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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 <utils/Blur.h>
#include <SkColorFilter.h>
#include <SkDrawLooper.h>
#include <SkShader.h>
#include <SkXfermode.h>
namespace android {
namespace uirenderer {
/**
* Utility methods for accessing data within SkPaint, and providing defaults
* with optional SkPaint pointers.
*/
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;
}
static inline GLenum getFilter(const SkPaint* paint) {
if (!paint || paint->getFilterQuality() != kNone_SkFilterQuality) {
return GL_LINEAR;
}
return GL_NEAREST;
}
// 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 isOpaquePaint(const SkPaint* paint) {
if (!paint) return true; // default (paintless) behavior is SrcOver, black
if (paint->getAlpha() != 0xFF
|| PaintUtils::isBlendedShader(paint->getShader())
|| PaintUtils::isBlendedColorFilter(paint->getColorFilter())) {
return false;
}
// Only let simple srcOver / src blending modes declare opaque, since behavior is clear.
SkXfermode::Mode mode = getXfermode(paint->getXfermode());
return mode == SkXfermode::Mode::kSrcOver_Mode
|| mode == SkXfermode::Mode::kSrc_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;
}
struct TextShadow {
SkScalar radius;
float dx;
float dy;
SkColor color;
};
static inline bool getTextShadow(const SkPaint* paint, TextShadow* textShadow) {
SkDrawLooper::BlurShadowRec blur;
if (paint && paint->getLooper() && paint->getLooper()->asABlurShadow(&blur)) {
if (textShadow) {
textShadow->radius = Blur::convertSigmaToRadius(blur.fSigma);
textShadow->dx = blur.fOffset.fX;
textShadow->dy = blur.fOffset.fY;
textShadow->color = blur.fColor;
}
return true;
}
return false;
}
static inline bool hasTextShadow(const SkPaint* paint) {
return getTextShadow(paint, nullptr);
}
static inline SkXfermode::Mode getXfermodeDirect(const SkPaint* paint) {
return paint ? getXfermode(paint->getXfermode()) : SkXfermode::kSrcOver_Mode;
}
static inline int getAlphaDirect(const SkPaint* paint) {
return paint ? paint->getAlpha() : 255;
}
}; // class PaintUtils
} /* namespace uirenderer */
} /* namespace android */
#endif /* PAINT_UTILS_H */
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