1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SkAAClip.h"
9 #include "SampleCode.h"
10 #include "SkView.h"
11 #include "SkCanvas.h"
12 #include "SkGradientShader.h"
13 #include "SkPath.h"
14 #include "SkRegion.h"
15 #include "SkShader.h"
16 #include "SkUtils.h"
17 #include "SkImageDecoder.h"
18
19 #ifdef SK_BUILD_FOR_WIN
20 // windows doesn't have roundf
roundf(float x)21 inline float roundf(float x) { return (x-floor(x))>0.5 ? ceil(x) : floor(x); }
22 #endif
23
drawClip(SkCanvas * canvas,const SkAAClip & clip)24 static void drawClip(SkCanvas* canvas, const SkAAClip& clip) {
25 SkMask mask;
26 SkBitmap bm;
27
28 clip.copyToMask(&mask);
29 SkAutoMaskFreeImage amfi(mask.fImage);
30
31 bm.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(),
32 mask.fBounds.height(), mask.fRowBytes);
33 bm.setPixels(mask.fImage);
34
35 SkPaint paint;
36 canvas->drawBitmap(bm,
37 SK_Scalar1 * mask.fBounds.fLeft,
38 SK_Scalar1 * mask.fBounds.fTop,
39 &paint);
40 }
41
paint_rgn(SkCanvas * canvas,const SkAAClip & clip,const SkPaint & paint)42 static void paint_rgn(SkCanvas* canvas, const SkAAClip& clip,
43 const SkPaint& paint) {
44 SkMask mask;
45 SkBitmap bm;
46
47 clip.copyToMask(&mask);
48 SkAutoMaskFreeImage amfi(mask.fImage);
49
50 bm.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(),
51 mask.fBounds.height(), mask.fRowBytes);
52 bm.setPixels(mask.fImage);
53
54 canvas->drawBitmap(bm,
55 SK_Scalar1 * mask.fBounds.fLeft,
56 SK_Scalar1 * mask.fBounds.fTop,
57 &paint);
58 }
59
60 class AAClipView2 : public SampleView {
61 public:
AAClipView2()62 AAClipView2() {
63 fBase.set(100, 100, 150, 150);
64 fRect = fBase;
65 fRect.inset(5, 5);
66 fRect.offset(25, 25);
67 this->setBGColor(0xFFDDDDDD);
68 }
69
setAAClip(SkAAClip * clip,const SkIRect & rect)70 static void setAAClip(SkAAClip* clip, const SkIRect& rect) {
71 SkRect r;
72 r.set(rect);
73 SkPath path;
74 path.addRoundRect(r, SkIntToScalar(5), SkIntToScalar(5));
75 clip->setPath(path);
76 }
77
build_rgn(SkAAClip * clip,SkRegion::Op op)78 void build_rgn(SkAAClip* clip, SkRegion::Op op) {
79 setAAClip(clip, fBase);
80
81 SkAAClip clip2;
82 setAAClip(&clip2, fRect);
83 clip->op(clip2, op);
84 }
85
86
87 protected:
88 // overrides from SkEventSink
onQuery(SkEvent * evt)89 virtual bool onQuery(SkEvent* evt) {
90 if (SampleCode::TitleQ(*evt)) {
91 SampleCode::TitleR(evt, "AAClips");
92 return true;
93 }
94 return this->INHERITED::onQuery(evt);
95 }
96
drawOrig(SkCanvas * canvas,bool bg)97 void drawOrig(SkCanvas* canvas, bool bg) {
98 SkRect r;
99 SkPaint paint;
100
101 paint.setStyle(SkPaint::kStroke_Style);
102 if (bg)
103 paint.setColor(0xFFBBBBBB);
104
105 r.set(fBase);
106 canvas->drawRect(r, paint);
107 r.set(fRect);
108 canvas->drawRect(r, paint);
109 }
110
outer_frame(SkCanvas * canvas,const SkIRect & rect)111 static void outer_frame(SkCanvas* canvas, const SkIRect& rect) {
112 SkRect r;
113 r.set(rect);
114 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
115
116 SkPaint paint;
117 paint.setColor(SK_ColorGRAY);
118 paint.setStyle(SkPaint::kStroke_Style);
119 canvas->drawRect(r, paint);
120 }
121
drawRgnOped(SkCanvas * canvas,SkRegion::Op op,SkColor color)122 void drawRgnOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
123 SkAAClip clip;
124
125 this->build_rgn(&clip, op);
126
127 this->drawOrig(canvas, true);
128
129 SkPaint paint;
130 paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
131 paint_rgn(canvas, clip, paint);
132
133 paint.setStyle(SkPaint::kStroke_Style);
134 paint.setColor(color);
135 paint_rgn(canvas, clip, paint);
136
137 SkAAClip clip2(clip);
138 clip2.translate(0, 80);
139 outer_frame(canvas, clip2.getBounds());
140 paint_rgn(canvas, clip2, paint);
141 }
142
onDrawContent(SkCanvas * canvas)143 virtual void onDrawContent(SkCanvas* canvas) {
144
145 static const struct {
146 SkColor fColor;
147 const char* fName;
148 SkRegion::Op fOp;
149 } gOps[] = {
150 { SK_ColorBLACK, "Difference", SkRegion::kDifference_Op },
151 { SK_ColorRED, "Intersect", SkRegion::kIntersect_Op },
152 { 0xFF008800, "Union", SkRegion::kUnion_Op },
153 { SK_ColorBLUE, "XOR", SkRegion::kXOR_Op }
154 };
155
156 SkPaint textPaint;
157 textPaint.setAntiAlias(true);
158 textPaint.setTextSize(SK_Scalar1*24);
159
160 this->drawOrig(canvas, false);
161
162 canvas->translate(0, SkIntToScalar(200));
163
164 for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); op++) {
165 canvas->drawText(gOps[op].fName, strlen(gOps[op].fName), SkIntToScalar(75), SkIntToScalar(50), textPaint);
166
167 this->drawRgnOped(canvas, gOps[op].fOp, gOps[op].fColor);
168
169 canvas->translate(SkIntToScalar(200), 0);
170 }
171 }
172
onFindClickHandler(SkScalar x,SkScalar y)173 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
174 return fRect.contains(SkScalarRound(x), SkScalarRound(y)) ? new Click(this) : NULL;
175 }
176
onClick(Click * click)177 virtual bool onClick(Click* click) {
178 fRect.offset(click->fICurr.fX - click->fIPrev.fX,
179 click->fICurr.fY - click->fIPrev.fY);
180 this->inval(NULL);
181 return true;
182 }
183
184 private:
185 SkIRect fBase, fRect;
186
187 typedef SampleView INHERITED;
188 };
189
190 //////////////////////////////////////////////////////////////////////////////
191
MyFactory()192 static SkView* MyFactory() { return new AAClipView2; }
193 static SkViewRegister reg(MyFactory);
194
195