1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkFilterQuality.h"
12 #include "include/core/SkImage.h"
13 #include "include/core/SkImageInfo.h"
14 #include "include/core/SkMatrix.h"
15 #include "include/core/SkPaint.h"
16 #include "include/core/SkRect.h"
17 #include "include/core/SkRefCnt.h"
18 #include "include/core/SkShader.h"
19 #include "include/core/SkSurface.h"
20 #include "include/core/SkTileMode.h"
21 #include "tools/Resources.h"
22 #include "tools/ToolUtils.h"
23
make_image(SkCanvas * rootCanvas,SkColor color)24 static sk_sp<SkImage> make_image(SkCanvas* rootCanvas, SkColor color) {
25 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
26 auto surface(ToolUtils::makeSurface(rootCanvas, info));
27
28 SkPaint paint;
29 paint.setAntiAlias(true);
30 paint.setColor(color);
31 surface->getCanvas()->drawIRect(SkIRect::MakeXYWH(25, 25, 50, 50), paint);
32 return surface->makeImageSnapshot();
33 }
34
35 DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
36 sk_sp<SkImage> redImage = make_image(canvas, SK_ColorRED);
37 SkMatrix translate = SkMatrix::Translate(100.0f, 0.0f);
38 SkMatrix rotate;
39 rotate.setRotate(45.0f);
40 sk_sp<SkShader> redImageShader = redImage->makeShader(&translate);
41 sk_sp<SkShader> redLocalMatrixShader = redImageShader->makeWithLocalMatrix(rotate);
42
43 // Rotate about the origin will happen first.
44 SkPaint paint;
45 paint.setShader(redLocalMatrixShader);
46 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
47
48 sk_sp<SkImage> blueImage = make_image(canvas, SK_ColorBLUE);
49 sk_sp<SkShader> blueImageShader = blueImage->makeShader(&rotate);
50 sk_sp<SkShader> blueLocalMatrixShader = blueImageShader->makeWithLocalMatrix(translate);
51
52 // Translate will happen first.
53 paint.setShader(blueLocalMatrixShader);
54 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
55
56 canvas->translate(100.0f, 0.0f);
57
58 // Use isAImage() and confirm that the shaders will draw exactly the same (to the right by 100).
59 SkTileMode mode[2];
60 SkMatrix matrix;
61 SkImage* image = redLocalMatrixShader->isAImage(&matrix, mode);
62 paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
63 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
64 image = blueLocalMatrixShader->isAImage(&matrix, mode);
65 paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
66 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
67 }
68
69 DEF_SIMPLE_GM(localmatriximageshader_filtering, canvas, 256, 256) {
70 // Test that filtering decisions (eg bicubic for upscale) are made correctly when the scale
71 // comes from a local matrix shader.
72 auto image = GetResourceAsImage("images/mandrill_256.png");
73 SkPaint p;
74 p.setFilterQuality(kHigh_SkFilterQuality);
75 SkMatrix m = SkMatrix::Scale(2, 2);
76 p.setShader(image->makeShader()->makeWithLocalMatrix(m));
77
78 canvas->drawRect(SkRect::MakeXYWH(0, 0, 256, 256), p);
79 }
80
