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 "SkOffsetImageFilter.h"
10 #include "SkBitmapSource.h"
11
12 #define WIDTH 600
13 #define HEIGHT 100
14 #define MARGIN 12
15
16 namespace skiagm {
17
18 class OffsetImageFilterGM : public GM {
19 public:
OffsetImageFilterGM()20 OffsetImageFilterGM() : fInitialized(false) {
21 this->setBGColor(0xFF000000);
22 }
23
24 protected:
onShortName()25 virtual SkString onShortName() {
26 return SkString("offsetimagefilter");
27 }
28
make_bitmap()29 void make_bitmap() {
30 fBitmap.allocN32Pixels(80, 80);
31 SkCanvas canvas(fBitmap);
32 canvas.clear(0x00000000);
33 SkPaint paint;
34 paint.setAntiAlias(true);
35 paint.setColor(0xD000D000);
36 paint.setTextSize(SkIntToScalar(96));
37 const char* str = "e";
38 canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
39 }
40
make_checkerboard()41 void make_checkerboard() {
42 fCheckerboard.allocN32Pixels(80, 80);
43 SkCanvas canvas(fCheckerboard);
44 canvas.clear(0x00000000);
45 SkPaint darkPaint;
46 darkPaint.setColor(0xFF404040);
47 SkPaint lightPaint;
48 lightPaint.setColor(0xFFA0A0A0);
49 for (int y = 0; y < 80; y += 16) {
50 for (int x = 0; x < 80; x += 16) {
51 canvas.save();
52 canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
53 canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
54 canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
55 canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
56 canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
57 canvas.restore();
58 }
59 }
60 }
61
onISize()62 virtual SkISize onISize() {
63 return SkISize::Make(WIDTH, HEIGHT);
64 }
65
drawClippedBitmap(SkCanvas * canvas,const SkBitmap & bitmap,const SkPaint & paint,SkScalar scale,const SkIRect & cropRect)66 void drawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, SkScalar scale, const SkIRect& cropRect) {
67 canvas->save();
68 SkRect clipRect = SkRect::MakeWH(
69 SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
70 canvas->clipRect(clipRect);
71 canvas->scale(scale, scale);
72 canvas->drawBitmap(bitmap, 0, 0, &paint);
73 canvas->restore();
74 SkPaint strokePaint;
75 strokePaint.setStyle(SkPaint::kStroke_Style);
76 strokePaint.setColor(SK_ColorRED);
77
78 // Draw a boundary rect around the intersection of the clip rect
79 // and crop rect.
80 SkMatrix scaleMatrix;
81 scaleMatrix.setScale(scale, scale);
82 SkRect cropRectFloat;
83 scaleMatrix.mapRect(&cropRectFloat, SkRect::Make(cropRect));
84 clipRect.intersect(cropRectFloat);
85 canvas->drawRect(clipRect, strokePaint);
86 }
87
onDraw(SkCanvas * canvas)88 virtual void onDraw(SkCanvas* canvas) {
89 if (!fInitialized) {
90 make_bitmap();
91 make_checkerboard();
92 fInitialized = true;
93 }
94 canvas->clear(0x00000000);
95 SkPaint paint;
96
97 for (int i = 0; i < 4; i++) {
98 SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
99 SkIRect cropRect = SkIRect::MakeXYWH(i * 12,
100 i * 8,
101 bitmap->width() - i * 8,
102 bitmap->height() - i * 12);
103 SkImageFilter::CropRect rect(SkRect::Make(cropRect));
104 SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
105 SkScalar dx = SkIntToScalar(i*5);
106 SkScalar dy = SkIntToScalar(i*10);
107 SkAutoTUnref<SkImageFilter> filter(
108 SkOffsetImageFilter::Create(dx, dy, tileInput, &rect));
109 paint.setImageFilter(filter);
110 drawClippedBitmap(canvas, *bitmap, paint, SK_Scalar1, cropRect);
111 canvas->translate(SkIntToScalar(bitmap->width() + MARGIN), 0);
112 }
113
114 SkIRect cropRect = SkIRect::MakeXYWH(0, 0, 100, 100);
115 SkImageFilter::CropRect rect(SkRect::Make(cropRect));
116 SkAutoTUnref<SkImageFilter> filter(
117 SkOffsetImageFilter::Create(SkIntToScalar(-5), SkIntToScalar(-10), NULL, &rect));
118 paint.setImageFilter(filter);
119 drawClippedBitmap(canvas, fBitmap, paint, SkIntToScalar(2), cropRect);
120 }
121 private:
122 typedef GM INHERITED;
123 SkBitmap fBitmap, fCheckerboard;
124 bool fInitialized;
125 };
126
127 //////////////////////////////////////////////////////////////////////////////
128
MyFactory(void *)129 static GM* MyFactory(void*) { return new OffsetImageFilterGM; }
130 static GMRegistry reg(MyFactory);
131
132 }
133