imgFrame::SurfaceWithFormat
imgFrame::SurfaceForDrawing(bool aDoPadding,
bool aDoPartialDecode,
bool aDoTile,
const nsIntMargin& aPadding,
gfxMatrix& aUserSpaceToImageSpace,
gfxRect& aFill,
gfxRect& aSubimage,
gfxRect& aSourceRect,
gfxRect& aImageRect)
{
gfxIntSize size(PRInt32(aImageRect.Width()), PRInt32(aImageRect.Height()));
if (!aDoPadding && !aDoPartialDecode) {
NS_ASSERTION(!mSinglePixel, "This should already have been handled");
return SurfaceWithFormat(new gfxSurfaceDrawable(ThebesSurface(), size), mFormat);
}
gfxRect available = gfxRect(mDecoded.x, mDecoded.y, mDecoded.width, mDecoded.height);
if (aDoTile || mSinglePixel) {
// Create a temporary surface.
// Give this surface an alpha channel because there are
// transparent pixels in the padding or undecoded area
gfxImageSurface::gfxImageFormat format = gfxASurface::ImageFormatARGB32;
nsRefPtr<gfxASurface> surface =
gfxPlatform::GetPlatform()->CreateOffscreenSurface(size, gfxImageSurface::ContentFromFormat(format));
if (!surface || surface->CairoStatus())
return SurfaceWithFormat();
// Fill 'available' with whatever we've got
gfxContext tmpCtx(surface);
tmpCtx.SetOperator(gfxContext::OPERATOR_SOURCE);
if (mSinglePixel) {
tmpCtx.SetDeviceColor(mSinglePixelColor);
} else {
tmpCtx.SetSource(ThebesSurface(), gfxPoint(aPadding.left, aPadding.top));
}
tmpCtx.Rectangle(available);
tmpCtx.Fill();
return SurfaceWithFormat(new gfxSurfaceDrawable(surface, size), format);
}
// Not tiling, and we have a surface, so we can account for
// padding and/or a partial decode just by twiddling parameters.
// First, update our user-space fill rect.
aSourceRect = aSourceRect.Intersect(available);
gfxMatrix imageSpaceToUserSpace = aUserSpaceToImageSpace;
imageSpaceToUserSpace.Invert();
aFill = imageSpaceToUserSpace.Transform(aSourceRect);
aSubimage = aSubimage.Intersect(available) - gfxPoint(aPadding.left, aPadding.top);
aUserSpaceToImageSpace.Multiply(gfxMatrix().Translate(-gfxPoint(aPadding.left, aPadding.top)));
aSourceRect = aSourceRect - gfxPoint(aPadding.left, aPadding.top);
aImageRect = gfxRect(0, 0, mSize.width, mSize.height);
gfxIntSize availableSize(mDecoded.width, mDecoded.height);
return SurfaceWithFormat(new gfxSurfaceDrawable(ThebesSurface(),
availableSize),
mFormat);
}
static bool
AccumulateLayerTransforms2D(Layer* aLayer,
Layer* aAncestor,
gfxMatrix& aMatrix)
{
// Accumulate the transforms between this layer and the subtree root layer.
for (Layer* l = aLayer; l && l != aAncestor; l = l->GetParent()) {
gfxMatrix l2D;
if (!GetBaseTransform2D(l, &l2D)) {
return false;
}
aMatrix.Multiply(l2D);
}
return true;
}