Bug 216860 – [GPU Process] fast/canvas/canvas-blend-image.html and fast/canvas/canvas-blend-solid.html fail on macOS

• Component: Canvas
• Status: RESOLVED FIXED

[Wenson Hsieh]

SSIA

[Wenson Hsieh]

Super simple test case:

```
<canvas width="1" height="1"></canvas>
<script>
let canvas = document.querySelector("canvas");
let context = canvas.getContext("2d");
context.fillStyle = "red";
context.fillRect(0, 0, 1, 1);

let data = context.getImageData(0, 0, 1, 1);
document.write(`This is solid red (RGBA): ${data.data[0]}, ${data.data[1]}, ${data.data[2]}, ${data.data[3]}`);
</script>
```

This is expected to output “This is solid red (RGBA): 255, 0, 0, 255”. However, when forcing unaccelerated remote image buffers using the GPU process, we get this instead:

“This is solid red (RGBA): 0, 0, 255, 255”

[Wenson Hsieh]

Created attachment 409434 [details]
Patch

[Said Abou-Hallawa]

Comment on attachment 409434 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=409434&action=review

> Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h:-63
> -#if PLATFORM(IOS_FAMILY)

This change will affect all platforms including Cairo. But I think this is the right behavior even for the Cairo surface.

[Wenson Hsieh]

Comment on attachment 409434 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=409434&action=review

>> Source/WebKit/WebProcess/GPU/graphics/ImageBufferShareableBitmapBackend.h:-63
>> -#if PLATFORM(IOS_FAMILY)
> 
> This change will affect all platforms including Cairo. But I think this is the right behavior even for the Cairo surface.

👍🏻

[EWS]

Committed r267459: <https://trac.webkit.org/changeset/267459>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 409434 [details].

[Radar WebKit Bug Importer]

<rdar://problem/69410569>