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background: Scale monitor_area after texture creation

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Scaling the `monitor_area` before texture creation was just wasting
megabytes of memory on resolution that the monitor can't display. This
was also hurting runtime performance.

Example:

  Monitor is natively 1920x1080 and scale set to 3.

  Before: The monitor texture allocated was 5760x3250x4 = 74.6 MB
  After:  The monitor texture allocated is  1920x1080x4 =  8.3 MB

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/2118

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1004
This commit is contained in:
Daniel van Vugt 2020-01-13 21:02:39 +08:00 committed by Robert Mader
parent 9b0392e988
commit 76240e24f7
1 changed files with 25 additions and 11 deletions
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36
src/compositor/meta-background.c
View file

@ -23,6 +23,7 @@
#include <string.h>
#include "backends/meta-backend-private.h"
#include "compositor/cogl-utils.h"
#include "meta/display.h"
#include "meta/meta-background-image.h"
@ -799,6 +800,30 @@ meta_background_get_texture (MetaBackground *self,
{
GError *catch_error = NULL;
gboolean bare_region_visible = FALSE;
int texture_width, texture_height;
if (meta_is_stage_views_scaled ())
{
texture_width = monitor_area.width * monitor_scale;
texture_height = monitor_area.height * monitor_scale;
}
else
{
texture_width = monitor_area.width;
texture_height = monitor_area.height;
}
if (monitor->texture == NULL)
{
CoglOffscreen *offscreen;
monitor->texture = meta_create_texture (texture_width,
texture_height,
COGL_TEXTURE_COMPONENTS_RGBA,
META_TEXTURE_FLAGS_NONE);
offscreen = cogl_offscreen_new_with_texture (monitor->texture);
monitor->fbo = COGL_FRAMEBUFFER (offscreen);
}
if (self->style != G_DESKTOP_BACKGROUND_STYLE_WALLPAPER)
{
@ -808,17 +833,6 @@ meta_background_get_texture (MetaBackground *self,
monitor_area.height *= monitor_scale;
}
if (monitor->texture == NULL)
{
CoglOffscreen *offscreen;
monitor->texture = meta_create_texture (monitor_area.width, monitor_area.height,
COGL_TEXTURE_COMPONENTS_RGBA,
META_TEXTURE_FLAGS_NONE);
offscreen = cogl_offscreen_new_with_texture (monitor->texture);
monitor->fbo = COGL_FRAMEBUFFER (offscreen);
}
if (!cogl_framebuffer_allocate (monitor->fbo, &catch_error))
{
/* Texture or framebuffer allocation failed; it's unclear why this happened;