1 /*
2 * Copyright 2016 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 "sk_tool_utils.h"
10 #include "SkBlurImageFilter.h"
11 #include "SkCanvas.h"
12 #include "SkColorFilter.h"
13 #include "SkColorFilterImageFilter.h"
14 #include "SkDropShadowImageFilter.h"
15 #include "SkSurface.h"
16
17 ///////////////////////////////////////////////////////////////////////////////
18
show_bounds(SkCanvas * canvas,const SkIRect & subset,const SkIRect & clip)19 static void show_bounds(SkCanvas* canvas, const SkIRect& subset, const SkIRect& clip) {
20 SkIRect rects[] { subset, clip };
21 SkColor colors[] { SK_ColorRED, SK_ColorBLUE };
22
23 SkPaint paint;
24 paint.setStyle(SkPaint::kStroke_Style);
25
26 for (size_t i = 0; i < SK_ARRAY_COUNT(rects); ++i) {
27 paint.setColor(colors[i]);
28 canvas->drawRect(SkRect::Make(rects[i]), paint);
29 }
30 }
31
32 // In this GM, we're going to feed the inner portion of a 100x100 checkboard
33 // (i.e., strip off a 25-wide border) through the makeWithFilter method.
34 // We'll then draw the appropriate subset of the result to the screen at the
35 // given offset.
36 class ImageMakeWithFilterGM : public skiagm::GM {
37 public:
ImageMakeWithFilterGM()38 ImageMakeWithFilterGM () {}
39
40 protected:
onShortName()41 SkString onShortName() override {
42 return SkString("imagemakewithfilter");
43 }
44
onISize()45 SkISize onISize() override { return SkISize::Make(440, 530); }
46
onDraw(SkCanvas * canvas)47 void onDraw(SkCanvas* canvas) override {
48 auto cf = SkColorFilter::MakeModeFilter(SK_ColorGREEN, SkBlendMode::kSrc);
49 sk_sp<SkImageFilter> filters[] = {
50 SkColorFilterImageFilter::Make(std::move(cf), nullptr),
51 SkBlurImageFilter::Make(2.0f, 2.0f, nullptr),
52 SkDropShadowImageFilter::Make(
53 10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE,
54 SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode,
55 nullptr),
56 };
57
58 SkIRect clipBounds[] {
59 { -20, -20, 100, 100 },
60 { 0, 0, 75, 75 },
61 { 20, 20, 100, 100 },
62 { -20, -20, 50, 50 },
63 { 20, 20, 50, 50 },
64 };
65
66 SkImageInfo info = SkImageInfo::MakeN32(100, 100, kPremul_SkAlphaType);
67 SkScalar MARGIN = SkIntToScalar(40);
68 SkScalar DX = info.width() + MARGIN;
69 SkScalar DY = info.height() + MARGIN;
70
71 canvas->translate(MARGIN, MARGIN);
72
73 sk_sp<SkSurface> surface = sk_tool_utils::makeSurface(canvas, info);
74 sk_tool_utils::draw_checkerboard(surface->getCanvas());
75 sk_sp<SkImage> source = surface->makeImageSnapshot();
76
77 for (auto clipBound : clipBounds) {
78 canvas->save();
79 for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
80 SkIRect subset = SkIRect::MakeXYWH(25, 25, 50, 50);
81 SkIRect outSubset;
82 SkIPoint offset;
83 sk_sp<SkImage> result = source->makeWithFilter(filters[i].get(), subset, clipBound,
84 &outSubset, &offset);
85 SkASSERT(result);
86 SkASSERT(source->isTextureBacked() == result->isTextureBacked());
87 result = result->makeSubset(outSubset);
88 canvas->drawImage(result.get(), SkIntToScalar(offset.fX), SkIntToScalar(offset.fY));
89 show_bounds(canvas, SkIRect::MakeXYWH(offset.x(), offset.y(), outSubset.width(),
90 outSubset.height()), clipBound);
91 canvas->translate(DX, 0);
92 }
93 canvas->restore();
94 canvas->translate(0, DY);
95 }
96 }
97
98 private:
99 typedef GM INHERITED;
100 };
101 DEF_GM( return new ImageMakeWithFilterGM; )
102