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39
40#include "qimage.h"
41
42#include <private/qcore_mac_p.h>
43#include <private/qcoregraphics_p.h>
44
45#import <Foundation/Foundation.h>
46#import <CoreGraphics/CoreGraphics.h>
47
48QT_BEGIN_NAMESPACE
49
50/*!
51 Creates a \c CGImage equivalent to this QImage. Returns a
52 \c CGImageRef handle.
53
54 The returned CGImageRef partakes in the QImage implicit sharing,
55 and holds a reference to the QImage data. CGImage is immutable
56 and will never detach the QImage. Writing to the QImage will detach
57 as usual.
58
59 This function is fast, and does not copy or convert image data.
60
61 The following image formats are supported, and will be mapped to
62 a corresponding native image type:
63
64 \table
65 \header
66 \li Qt
67 \li CoreGraphics
68 \row
69 \li Format_ARGB32
70 \li kCGImageAlphaFirst | kCGBitmapByteOrder32Host
71 \row
72 \li Format_RGB32
73 \li kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Host
74 \row
75 \li Format_RGBA8888_Premultiplied
76 \li kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big
77 \row
78 \li Format_RGBA8888
79 \li kCGImageAlphaLast | kCGBitmapByteOrder32Big
80 \row
81 \li Format_RGBX8888
82 \li kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Big
83 \row
84 \li Format_ARGB32_Premultiplied
85 \li kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host
86 \endtable
87
88 Other formats are not supported; this function returns a null
89 CGImageRef for those cases. Users of this function may then
90 convert the QImage to a supported formate first, for example
91 Format_ARGB32_Premultiplied.
92
93 The CGImageRef color space is set to the sRGB color space.
94
95 \sa QtMac::toNSImage()
96*/
97CGImageRef QImage::toCGImage() const
98{
99 if (isNull())
100 return nil;
101
102 CGBitmapInfo bitmapInfo = qt_mac_bitmapInfoForImage(*this);
103
104 // Format not supported: return nil CGImageRef
105 if (bitmapInfo == kCGImageAlphaNone)
106 return nil;
107
108 // Create a data provider that owns a copy of the QImage and references the image data.
109 auto deleter = [](void *image, const void *, size_t)
110 { delete static_cast<QImage *>(image); };
111 QCFType<CGDataProviderRef> dataProvider =
112 CGDataProviderCreateWithData(new QImage(*this), bits(), sizeInBytes(), deleter);
113
114 QCFType<CGColorSpaceRef> colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
115
116 const size_t bitsPerComponent = 8;
117 const size_t bitsPerPixel = 32;
118 const CGFloat *decode = nullptr;
119 const bool shouldInterpolate = false;
120
121 return CGImageCreate(width(), height(), bitsPerComponent, bitsPerPixel,
122 this->bytesPerLine(), colorSpace, bitmapInfo, dataProvider,
123 decode, shouldInterpolate, kCGRenderingIntentDefault);
124}
125
126QT_END_NAMESPACE
127

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