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Bug 670442: Reset mZero flag on the CanvasRenderingContext when new dimensions are set. r=joe

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This commit is contained in:
Benjamin Peterson 2011-07-12 08:54:38 -07:00
parent 275db5cd96
commit 6806ca5d95
3 changed files with 31 additions and 0 deletions
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2
content/canvas/src/nsCanvasRenderingContext2D.cpp
View File

@ -1068,6 +1068,8 @@ nsCanvasRenderingContext2D::SetDimensions(PRInt32 width, PRInt32 height)
mZero = PR_TRUE;
height = 1;
width = 1;
} else {
mZero = PR_FALSE;
}
gfxASurface::gfxImageFormat format = GetImageFormat();

2
content/canvas/src/nsCanvasRenderingContext2DAzure.cpp
View File

@ -1226,6 +1226,8 @@ nsCanvasRenderingContext2DAzure::SetDimensions(PRInt32 width, PRInt32 height)
mZero = PR_TRUE;
height = 1;
width = 1;
} else {
mZero = PR_FALSE;
}
// Check that the dimensions are sane

27
content/canvas/test/test_canvas.html
View File

@ -21392,6 +21392,27 @@ function test_zero_dimensions_imagedata() {
}
</script>
<p>Canvas test: getImageData_after_zero_canvas</p>
<canvas id="c686" width="100" height="100"></canvas>
<script type="text/javascript">
function test_getImageData_after_zero_canvas() {
var c = document.getElementById("c686");
var ctx = c.getContext("2d");
ctx.fillStyle = "rgba(0, 0, 0, 1.0)";
ctx.fillRect(0, 0, c.width, c.height);
var oldimgdata = ctx.getImageData(0, 0, c.width, c.height);
c.width = c.height = 0;
c.width = c.height = 100;
ctx.fillRect(0, 0, c.width, c.height);
var imgdata = ctx.getImageData(0, 0, c.width, c.height);
var same = false;
ok(imgdata.data.length === oldimgdata.data.length, "not the same length");
for (var i = 0; i < imgdata.data.length; ++i)
same = imgdata.data[i] === oldimgdata.data[i];
ok(same, "changing dimensions broke canvas");
}
</script>
<script>
function asyncTestsDone() {
@ -24661,6 +24682,12 @@ function runTests() {
} catch(e) {
ok(false, "unexpected exception thrown in: test_zero_dimensions_imagedata");
}
try {
test_getImageData_after_zero_canvas();
} catch(e) {
throw e;
ok(false, "unexpected exception thrown in: test_getImageData_after_zero_canvas");
}
try {
// run this test last since it replaces the getContext method
test_type_replace();