55bfb4e728
Basically we compute the shadow as a strip of triangles, whose alpha value is the strength of the shadow. We use the normal to extend the geometry. And we use static function and try to avoid new/malloc in the computation. Change-Id: I382286f1cad351bd5ff983f76f446c075819dcaf
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_HWUI_PATH_TESSELLATOR_H
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#define ANDROID_HWUI_PATH_TESSELLATOR_H
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#include <utils/Vector.h>
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#include "Matrix.h"
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#include "Rect.h"
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#include "Vertex.h"
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#include "VertexBuffer.h"
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namespace android {
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namespace uirenderer {
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class PathTessellator {
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public:
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static void expandBoundsForStroke(SkRect& bounds, const SkPaint* paint);
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static void tessellatePath(const SkPath& path, const SkPaint* paint,
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const mat4 *transform, VertexBuffer& vertexBuffer);
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static void tessellatePoints(const float* points, int count, SkPaint* paint,
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const mat4* transform, SkRect& bounds, VertexBuffer& vertexBuffer);
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static void tessellateLines(const float* points, int count, SkPaint* paint,
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const mat4* transform, SkRect& bounds, VertexBuffer& vertexBuffer);
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private:
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static bool approximatePathOutlineVertices(const SkPath &path, bool forceClose,
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float sqrInvScaleX, float sqrInvScaleY, Vector<Vertex> &outputVertices);
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/*
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endpoints a & b,
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control c
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*/
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static void recursiveQuadraticBezierVertices(
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float ax, float ay,
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float bx, float by,
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float cx, float cy,
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float sqrInvScaleX, float sqrInvScaleY,
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Vector<Vertex> &outputVertices);
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/*
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endpoints p1, p2
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control c1, c2
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*/
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static void recursiveCubicBezierVertices(
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float p1x, float p1y,
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float c1x, float c1y,
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float p2x, float p2y,
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float c2x, float c2y,
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float sqrInvScaleX, float sqrInvScaleY,
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Vector<Vertex> &outputVertices);
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};
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_PATH_TESSELLATOR_H
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