Merges in updated versions of Mac graphics platform classes, adds generic typedefs for use by higher level classes that just need to hold a reference (though does not yet refactor those classes).

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1099 0039d316-1c4b-4281-b951-d872f2087c98

14 files changed, 1332 insertions, 1 deletions

diff --git a/base/gfx/bitmap_platform_device.h b/base/gfx/bitmap_platform_device.h
new file mode 100644
index 0000000..7d34995
--- /dev/null
+++ b/base/gfx/bitmap_platform_device.h
@@ -0,0 +1,40 @@
+// Copyright 2008, 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.
+
+// Declare a platform-neutral name for this platform's bitmap device class
+// that can be used by upper-level classes that just need to pass a reference
+// around.
+
+#if defined(OS_WIN)
+class BitmapPlatformDeviceWin;
+typedef BitmapPlatformDeviceWin BitmapPlatformDevice;
+#elif defined(OS_MACOSX)
+class BitmapPlatformDeviceMac;
+typedef BitmapPlatformDeviceMac BitmapPlatformDevice;
+#endif
diff --git a/base/gfx/bitmap_platform_device_mac.cc b/base/gfx/bitmap_platform_device_mac.cc
new file mode 100755
index 0000000..c87a8f0
--- /dev/null
+++ b/base/gfx/bitmap_platform_device_mac.cc
@@ -0,0 +1,330 @@
+// Copyright 2008, 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.
+
+#include <time.h>
+
+#include "SkMatrix.h"
+#include "SkRegion.h"
+#include "SkUtils.h"
+
+#include "base/gfx/bitmap_platform_device_mac.h"
+#include "base/gfx/skia_utils_mac.h"
+#include "base/logging.h"
+
+namespace gfx {
+
+namespace {
+
+// Constrains position and size to fit within available_size. If |size| is -1,
+// all the |available_size| is used. Returns false if the position is out of
+// |available_size|.
+bool Constrain(int available_size, int* position, int *size) {
+  if (*size < -2)
+    return false;
+  
+  if (*position < 0) {
+    if (*size != -1)
+      *size += *position;
+    *position = 0;
+  }
+  if (*size == 0 || *position >= available_size)
+    return false;
+  
+  if (*size > 0) {
+    int overflow = (*position + *size) - available_size;
+    if (overflow > 0) {
+      *size -= overflow;
+    }
+  } else {
+    // Fill up available size.
+    *size = available_size - *position;
+  }
+  return true;
+}
+
+} // namespace
+
+class BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData
+    : public base::RefCounted<BitmapPlatformDeviceMacData> {
+ public:
+  explicit BitmapPlatformDeviceMacData(CGContextRef bitmap);
+
+  // Create/destroy CoreGraphics context for our bitmap data.
+  CGContextRef GetBitmapContext() {
+    return bitmap_context_;
+  }
+
+  void ReleaseBitmapContext() {
+    DCHECK(bitmap_context_);
+    CGContextRelease(bitmap_context_);
+    bitmap_context_ = NULL;
+  }
+
+  // Sets the transform and clip operations. This will not update the CGContext,
+  // but will mark the config as dirty. The next call of LoadConfig will
+  // pick up these changes.
+  void SetTransform(const SkMatrix& t);
+  void SetClipRegion(const SkRegion& region);
+
+  // Loads the current transform (taking into account offset_*_) and clip
+  // into the DC. Can be called even when |bitmap_context_| is NULL (will be
+  // a NOP).
+  void LoadConfig();
+
+  // Lazily-created graphics context used to draw into the bitmap.
+  CGContextRef bitmap_context_;
+
+  // Additional offset applied to the transform. See setDeviceOffset().
+  int offset_x_;
+  int offset_y_;
+
+  // True when there is a transform or clip that has not been set to the
+  // CGContext.  The CGContext is retrieved for every text operation, and the
+  // transform and clip do not change as much. We can save time by not loading
+  // the clip and transform for every one.
+  bool config_dirty_;
+
+  // Translation assigned to the CGContext: we need to keep track of this
+  // separately so it can be updated even if the CGContext isn't created yet.
+  SkMatrix transform_;
+
+  // The current clipping
+  SkRegion clip_region_;
+
+ private:
+  friend class base::RefCounted<BitmapPlatformDeviceMacData>;
+  ~BitmapPlatformDeviceMacData() {
+    if (bitmap_context_)
+      CGContextRelease(bitmap_context_);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDeviceMacData);
+};
+
+BitmapPlatformDeviceMac::\
+    BitmapPlatformDeviceMacData::BitmapPlatformDeviceMacData(
+    CGContextRef bitmap)
+    : bitmap_context_(bitmap),
+      offset_x_(0),
+      offset_y_(0),
+      config_dirty_(true) {  // Want to load the config next time.
+  DCHECK(bitmap_context_);
+  // Initialize the clip region to the entire bitmap.  
+  
+  SkIRect rect;
+  rect.set(0, 0,
+           CGBitmapContextGetWidth(bitmap_context_),
+           CGBitmapContextGetHeight(bitmap_context_));
+  SkRegion region(rect);
+  SetClipRegion(region);
+  CGContextRetain(bitmap_context_);
+}
+
+void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::SetTransform(
+    const SkMatrix& t) {
+  transform_ = t;
+  config_dirty_ = true;
+}
+
+void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::SetClipRegion(
+    const SkRegion& region) {
+  clip_region_ = region;
+  config_dirty_ = true;
+}
+
+void BitmapPlatformDeviceMac::BitmapPlatformDeviceMacData::LoadConfig() {
+  if (!config_dirty_ || !bitmap_context_)
+    return;  // Nothing to do.
+  config_dirty_ = false;
+
+  // Transform.
+  SkMatrix t(transform_);
+  t.postTranslate(SkIntToScalar(-offset_x_), SkIntToScalar(-offset_y_));
+  LoadTransformToCGContext(bitmap_context_, t);
+
+  // TODO(brettw) we should support more than just rect clipping here.
+  SkIRect rect = clip_region_.getBounds();
+  rect.offset(-offset_x_, -offset_y_);
+
+  CGContextClipToRect(bitmap_context_, SkIRectToCGRect(rect));
+}
+
+
+// We use this static factory function instead of the regular constructor so
+// that we can create the pixel data before calling the constructor. This is
+// required so that we can call the base class' constructor with the pixel
+// data.
+BitmapPlatformDeviceMac* BitmapPlatformDeviceMac::Create(CGContextRef context,
+                                                         int width,
+                                                         int height,
+                                                         bool is_opaque) {
+  // each pixel is 4 bytes (RGBA):
+  void* data = malloc(height * width * 4);
+  if (!data) return NULL;
+
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+  bitmap.setPixels(data);
+  bitmap.setIsOpaque(is_opaque);
+
+  if (is_opaque) {
+#ifndef NDEBUG
+    // To aid in finding bugs, we set the background color to something
+    // obviously wrong so it will be noticable when it is not cleared
+    bitmap.eraseARGB(255, 0, 255, 128);  // bright bluish green
+#endif
+  }
+  
+  CGColorSpaceRef color_space =
+    CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+  // allocate a bitmap context with 4 components per pixel (RGBA):
+  CGContextRef bitmap_context =
+    CGBitmapContextCreate(data, width, height, 8, width*4,
+                          color_space, kCGImageAlphaPremultipliedLast);
+  // change the coordinate system to match WebCore's
+  CGContextTranslateCTM(bitmap_context, 0, height);
+  CGContextScaleCTM(bitmap_context, 1.0, -1.0);
+  CGColorSpaceRelease(color_space);
+
+  // The device object will take ownership of the graphics context.
+  return new BitmapPlatformDeviceMac(
+      new BitmapPlatformDeviceMacData(bitmap_context), bitmap);
+}
+
+// The device will own the bitmap, which corresponds to also owning the pixel
+// data. Therefore, we do not transfer ownership to the SkDevice's bitmap.
+BitmapPlatformDeviceMac::BitmapPlatformDeviceMac(
+    BitmapPlatformDeviceMacData* data, const SkBitmap& bitmap)
+    : PlatformDeviceMac(bitmap),
+      data_(data) {
+}
+
+// The copy constructor just adds another reference to the underlying data.
+// We use a const cast since the default Skia definitions don't define the
+// proper constedness that we expect (accessBitmap should really be const).
+BitmapPlatformDeviceMac::BitmapPlatformDeviceMac(
+    const BitmapPlatformDeviceMac& other)
+    : PlatformDeviceMac(
+          const_cast<BitmapPlatformDeviceMac&>(other).accessBitmap(true)),
+      data_(other.data_) {
+}
+
+BitmapPlatformDeviceMac::~BitmapPlatformDeviceMac() {
+}
+
+BitmapPlatformDeviceMac& BitmapPlatformDeviceMac::operator=(
+    const BitmapPlatformDeviceMac& other) {
+  data_ = other.data_;
+  return *this;
+}
+
+CGContextRef BitmapPlatformDeviceMac::GetBitmapContext() {
+  return data_->GetBitmapContext();
+}
+
+void BitmapPlatformDeviceMac::SetTransform(const SkMatrix& matrix) {
+  data_->SetTransform(matrix);
+}
+
+void BitmapPlatformDeviceMac::SetDeviceOffset(int x, int y) {
+  data_->offset_x_ = x;
+  data_->offset_y_ = y;
+}
+
+void BitmapPlatformDeviceMac::SetClipRegion(const SkRegion& region) {
+  data_->SetClipRegion(region);
+}
+
+void BitmapPlatformDeviceMac::DrawToContext(CGContextRef context, int x, int y,
+                                            const CGRect* src_rect) {
+  bool created_dc = false;
+  if (!data_->bitmap_context_) {
+    created_dc = true;
+    GetBitmapContext();
+  }
+
+  // this should not make a copy of the bits, since we're not doing
+  // anything to trigger copy on write
+  CGImageRef image = CGBitmapContextCreateImage(data_->bitmap_context_);
+  CGRect bounds;
+  if (src_rect) {
+    bounds = *src_rect;
+    bounds.origin.x = x;
+    bounds.origin.y = y;
+    CGImageRef sub_image = CGImageCreateWithImageInRect(image, *src_rect);
+    CGContextDrawImage(context, bounds, sub_image);
+    CGImageRelease(sub_image);
+  } else {
+    bounds.origin.x = 0;
+    bounds.origin.y = 0;
+    bounds.size.width = width();
+    bounds.size.height = height();
+    CGContextDrawImage(context, bounds, image);
+  }
+  CGImageRelease(image);
+
+  if (created_dc)
+    data_->ReleaseBitmapContext();
+}
+
+void BitmapPlatformDeviceMac::processPixels(int x, int y,
+                                            int width, int height, 
+                                            adjustAlpha adjustor) {
+  const SkBitmap& bitmap = accessBitmap(true);
+  SkMatrix& matrix = data_->transform_;
+  int bitmap_start_x = SkScalarRound(matrix.getTranslateX()) + x;
+  int bitmap_start_y = SkScalarRound(matrix.getTranslateY()) + y;
+
+  SkAutoLockPixels lock(bitmap);
+  if (Constrain(bitmap.width(), &bitmap_start_x, &width) &&
+      Constrain(bitmap.height(), &bitmap_start_y, &height)) {
+    uint32_t* data = bitmap.getAddr32(0, 0);
+    size_t row_words = bitmap.rowBytes() / 4;
+    for (int i = 0; i < height; i++) {
+      size_t offset = (i + bitmap_start_y) * row_words + bitmap_start_x;
+      for (int j = 0; j < width; j++) {
+        adjustor(data + offset + j);
+      }
+    }
+  }
+}
+
+// Returns the color value at the specified location.
+SkColor BitmapPlatformDeviceMac::GetColorAt(int x, int y) {
+  const SkBitmap& bitmap = accessBitmap(true);
+  SkAutoLockPixels lock(bitmap);
+  uint32_t* data = bitmap.getAddr32(0, 0);
+  return static_cast<SkColor>(data[x + y * width()]);
+}
+
+void BitmapPlatformDeviceMac::onAccessBitmap(SkBitmap*) {
+  // Not needed in CoreGraphics
+}
+
+}  // namespace gfx
diff --git a/base/gfx/bitmap_platform_device_mac.h b/base/gfx/bitmap_platform_device_mac.h
new file mode 100755
index 0000000..3a67239
--- /dev/null
+++ b/base/gfx/bitmap_platform_device_mac.h
@@ -0,0 +1,122 @@
+// Copyright 2008, 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 BASE_GFX_BITMAP_PLATFORM_DEVICE_MAC_H__
+#define BASE_GFX_BITMAP_PLATFORM_DEVICE_MAC_H__
+
+#include "base/gfx/platform_device_mac.h"
+#include "base/ref_counted.h"
+
+namespace gfx {
+
+// A device is basically a wrapper around SkBitmap that provides a surface for
+// SkCanvas to draw into. Our device provides a surface CoreGraphics can also
+// write to. BitmapPlatformDeviceMac creates a bitmap using
+// CGCreateBitmapContext() in a format that Skia supports and can then use this
+// to draw text into, etc. This pixel data is provided to the bitmap that the
+// device contains so that it can be shared.
+//
+// The device owns the pixel data, when the device goes away, the pixel data
+// also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses
+// reference counting for the pixel data. In normal Skia, you could assign
+// another bitmap to this device's bitmap and everything will work properly.
+// For us, that other bitmap will become invalid as soon as the device becomes
+// invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE
+// DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead.
+class BitmapPlatformDeviceMac : public PlatformDeviceMac {
+ public:
+  // Factory function. The screen DC is used to create the bitmap, and will not
+  // be stored beyond this function. is_opaque should be set if the caller
+  // knows the bitmap will be completely opaque and allows some optimizations.
+  //
+  // The shared_section parameter is optional (pass NULL for default behavior).
+  // If shared_section is non-null, then it must be a handle to a file-mapping
+  // object returned by CreateFileMapping.  See CreateDIBSection for details.
+  static BitmapPlatformDeviceMac* Create(CGContextRef context,
+                                         int width,
+                                         int height,
+                                         bool is_opaque);
+
+  // Copy constructor. When copied, devices duplicate their internal data, so
+  // stay linked. This is because their implementation is very heavyweight
+  // (lots of memory and CoreGraphics state). If a device has been copied, both
+  // clip rects and other state will stay in sync.
+  //
+  // This means it will NOT work to duplicate a device and assign it to a
+  // canvas, because the two canvases will each set their own clip rects, and
+  // the resulting CoreGraphics drawing state will be unpredictable.
+  //
+  // Copy constucting and "=" is designed for saving the device or passing it
+  // around to another routine willing to deal with the bitmap data directly.
+  BitmapPlatformDeviceMac(const BitmapPlatformDeviceMac& other);
+  virtual ~BitmapPlatformDeviceMac();
+
+  // See warning for copy constructor above.
+  BitmapPlatformDeviceMac& operator=(const BitmapPlatformDeviceMac& other);
+
+  virtual CGContextRef GetBitmapContext();
+  virtual void SetTransform(const SkMatrix& matrix);
+  virtual void SetDeviceOffset(int x, int y);
+
+  // This currently only supports extremely simple clip rects.
+  virtual void SetClipRegion(const SkRegion& region);
+
+  virtual void DrawToContext(CGContextRef context, int x, int y,
+                             const CGRect* src_rect);
+  virtual bool IsVectorial() { return false; }
+
+  // Returns the color value at the specified location. This does not
+  // consider any transforms that may be set on the device.
+  SkColor GetColorAt(int x, int y);
+
+ protected:
+  // Reference counted data that can be shared between multiple devices. This
+  // allows copy constructors and operator= for devices to work properly. The
+  // bitmaps used by the base device class are already refcounted and copyable.
+  class BitmapPlatformDeviceMacData;
+
+  BitmapPlatformDeviceMac(BitmapPlatformDeviceMacData* data,
+                          const SkBitmap& bitmap);
+
+  // Flushes the CoreGraphics context so that the pixel data can be accessed
+  // directly by Skia. Overridden from SkDevice, this is called when Skia
+  // starts accessing pixel data.
+  virtual void onAccessBitmap(SkBitmap*);
+
+  // Data associated with this device, guaranteed non-null.
+  scoped_refptr<BitmapPlatformDeviceMacData> data_;
+
+  virtual void processPixels(int x, int y,
+                             int width, int height, 
+                             adjustAlpha adjustor);
+};
+
+}  // namespace gfx
+
+#endif  // BASE_GFX_BITMAP_PLATFORM_DEVICE_MAC_H__
diff --git a/base/gfx/convolver.h b/base/gfx/convolver.h
index 8a2310e..2cb91af 100644
--- a/base/gfx/convolver.h
+++ b/base/gfx/convolver.h
@@ -34,6 +34,11 @@
 
 #include "base/basictypes.h"
 
+// avoid confusion with Mac OS X's math library (Carbon)
+#if defined(OS_MACOSX)
+#undef FloatToFixed
+#endif
+
 namespace gfx {
 
 // Represents a filter in one dimension. Each output pixel has one entry in this
diff --git a/base/gfx/image_operations.cc b/base/gfx/image_operations.cc
index 4dde08c..e53f6ce 100644
--- a/base/gfx/image_operations.cc
+++ b/base/gfx/image_operations.cc
@@ -204,7 +204,6 @@ void ResizeFilter::ComputeFilters(int src_size,
   // that the range covered by the filter won't necessarily cover any source
   // pixel boundaries. Therefore, we use these clamped values (max of 1) for
   // some computations.
-  float clamped_src_support = std::min(1.0f, src_support);
   float clamped_scale = std::min(1.0f, scale);
 
   // Speed up the divisions below by turning them into multiplies.
diff --git a/base/gfx/platform_canvas.h b/base/gfx/platform_canvas.h
new file mode 100644
index 0000000..269027d
--- /dev/null
+++ b/base/gfx/platform_canvas.h
@@ -0,0 +1,40 @@
+// Copyright 2008, 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.
+
+// Declare a platform-neutral name for this platform's canvas class
+// that can be used by upper-level classes that just need to pass a reference
+// around.
+
+#if defined(OS_WIN)
+class PlatformCanvasWin;
+typedef PlatformCanvasWin PlatformCanvas;
+#elif defined(OS_MACOSX)
+class PlatformCanvasMac;
+typedef PlatformCanvasMac PlatformCanvas;
+#endif
diff --git a/base/gfx/platform_canvas_mac.cc b/base/gfx/platform_canvas_mac.cc
new file mode 100755
index 0000000..0344a0a
--- /dev/null
+++ b/base/gfx/platform_canvas_mac.cc
@@ -0,0 +1,169 @@
+// Copyright 2008, 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.
+
+#include "base/gfx/platform_canvas_mac.h"
+
+#include "base/gfx/bitmap_platform_device_mac.h"
+#include "base/logging.h"
+
+namespace gfx {
+
+PlatformCanvasMac::PlatformCanvasMac() : SkCanvas() {
+}
+
+PlatformCanvasMac::PlatformCanvasMac(int width, int height, bool is_opaque)
+    : SkCanvas() {
+  initialize(width, height, is_opaque, NULL);
+}
+
+PlatformCanvasMac::PlatformCanvasMac(int width,
+                                     int height,
+                                     bool is_opaque,
+                                     CGContextRef context)
+    : SkCanvas() {
+  initialize(width, height, is_opaque, context);
+}
+
+PlatformCanvasMac::~PlatformCanvasMac() {
+}
+
+void PlatformCanvasMac::initialize(int width,
+                                   int height,
+                                   bool is_opaque,
+                                   CGContextRef context) {
+  SkDevice* device =
+      createPlatformDevice(width, height, is_opaque, context);
+  setDevice(device);
+  device->unref(); // was created with refcount 1, and setDevice also refs
+}
+
+CGContextRef PlatformCanvasMac::beginPlatformPaint() {
+  return getTopPlatformDevice().GetBitmapContext();
+}
+
+void PlatformCanvasMac::endPlatformPaint() {
+  // flushing will be done in onAccessBitmap
+}
+
+PlatformDeviceMac& PlatformCanvasMac::getTopPlatformDevice() const {
+  // All of our devices should be our special PlatformDeviceMac.
+  SkCanvas::LayerIter iter(const_cast<PlatformCanvasMac*>(this), false);
+  return *static_cast<PlatformDeviceMac*>(iter.device());
+}
+
+// Clipping -------------------------------------------------------------------
+
+bool PlatformCanvasMac::clipRect(const SkRect& rect, SkRegion::Op op) {
+  bool ret = SkCanvas::clipRect(rect, op);
+  getTopPlatformDevice().SetClipRegion(getTotalClip());
+  return ret;
+}
+
+bool PlatformCanvasMac::clipPath(const SkPath& path, SkRegion::Op op) {
+  bool ret = SkCanvas::clipPath(path, op);
+  getTopPlatformDevice().SetClipRegion(getTotalClip());
+  return ret;
+}
+
+bool PlatformCanvasMac::clipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
+  bool ret = SkCanvas::clipRegion(deviceRgn, op);
+  getTopPlatformDevice().SetClipRegion(getTotalClip());
+  return ret;
+}
+
+// Transforming ---------------------------------------------------------------
+
+bool PlatformCanvasMac::translate(SkScalar dx, SkScalar dy) {
+  if (!SkCanvas::translate(dx, dy))
+    return false;
+  getTopPlatformDevice().SetTransform(getTotalMatrix());
+  return true;
+}
+
+bool PlatformCanvasMac::scale(SkScalar sx, SkScalar sy) {
+  if (!SkCanvas::scale(sx, sy))
+    return false;
+  getTopPlatformDevice().SetTransform(getTotalMatrix());
+  return true;
+}
+
+int PlatformCanvasMac::saveLayer(const SkRect* bounds,
+                              const SkPaint* paint,
+                              SaveFlags flags) {
+  int result = SkCanvas::saveLayer(bounds, paint, flags);
+
+  // saveLayer will have created a new device which, depending on the clip
+  // rect, may be smaller than the original layer. Therefore, it will have a
+  // transform applied, and we need to sync CG with that transform.
+  SkCanvas::LayerIter iter(this, false);
+  PlatformDeviceMac& new_device =
+      *static_cast<PlatformDeviceMac*>(iter.device());
+
+  // There man not actually be a new layer if the layer is empty.
+  if (!iter.done()) {
+    new_device.SetDeviceOffset(iter.x(), iter.y());
+    new_device.SetTransform(getTotalMatrix());
+    new_device.SetClipRegion(getTotalClip());
+  }
+  return result;
+}
+
+int PlatformCanvasMac::save(SkCanvas::SaveFlags flags) {
+  int ret = SkCanvas::save(flags);
+  PlatformDeviceMac& device = getTopPlatformDevice();
+  device.SetTransform(getTotalMatrix());
+  device.SetClipRegion(getTotalClip());
+  return ret;
+}
+
+void PlatformCanvasMac::restore() {
+  SkCanvas::restore();
+  PlatformDeviceMac& device = getTopPlatformDevice();
+  device.SetTransform(getTotalMatrix());
+  device.SetClipRegion(getTotalClip());
+}
+
+SkDevice* PlatformCanvasMac::createDevice(SkBitmap::Config config,
+                                       int width,
+                                       int height,
+                                       bool is_opaque) {
+  DCHECK(config == SkBitmap::kARGB_8888_Config);
+  return createPlatformDevice(width, height, is_opaque, NULL);
+}
+
+SkDevice* PlatformCanvasMac::createPlatformDevice(int width,
+                                               int height,
+                                               bool is_opaque,
+                                               CGContextRef context) {
+  SkDevice* device = BitmapPlatformDeviceMac::Create(context, width, height,
+                                                  is_opaque);
+  return device;
+}
+
+}  // namespace gfx
diff --git a/base/gfx/platform_canvas_mac.h b/base/gfx/platform_canvas_mac.h
new file mode 100755
index 0000000..fd07797
--- /dev/null
+++ b/base/gfx/platform_canvas_mac.h
@@ -0,0 +1,129 @@
+// Copyright 2008, 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 BASE_GFX_PLATFORM_CANVAS_MAC_H__
+#define BASE_GFX_PLATFORM_CANVAS_MAC_H__
+
+#include "base/gfx/platform_device_mac.h"
+#include "base/basictypes.h"
+
+#import "SkCanvas.h"
+
+namespace gfx {
+
+// This class is a specialization of the regular SkCanvas that is designed to
+// work with a gfx::PlatformDevice to manage platform-specific drawing. It
+// allows using both Skia operations and platform-specific operations.
+class PlatformCanvasMac : public SkCanvas {
+ public:
+  // Set is_opaque if you are going to erase the bitmap and not use
+  // tranparency: this will enable some optimizations.  The shared_section
+  // parameter is passed to gfx::PlatformDevice::create.  See it for details.
+  //
+  // If you use the version with no arguments, you MUST call initialize()
+  PlatformCanvasMac();
+  PlatformCanvasMac(int width, int height, bool is_opaque);
+  PlatformCanvasMac(int width, int height, bool is_opaque, CGContextRef context);
+  virtual ~PlatformCanvasMac();
+
+  // For two-part init, call if you use the no-argument constructor above
+  void initialize(int width, int height, bool is_opaque, CGContextRef context);
+
+  // Keep the platform clipping in sync with the skia clipping. Note that
+  // platform clipping may only clip to the bounds of the clipping region, if
+  // it is complex.
+  virtual bool clipRect(const SkRect& rect,
+                        SkRegion::Op op = SkRegion::kIntersect_Op);
+  virtual bool clipPath(const SkPath& path,
+                        SkRegion::Op op = SkRegion::kIntersect_Op);
+  virtual bool clipRegion(const SkRegion& deviceRgn,
+                          SkRegion::Op op = SkRegion::kIntersect_Op);
+
+  // These calls should surround calls to platform drawing routines. The CG
+  // context returned by beginPlatformPaint is the one that can be used to
+  // draw into.
+  // Call endPlatformPaint when you are done and want to use Skia operations
+  // again; this will synchronize the bitmap.
+  virtual CGContextRef beginPlatformPaint();
+  virtual void endPlatformPaint();
+
+  // overridden to keep the platform graphics context in sync with the canvas
+  virtual bool translate(SkScalar dx, SkScalar dy);
+  virtual bool scale(SkScalar sx, SkScalar sy);
+  virtual int saveLayer(const SkRect* bounds, const SkPaint* paint,
+                        SaveFlags flags = kARGB_ClipLayer_SaveFlag);
+  virtual int save(SkCanvas::SaveFlags flags = SkCanvas::kMatrixClip_SaveFlag);
+  virtual void restore();
+
+  // Returns the platform device pointer of the topmost rect with a non-empty
+  // clip. In practice, this is usually either the top layer or nothing, since
+  // we usually set the clip to new layers when we make them.
+  //
+  // If there is no layer that is not all clipped out, this will return a
+  // dummy device so callers do not have to check. If you are concerned about
+  // performance, check the clip before doing any painting.
+  //  
+  // This is different than SkCanvas' getDevice, because that returns the
+  // bottommost device.
+  //
+  // Danger: the resulting device should not be saved. It will be invalidated
+  // by the next call to save() or restore().
+  PlatformDeviceMac& getTopPlatformDevice() const;
+
+  // Allow callers to see the non-virtual function even though we have an
+  // override of a virtual one.
+  using SkCanvas::clipRect;
+
+ protected:
+  // Creates a device store for use by the canvas. We override this so that
+  // the device is always our own so we know that we can use GDI operations
+  // on it. Simply calls into createPlatformDevice().
+  virtual SkDevice* createDevice(SkBitmap::Config, int width, int height,
+                                 bool is_opaque);
+
+  // Creates a device store for use by the canvas. By default, it creates a
+  // BitmapPlatformDevice object. Can be overridden to change the object type.
+  virtual SkDevice* createPlatformDevice(int width, int height, bool is_opaque,
+                                         CGContextRef context);
+
+ private:
+  // Unimplemented. This is to try to prevent people from calling this function
+  // on SkCanvas. SkCanvas' version is not virtual, so we can't prevent this
+  // 100%, but hopefully this will make people notice and not use the function.
+  // Calling SkCanvas' version will create a new device which is not compatible
+  // with us and we will crash if somebody tries to draw into it with
+  // CoreGraphics.
+  SkDevice* setBitmapDevice(const SkBitmap& bitmap);
+
+  DISALLOW_COPY_AND_ASSIGN(PlatformCanvasMac);
+};
+
+}  // namespace gfx
+
+#endif  // BASE_GFX_PLATFORM_CANVAS_MAC_H__
diff --git a/base/gfx/platform_device.h b/base/gfx/platform_device.h
new file mode 100644
index 0000000..22a079f
--- /dev/null
+++ b/base/gfx/platform_device.h
@@ -0,0 +1,40 @@
+// Copyright 2008, 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.
+
+// Declare a platform-neutral name for this platform's device class
+// that can be used by upper-level classes that just need to pass a reference
+// around.
+
+#if defined(OS_WIN)
+class PlatformDeviceWin;
+typedef PlatformDeviceWin PlatformDevice;
+#elif defined(OS_MACOSX)
+class PlatformDeviceMac;
+typedef PlatformDeviceMac PlatformDevice;
+#endif
diff --git a/base/gfx/platform_device_mac.cc b/base/gfx/platform_device_mac.cc
new file mode 100755
index 0000000..2e3d065
--- /dev/null
+++ b/base/gfx/platform_device_mac.cc
@@ -0,0 +1,130 @@
+// Copyright 2008, 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.
+
+#include "base/gfx/platform_device_mac.h"
+
+#include "base/logging.h"
+#include "base/gfx/skia_utils_mac.h"
+#include "SkMatrix.h"
+#include "SkPath.h"
+#include "SkUtils.h"
+
+namespace gfx {
+
+namespace {
+
+// Constrains position and size to fit within available_size.
+bool constrain(int available_size, int* position, int *size) {
+  if (*position < 0) {
+    *size += *position;
+    *position = 0;
+  }
+  if (*size > 0 && *position < available_size) {
+    int overflow = (*position + *size) - available_size;
+    if (overflow > 0) {
+      *size -= overflow;
+    }
+    return true;
+  }
+  return false;
+}
+
+// Sets the opacity of the specified value to 0xFF.
+void makeOpaqueAlphaAdjuster(uint32_t* pixel) {
+  *pixel |= 0xFF000000;
+}
+
+} // namespace
+
+PlatformDeviceMac::PlatformDeviceMac(const SkBitmap& bitmap)
+    : SkDevice(bitmap) {
+}
+
+void PlatformDeviceMac::makeOpaque(int x, int y, int width, int height) {
+  processPixels(x, y, width, height, makeOpaqueAlphaAdjuster);
+}
+
+// Set up the CGContextRef for peaceful coexistence with Skia
+void PlatformDeviceMac::InitializeCGContext(CGContextRef context) {
+  // CG defaults to the same settings as Skia
+}
+
+// static
+void PlatformDeviceMac::LoadPathToCGContext(CGContextRef context,
+                                            const SkPath& path) {
+  // instead of a persistent attribute of the context, CG specifies the fill
+  // type per call, so we just have to load up the geometry.
+  CGContextBeginPath(context);
+
+  SkPoint points[4] = {0};
+  SkPath::Iter iter(path, false);
+  for (SkPath::Verb verb = iter.next(points); verb != SkPath::kDone_Verb;
+       verb = iter.next(points)) {
+    switch (verb) {
+      case SkPath::kMove_Verb: {  // iter.next returns 1 point
+        CGContextMoveToPoint(context, points[0].fX, points[0].fY);
+        break;
+      }
+      case SkPath::kLine_Verb: {  // iter.next returns 2 points
+        CGContextAddLineToPoint(context, points[1].fX, points[1].fY);
+        break;
+      }
+      case SkPath::kQuad_Verb: {  // iter.next returns 3 points
+        CGContextAddQuadCurveToPoint(context, points[1].fX, points[1].fY,
+                                     points[2].fX, points[2].fY);
+        break;
+      }
+      case SkPath::kCubic_Verb: {  // iter.next returns 4 points
+        CGContextAddCurveToPoint(context, points[1].fX, points[1].fY,
+                                 points[2].fX, points[2].fY,
+                                 points[3].fX, points[3].fY);
+        break;
+      }
+      case SkPath::kClose_Verb: {  // iter.next returns 1 point (the last point)
+        break;
+      }
+      case SkPath::kDone_Verb:  // iter.next returns 0 points
+      default: {
+        NOTREACHED();
+        break;
+      }
+    }
+  }
+  CGContextClosePath(context);
+}
+
+// static
+void PlatformDeviceMac::LoadTransformToCGContext(CGContextRef context,
+                                                 const SkMatrix& matrix) {
+  // TOOD: CoreGraphics can concatenate transforms, but not reset the current
+  // ont.  Either find a workaround or remove this function if it turns out
+  // to be unneeded on the Mac.
+}
+
+}  // namespace gfx
diff --git a/base/gfx/platform_device_mac.h b/base/gfx/platform_device_mac.h
new file mode 100755
index 0000000..1da1c7a
--- /dev/null
+++ b/base/gfx/platform_device_mac.h
@@ -0,0 +1,117 @@
+// Copyright 2008, 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 BASE_GFX_PLATFORM_DEVICE_MAC_H__
+#define BASE_GFX_PLATFORM_DEVICE_MAC_H__
+
+#import <ApplicationServices/ApplicationServices.h>
+#include "SkDevice.h"
+
+class SkMatrix;
+class SkPath;
+class SkRegion;
+
+namespace gfx {
+
+// A device is basically a wrapper around SkBitmap that provides a surface for
+// SkCanvas to draw into. Our device provides a surface CoreGraphics can also
+// write to. It also provides functionality to play well with CG drawing
+// functions.
+// This class is abstract and must be subclassed. It provides the basic
+// interface to implement it either with or without a bitmap backend.
+class PlatformDeviceMac : public SkDevice {
+ public:
+  // The CGContext that corresponds to the bitmap, used for CoreGraphics
+  // operations drawing into the bitmap. This is possibly heavyweight, so it
+  // should exist only during one pass of rendering.
+  virtual CGContextRef GetBitmapContext() = 0;
+
+  // Translate the device's coordinate system by the given amount; this will
+  // override any previous calls to this function.
+  virtual void SetTransform(const SkMatrix& matrix) = 0;
+
+  // Devices may be in a layer and offset from the root device. In this case,
+  // the transform (set by setTransform) will corrspond to the root device, and
+  // this device will actually be offset from there.
+  //
+  // This is called after a layered device is created to tell us the location.
+  // This location will be factored into any transforms applied via
+  // setTransform.
+  //
+  // If this function is not called, the offset defaults to (0, 0);
+  virtual void SetDeviceOffset(int x, int y) = 0;
+
+  // Sets the clipping region, overriding any previous calls.
+  virtual void SetClipRegion(const SkRegion& region) = 0;
+
+  // Draws to the given graphics context. If the bitmap context doesn't exist,
+  // this will temporarily create it. However, if you have created the bitmap
+  // context, it will be more efficient if you don't free it until after this
+  // call so it doesn't have to be created twice.  If src_rect is null, then
+  // the entirety of the source device will be copied.
+  virtual void DrawToContext(CGContextRef context, int x, int y,
+                             const CGRect* src_rect) = 0;
+
+  // Sets the opacity of each pixel in the specified region to be opaque.
+  void makeOpaque(int x, int y, int width, int height);
+
+  // Returns if the preferred rendering engine is vectorial or bitmap based.
+  virtual bool IsVectorial() = 0;
+
+  // Initializes the default settings and colors in a device context.
+  static void InitializeCGContext(CGContextRef context);
+
+  // Loads a SkPath into the CG context. The path can there after be used for
+  // clipping or as a stroke.
+  static void LoadPathToCGContext(CGContextRef context, const SkPath& path);
+
+ protected:
+  // Forwards |bitmap| to SkDevice's constructor.
+  PlatformDeviceMac(const SkBitmap& bitmap);
+
+  // Loads the specified Skia transform into the device context
+  static void LoadTransformToCGContext(CGContextRef context,
+                                       const SkMatrix& matrix);
+
+  // Function pointer used by the processPixels method for setting the alpha
+  // value of a particular pixel.
+  typedef void (*adjustAlpha)(uint32_t* pixel);
+  
+  // Loops through each of the pixels in the specified range, invoking
+  // adjustor for the alpha value of each pixel.
+  virtual void processPixels(int x,
+                             int y,
+                             int width,
+                             int height,
+                             adjustAlpha adjustor) = 0;
+};
+
+}  // namespace gfx
+
+#endif  // BASE_GFX_PLATFORM_DEVICE_MAC_H__
diff --git a/base/gfx/size_mac.cc b/base/gfx/size_mac.cc
new file mode 100644
index 0000000..08bf997
--- /dev/null
+++ b/base/gfx/size_mac.cc
@@ -0,0 +1,48 @@
+// Copyright 2008, 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.
+
+#import <CoreGraphics/CoreGraphics.h>
+#include "base/gfx/size.h"
+
+#include <ostream>
+
+namespace gfx {
+
+CGSize Size::ToCGSize() const {
+  CGSize s;
+  s.width = width_;
+  s.height = height_;
+  return s;
+}
+
+std::ostream& operator<<(std::ostream& out, const gfx::Size& s) {
+  return out << s.width() << "x" << s.height();
+}
+
+}  // namespace gfx
diff --git a/base/gfx/skia_utils_mac.cc b/base/gfx/skia_utils_mac.cc
new file mode 100644
index 0000000..030a887
--- /dev/null
+++ b/base/gfx/skia_utils_mac.cc
@@ -0,0 +1,91 @@
+// Copyright 2008, 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.
+
+#include "base/gfx/skia_utils_mac.h"
+
+#include "base/logging.h"
+#include "SkRect.h"
+
+namespace gfx {
+
+SkIRect CGRectToSkIRect(const CGRect& rect) {
+  SkIRect sk_rect = {
+    SkScalarRound(rect.origin.x),
+    SkScalarRound(rect.origin.x),
+    SkScalarRound(rect.origin.x + rect.size.width),
+    SkScalarRound(rect.origin.y + rect.size.height)
+  };
+  return sk_rect;
+}
+
+SkRect CGRectToSkRect(const CGRect& rect) {
+  SkRect sk_rect = {
+    rect.origin.x,
+    rect.origin.x,
+    rect.origin.x + rect.size.width,
+    rect.origin.y + rect.size.height,
+  };
+  return sk_rect;
+}
+  
+CGRect SkIRectToCGRect(const SkIRect& rect) {
+  CGRect cg_rect = {
+    { rect.fLeft, rect.fTop },
+    { rect.fRight - rect.fLeft, rect.fBottom - rect.fTop }
+  };
+  return cg_rect;
+} 
+
+CGRect SkRectToCGRect(const SkRect& rect) {
+  CGRect cg_rect = {
+    { rect.fLeft, rect.fTop },
+    { rect.fRight - rect.fLeft, rect.fBottom - rect.fTop }
+  };
+  return cg_rect;
+}
+
+// Converts CGColorRef to the ARGB layout Skia expects.
+SkColor CGColorRefToSkColor(CGColorRef color) {
+  DCHECK(CGColorGetNumberOfComponents(color) == 4);
+  const CGFloat *components = CGColorGetComponents(color);
+  return SkColorSetARGB(SkScalarRound(255.0 * components[3]), // alpha
+                        SkScalarRound(255.0 * components[0]), // red
+                        SkScalarRound(255.0 * components[1]), // green
+                        SkScalarRound(255.0 * components[2])); // blue
+}
+
+// Converts ARGB to CGColorRef.
+CGColorRef SkColorToCGColorRef(SkColor color) {
+  return CGColorCreateGenericRGB(SkColorGetR(color) / 255.0,
+                                 SkColorGetG(color) / 255.0,
+                                 SkColorGetB(color) / 255.0,
+                                 SkColorGetA(color) / 255.0);
+}
+
+}  // namespace gfx
diff --git a/base/gfx/skia_utils_mac.h b/base/gfx/skia_utils_mac.h
new file mode 100644
index 0000000..aa17188
--- /dev/null
+++ b/base/gfx/skia_utils_mac.h
@@ -0,0 +1,71 @@
+// Copyright 2008, 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 BASE_GFX_SKIA_UTILS_MAC_H__
+#define BASE_GFX_SKIA_UTILS_MAC_H__
+
+#include "SkColor.h"
+#include <CoreGraphics/CGColor.h>
+
+struct SkIRect;
+struct SkPoint;
+struct SkRect;
+
+namespace gfx {
+
+// Converts a Skia point to a CoreGraphics CGPoint.
+// Both use same in-memory format.
+inline const CGPoint& SkPointToCGPoint(const SkPoint& point) {
+  return reinterpret_cast<const CGPoint&>(point);
+}
+
+// Converts a CoreGraphics point to a Skia CGPoint.
+// Both use same in-memory format.
+inline const SkPoint& CGPointToSkPoint(const CGPoint& point) {
+  return reinterpret_cast<const SkPoint&>(point);
+}
+  
+// Rectangle converters.
+SkRect CGRectToSkRect(const CGRect& rect);
+SkIRect CGRectToSkIRect(const CGRect& rect);
+
+// Converts a Skia rect to a CoreGraphics CGRect.
+CGRect SkIRectToCGRect(const SkIRect& rect);
+CGRect SkRectToCGRect(const SkRect& rect);
+
+// Converts CGColorRef to the ARGB layout Skia expects.
+SkColor CGColorRefToSkColor(CGColorRef color);
+
+// Converts ARGB to CGColorRef.
+CGColorRef SkColorToCGColorRef(SkColor color);
+
+}  // namespace gfx
+
+#endif