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
|
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "sk_tool_utils.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkImageGenerator.h"
#include "SkMakeUnique.h"
#include "SkSurface.h"
namespace {
const SkISize kSize = SkISize::Make(100, 100);
const SkIRect kSubset = SkIRect::MakeLTRB(25, 25, 75, 75);
const SkRect kDest = SkRect::MakeXYWH(10, 10, 100, 100);
sk_sp<SkImage> make_mask(const sk_sp<SkSurface>& surface) {
sk_tool_utils::draw_checkerboard(surface->getCanvas(), 0x80808080, 0x00000000, 5);
return surface->makeImageSnapshot();
}
class MaskGenerator final : public SkImageGenerator {
public:
MaskGenerator(const SkImageInfo& info) : INHERITED(info) {}
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, const Options&)
override {
SkImageInfo surfaceInfo = info;
if (kAlpha_8_SkColorType == info.colorType()) {
surfaceInfo = surfaceInfo.makeColorSpace(nullptr);
}
make_mask(SkSurface::MakeRasterDirect(surfaceInfo, pixels, rowBytes));
return true;
}
private:
typedef SkImageGenerator INHERITED;
};
using MakerT = sk_sp<SkImage>(*)(SkCanvas*, const SkImageInfo&);
const MakerT makers[] = {
// SkImage_Raster
[](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
return make_mask(SkSurface::MakeRaster(info));
},
// SkImage_Gpu
[](SkCanvas* c, const SkImageInfo& info) -> sk_sp<SkImage> {
sk_sp<SkSurface> surface;
#if SK_SUPPORT_GPU
surface = SkSurface::MakeRenderTarget(c->getGrContext(), SkBudgeted::kNo, info);
#endif
return make_mask(surface ? surface : SkSurface::MakeRaster(info));
},
// SkImage_Lazy
[](SkCanvas*, const SkImageInfo& info) -> sk_sp<SkImage> {
return SkImage::MakeFromGenerator(skstd::make_unique<MaskGenerator>(info));
},
};
} // anonymous ns
// Checks whether subset SkImages preserve the original color type (A8 in this case).
DEF_SIMPLE_GM(imagemasksubset, canvas, 480, 480) {
SkPaint paint;
paint.setColor(0xff00ff00);
const SkImageInfo info = SkImageInfo::MakeA8(kSize.width(), kSize.height());
for (size_t i = 0; i < SK_ARRAY_COUNT(makers); ++i) {
sk_sp<SkImage> image = makers[i](canvas, info);
if (image) {
canvas->drawImageRect(image, SkRect::Make(kSubset), kDest, &paint);
sk_sp<SkImage> subset = image->makeSubset(kSubset);
canvas->drawImageRect(subset, kDest.makeOffset(kSize.width() * 1.5f, 0), &paint);
}
canvas->translate(0, kSize.height() * 1.5f);
}
}
|
