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 "platform/PlatformExport.h" 33 #include "platform/graphics/GraphicsContext.h" 34 35 namespace WebCore { 36 37 class PLATFORM_EXPORT GraphicsContextStateSaver { 38 WTF_MAKE_FAST_ALLOCATED; 39 public: 40 GraphicsContextStateSaver(GraphicsContext& context, bool saveAndRestore = true) m_context(context)41 : m_context(context) 42 , m_saveAndRestore(saveAndRestore) 43 { 44 if (m_saveAndRestore) 45 m_context.save(); 46 } 47 ~GraphicsContextStateSaver()48 ~GraphicsContextStateSaver() 49 { 50 if (m_saveAndRestore) 51 m_context.restore(); 52 } 53 save()54 void save() 55 { 56 ASSERT(!m_saveAndRestore); 57 m_context.save(); 58 m_saveAndRestore = true; 59 } 60 restore()61 void restore() 62 { 63 ASSERT(m_saveAndRestore); 64 m_context.restore(); 65 m_saveAndRestore = false; 66 } 67 context()68 GraphicsContext* context() const { return &m_context; } saved()69 bool saved() const { return m_saveAndRestore; } 70 71 private: 72 GraphicsContext& m_context; 73 bool m_saveAndRestore; 74 }; 75 76 } // namespace WebCore 77 78 #endif // GraphicsContextStateSaver_h 79