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/*
* Copyright (C) 2018 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.
*/
#include "CanvasTransform.h"
#include "utils/Color.h"
#include "Properties.h"
#include <ui/ColorSpace.h>
#include <SkColorFilter.h>
#include <SkPaint.h>
#include <algorithm>
#include <cmath>
namespace android::uirenderer {
static SkColor makeLight(SkColor color) {
Lab lab = sRGBToLab(color);
float invertedL = std::min(110 - lab.L, 100.0f);
if (invertedL > lab.L) {
lab.L = invertedL;
return LabToSRGB(lab, SkColorGetA(color));
} else {
return color;
}
}
static SkColor makeDark(SkColor color) {
Lab lab = sRGBToLab(color);
float invertedL = std::min(110 - lab.L, 100.0f);
if (invertedL < lab.L) {
lab.L = invertedL;
return LabToSRGB(lab, SkColorGetA(color));
} else {
return color;
}
}
static SkColor transformColor(ColorTransform transform, SkColor color) {
switch (transform) {
case ColorTransform::Light:
return makeLight(color);
case ColorTransform::Dark:
return makeDark(color);
default:
return color;
}
}
static void applyColorTransform(ColorTransform transform, SkPaint& paint) {
if (transform == ColorTransform::None) return;
SkColor newColor = transformColor(transform, paint.getColor());
paint.setColor(newColor);
if (paint.getColorFilter()) {
SkBlendMode mode;
SkColor color;
// TODO: LRU this or something to avoid spamming new color mode filters
if (paint.getColorFilter()->asColorMode(&color, &mode)) {
color = transformColor(transform, color);
paint.setColorFilter(SkColorFilter::MakeModeFilter(color, mode));
}
}
}
class ColorFilterCanvas : public SkPaintFilterCanvas {
public:
ColorFilterCanvas(ColorTransform transform, SkCanvas* canvas)
: SkPaintFilterCanvas(canvas), mTransform(transform) {}
bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type type) const override {
if (*paint) {
applyColorTransform(mTransform, *(paint->writable()));
}
return true;
}
private:
ColorTransform mTransform;
};
std::unique_ptr<SkCanvas> makeTransformCanvas(SkCanvas* inCanvas, ColorTransform transform) {
switch (transform) {
case ColorTransform::Light:
return std::make_unique<ColorFilterCanvas>(ColorTransform::Light, inCanvas);
case ColorTransform::Dark:
return std::make_unique<ColorFilterCanvas>(ColorTransform::Dark, inCanvas);
default:
return nullptr;
}
}
std::unique_ptr<SkCanvas> makeTransformCanvas(SkCanvas* inCanvas, UsageHint usageHint) {
if (Properties::forceDarkMode) {
switch (usageHint) {
case UsageHint::Unknown:
return makeTransformCanvas(inCanvas, ColorTransform::Light);
case UsageHint::Background:
return makeTransformCanvas(inCanvas, ColorTransform::Dark);
}
}
return nullptr;
}
}; // namespace android::uirenderer
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