75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/*
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* Copyright (C) 2014 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 PAINT_UTILS_H
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#define PAINT_UTILS_H
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#include <GLES2/gl2.h>
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#include <utils/Blur.h>
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#include <SkColorFilter.h>
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#include <SkPaint.h>
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#include <SkShader.h>
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namespace android {
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namespace uirenderer {
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/**
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* Utility methods for accessing data within SkPaint, and providing defaults
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* with optional SkPaint pointers.
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*/
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class PaintUtils {
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public:
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static inline GLenum getFilter(const SkPaint* paint) {
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if (!paint || paint->getFilterQuality() != kNone_SkFilterQuality) {
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return GL_LINEAR;
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}
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return GL_NEAREST;
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}
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static bool isOpaquePaint(const SkPaint* paint) {
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if (!paint) return true; // default (paintless) behavior is SrcOver, black
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if (paint->getAlpha() != 0xFF || PaintUtils::isBlendedShader(paint->getShader()) ||
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PaintUtils::isBlendedColorFilter(paint->getColorFilter())) {
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return false;
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}
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// Only let simple srcOver / src blending modes declare opaque, since behavior is clear.
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SkBlendMode mode = paint->getBlendMode();
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return mode == SkBlendMode::kSrcOver || mode == SkBlendMode::kSrc;
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}
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static bool isBlendedShader(const SkShader* shader) { return shader && !shader->isOpaque(); }
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static bool isBlendedColorFilter(const SkColorFilter* filter) {
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return filter && !filter->isAlphaUnchanged();
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}
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static inline SkBlendMode getBlendModeDirect(const SkPaint* paint) {
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return paint ? paint->getBlendMode() : SkBlendMode::kSrcOver;
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}
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static inline int getAlphaDirect(const SkPaint* paint) {
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return paint ? paint->getAlpha() : 255;
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}
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}; // class PaintUtils
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} /* namespace uirenderer */
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} /* namespace android */
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#endif /* PAINT_UTILS_H */
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