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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 <SkAndroidFrameworkUtils.h>
#include <SkBlendMode.h>
#include <SkColorFilter.h>
#include <SkGradientShader.h>
#include <SkHighContrastFilter.h>
#include <SkPaint.h>
#include <SkShader.h>
#include <log/log.h>
#include <algorithm>
#include <cmath>
#include "Properties.h"
#include "utils/Color.h"
namespace android::uirenderer {
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;
}
}
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;
}
}
SkColor invert(SkColor color) {
Lab lab = sRGBToLab(color);
lab.L = 100 - lab.L;
return LabToSRGB(lab, SkColorGetA(color));
}
SkColor transformColor(ColorTransform transform, SkColor color) {
switch (transform) {
case ColorTransform::Light:
return makeLight(color);
case ColorTransform::Dark:
return makeDark(color);
case ColorTransform::Invert:
return invert(color);
default:
return color;
}
}
SkColor transformColorInverse(ColorTransform transform, SkColor color) {
switch (transform) {
case ColorTransform::Dark:
return makeLight(color);
case ColorTransform::Light:
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.getShader()) {
SkAndroidFrameworkUtils::LinearGradientInfo info;
std::array<SkColor, 10> _colorStorage;
std::array<SkScalar, _colorStorage.size()> _offsetStorage;
info.fColorCount = _colorStorage.size();
info.fColors = _colorStorage.data();
info.fColorOffsets = _offsetStorage.data();
if (SkAndroidFrameworkUtils::ShaderAsALinearGradient(paint.getShader(), &info) &&
info.fColorCount <= _colorStorage.size()) {
for (int i = 0; i < info.fColorCount; i++) {
info.fColors[i] = transformColor(transform, info.fColors[i]);
}
paint.setShader(SkGradientShader::MakeLinear(
info.fPoints, info.fColors, info.fColorOffsets, info.fColorCount,
info.fTileMode, info.fGradientFlags, nullptr));
} else {
if (transform == ColorTransform::Invert) {
// Since we're trying to invert every thing around this draw call, we invert
// the color of the draw call if we don't know what it is.
auto filter = SkHighContrastFilter::Make(
{/* grayscale= */ false,
SkHighContrastConfig::InvertStyle::kInvertLightness,
/* contrast= */ 0.0f});
if (paint.getColorFilter()) {
paint.setColorFilter(SkColorFilters::Compose(filter, paint.refColorFilter()));
} else {
paint.setColorFilter(filter);
}
return;
}
}
}
if (paint.getColorFilter()) {
SkBlendMode mode;
SkColor color;
// TODO: LRU this or something to avoid spamming new color mode filters
if (paint.getColorFilter()->asAColorMode(&color, &mode)) {
color = transformColor(transform, color);
paint.setColorFilter(SkColorFilters::Blend(color, mode));
}
}
}
static BitmapPalette paletteForColorHSV(SkColor color) {
float hsv[3];
SkColorToHSV(color, hsv);
return hsv[2] >= .5f ? BitmapPalette::Light : BitmapPalette::Dark;
}
static BitmapPalette filterPalette(const SkPaint* paint, BitmapPalette palette) {
if (palette == BitmapPalette::Unknown || !paint || !paint->getColorFilter()) {
return palette;
}
SkColor4f color = palette == BitmapPalette::Light ? SkColors::kWhite : SkColors::kBlack;
sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
color = paint->getColorFilter()->filterColor4f(color, srgb.get(), srgb.get());
return paletteForColorHSV(color.toSkColor());
}
bool transformPaint(ColorTransform transform, SkPaint* paint) {
// TODO
applyColorTransform(transform, *paint);
return true;
}
bool transformPaint(ColorTransform transform, SkPaint* paint, BitmapPalette palette) {
bool shouldInvert = false;
if (transform == ColorTransform::Invert && palette != BitmapPalette::Colorful) {
// When the transform is Invert we invert any image that is not deemed "colorful",
// regardless of calculated image brightness.
shouldInvert = true;
}
palette = filterPalette(paint, palette);
if (palette == BitmapPalette::Light && transform == ColorTransform::Dark) {
shouldInvert = true;
}
if (palette == BitmapPalette::Dark && transform == ColorTransform::Light) {
shouldInvert = true;
}
if (shouldInvert) {
SkHighContrastConfig config;
config.fInvertStyle = SkHighContrastConfig::InvertStyle::kInvertLightness;
paint->setColorFilter(SkHighContrastFilter::Make(config)->makeComposed(paint->refColorFilter()));
}
return shouldInvert;
}
} // namespace android::uirenderer
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