Polygonal rendering of simple fill shapes

bug:4419017

Change-Id: If0428e1732139786cba15f54b285d880e4a56b89

1 files changed, 111 insertions, 0 deletions

diff --git a/libs/hwui/PathRenderer.h b/libs/hwui/PathRenderer.h
new file mode 100644
index 0000000..1354f16
--- /dev/null
+++ b/libs/hwui/PathRenderer.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HWUI_PATH_RENDERER_H
+#define ANDROID_HWUI_PATH_RENDERER_H
+
+#include <utils/Vector.h>
+
+#include "Vertex.h"
+
+namespace android {
+namespace uirenderer {
+
+class Matrix4;
+typedef Matrix4 mat4;
+
+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 void computeInverseScales(
+        const mat4 *transform, float &inverseScaleX, float& inverseScaleY);
+
+    static void convexPathFillVertices(
+        const SkPath &path, const mat4 *transform,
+        VertexBuffer &vertexBuffer, bool isAA);
+
+private:
+    static void convexPathVertices(
+        const SkPath &path,
+        float thresholdx, float thresholdy,
+        Vector<Vertex> &outputVertices);
+
+/*
+  endpoints a & b,
+  control c
+ */
+    static void recursiveQuadraticBezierVertices(
+        float ax, float ay,
+        float bx, float by,
+        float cx, float cy,
+        float thresholdx, float thresholdy,
+        Vector<Vertex> &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 thresholdx, float thresholdy,
+        Vector<Vertex> &outputVertices);
+};
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_HWUI_PATH_RENDERER_H