SkCanvas::drawPatch param SkPoint[12]

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 "SkPreConfig.h"
-#include "SkPoint.h"
-
-/**
- * Class that represents a coons patch.
- */
-class SK_API SkPatch {
-
-public:
-    /**
-     * Structure that holds the vertex data related to the tessellation of a SkPatch. It is passed 
-     * as a parameter to the function getVertexData which sets the points, colors and texture 
-     * coordinates of the vertices and the indices for them to be drawn as triangles.
-     */
-    struct VertexData {
-        int fVertexCount, fIndexCount;
-        SkPoint* fPoints;
-        SkPoint* fTexCoords;
-        uint32_t* fColors;
-        uint16_t* fIndices;
-        
-        VertexData()
-        : fVertexCount(0)
-        , fIndexCount(0)
-        , fPoints(NULL)
-        , fTexCoords(NULL)
-        , fColors(NULL)
-        , fIndices(NULL) { }
-        
-        ~VertexData() {
-            SkDELETE_ARRAY(fPoints);
-            SkDELETE_ARRAY(fTexCoords);
-            SkDELETE_ARRAY(fColors);
-            SkDELETE_ARRAY(fIndices);
-        }
-    };
-    
-    // Enums for control points based on the order specified in the constructor (clockwise).
-    enum CubicCtrlPts {
-        kTopP0_CubicCtrlPts = 0,
-        kTopP1_CubicCtrlPts = 1,
-        kTopP2_CubicCtrlPts = 2,
-        kTopP3_CubicCtrlPts = 3,
-        
-        kRightP0_CubicCtrlPts = 3,
-        kRightP1_CubicCtrlPts = 4,
-        kRightP2_CubicCtrlPts = 5,
-        kRightP3_CubicCtrlPts = 6,
-        
-        kBottomP0_CubicCtrlPts = 9,
-        kBottomP1_CubicCtrlPts = 8,
-        kBottomP2_CubicCtrlPts = 7,
-        kBottomP3_CubicCtrlPts = 6,
-        
-        kLeftP0_CubicCtrlPts = 0,
-        kLeftP1_CubicCtrlPts = 11,
-        kLeftP2_CubicCtrlPts = 10,
-        kLeftP3_CubicCtrlPts = 9,
-    };
-    
-    // Enum for corner colors also clockwise.
-    enum CornerColors {
-        kTopLeft_CornerColors = 0,
-        kTopRight_CornerColors,
-        kBottomRight_CornerColors,
-        kBottomLeft_CornerColors
-    };
-    
-    enum {
-        kNumCtrlPts = 12,
-        kNumColors = 4,
-        kNumPtsCubic = 4
-    };
-    
-    /**
-     * Points are in the following order:
-     *              (top curve)
-     *                0 1 2 3
-     * (left curve)  11     4   (right curve)
-     *               10     5
-     *                9 8 7 6
-     *              (bottom curve)
-     */
-    SkPatch() { }
-    SkPatch(const SkPoint points[12], const SkColor colors[4]);
-
-    /**
-     * Function that evaluates the coons patch interpolation.
-     * data refers to the pointer of the PatchData struct in which the tessellation data is set.
-     * lod refers the level of detail for each axis.
-     */
-    bool getVertexData(SkPatch::VertexData* data, int lodX, int lodY) const;
-
-    void getTopPoints(SkPoint points[4]) const {
-        points[0] = fCtrlPoints[kTopP0_CubicCtrlPts];
-        points[1] = fCtrlPoints[kTopP1_CubicCtrlPts];
-        points[2] = fCtrlPoints[kTopP2_CubicCtrlPts];
-        points[3] = fCtrlPoints[kTopP3_CubicCtrlPts];
-    }
-    
-    void getBottomPoints(SkPoint points[4]) const {
-        points[0] = fCtrlPoints[kBottomP0_CubicCtrlPts];
-        points[1] = fCtrlPoints[kBottomP1_CubicCtrlPts];
-        points[2] = fCtrlPoints[kBottomP2_CubicCtrlPts];
-        points[3] = fCtrlPoints[kBottomP3_CubicCtrlPts];
-    }
-
-    void getLeftPoints(SkPoint points[4]) const {
-        points[0] = fCtrlPoints[kLeftP0_CubicCtrlPts];
-        points[1] = fCtrlPoints[kLeftP1_CubicCtrlPts];
-        points[2] = fCtrlPoints[kLeftP2_CubicCtrlPts];
-        points[3] = fCtrlPoints[kLeftP3_CubicCtrlPts];
-    }
-
-    void getRightPoints(SkPoint points[4]) const {
-        points[0] = fCtrlPoints[kRightP0_CubicCtrlPts];
-        points[1] = fCtrlPoints[kRightP1_CubicCtrlPts];
-        points[2] = fCtrlPoints[kRightP2_CubicCtrlPts];
-        points[3] = fCtrlPoints[kRightP3_CubicCtrlPts];
-    }
-    
-    void getCornerPoints(SkPoint points[4]) const {
-        points[0] = fCtrlPoints[kTopP0_CubicCtrlPts];
-        points[1] = fCtrlPoints[kTopP3_CubicCtrlPts];
-        points[2] = fCtrlPoints[kBottomP3_CubicCtrlPts];
-        points[3] = fCtrlPoints[kBottomP0_CubicCtrlPts];
-    }
-    
-    const SkPoint* getControlPoints() const {
-        return fCtrlPoints;
-    }
-    
-    const SkColor* getColors() const {
-        return fCornerColors;
-    }
-    
-    void setPoints(const SkPoint points[12]) {
-        memcpy(fCtrlPoints, points, kNumCtrlPts * sizeof(SkPoint));
-    }
-    
-    void setColors(const SkColor colors[4]) {
-        memcpy(fCornerColors, colors, kNumColors * sizeof(SkColor));
-    }
-
-    void reset(const SkPoint points[12], const SkColor colors[4]) {
-        this->setPoints(points);
-        this->setColors(colors);
-    }
-
-    /**
-     *  Write the patch to the buffer, and return the number of bytes written.
-     *  If buffer is NULL, it still returns the number of bytes.
-     */
-    size_t writeToMemory(void* buffer) const;
-    
-    /**
-     * Initializes the patch from the buffer
-     *
-     * buffer Memory to read from
-     * length Amount of memory available in the buffer
-     * returns the number of bytes read (must be a multiple of 4) or
-     *         0 if there was not enough memory available
-     */
-    size_t readFromMemory(const void* buffer, size_t length);
-    
-private:
-    SkPoint fCtrlPoints[kNumCtrlPts];
-    SkColor fCornerColors[kNumColors];
-};
-
-#endif