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chrome/browser/cocoa/cocoa_utils.mm

+// Copyright (c) 2009 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 <base/logging.h>
+#include "chrome/browser/cocoa/cocoa_utils.h"
+#import <QuartzCore/CIImage.h>
+#include "third_party/skia/include/utils/mac/SkCGUtils.h"
+#include "third_party/skia/include/core/SkColorPriv.h"
+
+namespace {
+
+// Callback passed to CGDataProviderCreateWithData()
+void ReleaseData(void* info, const void* pixelData, size_t size) {
+  // info is a non-const pixelData
+  if (info)
+    free(info);
+}
+
+}
+
+namespace CocoaUtils {
+
+NSImage* SkBitmapToNSImage(const SkBitmap& icon) {
+  // First convert SkBitmap to CGImageRef.
+  CGImageRef cgimage;
+  if (icon.config() != SkBitmap::kARGB_8888_Config) {
+    cgimage = SkCreateCGImageRef(icon);
+  } else {
+    // The above code returns a valid NSImage even in the
+    // kARGB_8888_Config case.  As an example, the unit test which
+    // draws a blue SkBitmap can lockPixels, NSReadPixel, and pull out
+    // a single pixel from the NSImage and see it blue.  However, the
+    // NSImage returned will be in ABGR format.  Although Cocoa is
+    // otherwise happy with that format (as seen in simple tests
+    // outside Chromium), Chromium is NOT happy.  In Chromium, B and R
+    // are swapped.
+    //
+    // As a hint, CIImage supports a few formats, such as ARGB.
+    // Interestingly, it does NOT support ABGR.  I speculate there is
+    // some way we set up our drawing context which has the format
+    // specified wrong (in skia/ext/bitmap_platform_device_mac.cc),
+    // but I have not been able to solve this yet.
+    //
+    // TODO(jrg): track down the disconnect.
+    // TODO(jrg): Remove byte conversion.
+    // TODO(jrg): Fix unit tests to NOT swap bytes.
+    // http://crbug.com/14020
+    CGBitmapInfo info = (kCGImageAlphaPremultipliedFirst |
+                         kCGBitmapByteOrder32Host);
+    int width = icon.width();
+    int height = icon.height();
+    int rowbytes = icon.rowBytes();
+    int rowwords = rowbytes/4;
+    unsigned length = rowbytes * height;
+    DCHECK(length > 0);
+    uint32_t* rawptr = static_cast<uint32_t*>(malloc(length));
+    DCHECK(rawptr);
+    if (!rawptr || !length)
+      return nil;
+
+    // Convert ABGR to ARGB
+    icon.lockPixels();
+    uint32_t* rawbitmap = static_cast<uint32_t*>(icon.getPixels());
+    uint32_t rawbit;
+    int offset;
+    for (int y = 0; y < height; y++) {
+      for (int x = 0; x < width; x++) {
+        offset = x + y*rowwords;
+        rawbit = rawbitmap[offset];
+        rawptr[offset] = SkPackARGB32(SkGetPackedA32(rawbit),
+                                      SkGetPackedR32(rawbit),
+                                      SkGetPackedG32(rawbit),
+                                      SkGetPackedB32(rawbit));
+      }
+    }
+    icon.unlockPixels();
+
+    CGDataProviderRef dataRef =
+      CGDataProviderCreateWithData(rawptr, rawptr, length, ReleaseData);
+    CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+    cgimage = CGImageCreate(width, height, 8,
+                            icon.bytesPerPixel() * 8,
+                            rowbytes, space, info, dataRef,
+                            NULL, false, kCGRenderingIntentDefault);
+    CGColorSpaceRelease(space);
+    CGDataProviderRelease(dataRef);
+  }
+
+  // Now convert to NSImage.
+  NSBitmapImageRep* bitmap = [[[NSBitmapImageRep alloc]
+                                   initWithCGImage:cgimage] autorelease];
+  NSImage* image = [[[NSImage alloc] init] autorelease];
+  [image addRepresentation:bitmap];
+  return image;
+}
+
+}  // namespace CocoaUtils
+