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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/graphics/dark_mode_filter.h"
#include <cmath>
#include "base/check_op.h"
#include "base/notreached.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/blink/renderer/platform/graphics/dark_mode_color_classifier.h"
#include "third_party/blink/renderer/platform/graphics/dark_mode_color_filter.h"
#include "third_party/blink/renderer/platform/graphics/dark_mode_image_classifier.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "third_party/blink/renderer/platform/wtf/lru_cache.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/effects/SkColorMatrix.h"
namespace blink {
namespace {
const size_t kMaxCacheSize = 1024u;
const int kMinImageLength = 8;
const int kMaxImageLength = 100;
// TODO(gilmanmh): If grayscaling images in dark mode proves popular among
// users, consider experimenting with different grayscale algorithms.
sk_sp<SkColorFilter> MakeGrayscaleFilter(float grayscale_percent) {
DCHECK_GE(grayscale_percent, 0.0f);
DCHECK_LE(grayscale_percent, 1.0f);
SkColorMatrix grayscale_matrix;
grayscale_matrix.setSaturation(1.0f - grayscale_percent);
return SkColorFilters::Matrix(grayscale_matrix);
}
} // namespace
// DarkModeInvertedColorCache - Implements cache for inverted colors.
class DarkModeInvertedColorCache {
public:
DarkModeInvertedColorCache() : cache_(kMaxCacheSize) {}
~DarkModeInvertedColorCache() = default;
SkColor GetInvertedColor(DarkModeColorFilter* filter, SkColor color) {
WTF::IntegralWithAllKeys<SkColor> key(color);
SkColor* cached_value = cache_.Get(key);
if (cached_value)
return *cached_value;
SkColor inverted_color = filter->InvertColor(color);
cache_.Put(key, static_cast<SkColor>(inverted_color));
return inverted_color;
}
void Clear() { cache_.Clear(); }
size_t size() { return cache_.size(); }
private:
WTF::LruCache<WTF::IntegralWithAllKeys<SkColor>, SkColor> cache_;
};
DarkModeFilter::DarkModeFilter(const DarkModeSettings& settings)
: immutable_(settings),
inverted_color_cache_(new DarkModeInvertedColorCache()) {}
DarkModeFilter::~DarkModeFilter() {}
DarkModeFilter::ImmutableData::ImmutableData(const DarkModeSettings& settings)
: settings(settings),
text_classifier(nullptr),
background_classifier(nullptr),
image_classifier(nullptr),
color_filter(nullptr),
image_filter(nullptr) {
color_filter = DarkModeColorFilter::FromSettings(settings);
if (!color_filter)
return;
if (settings.image_grayscale_percent > 0.0f)
image_filter = MakeGrayscaleFilter(settings.image_grayscale_percent);
else
image_filter = color_filter->ToSkColorFilter();
text_classifier = DarkModeColorClassifier::MakeTextColorClassifier(settings);
background_classifier =
DarkModeColorClassifier::MakeBackgroundColorClassifier(settings);
image_classifier = std::make_unique<DarkModeImageClassifier>();
}
SkColor DarkModeFilter::InvertColorIfNeeded(SkColor color, ElementRole role) {
if (!immutable_.color_filter)
return color;
if (role_override_.has_value())
role = role_override_.value();
if (ShouldApplyToColor(color, role)) {
return inverted_color_cache_->GetInvertedColor(
immutable_.color_filter.get(), color);
}
return color;
}
DarkModeResult DarkModeFilter::AnalyzeShouldApplyToImage(
const SkIRect& src,
const SkIRect& dst) const {
if (immutable_.settings.image_policy == DarkModeImagePolicy::kFilterNone)
return DarkModeResult::kDoNotApplyFilter;
if (immutable_.settings.image_policy == DarkModeImagePolicy::kFilterAll)
return DarkModeResult::kApplyFilter;
// Images being drawn from very smaller |src| rect, i.e. one of the dimensions
// is very small, can be used for the border around the content or showing
// separator. Consider these images irrespective of size of the rect being
// drawn to. Classifying them will not be too costly.
if (src.width() <= kMinImageLength || src.height() <= kMinImageLength)
return DarkModeResult::kNotClassified;
// Do not consider images being drawn into bigger rect as these images are not
// meant for icons or representing smaller widgets. These images are
// considered as photos which should be untouched.
return (dst.width() <= kMaxImageLength && dst.height() <= kMaxImageLength)
? DarkModeResult::kNotClassified
: DarkModeResult::kDoNotApplyFilter;
}
sk_sp<SkColorFilter> DarkModeFilter::ApplyToImage(const SkPixmap& pixmap,
const SkIRect& src) const {
DCHECK(immutable_.settings.image_policy == DarkModeImagePolicy::kFilterSmart);
DCHECK(immutable_.image_filter);
return (immutable_.image_classifier->Classify(pixmap, src) ==
DarkModeResult::kApplyFilter)
? immutable_.image_filter
: nullptr;
}
sk_sp<SkColorFilter> DarkModeFilter::GetImageFilter() const {
DCHECK(immutable_.image_filter);
return immutable_.image_filter;
}
absl::optional<cc::PaintFlags> DarkModeFilter::ApplyToFlagsIfNeeded(
const cc::PaintFlags& flags,
ElementRole role) {
if (!immutable_.color_filter)
return absl::nullopt;
if (role_override_.has_value())
role = role_override_.value();
cc::PaintFlags dark_mode_flags = flags;
if (flags.HasShader()) {
PaintShader::Type shader_type = flags.getShader()->shader_type();
if (shader_type != PaintShader::Type::kImage &&
shader_type != PaintShader::Type::kPaintRecord) {
dark_mode_flags.setColorFilter(
immutable_.color_filter->ToSkColorFilter());
}
} else if (ShouldApplyToColor(flags.getColor(), role)) {
dark_mode_flags.setColor(inverted_color_cache_->GetInvertedColor(
immutable_.color_filter.get(), flags.getColor()));
}
return absl::make_optional<cc::PaintFlags>(std::move(dark_mode_flags));
}
bool DarkModeFilter::ShouldApplyToColor(SkColor color, ElementRole role) {
switch (role) {
case ElementRole::kSVG:
case ElementRole::kText:
DCHECK(immutable_.text_classifier);
return immutable_.text_classifier->ShouldInvertColor(color) ==
DarkModeResult::kApplyFilter;
case ElementRole::kListSymbol:
// TODO(prashant.n): Rename text_classifier to foreground_classifier,
// so that same classifier can be used for all roles which are supposed
// to be at foreground.
DCHECK(immutable_.text_classifier);
return immutable_.text_classifier->ShouldInvertColor(color) ==
DarkModeResult::kApplyFilter;
case ElementRole::kBackground:
DCHECK(immutable_.background_classifier);
return immutable_.background_classifier->ShouldInvertColor(color) ==
DarkModeResult::kApplyFilter;
default:
return false;
}
NOTREACHED();
}
size_t DarkModeFilter::GetInvertedColorCacheSizeForTesting() {
return inverted_color_cache_->size();
}
ScopedDarkModeElementRoleOverride::ScopedDarkModeElementRoleOverride(
GraphicsContext* graphics_context,
DarkModeFilter::ElementRole role)
: graphics_context_(graphics_context) {
previous_role_override_ =
graphics_context_->GetDarkModeFilter()->role_override_;
graphics_context_->GetDarkModeFilter()->role_override_ = role;
}
ScopedDarkModeElementRoleOverride::~ScopedDarkModeElementRoleOverride() {
graphics_context_->GetDarkModeFilter()->role_override_ =
previous_role_override_;
}
} // namespace blink
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