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/*
* Copyright (C) 2014 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 PAINT_UTILS_H
#define PAINT_UTILS_H
#include <SkColorFilter.h>
#include <SkXfermode.h>
namespace android {
namespace uirenderer {
class PaintUtils {
public:
/**
* Safely retrieves the mode from the specified xfermode. If the specified
* xfermode is null, the mode is assumed to be SkXfermode::kSrcOver_Mode.
*/
static inline SkXfermode::Mode getXfermode(SkXfermode* mode) {
SkXfermode::Mode resultMode;
if (!SkXfermode::AsMode(mode, &resultMode)) {
resultMode = SkXfermode::kSrcOver_Mode;
}
return resultMode;
}
// TODO: move to a method on android:Paint? replace with SkPaint::nothingToDraw()?
static inline bool paintWillNotDraw(const SkPaint& paint) {
return paint.getAlpha() == 0
&& !paint.getColorFilter()
&& getXfermode(paint.getXfermode()) == SkXfermode::kSrcOver_Mode;
}
// TODO: move to a method on android:Paint? replace with SkPaint::nothingToDraw()?
static inline bool paintWillNotDrawText(const SkPaint& paint) {
return paint.getAlpha() == 0
&& paint.getLooper() == nullptr
&& !paint.getColorFilter()
&& getXfermode(paint.getXfermode()) == SkXfermode::kSrcOver_Mode;
}
static bool isBlendedShader(const SkShader* shader) {
if (shader == nullptr) {
return false;
}
return !shader->isOpaque();
}
static bool isBlendedColorFilter(const SkColorFilter* filter) {
if (filter == nullptr) {
return false;
}
return (filter->getFlags() & SkColorFilter::kAlphaUnchanged_Flag) == 0;
}
}; // class PaintUtils
} /* namespace uirenderer */
} /* namespace android */
#endif /* PAINT_UTILS_H */
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