DrawResult
ClippedImage::DrawSingleTile(gfxContext* aContext,
const nsIntSize& aSize,
const ImageRegion& aRegion,
uint32_t aWhichFrame,
GraphicsFilter aFilter,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags)
{
MOZ_ASSERT(!MustCreateSurface(aContext, aSize, aRegion, aFlags),
"Shouldn't need to create a surface");
gfxRect clip(mClip.x, mClip.y, mClip.width, mClip.height);
nsIntSize size(aSize), innerSize(aSize);
if (NS_SUCCEEDED(InnerImage()->GetWidth(&innerSize.width)) &&
NS_SUCCEEDED(InnerImage()->GetHeight(&innerSize.height))) {
double scaleX = aSize.width / clip.width;
double scaleY = aSize.height / clip.height;
// Map the clip and size to the scale requested by the caller.
clip.Scale(scaleX, scaleY);
size = innerSize;
size.Scale(scaleX, scaleY);
} else {
MOZ_ASSERT(false,
"If ShouldClip() led us to draw then we should never get here");
}
// We restrict our drawing to only the clipping region, and translate so that
// the clipping region is placed at the position the caller expects.
ImageRegion region(aRegion);
region.MoveBy(clip.x, clip.y);
region = region.Intersect(clip);
gfxContextMatrixAutoSaveRestore saveMatrix(aContext);
aContext->Multiply(gfxMatrix::Translation(-clip.x, -clip.y));
return InnerImage()->Draw(aContext, size, region,
aWhichFrame, aFilter,
aSVGContext.map(UnclipViewport,
make_pair(innerSize, mClip.Size())),
aFlags);
}
ClippedImage::Draw(gfxContext* aContext,
const nsIntSize& aSize,
const ImageRegion& aRegion,
uint32_t aWhichFrame,
SamplingFilter aSamplingFilter,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags,
float aOpacity)
{
if (!ShouldClip()) {
return InnerImage()->Draw(aContext, aSize, aRegion, aWhichFrame,
aSamplingFilter, aSVGContext, aFlags, aOpacity);
}
// Check for tiling. If we need to tile then we need to create a
// gfxCallbackDrawable to handle drawing for us.
if (MustCreateSurface(aContext, aSize, aRegion, aFlags)) {
// Create a temporary surface containing a single tile of this image.
// GetFrame will call DrawSingleTile internally.
DrawResult result;
RefPtr<SourceSurface> surface;
Tie(result, surface) =
GetFrameInternal(aSize, aSVGContext, aWhichFrame, aFlags, aOpacity);
if (!surface) {
MOZ_ASSERT(result != DrawResult::SUCCESS);
return result;
}
// Create a drawable from that surface.
RefPtr<gfxSurfaceDrawable> drawable =
new gfxSurfaceDrawable(surface, aSize);
// Draw.
gfxUtils::DrawPixelSnapped(aContext, drawable, aSize, aRegion,
SurfaceFormat::B8G8R8A8, aSamplingFilter,
aOpacity);
return result;
}
return DrawSingleTile(aContext, aSize, aRegion, aWhichFrame,
aSamplingFilter, aSVGContext, aFlags, aOpacity);
}
DrawResult
ClippedImage::DrawSingleTile(gfxContext* aContext,
const nsIntSize& aSize,
const ImageRegion& aRegion,
uint32_t aWhichFrame,
SamplingFilter aSamplingFilter,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags)
{
MOZ_ASSERT(!MustCreateSurface(aContext, aSize, aRegion, aFlags),
"Shouldn't need to create a surface");
gfxRect clip(mClip.x, mClip.y, mClip.width, mClip.height);
nsIntSize size(aSize), innerSize(aSize);
bool needScale = false;
if (mSVGViewportSize && !mSVGViewportSize->IsEmpty()) {
innerSize = *mSVGViewportSize;
needScale = true;
} else if (NS_SUCCEEDED(InnerImage()->GetWidth(&innerSize.width)) &&
NS_SUCCEEDED(InnerImage()->GetHeight(&innerSize.height))) {
needScale = true;
} else {
MOZ_ASSERT_UNREACHABLE(
"If ShouldClip() led us to draw then we should never get here");
}
if (needScale) {
double scaleX = aSize.width / clip.width;
double scaleY = aSize.height / clip.height;
// Map the clip and size to the scale requested by the caller.
clip.Scale(scaleX, scaleY);
size = innerSize;
size.Scale(scaleX, scaleY);
}
// We restrict our drawing to only the clipping region, and translate so that
// the clipping region is placed at the position the caller expects.
ImageRegion region(aRegion);
region.MoveBy(clip.x, clip.y);
region = region.Intersect(clip);
gfxContextMatrixAutoSaveRestore saveMatrix(aContext);
aContext->Multiply(gfxMatrix::Translation(-clip.x, -clip.y));
auto unclipViewport = [&](const SVGImageContext& aOldContext) {
// Map the viewport to the inner image. Note that we don't take the aSize
// parameter of imgIContainer::Draw into account, just the clipping region.
// The size in pixels at which the output will ultimately be drawn is
// irrelevant here since the purpose of the SVG viewport size is to
// determine what *region* of the SVG document will be drawn.
CSSIntSize vSize(aOldContext.GetViewportSize());
vSize.width = ceil(vSize.width * double(innerSize.width) / mClip.width);
vSize.height =
ceil(vSize.height * double(innerSize.height) / mClip.height);
return SVGImageContext(vSize,
aOldContext.GetPreserveAspectRatio());
};
return InnerImage()->Draw(aContext, size, region,
aWhichFrame, aSamplingFilter,
aSVGContext.map(unclipViewport),
aFlags);
}
