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kms-plane: Restore adding format fallbacks

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There were fallbacks in place in case IN_FORMATS didn't yield any usable
formats: the formats in the drmModePlane struct, and a hard coded array.
The lack of these fallbacks in place could result in a segfault as code
using the supported plane formats assumed there were at least something
in there.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/662
This commit is contained in:
Jonas Ådahl 2019-06-28 15:04:44 +02:00 committed by Georges Basile Stavracas Neto
parent b138006bb7
commit dc5925b7d1
1 changed files with 47 additions and 1 deletions
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48
src/backends/native/meta-kms-plane.c
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@ -22,6 +22,7 @@
#include "backends/native/meta-kms-plane.h"
#include <drm/drm_fourcc.h>
#include <stdio.h>
#include "backends/meta-monitor-transform.h"
@ -293,9 +294,39 @@ parse_formats (MetaKmsPlane *plane,
drmModeFreePropertyBlob (blob);
}
static void
set_formats_from_array (MetaKmsPlane *plane,
const uint32_t *formats,
size_t n_formats)
{
size_t i;
for (i = 0; i < n_formats; i++)
{
g_hash_table_insert (plane->formats_modifiers,
GUINT_TO_POINTER (formats[i]), NULL);
}
}
/*
* In case the DRM driver does not expose a format list for the
* primary plane (does not support universal planes nor
* IN_FORMATS property), hardcode something that is probably supported.
*/
static const uint32_t drm_default_formats[] =
{
/* The format everything should always support by convention */
DRM_FORMAT_XRGB8888,
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
/* OpenGL GL_RGBA, GL_UNSIGNED_BYTE format, hopefully supported */
DRM_FORMAT_XBGR8888
#endif
};
static void
init_formats (MetaKmsPlane *plane,
MetaKmsImplDevice *impl_device,
drmModePlane *drm_plane,
drmModeObjectProperties *drm_plane_props)
{
drmModePropertyPtr prop;
@ -317,6 +348,21 @@ init_formats (MetaKmsPlane *plane,
parse_formats (plane, impl_device, blob_id);
drmModeFreeProperty (prop);
}
if (g_hash_table_size (plane->formats_modifiers) == 0)
{
set_formats_from_array (plane,
drm_plane->formats,
drm_plane->count_formats);
}
/* final formats fallback to something hardcoded */
if (g_hash_table_size (plane->formats_modifiers) == 0)
{
set_formats_from_array (plane,
drm_default_formats,
G_N_ELEMENTS (drm_default_formats));
}
}
MetaKmsPlane *
@ -334,7 +380,7 @@ meta_kms_plane_new (MetaKmsPlaneType type,
plane->device = meta_kms_impl_device_get_device (impl_device);
init_rotations (plane, impl_device, drm_plane_props);
init_formats (plane, impl_device, drm_plane_props);
init_formats (plane, impl_device, drm_plane, drm_plane_props);
return plane;
}