Bitmap transport

skia/ext/platform_canvas_mac.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "skia/ext/platform_canvas_mac.h"
 
 #include "skia/ext/bitmap_platform_device_mac.h"
 #include "SkTypes.h"
 
 namespace skia {
 
 PlatformCanvasMac::PlatformCanvasMac() : SkCanvas() {
 }
 
 PlatformCanvasMac::PlatformCanvasMac(int width, int height, bool is_opaque)
     : SkCanvas() {
   initialize(width, height, is_opaque);
 }
 
 PlatformCanvasMac::PlatformCanvasMac(int width,
                                      int height,
                                      bool is_opaque,
                                      CGContextRef context)
     : SkCanvas() {
   initialize(width, height, is_opaque);
 }
 
+PlatformCanvasMac::PlatformCanvasMac(int width,
+                                     int height,
+                                     bool is_opaque,
+                                     uint8_t* data)
+    : SkCanvas() {
+  initialize(width, height, is_opaque, data);
+}
+
 PlatformCanvasMac::~PlatformCanvasMac() {
 }
 
 bool PlatformCanvasMac::initialize(int width,
                                    int height,
                                    bool is_opaque) {
   SkDevice* device = createPlatformDevice(width, height, is_opaque, NULL);
   if (!device)
     return false;
 
   setDevice(device);
   device->unref();  // was created with refcount 1, and setDevice also refs
   return true;
 }
 
+bool PlatformCanvasMac::initialize(int width,
+                                   int height,
+                                   bool is_opaque,
+                                   uint8_t* data) {
+  CGContextRef context = NULL;
+  CGColorSpaceRef colorSpace;
+
+  colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+  context = CGBitmapContextCreate(
+      data, width, height, 8 /* bits per plane */, 4 * width /* stride */,
+      colorSpace, kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
+  CGColorSpaceRelease(colorSpace);
+  if (!context)
+    return false;
+  // Change the coordinate system to match WebCore's
+  CGContextTranslateCTM(context, 0, height);
+  CGContextScaleCTM(context, 1.0, -1.0);
+
+  SkDevice* device = createPlatformDevice(width, height, is_opaque, context);
+  if (!device)
+    return false;
+
+  setDevice(device);
+  device->unref();  // was created with refcount 1, and setDevice also refs
+  return true;
+}
+
 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.
@@ skipping 22 matching lines @@
   SkASSERT(false);
   return NULL;
 }
 
 // static
 size_t PlatformCanvasMac::StrideForWidth(unsigned width) {
   return 4 * width;
 }
 
 }  // namespace skia