Add SkColorSpace to GrDrawContext

src/effects/SkXfermodeImageFilter.cpp

Index: src/effects/SkXfermodeImageFilter.cpp
diff --git a/src/effects/SkXfermodeImageFilter.cpp b/src/effects/SkXfermodeImageFilter.cpp
index 010253861d502b90bccf7677755135a61b38cece..6c3298d31c5506aa6b034c2ff3b5386c65b3855b 100644
--- a/src/effects/SkXfermodeImageFilter.cpp
+++ b/src/effects/SkXfermodeImageFilter.cpp
@@ -243,7 +243,8 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* sour
 

[robertphillips, 2016/07/21 19:22:41]

What if foreground & background have different color spaces ?

source is probably the correct answer here.

[Brian Osman, 2016/07/21 19:51:44]

Yes. Output should be in color space of source. I'll be plumbing
colorspace of FG/BG to the FP for this draw, so we convert both
to the destination space before combining them.

     sk_sp<GrDrawContext> drawContext(context->newDrawContext(SkBackingFit::kApprox,
                                                              bounds.width(), bounds.height(),
-                                                             kSkia8888_GrPixelConfig));
+                                                             kSkia8888_GrPixelConfig,
+                                                             sk_ref_sp(source->getColorSpace())));
     if (!drawContext) {
         return nullptr;
     }
@@ -252,11 +253,10 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* sour
     matrix.setTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
     drawContext->drawRect(GrNoClip(), paint, matrix, SkRect::Make(bounds));
 
-    // TODO: Get the colorSpace from the drawContext (once it has one)
     return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(bounds.width(), bounds.height()),
                                        kNeedNewImageUniqueID_SpecialImage,
                                        drawContext->asTexture(),
-                                       sk_ref_sp(source->getColorSpace()));
+                                       sk_ref_sp(drawContext->getColorSpace()));
 }
 
 #endif