1 /*
2  * Copyright 2008 The Android Open Source Project
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 "SkImageEncoderPriv.h"
9 
10 #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
11 
12 #include "mac/SkUniqueCFRef.h"
13 #include "SkBitmap.h"
14 #include "SkCGUtils.h"
15 #include "SkColorData.h"
16 #include "SkData.h"
17 #include "SkStream.h"
18 #include "SkStreamPriv.h"
19 #include "SkTemplates.h"
20 #include "SkUnPreMultiply.h"
21 
22 #ifdef SK_BUILD_FOR_MAC
23 #include <ApplicationServices/ApplicationServices.h>
24 #endif
25 
26 #ifdef SK_BUILD_FOR_IOS
27 #include <CoreGraphics/CoreGraphics.h>
28 #include <ImageIO/ImageIO.h>
29 #include <MobileCoreServices/MobileCoreServices.h>
30 #endif
31 
32 static size_t consumer_put(void* info, const void* buffer, size_t count) {
33     SkWStream* stream = reinterpret_cast<SkWStream*>(info);
34     return stream->write(buffer, count) ? count : 0;
35 }
36 
37 static void consumer_release(void* info) {
38     // we do nothing, since by design we don't "own" the stream (i.e. info)
39 }
40 
41 static SkUniqueCFRef<CGDataConsumerRef> SkStreamToCGDataConsumer(SkWStream* stream) {
42     CGDataConsumerCallbacks procs;
43     procs.putBytes = consumer_put;
44     procs.releaseConsumer = consumer_release;
45     // we don't own/reference the stream, so it our consumer must not live
46     // longer that our caller's ownership of the stream
47     return SkUniqueCFRef<CGDataConsumerRef>(CGDataConsumerCreate(stream, &procs));
48 }
49 
50 static SkUniqueCFRef<CGImageDestinationRef> SkStreamToImageDestination(SkWStream* stream,
51                                                                        CFStringRef type) {
52     SkUniqueCFRef<CGDataConsumerRef> consumer = SkStreamToCGDataConsumer(stream);
53     if (nullptr == consumer) {
54         return nullptr;
55     }
56 
57     return SkUniqueCFRef<CGImageDestinationRef>(
58             CGImageDestinationCreateWithDataConsumer(consumer.get(), type, 1, nullptr));
59 }
60 
61 /*  Encode bitmaps via CGImageDestination. We setup a DataConsumer which writes
62     to our SkWStream. Since we don't reference/own the SkWStream, our consumer
63     must only live for the duration of the onEncode() method.
64  */
65 bool SkEncodeImageWithCG(SkWStream* stream, const SkPixmap& pixmap, SkEncodedImageFormat format) {
66     SkBitmap bm;
67     if (!bm.installPixels(pixmap)) {
68         return false;
69     }
70     bm.setImmutable();
71 
72     CFStringRef type;
73     switch (format) {
74         case SkEncodedImageFormat::kICO:
75             type = kUTTypeICO;
76             break;
77         case SkEncodedImageFormat::kBMP:
78             type = kUTTypeBMP;
79             break;
80         case SkEncodedImageFormat::kGIF:
81             type = kUTTypeGIF;
82             break;
83         case SkEncodedImageFormat::kJPEG:
84             type = kUTTypeJPEG;
85             break;
86         case SkEncodedImageFormat::kPNG:
87             // PNG encoding an ARGB_4444 bitmap gives the following errors in GM:
88             // <Error>: CGImageDestinationAddImage image could not be converted to destination
89             // format.
90             // <Error>: CGImageDestinationFinalize image destination does not have enough images
91             // So instead we copy to 8888.
92             if (bm.colorType() == kARGB_4444_SkColorType) {
93                 SkBitmap bitmapN32;
94                 bitmapN32.allocPixels(bm.info().makeColorType(kN32_SkColorType));
95                 bm.readPixels(bitmapN32.info(), bitmapN32.getPixels(), bitmapN32.rowBytes(), 0, 0);
96                 bm.swap(bitmapN32);
97             }
98             type = kUTTypePNG;
99             break;
100         default:
101             return false;
102     }
103 
104     SkUniqueCFRef<CGImageDestinationRef> dst = SkStreamToImageDestination(stream, type);
105     if (nullptr == dst) {
106         return false;
107     }
108 
109     SkUniqueCFRef<CGImageRef> image(SkCreateCGImageRef(bm));
110     if (nullptr == image) {
111         return false;
112     }
113 
114     CGImageDestinationAddImage(dst.get(), image.get(), nullptr);
115     return CGImageDestinationFinalize(dst.get());
116 }
117 
118 #endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
119