1 /*
2 * Copyright 2011 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 "SampleCode.h"
9 #include "SkView.h"
10 #include "SkBlurMask.h"
11 #include "SkCanvas.h"
12 #include "SkCornerPathEffect.h"
13 #include "SkGradientShader.h"
14 #include "SkGraphics.h"
15 #include "SkImageDecoder.h"
16 #include "SkPath.h"
17 #include "SkRandom.h"
18 #include "SkRegion.h"
19 #include "SkShader.h"
20 #include "SkUtils.h"
21 #include "SkColorPriv.h"
22 #include "SkColorFilter.h"
23 #include "SkTime.h"
24 #include "SkTypeface.h"
25 #include "SkXfermode.h"
26
27 #include "SkStream.h"
28 #include "SkXMLParser.h"
29 #include "SkColorPriv.h"
30 #include "SkImageDecoder.h"
31 #include "SkBlurMaskFilter.h"
32
setNamedTypeface(SkPaint * paint,const char name[])33 static void setNamedTypeface(SkPaint* paint, const char name[]) {
34 SkTypeface* face = SkTypeface::CreateFromName(name, SkTypeface::kNormal);
35 paint->setTypeface(face);
36 SkSafeUnref(face);
37 }
38
39 static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
40
41 class XfermodesBlurView : public SampleView {
42 SkBitmap fBG;
43 SkBitmap fSrcB, fDstB;
44
draw_mode(SkCanvas * canvas,SkXfermode * mode,int alpha,SkScalar x,SkScalar y)45 void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha,
46 SkScalar x, SkScalar y) {
47 SkPaint p;
48 SkMaskFilter* mf = SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
49 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(5)),
50 SkBlurMaskFilter::kNone_BlurFlag);
51 p.setMaskFilter(mf)->unref();
52
53 SkScalar ww = SkIntToScalar(W);
54 SkScalar hh = SkIntToScalar(H);
55
56 // draw a circle covering the upper
57 // left three quarters of the canvas
58 p.setColor(0xFFCC44FF);
59 SkRect r;
60 r.set(0, 0, ww*3/4, hh*3/4);
61 r.offset(x, y);
62 canvas->drawOval(r, p);
63
64 p.setXfermode(mode);
65
66 // draw a square overlapping the circle
67 // in the lower right of the canvas
68 p.setColor(0x00AA6633 | alpha << 24);
69 r.set(ww/3, hh/3, ww*19/20, hh*19/20);
70 r.offset(x, y);
71 canvas->drawRect(r, p);
72 }
73
74 public:
75 const static int W = 64;
76 const static int H = 64;
XfermodesBlurView()77 XfermodesBlurView() {
78 fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType),
79 gBG, 4);
80 }
81
82 protected:
83 // overrides from SkEventSink
onQuery(SkEvent * evt)84 virtual bool onQuery(SkEvent* evt) {
85 if (SampleCode::TitleQ(*evt)) {
86 SampleCode::TitleR(evt, "XfermodesBlur");
87 return true;
88 }
89 return this->INHERITED::onQuery(evt);
90 }
91
onDrawContent(SkCanvas * canvas)92 virtual void onDrawContent(SkCanvas* canvas) {
93 canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
94
95 if (false) {
96 SkPaint paint;
97 paint.setAntiAlias(true);
98 paint.setTextSize(50);
99 paint.setTypeface(SkTypeface::CreateFromName("Arial Unicode MS", SkTypeface::kNormal));
100 SkSafeUnref(paint.getTypeface());
101 char buffer[10];
102 size_t len = SkUTF8_FromUnichar(0x8500, buffer);
103 canvas->drawText(buffer, len, 40, 40, paint);
104 return;
105 }
106 if (false) {
107 SkPaint paint;
108 paint.setAntiAlias(true);
109
110 SkRect r0 = { 0, 0, 10.5f, 20 };
111 SkRect r1 = { 10.5f, 10, 20, 30 };
112 paint.setColor(SK_ColorRED);
113 canvas->drawRect(r0, paint);
114 paint.setColor(SK_ColorBLUE);
115 canvas->drawRect(r1, paint);
116 return;
117 }
118
119 const struct {
120 SkXfermode::Mode fMode;
121 const char* fLabel;
122 } gModes[] = {
123 { SkXfermode::kClear_Mode, "Clear" },
124 { SkXfermode::kSrc_Mode, "Src" },
125 { SkXfermode::kDst_Mode, "Dst" },
126 { SkXfermode::kSrcOver_Mode, "SrcOver" },
127 { SkXfermode::kDstOver_Mode, "DstOver" },
128 { SkXfermode::kSrcIn_Mode, "SrcIn" },
129 { SkXfermode::kDstIn_Mode, "DstIn" },
130 { SkXfermode::kSrcOut_Mode, "SrcOut" },
131 { SkXfermode::kDstOut_Mode, "DstOut" },
132 { SkXfermode::kSrcATop_Mode, "SrcATop" },
133 { SkXfermode::kDstATop_Mode, "DstATop" },
134 { SkXfermode::kXor_Mode, "Xor" },
135
136 { SkXfermode::kPlus_Mode, "Plus" },
137 /*{ SkXfermode::kModulate_Mode, "Modulate" },
138 { SkXfermode::kScreen_Mode, "Screen" },
139 { SkXfermode::kOverlay_Mode, "Overlay" },
140 { SkXfermode::kDarken_Mode, "Darken" },
141 { SkXfermode::kLighten_Mode, "Lighten" },
142 { SkXfermode::kColorDodge_Mode, "ColorDodge" },
143 { SkXfermode::kColorBurn_Mode, "ColorBurn" },
144 { SkXfermode::kHardLight_Mode, "HardLight" },
145 { SkXfermode::kSoftLight_Mode, "SoftLight" },
146 { SkXfermode::kDifference_Mode, "Difference" },
147 { SkXfermode::kExclusion_Mode, "Exclusion" },*/
148 };
149
150 const SkScalar w = SkIntToScalar(W);
151 const SkScalar h = SkIntToScalar(H);
152 SkMatrix m;
153 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
154 SkShader* s = SkShader::CreateBitmapShader(fBG,
155 SkShader::kRepeat_TileMode,
156 SkShader::kRepeat_TileMode,
157 &m);
158
159 SkPaint labelP;
160 labelP.setAntiAlias(true);
161 labelP.setLCDRenderText(true);
162 labelP.setTextAlign(SkPaint::kCenter_Align);
163 setNamedTypeface(&labelP, "Menlo Regular");
164
165 const int W = 5;
166
167 SkScalar x0 = 0;
168 for (int twice = 0; twice < 2; twice++) {
169 SkScalar x = x0, y = 0;
170 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
171 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
172 SkAutoUnref aur(mode);
173 SkRect r;
174 r.set(x, y, x+w, y+h);
175
176 SkPaint p;
177 p.setStyle(SkPaint::kFill_Style);
178 p.setShader(s);
179 canvas->drawRect(r, p);
180
181 canvas->saveLayer(&r, nullptr);
182 draw_mode(canvas, mode, twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
183 canvas->restore();
184
185 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
186 p.setStyle(SkPaint::kStroke_Style);
187 p.setShader(nullptr);
188 canvas->drawRect(r, p);
189
190 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
191 x + w/2, y - labelP.getTextSize()/2, labelP);
192 x += w + SkIntToScalar(10);
193 if ((i % W) == W - 1) {
194 x = x0;
195 y += h + SkIntToScalar(30);
196 }
197 }
198 x0 += SkIntToScalar(400);
199 }
200 s->unref();
201 }
202
203 private:
204 typedef SampleView INHERITED;
205 };
206
207 //////////////////////////////////////////////////////////////////////////////
208
MyFactory()209 static SkView* MyFactory() { return new XfermodesBlurView; }
210 static SkViewRegister reg(MyFactory);
211