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 "include/core/SkBitmap.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColorFilter.h"
11 #include "include/core/SkColorPriv.h"
12 #include "include/core/SkFont.h"
13 #include "include/core/SkGraphics.h"
14 #include "include/core/SkPath.h"
15 #include "include/core/SkRegion.h"
16 #include "include/core/SkShader.h"
17 #include "include/core/SkTime.h"
18 #include "include/core/SkTypeface.h"
19 #include "include/effects/SkCornerPathEffect.h"
20 #include "include/effects/SkGradientShader.h"
21 #include "include/utils/SkRandom.h"
22 #include "include/utils/SkTextUtils.h"
23 #include "samplecode/Sample.h"
24 #include "src/core/SkBlurMask.h"
25 #include "src/utils/SkUTF.h"
26 
27 #include "include/core/SkColorPriv.h"
28 #include "include/core/SkMaskFilter.h"
29 #include "include/core/SkStream.h"
30 
setNamedTypeface(SkFont * font,const char name[])31 static void setNamedTypeface(SkFont* font, const char name[]) {
32     font->setTypeface(SkTypeface::MakeFromName(name, SkFontStyle()));
33 }
34 
35 static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
36 
37 class XfermodesBlurView : public Sample {
38     SkBitmap    fBG;
39     SkBitmap    fSrcB, fDstB;
40 
draw_mode(SkCanvas * canvas,SkBlendMode mode,int alpha,SkScalar x,SkScalar y)41     void draw_mode(SkCanvas* canvas, SkBlendMode mode, int alpha, SkScalar x, SkScalar y) {
42         SkPaint p;
43         p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
44                                                SkBlurMask::ConvertRadiusToSigma(5)));
45 
46         SkScalar ww = SkIntToScalar(W);
47         SkScalar hh = SkIntToScalar(H);
48 
49         // draw a circle covering the upper
50         // left three quarters of the canvas
51         p.setColor(0xFFCC44FF);
52         SkRect r;
53         r.setLTRB(0, 0, ww*3/4, hh*3/4);
54         r.offset(x, y);
55         canvas->drawOval(r, p);
56 
57         p.setBlendMode(mode);
58 
59         // draw a square overlapping the circle
60         // in the lower right of the canvas
61         p.setColor(0x00AA6633 | alpha << 24);
62         r.setLTRB(ww/3, hh/3, ww*19/20, hh*19/20);
63         r.offset(x, y);
64         canvas->drawRect(r, p);
65     }
66 
67 public:
68     const static int W = 64;
69     const static int H = 64;
XfermodesBlurView()70     XfermodesBlurView() {
71         fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType),
72                           gBG, 4);
73     }
74 
75 protected:
name()76     virtual SkString name() { return SkString("XfermodesBlur"); }
77 
onDrawContent(SkCanvas * canvas)78     virtual void onDrawContent(SkCanvas* canvas) {
79         canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
80 
81         const SkBlendMode gModes[] = {
82             SkBlendMode::kClear,
83             SkBlendMode::kSrc,
84             SkBlendMode::kDst,
85             SkBlendMode::kSrcOver,
86             SkBlendMode::kDstOver,
87             SkBlendMode::kSrcIn,
88             SkBlendMode::kDstIn,
89             SkBlendMode::kSrcOut,
90             SkBlendMode::kDstOut,
91             SkBlendMode::kSrcATop,
92             SkBlendMode::kDstATop,
93             SkBlendMode::kXor,
94             SkBlendMode::kPlus,
95         };
96 
97         const SkScalar w = SkIntToScalar(W);
98         const SkScalar h = SkIntToScalar(H);
99         SkMatrix m;
100         m.setScale(SkIntToScalar(6), SkIntToScalar(6));
101         auto s = fBG.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &m);
102 
103         SkFont font;
104         font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
105         setNamedTypeface(&font, "Menlo Regular");
106 
107         const int W = 5;
108 
109         SkScalar x0 = 0;
110         for (int twice = 0; twice < 2; twice++) {
111             SkScalar x = x0, y = 0;
112             for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
113                 SkRect r;
114                 r.setLTRB(x, y, x+w, y+h);
115 
116                 SkPaint p;
117                 p.setStyle(SkPaint::kFill_Style);
118                 p.setShader(s);
119                 canvas->drawRect(r, p);
120 
121                 canvas->saveLayer(&r, nullptr);
122                 draw_mode(canvas, gModes[i], twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
123                 canvas->restore();
124 
125                 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
126                 p.setStyle(SkPaint::kStroke_Style);
127                 p.setShader(nullptr);
128                 canvas->drawRect(r, p);
129 
130                 const char* label = SkBlendMode_Name(gModes[i]);
131                 SkTextUtils::DrawString(canvas, label, x + w/2, y - font.getSize()/2, font, SkPaint(),
132                                         SkTextUtils::kCenter_Align);
133                 x += w + SkIntToScalar(10);
134                 if ((i % W) == W - 1) {
135                     x = x0;
136                     y += h + SkIntToScalar(30);
137                 }
138             }
139             x0 += SkIntToScalar(400);
140         }
141     }
142 
143 private:
144     typedef Sample INHERITED;
145 };
146 
147 //////////////////////////////////////////////////////////////////////////////
148 
149 DEF_SAMPLE( return new XfermodesBlurView(); )
150