1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "include/codec/SkEncodedOrigin.h"
9 #include "include/ports/SkImageGeneratorCG.h"
10 #include "include/private/SkTemplates.h"
11 #include "include/utils/mac/SkCGUtils.h"
12 #include "src/core/SkPixmapPriv.h"
13 #include "src/utils/mac/SkUniqueCFRef.h"
14
15 #ifdef SK_BUILD_FOR_MAC
16 #include <ApplicationServices/ApplicationServices.h>
17 #endif
18
19 #ifdef SK_BUILD_FOR_IOS
20 #include <CoreGraphics/CoreGraphics.h>
21 #include <ImageIO/ImageIO.h>
22 #include <MobileCoreServices/MobileCoreServices.h>
23 #endif
24
25 namespace {
26 class ImageGeneratorCG : public SkImageGenerator {
27 public:
28 ImageGeneratorCG(const SkImageInfo&, SkUniqueCFRef<CGImageSourceRef> imageSrc,
29 sk_sp<SkData> data, SkEncodedOrigin);
30
31 protected:
32 sk_sp<SkData> onRefEncodedData() override;
33
34 bool onGetPixels(const SkImageInfo&, void* pixels, size_t rowBytes, const Options&) override;
35
36 private:
37 const SkUniqueCFRef<CGImageSourceRef> fImageSrc;
38 const sk_sp<SkData> fData;
39 const SkEncodedOrigin fOrigin;
40
41 typedef SkImageGenerator INHERITED;
42 };
43
data_to_CGImageSrc(SkData * data)44 static SkUniqueCFRef<CGImageSourceRef> data_to_CGImageSrc(SkData* data) {
45 SkUniqueCFRef<CGDataProviderRef> cgData(
46 CGDataProviderCreateWithData(data, data->data(), data->size(), nullptr));
47 if (!cgData) {
48 return nullptr;
49 }
50 return SkUniqueCFRef<CGImageSourceRef>(
51 CGImageSourceCreateWithDataProvider(cgData.get(), nullptr));
52 }
53
54 } // namespace
55
MakeFromEncodedCG(sk_sp<SkData> data)56 std::unique_ptr<SkImageGenerator> SkImageGeneratorCG::MakeFromEncodedCG(sk_sp<SkData> data) {
57 SkUniqueCFRef<CGImageSourceRef> imageSrc = data_to_CGImageSrc(data.get());
58 if (!imageSrc) {
59 return nullptr;
60 }
61
62 SkUniqueCFRef<CFDictionaryRef> properties(
63 CGImageSourceCopyPropertiesAtIndex(imageSrc.get(), 0, nullptr));
64 if (!properties) {
65 return nullptr;
66 }
67
68 CFNumberRef widthRef = static_cast<CFNumberRef>(
69 CFDictionaryGetValue(properties.get(), kCGImagePropertyPixelWidth));
70 CFNumberRef heightRef = static_cast<CFNumberRef>(
71 CFDictionaryGetValue(properties.get(), kCGImagePropertyPixelHeight));
72 if (nullptr == widthRef || nullptr == heightRef) {
73 return nullptr;
74 }
75
76 int width, height;
77 if (!CFNumberGetValue(widthRef , kCFNumberIntType, &width ) ||
78 !CFNumberGetValue(heightRef, kCFNumberIntType, &height))
79 {
80 return nullptr;
81 }
82
83 bool hasAlpha = bool(CFDictionaryGetValue(properties.get(), kCGImagePropertyHasAlpha));
84 SkAlphaType alphaType = hasAlpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType;
85 SkImageInfo info = SkImageInfo::MakeS32(width, height, alphaType);
86
87 SkEncodedOrigin origin = kDefault_SkEncodedOrigin;
88 CFNumberRef orientationRef = static_cast<CFNumberRef>(
89 CFDictionaryGetValue(properties.get(), kCGImagePropertyOrientation));
90 int originInt;
91 if (orientationRef && CFNumberGetValue(orientationRef, kCFNumberIntType, &originInt)) {
92 origin = (SkEncodedOrigin) originInt;
93 }
94
95 if (SkPixmapPriv::ShouldSwapWidthHeight(origin)) {
96 info = SkPixmapPriv::SwapWidthHeight(info);
97 }
98
99 // FIXME: We have the opportunity to extract color space information here,
100 // though I think it makes sense to wait until we understand how
101 // we want to communicate it to the generator.
102
103 return std::unique_ptr<SkImageGenerator>(new ImageGeneratorCG(info, std::move(imageSrc),
104 std::move(data), origin));
105 }
106
ImageGeneratorCG(const SkImageInfo & info,SkUniqueCFRef<CGImageSourceRef> src,sk_sp<SkData> data,SkEncodedOrigin origin)107 ImageGeneratorCG::ImageGeneratorCG(const SkImageInfo& info, SkUniqueCFRef<CGImageSourceRef> src,
108 sk_sp<SkData> data, SkEncodedOrigin origin)
109 : INHERITED(info)
110 , fImageSrc(std::move(src))
111 , fData(std::move(data))
112 , fOrigin(origin)
113 {}
114
onRefEncodedData()115 sk_sp<SkData> ImageGeneratorCG::onRefEncodedData() {
116 return fData;
117 }
118
onGetPixels(const SkImageInfo & info,void * pixels,size_t rowBytes,const Options &)119 bool ImageGeneratorCG::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
120 const Options&)
121 {
122 if (kN32_SkColorType != info.colorType()) {
123 // FIXME: Support other colorTypes.
124 return false;
125 }
126
127 switch (info.alphaType()) {
128 case kOpaque_SkAlphaType:
129 if (kOpaque_SkAlphaType != this->getInfo().alphaType()) {
130 return false;
131 }
132 break;
133 case kPremul_SkAlphaType:
134 break;
135 default:
136 return false;
137 }
138
139 SkUniqueCFRef<CGImageRef> image(CGImageSourceCreateImageAtIndex(fImageSrc.get(), 0, nullptr));
140 if (!image) {
141 return false;
142 }
143
144 SkPixmap dst(info, pixels, rowBytes);
145 auto decode = [&image](const SkPixmap& pm) {
146 // FIXME: Using SkCopyPixelsFromCGImage (as opposed to swizzling
147 // ourselves) greatly restricts the color and alpha types that we
148 // support. If we swizzle ourselves, we can add support for:
149 // kUnpremul_SkAlphaType
150 // 16-bit per component RGBA
151 // kGray_8_SkColorType
152 // Additionally, it would be interesting to compare the performance
153 // of SkSwizzler with CG's built in swizzler.
154 return SkCopyPixelsFromCGImage(pm, image.get());
155 };
156 return SkPixmapPriv::Orient(dst, fOrigin, decode);
157 }
158