SkPatch abstraction

include/core/SkPatch.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPatch_DEFINED
+#define SkPatch_DEFINED
+
+#include "SkColor.h"
+#include "SkPoint.h"
+
+/**
+ * Class that represents a coons patch.
+ */
+class SK_API SkPatch {
+
+public:
+    
+    struct PatchData {

[bsalomon, 2014/07/25 13:14:34]

Maybe a comment here about how this is to be used. Can we use "vertex" instead
of "vert"? It better matches the drawVertices param naming.

[dandov, 2014/07/25 14:08:14]

Done.

+        int fVertCount, fIndexCount;
+        SkPoint* fPoints;
+        SkPoint* fTexCoords;
+        uint32_t* fColors;
+        uint16_t* fIndices;
+        
+        PatchData()
+        : fVertCount(0)
+        , fIndexCount(0)
+        , fPoints(NULL)
+        , fTexCoords(NULL)
+        , fColors(NULL)
+        , fIndices(NULL) { }
+        
+        ~PatchData() {
+            SkDELETE_ARRAY(fPoints);
+            SkDELETE_ARRAY(fTexCoords);
+            SkDELETE_ARRAY(fColors);
+            SkDELETE_ARRAY(fIndices);
+        }
+    };
+    
+    /**
+     * Points are in the following order:
+     *              (bottom curve)

[bsalomon, 2014/07/25 13:14:34]

I thought from our discussion yesterday that the top curve had ctrl points
0,1,2,3? Either way, I still think its weird for the diagram to have the bottom
curve above the top curve.

[dandov, 2014/07/25 14:08:14]

Sorry I uploaded this cl before our discussion. It is already fixed. 

+     *                0 1 2 3
+     * (left curve)  11     4   (right curve)
+     *               10     5
+     *                9 8 7 6
+     *              (top curve)
+     * Used pointer to an array to guarantee that this method receives an array of 4 SkColors
+     */
+    SkPatch(SkPoint points[12], SkColor colors[4], int res);
+
+    void getVertexData(SkPatch::PatchData* data);
+
+    void getBottomPoints(SkPoint points[4]) {
+        points[0] = fCtrlPoints[0];
+        points[1] = fCtrlPoints[1];
+        points[2] = fCtrlPoints[2];
+        points[3] = fCtrlPoints[3];
+    }
+    
+    const void getTopPoints(SkPoint points[4]) {

[bsalomon, 2014/07/25 13:14:34]

const void? But I wanna change the void!

[dandov, 2014/07/25 14:08:14]

Missed those ones, thanks. 

+        points[0] = fCtrlPoints[9];
+        points[1] = fCtrlPoints[8];
+        points[2] = fCtrlPoints[7];
+        points[3] = fCtrlPoints[6];
+    }
+
+    const void getLeftPoints(SkPoint points[4]) {
+        points[0] = fCtrlPoints[0];
+        points[1] = fCtrlPoints[11];
+        points[2] = fCtrlPoints[10];
+        points[3] = fCtrlPoints[9];
+    }
+
+    const void getRightPoints(SkPoint points[4]) {
+        points[0] = fCtrlPoints[3];
+        points[1] = fCtrlPoints[4];
+        points[2] = fCtrlPoints[5];
+        points[3] = fCtrlPoints[6];
+    }
+    
+
+private:
+    SkPoint fCtrlPoints[12];
+    SkPMColor fCornerColors[4];
+    int fDivX, fDivY;
+};
+
+#endif