - bufferRotation.y);
overlap.IntersectRect(bufferRect, mBufferRect);
nsIntRect srcRect(overlap), dstRect(overlap);
srcRect.MoveBy(- bufferRect.TopLeft() + bufferRotation);
nsIntRect srcRectDrawTopRight(srcRect);
nsIntRect srcRectDrawTopLeft(srcRect);
nsIntRect srcRectDrawBottomLeft(srcRect);
// transform into the different quadrants
srcRectDrawTopRight .MoveBy(-nsIntPoint(0, bufferRect.height));
srcRectDrawTopLeft .MoveBy(-nsIntPoint(bufferRect.width, bufferRect.height));
srcRectDrawBottomLeft.MoveBy(-nsIntPoint(bufferRect.width, 0));
// Intersect with the quadrant
srcRect = srcRect .Intersect(srcBufferSpaceBottomRight);
srcRectDrawTopRight = srcRectDrawTopRight .Intersect(srcBufferSpaceTopRight);
srcRectDrawTopLeft = srcRectDrawTopLeft .Intersect(srcBufferSpaceTopLeft);
srcRectDrawBottomLeft = srcRectDrawBottomLeft.Intersect(srcBufferSpaceBottomLeft);
dstRect = srcRect;
nsIntRect dstRectDrawTopRight(srcRectDrawTopRight);
nsIntRect dstRectDrawTopLeft(srcRectDrawTopLeft);
nsIntRect dstRectDrawBottomLeft(srcRectDrawBottomLeft);
// transform back to src buffer space
dstRect .MoveBy(-bufferRotation);
dstRectDrawTopRight .MoveBy(-bufferRotation + nsIntPoint(0, bufferRect.height));
dstRectDrawTopLeft .MoveBy(-bufferRotation + nsIntPoint(bufferRect.width, bufferRect.height));
dstRectDrawBottomLeft.MoveBy(-bufferRotation + nsIntPoint(bufferRect.width, 0));
// transform back to draw coordinates
dstRect .MoveBy(bufferRect.TopLeft());
dstRectDrawTopRight .MoveBy(bufferRect.TopLeft());
dstRectDrawTopLeft .MoveBy(bufferRect.TopLeft());
dstRectDrawBottomLeft.MoveBy(bufferRect.TopLeft());
// transform to destBuffer space
dstRect .MoveBy(-mBufferRect.TopLeft());
dstRectDrawTopRight .MoveBy(-mBufferRect.TopLeft());
dstRectDrawTopLeft .MoveBy(-mBufferRect.TopLeft());
dstRectDrawBottomLeft.MoveBy(-mBufferRect.TopLeft());
newSource->EnsureBuffer(mBufferRect.Size(),
ContentForFormat(aHost->mSource->GetFormat()));
aHost->mSource->CopyTo(srcRect, newSource, dstRect);
if (bufferRotation != nsIntPoint(0, 0)) {
// Draw the remaining quadrants. We call BlitTextureImage 3 extra
// times instead of doing a single draw call because supporting that
// with a tiled source is quite tricky.
if (!srcRectDrawTopRight.IsEmpty())
aHost->mSource->CopyTo(srcRectDrawTopRight,
newSource, dstRectDrawTopRight);
if (!srcRectDrawTopLeft.IsEmpty())
aHost->mSource->CopyTo(srcRectDrawTopLeft,
newSource, dstRectDrawTopLeft);
if (!srcRectDrawBottomLeft.IsEmpty())
aHost->mSource->CopyTo(srcRectDrawBottomLeft,
newSource, dstRectDrawBottomLeft);
}
if (newSourceOnWhite) {
newSourceOnWhite->EnsureBuffer(mBufferRect.Size(),
ContentForFormat(aHost->mSourceOnWhite->GetFormat()));
aHost->mSourceOnWhite->CopyTo(srcRect, newSourceOnWhite, dstRect);
if (bufferRotation != nsIntPoint(0, 0)) {
// draw the remaining quadrants
if (!srcRectDrawTopRight.IsEmpty())
aHost->mSourceOnWhite->CopyTo(srcRectDrawTopRight,
newSourceOnWhite, dstRectDrawTopRight);
if (!srcRectDrawTopLeft.IsEmpty())
aHost->mSourceOnWhite->CopyTo(srcRectDrawTopLeft,
newSourceOnWhite, dstRectDrawTopLeft);
if (!srcRectDrawBottomLeft.IsEmpty())
aHost->mSourceOnWhite->CopyTo(srcRectDrawBottomLeft,
newSourceOnWhite, dstRectDrawBottomLeft);
}
}
}
aHost->mSource = newSource;
aHost->mSourceOnWhite = newSourceOnWhite;
aHost->mBufferRect = mBufferRect;
aHost->mBufferRotation = nsIntPoint();
}
