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mutter/src/compositor/meta-background.c
Daniel van Vugt 7a0bc5af7f background: Limit mipmap levels to avoid loss of visible detail 
When the wallpaper image is larger than the monitor resolution we already
use mipmapping to scale it down smoothly in hardware. We use
`GL_TEXTURE_MIN_FILTER` = `GL_LINEAR_MIPMAP_LINEAR` for the highest quality
scaling that GL can do. However that option is designed for 3D use cases
where the mipmap level is changing over time or space.

Since our wallpaper is not changing distance from us we can improve the
rendering quality even more than `GL_LINEAR_MIPMAP_LINEAR`. To do this we
now set `GL_TEXTURE_MAX_LEVEL` (if available) to limit the mipmap level or
blurriness level to the lowest resolution (highest level) that is still
equal to or higher than the monitor itself. This way we get the benefits
of mipmapping (downscaling in hardware) *and* retain the maximum possible
sharpness for the monitor resolution -- something that
`GL_LINEAR_MIPMAP_LINEAR` alone doesn't do.

Example:

  Monitor is 1920x1080
  Wallpaper photo is 4000x3000
  Mipmaps stored on the GPU are 4000x3000, 2000x1500, 1000x750, ...

  Before: You would see an average of the 2000x1500 and 1000x750 images.
  After:  You will now only see the 2000x1500 image, linearly sampled.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1003
2020-05-13 09:37:31 +00:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright 2013 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "compositor/meta-background-private.h"
#include <string.h>
#include "backends/meta-backend-private.h"
#include "compositor/cogl-utils.h"
#include "meta/display.h"
#include "meta/meta-background-image.h"
#include "meta/meta-background.h"
#include "meta/meta-monitor-manager.h"
#include "meta/util.h"
enum
{
CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
typedef struct _MetaBackgroundMonitor MetaBackgroundMonitor;
struct _MetaBackgroundMonitor
{
gboolean dirty;
CoglTexture *texture;
CoglFramebuffer *fbo;
};
struct _MetaBackground
{
GObject parent;
MetaDisplay *display;
MetaBackgroundMonitor *monitors;
int n_monitors;
GDesktopBackgroundStyle style;
GDesktopBackgroundShading shading_direction;
ClutterColor color;
ClutterColor second_color;
GFile *file1;
MetaBackgroundImage *background_image1;
GFile *file2;
MetaBackgroundImage *background_image2;
CoglTexture *color_texture;
CoglTexture *wallpaper_texture;
float blend_factor;
guint wallpaper_allocation_failed : 1;
};
enum
{
PROP_META_DISPLAY = 1,
PROP_MONITOR,
};
G_DEFINE_TYPE (MetaBackground, meta_background, G_TYPE_OBJECT)
static gboolean texture_has_alpha (CoglTexture *texture);
static GSList *all_backgrounds = NULL;
static void
free_fbos (MetaBackground *self)
{
int i;
for (i = 0; i < self->n_monitors; i++)
{
MetaBackgroundMonitor *monitor = &self->monitors[i];
if (monitor->fbo)
{
cogl_object_unref (monitor->fbo);
monitor->fbo = NULL;
}
if (monitor->texture)
{
cogl_object_unref (monitor->texture);
monitor->texture = NULL;
}
}
}
static void
free_color_texture (MetaBackground *self)
{
if (self->color_texture != NULL)
{
cogl_object_unref (self->color_texture);
self->color_texture = NULL;
}
}
static void
free_wallpaper_texture (MetaBackground *self)
{
if (self->wallpaper_texture != NULL)
{
cogl_object_unref (self->wallpaper_texture);
self->wallpaper_texture = NULL;
}
self->wallpaper_allocation_failed = FALSE;
}
static void
invalidate_monitor_backgrounds (MetaBackground *self)
{
free_fbos (self);
g_free (self->monitors);
self->monitors = NULL;
self->n_monitors = 0;
if (self->display)
{
int i;
self->n_monitors = meta_display_get_n_monitors (self->display);
self->monitors = g_new0 (MetaBackgroundMonitor, self->n_monitors);
for (i = 0; i < self->n_monitors; i++)
self->monitors[i].dirty = TRUE;
}
}
static void
on_monitors_changed (MetaBackground *self)
{
invalidate_monitor_backgrounds (self);
}
static void
set_display (MetaBackground *self,
MetaDisplay *display)
{
g_set_object (&self->display, display);
invalidate_monitor_backgrounds (self);
}
static void
meta_background_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case PROP_META_DISPLAY:
set_display (META_BACKGROUND (object), g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_background_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MetaBackground *self = META_BACKGROUND (object);
switch (prop_id)
{
case PROP_META_DISPLAY:
g_value_set_object (value, self->display);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
need_prerender (MetaBackground *self)
{
CoglTexture *texture1 = self->background_image1 ? meta_background_image_get_texture (self->background_image1) : NULL;
CoglTexture *texture2 = self->background_image2 ? meta_background_image_get_texture (self->background_image2) : NULL;
if (texture1 == NULL && texture2 == NULL)
return FALSE;
if (texture2 == NULL && self->style == G_DESKTOP_BACKGROUND_STYLE_WALLPAPER)
return FALSE;
return TRUE;
}
static void
mark_changed (MetaBackground *self)
{
int i;
if (!need_prerender (self))
free_fbos (self);
for (i = 0; i < self->n_monitors; i++)
self->monitors[i].dirty = TRUE;
g_signal_emit (self, signals[CHANGED], 0);
}
static void
on_background_loaded (MetaBackgroundImage *image,
MetaBackground *self)
{
mark_changed (self);
}
static gboolean
file_equal0 (GFile *file1,
GFile *file2)
{
if (file1 == file2)
return TRUE;
if ((file1 == NULL) || (file2 == NULL))
return FALSE;
return g_file_equal (file1, file2);
}
static void
set_file (MetaBackground *self,
GFile **filep,
MetaBackgroundImage **imagep,
GFile *file,
gboolean force_reload)
{
if (force_reload || !file_equal0 (*filep, file))
{
if (*imagep)
{
g_signal_handlers_disconnect_by_func (*imagep,
(gpointer)on_background_loaded,
self);
g_object_unref (*imagep);
*imagep = NULL;
}
g_set_object (filep, file);
if (file)
{
MetaBackgroundImageCache *cache = meta_background_image_cache_get_default ();
*imagep = meta_background_image_cache_load (cache, file);
g_signal_connect (*imagep, "loaded",
G_CALLBACK (on_background_loaded), self);
}
}
}
static void
on_gl_video_memory_purged (MetaBackground *self)
{
MetaBackgroundImageCache *cache = meta_background_image_cache_get_default ();
/* The GPU memory that just got invalidated is the texture inside
* self->background_image1,2 and/or its mipmaps. However, to save memory the
* original pixbuf isn't kept in RAM so we can't do a simple re-upload. The
* only copy of the image was the one in texture memory that got invalidated.
* So we need to do a full reload from disk.
*/
if (self->file1)
{
meta_background_image_cache_purge (cache, self->file1);
set_file (self, &self->file1, &self->background_image1, self->file1, TRUE);
}
if (self->file2)
{
meta_background_image_cache_purge (cache, self->file2);
set_file (self, &self->file2, &self->background_image2, self->file2, TRUE);
}
mark_changed (self);
}
static void
meta_background_dispose (GObject *object)
{
MetaBackground *self = META_BACKGROUND (object);
free_color_texture (self);
free_wallpaper_texture (self);
set_file (self, &self->file1, &self->background_image1, NULL, FALSE);
set_file (self, &self->file2, &self->background_image2, NULL, FALSE);
set_display (self, NULL);
G_OBJECT_CLASS (meta_background_parent_class)->dispose (object);
}
static void
meta_background_finalize (GObject *object)
{
all_backgrounds = g_slist_remove (all_backgrounds, object);
G_OBJECT_CLASS (meta_background_parent_class)->finalize (object);
}
static void
meta_background_constructed (GObject *object)
{
MetaBackground *self = META_BACKGROUND (object);
MetaMonitorManager *monitor_manager = meta_monitor_manager_get ();
G_OBJECT_CLASS (meta_background_parent_class)->constructed (object);
g_signal_connect_object (self->display, "gl-video-memory-purged",
G_CALLBACK (on_gl_video_memory_purged), object, G_CONNECT_SWAPPED);
g_signal_connect_object (monitor_manager, "monitors-changed",
G_CALLBACK (on_monitors_changed), self,
G_CONNECT_SWAPPED);
}
static void
meta_background_class_init (MetaBackgroundClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GParamSpec *param_spec;
object_class->dispose = meta_background_dispose;
object_class->finalize = meta_background_finalize;
object_class->constructed = meta_background_constructed;
object_class->set_property = meta_background_set_property;
object_class->get_property = meta_background_get_property;
signals[CHANGED] =
g_signal_new ("changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
param_spec = g_param_spec_object ("meta-display",
"MetaDisplay",
"MetaDisplay",
META_TYPE_DISPLAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_property (object_class,
PROP_META_DISPLAY,
param_spec);
}
static void
meta_background_init (MetaBackground *self)
{
all_backgrounds = g_slist_prepend (all_backgrounds, self);
}
static void
set_texture_area_from_monitor_area (cairo_rectangle_int_t *monitor_area,
cairo_rectangle_int_t *texture_area)
{
texture_area->x = 0;
texture_area->y = 0;
texture_area->width = monitor_area->width;
texture_area->height = monitor_area->height;
}
static void
get_texture_area (MetaBackground *self,
cairo_rectangle_int_t *monitor_rect,
float monitor_scale,
CoglTexture *texture,
cairo_rectangle_int_t *texture_area)
{
cairo_rectangle_int_t image_area;
int screen_width, screen_height;
float texture_width, texture_height;
float monitor_x_scale, monitor_y_scale;
texture_width = cogl_texture_get_width (texture);
texture_height = cogl_texture_get_height (texture);
switch (self->style)
{
case G_DESKTOP_BACKGROUND_STYLE_STRETCHED:
default:
/* paint region is whole actor, and the texture
* is scaled disproportionately to fit the actor
*/
set_texture_area_from_monitor_area (monitor_rect, texture_area);
break;
case G_DESKTOP_BACKGROUND_STYLE_WALLPAPER:
meta_display_get_size (self->display, &screen_width, &screen_height);
/* Start off by centering a tile in the middle of the
* total screen area taking care of the monitor scaling.
*/
image_area.x = (screen_width - texture_width) / 2.0;
image_area.y = (screen_height - texture_height) / 2.0;
image_area.width = texture_width;
image_area.height = texture_height;
/* Translate into the coordinate system of the particular monitor */
image_area.x -= monitor_rect->x;
image_area.y -= monitor_rect->y;
*texture_area = image_area;
break;
case G_DESKTOP_BACKGROUND_STYLE_CENTERED:
/* paint region is the original image size centered in the actor,
* and the texture is scaled to the original image size */
image_area.width = texture_width;
image_area.height = texture_height;
image_area.x = monitor_rect->width / 2 - image_area.width / 2;
image_area.y = monitor_rect->height / 2 - image_area.height / 2;
*texture_area = image_area;
break;
case G_DESKTOP_BACKGROUND_STYLE_SCALED:
case G_DESKTOP_BACKGROUND_STYLE_ZOOM:
/* paint region is the actor size in one dimension, and centered and
* scaled by proportional amount in the other dimension.
*
* SCALED forces the centered dimension to fit on screen.
* ZOOM forces the centered dimension to grow off screen
*/
monitor_x_scale = monitor_rect->width / texture_width;
monitor_y_scale = monitor_rect->height / texture_height;
if ((self->style == G_DESKTOP_BACKGROUND_STYLE_SCALED &&
(monitor_x_scale < monitor_y_scale)) ||
(self->style == G_DESKTOP_BACKGROUND_STYLE_ZOOM &&
(monitor_x_scale > monitor_y_scale)))
{
/* Fill image to exactly fit actor horizontally */
image_area.width = monitor_rect->width;
image_area.height = texture_height * monitor_x_scale;
/* Position image centered vertically in actor */
image_area.x = 0;
image_area.y = monitor_rect->height / 2 - image_area.height / 2;
}
else
{
/* Scale image to exactly fit actor vertically */
image_area.width = texture_width * monitor_y_scale;
image_area.height = monitor_rect->height;
/* Position image centered horizontally in actor */
image_area.x = monitor_rect->width / 2 - image_area.width / 2;
image_area.y = 0;
}
*texture_area = image_area;
break;
case G_DESKTOP_BACKGROUND_STYLE_SPANNED:
{
/* paint region is the union of all monitors, with the origin
* of the region set to align with monitor associated with the background.
*/
meta_display_get_size (self->display, &screen_width, &screen_height);
/* unclipped texture area is whole screen, scaled depending on monitor */
image_area.width = screen_width * monitor_scale;
image_area.height = screen_height * monitor_scale;
/* But make (0,0) line up with the appropriate monitor */
image_area.x = -monitor_rect->x;
image_area.y = -monitor_rect->y;
*texture_area = image_area;
break;
}
}
}
static gboolean
draw_texture (MetaBackground *self,
CoglFramebuffer *framebuffer,
CoglPipeline *pipeline,
CoglTexture *texture,
cairo_rectangle_int_t *monitor_area,
float monitor_scale)
{
cairo_rectangle_int_t texture_area;
gboolean bare_region_visible;
get_texture_area (self, monitor_area, monitor_scale, texture, &texture_area);
switch (self->style)
{
case G_DESKTOP_BACKGROUND_STYLE_STRETCHED:
case G_DESKTOP_BACKGROUND_STYLE_WALLPAPER:
case G_DESKTOP_BACKGROUND_STYLE_ZOOM:
case G_DESKTOP_BACKGROUND_STYLE_SPANNED:
/* Draw the entire monitor */
cogl_framebuffer_draw_textured_rectangle (framebuffer,
pipeline,
0,
0,
monitor_area->width,
monitor_area->height,
- texture_area.x / (float)texture_area.width,
- texture_area.y / (float)texture_area.height,
(monitor_area->width - texture_area.x) / (float)texture_area.width,
(monitor_area->height - texture_area.y) / (float)texture_area.height);
bare_region_visible = texture_has_alpha (texture);
/* Draw just the texture */
break;
case G_DESKTOP_BACKGROUND_STYLE_CENTERED:
case G_DESKTOP_BACKGROUND_STYLE_SCALED:
cogl_framebuffer_draw_textured_rectangle (framebuffer,
pipeline,
texture_area.x, texture_area.y,
texture_area.x + texture_area.width,
texture_area.y + texture_area.height,
0, 0, 1.0, 1.0);
bare_region_visible = texture_has_alpha (texture) || memcmp (&texture_area, monitor_area, sizeof (cairo_rectangle_int_t)) != 0;
break;
case G_DESKTOP_BACKGROUND_STYLE_NONE:
bare_region_visible = TRUE;
break;
default:
g_return_val_if_reached(FALSE);
}
return bare_region_visible;
}
static void
ensure_color_texture (MetaBackground *self)
{
if (self->color_texture == NULL)
{
ClutterBackend *backend = clutter_get_default_backend ();
CoglContext *ctx = clutter_backend_get_cogl_context (backend);
GError *error = NULL;
uint8_t pixels[6];
int width, height;
if (self->shading_direction == G_DESKTOP_BACKGROUND_SHADING_SOLID)
{
width = 1;
height = 1;
pixels[0] = self->color.red;
pixels[1] = self->color.green;
pixels[2] = self->color.blue;
}
else
{
switch (self->shading_direction)
{
case G_DESKTOP_BACKGROUND_SHADING_VERTICAL:
width = 1;
height = 2;
break;
case G_DESKTOP_BACKGROUND_SHADING_HORIZONTAL:
width = 2;
height = 1;
break;
default:
g_return_if_reached ();
}
pixels[0] = self->color.red;
pixels[1] = self->color.green;
pixels[2] = self->color.blue;
pixels[3] = self->second_color.red;
pixels[4] = self->second_color.green;
pixels[5] = self->second_color.blue;
}
self->color_texture = COGL_TEXTURE (cogl_texture_2d_new_from_data (ctx, width, height,
COGL_PIXEL_FORMAT_RGB_888,
width * 3,
pixels,
&error));
if (error != NULL)
{
meta_warning ("Failed to allocate color texture: %s\n", error->message);
g_error_free (error);
}
}
}
typedef enum
{
PIPELINE_REPLACE,
PIPELINE_ADD,
PIPELINE_OVER_REVERSE,
} PipelineType;
static CoglPipeline *
create_pipeline (PipelineType type)
{
const char * const blend_strings[3] = {
[PIPELINE_REPLACE] = "RGBA = ADD (SRC_COLOR, 0)",
[PIPELINE_ADD] = "RGBA = ADD (SRC_COLOR, DST_COLOR)",
[PIPELINE_OVER_REVERSE] = "RGBA = ADD (SRC_COLOR * (1 - DST_COLOR[A]), DST_COLOR)",
};
static CoglPipeline *templates[3];
if (templates[type] == NULL)
{
templates[type] = meta_create_texture_pipeline (NULL);
cogl_pipeline_set_blend (templates[type], blend_strings[type], NULL);
}
cogl_pipeline_set_layer_filters (templates[type],
0,
COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR,
COGL_PIPELINE_FILTER_LINEAR);
return cogl_pipeline_copy (templates[type]);
}
static gboolean
texture_has_alpha (CoglTexture *texture)
{
if (!texture)
return FALSE;
switch (cogl_texture_get_components (texture))
{
case COGL_TEXTURE_COMPONENTS_A:
case COGL_TEXTURE_COMPONENTS_RGBA:
return TRUE;
case COGL_TEXTURE_COMPONENTS_RG:
case COGL_TEXTURE_COMPONENTS_RGB:
case COGL_TEXTURE_COMPONENTS_DEPTH:
return FALSE;
default:
g_assert_not_reached ();
return FALSE;
}
}
static gboolean
ensure_wallpaper_texture (MetaBackground *self,
CoglTexture *texture)
{
if (self->wallpaper_texture == NULL && !self->wallpaper_allocation_failed)
{
int width = cogl_texture_get_width (texture);
int height = cogl_texture_get_height (texture);
CoglOffscreen *offscreen;
CoglFramebuffer *fbo;
GError *catch_error = NULL;
CoglPipeline *pipeline;
self->wallpaper_texture = meta_create_texture (width, height,
COGL_TEXTURE_COMPONENTS_RGBA,
META_TEXTURE_FLAGS_NONE);
offscreen = cogl_offscreen_new_with_texture (self->wallpaper_texture);
fbo = COGL_FRAMEBUFFER (offscreen);
if (!cogl_framebuffer_allocate (fbo, &catch_error))
{
/* This probably means that the size of the wallpapered texture is larger
* than the maximum texture size; we treat it as permanent until the
* background is changed again.
*/
g_error_free (catch_error);
cogl_object_unref (self->wallpaper_texture);
self->wallpaper_texture = NULL;
cogl_object_unref (fbo);
self->wallpaper_allocation_failed = TRUE;
return FALSE;
}
cogl_framebuffer_orthographic (fbo, 0, 0,
width, height, -1., 1.);
pipeline = create_pipeline (PIPELINE_REPLACE);
cogl_pipeline_set_layer_texture (pipeline, 0, texture);
cogl_framebuffer_draw_textured_rectangle (fbo, pipeline, 0, 0, width, height,
0., 0., 1., 1.);
cogl_object_unref (pipeline);
if (texture_has_alpha (texture))
{
ensure_color_texture (self);
pipeline = create_pipeline (PIPELINE_OVER_REVERSE);
cogl_pipeline_set_layer_texture (pipeline, 0, self->color_texture);
cogl_framebuffer_draw_rectangle (fbo, pipeline, 0, 0, width, height);
cogl_object_unref (pipeline);
}
cogl_object_unref (fbo);
}
return self->wallpaper_texture != NULL;
}
static CoglPipelineWrapMode
get_wrap_mode (GDesktopBackgroundStyle style)
{
switch (style)
{
case G_DESKTOP_BACKGROUND_STYLE_WALLPAPER:
return COGL_PIPELINE_WRAP_MODE_REPEAT;
case G_DESKTOP_BACKGROUND_STYLE_NONE:
case G_DESKTOP_BACKGROUND_STYLE_STRETCHED:
case G_DESKTOP_BACKGROUND_STYLE_CENTERED:
case G_DESKTOP_BACKGROUND_STYLE_SCALED:
case G_DESKTOP_BACKGROUND_STYLE_ZOOM:
case G_DESKTOP_BACKGROUND_STYLE_SPANNED:
default:
return COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
}
}
static int
get_best_mipmap_level (CoglTexture *texture,
int visible_width,
int visible_height)
{
int mipmap_width = cogl_texture_get_width (texture);
int mipmap_height = cogl_texture_get_height (texture);
int halves = 0;
while (mipmap_width >= visible_width && mipmap_height >= visible_height)
{
halves++;
mipmap_width /= 2;
mipmap_height /= 2;
}
return MAX (0, halves - 1);
}
CoglTexture *
meta_background_get_texture (MetaBackground *self,
int monitor_index,
cairo_rectangle_int_t *texture_area,
CoglPipelineWrapMode *wrap_mode)
{
MetaBackgroundMonitor *monitor;
MetaRectangle geometry;
cairo_rectangle_int_t monitor_area;
CoglTexture *texture1, *texture2;
float monitor_scale;
g_return_val_if_fail (META_IS_BACKGROUND (self), NULL);
g_return_val_if_fail (monitor_index >= 0 && monitor_index < self->n_monitors, NULL);
monitor = &self->monitors[monitor_index];
meta_display_get_monitor_geometry (self->display, monitor_index, &geometry);
monitor_scale = meta_display_get_monitor_scale (self->display, monitor_index);
monitor_area.x = geometry.x;
monitor_area.y = geometry.y;
monitor_area.width = geometry.width;
monitor_area.height = geometry.height;
texture1 = self->background_image1 ? meta_background_image_get_texture (self->background_image1) : NULL;
texture2 = self->background_image2 ? meta_background_image_get_texture (self->background_image2) : NULL;
if (texture1 == NULL && texture2 == NULL)
{
ensure_color_texture (self);
if (texture_area)
set_texture_area_from_monitor_area (&monitor_area, texture_area);
if (wrap_mode)
*wrap_mode = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
return self->color_texture;
}
if (texture2 == NULL && self->style == G_DESKTOP_BACKGROUND_STYLE_WALLPAPER &&
self->shading_direction == G_DESKTOP_BACKGROUND_SHADING_SOLID &&
ensure_wallpaper_texture (self, texture1))
{
if (texture_area)
get_texture_area (self, &monitor_area, monitor_scale,
self->wallpaper_texture, texture_area);
if (wrap_mode)
*wrap_mode = COGL_PIPELINE_WRAP_MODE_REPEAT;
return self->wallpaper_texture;
}
if (monitor->dirty)
{
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)
{
monitor_area.x *= monitor_scale;
monitor_area.y *= monitor_scale;
monitor_area.width *= monitor_scale;
monitor_area.height *= monitor_scale;
}
if (!cogl_framebuffer_allocate (monitor->fbo, &catch_error))
{
/* Texture or framebuffer allocation failed; it's unclear why this happened;
* we'll try again the next time this is called. (MetaBackgroundActor
* caches the result, so user might be left without a background.)
*/
cogl_object_unref (monitor->texture);
monitor->texture = NULL;
cogl_object_unref (monitor->fbo);
monitor->fbo = NULL;
g_error_free (catch_error);
return NULL;
}
cogl_framebuffer_orthographic (monitor->fbo, 0, 0,
monitor_area.width, monitor_area.height, -1., 1.);
if (texture2 != NULL && self->blend_factor != 0.0)
{
CoglPipeline *pipeline = create_pipeline (PIPELINE_REPLACE);
int mipmap_level;
mipmap_level = get_best_mipmap_level (texture2,
texture_width,
texture_height);
cogl_pipeline_set_color4f (pipeline,
self->blend_factor, self->blend_factor, self->blend_factor, self->blend_factor);
cogl_pipeline_set_layer_texture (pipeline, 0, texture2);
cogl_pipeline_set_layer_wrap_mode (pipeline, 0, get_wrap_mode (self->style));
cogl_pipeline_set_layer_max_mipmap_level (pipeline, 0, mipmap_level);
bare_region_visible = draw_texture (self,
monitor->fbo, pipeline,
texture2, &monitor_area,
monitor_scale);
cogl_object_unref (pipeline);
}
else
{
cogl_framebuffer_clear4f (monitor->fbo,
COGL_BUFFER_BIT_COLOR,
0.0, 0.0, 0.0, 0.0);
}
if (texture1 != NULL && self->blend_factor != 1.0)
{
CoglPipeline *pipeline = create_pipeline (PIPELINE_ADD);
int mipmap_level;
mipmap_level = get_best_mipmap_level (texture1,
texture_width,
texture_height);
cogl_pipeline_set_color4f (pipeline,
(1 - self->blend_factor),
(1 - self->blend_factor),
(1 - self->blend_factor),
(1 - self->blend_factor));;
cogl_pipeline_set_layer_texture (pipeline, 0, texture1);
cogl_pipeline_set_layer_wrap_mode (pipeline, 0, get_wrap_mode (self->style));
cogl_pipeline_set_layer_max_mipmap_level (pipeline, 0, mipmap_level);
bare_region_visible = bare_region_visible || draw_texture (self,
monitor->fbo, pipeline,
texture1, &monitor_area,
monitor_scale);
cogl_object_unref (pipeline);
}
if (bare_region_visible)
{
CoglPipeline *pipeline = create_pipeline (PIPELINE_OVER_REVERSE);
ensure_color_texture (self);
cogl_pipeline_set_layer_texture (pipeline, 0, self->color_texture);
cogl_framebuffer_draw_rectangle (monitor->fbo,
pipeline,
0, 0,
monitor_area.width, monitor_area.height);
cogl_object_unref (pipeline);
}
monitor->dirty = FALSE;
}
if (texture_area)
set_texture_area_from_monitor_area (&geometry, texture_area);
if (wrap_mode)
*wrap_mode = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
return monitor->texture;
}
MetaBackground *
meta_background_new (MetaDisplay *display)
{
return g_object_new (META_TYPE_BACKGROUND,
"meta-display", display,
NULL);
}
void
meta_background_set_color (MetaBackground *self,
ClutterColor *color)
{
ClutterColor dummy = { 0 };
g_return_if_fail (META_IS_BACKGROUND (self));
g_return_if_fail (color != NULL);
meta_background_set_gradient (self,
G_DESKTOP_BACKGROUND_SHADING_SOLID,
color, &dummy);
}
void
meta_background_set_gradient (MetaBackground *self,
GDesktopBackgroundShading shading_direction,
ClutterColor *color,
ClutterColor *second_color)
{
g_return_if_fail (META_IS_BACKGROUND (self));
g_return_if_fail (color != NULL);
g_return_if_fail (second_color != NULL);
self->shading_direction = shading_direction;
self->color = *color;
self->second_color = *second_color;
free_color_texture (self);
free_wallpaper_texture (self);
mark_changed (self);
}
/**
* meta_background_set_file:
* @self: a #MetaBackground
* @file: (nullable): a #GFile representing the background file
* @style: the background style to apply
*
* Set the background to @file
*/
void
meta_background_set_file (MetaBackground *self,
GFile *file,
GDesktopBackgroundStyle style)
{
g_return_if_fail (META_IS_BACKGROUND (self));
meta_background_set_blend (self, file, NULL, 0.0, style);
}
void
meta_background_set_blend (MetaBackground *self,
GFile *file1,
GFile *file2,
double blend_factor,
GDesktopBackgroundStyle style)
{
g_return_if_fail (META_IS_BACKGROUND (self));
g_return_if_fail (blend_factor >= 0.0 && blend_factor <= 1.0);
set_file (self, &self->file1, &self->background_image1, file1, FALSE);
set_file (self, &self->file2, &self->background_image2, file2, FALSE);
self->blend_factor = blend_factor;
self->style = style;
free_wallpaper_texture (self);
mark_changed (self);
}
void
meta_background_refresh_all (void)
{
GSList *l;
for (l = all_backgrounds; l; l = l->next)
mark_changed (l->data);
}
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