Delete GPU alpha clip masks

The cost of switching render targets on each draw to make a custom
clip is enormous. There are virtually no circumstances where this will
outperform our cached, multi-threaded software mask generator. The
tried-and-true approach to clipping on-GPU is with analytic FPs. And
now that we support CCPR clip FPs, there ulitmately should be very few
clip stacks that even require a mask as long as they don't use
deprecated SkClipOps.

Bug: skia:
Change-Id: I79c5558c93c1b99179f1e933d029f69b14ad1ce3
Reviewed-on: https://skia-review.googlesource.com/116724
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>

1 files changed, 2 insertions, 19 deletions

diff --git a/src/gpu/GrClipStackClip.h b/src/gpu/GrClipStackClip.h
index aeb983468c..05d9f18c88 100644
--- a/src/gpu/GrClipStackClip.h
+++ b/src/gpu/GrClipStackClip.h
@@ -37,31 +37,14 @@ public:
     static const char kMaskTestTag[];
 
 private:
-    static bool PathNeedsSWRenderer(GrContext* context,
-                                    const SkIRect& scissorRect,
-                                    bool hasUserStencilSettings,
-                                    const GrRenderTargetContext*,
-                                    const SkMatrix& viewMatrix,
-                                    const SkClipStack::Element* element,
-                                    GrPathRenderer** prOut,
-                                    bool needsStencil);
-
     bool applyClipMask(GrContext*, GrRenderTargetContext*, const GrReducedClip&,
                        bool hasUserStencilSettings, GrAppliedClip*) const;
 
-    // Creates an alpha mask of the clip. The mask is a rasterization of elements through the
-    // rect specified by clipSpaceIBounds.
-    sk_sp<GrTextureProxy> createAlphaClipMask(GrContext*, const GrReducedClip&) const;
-
-    // Similar to createAlphaClipMask but it rasterizes in SW and uploads to the result texture.
+    // Creates an alpha mask of the remaining reduced clip elements that could not be handled
+    // analytically on the GPU. The mask fills the reduced clip's scissor rect.
     sk_sp<GrTextureProxy> createSoftwareClipMask(GrContext*, const GrReducedClip&,
                                                  GrRenderTargetContext*) const;
 
-    static bool UseSWOnlyPath(GrContext*,
-                              bool hasUserStencilSettings,
-                              const GrRenderTargetContext*,
-                              const GrReducedClip&);
-
     const SkClipStack*  fStack;
 };