| // 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) 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 |
