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 "SkBlurImageFilter.h"
11 #include "SkColorFilterImageFilter.h"
12 #include "SkModeColorFilter.h"
13 #include "SkMorphologyImageFilter.h"
14 #include "SkOffsetImageFilter.h"
15 #include "SkSurface.h"
16 #include "sk_tool_utils.h"
17
make_image(SkCanvas * rootCanvas)18 static sk_sp<SkImage> make_image(SkCanvas* rootCanvas) {
19 SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
20 auto surface(sk_tool_utils::makeSurface(rootCanvas, info));
21
22 SkPaint paint;
23 paint.setAntiAlias(true);
24 paint.setColor(SK_ColorRED);
25 surface->getCanvas()->drawCircle(50, 50, 50, paint);
26 return surface->makeImageSnapshot();
27 }
28
show_image(SkCanvas * canvas,SkImage * image,sk_sp<SkImageFilter> filter)29 static void show_image(SkCanvas* canvas, SkImage* image, sk_sp<SkImageFilter> filter) {
30 SkPaint paint;
31 paint.setStyle(SkPaint::kStroke_Style);
32 SkRect r = SkRect::MakeIWH(image->width(), image->height()).makeOutset(SK_ScalarHalf,
33 SK_ScalarHalf);
34 canvas->drawRect(r, paint);
35
36 paint.setStyle(SkPaint::kFill_Style);
37 paint.setImageFilter(filter);
38 canvas->drawImage(image, 0, 0, &paint);
39 }
40
41 typedef sk_sp<SkImageFilter> (*ImageFilterFactory)();
42
43 // +[]{...} did not work on windows (VS)
44 // (ImageFilterFactory)[]{...} did not work on linux (gcc)
45 // hence this cast function
IFCCast(T arg)46 template <typename T> ImageFilterFactory IFCCast(T arg) { return arg; }
47
48 // Show the effect of localmatriximagefilter with various matrices, on various filters
49 DEF_SIMPLE_GM(localmatriximagefilter, canvas, 640, 640) {
50 sk_sp<SkImage> image0(make_image(canvas));
51
52 const ImageFilterFactory factories[] = {
__anon24de3c250102null53 IFCCast([]{ return SkBlurImageFilter::Make(8, 8, nullptr); }),
__anon24de3c250202null54 IFCCast([]{ return SkDilateImageFilter::Make(8, 8, nullptr); }),
__anon24de3c250302null55 IFCCast([]{ return SkErodeImageFilter::Make(8, 8, nullptr); }),
__anon24de3c250402null56 IFCCast([]{ return SkOffsetImageFilter::Make(8, 8, nullptr); }),
57 };
58
59 const SkMatrix matrices[] = {
60 SkMatrix::MakeScale(SK_ScalarHalf, SK_ScalarHalf),
61 SkMatrix::MakeScale(2, 2),
62 SkMatrix::MakeTrans(10, 10)
63 };
64
65 const SkScalar spacer = image0->width() * 3.0f / 2;
66
67 canvas->translate(40, 40);
68 for (auto&& factory : factories) {
69 sk_sp<SkImageFilter> filter(factory());
70
71 canvas->save();
72 show_image(canvas, image0.get(), filter);
73 for (const auto& matrix : matrices) {
74 sk_sp<SkImageFilter> localFilter(filter->makeWithLocalMatrix(matrix));
75 canvas->translate(spacer, 0);
76 show_image(canvas, image0.get(), std::move(localFilter));
77 }
78 canvas->restore();
79 canvas->translate(0, spacer);
80 }
81 }
82