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      1 /*
      2  * Copyright 2012 The Android Open Source Project
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef ANDROID_HWUI_PATH_RENDERER_H
      9 #define ANDROID_HWUI_PATH_RENDERER_H
     10 
     11 #include <SkTArray.h>
     12 
     13 #include "Vertex.h"
     14 
     15 class SkMatrix;
     16 
     17 namespace android {
     18 namespace uirenderer {
     19 
     20 class VertexBuffer {
     21 public:
     22     VertexBuffer():
     23         mBuffer(0),
     24         mSize(0),
     25         mCleanupMethod(0)
     26     {}
     27 
     28     ~VertexBuffer() {
     29         if (mCleanupMethod)
     30             mCleanupMethod(mBuffer);
     31     }
     32 
     33     template <class TYPE>
     34     TYPE* alloc(int size) {
     35         mSize = size;
     36         mBuffer = (void*)new TYPE[size];
     37         mCleanupMethod = &(cleanup<TYPE>);
     38 
     39         return (TYPE*)mBuffer;
     40     }
     41 
     42     void* getBuffer() { return mBuffer; }
     43     unsigned int getSize() { return mSize; }
     44 
     45 private:
     46     template <class TYPE>
     47     static void cleanup(void* buffer) {
     48         delete[] (TYPE*)buffer;
     49     }
     50 
     51     void* mBuffer;
     52     unsigned int mSize;
     53     void (*mCleanupMethod)(void*);
     54 };
     55 
     56 class PathRenderer {
     57 public:
     58     static SkRect ComputePathBounds(const SkPath& path, const SkPaint* paint);
     59 
     60     static void ConvexPathVertices(const SkPath& path, const SkStrokeRec& stroke, bool isAA,
     61             const SkMatrix* transform, VertexBuffer* vertexBuffer);
     62 
     63 private:
     64     static bool ConvexPathPerimeterVertices(const SkPath &path, bool forceClose,
     65         float sqrInvScaleX, float sqrInvScaleY, SkTArray<Vertex, true>* outputVertices);
     66 
     67 /*
     68   endpoints a & b,
     69   control c
     70  */
     71     static void RecursiveQuadraticBezierVertices(
     72             float ax, float ay,
     73             float bx, float by,
     74             float cx, float cy,
     75             float sqrInvScaleX, float sqrInvScaleY,
     76             SkTArray<Vertex, true>* outputVertices);
     77 
     78 /*
     79   endpoints p1, p2
     80   control c1, c2
     81  */
     82     static void RecursiveCubicBezierVertices(
     83             float p1x, float p1y,
     84             float c1x, float c1y,
     85             float p2x, float p2y,
     86             float c2x, float c2y,
     87             float sqrInvScaleX, float sqrInvScaleY,
     88             SkTArray<Vertex, true>* outputVertices);
     89 };
     90 
     91 }; // namespace uirenderer
     92 }; // namespace android
     93 
     94 #endif // ANDROID_HWUI_PATH_RENDERER_H
     95