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// Copyright 2012 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/skia_utils_ios.h"
#import <UIKit/UIKit.h>
#include "base/logging.h"
#include "base/mac/scoped_cftyperef.h"
#include "third_party/skia/include/utils/mac/SkCGUtils.h"
namespace gfx {
SkBitmap UIImageToSkBitmap(UIImage* image, CGSize size, bool is_opaque) {
SkBitmap bitmap;
if (!image)
return bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, size.width, size.height);
if (!bitmap.allocPixels())
return bitmap;
bitmap.setIsOpaque(is_opaque);
void* data = bitmap.getPixels();
// Allocate a bitmap context with 4 components per pixel (BGRA). Apple
// recommends these flags for improved CG performance.
#define HAS_ARGB_SHIFTS(a, r, g, b) \
(SK_A32_SHIFT == (a) && SK_R32_SHIFT == (r) \
&& SK_G32_SHIFT == (g) && SK_B32_SHIFT == (b))
#if defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0)
base::mac::ScopedCFTypeRef<CGColorSpaceRef> color_space(
CGColorSpaceCreateDeviceRGB());
base::mac::ScopedCFTypeRef<CGContextRef> context(
CGBitmapContextCreate(data, size.width, size.height, 8, size.width*4,
color_space,
kCGImageAlphaPremultipliedFirst |
kCGBitmapByteOrder32Host));
#else
#error We require that Skia's and CoreGraphics's recommended \
image memory layout match.
#endif
#undef HAS_ARGB_SHIFTS
DCHECK(context);
if (!context)
return bitmap;
// UIGraphicsPushContext be called from the main thread.
// TODO(rohitrao): We can use CG to make this thread safe, but the mac code
// calls setCurrentContext, so it's similarly limited to the main thread.
DCHECK([NSThread isMainThread]);
UIGraphicsPushContext(context);
[image drawInRect:CGRectMake(0, 0, size.width, size.height)
blendMode:kCGBlendModeCopy
alpha:1.0];
UIGraphicsPopContext();
return bitmap;
}
UIImage* SkBitmapToUIImageWithColorSpace(const SkBitmap& skia_bitmap,
CGColorSpaceRef color_space) {
if (skia_bitmap.isNull())
return nil;
// First convert SkBitmap to CGImageRef.
base::mac::ScopedCFTypeRef<CGImageRef> cg_image(
SkCreateCGImageRefWithColorspace(skia_bitmap, color_space));
// Now convert to UIImage.
// TODO(rohitrao): Gotta incorporate the scale factor somewhere!
return [UIImage imageWithCGImage:cg_image.get()];
}
} // namespace gfx
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