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Diffstat (limited to 'chrome/browser/cocoa/cocoa_utils.mm')
-rw-r--r-- | chrome/browser/cocoa/cocoa_utils.mm | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/chrome/browser/cocoa/cocoa_utils.mm b/chrome/browser/cocoa/cocoa_utils.mm new file mode 100644 index 0000000..e9bd9be --- /dev/null +++ b/chrome/browser/cocoa/cocoa_utils.mm @@ -0,0 +1,99 @@ +// 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 + |