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Bug 1875345 - Report 24 instead of 32 as the colorDepth (and pixelDepth) on Linux (assuming 8 of 32 bits are for the alpha channel).

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This now matches the logic in our equivalent Windows code, and this is
also per spec ("number of bits...excluding the alpha channel"):
https://drafts.csswg.org/cssom-view/#dom-screen-colordepth
With this change, the WPT test starts passing on Ubuntu 22.04
(which was previously flagged as an unexpected failure).
This commit is contained in:
Moonchild 2025-08-14 17:50:18 +02:00 • committed by roytam1
commit e3de626c1f
1 changed files with 8 additions and 4 deletions
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12
widget/gtk/nsScreenGtk.cpp
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@ -97,17 +97,21 @@ NS_IMETHODIMP
nsScreenGtk :: GetPixelDepth(int32_t *aPixelDepth)
{
GdkVisual * visual = gdk_screen_get_system_visual(gdk_screen_get_default());
*aPixelDepth = gdk_visual_get_depth(visual);
uint32_t pixelDepth = gdk_visual_get_depth(visual);
if (pixelDepth == 32) {
// If a device reports 32 bits per pixel, it's still only using 8 bits
// per color component, which is what our callers want to know.
// (Some devices report 32 and some devices report 24, because Linux)
pixelDepth = 24;
}
*aPixelDepth = pixelDepth;
return NS_OK;
} // GetPixelDepth
NS_IMETHODIMP
nsScreenGtk :: GetColorDepth(int32_t *aColorDepth)
{
return GetPixelDepth ( aColorDepth );
} // GetColorDepth
NS_IMETHODIMP