| // Copyright (C) 2013 Google Inc. All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRAPHICS_CONTEXT_STATE_SAVER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRAPHICS_CONTEXT_STATE_SAVER_H_ |
| |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/platform/graphics/graphics_context.h" |
| #include "third_party/blink/renderer/platform/platform_export.h" |
| #include "third_party/blink/renderer/platform/wtf/allocator/allocator.h" |
| |
| namespace blink { |
| |
| class PLATFORM_EXPORT GraphicsContextStateSaver final { |
| USING_FAST_MALLOC(GraphicsContextStateSaver); |
| |
| public: |
| GraphicsContextStateSaver(GraphicsContext& context, |
| bool save_and_restore = true) |
| : context_(context), save_and_restore_(save_and_restore) { |
| if (save_and_restore_) |
| context_.Save(); |
| } |
| |
| ~GraphicsContextStateSaver() { |
| if (save_and_restore_) |
| context_.Restore(); |
| } |
| |
| void Save() { |
| DCHECK(!save_and_restore_); |
| context_.Save(); |
| save_and_restore_ = true; |
| } |
| |
| void SaveIfNeeded() { |
| if (Saved()) |
| return; |
| Save(); |
| } |
| |
| void Restore() { |
| DCHECK(save_and_restore_); |
| context_.Restore(); |
| save_and_restore_ = false; |
| } |
| |
| GraphicsContext& Context() const { return context_; } |
| bool Saved() const { return save_and_restore_; } |
| |
| private: |
| GraphicsContext& context_; |
| bool save_and_restore_; |
| |
| DISALLOW_COPY_AND_ASSIGN(GraphicsContextStateSaver); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRAPHICS_CONTEXT_STATE_SAVER_H_ |