nsIntSize
ClippedImage::OptimalImageSizeForDest(const gfxSize& aDest,
uint32_t aWhichFrame,
SamplingFilter aSamplingFilter,
uint32_t aFlags)
{
if (!ShouldClip()) {
return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame,
aSamplingFilter, aFlags);
}
int32_t imgWidth, imgHeight;
bool needScale = false;
bool forceUniformScaling = false;
if (mSVGViewportSize && !mSVGViewportSize->IsEmpty()) {
imgWidth = mSVGViewportSize->width;
imgHeight = mSVGViewportSize->height;
needScale = true;
forceUniformScaling = (aFlags & imgIContainer::FLAG_FORCE_UNIFORM_SCALING);
} else if (NS_SUCCEEDED(InnerImage()->GetWidth(&imgWidth)) &&
NS_SUCCEEDED(InnerImage()->GetHeight(&imgHeight))) {
needScale = true;
}
if (needScale) {
// To avoid ugly sampling artifacts, ClippedImage needs the image size to
// be chosen such that the clipping region lies on pixel boundaries.
// First, we select a scale that's good for ClippedImage. An integer
// multiple of the size of the clipping region is always fine.
IntSize scale = IntSize::Ceil(aDest.width / mClip.width,
aDest.height / mClip.height);
if (forceUniformScaling) {
scale.width = scale.height = max(scale.height, scale.width);
}
// Determine the size we'd prefer to render the inner image at, and ask the
// inner image what size we should actually use.
gfxSize desiredSize(imgWidth * scale.width, imgHeight * scale.height);
nsIntSize innerDesiredSize =
InnerImage()->OptimalImageSizeForDest(desiredSize, aWhichFrame,
aSamplingFilter, aFlags);
// To get our final result, we take the inner image's desired size and
// determine how large the clipped region would be at that scale. (Again, we
// ensure an integer multiple of the size of the clipping region.)
IntSize finalScale = IntSize::Ceil(double(innerDesiredSize.width) / imgWidth,
double(innerDesiredSize.height) / imgHeight);
return mClip.Size() * finalScale;
}
MOZ_ASSERT(false,
"If ShouldClip() led us to draw then we should never get here");
return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame,
aSamplingFilter, aFlags);
}
ClippedImage::GetImageSpaceInvalidationRect(const nsIntRect& aRect)
{
if (!ShouldClip()) {
return InnerImage()->GetImageSpaceInvalidationRect(aRect);
}
nsIntRect rect(InnerImage()->GetImageSpaceInvalidationRect(aRect));
rect = rect.Intersect(mClip);
rect.MoveBy(-mClip.x, -mClip.y);
return rect;
}
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);
}
nsIntSize
ClippedImage::OptimalImageSizeForDest(const gfxSize& aDest,
uint32_t aWhichFrame,
GraphicsFilter aFilter, uint32_t aFlags)
{
if (!ShouldClip()) {
return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame, aFilter,
aFlags);
}
int32_t imgWidth, imgHeight;
if (NS_SUCCEEDED(InnerImage()->GetWidth(&imgWidth)) &&
NS_SUCCEEDED(InnerImage()->GetHeight(&imgHeight))) {
// To avoid ugly sampling artifacts, ClippedImage needs the image size to
// be chosen such that the clipping region lies on pixel boundaries.
// First, we select a scale that's good for ClippedImage. An integer
// multiple of the size of the clipping region is always fine.
nsIntSize scale(ceil(aDest.width / mClip.width),
ceil(aDest.height / mClip.height));
// Determine the size we'd prefer to render the inner image at, and ask the
// inner image what size we should actually use.
gfxSize desiredSize(imgWidth * scale.width, imgHeight * scale.height);
nsIntSize innerDesiredSize =
InnerImage()->OptimalImageSizeForDest(desiredSize, aWhichFrame,
aFilter, aFlags);
// To get our final result, we take the inner image's desired size and
// determine how large the clipped region would be at that scale. (Again, we
// ensure an integer multiple of the size of the clipping region.)
nsIntSize finalScale(ceil(double(innerDesiredSize.width) / imgWidth),
ceil(double(innerDesiredSize.height) / imgHeight));
return mClip.Size() * finalScale;
} else {
MOZ_ASSERT(false,
"If ShouldClip() led us to draw then we should never get here");
return InnerImage()->OptimalImageSizeForDest(aDest, aWhichFrame, aFilter,
aFlags);
}
}
