1 files changed, 85 insertions, 0 deletions
diff --git a/src/gpu/ccpr/GrCCPRPathProcessor.h b/src/gpu/ccpr/GrCCPRPathProcessor.h
new file mode 100644
index 0000000000..a74455bc8e
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+++ b/src/gpu/ccpr/GrCCPRPathProcessor.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrCCPRPathProcessor_DEFINED
+#define GrCCPRPathProcessor_DEFINED
+
+#include "GrGeometryProcessor.h"
+#include "SkPath.h"
+#include <array>
+
+class GrOnFlushResourceProvider;
+class GrShaderCaps;
+
+/**
+ * This class draws AA paths using the coverage count masks produced by GrCCPRCoverageProcessor.
+ *
+ * Paths are drawn as bloated octagons, and coverage is derived from the coverage count mask and
+ * fill rule.
+ *
+ * The caller must set up an instance buffer as detailed below, then draw indexed-instanced
+ * triangles using the index and vertex buffers provided by this class.
+ */
+class GrCCPRPathProcessor : public GrGeometryProcessor {
+public:
+    static constexpr int kPerInstanceIndexCount = 6 * 3;
+    static sk_sp<GrBuffer> FindOrMakeIndexBuffer(GrOnFlushResourceProvider*);
+    static sk_sp<GrBuffer> FindOrMakeVertexBuffer(GrOnFlushResourceProvider*);
+
+    enum class InstanceAttribs {
+        kDevBounds,
+        kDevBounds45,
+        kViewMatrix, // FIXME: This causes a lot of duplication. It could move to a texel buffer.
+        kViewTranslate,
+        kAtlasOffset,
+        kColor
+    };
+    static constexpr int kNumInstanceAttribs = 1 + (int)InstanceAttribs::kColor;
+
+    struct Instance {
+        SkRect                   fDevBounds;
+        SkRect                   fDevBounds45; // Bounding box in "| 1  -1 | * devCoords" space.
+                                               //                  | 1   1 |
+        std::array<float, 4>     fViewMatrix;  // {kScaleX, kSkewy, kSkewX, kScaleY}
+        std::array<float, 2>     fViewTranslate;
+        std::array<int32_t, 2>   fAtlasOffset;
+        uint32_t                 fColor;
+
+        GR_STATIC_ASSERT(SK_SCALAR_IS_FLOAT);
+    };
+
+    GR_STATIC_ASSERT(4 * 17 == sizeof(Instance)); // FIXME: 4 * 16 by making fAtlasOffset int16_t's.
+
+    GrCCPRPathProcessor(GrResourceProvider*, sk_sp<GrTextureProxy> atlas, SkPath::FillType,
+                       const GrShaderCaps&);
+
+    const char* name() const override { return "GrCCPRPathProcessor"; }
+    const GrTexture* atlas() const { return fAtlasAccess.peekTexture(); }
+    SkPath::FillType fillType() const { return fFillType; }
+    const Attribute& getInstanceAttrib(InstanceAttribs attribID) const {
+        const Attribute& attrib = this->getAttrib((int)attribID);
+        SkASSERT(Attribute::InputRate::kPerInstance == attrib.fInputRate);
+        return attrib;
+    }
+    const Attribute& getEdgeNormsAttrib() const {
+        SkASSERT(1 + kNumInstanceAttribs == this->numAttribs());
+        const Attribute& attrib = this->getAttrib(kNumInstanceAttribs);
+        SkASSERT(Attribute::InputRate::kPerVertex == attrib.fInputRate);
+        return attrib;
+    }
+
+    void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
+    GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const override;
+
+private:
+    const SkPath::FillType   fFillType;
+    TextureSampler           fAtlasAccess;
+
+    typedef GrGeometryProcessor INHERITED;
+};
+
+#endif