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
|
/*
* Copyright 2015 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 "SkCanvas.h"
#include "SkSurface.h"
static sk_sp<SkImage> make_image(SkCanvas* rootCanvas, SkColor color) {
SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
auto surface(rootCanvas->makeSurface(info));
if (!surface) {
surface = SkSurface::MakeRaster(info);
}
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(color);
surface->getCanvas()->drawIRect(SkIRect::MakeXYWH(25, 25, 50, 50), paint);
return surface->makeImageSnapshot();
}
DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
sk_sp<SkImage> redImage = make_image(canvas, SK_ColorRED);
SkMatrix translate = SkMatrix::MakeTrans(100.0f, 0.0f);
SkMatrix rotate;
rotate.setRotate(45.0f);
sk_sp<SkShader> redImageShader = redImage->makeShader(&translate);
sk_sp<SkShader> redLocalMatrixShader = redImageShader->makeWithLocalMatrix(rotate);
// Rotate about the origin will happen first.
SkPaint paint;
paint.setShader(redLocalMatrixShader);
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
sk_sp<SkImage> blueImage = make_image(canvas, SK_ColorBLUE);
sk_sp<SkShader> blueImageShader = blueImage->makeShader(&rotate);
sk_sp<SkShader> blueLocalMatrixShader = blueImageShader->makeWithLocalMatrix(translate);
// Translate will happen first.
paint.setShader(blueLocalMatrixShader);
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
canvas->translate(100.0f, 0.0f);
// Use isAImage() and confirm that the shaders will draw exactly the same (to the right by 100).
SkShader::TileMode mode[2];
SkMatrix matrix;
SkImage* image = redLocalMatrixShader->isAImage(&matrix, mode);
paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
image = blueLocalMatrixShader->isAImage(&matrix, mode);
paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
}
|
