skia2/experimental/AndroidPathRenderer/AndroidPathRenderer.h
jvanverth@google.com 74dda9018e This takes the convex path tesselator from the Android code and hooks it into a
GrPathRenderer. GrAndroidPathRenderer is activated by gyp flag 'skia_android_path_rendering'.

A few changes to get this to work:
- Had to change SkPaint* param to SkStrokeRec& in ConvexPathVertices()
- Had to copy the vertex buffer created by the Android code to GrDrawTarget-generated vertex buffer, and convert float alpha to GrColor for AA paths


git-svn-id: http://skia.googlecode.com/svn/trunk@7110 2bbb7eff-a529-9590-31e7-b0007b416f81
2013-01-09 21:04:52 +00:00

95 lines
2.2 KiB
C++

/*
* Copyright 2012 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef ANDROID_HWUI_PATH_RENDERER_H
#define ANDROID_HWUI_PATH_RENDERER_H
#include <SkTArray.h>
#include "Vertex.h"
class SkMatrix;
namespace android {
namespace uirenderer {
class VertexBuffer {
public:
VertexBuffer():
mBuffer(0),
mSize(0),
mCleanupMethod(0)
{}
~VertexBuffer() {
if (mCleanupMethod)
mCleanupMethod(mBuffer);
}
template <class TYPE>
TYPE* alloc(int size) {
mSize = size;
mBuffer = (void*)new TYPE[size];
mCleanupMethod = &(cleanup<TYPE>);
return (TYPE*)mBuffer;
}
void* getBuffer() { return mBuffer; }
unsigned int getSize() { return mSize; }
private:
template <class TYPE>
static void cleanup(void* buffer) {
delete[] (TYPE*)buffer;
}
void* mBuffer;
unsigned int mSize;
void (*mCleanupMethod)(void*);
};
class PathRenderer {
public:
static SkRect ComputePathBounds(const SkPath& path, const SkPaint* paint);
static void ConvexPathVertices(const SkPath& path, const SkStrokeRec& stroke, bool isAA,
const SkMatrix* transform, VertexBuffer* vertexBuffer);
private:
static bool ConvexPathPerimeterVertices(const SkPath &path, bool forceClose,
float sqrInvScaleX, float sqrInvScaleY, SkTArray<Vertex, true>* outputVertices);
/*
endpoints a & b,
control c
*/
static void RecursiveQuadraticBezierVertices(
float ax, float ay,
float bx, float by,
float cx, float cy,
float sqrInvScaleX, float sqrInvScaleY,
SkTArray<Vertex, true>* outputVertices);
/*
endpoints p1, p2
control c1, c2
*/
static void RecursiveCubicBezierVertices(
float p1x, float p1y,
float c1x, float c1y,
float p2x, float p2y,
float c2x, float c2y,
float sqrInvScaleX, float sqrInvScaleY,
SkTArray<Vertex, true>* outputVertices);
};
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_PATH_RENDERER_H