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
33 static SkRandom gRand;
34
test_chromium_9005()35 static void test_chromium_9005() {
36 SkBitmap bm;
37 bm.setConfig(SkBitmap::kARGB_8888_Config, 800, 600);
38 bm.allocPixels();
39
40 SkCanvas canvas(bm);
41
42 SkPoint pt0 = { SkFloatToScalar(799.33374f), SkFloatToScalar(1.2360189f) };
43 SkPoint pt1 = { SkFloatToScalar(808.49969f), SkFloatToScalar(-7.4338055f) };
44
45 SkPaint paint;
46 paint.setAntiAlias(true);
47 canvas.drawLine(pt0.fX, pt0.fY, pt1.fX, pt1.fY, paint);
48 }
49
generate_pts(SkPoint pts[],int count,int w,int h)50 static void generate_pts(SkPoint pts[], int count, int w, int h) {
51 for (int i = 0; i < count; i++) {
52 pts[i].set(gRand.nextUScalar1() * 3 * w - SkIntToScalar(w),
53 gRand.nextUScalar1() * 3 * h - SkIntToScalar(h));
54 }
55 }
56
check_zeros(const SkPMColor pixels[],int count,int skip)57 static bool check_zeros(const SkPMColor pixels[], int count, int skip) {
58 for (int i = 0; i < count; i++) {
59 if (*pixels) {
60 return false;
61 }
62 pixels += skip;
63 }
64 return true;
65 }
66
check_bitmap_margin(const SkBitmap & bm,int margin)67 static bool check_bitmap_margin(const SkBitmap& bm, int margin) {
68 size_t rb = bm.rowBytes();
69 for (int i = 0; i < margin; i++) {
70 if (!check_zeros(bm.getAddr32(0, i), bm.width(), 1)) {
71 return false;
72 }
73 int bottom = bm.height() - i - 1;
74 if (!check_zeros(bm.getAddr32(0, bottom), bm.width(), 1)) {
75 return false;
76 }
77 // left column
78 if (!check_zeros(bm.getAddr32(i, 0), bm.height(), rb >> 2)) {
79 return false;
80 }
81 int right = bm.width() - margin + i;
82 if (!check_zeros(bm.getAddr32(right, 0), bm.height(), rb >> 2)) {
83 return false;
84 }
85 }
86 return true;
87 }
88
89 #define WIDTH 620
90 #define HEIGHT 460
91 #define MARGIN 10
92
line_proc(SkCanvas * canvas,const SkPaint & paint,const SkBitmap & bm)93 static void line_proc(SkCanvas* canvas, const SkPaint& paint,
94 const SkBitmap& bm) {
95 const int N = 2;
96 SkPoint pts[N];
97 for (int i = 0; i < 400; i++) {
98 generate_pts(pts, N, WIDTH, HEIGHT);
99
100 canvas->drawLine(pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY, paint);
101 if (!check_bitmap_margin(bm, MARGIN)) {
102 SkDebugf("---- hairline failure (%g %g) (%g %g)\n",
103 pts[0].fX, pts[0].fY, pts[1].fX, pts[1].fY);
104 break;
105 }
106 }
107 }
108
poly_proc(SkCanvas * canvas,const SkPaint & paint,const SkBitmap & bm)109 static void poly_proc(SkCanvas* canvas, const SkPaint& paint,
110 const SkBitmap& bm) {
111 const int N = 8;
112 SkPoint pts[N];
113 for (int i = 0; i < 50; i++) {
114 generate_pts(pts, N, WIDTH, HEIGHT);
115
116 SkPath path;
117 path.moveTo(pts[0]);
118 for (int j = 1; j < N; j++) {
119 path.lineTo(pts[j]);
120 }
121 canvas->drawPath(path, paint);
122 }
123 }
124
ave(const SkPoint & a,const SkPoint & b)125 static SkPoint ave(const SkPoint& a, const SkPoint& b) {
126 SkPoint c = a + b;
127 c.fX = SkScalarHalf(c.fX);
128 c.fY = SkScalarHalf(c.fY);
129 return c;
130 }
131
quad_proc(SkCanvas * canvas,const SkPaint & paint,const SkBitmap & bm)132 static void quad_proc(SkCanvas* canvas, const SkPaint& paint,
133 const SkBitmap& bm) {
134 const int N = 30;
135 SkPoint pts[N];
136 for (int i = 0; i < 10; i++) {
137 generate_pts(pts, N, WIDTH, HEIGHT);
138
139 SkPath path;
140 path.moveTo(pts[0]);
141 for (int j = 1; j < N - 2; j++) {
142 path.quadTo(pts[j], ave(pts[j], pts[j+1]));
143 }
144 path.quadTo(pts[N - 2], pts[N - 1]);
145
146 canvas->drawPath(path, paint);
147 }
148 }
149
add_cubic(SkPath * path,const SkPoint & mid,const SkPoint & end)150 static void add_cubic(SkPath* path, const SkPoint& mid, const SkPoint& end) {
151 SkPoint start;
152 path->getLastPt(&start);
153 path->cubicTo(ave(start, mid), ave(mid, end), end);
154 }
155
cube_proc(SkCanvas * canvas,const SkPaint & paint,const SkBitmap & bm)156 static void cube_proc(SkCanvas* canvas, const SkPaint& paint,
157 const SkBitmap& bm) {
158 const int N = 30;
159 SkPoint pts[N];
160 for (int i = 0; i < 10; i++) {
161 generate_pts(pts, N, WIDTH, HEIGHT);
162
163 SkPath path;
164 path.moveTo(pts[0]);
165 for (int j = 1; j < N - 2; j++) {
166 add_cubic(&path, pts[j], ave(pts[j], pts[j+1]));
167 }
168 add_cubic(&path, pts[N - 2], pts[N - 1]);
169
170 canvas->drawPath(path, paint);
171 }
172 }
173
174 typedef void (*HairProc)(SkCanvas*, const SkPaint&, const SkBitmap&);
175
176 static const struct {
177 const char* fName;
178 HairProc fProc;
179 } gProcs[] = {
180 { "line", line_proc },
181 { "poly", poly_proc },
182 { "quad", quad_proc },
183 { "cube", cube_proc },
184 };
185
cycle_hairproc_index(int index)186 static int cycle_hairproc_index(int index) {
187 return (index + 1) % SK_ARRAY_COUNT(gProcs);
188 }
189
190 class HairlineView : public SampleView {
191 SkMSec fNow;
192 int fProcIndex;
193 bool fDoAA;
194 public:
HairlineView()195 HairlineView() {
196 fCounter = 0;
197 fProcIndex = 0;
198 fDoAA = true;
199 fNow = 0;
200 }
201
202 protected:
203 // overrides from SkEventSink
onQuery(SkEvent * evt)204 virtual bool onQuery(SkEvent* evt) {
205 if (SampleCode::TitleQ(*evt)) {
206 SkString str;
207 str.printf("Hair-%s", gProcs[fProcIndex].fName);
208 SampleCode::TitleR(evt, str.c_str());
209 return true;
210 }
211 return this->INHERITED::onQuery(evt);
212 }
213
show_bitmaps(SkCanvas * canvas,const SkBitmap & b0,const SkBitmap & b1,const SkIRect & inset)214 void show_bitmaps(SkCanvas* canvas, const SkBitmap& b0, const SkBitmap& b1,
215 const SkIRect& inset) {
216 canvas->drawBitmap(b0, 0, 0, NULL);
217 canvas->drawBitmap(b1, SkIntToScalar(b0.width()), 0, NULL);
218 }
219
220 int fCounter;
221
onDrawContent(SkCanvas * canvas)222 virtual void onDrawContent(SkCanvas* canvas) {
223 gRand.setSeed(fNow);
224
225 if (false) {
226 test_chromium_9005();
227 }
228
229 SkBitmap bm, bm2;
230 bm.setConfig(SkBitmap::kARGB_8888_Config,
231 WIDTH + MARGIN*2,
232 HEIGHT + MARGIN*2);
233 bm.allocPixels();
234 // this will erase our margin, which we want to always stay 0
235 bm.eraseColor(0);
236
237 bm2.setConfig(SkBitmap::kARGB_8888_Config, WIDTH, HEIGHT,
238 bm.rowBytes());
239 bm2.setPixels(bm.getAddr32(MARGIN, MARGIN));
240
241 SkCanvas c2(bm2);
242 SkPaint paint;
243 paint.setAntiAlias(fDoAA);
244 paint.setStyle(SkPaint::kStroke_Style);
245
246 bm2.eraseColor(0);
247 gProcs[fProcIndex].fProc(&c2, paint, bm);
248 canvas->drawBitmap(bm2, SkIntToScalar(10), SkIntToScalar(10), NULL);
249
250 SkMSec now = SampleCode::GetAnimTime();
251 if (fNow != now) {
252 fNow = now;
253 fCounter += 1;
254 fDoAA = !fDoAA;
255 if (fCounter > 50) {
256 fProcIndex = cycle_hairproc_index(fProcIndex);
257 // todo: signal that we want to rebuild our TITLE
258 fCounter = 0;
259 }
260 this->inval(NULL);
261 }
262 }
263
onFindClickHandler(SkScalar x,SkScalar y)264 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
265 fDoAA = !fDoAA;
266 this->inval(NULL);
267 return this->INHERITED::onFindClickHandler(x, y);
268 }
269
270
271 private:
272 typedef SampleView INHERITED;
273 };
274
275 //////////////////////////////////////////////////////////////////////////////
276
MyFactory()277 static SkView* MyFactory() { return new HairlineView; }
278 static SkViewRegister reg(MyFactory);
279
280