1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file
*/
#ifndef SkSpecialImage_DEFINED
#define SkSpecialImage_DEFINED
#include "SkNextID.h"
#include "SkRefCnt.h"
#include "SkSurfaceProps.h"
#include "SkImageFilter.h" // for OutputProperties
#include "SkImageInfo.h" // for SkAlphaType
class GrContext;
class GrSurfaceProxy;
class GrTexture;
class GrTextureProxy;
class SkBitmap;
class SkCanvas;
class SkImage;
struct SkImageInfo;
class SkPaint;
class SkPixmap;
class SkSpecialSurface;
class SkSurface;
enum {
kNeedNewImageUniqueID_SpecialImage = 0
};
/**
* This is a restricted form of SkImage solely intended for internal use. It
* differs from SkImage in that:
* - it can only be backed by raster or gpu (no generators)
* - it can be backed by a GrTextureProxy larger than its nominal bounds
* - it can't be drawn tiled
* - it can't be drawn with MIPMAPs
* It is similar to SkImage in that it abstracts how the pixels are stored/represented.
*
* Note: the contents of the backing storage outside of the subset rect are undefined.
*/
class SkSpecialImage : public SkRefCnt {
public:
typedef void* ReleaseContext;
typedef void(*RasterReleaseProc)(void* pixels, ReleaseContext);
const SkSurfaceProps& props() const { return fProps; }
int width() const { return fSubset.width(); }
int height() const { return fSubset.height(); }
const SkIRect& subset() const { return fSubset; }
SkColorSpace* getColorSpace() const;
uint32_t uniqueID() const { return fUniqueID; }
virtual SkAlphaType alphaType() const = 0;
virtual size_t getSize() const = 0;
/**
* Ensures that a special image is backed by a texture (when GrContext is non-null). If no
* transformation is required, the returned image may be the same as this special image.
* If this special image is from a different GrContext, this will fail.
*/
sk_sp<SkSpecialImage> makeTextureImage(GrContext*);
/**
* Draw this SpecialImage into the canvas.
*/
void draw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const;
static sk_sp<SkSpecialImage> MakeFromImage(const SkIRect& subset,
sk_sp<SkImage>,
SkColorSpace* dstColorSpace,
const SkSurfaceProps* = nullptr);
static sk_sp<SkSpecialImage> MakeFromRaster(const SkIRect& subset,
const SkBitmap&,
const SkSurfaceProps* = nullptr);
#if SK_SUPPORT_GPU
static sk_sp<SkSpecialImage> MakeDeferredFromGpu(GrContext*,
const SkIRect& subset,
uint32_t uniqueID,
sk_sp<GrTextureProxy>,
sk_sp<SkColorSpace>,
const SkSurfaceProps* = nullptr,
SkAlphaType at = kPremul_SkAlphaType);
#endif
/**
* Create a new special surface with a backend that is compatible with this special image.
*/
sk_sp<SkSpecialSurface> makeSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size,
SkAlphaType at = kPremul_SkAlphaType) const;
/**
* Create a new surface with a backend that is compatible with this special image.
* TODO: switch this to makeSurface once we resolved the naming issue
*/
sk_sp<SkSurface> makeTightSurface(const SkImageFilter::OutputProperties& outProps,
const SkISize& size,
SkAlphaType at = kPremul_SkAlphaType) const;
/**
* Extract a subset of this special image and return it as a special image.
* It may or may not point to the same backing memory.
*/
sk_sp<SkSpecialImage> makeSubset(const SkIRect& subset) const;
/**
* Create an SkImage from the contents of this special image optionally extracting a subset.
* It may or may not point to the same backing memory.
* Note: when no 'subset' parameter is specified the the entire SkSpecialImage will be
* returned - including whatever extra padding may have resulted from a loose fit!
* When the 'subset' parameter is specified the returned image will be tight even if that
* entails a copy!
*/
sk_sp<SkImage> asImage(const SkIRect* subset = nullptr) const;
// TODO: hide this when GrLayerHoister uses SkSpecialImages more fully (see skbug.com/5063)
/**
* If the SpecialImage is backed by a gpu texture, return true.
*/
bool isTextureBacked() const;
/**
* Return the GrContext if the SkSpecialImage is GrTexture-backed
*/
GrContext* getContext() const;
#if SK_SUPPORT_GPU
/**
* Regardless of the underlying backing store, return the contents as a GrTextureProxy.
* The active portion of the texture can be retrieved via 'subset'.
*/
sk_sp<GrTextureProxy> asTextureProxyRef(GrContext*) const;
#endif
// TODO: hide this whe the imagefilter all have a consistent draw path (see skbug.com/5063)
/**
* Regardless of the underlying backing store, return the contents as an SkBitmap
*
* The returned ImageInfo represents the backing memory. Use 'subset'
* to get the active portion's dimensions.
*/
bool getROPixels(SkBitmap*) const;
protected:
SkSpecialImage(const SkIRect& subset, uint32_t uniqueID, const SkSurfaceProps*);
private:
const SkSurfaceProps fProps;
const SkIRect fSubset;
const uint32_t fUniqueID;
typedef SkRefCnt INHERITED;
};
#endif
|
