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