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
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkImagePriv.h"
#include "SkImage_Base.h"
static SkImage_Base* as_IB(SkImage* image) {
return static_cast<SkImage_Base*>(image);
}
static const SkImage_Base* as_IB(const SkImage* image) {
return static_cast<const SkImage_Base*>(image);
}
uint32_t SkImage::NextUniqueID() {
static int32_t gUniqueID;
// never return 0;
uint32_t id;
do {
id = sk_atomic_inc(&gUniqueID) + 1;
} while (0 == id);
return id;
}
void SkImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y,
const SkPaint* paint) {
as_IB(this)->onDraw(canvas, x, y, paint);
}
void SkImage::draw(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
const SkPaint* paint) {
as_IB(this)->onDrawRectToRect(canvas, src, dst, paint);
}
const void* SkImage::peekPixels(SkImageInfo* info, size_t* rowBytes) const {
SkImageInfo infoStorage;
size_t rowBytesStorage;
if (NULL == info) {
info = &infoStorage;
}
if (NULL == rowBytes) {
rowBytes = &rowBytesStorage;
}
return as_IB(this)->onPeekPixels(info, rowBytes);
}
bool SkImage::readPixels(SkBitmap* bitmap, const SkIRect* subset) const {
if (NULL == bitmap) {
return false;
}
SkIRect bounds = SkIRect::MakeWH(this->width(), this->height());
// trim against the bitmap, if its already been allocated
if (bitmap->pixelRef()) {
bounds.fRight = SkMin32(bounds.fRight, bitmap->width());
bounds.fBottom = SkMin32(bounds.fBottom, bitmap->height());
if (bounds.isEmpty()) {
return false;
}
}
if (subset && !bounds.intersect(*subset)) {
// perhaps we could return true + empty-bitmap?
return false;
}
return as_IB(this)->onReadPixels(bitmap, bounds);
}
GrTexture* SkImage::getTexture() {
return as_IB(this)->onGetTexture();
}
SkData* SkImage::encode(SkImageEncoder::Type type, int quality) const {
SkBitmap bm;
if (as_IB(this)->getROPixels(&bm)) {
return SkImageEncoder::EncodeData(bm, type, quality);
}
return NULL;
}
///////////////////////////////////////////////////////////////////////////////
static bool raster_canvas_supports(const SkImageInfo& info) {
switch (info.fColorType) {
case kPMColor_SkColorType:
return kUnpremul_SkAlphaType != info.fAlphaType;
case kRGB_565_SkColorType:
return true;
case kAlpha_8_SkColorType:
return true;
default:
break;
}
return false;
}
bool SkImage_Base::onReadPixels(SkBitmap* bitmap, const SkIRect& subset) const {
SkImageInfo info;
if (bitmap->pixelRef()) {
if (!bitmap->asImageInfo(&info)) {
return false;
}
if (!raster_canvas_supports(info)) {
return false;
}
} else {
SkImageInfo info = SkImageInfo::MakeN32Premul(subset.width(),
subset.height());
SkBitmap tmp;
if (!tmp.allocPixels(info)) {
return false;
}
*bitmap = tmp;
}
SkRect srcR, dstR;
srcR.set(subset);
dstR = srcR;
dstR.offset(-dstR.left(), -dstR.top());
SkCanvas canvas(*bitmap);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kClear_Mode);
canvas.drawRect(dstR, paint);
const_cast<SkImage_Base*>(this)->onDrawRectToRect(&canvas, &srcR, dstR, NULL);
return true;
}
|
