1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
|
<!DOCTYPE HTML>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body onload="runTest()" style="margin: 0; padding: 0">
<svg style="display: block; width: 0; height: 0">
<defs>
<filter id="colormatrix-make-green">
<feColorMatrix in="SourceGraphic" type="matrix" values="0 0 0 0 0
1 1 1 1 0
0 0 0 0 0
0 0 0 1 0"/>
</filter>
<filter id="use-feFlood-as-map-on-SourceGraphic">
<feFlood flood-color="lime" result='green'/>
<!-- should shift everything up and to the left by 8 pixels (only respects A channel) -->
<feDisplacementMap in="SourceGraphic" in2="green" scale="16"/>
</filter>
<filter id="render-cross-origin-red-feImage">
<feImage xlink:href="http://example.com/tests/dom/canvas/test/image_red-16x16.png"/>
</filter>
<filter id="generate-green">
<feFlood flood-color="lime" result='green'/>
</filter>
<filter id="use-SourceGraphic-as-map-on-red">
<feImage xlink:href='image_red-16x16.png' result='img'/>
<feDisplacementMap in="img" in2="SourceGraphic" scale="20"/>
</filter>
<filter id="use-cross-origin-green-feImage-as-map-on-same-origin-red">
<feImage xlink:href='image_red-16x16.png' result='img'/>
<feImage xlink:href='http://example.com/tests/dom/canvas/test/image_green-16x16.png' result='map'/>
<feDisplacementMap in="img" in2="map" scale="20"/>
</filter>
<filter id="use-cross-origin-red-feImage-as-map-on-SourceGraphic">
<feImage xlink:href='http://example.com/tests/dom/canvas/test/image_red-16x16.png' result='img'/>
<feDisplacementMap in="SourceGraphic" in2="img" scale="20"/>
</filter>
</defs>
</svg>
<div id="canvasContainer" style="height:100px;"></div>
<img id="same-origin-green" src="image_green-16x16.png"/>
<img id="same-origin-red" src="image_red-16x16.png"/>
<img id="cross-origin-green" src="http://example.com/tests/dom/canvas/test/image_green-16x16.png"/>
<img id="cross-origin-red" src="http://example.com/tests/dom/canvas/test/image_red-16x16.png"/>
<script>
function isPixel(ctx, x, y, r, g, b, a, d) {
var pixel = ctx.getImageData(x, y, 1, 1);
var pr = pixel.data[0],
pg = pixel.data[1],
pb = pixel.data[2],
pa = pixel.data[3];
var checkSucceeded = r - d <= pr && pr <= r + d &&
g - d <= pg && pg <= g + d &&
b - d <= pb && pb <= b + d &&
a - d <= pa && pa <= a + d;
ok(checkSucceeded,
`pixel ${x},${y} is ${pr},${pg},${pb},${pa}; expected ${r},${g},${b},${a} +/- ${d}`);
return checkSucceeded;
}
function expectCanvasCtxToBeTainted(ctx) {
try {
ctx.getImageData(0, 0, 16, 16);
ok(false, 'Canvas should have been tainted and should throw a SecurityError when calling getImageData.');
} catch (e) {
is(e.name, 'SecurityError', 'Canvas should have been tainted and should throw a SecurityError when calling getImageData.');
}
}
function expectCanvasCtxToBeUntainted(ctx) {
try {
var data = ctx.getImageData(0, 0, 16, 16);
ok(data, 'Canvas should have returned some ImageData from getImageData, and not thrown an error.');
} catch (e) {
ok(false, 'Canvas should not have prevented getImageData.');
}
}
function newCanvas() {
var canvas = document.createElement('canvas');
canvas.width = 16;
canvas.height = 16;
return canvas;
}
// This uses SpecialPowers + drawWindow and can check pixels even in tainted canvases.
function checkCanvasPixel(canvas, x, y, r, g, b, a, fuzz) {
var container = document.getElementById('canvasContainer');
container.appendChild(canvas);
var captureCanvas = newCanvas();
var captureCtx = SpecialPowers.wrap(captureCanvas.getContext('2d'));
captureCtx.drawWindow(window, 0, 0, 16, 16, 'rgb(255, 255, 255)', 0);
if (!isPixel(captureCtx, x, y, r, g, b, a, fuzz)) {
info(captureCanvas.toDataURL('image/png'));
}
container.removeChild(canvas);
}
function runTest() {
SpecialPowers.pushPrefEnv({ 'set': [['canvas.filters.enabled', true]] }, function () {
var sameOriginGreenImage = document.getElementById('same-origin-green');
var sameOriginRedImage = document.getElementById('same-origin-red');
var crossOriginGreenImage = document.getElementById('cross-origin-green');
var crossOriginRedImage = document.getElementById('cross-origin-red');
var canvas = newCanvas();
var ctx = canvas.getContext('2d');
// A CSS filter should not taint the canvas.
ctx.filter = 'grayscale(100%)';
ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 8,8, 92,92,92,255, 5);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// An SVG filter should not taint the canvas.
ctx.filter = 'url(#colormatrix-make-green)';
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 8,8, 0,255,0,255, 5);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// A CSS -> SVG -> CSS filter chain should not taint the canvas.
ctx.filter = 'grayscale(100%) url(#colormatrix-make-green) grayscale(100%)';
is(ctx.filter, 'grayscale(100%) url(#colormatrix-make-green) grayscale(100%)', 'filter chain should parse correctly');
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 8,8, 183,183,183,255, 5);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// An SVG -> CSS -> SVG filter chain should not taint the canvas.
ctx.filter = 'url(#colormatrix-make-green) grayscale(100%) url(#colormatrix-make-green)';
is(ctx.filter, 'url(#colormatrix-make-green) grayscale(100%) url(#colormatrix-make-green)', 'filter chain should parse correctly');
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 8,8, 0,255,0,255, 5);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// feDisplacementMap with untainted map input from feFlood should work and not taint
ctx.filter = 'url(#use-feFlood-as-map-on-SourceGraphic)';
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 4,4, 0,0,255,255, 1);
checkCanvasPixel(canvas, 12,4, 255,255,255,255, 1);
checkCanvasPixel(canvas, 4,12, 255,255,255,255, 1);
checkCanvasPixel(canvas, 12,12, 255,255,255,255, 1);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// feDisplacementMap with untainted map input from different SVG filter should work and not taint
ctx.filter = 'url(#generate-green) url(#use-SourceGraphic-as-map-on-red)';
is(ctx.filter, 'url(#generate-green) url(#use-SourceGraphic-as-map-on-red)', 'filter chain should parse correctly');
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,255,255,255, 1);
checkCanvasPixel(canvas, 4,12, 255,255,255,255, 1);
checkCanvasPixel(canvas, 12,12, 255,255,255,255, 1);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// feDisplacementMap with untainted map input from different CSS filter should work and not taint
ctx.filter = 'url(#generate-green) grayscale(100%) url(#use-SourceGraphic-as-map-on-red)';
is(ctx.filter, 'url(#generate-green) grayscale(100%) url(#use-SourceGraphic-as-map-on-red)', 'filter chain should parse correctly');
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,255,255,255, 1);
checkCanvasPixel(canvas, 4,12, 255,255,255,255, 1);
checkCanvasPixel(canvas, 12,12, 255,255,255,255, 1);
expectCanvasCtxToBeUntainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// drawImage with cross-origin image and SVG filter should apply the filter and taint the canvas.
ctx.filter = 'url(#colormatrix-make-green)';
ctx.drawImage(crossOriginRedImage, 0, 0);
checkCanvasPixel(canvas, 8,8, 0,255,0,255, 1);
expectCanvasCtxToBeTainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// Create new untainted canvas.
canvas = newCanvas();
ctx = canvas.getContext('2d');
// drawImage with cross-origin image and CSS filter should apply the filter and taint the canvas.
ctx.filter = 'grayscale(100%)';
ctx.drawImage(crossOriginRedImage, 0, 0);
checkCanvasPixel(canvas, 8,8, 53,53,53,255, 1);
expectCanvasCtxToBeTainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// feDisplacementMap with untainted map input from different CSS filter should work even on tainted canvas
ctx.filter = 'url(#generate-green) grayscale(100%) url(#use-SourceGraphic-as-map-on-red)';
is(ctx.filter, 'url(#generate-green) grayscale(100%) url(#use-SourceGraphic-as-map-on-red)', 'filter chain should parse correctly');
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,255,255,255, 1);
checkCanvasPixel(canvas, 4,12, 255,255,255,255, 1);
checkCanvasPixel(canvas, 12,12, 255,255,255,255, 1);
expectCanvasCtxToBeTainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// feDisplacementMap with untainted map input from feFlood should work even on tainted canvas
ctx.filter = 'url(#use-feFlood-as-map-on-SourceGraphic)';
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 4,4, 0,0,255,255, 1);
checkCanvasPixel(canvas, 12,4, 255,255,255,255, 1);
checkCanvasPixel(canvas, 4,12, 255,255,255,255, 1);
checkCanvasPixel(canvas, 12,12, 255,255,255,255, 1);
expectCanvasCtxToBeTainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// Create new untainted canvas.
canvas = newCanvas();
ctx = canvas.getContext('2d');
// cross-origin feImage should render correctly and taint the canvas
ctx.filter = 'url(#render-cross-origin-red-feImage)';
ctx.rect(0, 0, 16, 16);
ctx.fill();
checkCanvasPixel(canvas, 8,8, 255,0,0,255, 5);
expectCanvasCtxToBeTainted(ctx);
// Create new untainted canvas.
canvas = newCanvas();
ctx = canvas.getContext('2d');
// cross-origin feImage should be ignored as map input to a displacement map, and taint the canvas.
ctx.filter = 'url(#use-cross-origin-green-feImage-as-map-on-same-origin-red)';
ctx.rect(0, 0, 16, 16);
ctx.fill();
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 4,12, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,12, 255,0,0,255, 1);
expectCanvasCtxToBeTainted(ctx);
// Create new untainted canvas.
canvas = newCanvas();
ctx = canvas.getContext('2d');
expectCanvasCtxToBeUntainted(ctx);
// cross-origin SourceGraphic should be ignored as map input to a displacement map, and taint the canvas.
// SourceGraphic: cross-origin image_green-16x16.png,
// gets used as map to shift same-origin image_red-16x16.png,
// but should get ignored so that image_red-16x16.png gets drawn unshifted.
ctx.filter = 'url(#use-SourceGraphic-as-map-on-red)';
ctx.drawImage(crossOriginGreenImage, 0, 0);
// expect to see red because cross-origin image_green-16x16.png should not have displaced the red away
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 4,12, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,12, 255,0,0,255, 1);
expectCanvasCtxToBeTainted(ctx);
// cross-origin feImage should be ignored as map to displacement map, and taint the canvas.
// SourceGraphic: cross-origin image_green-16x16.png,
// Cross-origin feImage image_red-16x16.png gets used as map to shift SourceGraphic,
// but should get ignored so that image_green-16x16.png gets drawn unshifted.
ctx.filter = 'url(#use-cross-origin-red-feImage-as-map-on-SourceGraphic)';
ctx.drawImage(crossOriginGreenImage, 0, 0);
// expect to see green because cross-origin image_red-16x16.png should not have displaced the green away
checkCanvasPixel(canvas, 4,4, 0,255,0,255, 1);
checkCanvasPixel(canvas, 12,4, 0,255,0,255, 1);
checkCanvasPixel(canvas, 4,12, 0,255,0,255, 1);
checkCanvasPixel(canvas, 12,12, 0,255,0,255, 1);
expectCanvasCtxToBeTainted(ctx);
// Create new untainted canvas.
canvas = newCanvas();
ctx = canvas.getContext('2d');
// feDisplacementMap with tainted map input from different CSS filter should be ignored
ctx.filter = 'grayscale(100%) url(#use-SourceGraphic-as-map-on-red)';
is(ctx.filter, 'grayscale(100%) url(#use-SourceGraphic-as-map-on-red)', 'filter chain should parse correctly');
ctx.drawImage(crossOriginGreenImage, 0, 0);
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 4,12, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,12, 255,0,0,255, 1);
expectCanvasCtxToBeTainted(ctx);
ctx.clearRect(0, 0, 16, 16);
// Create new untainted canvas.
canvas = newCanvas();
ctx = canvas.getContext('2d');
// feDisplacementMap with tainted feImage map input from different SVG filter should be ignored
ctx.filter = 'url(#render-cross-origin-red-feImage) url(#use-SourceGraphic-as-map-on-red)';
is(ctx.filter, 'url(#render-cross-origin-red-feImage) url(#use-SourceGraphic-as-map-on-red)', 'filter chain should parse correctly');
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 16, 16);
checkCanvasPixel(canvas, 4,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,4, 255,0,0,255, 1);
checkCanvasPixel(canvas, 4,12, 255,0,0,255, 1);
checkCanvasPixel(canvas, 12,12, 255,0,0,255, 1);
expectCanvasCtxToBeTainted(ctx);
// Paint 'canvas' (which is red and tainted) into a different canvas and makes sure it taints that other canvas.
var secondCanvas = newCanvas();
var secondCtx = secondCanvas.getContext('2d');
secondCtx.filter = 'grayscale(100%)';
secondCtx.drawImage(canvas, 0, 0);
checkCanvasPixel(secondCanvas, 4,4, 53,53,53,255, 1);
checkCanvasPixel(secondCanvas, 12,4, 53,53,53,255, 1);
checkCanvasPixel(secondCanvas, 4,12, 53,53,53,255, 1);
checkCanvasPixel(secondCanvas, 12,12, 53,53,53,255, 1);
expectCanvasCtxToBeTainted(secondCtx);
// Fill the left half with blue (i.e. an untainted SourceGraphic) and make sure the canvas is still tainted.
secondCtx.fillStyle = "blue";
secondCtx.fillRect(0, 0, 8, 16);
checkCanvasPixel(secondCanvas, 4,4, 17,17,17,255, 1);
checkCanvasPixel(secondCanvas, 12,4, 53,53,53,255, 1);
checkCanvasPixel(secondCanvas, 4,12, 17,17,17,255, 1);
checkCanvasPixel(secondCanvas, 12,12, 53,53,53,255, 1);
expectCanvasCtxToBeTainted(secondCtx);
SimpleTest.finish();
});
}
SimpleTest.waitForExplicitFinish();
</script>
|
