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wayland-dma-buf: Fix 32bpp channel order inversion

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Apparently my understanding of Cogl pixel formats, or at least their
use, was somewhat shaky.

Un-invert the inversion of the DRM FourCC -> Cogl pixel format mapping
when creating dmabufs from clients, fixing inverted channel ordering
seen from GL clients, e.g. gold highlights in gtk4-demo when using the
GSK GL backend when they should be blue.

https://bugzilla.gnome.org/show_bug.cgi?id=786677
This commit is contained in:
Daniel Stone 2017-08-24 10:14:31 +01:00 committed by Carlos Garnacho
parent c248feb3c1
commit 06d0989014
1 changed files with 2 additions and 5 deletions
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7
src/wayland/meta-wayland-dma-buf.c
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@ -83,16 +83,13 @@ meta_wayland_dma_buf_buffer_attach (MetaWaylandBuffer *buffer,
if (buffer->texture)
return TRUE;
/* DRM_FORMAT_* enums consider the entire pixel as a single packed quantity,
* with little-endian ordering. COGL_PIXEL_FORMAT_* is in byte order when
* each channel is an 8-byte unit. Hence these have order swapped. */
switch (dma_buf->drm_format)
{
case DRM_FORMAT_XRGB8888:
cogl_format = COGL_PIXEL_FORMAT_BGR_888;
cogl_format = COGL_PIXEL_FORMAT_RGB_888;
break;
case DRM_FORMAT_ARGB8888:
cogl_format = COGL_PIXEL_FORMAT_BGRA_8888_PRE;
cogl_format = COGL_PIXEL_FORMAT_ARGB_8888_PRE;
break;
case DRM_FORMAT_ARGB2101010:
cogl_format = COGL_PIXEL_FORMAT_ARGB_2101010_PRE;