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 "gm.h"
9 #include "Resources.h"
10 #include "SkPath.h"
11 #include "SkTypeface.h"
12
13 class SkJSCanvas {
14 public:
15 SkJSCanvas(SkCanvas* target);
16 ~SkJSCanvas();
17
18 void save();
19 void restore();
20
21 double lineWidth;
22 void setLineWidth(double);
23
24 void beginPath();
25 void moveTo(double x, double y);
26 void lineTo(double x, double y);
27 void closePath();
28
29 void fill();
30 void stroke();
31
32 void fillText(const char text[], double x, double y);
33
34 private:
35 SkCanvas* fTarget;
36 SkPaint fFillPaint;
37 SkPaint fStrokePaint;
38 SkPath fPath;
39 };
40
SkJSCanvas(SkCanvas * target)41 SkJSCanvas::SkJSCanvas(SkCanvas* target) : fTarget(target) {
42 fFillPaint.setAntiAlias(true);
43 sk_tool_utils::set_portable_typeface(&fFillPaint);
44 fStrokePaint.setAntiAlias(true);
45 fStrokePaint.setStyle(SkPaint::kStroke_Style);
46 fStrokePaint.setStrokeWidth(SK_Scalar1);
47 }
48
~SkJSCanvas()49 SkJSCanvas::~SkJSCanvas() {}
50
save()51 void SkJSCanvas::save() { fTarget->save(); }
restore()52 void SkJSCanvas::restore() { fTarget->restore(); }
53
beginPath()54 void SkJSCanvas::beginPath() { fPath.reset(); }
moveTo(double x,double y)55 void SkJSCanvas::moveTo(double x, double y) {
56 fPath.moveTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
57 }
58
lineTo(double x,double y)59 void SkJSCanvas::lineTo(double x, double y) {
60 fPath.lineTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
61 }
62
closePath()63 void SkJSCanvas::closePath() { fPath.close(); }
64
fill()65 void SkJSCanvas::fill() {
66 fTarget->drawPath(fPath, fFillPaint);
67 }
68
stroke()69 void SkJSCanvas::stroke() {
70 fStrokePaint.setStrokeWidth(SkDoubleToScalar(lineWidth));
71 fTarget->drawPath(fPath, fStrokePaint);
72 }
73
fillText(const char text[],double x,double y)74 void SkJSCanvas::fillText(const char text[], double x, double y) {
75 fTarget->drawText(text, strlen(text),
76 SkDoubleToScalar(x), SkDoubleToScalar(y), fFillPaint);
77 }
78
79 ///////////////////////////////////////////////////////////////////////////////
80
dump(const SkPath & path)81 static void dump(const SkPath& path) {
82 const SkRect& r = path.getBounds();
83 SkDebugf("isEmpty %d, bounds [%g %g %g %g]\n", path.isEmpty(),
84 r.fLeft, r.fTop, r.fRight, r.fBottom);
85 }
86
test_stroke(SkCanvas * canvas)87 static void test_stroke(SkCanvas* canvas) {
88 if (true) {
89 SkPath path;
90 dump(path);
91 path.reset(); path.moveTo(0, 0);
92 dump(path);
93 path.reset(); path.moveTo(100, 100);
94 dump(path);
95 path.reset(); path.moveTo(0, 0); path.moveTo(100, 100);
96 dump(path);
97 path.reset(); path.moveTo(0, 0); path.lineTo(100, 100);
98 dump(path);
99 path.reset(); path.moveTo(0, 0); path.lineTo(100, 100); path.moveTo(200, 200);
100 dump(path);
101 }
102
103 #if 0
104 // TEST 1 - The rectangle as it's expected to look
105 var canvas = document.createElement('canvas');
106 document.body.appendChild(canvas);
107 var ctx = canvas.getContext("2d");
108 #else
109 SkJSCanvas ctx(canvas);
110 #endif
111
112 ctx.save();
113 ctx.lineWidth = 2;
114 ctx.beginPath();
115 ctx.moveTo(10, 100);
116 ctx.lineTo(150, 100);
117 ctx.lineTo(150, 15);
118 ctx.lineTo(10, 15);
119 ctx.closePath();
120
121 // no extra moveTo here
122 // ctx.moveTo(175, 125);
123
124 ctx.stroke();
125 ctx.restore();
126
127 ctx.fillText("As Expected", 10, 10);
128
129 #if 0
130 // TEST 2 - Includes an extra moveTo call before stroke; the rectangle appears larger
131 canvas = document.createElement('canvas');
132 document.body.appendChild(canvas);
133 ctx = canvas.getContext("2d");
134 #else
135 canvas->translate(200, 0);
136 #endif
137
138 ctx.save();
139 ctx.lineWidth = 2;
140 ctx.beginPath();
141 ctx.moveTo(10, 100);
142 ctx.lineTo(150, 100);
143 ctx.lineTo(150, 15);
144 ctx.lineTo(10, 15);
145 ctx.closePath();
146
147 ctx.moveTo(175, 125);
148
149 ctx.stroke();
150 ctx.restore();
151
152 ctx.fillText("Larger Rectangle", 10, 10);
153
154 #if 0
155 // TEST 3 - Identical to test 2 except the line width is 1
156 canvas = document.createElement('canvas');
157 document.body.appendChild(canvas);
158 ctx = canvas.getContext("2d");
159 #else
160 canvas->translate(200, 0);
161 #endif
162
163 ctx.save();
164 ctx.lineWidth = 1;
165 ctx.beginPath();
166 ctx.moveTo(10, 100);
167 ctx.lineTo(150, 100);
168 ctx.lineTo(150, 15);
169 ctx.lineTo(10, 15);
170 ctx.closePath();
171
172 ctx.moveTo(175, 125);
173
174 ctx.stroke();
175 ctx.restore();
176
177 ctx.fillText("As Expected - line width 1", 10, 10);
178 }
179
180 class Poly2PolyGM : public skiagm::GM {
181 public:
Poly2PolyGM()182 Poly2PolyGM() {}
183
184 protected:
185
onShortName()186 SkString onShortName() override {
187 return SkString("poly2poly");
188 }
189
onISize()190 SkISize onISize() override {
191 return SkISize::Make(835, 840);
192 }
193
doDraw(SkCanvas * canvas,SkPaint * paint,const int isrc[],const int idst[],int count)194 static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
195 const int idst[], int count) {
196 SkMatrix matrix;
197 SkPoint src[4], dst[4];
198
199 for (int i = 0; i < count; i++) {
200 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
201 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
202 }
203
204 canvas->save();
205 matrix.setPolyToPoly(src, dst, count);
206 canvas->concat(matrix);
207
208 paint->setColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
209 paint->setStyle(SkPaint::kStroke_Style);
210 const SkScalar D = SkIntToScalar(64);
211 canvas->drawRectCoords(0, 0, D, D, *paint);
212 canvas->drawLine(0, 0, D, D, *paint);
213 canvas->drawLine(0, D, D, 0, *paint);
214
215 SkPaint::FontMetrics fm;
216 paint->getFontMetrics(&fm);
217 paint->setColor(SK_ColorRED);
218 paint->setStyle(SkPaint::kFill_Style);
219 SkScalar x = D/2;
220 SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2;
221 uint16_t glyphID = 3; // X
222 canvas->drawText((void*) &glyphID, sizeof(glyphID), x, y, *paint);
223 canvas->restore();
224 }
225
onOnceBeforeDraw()226 void onOnceBeforeDraw() override {
227 fEmFace.reset(GetResourceAsTypeface("/fonts/Em.ttf"));
228 }
229
onDraw(SkCanvas * canvas)230 void onDraw(SkCanvas* canvas) override {
231 if (false) { test_stroke(canvas); return; }
232
233 SkPaint paint;
234 paint.setAntiAlias(true);
235 paint.setTypeface(fEmFace);
236 paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
237 paint.setStrokeWidth(SkIntToScalar(4));
238 paint.setTextSize(SkIntToScalar(40));
239 paint.setTextAlign(SkPaint::kCenter_Align);
240
241 canvas->save();
242 canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
243 // translate (1 point)
244 const int src1[] = { 0, 0 };
245 const int dst1[] = { 5, 5 };
246 doDraw(canvas, &paint, src1, dst1, 1);
247 canvas->restore();
248
249 canvas->save();
250 canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
251 // rotate/uniform-scale (2 points)
252 const int src2[] = { 32, 32, 64, 32 };
253 const int dst2[] = { 32, 32, 64, 48 };
254 doDraw(canvas, &paint, src2, dst2, 2);
255 canvas->restore();
256
257 canvas->save();
258 canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
259 // rotate/skew (3 points)
260 const int src3[] = { 0, 0, 64, 0, 0, 64 };
261 const int dst3[] = { 0, 0, 96, 0, 24, 64 };
262 doDraw(canvas, &paint, src3, dst3, 3);
263 canvas->restore();
264
265 canvas->save();
266 canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
267 // perspective (4 points)
268 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
269 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
270 doDraw(canvas, &paint, src4, dst4, 4);
271 canvas->restore();
272 }
273
274 private:
275 typedef skiagm::GM INHERITED;
276 SkAutoTUnref<SkTypeface> fEmFace;
277 };
278
279 //////////////////////////////////////////////////////////////////////////////
280
281 DEF_GM( return new Poly2PolyGM; )
282