1 /* 2 * Copyright 2017 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 10 #include "SkBlurMaskFilter.h" 11 #include "SkColorFilter.h" 12 #include "SkImage.h" 13 #include "SkShader.h" 14 15 static SkBitmap make_alpha_image(int w, int h) { 16 SkBitmap bm; 17 bm.allocPixels(SkImageInfo::MakeA8(w, h)); 18 bm.eraseARGB(10, 0, 0 , 0); 19 for (int y = 0; y < bm.height(); ++y) { 20 for (int x = y; x < bm.width(); ++x) { 21 *bm.getAddr8(x, y) = 0xFF; 22 } 23 } 24 bm.setImmutable(); 25 return bm; 26 } 27 28 static sk_sp<SkColorFilter> make_color_filter() { 29 SkScalar colorMatrix[20] = { 30 1, 0, 0, 0, 0, 31 0, 1, 0, 0, 0, 32 0, 0, 0.5, 0.5, 0, 33 0, 0, 0.5, 0.5, 0}; // mix G and A. 34 return SkColorFilter::MakeMatrixFilterRowMajor255(colorMatrix); 35 } 36 37 DEF_SIMPLE_GM(alpha_image, canvas, 256, 256) { 38 auto image = SkImage::MakeFromBitmap(make_alpha_image(96, 96)); 39 SkPaint paint; 40 41 paint.setColorFilter(make_color_filter()); 42 paint.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle, 10.0f, 0)); 43 canvas->drawImage(image.get(), 16, 16, &paint); 44 45 paint.setColorFilter(nullptr); 46 paint.setShader(SkShader::MakeColorShader(SK_ColorCYAN)); 47 canvas->drawImage(image.get(), 144, 16, &paint); 48 49 paint.setColorFilter(make_color_filter()); 50 canvas->drawImage(image.get(), 16, 144, &paint); 51 52 paint.setMaskFilter(nullptr); 53 canvas->drawImage(image.get(), 144, 144, &paint); 54 } 55
