Commit cdb53ce6 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont

XCB/X11: rework and fix color depth selection

parent 53752a74
......@@ -92,6 +92,22 @@ static void Manage (vout_display_t *);
static void ResetPictures (vout_display_t *);
static const xcb_depth_t *FindDepth (const xcb_screen_t *scr,
uint_fast8_t depth)
{
xcb_depth_t *d = NULL;
for (xcb_depth_iterator_t it = xcb_screen_allowed_depths_iterator (scr);
it.rem > 0 && d == NULL;
xcb_depth_next (&it))
{
if (it.data->depth == depth)
d = it.data;
}
return d;
}
/**
* Probe the X server.
*/
......@@ -107,7 +123,7 @@ static int Open (vlc_object_t *obj)
/* Get window, connect to X server */
const xcb_screen_t *scr;
p_sys->embed = GetWindow (vd, &p_sys->conn, &scr, &p_sys->depth);
p_sys->embed = GetWindow (vd, &p_sys->conn, &scr, &(uint8_t){ 0 });
if (p_sys->embed == NULL)
{
free (p_sys);
......@@ -117,60 +133,19 @@ static int Open (vlc_object_t *obj)
const xcb_setup_t *setup = xcb_get_setup (p_sys->conn);
p_sys->byte_order = setup->image_byte_order;
/* */
video_format_t fmt_pic = vd->fmt;
/* Check that the selected screen supports this depth */
xcb_depth_t *d = NULL;
for (xcb_depth_iterator_t it = xcb_screen_allowed_depths_iterator (scr);
it.rem > 0 && d == NULL;
xcb_depth_next (&it))
if (it.data->depth == p_sys->depth)
d = it.data;
if (d == NULL)
{
msg_Err (obj, "unexpected color depth msimatch");
goto error; /* WTH? depth not supported on screen */
}
/* Find a visual type for the selected depth */
/* Determine our pixel format */
xcb_visualid_t vid = 0;
bool gray = true;
const xcb_visualtype_t *vt = xcb_depth_visuals (d);
for (int i = xcb_depth_visuals_length (d); i > 0; i--)
{
if (vt->_class == XCB_VISUAL_CLASS_TRUE_COLOR)
{
vid = vt->visual_id;
fmt_pic.i_rmask = vt->red_mask;
fmt_pic.i_gmask = vt->green_mask;
fmt_pic.i_bmask = vt->blue_mask;
gray = false;
break;
}
if (p_sys->depth == 8 && vt->_class == XCB_VISUAL_CLASS_STATIC_GRAY
&& vid == 0)
{
vid = vt->visual_id;
}
}
p_sys->depth = 0;
if (!vid)
{
msg_Err (obj, "unexpected visual type mismatch");
goto error;
}
msg_Dbg (vd, "using X11 visual ID 0x%"PRIx32" (depth: %"PRIu8")", vid,
p_sys->depth);
/* Determine our pixel format */
p_sys->bpp = 0;
for (const xcb_format_t *fmt = xcb_setup_pixmap_formats (setup),
*end = fmt + xcb_setup_pixmap_formats_length (setup);
fmt < end && !p_sys->bpp; fmt++)
fmt < end;
fmt++)
{
if (fmt->depth != p_sys->depth)
continue; /* Wrong depth! */
if (fmt->depth <= p_sys->depth)
continue; /* no better than earlier format */
video_format_t fmt_pic = vd->fmt;
/* Check that the pixmap format is supported by VLC. */
switch (fmt->depth)
......@@ -206,31 +181,73 @@ static int Open (vlc_object_t *obj)
case 8:
if (fmt->bits_per_pixel != 8)
continue;
fmt_pic.i_chroma = gray ? VLC_CODEC_GREY : VLC_CODEC_RGB8;
fmt_pic.i_chroma = VLC_CODEC_RGB8;
break;
default:
continue;
}
/* VLC pads lines to 16 pixels internally */
if ((fmt->bits_per_pixel << 4) % fmt->scanline_pad)
continue; /* VLC pads lines to 16 pixels internally */
continue;
/* Byte sex is a non-issue for 8-bits. It can be worked around with
* RGB masks for 24-bits. Too bad for 15-bits and 16-bits. */
if (fmt->bits_per_pixel == 16 && setup->image_byte_order != ORDER)
continue;
/* Check that the selected screen supports this depth */
const xcb_depth_t *d = FindDepth (scr, fmt->depth);
if (d == NULL)
continue;
/* Find a visual type for the selected depth */
const xcb_visualtype_t *vt = xcb_depth_visuals (d);
/* First try True Color class */
for (int i = xcb_depth_visuals_length (d); i > 0; i--)
{
if (vt->_class == XCB_VISUAL_CLASS_TRUE_COLOR)
{
fmt_pic.i_rmask = vt->red_mask;
fmt_pic.i_gmask = vt->green_mask;
fmt_pic.i_bmask = vt->blue_mask;
goto found_visual;
}
vt++;
}
/* Then try Static Gray class */
if (fmt->depth == 8)
for (int i = xcb_depth_visuals_length (d); i > 0 && !vid; i--)
{
if (vt->_class == XCB_VISUAL_CLASS_STATIC_GRAY)
goto found_grey;
vt++;
}
continue; /* Fail: unusable pixel format */
found_grey:
fmt_pic.i_chroma = VLC_CODEC_GREY;
found_visual:
p_sys->bpp = fmt->bits_per_pixel;
p_sys->pad = fmt->scanline_pad;
msg_Dbg (vd, " %"PRIu8" bits per pixels, %"PRIu8" bits line pad",
p_sys->bpp, p_sys->pad);
p_sys->depth = fmt->depth;
vd->fmt = fmt_pic;
vid = vt->visual_id;
}
if (!p_sys->bpp)
if (!vid)
{
msg_Err (vd, "no supported pixmap formats");
msg_Err (obj, "no supported pixel format & visual");
goto error;
}
msg_Dbg (vd, "using X11 visual ID 0x%"PRIx32, vid);
msg_Dbg (vd, " %"PRIu8" bits depth", p_sys->depth);
msg_Dbg (vd, " %"PRIu8" bits per pixel", p_sys->bpp);
msg_Dbg (vd, " %"PRIu8" bits line pad", p_sys->pad);
/* Create colormap (needed to select non-default visual) */
xcb_colormap_t cmap;
if (vid != scr->root_visual)
......@@ -302,7 +319,6 @@ static int Open (vlc_object_t *obj)
info.has_event_thread = true;
/* Setup vout_display_t once everything is fine */
vd->fmt = fmt_pic;
vd->info = info;
vd->pool = Pool;
......
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