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LibWeb: Fix CRC2D.getImageData() when width != height

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We were mistakenly using the width as both width and height when getting
ImageData from a 2D canvas.
This commit is contained in:
Andreas Kling 2024-04-15 09:36:57 +02:00
commit 134c4b6335
Notes: sideshowbarker 2024-07-17 07:16:27 +09:00
3 changed files with 14 additions and 1 deletions
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2
Tests/LibWeb/Text/expected/HTML/canvas-getImageData-oblong.txt Normal file
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@ -0,0 +1,2 @@
[object ImageData]
PASS: Didn't crash

11
Tests/LibWeb/Text/input/HTML/canvas-getImageData-oblong.html Normal file
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@ -0,0 +1,11 @@
<script src="../include.js"></script>
<body><canvas id=c width=1 height=2></div>
<script>
test(() => {
let x = c.getContext("2d");
x.clearRect(0, 0, 1, 1);
let d = x.getImageData(0, 0, 1, 2);
println(d);
println("PASS: Didn't crash");
});
</script>

2
Userland/Libraries/LibWeb/HTML/ImageData.cpp
View file

@ -29,7 +29,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> ImageData::create(JS::Realm& re
// 2. Initialize this given sw, sh, and settings set to settings. // 2. Initialize this given sw, sh, and settings set to settings.
// 3. Initialize the image data of this to transparent black. // 3. Initialize the image data of this to transparent black.
auto data = TRY(JS::Uint8ClampedArray::create(realm, sw * sh * 4)); auto data = TRY(JS::Uint8ClampedArray::create(realm, sw * sh * 4));
auto bitmap = TRY_OR_THROW_OOM(vm, Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGBA8888, Gfx::IntSize(sw, sw), 1, sw * sizeof(u32), data->data().data())); auto bitmap = TRY_OR_THROW_OOM(vm, Gfx::Bitmap::create_wrapper(Gfx::BitmapFormat::RGBA8888, Gfx::IntSize(sw, sh), 1, sw * sizeof(u32), data->data().data()));
return realm.heap().allocate<ImageData>(realm, realm, bitmap, data); return realm.heap().allocate<ImageData>(realm, realm, bitmap, data);
} }