Fix the rendering error of SkDraw::drawVertices in gpu path for solid color

src/core/SkDraw.cpp

Index: src/core/SkDraw.cpp
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index 1739fefcc47f9ce99ee342d0068a8c8f7a2d84f7..5692fe11b319c7cbe1177aa38afeffbe982fa2e4 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -26,6 +26,7 @@
 #include "SkStroke.h"
 #include "SkTLazy.h"
 #include "SkUtils.h"
+#include "SkVertState.h"
 
 #include "SkAutoKern.h"
 #include "SkBitmapProcShader.h"
@@ -2210,133 +2211,6 @@ void SkDraw::drawTextOnPath(const char text[], size_t byteLength,
 
 ///////////////////////////////////////////////////////////////////////////////
 
-struct VertState {
-    int f0, f1, f2;
-
-    VertState(int vCount, const uint16_t indices[], int indexCount)
-            : fIndices(indices) {
-        fCurrIndex = 0;
-        if (indices) {
-            fCount = indexCount;
-        } else {
-            fCount = vCount;
-        }
-    }
-
-    typedef bool (*Proc)(VertState*);
-    Proc chooseProc(SkCanvas::VertexMode mode);
-
-private:
-    int             fCount;
-    int             fCurrIndex;
-    const uint16_t* fIndices;
-
-    static bool Triangles(VertState*);
-    static bool TrianglesX(VertState*);
-    static bool TriangleStrip(VertState*);
-    static bool TriangleStripX(VertState*);
-    static bool TriangleFan(VertState*);
-    static bool TriangleFanX(VertState*);
-};
-
-bool VertState::Triangles(VertState* state) {
-    int index = state->fCurrIndex;
-    if (index + 3 > state->fCount) {
-        return false;
-    }
-    state->f0 = index + 0;
-    state->f1 = index + 1;
-    state->f2 = index + 2;
-    state->fCurrIndex = index + 3;
-    return true;
-}
-
-bool VertState::TrianglesX(VertState* state) {
-    const uint16_t* indices = state->fIndices;
-    int index = state->fCurrIndex;
-    if (index + 3 > state->fCount) {
-        return false;
-    }
-    state->f0 = indices[index + 0];
-    state->f1 = indices[index + 1];
-    state->f2 = indices[index + 2];
-    state->fCurrIndex = index + 3;
-    return true;
-}
-
-bool VertState::TriangleStrip(VertState* state) {
-    int index = state->fCurrIndex;
-    if (index + 3 > state->fCount) {
-        return false;
-    }
-    state->f2 = index + 2;
-    if (index & 1) {
-        state->f0 = index + 1;
-        state->f1 = index + 0;
-    } else {
-        state->f0 = index + 0;
-        state->f1 = index + 1;
-    }
-    state->fCurrIndex = index + 1;
-    return true;
-}
-
-bool VertState::TriangleStripX(VertState* state) {
-    const uint16_t* indices = state->fIndices;
-    int index = state->fCurrIndex;
-    if (index + 3 > state->fCount) {
-        return false;
-    }
-    state->f2 = indices[index + 2];
-    if (index & 1) {
-        state->f0 = indices[index + 1];
-        state->f1 = indices[index + 0];
-    } else {
-        state->f0 = indices[index + 0];
-        state->f1 = indices[index + 1];
-    }
-    state->fCurrIndex = index + 1;
-    return true;
-}
-
-bool VertState::TriangleFan(VertState* state) {
-    int index = state->fCurrIndex;
-    if (index + 3 > state->fCount) {
-        return false;
-    }
-    state->f0 = 0;
-    state->f1 = index + 1;
-    state->f2 = index + 2;
-    state->fCurrIndex = index + 1;
-    return true;
-}
-
-bool VertState::TriangleFanX(VertState* state) {
-    const uint16_t* indices = state->fIndices;
-    int index = state->fCurrIndex;
-    if (index + 3 > state->fCount) {
-        return false;
-    }
-    state->f0 = indices[0];
-    state->f1 = indices[index + 1];
-    state->f2 = indices[index + 2];
-    state->fCurrIndex = index + 1;
-    return true;
-}
-
-VertState::Proc VertState::chooseProc(SkCanvas::VertexMode mode) {
-    switch (mode) {
-        case SkCanvas::kTriangles_VertexMode:
-            return fIndices ? TrianglesX : Triangles;
-        case SkCanvas::kTriangleStrip_VertexMode:
-            return fIndices ? TriangleStripX : TriangleStrip;
-        case SkCanvas::kTriangleFan_VertexMode:
-            return fIndices ? TriangleFanX : TriangleFan;
-        default:
-            return NULL;
-    }
-}
-
 typedef void (*HairProc)(const SkPoint&, const SkPoint&, const SkRasterClip&,
                          SkBlitter*);
 
@@ -2613,7 +2487,7 @@ void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
             SkScan::FillTriangle(tmp, *fRC, blitter.get());
         }
     } else {
-        // no colors[] and no texture
+        // no colors[] and no texture, stroke hairlines with paint's color.
         HairProc hairProc = ChooseHairProc(paint.isAntiAlias());
         const SkRasterClip& clip = *fRC;
         while (vertProc(&state)) {