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.h"
9 #include "sk_tool_utils.h"
10
11 #include "SkPictureImageFilter.h"
12 #include "SkPictureRecorder.h"
13
14 // This GM exercises the SkPictureImageFilter ImageFilter class.
15
fill_rect_filtered(SkCanvas * canvas,const SkRect & clipRect,sk_sp<SkImageFilter> filter)16 static void fill_rect_filtered(SkCanvas* canvas,
17 const SkRect& clipRect,
18 sk_sp<SkImageFilter> filter) {
19 SkPaint paint;
20 paint.setImageFilter(filter);
21 canvas->save();
22 canvas->clipRect(clipRect);
23 canvas->drawPaint(paint);
24 canvas->restore();
25 }
26
make_picture()27 static sk_sp<SkPicture> make_picture() {
28 SkPictureRecorder recorder;
29 SkCanvas* canvas = recorder.beginRecording(100, 100, nullptr, 0);
30 SkPaint paint;
31 paint.setAntiAlias(true);
32 sk_tool_utils::set_portable_typeface(&paint);
33 paint.setColor(0xFFFFFFFF);
34 paint.setTextSize(SkIntToScalar(96));
35 const char* str = "e";
36 canvas->drawString(str, SkIntToScalar(20), SkIntToScalar(70), paint);
37 return recorder.finishRecordingAsPicture();
38 }
39
40 // Create a picture that will draw LCD text
make_LCD_picture()41 static sk_sp<SkPicture> make_LCD_picture() {
42 SkPictureRecorder recorder;
43 SkCanvas* canvas = recorder.beginRecording(100, 100, nullptr, 0);
44 canvas->clear(SK_ColorTRANSPARENT);
45 SkPaint paint;
46 paint.setLCDRenderText(true); // want LCD
47 paint.setAntiAlias(true); // need AA for LCD
48 sk_tool_utils::set_portable_typeface(&paint);
49 paint.setColor(0xFFFFFFFF);
50 // this has to be small enough that it doesn't become a path
51 paint.setTextSize(SkIntToScalar(36));
52 const char* str = "e";
53 canvas->drawString(str, SkIntToScalar(20), SkIntToScalar(70), paint);
54 return recorder.finishRecordingAsPicture();
55 }
56
57 class PictureImageFilterGM : public skiagm::GM {
58 public:
PictureImageFilterGM()59 PictureImageFilterGM() { }
60
61 protected:
onShortName()62 SkString onShortName() override {
63 return SkString("pictureimagefilter");
64 }
65
onISize()66 SkISize onISize() override { return SkISize::Make(600, 300); }
67
onOnceBeforeDraw()68 void onOnceBeforeDraw() override {
69 fPicture = make_picture();
70 fLCDPicture = make_LCD_picture();
71 }
72
onDraw(SkCanvas * canvas)73 void onDraw(SkCanvas* canvas) override {
74 canvas->clear(SK_ColorGRAY);
75 {
76 SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
77 SkRect emptyRect = SkRect::MakeXYWH(20, 20, 0, 0);
78 SkRect bounds = SkRect::MakeXYWH(0, 0, 100, 100);
79 sk_sp<SkImageFilter> pictureSource(SkPictureImageFilter::Make(fPicture));
80 sk_sp<SkImageFilter> pictureSourceSrcRect(SkPictureImageFilter::Make(fPicture,
81 srcRect));
82 sk_sp<SkImageFilter> pictureSourceEmptyRect(SkPictureImageFilter::Make(fPicture,
83 emptyRect));
84 sk_sp<SkImageFilter> pictureSourceResampled(SkPictureImageFilter::MakeForLocalSpace(
85 fPicture,
86 fPicture->cullRect(),
87 kLow_SkFilterQuality));
88 sk_sp<SkImageFilter> pictureSourcePixelated(SkPictureImageFilter::MakeForLocalSpace(
89 fPicture,
90 fPicture->cullRect(),
91 kNone_SkFilterQuality));
92
93 canvas->save();
94 // Draw the picture unscaled.
95 fill_rect_filtered(canvas, bounds, pictureSource);
96 canvas->translate(SkIntToScalar(100), 0);
97
98 // Draw an unscaled subset of the source picture.
99 fill_rect_filtered(canvas, bounds, pictureSourceSrcRect);
100 canvas->translate(SkIntToScalar(100), 0);
101
102 // Draw the picture to an empty rect (should draw nothing).
103 fill_rect_filtered(canvas, bounds, pictureSourceEmptyRect);
104 canvas->translate(SkIntToScalar(100), 0);
105
106 // Draw the LCD picture to a layer
107 {
108 SkPaint stroke;
109 stroke.setStyle(SkPaint::kStroke_Style);
110
111 canvas->drawRect(bounds, stroke);
112
113 SkPaint paint;
114 paint.setImageFilter(SkPictureImageFilter::MakeForLocalSpace(
115 fLCDPicture,
116 fPicture->cullRect(),
117 kNone_SkFilterQuality));
118
119 canvas->scale(4, 4);
120 canvas->translate(-0.9f*srcRect.fLeft, -2.45f*srcRect.fTop);
121
122 canvas->saveLayerPreserveLCDTextRequests(&bounds, &paint);
123 canvas->restore();
124 }
125
126 canvas->restore();
127
128 // Draw the picture scaled
129 canvas->translate(0, SkIntToScalar(100));
130 canvas->scale(200 / srcRect.width(), 200 / srcRect.height());
131 canvas->translate(-srcRect.fLeft, -srcRect.fTop);
132 fill_rect_filtered(canvas, srcRect, pictureSource);
133
134 // Draw the picture scaled, but rasterized at original resolution
135 canvas->translate(srcRect.width(), 0);
136 fill_rect_filtered(canvas, srcRect, pictureSourceResampled);
137
138 // Draw the picture scaled, pixelated
139 canvas->translate(srcRect.width(), 0);
140 fill_rect_filtered(canvas, srcRect, pictureSourcePixelated);
141 }
142 }
143
144 private:
145 sk_sp<SkPicture> fPicture;
146 sk_sp<SkPicture> fLCDPicture;
147
148 typedef GM INHERITED;
149 };
150
151 ///////////////////////////////////////////////////////////////////////////////
152
153 DEF_GM( return new PictureImageFilterGM; )
154