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Bug 1051592 - Clip DrawTargetCairo's context to the surface bound to prevent massive mask allocations within cairo. r=jrmuizel

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--HG--
extra : rebase_source : 89bc9dd9c4d5120c73b025d5106827594fac6663
This commit is contained in:
Matt Woodrow 2014-08-15 14:23:22 +12:00
parent f418beb13f
commit f4ffbf1eae
1 changed files with 15 additions and 1 deletions
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16
gfx/2d/DrawTargetCairo.cpp
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@ -68,7 +68,14 @@ public:
MOZ_ASSERT(cairo_status(mCtx) || dt->GetTransform() == GetTransform());
}
~AutoPrepareForDrawing() { cairo_restore(mCtx); }
~AutoPrepareForDrawing()
{
cairo_restore(mCtx);
cairo_status_t status = cairo_status(mCtx);
if (status) {
gfxWarning() << "DrawTargetCairo context in error state: " << cairo_status_to_string(status) << "(" << status << ")";
}
}
private:
#ifdef DEBUG
@ -1290,6 +1297,13 @@ DrawTargetCairo::InitAlreadyReferenced(cairo_surface_t* aSurface, const IntSize&
mSize = aSize;
mFormat = aFormat ? *aFormat : CairoContentToGfxFormat(cairo_surface_get_content(aSurface));
// Cairo image surface have a bug where they will allocate a mask surface (for clipping)
// the size of the clip extents, and don't take the surface extents into account.
// Add a manual clip to the surface extents to prevent this.
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, mSize.width, mSize.height);
cairo_clip(mContext);
if (mFormat == SurfaceFormat::B8G8R8A8 ||
mFormat == SurfaceFormat::R8G8B8A8) {
SetPermitSubpixelAA(false);