| // 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 <ImageIO/ImageIO.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #import <UIKit/UIKit.h> |
| |
| #include "base/ios/ios_util.h" |
| #include "base/logging.h" |
| #include "base/mac/scoped_cftyperef.h" |
| #include "base/macros.h" |
| #include "third_party/skia/include/utils/mac/SkCGUtils.h" |
| |
| namespace { |
| |
| const uint8_t kICOHeaderMagic[4] = {0x00, 0x00, 0x01, 0x00}; |
| |
| // Returns whether the data encodes an ico image. |
| bool EncodesIcoImage(NSData* image_data) { |
| if (image_data.length < arraysize(kICOHeaderMagic)) |
| return false; |
| return memcmp(kICOHeaderMagic, image_data.bytes, |
| arraysize(kICOHeaderMagic)) == 0; |
| } |
| |
| } // namespace |
| |
| namespace skia { |
| |
| SkBitmap CGImageToSkBitmap(CGImageRef image, CGSize size, bool is_opaque) { |
| SkBitmap bitmap; |
| if (!image) |
| return bitmap; |
| |
| if (!bitmap.tryAllocN32Pixels(size.width, size.height, is_opaque)) |
| return bitmap; |
| |
| 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::ScopedCFTypeRef<CGColorSpaceRef> color_space( |
| CGColorSpaceCreateDeviceRGB()); |
| base::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; |
| |
| CGRect imageRect = CGRectMake(0.0, 0.0, size.width, size.height); |
| CGContextSetBlendMode(context, kCGBlendModeCopy); |
| CGContextDrawImage(context, imageRect, image); |
| |
| return bitmap; |
| } |
| |
| UIImage* SkBitmapToUIImageWithColorSpace(const SkBitmap& skia_bitmap, |
| CGFloat scale, |
| CGColorSpaceRef color_space) { |
| if (skia_bitmap.isNull()) |
| return nil; |
| |
| // First convert SkBitmap to CGImageRef. |
| base::ScopedCFTypeRef<CGImageRef> cg_image( |
| SkCreateCGImageRefWithColorspace(skia_bitmap, color_space)); |
| |
| // Now convert to UIImage. |
| return [UIImage imageWithCGImage:cg_image.get() |
| scale:scale |
| orientation:UIImageOrientationUp]; |
| } |
| |
| std::vector<SkBitmap> ImageDataToSkBitmaps(NSData* image_data) { |
| DCHECK(image_data); |
| |
| // On iOS 8.1.1 |CGContextDrawImage| crashes when processing images included |
| // in .ico files that are 88x88 pixels or larger (http://crbug.com/435068). |
| bool skip_images_88x88_or_larger = |
| base::ios::IsRunningOnOrLater(8, 1, 1) && EncodesIcoImage(image_data); |
| |
| base::ScopedCFTypeRef<CFDictionaryRef> empty_dictionary( |
| CFDictionaryCreate(NULL, NULL, NULL, 0, NULL, NULL)); |
| std::vector<SkBitmap> frames; |
| |
| base::ScopedCFTypeRef<CGImageSourceRef> source( |
| CGImageSourceCreateWithData((CFDataRef)image_data, empty_dictionary)); |
| |
| size_t count = CGImageSourceGetCount(source); |
| for (size_t index = 0; index < count; ++index) { |
| base::ScopedCFTypeRef<CGImageRef> cg_image( |
| CGImageSourceCreateImageAtIndex(source, index, empty_dictionary)); |
| |
| CGSize size = CGSizeMake(CGImageGetWidth(cg_image), |
| CGImageGetHeight(cg_image)); |
| if (size.width >= 88 && size.height >= 88 && skip_images_88x88_or_larger) |
| continue; |
| |
| const SkBitmap bitmap = CGImageToSkBitmap(cg_image, size, false); |
| if (!bitmap.empty()) |
| frames.push_back(bitmap); |
| } |
| |
| DLOG_IF(WARNING, frames.size() != count) << "Only decoded " << frames.size() |
| << " frames for " << count << " expected."; |
| return frames; |
| } |
| |
| UIColor* UIColorFromSkColor(SkColor color) { |
| return [UIColor colorWithRed:SkColorGetR(color) / 255.0f |
| green:SkColorGetG(color) / 255.0f |
| blue:SkColorGetB(color) / 255.0f |
| alpha:SkColorGetA(color) / 255.0f]; |
| } |
| |
| } // namespace skia |