CGContextRef
gfxQuartzSurface::GetCGContextWithClip(gfxContext *ctx)
{
return cairo_quartz_get_cg_context_with_clip(ctx->GetCairo());
}
CGContextRef
gfxQuartzNativeDrawing::BeginNativeDrawing()
{
NS_ASSERTION(!mQuartzSurface, "BeginNativeDrawing called when drawing already in progress");
gfxPoint deviceOffset;
nsRefPtr<gfxASurface> surf = mContext->CurrentSurface(&deviceOffset.x, &deviceOffset.y);
if (!surf || surf->CairoStatus())
return nullptr;
// if this is a native Quartz surface, we don't have to redirect
// rendering to our own CGContextRef; in most cases, we are able to
// use the CGContextRef from the surface directly. we can extend
// this to support offscreen drawing fairly easily in the future.
if (surf->GetType() == gfxASurface::SurfaceTypeQuartz &&
(surf->GetContentType() == gfxASurface::CONTENT_COLOR ||
(surf->GetContentType() == gfxASurface::CONTENT_COLOR_ALPHA))) {
mQuartzSurface = static_cast<gfxQuartzSurface*>(surf.get());
mSurfaceContext = mContext;
// grab the CGContextRef
mCGContext = cairo_quartz_get_cg_context_with_clip(mSurfaceContext->GetCairo());
if (!mCGContext)
return nullptr;
gfxMatrix m = mContext->CurrentMatrix();
CGContextTranslateCTM(mCGContext, deviceOffset.x, deviceOffset.y);
// I -think- that this context will always have an identity
// transform (since we don't maintain a transform on it in
// cairo-land, and instead push/pop as needed)
gfxFloat x0 = m.x0;
gfxFloat y0 = m.y0;
// We round x0/y0 if we don't have a scale, because otherwise things get
// rendered badly
// XXX how should we be rounding x0/y0?
if (!m.HasNonTranslationOrFlip()) {
x0 = floor(x0 + 0.5);
y0 = floor(y0 + 0.5);
}
CGContextConcatCTM(mCGContext, CGAffineTransformMake(m.xx, m.yx,
m.xy, m.yy,
x0, y0));
// bug 382049 - need to explicity set the composite operation to sourceOver
CGContextSetCompositeOperation(mCGContext, kPrivateCGCompositeSourceOver);
} else {
mQuartzSurface = new gfxQuartzSurface(mNativeRect.Size(),
gfxASurface::ImageFormatARGB32);
if (mQuartzSurface->CairoStatus())
return nullptr;
mSurfaceContext = new gfxContext(mQuartzSurface);
// grab the CGContextRef
mCGContext = cairo_quartz_get_cg_context_with_clip(mSurfaceContext->GetCairo());
CGContextTranslateCTM(mCGContext, -mNativeRect.X(), -mNativeRect.Y());
}
return mCGContext;
}
