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      1 #ifndef GraphicsContextCullSaver_h
      2 #define GraphicsContextCullSaver_h
      3 
      4 #include "platform/graphics/GraphicsContext.h"
      5 
      6 namespace blink {
      7 
      8 class FloatRect;
      9 
     10 class GraphicsContextCullSaver {
     11     WTF_MAKE_FAST_ALLOCATED;
     12 public:
     13     GraphicsContextCullSaver(GraphicsContext& context)
     14         : m_context(context)
     15         , m_cullApplied(false)
     16     {
     17     }
     18 
     19     GraphicsContextCullSaver(GraphicsContext& context, const FloatRect& rect)
     20         : m_context(context)
     21         , m_cullApplied(true)
     22     {
     23         context.beginCull(rect);
     24     }
     25 
     26     ~GraphicsContextCullSaver()
     27     {
     28         if (m_cullApplied)
     29             m_context.endCull();
     30     }
     31 
     32     void cull(const FloatRect& rect)
     33     {
     34         ASSERT(!m_cullApplied);
     35         m_context.beginCull(rect);
     36         m_cullApplied = true;
     37     }
     38 
     39 private:
     40     GraphicsContext& m_context;
     41     bool m_cullApplied;
     42 };
     43 
     44 } // namespace blink
     45 
     46 #endif // GraphicsContextCullSaver_h
     47