Introduce PlatformBitmap, which is a minimal helper class that wraps an SkBitmap

skia/ext/bitmap_platform_device_mac.cc

Index: skia/ext/bitmap_platform_device_mac.cc
===================================================================
--- skia/ext/bitmap_platform_device_mac.cc	(revision 160846)
+++ skia/ext/bitmap_platform_device_mac.cc	(working copy)
@@ -16,6 +16,8 @@
 #include "third_party/skia/include/core/SkTypes.h"
 #include "third_party/skia/include/core/SkUtils.h"
 
+#include "skia/ext/platform_canvas.h"

[brettw, 2012/10/09 20:40:12]

This should go in the above block in order.

[reed1, 2012/10/09 21:06:43]

Done.

+
 namespace skia {
 
 namespace {
@@ -254,4 +256,36 @@
   return bitmap_device;
 }
 
+// Port of PlatformBitmap to mac
+
+PlatformBitmap::~PlatformBitmap() {
+  if (surface_)
+    CGContextRelease(surface_);
+}
+
+bool PlatformBitmap::Allocate(int width, int height, bool isOpaque) {
+  if (RasterDeviceTooBigToAllocate(width, height))
+    return false;
+    
+  bitmap_.setConfig(SkBitmap::kARGB_8888_Config, width, height, width * 4);
+  if (!bitmap_.allocPixels())
+      return false;
+
+  if (!isOpaque)
+    bitmap_.eraseColor(0);
+  bitmap_.setIsOpaque(isOpaque);
+  return true;
+}
+
+PlatformSurface PlatformBitmap::LockSurface() {
+  if (!surface_ && bitmap_.getPixels())
+    surface_ = CGContextForData(bitmap_.getPixels(), bitmap_.width(),
+                                bitmap_.height());
+  return surface_;
+}
+
+void PlatformBitmap::UnlockSurface() {
+  // nothing to do for our CGContext. It will be released in our destructor
+}
+
 }  // namespace skia