third_party/WebKit/Source/platform/mac/LocalCurrentGraphicsContext.h

   1 /*
   2  * Copyright (C) 2006 Apple Computer, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "platform/PlatformExport.h"
  21 #include "platform/geometry/IntRect.h"
  22 #include "skia/ext/skia_utils_mac.h"
  23 #include "wtf/Noncopyable.h"
  24
  25 OBJC_CLASS NSGraphicsContext;
  26
  27 class SkCanvas;
  28
  29 namespace blink {
  30
  31 class GraphicsContext;
  32
  33 // This class automatically saves and restores the current NSGraphicsContext for
  34 // functions which call out into AppKit and rely on the currentContext being set
  35 class PLATFORM_EXPORT LocalCurrentGraphicsContext {
  36     WTF_MAKE_NONCOPYABLE(LocalCurrentGraphicsContext);
  37 public:
  38     LocalCurrentGraphicsContext(GraphicsContext*, const IntRect& dirtyRect);
  39     // Allows specifying an interest rect to which we clip if slimming paint is enabled and performance would benefit.
  40     LocalCurrentGraphicsContext(GraphicsContext*, const IntRect* interestRect, const IntRect& dirtyRect);
  41     LocalCurrentGraphicsContext(SkCanvas*, float deviceScaleFactor, const IntRect* interestRect, const IntRect& dirtyRect);
  42     ~LocalCurrentGraphicsContext();
  43     CGContextRef cgContext();
  44 private:
  45
  46     SkCanvas* m_savedCanvas;
  47     NSGraphicsContext* m_savedNSGraphicsContext;
  48     bool m_didSetGraphicsContext;
  49     IntRect m_inflatedDirtyRect;
  50     gfx::SkiaBitLocker m_skiaBitLocker;
  51 };
  52
  53 }