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Bug 717393 - Part 5: Permit subpixel AA for transparent surfaces. r=roc

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This commit is contained in:
Bas Schouten
2012-05-15 16:57:51 +02:00
parent cdd664e722
commit 82b1169afc
3 changed files with 42 additions and 18 deletions
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38
gfx/layers/basic/BasicLayers.cpp
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@@ -599,21 +599,33 @@ static void
SetAntialiasingFlags(Layer* aLayer, gfxContext* aTarget)
{
if (!aTarget->IsCairo()) {
// Azure targets don't contain antialiasing flags at this point.
return;
}
RefPtr<DrawTarget> dt = aTarget->GetDrawTarget();
nsRefPtr<gfxASurface> surface = aTarget->CurrentSurface();
if (surface->GetContentType() != gfxASurface::CONTENT_COLOR_ALPHA) {
// Destination doesn't have alpha channel; no need to set any special flags
return;
}
if (dt->GetFormat() != FORMAT_B8G8R8A8) {
return;
}
const nsIntRect& bounds = aLayer->GetVisibleRegion().GetBounds();
surface->SetSubpixelAntialiasingEnabled(
!(aLayer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA) ||
surface->GetOpaqueRect().Contains(
aTarget->UserToDevice(gfxRect(bounds.x, bounds.y, bounds.width, bounds.height))));
const nsIntRect& bounds = aLayer->GetVisibleRegion().GetBounds();
Rect transformedBounds = dt->GetTransform().TransformBounds(Rect(Float(bounds.x), Float(bounds.y),
Float(bounds.width), Float(bounds.height)));
transformedBounds.RoundOut();
IntRect intTransformedBounds;
transformedBounds.ToIntRect(&intTransformedBounds);
dt->SetPermitSubpixelAA(!(aLayer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA) ||
dt->GetOpaqueRect().Contains(intTransformedBounds));
} else {
nsRefPtr<gfxASurface> surface = aTarget->CurrentSurface();
if (surface->GetContentType() != gfxASurface::CONTENT_COLOR_ALPHA) {
// Destination doesn't have alpha channel; no need to set any special flags
return;
}
const nsIntRect& bounds = aLayer->GetVisibleRegion().GetBounds();
surface->SetSubpixelAntialiasingEnabled(
!(aLayer->GetContentFlags() & Layer::CONTENT_COMPONENT_ALPHA) ||
surface->GetOpaqueRect().Contains(
aTarget->UserToDevice(gfxRect(bounds.x, bounds.y, bounds.width, bounds.height))));
}
}
already_AddRefed<gfxContext>