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.h"
9 #include "Resources.h"
10 #include "SkCanvas.h"
11 #include "SkSurface.h"
12 #include "sk_tool_utils.h"
13
make_image(SkCanvas * rootCanvas,SkColor color)14 static sk_sp<SkImage> make_image(SkCanvas* rootCanvas, SkColor color) {
15 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
16 auto surface(sk_tool_utils::makeSurface(rootCanvas, info));
17
18 SkPaint paint;
19 paint.setAntiAlias(true);
20 paint.setColor(color);
21 surface->getCanvas()->drawIRect(SkIRect::MakeXYWH(25, 25, 50, 50), paint);
22 return surface->makeImageSnapshot();
23 }
24
25 DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
26 sk_sp<SkImage> redImage = make_image(canvas, SK_ColorRED);
27 SkMatrix translate = SkMatrix::MakeTrans(100.0f, 0.0f);
28 SkMatrix rotate;
29 rotate.setRotate(45.0f);
30 sk_sp<SkShader> redImageShader = redImage->makeShader(&translate);
31 sk_sp<SkShader> redLocalMatrixShader = redImageShader->makeWithLocalMatrix(rotate);
32
33 // Rotate about the origin will happen first.
34 SkPaint paint;
35 paint.setShader(redLocalMatrixShader);
36 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
37
38 sk_sp<SkImage> blueImage = make_image(canvas, SK_ColorBLUE);
39 sk_sp<SkShader> blueImageShader = blueImage->makeShader(&rotate);
40 sk_sp<SkShader> blueLocalMatrixShader = blueImageShader->makeWithLocalMatrix(translate);
41
42 // Translate will happen first.
43 paint.setShader(blueLocalMatrixShader);
44 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
45
46 canvas->translate(100.0f, 0.0f);
47
48 // Use isAImage() and confirm that the shaders will draw exactly the same (to the right by 100).
49 SkShader::TileMode mode[2];
50 SkMatrix matrix;
51 SkImage* image = redLocalMatrixShader->isAImage(&matrix, mode);
52 paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
53 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
54 image = blueLocalMatrixShader->isAImage(&matrix, mode);
55 paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
56 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
57 }
58
59 DEF_SIMPLE_GM(localmatriximageshader_filtering, canvas, 256, 256) {
60 // Test that filtering decisions (eg bicubic for upscale) are made correctly when the scale
61 // comes from a local matrix shader.
62 auto image = GetResourceAsImage("images/mandrill_256.png");
63 SkPaint p;
64 p.setFilterQuality(kHigh_SkFilterQuality);
65 SkMatrix m = SkMatrix::MakeScale(2.0f);
66 p.setShader(image->makeShader()->makeWithLocalMatrix(m));
67
68 canvas->drawRect(SkRect::MakeXYWH(0, 0, 256, 256), p);
69 }
70
