82 lines
2.6 KiB
C++
82 lines
2.6 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 <SkColorFilter.h>
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#include <SkXfermode.h>
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namespace android {
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namespace uirenderer {
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class PaintUtils {
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public:
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/**
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* Safely retrieves the mode from the specified xfermode. If the specified
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* xfermode is null, the mode is assumed to be SkXfermode::kSrcOver_Mode.
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*/
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static inline SkXfermode::Mode getXfermode(SkXfermode* mode) {
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SkXfermode::Mode resultMode;
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if (!SkXfermode::AsMode(mode, &resultMode)) {
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resultMode = SkXfermode::kSrcOver_Mode;
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}
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return resultMode;
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}
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static inline GLenum getFilter(const SkPaint* paint) {
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if (!paint || paint->getFilterLevel() != SkPaint::kNone_FilterLevel) {
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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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// TODO: move to a method on android:Paint? replace with SkPaint::nothingToDraw()?
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static inline bool paintWillNotDraw(const SkPaint& paint) {
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return paint.getAlpha() == 0
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&& !paint.getColorFilter()
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&& getXfermode(paint.getXfermode()) == SkXfermode::kSrcOver_Mode;
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}
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// TODO: move to a method on android:Paint? replace with SkPaint::nothingToDraw()?
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static inline bool paintWillNotDrawText(const SkPaint& paint) {
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return paint.getAlpha() == 0
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&& paint.getLooper() == nullptr
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&& !paint.getColorFilter()
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&& getXfermode(paint.getXfermode()) == SkXfermode::kSrcOver_Mode;
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}
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static bool isBlendedShader(const SkShader* shader) {
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if (shader == nullptr) {
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return false;
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}
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return !shader->isOpaque();
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}
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static bool isBlendedColorFilter(const SkColorFilter* filter) {
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if (filter == nullptr) {
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return false;
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}
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return (filter->getFlags() & SkColorFilter::kAlphaUnchanged_Flag) == 0;
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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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