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Bug 1366097 - Part 6. Restrict use of SVGImageContext in VectorImage::GetImageContainerAtSize to permitted URIs. r=tnikkel

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This commit is contained in:
Andrew Osmond 2017-11-17 14:08:52 -05:00
parent 114b8069b3
commit b257c6e489
2 changed files with 64 additions and 41 deletions
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101
image/VectorImage.cpp
View File

@ -808,7 +808,8 @@ VectorImage::GetFrameInternal(const IntSize& aSize,
// different surface type (e.g. SourceSurfaceSharedData for WebRender). If
// we did not put anything in the cache, we will need to fallback to the
// snapshot surface.
RefPtr<SourceSurface> surface = DrawInternal(params, false);
bool contextPaint = aSVGContext && aSVGContext->GetContextPaint();
RefPtr<SourceSurface> surface = DrawInternal(params, contextPaint);
if (!surface) {
surface = dt->Snapshot();
}
@ -865,10 +866,61 @@ VectorImage::GetImageContainerAtSize(LayerManager* aManager,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags)
{
Maybe<SVGImageContext> newSVGContext;
MaybeRestrictSVGContext(newSVGContext, aSVGContext, aFlags);
// Since we do not support high quality scaling with SVG, we mask it off so
// that container requests with and without it map to the same container.
uint32_t flags = aFlags & ~FLAG_HIGH_QUALITY_SCALING;
return GetImageContainerImpl(aManager, aSize, aSVGContext, flags);
// Similarly the aspect ratio flag was already handled as part of the SVG
// context restriction above.
uint32_t flags = aFlags & ~(FLAG_HIGH_QUALITY_SCALING |
FLAG_FORCE_PRESERVEASPECTRATIO_NONE);
return GetImageContainerImpl(aManager, aSize,
newSVGContext ? newSVGContext : aSVGContext,
flags);
}
bool
VectorImage::MaybeRestrictSVGContext(Maybe<SVGImageContext>& aNewSVGContext,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags)
{
bool overridePAR = (aFlags & FLAG_FORCE_PRESERVEASPECTRATIO_NONE) && aSVGContext;
bool haveContextPaint = aSVGContext && aSVGContext->GetContextPaint();
bool blockContextPaint = false;
if (haveContextPaint) {
nsCOMPtr<nsIURI> imageURI = mURI->ToIURI();
blockContextPaint = !SVGContextPaint::IsAllowedForImageFromURI(imageURI);
}
if (overridePAR || blockContextPaint) {
// The key that we create for the image surface cache must match the way
// that the image will be painted, so we need to initialize a new matching
// SVGImageContext here in order to generate the correct key.
aNewSVGContext = aSVGContext; // copy
if (overridePAR) {
// The SVGImageContext must take account of the preserveAspectRatio
// overide:
MOZ_ASSERT(!aSVGContext->GetPreserveAspectRatio(),
"FLAG_FORCE_PRESERVEASPECTRATIO_NONE is not expected if a "
"preserveAspectRatio override is supplied");
Maybe<SVGPreserveAspectRatio> aspectRatio =
Some(SVGPreserveAspectRatio(SVG_PRESERVEASPECTRATIO_NONE,
SVG_MEETORSLICE_UNKNOWN));
aNewSVGContext->SetPreserveAspectRatio(aspectRatio);
}
if (blockContextPaint) {
// The SVGImageContext must not include context paint if the image is
// not allowed to use it:
aNewSVGContext->ClearContextPaint();
}
}
return haveContextPaint && !blockContextPaint;
}
//******************************************************************************
@ -907,45 +959,13 @@ VectorImage::Draw(gfxContext* aContext,
"Viewport size is required when using "
"FLAG_FORCE_PRESERVEASPECTRATIO_NONE");
bool overridePAR = (aFlags & FLAG_FORCE_PRESERVEASPECTRATIO_NONE) && aSVGContext;
bool haveContextPaint = aSVGContext && aSVGContext->GetContextPaint();
bool blockContextPaint = false;
if (haveContextPaint) {
nsCOMPtr<nsIURI> imageURI = mURI->ToIURI();
blockContextPaint = !SVGContextPaint::IsAllowedForImageFromURI(imageURI);
}
Maybe<SVGImageContext> newSVGContext;
if (overridePAR || blockContextPaint) {
// The key that we create for the image surface cache must match the way
// that the image will be painted, so we need to initialize a new matching
// SVGImageContext here in order to generate the correct key.
newSVGContext = aSVGContext; // copy
if (overridePAR) {
// The SVGImageContext must take account of the preserveAspectRatio
// overide:
MOZ_ASSERT(!aSVGContext->GetPreserveAspectRatio(),
"FLAG_FORCE_PRESERVEASPECTRATIO_NONE is not expected if a "
"preserveAspectRatio override is supplied");
Maybe<SVGPreserveAspectRatio> aspectRatio =
Some(SVGPreserveAspectRatio(SVG_PRESERVEASPECTRATIO_NONE,
SVG_MEETORSLICE_UNKNOWN));
newSVGContext->SetPreserveAspectRatio(aspectRatio);
}
if (blockContextPaint) {
// The SVGImageContext must not include context paint if the image is
// not allowed to use it:
newSVGContext->ClearContextPaint();
}
}
float animTime = (aWhichFrame == FRAME_FIRST)
? 0.0f : mSVGDocumentWrapper->GetCurrentTime();
Maybe<SVGImageContext> newSVGContext;
bool contextPaint =
MaybeRestrictSVGContext(newSVGContext, aSVGContext, aFlags);
SVGDrawingParameters params(aContext, aSize, aRegion, aSamplingFilter,
newSVGContext ? newSVGContext : aSVGContext,
animTime, aFlags, aOpacity);
@ -968,8 +988,7 @@ VectorImage::Draw(gfxContext* aContext,
return DrawResult::TEMPORARY_ERROR;
}
RefPtr<SourceSurface> surface =
DrawInternal(params, haveContextPaint && !blockContextPaint);
RefPtr<SourceSurface> surface = DrawInternal(params, contextPaint);
// Image got put into a painted layer, it will not be shared with another
// process.

4
image/VectorImage.h
View File

@ -97,6 +97,10 @@ private:
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags);
bool MaybeRestrictSVGContext(Maybe<SVGImageContext>& aNewSVGContext,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aFlags);
already_AddRefed<SourceSurface>
DrawInternal(const SVGDrawingParameters& aParams, bool aContextPaint);