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wayland: Add single pixel buffer support

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The "single pixel buffer" Wayland protocol extension provides a way for
clients to create 1x1 buffers with a single color, specified by
providing the color channels (red, green and blue) as well as the
alpha channel as a 32 bit unsigned integer.

For now, this is turned into a 1x1 texture. Future potential
improvements is to hook things up to the scanout candidate logic and
turn it into a scanout capable DMA buffer.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2246>
This commit is contained in:
Jonas Ådahl
2022-01-19 11:49:32 +01:00
committed by Marge Bot
parent 823e3a5c72
commit 2cb7499735
8 changed files with 255 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/wayland/meta-wayland-buffer.c
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@ -140,6 +140,7 @@ meta_wayland_buffer_realize (MetaWaylandBuffer *buffer)
MetaWaylandEglStream *stream;
#endif
MetaWaylandDmaBufBuffer *dma_buf;
MetaWaylandSinglePixelBuffer *single_pixel_buffer;
if (wl_shm_buffer_get (buffer->resource) != NULL)
{
@ -194,6 +195,14 @@ meta_wayland_buffer_realize (MetaWaylandBuffer *buffer)
return TRUE;
}
single_pixel_buffer = meta_wayland_single_pixel_buffer_from_buffer (buffer);
if (single_pixel_buffer)
{
buffer->single_pixel.single_pixel_buffer = single_pixel_buffer;
buffer->type = META_WAYLAND_BUFFER_TYPE_SINGLE_PIXEL;
return TRUE;
}
return FALSE;
}
@ -576,6 +585,10 @@ meta_wayland_buffer_attach (MetaWaylandBuffer *buffer,
return meta_wayland_dma_buf_buffer_attach (buffer,
texture,
error);
case META_WAYLAND_BUFFER_TYPE_SINGLE_PIXEL:
return meta_wayland_single_pixel_buffer_attach (buffer,
texture,
error);
case META_WAYLAND_BUFFER_TYPE_UNKNOWN:
g_assert_not_reached ();
return FALSE;
@ -682,6 +695,7 @@ meta_wayland_buffer_process_damage (MetaWaylandBuffer *buffer,
case META_WAYLAND_BUFFER_TYPE_EGL_STREAM:
#endif
case META_WAYLAND_BUFFER_TYPE_DMA_BUF:
case META_WAYLAND_BUFFER_TYPE_SINGLE_PIXEL:
res = TRUE;
break;
case META_WAYLAND_BUFFER_TYPE_UNKNOWN:
@ -757,6 +771,7 @@ meta_wayland_buffer_try_acquire_scanout (MetaWaylandBuffer *buffer,
switch (buffer->type)
{
case META_WAYLAND_BUFFER_TYPE_SHM:
case META_WAYLAND_BUFFER_TYPE_SINGLE_PIXEL:
return NULL;
case META_WAYLAND_BUFFER_TYPE_EGL_IMAGE:
return try_acquire_egl_image_scanout (buffer, onscreen);
@ -795,6 +810,9 @@ meta_wayland_buffer_finalize (GObject *object)
#endif
g_clear_pointer (&buffer->dma_buf.texture, cogl_object_unref);
g_clear_object (&buffer->dma_buf.dma_buf);
g_clear_pointer (&buffer->single_pixel.single_pixel_buffer,
meta_wayland_single_pixel_buffer_free);
cogl_clear_object (&buffer->single_pixel.texture);
G_OBJECT_CLASS (meta_wayland_buffer_parent_class)->finalize (object);
}