1 /*
2 * Copyright 2013 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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkColorSpace.h"
12 #include "include/core/SkFont.h"
13 #include "include/core/SkImage.h"
14 #include "include/core/SkImageFilter.h"
15 #include "include/core/SkPaint.h"
16 #include "include/core/SkPicture.h"
17 #include "include/core/SkPictureRecorder.h"
18 #include "include/core/SkRect.h"
19 #include "include/core/SkRefCnt.h"
20 #include "include/core/SkScalar.h"
21 #include "include/core/SkSize.h"
22 #include "include/core/SkString.h"
23 #include "include/core/SkTypeface.h"
24 #include "include/effects/SkImageFilters.h"
25 #include "tools/ToolUtils.h"
26 #include "tools/fonts/FontToolUtils.h"
27
28 // This GM exercises the SkPictureImageFilter ImageFilter class.
29
fill_rect_filtered(SkCanvas * canvas,const SkRect & clipRect,sk_sp<SkImageFilter> filter)30 static void fill_rect_filtered(SkCanvas* canvas,
31 const SkRect& clipRect,
32 sk_sp<SkImageFilter> filter) {
33 SkPaint paint;
34 paint.setImageFilter(filter);
35 canvas->save();
36 canvas->clipRect(clipRect);
37 canvas->drawPaint(paint);
38 canvas->restore();
39 }
40
make_picture()41 static sk_sp<SkPicture> make_picture() {
42 SkPictureRecorder recorder;
43 SkCanvas* canvas = recorder.beginRecording(100, 100);
44 SkPaint paint;
45 paint.setColor(0xFFFFFFFF);
46 SkFont font(ToolUtils::DefaultPortableTypeface(), 96.0f);
47 canvas->drawString("e", 20.0f, 70.0f, font, paint);
48 return recorder.finishRecordingAsPicture();
49 }
50
51 // Create a picture that will draw LCD text
make_LCD_picture()52 static sk_sp<SkPicture> make_LCD_picture() {
53 SkPictureRecorder recorder;
54 SkCanvas* canvas = recorder.beginRecording(100, 100);
55 canvas->clear(SK_ColorTRANSPARENT);
56 SkPaint paint;
57 paint.setColor(0xFFFFFFFF);
58 // this has to be small enough that it doesn't become a path
59 SkFont font(ToolUtils::DefaultPortableTypeface(), 36.0f);
60 font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
61 canvas->drawString("e", 20.0f, 70.0f, font, paint);
62 return recorder.finishRecordingAsPicture();
63 }
64
65 class PictureImageFilterGM : public skiagm::GM {
66 public:
PictureImageFilterGM()67 PictureImageFilterGM() { }
68
69 protected:
getName() const70 SkString getName() const override { return SkString("pictureimagefilter"); }
71
getISize()72 SkISize getISize() override { return SkISize::Make(600, 300); }
73
onOnceBeforeDraw()74 void onOnceBeforeDraw() override {
75 fPicture = make_picture();
76 fLCDPicture = make_LCD_picture();
77 }
78
make(sk_sp<SkPicture> pic,SkRect r,const SkSamplingOptions & sampling)79 sk_sp<SkImageFilter> make(sk_sp<SkPicture> pic, SkRect r, const SkSamplingOptions& sampling) {
80 SkISize dim = { SkScalarRoundToInt(r.width()), SkScalarRoundToInt(r.height()) };
81 auto img = SkImages::DeferredFromPicture(
82 pic, dim, nullptr, nullptr, SkImages::BitDepth::kU8, SkColorSpace::MakeSRGB());
83 return SkImageFilters::Image(img, r, r, sampling);
84 }
make(const SkSamplingOptions & sampling)85 sk_sp<SkImageFilter> make(const SkSamplingOptions& sampling) {
86 return make(fPicture, fPicture->cullRect(), sampling);
87 }
88
onDraw(SkCanvas * canvas)89 void onDraw(SkCanvas* canvas) override {
90 canvas->clear(SK_ColorGRAY);
91 {
92 SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
93 SkRect emptyRect = SkRect::MakeXYWH(20, 20, 0, 0);
94 SkRect bounds = SkRect::MakeXYWH(0, 0, 100, 100);
95 sk_sp<SkImageFilter> pictureSource(SkImageFilters::Picture(fPicture));
96 sk_sp<SkImageFilter> pictureSourceSrcRect(SkImageFilters::Picture(fPicture, srcRect));
97 sk_sp<SkImageFilter> pictureSourceEmptyRect(SkImageFilters::Picture(fPicture,
98 emptyRect));
99 sk_sp<SkImageFilter> pictureSourceResampled = make(SkSamplingOptions(SkFilterMode::kLinear));
100 sk_sp<SkImageFilter> pictureSourcePixelated = make(SkSamplingOptions());
101
102 canvas->save();
103 // Draw the picture unscaled.
104 fill_rect_filtered(canvas, bounds, pictureSource);
105 canvas->translate(SkIntToScalar(100), 0);
106
107 // Draw an unscaled subset of the source picture.
108 fill_rect_filtered(canvas, bounds, pictureSourceSrcRect);
109 canvas->translate(SkIntToScalar(100), 0);
110
111 // Draw the picture to an empty rect (should draw nothing).
112 fill_rect_filtered(canvas, bounds, pictureSourceEmptyRect);
113 canvas->translate(SkIntToScalar(100), 0);
114
115 // Draw the LCD picture to a layer
116 {
117 SkPaint stroke;
118 stroke.setStyle(SkPaint::kStroke_Style);
119
120 canvas->drawRect(bounds, stroke);
121
122 SkPaint paint;
123 paint.setImageFilter(make(fLCDPicture, fPicture->cullRect(), SkSamplingOptions()));
124
125 canvas->scale(4, 4);
126 canvas->translate(-0.9f*srcRect.fLeft, -2.45f*srcRect.fTop);
127
128 canvas->saveLayer(&bounds, &paint);
129 canvas->restore();
130 }
131
132 canvas->restore();
133
134 // Draw the picture scaled
135 canvas->translate(0, SkIntToScalar(100));
136 canvas->scale(200 / srcRect.width(), 200 / srcRect.height());
137 canvas->translate(-srcRect.fLeft, -srcRect.fTop);
138 fill_rect_filtered(canvas, srcRect, pictureSource);
139
140 // Draw the picture scaled, but rasterized at original resolution
141 canvas->translate(srcRect.width(), 0);
142 fill_rect_filtered(canvas, srcRect, pictureSourceResampled);
143
144 // Draw the picture scaled, pixelated
145 canvas->translate(srcRect.width(), 0);
146 fill_rect_filtered(canvas, srcRect, pictureSourcePixelated);
147 }
148 }
149
150 private:
151 sk_sp<SkPicture> fPicture;
152 sk_sp<SkPicture> fLCDPicture;
153
154 using INHERITED = GM;
155 };
156
157 ///////////////////////////////////////////////////////////////////////////////
158
159 DEF_GM( return new PictureImageFilterGM; )
160