221330 2021-02-03 06:30:59 -0800 [WPE][GTK] Wrong rendering when using opacity filters on hw accelerated layers 2021-02-04 00:42:14 -0800 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 magomez magomez bugs-noreply cgarcia cmarcelo ews-watchlist kondapallykalyan luiz oldest_to_newest 1725114 0 magomez 2021-02-03 06:30:59 -0800 I found this while I was looking for a fix to bug 184143. I've put a test case in https://people.igalia.com/magomez/opacity/index.html so the problem is visible: both columns show the images with opacity filters (opacity grows as we go down). The left column doesn't use GraphicsLayers for the images (and it produces the correct output), but the right column uses them and the result is wrong. There's a test for this css3/filters/effect-opacity-hw.html but we have a custom png result for GTK (which is wrong) and no png for WPE. There's also a txt result, but that's fine both for GTK and WPE. The GTK png must be updated when this is fixed. The problem is in the fragment shader, in how applyOpacityFilter() applies the opacity to the layer. It just applies it to the alpha channel, and not the colors. But we need the alpha to be premultiplied in order to perform a correct blending (check how applyOpacity() applies the value to the colors as well). If the colors are not premultiplied, then the alpha of the source texture is not taken into account (which means that a texture with 0 alpha will become visible when blending). 1725115 1 419131 magomez 2021-02-03 06:36:17 -0800 Created attachment 419131 Patch 1725544 2 ews-feeder 2021-02-04 00:42:12 -0800 Committed r272361: <https://trac.webkit.org/changeset/272361> All reviewed patches have been landed. Closing bug and clearing flags on attachment 419131. 419131 2021-02-03 06:36:17 -0800 2021-02-04 00:42:13 -0800 Patch bug-221330-20210203153616.patch text/plain 8703 magomez U3VidmVyc2lvbiBSZXZpc2lvbjogMjcyMzA3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNTNhZmE5MTE3MDA3OWFl NjQ3OThmZGRkZGUzNmY0NTMyZTU5Nzk5Zi4uY2MzZDRmMzdiZTc3MTkxMDcxYmE1YjJlNjdiODQ0 ZmJkYzlkNDY1OSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE3IEBACisyMDIxLTAyLTAzICBNaWd1 ZWwgR29tZXogIDxtYWdvbWV6QGlnYWxpYS5jb20+CisKKyAgICAgICAgW1dQRV1bR1RLXSBXcm9u ZyByZW5kZXJpbmcgd2hlbiB1c2luZyBvcGFjaXR5IGZpbHRlcnMgb24gaHcgYWNjZWxlcmF0ZWQg bGF5ZXJzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0y MjEzMzAKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBB cHBseSB0aGUgb3BhY2l0eSBmaWx0ZXIgdmFsdWUgdG8gdGhlIGNvbG9yIGNvbXBvbmVudHMgYXMg 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