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 "SkColorFilter.h"
11 #include "SkImage.h"
12 #include "SkMaskFilter.h"
13 #include "SkShader.h"
14
make_alpha_image(int w,int h)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
make_color_filter()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(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 10.0f));
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