Coverage counting path renderer

Initial implementation of a GPU path renderer that draws antialiased
paths by counting coverage in an offscreen buffer.

Initially disabled until it has had time to soak.

Bug: skia:
Change-Id: I003d8cfdf8dc62641581b5ea2dc4f0aa00108df6
Reviewed-on: https://skia-review.googlesource.com/21541
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/gpu/GrPathRendererChain.cpp b/src/gpu/GrPathRendererChain.cpp
index 076dea7b82..eda7a65319 100644
--- a/src/gpu/GrPathRendererChain.cpp
+++ b/src/gpu/GrPathRendererChain.cpp
@@ -12,8 +12,11 @@
 #include "GrShaderCaps.h"
 #include "gl/GrGLCaps.h"
 #include "GrContext.h"
+#include "GrContextPriv.h"
 #include "GrGpu.h"
 
+#include "ccpr/GrCoverageCountingPathRenderer.h"
+
 #include "ops/GrAAConvexPathRenderer.h"
 #include "ops/GrAAHairLinePathRenderer.h"
 #include "ops/GrAALinearizingConvexPathRenderer.h"
@@ -56,6 +59,12 @@ GrPathRendererChain::GrPathRendererChain(GrContext* context, const Options& opti
     if (options.fGpuPathRenderers & GpuPathRenderers::kSmall) {
         fChain.push_back(sk_make_sp<GrSmallPathRenderer>());
     }
+    if (options.fGpuPathRenderers & Options::GpuPathRenderers::kCoverageCounting) {
+        if (auto ccpr = GrCoverageCountingPathRenderer::CreateIfSupported(*context->caps())) {
+            context->contextPriv().addOnFlushCallbackObject(ccpr.get());
+            fChain.push_back(std::move(ccpr));
+        }
+    }
     if (options.fGpuPathRenderers & GpuPathRenderers::kTessellating) {
         fChain.push_back(sk_make_sp<GrTessellatingPathRenderer>());
     }