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 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
