Revert of AA stroke rects batch

src/gpu/GrAARectRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAARectRenderer.h"
 #include "GrBatch.h"
 #include "GrBatchTarget.h"
@@ skipping 91 matching lines @@
         fBatch.fColorIgnored = init.fColorIgnored;
         fBatch.fColor = fGeoData[0].fColor;
         fBatch.fUsesLocalCoords = init.fUsesLocalCoords;
         fBatch.fCoverageIgnored = init.fCoverageIgnored;
     }
 
     void generateGeometry(GrBatchTarget* batchTarget, const GrPipeline* pipeline) SK_OVERRIDE {
         bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
 
         SkMatrix localMatrix;
-        if (this->usesLocalCoords() && !this->viewMatrix().invert(&localMatrix)) {
+        if (!this->viewMatrix().invert(&localMatrix)) {
             SkDebugf("Cannot invert\n");
             return;
         }
 
-        SkAutoTUnref<const GrGeometryProcessor> gp(create_fill_rect_gp(canTweakAlphaForCoverage,
-                                                                       localMatrix));
+        const GrGeometryProcessor* gp = create_fill_rect_gp(canTweakAlphaForCoverage,
+                                                            localMatrix);
 
         batchTarget->initDraw(gp, pipeline);
+        gp->unref();
 
         // TODO this is hacky, but the only way we have to initialize the GP is to use the
         // GrPipelineInfo struct so we can generate the correct shader.  Once we have GrBatch
         // everywhere we can remove this nastiness
         GrPipelineInfo init;
         init.fColorIgnored = fBatch.fColorIgnored;
         init.fOverrideColor = GrColor_ILLEGAL;
         init.fCoverageIgnored = fBatch.fCoverageIgnored;
         init.fUsesLocalCoords = this->usesLocalCoords();
         gp->initBatchTracker(batchTarget->currentBatchTracker(), init);
 
         size_t vertexStride = gp->getVertexStride();
 
         SkASSERT(canTweakAlphaForCoverage ?
                  vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) :
                  vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
 
         int instanceCount = fGeoData.count();
         int vertexCount = kVertsPerAAFillRect * instanceCount;
 
         const GrVertexBuffer* vertexBuffer;
         int firstVertex;
 
-        void* vertices = batchTarget->vertexPool()->makeSpace(vertexStride,
+        void *vertices = batchTarget->vertexPool()->makeSpace(vertexStride,
                                                               vertexCount,
                                                               &vertexBuffer,
                                                               &firstVertex);
 
         for (int i = 0; i < instanceCount; i++) {
             const Geometry& args = fGeoData[i];
             this->generateAAFillRectGeometry(vertices,
-                                             i * kVertsPerAAFillRect * vertexStride,
-                                             vertexStride,
-                                             args.fColor,
-                                             args.fViewMatrix,
-                                             args.fRect,
-                                             args.fDevRect,
-                                             canTweakAlphaForCoverage);
+                                   i * kVertsPerAAFillRect * vertexStride,
+                                   vertexStride,
+                                   args.fColor,
+                                   args.fViewMatrix,
+                                   args.fRect,
+                                   args.fDevRect,
+                                   canTweakAlphaForCoverage);
         }
 
         GrDrawTarget::DrawInfo drawInfo;
         drawInfo.setPrimitiveType(kTriangles_GrPrimitiveType);
         drawInfo.setStartVertex(0);
         drawInfo.setStartIndex(0);
         drawInfo.setVerticesPerInstance(kVertsPerAAFillRect);
         drawInfo.setIndicesPerInstance(kIndicesPerAAFillRect);
         drawInfo.adjustStartVertex(firstVertex);
         drawInfo.setVertexBuffer(vertexBuffer);
@@ skipping 23 matching lines @@
     }
 
     GrColor color() const { return fBatch.fColor; }
     bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
     bool canTweakAlphaForCoverage() const { return fBatchOpt.fCanTweakAlphaForCoverage; }
     bool colorIgnored() const { return fBatch.fColorIgnored; }
     const SkMatrix& viewMatrix() const { return fGeoData[0].fViewMatrix; }
 
     bool onCombineIfPossible(GrBatch* t) SK_OVERRIDE {
         AAFillRectBatch* that = t->cast<AAFillRectBatch>();
+        if (this->canTweakAlphaForCoverage() != that->canTweakAlphaForCoverage()) {
+            return false;
+        }
 
-        SkASSERT(this->canTweakAlphaForCoverage() == that->canTweakAlphaForCoverage() &&
-                 this->usesLocalCoords() == that->usesLocalCoords() &&
-                 this->colorIgnored() == that->colorIgnored());
+        if (this->colorIgnored() != that->colorIgnored()) {
+            return false;
+        }
+
+        SkASSERT(this->usesLocalCoords() == that->usesLocalCoords());
         // We apply the viewmatrix to the rect points on the cpu.  However, if the pipeline uses
         // local coords then we won't be able to batch.  We could actually upload the viewmatrix
         // using vertex attributes in these cases, but haven't investigated that
         if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
             return false;
         }
 
         if (this->color() != that->color()) {
             fBatch.fColor = GrColor_ILLEGAL;
         }
@@ skipping 317 matching lines @@
     // edge, while vertex number of inner edge is 4, the same as miter-stroke.
     if (!miterStroke) {
         devOutside.inset(0, ry);
         devOutsideAssist.outset(0, ry);
     }
 
     this->geometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
                                devOutsideAssist, devInside, miterStroke);
 }
 
-class AAStrokeRectBatch : public GrBatch {
-public:
-    // TODO support AA rotated stroke rects by copying around view matrices
-    struct Geometry {
-        GrColor fColor;
-        SkRect fDevOutside;
-        SkRect fDevOutsideAssist;
-        SkRect fDevInside;
-        bool fMiterStroke;
-    };
-
-    static GrBatch* Create(const Geometry& geometry, const SkMatrix& viewMatrix,
-                           const GrIndexBuffer* indexBuffer) {
-        return SkNEW_ARGS(AAStrokeRectBatch, (geometry, viewMatrix, indexBuffer));
+static const GrGeometryProcessor* create_rect_gp(const GrPipelineBuilder& pipelneBuilder,
+                                                 GrColor color,
+                                                 CoverageAttribType* type,
+                                                 const SkMatrix& localMatrix) {
+    uint32_t flags = GrDefaultGeoProcFactory::kColor_GPType;
+    const GrGeometryProcessor* gp;
+    if (pipelneBuilder.canTweakAlphaForCoverage()) {
+        gp = GrDefaultGeoProcFactory::Create(flags, color, SkMatrix::I(), localMatrix);
+        SkASSERT(gp->getVertexStride() == sizeof(GrDefaultGeoProcFactory::PositionColorAttr));
+        *type = kUseColor_CoverageAttribType;
+    } else {
+        flags |= GrDefaultGeoProcFactory::kCoverage_GPType;
+        gp = GrDefaultGeoProcFactory::Create(flags, color, SkMatrix::I(), localMatrix,
+                                             GrColorIsOpaque(color));
+        SkASSERT(gp->getVertexStride()==sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
+        *type = kUseCoverage_CoverageAttribType;
     }
-
-    const char* name() const SK_OVERRIDE { return "AAStrokeRect"; }
-
-    void getInvariantOutputColor(GrInitInvariantOutput* out) const SK_OVERRIDE {
-        // When this is called on a batch, there is only one geometry bundle
-        if (!this->canTweakAlphaForCoverage() && GrColorIsOpaque(fGeoData[0].fColor)) {
-            out->setUnknownOpaqueFourComponents();
-        } else {
-            out->setUnknownFourComponents();
-        }
-    }
-
-    void getInvariantOutputCoverage(GrInitInvariantOutput* out) const SK_OVERRIDE {
-        if (this->canTweakAlphaForCoverage()) {
-            // uniform coverage
-            out->setKnownSingleComponent(0xff);
-        } else {
-            out->setUnknownSingleComponent();
-        }
-    }
-
-    void initBatchOpt(const GrBatchOpt& batchOpt) {
-        fBatchOpt = batchOpt;
-    }
-
-    void initBatchTracker(const GrPipelineInfo& init) SK_OVERRIDE {
-        // Handle any color overrides
-        if (init.fColorIgnored) {
-            fGeoData[0].fColor = GrColor_ILLEGAL;
-        } else if (GrColor_ILLEGAL != init.fOverrideColor) {
-            fGeoData[0].fColor = init.fOverrideColor;
-        }
-
-        // setup batch properties
-        fBatch.fColorIgnored = init.fColorIgnored;
-        fBatch.fColor = fGeoData[0].fColor;
-        fBatch.fUsesLocalCoords = init.fUsesLocalCoords;
-        fBatch.fCoverageIgnored = init.fCoverageIgnored;
-        fBatch.fMiterStroke = fGeoData[0].fMiterStroke;
-    }
-
-    void generateGeometry(GrBatchTarget* batchTarget, const GrPipeline* pipeline) SK_OVERRIDE {
-        bool canTweakAlphaForCoverage = this->canTweakAlphaForCoverage();
-
-        // Local matrix is ignored if we don't have local coords.  If we have localcoords we only
-        // batch with identical view matrices
-        SkMatrix localMatrix;
-        if (this->usesLocalCoords() && !this->viewMatrix().invert(&localMatrix)) {
-            SkDebugf("Cannot invert\n");
-            return;
-        }
-
-        SkAutoTUnref<const GrGeometryProcessor>gp(create_fill_rect_gp(canTweakAlphaForCoverage,
-                                                                      localMatrix));
-
-        batchTarget->initDraw(gp, pipeline);
-
-        // TODO this is hacky, but the only way we have to initialize the GP is to use the
-        // GrPipelineInfo struct so we can generate the correct shader.  Once we have GrBatch
-        // everywhere we can remove this nastiness
-        GrPipelineInfo init;
-        init.fColorIgnored = fBatch.fColorIgnored;
-        init.fOverrideColor = GrColor_ILLEGAL;
-        init.fCoverageIgnored = fBatch.fCoverageIgnored;
-        init.fUsesLocalCoords = this->usesLocalCoords();
-        gp->initBatchTracker(batchTarget->currentBatchTracker(), init);
-
-        size_t vertexStride = gp->getVertexStride();
-
-        SkASSERT(canTweakAlphaForCoverage ?
-                 vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorAttr) :
-                 vertexStride == sizeof(GrDefaultGeoProcFactory::PositionColorCoverageAttr));
-
-        int innerVertexNum = 4;
-        int outerVertexNum = this->miterStroke() ? 4 : 8;
-        int totalVertexNum = (outerVertexNum + innerVertexNum) * 2;
-
-        int instanceCount = fGeoData.count();
-        int vertexCount = totalVertexNum * instanceCount;
-
-        const GrVertexBuffer* vertexBuffer;
-        int firstVertex;
-
-        void* vertices = batchTarget->vertexPool()->makeSpace(vertexStride,
-                                                              vertexCount,
-                                                              &vertexBuffer,
-                                                              &firstVertex);
-
-        for (int i = 0; i < instanceCount; i++) {
-            const Geometry& args = fGeoData[i];
-            this->generateAAStrokeRectGeometry(vertices,
-                                               i * totalVertexNum * vertexStride,
-                                               vertexStride,
-                                               outerVertexNum,
-                                               innerVertexNum,
-                                               args.fColor,
-                                               args.fDevOutside,
-                                               args.fDevOutsideAssist,
-                                               args.fDevInside,
-                                               args.fMiterStroke,
-                                               canTweakAlphaForCoverage);
-        }
-
-        GrDrawTarget::DrawInfo drawInfo;
-        drawInfo.setPrimitiveType(kTriangles_GrPrimitiveType);
-        drawInfo.setStartVertex(0);
-        drawInfo.setStartIndex(0);
-        drawInfo.setVerticesPerInstance(totalVertexNum);
-        drawInfo.setIndicesPerInstance(aa_stroke_rect_index_count(this->miterStroke()));
-        drawInfo.adjustStartVertex(firstVertex);
-        drawInfo.setVertexBuffer(vertexBuffer);
-        drawInfo.setIndexBuffer(fIndexBuffer);
-
-        int maxInstancesPerDraw = kNumBevelStrokeRectsInIndexBuffer;
-
-        while (instanceCount) {
-            drawInfo.setInstanceCount(SkTMin(instanceCount, maxInstancesPerDraw));
-            drawInfo.setVertexCount(drawInfo.instanceCount() * drawInfo.verticesPerInstance());
-            drawInfo.setIndexCount(drawInfo.instanceCount() * drawInfo.indicesPerInstance());
-
-            batchTarget->draw(drawInfo);
-
-            drawInfo.setStartVertex(drawInfo.startVertex() + drawInfo.vertexCount());
-            instanceCount -= drawInfo.instanceCount();
-        }
-    }
-
-    SkSTArray<1, Geometry, true>* geoData() { return &fGeoData; }
-
-private:
-    AAStrokeRectBatch(const Geometry& geometry, const SkMatrix& viewMatrix,
-                      const GrIndexBuffer* indexBuffer)
-        : fIndexBuffer(indexBuffer) {
-        this->initClassID<AAStrokeRectBatch>();
-        fBatch.fViewMatrix = viewMatrix;
-        fGeoData.push_back(geometry);
-    }
-
-    GrColor color() const { return fBatch.fColor; }
-    bool usesLocalCoords() const { return fBatch.fUsesLocalCoords; }
-    bool canTweakAlphaForCoverage() const { return fBatchOpt.fCanTweakAlphaForCoverage; }
-    bool colorIgnored() const { return fBatch.fColorIgnored; }
-    const SkMatrix& viewMatrix() const { return fBatch.fViewMatrix; }
-    bool miterStroke() const { return fBatch.fMiterStroke; }
-
-    bool onCombineIfPossible(GrBatch* t) SK_OVERRIDE {
-        AAStrokeRectBatch* that = t->cast<AAStrokeRectBatch>();
-
-        // TODO batch across miterstroke changes
-        if (this->miterStroke() != that->miterStroke()) {
-            return false;
-        }
-
-        SkASSERT(this->canTweakAlphaForCoverage() == that->canTweakAlphaForCoverage() &&
-                 this->usesLocalCoords() == that->usesLocalCoords() &&
-                 this->colorIgnored() == that->colorIgnored());
-        // We apply the viewmatrix to the rect points on the cpu.  However, if the pipeline uses
-        // local coords then we won't be able to batch.  We could actually upload the viewmatrix
-        // using vertex attributes in these cases, but haven't investigated that
-        if (this->usesLocalCoords() && !this->viewMatrix().cheapEqualTo(that->viewMatrix())) {
-            return false;
-        }
-
-        if (this->color() != that->color()) {
-            fBatch.fColor = GrColor_ILLEGAL;
-        }
-        fGeoData.push_back_n(that->geoData()->count(), that->geoData()->begin());
-        return true;
-    }
-
-    void generateAAStrokeRectGeometry(void* vertices,
-                                      size_t offset,
-                                      size_t vertexStride,
-                                      int outerVertexNum,
-                                      int innerVertexNum,
-                                      GrColor color,
-                                      const SkRect& devOutside,
-                                      const SkRect& devOutsideAssist,
-                                      const SkRect& devInside,
-                                      bool miterStroke,
-                                      bool tweakAlphaForCoverage) const {
-        intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;
-
-        // We create vertices for four nested rectangles. There are two ramps from 0 to full
-        // coverage, one on the exterior of the stroke and the other on the interior.
-        // The following pointers refer to the four rects, from outermost to innermost.
-        SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
-        SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vertexStride);
-        SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vertexStride);
-        SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts +
-                                                      (2 * outerVertexNum + innerVertexNum) *
-                                                      vertexStride);
-
-    #ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
-        // TODO: this only really works if the X & Y margins are the same all around
-        // the rect (or if they are all >= 1.0).
-        SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
-        inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
-        inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
-        if (miterStroke) {
-            inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
-        } else {
-            inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom -
-                                                       devInside.fBottom);
-        }
-        SkASSERT(inset >= 0);
-    #else
-        SkScalar inset = SK_ScalarHalf;
-    #endif
-
-        if (miterStroke) {
-            // outermost
-            set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
-            // inner two
-            set_inset_fan(fan1Pos, vertexStride, devOutside,  inset,  inset);
-            set_inset_fan(fan2Pos, vertexStride, devInside,  -inset, -inset);
-            // innermost
-            set_inset_fan(fan3Pos, vertexStride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
-        } else {
-            SkPoint* fan0AssistPos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);
-            SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(verts +
-                                                                (outerVertexNum + 4) *
-                                                                vertexStride);
-            // outermost
-            set_inset_fan(fan0Pos, vertexStride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
-            set_inset_fan(fan0AssistPos, vertexStride, devOutsideAssist, -SK_ScalarHalf,
-                          -SK_ScalarHalf);
-            // outer one of the inner two
-            set_inset_fan(fan1Pos, vertexStride, devOutside,  inset,  inset);
-            set_inset_fan(fan1AssistPos, vertexStride, devOutsideAssist,  inset,  inset);
-            // inner one of the inner two
-            set_inset_fan(fan2Pos, vertexStride, devInside,  -inset, -inset);
-            // innermost
-            set_inset_fan(fan3Pos, vertexStride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
-        }
-
-        // Make verts point to vertex color and then set all the color and coverage vertex attrs
-        // values. The outermost rect has 0 coverage
-        verts += sizeof(SkPoint);
-        for (int i = 0; i < outerVertexNum; ++i) {
-            if (tweakAlphaForCoverage) {
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
-            } else {
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
-                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
-            }
-        }
-
-        // scale is the coverage for the the inner two rects.
-        int scale;
-        if (inset < SK_ScalarHalf) {
-            scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
-            SkASSERT(scale >= 0 && scale <= 255);
-        } else {
-            scale = 0xff;
-        }
-
-        float innerCoverage = GrNormalizeByteToFloat(scale);
-        GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
-
-        verts += outerVertexNum * vertexStride;
-        for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) {
-            if (tweakAlphaForCoverage) {
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
-            } else {
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
-                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) =
-                        innerCoverage;
-            }
-        }
-
-        // The innermost rect has 0 coverage
-        verts += (outerVertexNum + innerVertexNum) * vertexStride;
-        for (int i = 0; i < innerVertexNum; ++i) {
-            if (tweakAlphaForCoverage) {
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
-            } else {
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
-                *reinterpret_cast<GrColor*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
-            }
-        }
-    }
-
-    struct BatchTracker {
-        SkMatrix fViewMatrix;
-        GrColor fColor;
-        bool fUsesLocalCoords;
-        bool fColorIgnored;
-        bool fCoverageIgnored;
-        bool fMiterStroke;
-    };
-
-    GrBatchOpt fBatchOpt;
-    BatchTracker fBatch;
-    const GrIndexBuffer* fIndexBuffer;
-    SkSTArray<1, Geometry, true> fGeoData;
-};
+    return gp;
+}
 
 
 void GrAARectRenderer::geometryStrokeAARect(GrDrawTarget* target,
                                             GrPipelineBuilder* pipelineBuilder,
                                             GrColor color,
                                             const SkMatrix& viewMatrix,
                                             const SkRect& devOutside,
                                             const SkRect& devOutsideAssist,
                                             const SkRect& devInside,
                                             bool miterStroke) {
+    SkMatrix localMatrix;
+    if (!viewMatrix.invert(&localMatrix)) {
+        SkDebugf("Cannot invert\n");
+        return;
+    }
+
+    CoverageAttribType type;
+    SkAutoTUnref<const GrGeometryProcessor> gp(create_rect_gp(*pipelineBuilder, color, &type,
+                                                              localMatrix));
+
+    int innerVertexNum = 4;
+    int outerVertexNum = miterStroke ? 4 : 8;
+    int totalVertexNum = (outerVertexNum + innerVertexNum) * 2;
+
+    size_t vstride = gp->getVertexStride();
+    GrDrawTarget::AutoReleaseGeometry geo(target, totalVertexNum, vstride, 0);
+    if (!geo.succeeded()) {
+        SkDebugf("Failed to get space for vertices!\n");
+        return;
+    }
     GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(miterStroke);
     if (NULL == indexBuffer) {
         SkDebugf("Failed to create index buffer!\n");
         return;
     }
 
-    AAStrokeRectBatch::Geometry geometry;
-    geometry.fColor = color;
-    geometry.fDevOutside = devOutside;
-    geometry.fDevOutsideAssist = devOutsideAssist;
-    geometry.fDevInside = devInside;
-    geometry.fMiterStroke = miterStroke;
+    intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());
 
-    SkAutoTUnref<GrBatch> batch(AAStrokeRectBatch::Create(geometry, viewMatrix, indexBuffer));
-    target->drawBatch(pipelineBuilder, batch);
+    // We create vertices for four nested rectangles. There are two ramps from 0 to full
+    // coverage, one on the exterior of the stroke and the other on the interior.
+    // The following pointers refer to the four rects, from outermost to innermost.
+    SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
+    SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + outerVertexNum * vstride);
+    SkPoint* fan2Pos = reinterpret_cast<SkPoint*>(verts + 2 * outerVertexNum * vstride);
+    SkPoint* fan3Pos = reinterpret_cast<SkPoint*>(verts + (2 * outerVertexNum + innerVertexNum) * vstride);
+
+#ifndef SK_IGNORE_THIN_STROKED_RECT_FIX
+    // TODO: this only really works if the X & Y margins are the same all around
+    // the rect (or if they are all >= 1.0).
+    SkScalar inset = SkMinScalar(SK_Scalar1, devOutside.fRight - devInside.fRight);
+    inset = SkMinScalar(inset, devInside.fLeft - devOutside.fLeft);
+    inset = SkMinScalar(inset, devInside.fTop - devOutside.fTop);
+    if (miterStroke) {
+        inset = SK_ScalarHalf * SkMinScalar(inset, devOutside.fBottom - devInside.fBottom);
+    } else {
+        inset = SK_ScalarHalf * SkMinScalar(inset, devOutsideAssist.fBottom - devInside.fBottom);
+    }
+    SkASSERT(inset >= 0);
+#else
+    SkScalar inset = SK_ScalarHalf;
+#endif
+
+    if (miterStroke) {
+        // outermost
+        set_inset_fan(fan0Pos, vstride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
+        // inner two
+        set_inset_fan(fan1Pos, vstride, devOutside,  inset,  inset);
+        set_inset_fan(fan2Pos, vstride, devInside,  -inset, -inset);
+        // innermost
+        set_inset_fan(fan3Pos, vstride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
+    } else {
+        SkPoint* fan0AssistPos = reinterpret_cast<SkPoint*>(verts + 4 * vstride);
+        SkPoint* fan1AssistPos = reinterpret_cast<SkPoint*>(verts + (outerVertexNum + 4) * vstride);
+        // outermost
+        set_inset_fan(fan0Pos, vstride, devOutside, -SK_ScalarHalf, -SK_ScalarHalf);
+        set_inset_fan(fan0AssistPos, vstride, devOutsideAssist, -SK_ScalarHalf, -SK_ScalarHalf);
+        // outer one of the inner two
+        set_inset_fan(fan1Pos, vstride, devOutside,  inset,  inset);
+        set_inset_fan(fan1AssistPos, vstride, devOutsideAssist,  inset,  inset);
+        // inner one of the inner two
+        set_inset_fan(fan2Pos, vstride, devInside,  -inset, -inset);
+        // innermost
+        set_inset_fan(fan3Pos, vstride, devInside,   SK_ScalarHalf,  SK_ScalarHalf);
+    }
+
+    // Make verts point to vertex color and then set all the color and coverage vertex attrs values.
+    // The outermost rect has 0 coverage
+    verts += sizeof(SkPoint);
+    for (int i = 0; i < outerVertexNum; ++i) {
+        if (kUseCoverage_CoverageAttribType == type) {
+            *reinterpret_cast<GrColor*>(verts + i * vstride) = color;
+            *reinterpret_cast<float*>(verts + i * vstride + sizeof(GrColor)) = 0;
+        } else {
+            *reinterpret_cast<GrColor*>(verts + i * vstride) = 0;
+        }
+    }
+
+    // scale is the coverage for the the inner two rects.
+    int scale;
+    if (inset < SK_ScalarHalf) {
+        scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
+        SkASSERT(scale >= 0 && scale <= 255);
+    } else {
+        scale = 0xff;
+    }
+
+    float innerCoverage = GrNormalizeByteToFloat(scale);
+    GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);
+
+    verts += outerVertexNum * vstride;
+    for (int i = 0; i < outerVertexNum + innerVertexNum; ++i) {
+        if (kUseCoverage_CoverageAttribType == type) {
+            *reinterpret_cast<GrColor*>(verts + i * vstride) = color;
+            *reinterpret_cast<float*>(verts + i * vstride + sizeof(GrColor)) = innerCoverage;
+        } else {
+            *reinterpret_cast<GrColor*>(verts + i * vstride) = scaledColor;
+        }
+    }
+
+    // The innermost rect has 0 coverage
+    verts += (outerVertexNum + innerVertexNum) * vstride;
+    for (int i = 0; i < innerVertexNum; ++i) {
+        if (kUseCoverage_CoverageAttribType == type) {
+            *reinterpret_cast<GrColor*>(verts + i * vstride) = color;
+            *reinterpret_cast<GrColor*>(verts + i * vstride + sizeof(GrColor)) = 0;
+        } else {
+            *reinterpret_cast<GrColor*>(verts + i * vstride) = 0;
+        }
+    }
+
+    target->setIndexSourceToBuffer(indexBuffer);
+    target->drawIndexedInstances(pipelineBuilder,
+                                 gp,
+                                 kTriangles_GrPrimitiveType,
+                                 1,
+                                 totalVertexNum,
+                                 aa_stroke_rect_index_count(miterStroke));
+    target->resetIndexSource();
 }
 
 void GrAARectRenderer::fillAANestedRects(GrDrawTarget* target,
                                          GrPipelineBuilder* pipelineBuilder,
                                          GrColor color,
                                          const SkMatrix& viewMatrix,
                                          const SkRect rects[2]) {
     SkASSERT(viewMatrix.rectStaysRect());
     SkASSERT(!rects[1].isEmpty());
 
     SkRect devOutside, devOutsideAssist, devInside;
     viewMatrix.mapRect(&devOutside, rects[0]);
     // can't call mapRect for devInside since it calls sort
     viewMatrix.mapPoints((SkPoint*)&devInside, (const SkPoint*)&rects[1], 2);
 
     if (devInside.isEmpty()) {
         this->fillAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
                          devOutside);
         return;
     }
 
     this->geometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
                                devOutsideAssist, devInside, true);
 }