1 // Copyright (C) 2013 Google Inc. All rights reserved. 2 // 3 // Redistribution and use in source and binary forms, with or without 4 // modification, are permitted provided that the following conditions are 5 // met: 6 // 7 // * Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above 10 // copyright notice, this list of conditions and the following disclaimer 11 // in the documentation and/or other materials provided with the 12 // distribution. 13 // * Neither the name of Google Inc. nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 #ifndef GraphicsContextStateSaver_h 30 #define GraphicsContextStateSaver_h 31 32 #include "core/platform/graphics/GraphicsContext.h" 33 34 namespace WebCore { 35 36 class GraphicsContextStateSaver { 37 WTF_MAKE_FAST_ALLOCATED; 38 public: 39 GraphicsContextStateSaver(GraphicsContext& context, bool saveAndRestore = true) 40 : m_context(context) 41 , m_saveAndRestore(saveAndRestore) 42 { 43 if (m_saveAndRestore) 44 m_context.save(); 45 } 46 47 ~GraphicsContextStateSaver() 48 { 49 if (m_saveAndRestore) 50 m_context.restore(); 51 } 52 53 void save() 54 { 55 ASSERT(!m_saveAndRestore); 56 m_context.save(); 57 m_saveAndRestore = true; 58 } 59 60 void restore() 61 { 62 ASSERT(m_saveAndRestore); 63 m_context.restore(); 64 m_saveAndRestore = false; 65 } 66 67 GraphicsContext* context() const { return &m_context; } 68 69 private: 70 GraphicsContext& m_context; 71 bool m_saveAndRestore; 72 }; 73 74 } // namespace WebCore 75 76 #endif // GraphicsContextStateSaver_h 77