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 "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "Sk64.h"
12 #include "SkCornerPathEffect.h"
13 #include "SkGradientShader.h"
14 #include "SkGraphics.h"
15 #include "SkImageDecoder.h"
16 #include "SkKernel33MaskFilter.h"
17 #include "SkPath.h"
18 #include "SkRandom.h"
19 #include "SkRegion.h"
20 #include "SkShader.h"
21 #include "SkUtils.h"
22 #include "SkColorPriv.h"
23 #include "SkColorFilter.h"
24 #include "SkTime.h"
25 #include "SkTypeface.h"
26 #include "SkXfermode.h"
27
28 #include "SkStream.h"
29 #include "SkXMLParser.h"
30 #include "SkColorPriv.h"
31 #include "SkImageDecoder.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 #if 0
40 static int newscale(U8CPU a, U8CPU b, int shift) {
41 unsigned prod = a * b + (1 << (shift - 1));
42 return (prod + (prod >> shift)) >> shift;
43 }
44
45 static void test_srcover565(SkCanvas* canvas) {
46 const int width = 32;
47 SkBitmap bm1, bm2, bm3;
48 bm1.setConfig(SkBitmap::kRGB_565_Config, width, 256); bm1.allocPixels(NULL);
49 bm2.setConfig(SkBitmap::kRGB_565_Config, width, 256); bm2.allocPixels(NULL);
50 bm3.setConfig(SkBitmap::kRGB_565_Config, width, 256); bm3.allocPixels(NULL);
51
52 int rgb = 0x18;
53 int r = rgb >> 3;
54 int g = rgb >> 2;
55 uint16_t dst = SkPackRGB16(r, g, r);
56 for (int alpha = 0; alpha <= 255; alpha++) {
57 SkPMColor pm = SkPreMultiplyARGB(alpha, rgb, rgb, rgb);
58 uint16_t newdst = SkSrcOver32To16(pm, dst);
59 sk_memset16(bm1.getAddr16(0, alpha), newdst, bm1.width());
60
61 int ia = 255 - alpha;
62 int iscale = SkAlpha255To256(ia);
63 int dr = (SkGetPackedR32(pm) + (r * iscale >> 5)) >> 3;
64 int dg = (SkGetPackedG32(pm) + (g * iscale >> 6)) >> 2;
65
66 sk_memset16(bm2.getAddr16(0, alpha), SkPackRGB16(dr, dg, dr), bm2.width());
67
68 int dr2 = (SkMulDiv255Round(alpha, rgb) + newscale(r, ia, 5)) >> 3;
69 int dg2 = (SkMulDiv255Round(alpha, rgb) + newscale(g, ia, 6)) >> 2;
70
71 sk_memset16(bm3.getAddr16(0, alpha), SkPackRGB16(dr2, dg2, dr2), bm3.width());
72
73 // if (mr != dr || mg != dg)
74 {
75 // SkDebugf("[%d] macro [%d %d] inline [%d %d] new [%d %d]\n", alpha, mr, mg, dr, dg, dr2, dg2);
76 }
77 }
78
79 SkScalar dx = SkIntToScalar(width+4);
80
81 canvas->drawBitmap(bm1, 0, 0, NULL); canvas->translate(dx, 0);
82 canvas->drawBitmap(bm2, 0, 0, NULL); canvas->translate(dx, 0);
83 canvas->drawBitmap(bm3, 0, 0, NULL); canvas->translate(dx, 0);
84
85 SkRect rect = { 0, 0, SkIntToScalar(bm1.width()), SkIntToScalar(bm1.height()) };
86 SkPaint p;
87 p.setARGB(0xFF, rgb, rgb, rgb);
88 canvas->drawRect(rect, p);
89 }
90 #endif
91
make_bitmaps(int w,int h,SkBitmap * src,SkBitmap * dst)92 static void make_bitmaps(int w, int h, SkBitmap* src, SkBitmap* dst) {
93 src->setConfig(SkBitmap::kARGB_8888_Config, w, h);
94 src->allocPixels();
95 src->eraseColor(0);
96
97 SkCanvas c(*src);
98 SkPaint p;
99 SkRect r;
100 SkScalar ww = SkIntToScalar(w);
101 SkScalar hh = SkIntToScalar(h);
102
103 p.setAntiAlias(true);
104 p.setColor(0xFFFFCC44);
105 r.set(0, 0, ww*3/4, hh*3/4);
106 c.drawOval(r, p);
107
108 dst->setConfig(SkBitmap::kARGB_8888_Config, w, h);
109 dst->allocPixels();
110 dst->eraseColor(0);
111 c.setBitmapDevice(*dst);
112
113 p.setColor(0xFF66AAFF);
114 r.set(ww/3, hh/3, ww*19/20, hh*19/20);
115 c.drawRect(r, p);
116 }
117
118 static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
119
120 class XfermodesView : public SampleView {
121 SkBitmap fBG;
122 SkBitmap fSrcB, fDstB;
123
draw_mode(SkCanvas * canvas,SkXfermode * mode,int alpha,SkScalar x,SkScalar y)124 void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha,
125 SkScalar x, SkScalar y) {
126 SkPaint p;
127
128 canvas->drawBitmap(fSrcB, x, y, &p);
129 p.setAlpha(alpha);
130 p.setXfermode(mode);
131 canvas->drawBitmap(fDstB, x, y, &p);
132 }
133
134 public:
135 const static int W = 64;
136 const static int H = 64;
XfermodesView()137 XfermodesView() {
138 const int W = 64;
139 const int H = 64;
140
141 fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
142 fBG.setPixels(gBG);
143 fBG.setIsOpaque(true);
144
145 make_bitmaps(W, H, &fSrcB, &fDstB);
146 }
147
148 protected:
149 // overrides from SkEventSink
onQuery(SkEvent * evt)150 virtual bool onQuery(SkEvent* evt) {
151 if (SampleCode::TitleQ(*evt)) {
152 SampleCode::TitleR(evt, "Xfermodes");
153 return true;
154 }
155 return this->INHERITED::onQuery(evt);
156 }
157
onDrawContent(SkCanvas * canvas)158 virtual void onDrawContent(SkCanvas* canvas) {
159 canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
160
161 const struct {
162 SkXfermode::Mode fMode;
163 const char* fLabel;
164 } gModes[] = {
165 { SkXfermode::kClear_Mode, "Clear" },
166 { SkXfermode::kSrc_Mode, "Src" },
167 { SkXfermode::kDst_Mode, "Dst" },
168 { SkXfermode::kSrcOver_Mode, "SrcOver" },
169 { SkXfermode::kDstOver_Mode, "DstOver" },
170 { SkXfermode::kSrcIn_Mode, "SrcIn" },
171 { SkXfermode::kDstIn_Mode, "DstIn" },
172 { SkXfermode::kSrcOut_Mode, "SrcOut" },
173 { SkXfermode::kDstOut_Mode, "DstOut" },
174 { SkXfermode::kSrcATop_Mode, "SrcATop" },
175 { SkXfermode::kDstATop_Mode, "DstATop" },
176 { SkXfermode::kXor_Mode, "Xor" },
177
178 { SkXfermode::kPlus_Mode, "Plus" },
179 { SkXfermode::kMultiply_Mode, "Multiply" },
180 { SkXfermode::kScreen_Mode, "Screen" },
181 { SkXfermode::kOverlay_Mode, "Overlay" },
182 { SkXfermode::kDarken_Mode, "Darken" },
183 { SkXfermode::kLighten_Mode, "Lighten" },
184 { SkXfermode::kColorDodge_Mode, "ColorDodge" },
185 { SkXfermode::kColorBurn_Mode, "ColorBurn" },
186 { SkXfermode::kHardLight_Mode, "HardLight" },
187 { SkXfermode::kSoftLight_Mode, "SoftLight" },
188 { SkXfermode::kDifference_Mode, "Difference" },
189 { SkXfermode::kExclusion_Mode, "Exclusion" },
190 };
191
192 const SkScalar w = SkIntToScalar(W);
193 const SkScalar h = SkIntToScalar(H);
194 SkShader* s = SkShader::CreateBitmapShader(fBG,
195 SkShader::kRepeat_TileMode,
196 SkShader::kRepeat_TileMode);
197 SkMatrix m;
198 m.setScale(SkIntToScalar(6), SkIntToScalar(6));
199 s->setLocalMatrix(m);
200
201 SkPaint labelP;
202 labelP.setAntiAlias(true);
203 labelP.setLCDRenderText(true);
204 labelP.setTextAlign(SkPaint::kCenter_Align);
205 setNamedTypeface(&labelP, "Menlo Regular");
206 // labelP.setTextSize(SkIntToScalar(11));
207
208 const int W = 5;
209
210 SkScalar x0 = 0;
211 for (int twice = 0; twice < 2; twice++) {
212 SkScalar x = x0, y = 0;
213 for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
214 SkXfermode* mode = SkXfermode::Create(gModes[i].fMode);
215 SkAutoUnref aur(mode);
216 SkRect r;
217 r.set(x, y, x+w, y+h);
218
219 SkPaint p;
220 p.setStyle(SkPaint::kFill_Style);
221 p.setShader(s);
222 canvas->drawRect(r, p);
223
224 canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
225 // canvas->save();
226 draw_mode(canvas, mode, twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
227 canvas->restore();
228
229 r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
230 p.setStyle(SkPaint::kStroke_Style);
231 p.setShader(NULL);
232 canvas->drawRect(r, p);
233
234 #if 1
235 canvas->drawText(gModes[i].fLabel, strlen(gModes[i].fLabel),
236 x + w/2, y - labelP.getTextSize()/2, labelP);
237 #endif
238 x += w + SkIntToScalar(10);
239 if ((i % W) == W - 1) {
240 x = x0;
241 y += h + SkIntToScalar(30);
242 }
243 }
244 x0 += SkIntToScalar(400);
245 }
246 s->unref();
247 }
248
249 private:
250 typedef SampleView INHERITED;
251 };
252
253 //////////////////////////////////////////////////////////////////////////////
254
MyFactory()255 static SkView* MyFactory() { return new XfermodesView; }
256 static SkViewRegister reg(MyFactory);
257
258