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 "SkCanvas.h"
10 #include "SkSurface.h"
11
make_image(SkCanvas * rootCanvas,SkColor color)12 static sk_sp<SkImage> make_image(SkCanvas* rootCanvas, SkColor color) {
13 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
14 auto surface(rootCanvas->makeSurface(info));
15 if (!surface) {
16 surface = SkSurface::MakeRaster(info);
17 }
18
19 SkPaint paint;
20 paint.setAntiAlias(true);
21 paint.setColor(color);
22 surface->getCanvas()->drawIRect(SkIRect::MakeXYWH(25, 25, 50, 50), paint);
23 return surface->makeImageSnapshot();
24 }
25
26 DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
27 sk_sp<SkImage> redImage = make_image(canvas, SK_ColorRED);
28 SkMatrix translate = SkMatrix::MakeTrans(100.0f, 0.0f);
29 SkMatrix rotate;
30 rotate.setRotate(45.0f);
31 sk_sp<SkShader> redImageShader = redImage->makeShader(SkShader::TileMode::kClamp_TileMode,
32 SkShader::TileMode::kClamp_TileMode, &translate);
33 sk_sp<SkShader> redLocalMatrixShader = redImageShader->makeWithLocalMatrix(rotate);
34
35 // Rotate about the origin will happen first.
36 SkPaint paint;
37 paint.setShader(redLocalMatrixShader);
38 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
39
40 sk_sp<SkImage> blueImage = make_image(canvas, SK_ColorBLUE);
41 sk_sp<SkShader> blueImageShader = blueImage->makeShader(SkShader::TileMode::kClamp_TileMode,
42 SkShader::TileMode::kClamp_TileMode, &rotate);
43 sk_sp<SkShader> blueLocalMatrixShader = blueImageShader->makeWithLocalMatrix(translate);
44
45 // Translate will happen first.
46 paint.setShader(blueLocalMatrixShader);
47 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
48
49 canvas->translate(100.0f, 0.0f);
50
51 // Use isAImage() and confirm that the shaders will draw exactly the same (to the right by 100).
52 SkShader::TileMode mode[2];
53 SkMatrix matrix;
54 SkImage* image = redLocalMatrixShader->isAImage(&matrix, mode);
55 paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
56 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
57 image = blueLocalMatrixShader->isAImage(&matrix, mode);
58 paint.setShader(image->makeShader(mode[0], mode[1], &matrix));
59 canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
60 }
61