blob: d1d8d3417833023d7afeb244ea6bb562927a7780 [file] [log] [blame]
// 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 "ui/color/color_provider.h"
#include <utility>
#include "ui/color/color_mixer.h"
#include "ui/gfx/color_palette.h"
namespace ui {
ColorMixer* ColorProvider::AddMixer() {
// Adding a mixer could change any of the result colors.
cache_.clear();
// Supply each new mixer with the previous mixer in the pipeline; this way
// GetColor() need not query each mixer in order, but simply ask the last
// mixer for its result, and trust mixers to query each other back up the
// chain as needed.
mixers_.emplace_front(mixers_.empty() ? nullptr : &mixers_.front());
return &mixers_.front();
}
SkColor ColorProvider::GetColor(ColorId id, ColorVariant variant) const {
DCHECK_COLOR_ID_VALID(id);
if (mixers_.empty())
return gfx::kPlaceholderColor;
// Only compute the result color when it's not already in the cache.
auto i = cache_.find(id);
if (i == cache_.end())
i = cache_.insert({id, mixers_.front().GetResultColor(id)}).first;
return i->second;
}
ColorProvider::ColorProvider() = default;
ColorProvider::~ColorProvider() = default;
} // namespace ui