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mutter/src/compositor/meta-background-content.c
Jonas Dreßler 5527b6e483 background-content: Add support for rounded clipping when drawing 
We're going to round the workspace backgrounds in the new overview for
gnome-shell 40.

So far corner-rounding was only possible for StWidgets because the
rounded clipping was done using cairo drawing. We now need rounded
clipping for ClutterActors too because backgrounds are drawn using
ClutterActors (or more specifically a ClutterContent). To implement
that, first a ClutterOffscreenEffect subclass together with a fragment
shader from GSK (see gskSetOutputColor() [1] in the GSK GL renderer
code) was investigated, and while that was generic and worked quite
well, it was extremely slow for the case of drawing wallpapers because
of all the FBOs that had to be allocated.

This is the new, more performant approach: Use the same fragment shader,
but perform the rounded clipping right in MetaBackgroundContent while
we're painting the wallpaper. This has almost no performance impact,
with the downside of not being a generic solution.

To allow for rounded clipping not only at the edges of the wallpaper,
but using any given bounding rectangle, the API exposes not only the
radius, but also a bounding rect.

[1] https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gsk/resources/glsl/preamble.fs.glsl

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1717>
2021-02-18 20:26:42 +00:00

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/*
* Copyright 2009 Sander Dijkhuis
* Copyright 2014 Red Hat, Inc.
* Copyright 2020 Endless Foundation.
*
* 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/>.
*
* Portions adapted from gnome-shell/src/shell-global.c
*/
/**
* SECTION:meta-background-content
* @title: MetaBackgroundContent
* @short_description: ClutterContent for painting the root window background
*
*/
/*
* The overall model drawing model of this content is that we have one
* texture, or two interpolated textures, possibly with alpha or
* margins that let the underlying background show through, blended
* over a solid color or a gradient. The result of that combination
* can then be affected by a "vignette" that darkens the background
* away from a central point (or as a no-GLSL fallback, simply darkens
* the background) and by overall opacity.
*
* As of GNOME 3.14, GNOME is only using a fraction of this when the
* user sets the background through the control center - what can be
* set is:
*
* A single image without a border
* An animation of images without a border that blend together,
* with the blend changing every 4-5 minutes
* A solid color with a repeated noise texture blended over it
*
* This all is pretty easy to do in a fragment shader, except when:
*
* A) We don't have GLSL - in this case, the operation of
* interpolating the two textures and blending the result over the
* background can't be expressed with Cogl's fixed-function layer
* combining (which is confined to what GL's texture environment
* combining can do) So we can only handle the above directly if
* there are no margins or alpha.
*
* B) The image textures are sliced. Texture size limits on older
* hardware (pre-965 intel hardware, r300, etc.) is often 2048,
* and it would be common to use a texture larger than this for a
* background and expect it to be scaled down. Cogl can compensate
* for this by breaking the texture up into multiple textures, but
* can't multitexture with sliced textures. So we can only handle
* the above if there's a single texture.
*
* However, even when we *can* represent everything in a single pass,
* it's not necessarily efficient. If we want to draw a 1024x768
* background, it's pretty inefficient to bilinearly texture from
* two 2560x1440 images and mix that. So the drawing model we take
* here is that MetaBackground generates a single texture (which
* might be a 1x1 texture for a solid color, or a 1x2 texture for a
* gradient, or a repeated texture for wallpaper, or a pre-rendered
* texture the size of the screen), and we draw with that, possibly
* adding the vignette and opacity.
*/
#include "config.h"
#include "compositor/meta-background-content-private.h"
#include "backends/meta-backend-private.h"
#include "clutter/clutter.h"
#include "compositor/clutter-utils.h"
#include "compositor/cogl-utils.h"
#include "compositor/meta-background-private.h"
#include "compositor/meta-cullable.h"
#include "meta/display.h"
typedef enum
{
CHANGED_BACKGROUND = 1 << 0,
CHANGED_EFFECTS = 1 << 2,
CHANGED_VIGNETTE_PARAMETERS = 1 << 3,
CHANGED_GRADIENT_PARAMETERS = 1 << 4,
CHANGED_ROUNDED_CLIP_PARAMETERS = 1 << 5,
CHANGED_ALL = 0xFFFF
} ChangedFlags;
#define GRADIENT_VERTEX_SHADER_DECLARATIONS \
"uniform vec2 scale;\n" \
"varying vec2 position;\n" \
#define GRADIENT_VERTEX_SHADER_CODE \
"position = cogl_tex_coord0_in.xy * scale;\n" \
#define GRADIENT_FRAGMENT_SHADER_DECLARATIONS \
"uniform float gradient_height_perc;\n" \
"uniform float gradient_max_darkness;\n" \
"varying vec2 position;\n" \
#define GRADIENT_FRAGMENT_SHADER_CODE \
"float min_brightness = 1.0 - gradient_max_darkness;\n" \
"float gradient_y_pos = min(position.y, gradient_height_perc) / gradient_height_perc;\n" \
"float pixel_brightness = (1.0 - min_brightness) * gradient_y_pos + min_brightness;\n" \
"cogl_color_out.rgb = cogl_color_out.rgb * pixel_brightness;\n" \
#define VIGNETTE_VERTEX_SHADER_DECLARATIONS \
"uniform vec2 scale;\n" \
"uniform vec2 offset;\n" \
"varying vec2 position;\n" \
#define VIGNETTE_VERTEX_SHADER_CODE \
"position = cogl_tex_coord0_in.xy * scale + offset;\n" \
#define VIGNETTE_SQRT_2 "1.4142"
#define VIGNETTE_FRAGMENT_SHADER_DECLARATIONS \
"uniform float vignette_sharpness;\n" \
"varying vec2 position;\n" \
"float rand(vec2 p) { return fract(sin(dot(p, vec2(12.9898, 78.233))) * 43758.5453123); }\n" \
#define VIGNETTE_FRAGMENT_SHADER_CODE \
"float t = " VIGNETTE_SQRT_2 " * length(position);\n" \
"t = min(t, 1.0);\n" \
"float pixel_brightness = 1.0 - t * vignette_sharpness;\n" \
"cogl_color_out.rgb = cogl_color_out.rgb * pixel_brightness;\n" \
"cogl_color_out.rgb += (rand(position) - 0.5) / 255.0;\n" \
/* The ellipsis_dist(), ellipsis_coverage() and rounded_rect_coverage() are
* copied from GSK, see gsk_ellipsis_dist(), gsk_ellipsis_coverage(), and
* gsk_rounded_rect_coverage() here:
* https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gsk/resources/glsl/preamble.fs.glsl
*/
#define ROUNDED_CLIP_FRAGMENT_SHADER_DECLARATIONS \
"uniform vec4 bounds; // x, y: top left; w, v: bottom right \n"\
"uniform vec4 corner_centers_1; // x, y: top left; w, v: top right \n"\
"uniform vec4 corner_centers_2; // x, y: bottom right; w, v: bottom left \n"\
"uniform vec2 pixel_step; \n"\
" \n"\
"float \n"\
"ellipsis_dist (vec2 p, vec2 radius) \n"\
"{ \n"\
" if (radius == vec2(0, 0)) \n"\
" return 0.0; \n"\
" \n"\
" vec2 p0 = p / radius; \n"\
" vec2 p1 = (2.0 * p0) / radius; \n"\
" \n"\
" return (dot(p0, p0) - 1.0) / length (p1); \n"\
"} \n"\
" \n"\
"float \n"\
"ellipsis_coverage (vec2 point, vec2 center, vec2 radius) \n"\
"{ \n"\
" float d = ellipsis_dist ((point - center), radius); \n"\
" return clamp (0.5 - d, 0.0, 1.0); \n"\
"} \n"\
" \n"\
"float \n"\
"rounded_rect_coverage (vec4 bounds, \n"\
" vec4 corner_centers_1, \n"\
" vec4 corner_centers_2, \n"\
" vec2 p) \n"\
"{ \n"\
" if (p.x < bounds.x || p.y < bounds.y || \n"\
" p.x >= bounds.z || p.y >= bounds.w) \n"\
" return 0.0; \n"\
" \n"\
" vec2 rad_tl = corner_centers_1.xy - bounds.xy; \n"\
" vec2 rad_tr = corner_centers_1.zw - bounds.zy; \n"\
" vec2 rad_br = corner_centers_2.xy - bounds.zw; \n"\
" vec2 rad_bl = corner_centers_2.zw - bounds.xw; \n"\
" \n"\
" vec2 ref_tl = corner_centers_1.xy; \n"\
" vec2 ref_tr = corner_centers_1.zw; \n"\
" vec2 ref_br = corner_centers_2.xy; \n"\
" vec2 ref_bl = corner_centers_2.zw; \n"\
" \n"\
" float d_tl = ellipsis_coverage(p, ref_tl, rad_tl); \n"\
" float d_tr = ellipsis_coverage(p, ref_tr, rad_tr); \n"\
" float d_br = ellipsis_coverage(p, ref_br, rad_br); \n"\
" float d_bl = ellipsis_coverage(p, ref_bl, rad_bl); \n"\
" \n"\
" vec4 corner_coverages = 1.0 - vec4(d_tl, d_tr, d_br, d_bl); \n"\
" \n"\
" bvec4 is_out = bvec4(p.x < ref_tl.x && p.y < ref_tl.y, \n"\
" p.x > ref_tr.x && p.y < ref_tr.y, \n"\
" p.x > ref_br.x && p.y > ref_br.y, \n"\
" p.x < ref_bl.x && p.y > ref_bl.y); \n"\
" \n"\
" return 1.0 - dot(vec4(is_out), corner_coverages); \n"\
"} \n"
#define ROUNDED_CLIP_FRAGMENT_SHADER_CODE \
"vec2 texture_coord; \n"\
" \n"\
"texture_coord = cogl_tex_coord0_in.xy / pixel_step; \n"\
" \n"\
"cogl_color_out *= rounded_rect_coverage (bounds, \n"\
" corner_centers_1, \n"\
" corner_centers_2, \n"\
" texture_coord); \n"
typedef struct _MetaBackgroundLayer MetaBackgroundLayer;
typedef enum
{
PIPELINE_VIGNETTE = (1 << 0),
PIPELINE_BLEND = (1 << 1),
PIPELINE_GRADIENT = (1 << 2),
PIPELINE_ROUNDED_CLIP = (1 << 3),
} PipelineFlags;
struct _MetaBackgroundContent
{
GObject parent;
MetaDisplay *display;
int monitor;
MetaBackground *background;
gboolean gradient;
double gradient_max_darkness;
int gradient_height;
gboolean vignette;
double vignette_brightness;
double vignette_sharpness;
gboolean has_rounded_clip;
float rounded_clip_radius;
gboolean rounded_clip_bounds_set;
graphene_rect_t rounded_clip_bounds;
ChangedFlags changed;
CoglPipeline *pipeline;
PipelineFlags pipeline_flags;
cairo_rectangle_int_t texture_area;
int texture_width, texture_height;
cairo_region_t *clip_region;
cairo_region_t *unobscured_region;
};
static void clutter_content_iface_init (ClutterContentInterface *iface);
G_DEFINE_TYPE_WITH_CODE (MetaBackgroundContent,
meta_background_content,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_CONTENT,
clutter_content_iface_init));
enum
{
PROP_0,
PROP_META_DISPLAY,
PROP_MONITOR,
PROP_BACKGROUND,
PROP_GRADIENT,
PROP_GRADIENT_HEIGHT,
PROP_GRADIENT_MAX_DARKNESS,
PROP_VIGNETTE,
PROP_VIGNETTE_SHARPNESS,
PROP_VIGNETTE_BRIGHTNESS,
PROP_ROUNDED_CLIP_RADIUS,
N_PROPS,
};
static GParamSpec *properties[N_PROPS] = { NULL, };
static void
set_clip_region (MetaBackgroundContent *self,
cairo_region_t *clip_region)
{
g_clear_pointer (&self->clip_region, cairo_region_destroy);
if (clip_region)
{
if (cairo_region_is_empty (clip_region))
self->clip_region = cairo_region_reference (clip_region);
else
self->clip_region = cairo_region_copy (clip_region);
}
}
static void
set_unobscured_region (MetaBackgroundContent *self,
cairo_region_t *unobscured_region)
{
g_clear_pointer (&self->unobscured_region, cairo_region_destroy);
if (unobscured_region)
{
if (cairo_region_is_empty (unobscured_region))
self->unobscured_region = cairo_region_reference (unobscured_region);
else
self->unobscured_region = cairo_region_copy (unobscured_region);
}
}
static void
invalidate_pipeline (MetaBackgroundContent *self,
ChangedFlags changed)
{
self->changed |= changed;
}
static void
on_background_changed (MetaBackground *background,
MetaBackgroundContent *self)
{
invalidate_pipeline (self, CHANGED_BACKGROUND);
clutter_content_invalidate (CLUTTER_CONTENT (self));
}
static CoglPipeline *
make_pipeline (PipelineFlags pipeline_flags)
{
static CoglPipeline *templates[9];
CoglPipeline **templatep;
templatep = &templates[pipeline_flags];
if (*templatep == NULL)
{
/* Cogl automatically caches pipelines with no eviction policy,
* so we need to prevent identical pipelines from getting cached
* separately, by reusing the same shader snippets.
*/
*templatep = COGL_PIPELINE (meta_create_texture_pipeline (NULL));
if ((pipeline_flags & PIPELINE_VIGNETTE) != 0)
{
static CoglSnippet *vignette_vertex_snippet;
static CoglSnippet *vignette_fragment_snippet;
if (!vignette_vertex_snippet)
vignette_vertex_snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_VERTEX,
VIGNETTE_VERTEX_SHADER_DECLARATIONS,
VIGNETTE_VERTEX_SHADER_CODE);
cogl_pipeline_add_snippet (*templatep, vignette_vertex_snippet);
if (!vignette_fragment_snippet)
vignette_fragment_snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
VIGNETTE_FRAGMENT_SHADER_DECLARATIONS,
VIGNETTE_FRAGMENT_SHADER_CODE);
cogl_pipeline_add_snippet (*templatep, vignette_fragment_snippet);
}
if ((pipeline_flags & PIPELINE_GRADIENT) != 0)
{
static CoglSnippet *gradient_vertex_snippet;
static CoglSnippet *gradient_fragment_snippet;
if (!gradient_vertex_snippet)
gradient_vertex_snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_VERTEX,
GRADIENT_VERTEX_SHADER_DECLARATIONS,
GRADIENT_VERTEX_SHADER_CODE);
cogl_pipeline_add_snippet (*templatep, gradient_vertex_snippet);
if (!gradient_fragment_snippet)
gradient_fragment_snippet = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
GRADIENT_FRAGMENT_SHADER_DECLARATIONS,
GRADIENT_FRAGMENT_SHADER_CODE);
cogl_pipeline_add_snippet (*templatep, gradient_fragment_snippet);
}
if ((pipeline_flags & PIPELINE_ROUNDED_CLIP) != 0)
{
static CoglSnippet *rounded_clip_fragment_snippet;
if (!rounded_clip_fragment_snippet)
{
rounded_clip_fragment_snippet =
cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT,
ROUNDED_CLIP_FRAGMENT_SHADER_DECLARATIONS,
ROUNDED_CLIP_FRAGMENT_SHADER_CODE);
}
cogl_pipeline_add_snippet (*templatep, rounded_clip_fragment_snippet);
}
if ((pipeline_flags & PIPELINE_BLEND) == 0)
cogl_pipeline_set_blend (*templatep, "RGBA = ADD (SRC_COLOR, 0)", NULL);
}
return cogl_pipeline_copy (*templatep);
}
static void
setup_pipeline (MetaBackgroundContent *self,
ClutterActor *actor,
ClutterPaintContext *paint_context,
cairo_rectangle_int_t *actor_pixel_rect)
{
PipelineFlags pipeline_flags = 0;
guint8 opacity;
float color_component;
CoglFramebuffer *fb;
CoglPipelineFilter min_filter, mag_filter;
opacity = clutter_actor_get_paint_opacity (actor);
if (opacity < 255)
pipeline_flags |= PIPELINE_BLEND;
if (self->vignette && clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
pipeline_flags |= PIPELINE_VIGNETTE;
if (self->gradient && clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
pipeline_flags |= PIPELINE_GRADIENT;
if (self->has_rounded_clip && clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
pipeline_flags |= PIPELINE_ROUNDED_CLIP | PIPELINE_BLEND;
if (pipeline_flags != self->pipeline_flags)
g_clear_pointer (&self->pipeline, cogl_object_unref);
if (self->pipeline == NULL)
{
self->pipeline_flags = pipeline_flags;
self->pipeline = make_pipeline (pipeline_flags);
self->changed = CHANGED_ALL;
}
if (self->changed & CHANGED_BACKGROUND)
{
CoglPipelineWrapMode wrap_mode;
CoglTexture *texture = meta_background_get_texture (self->background,
self->monitor,
&self->texture_area,
&wrap_mode);
if (texture)
{
self->texture_width = cogl_texture_get_width (texture);
self->texture_height = cogl_texture_get_height (texture);
}
else
{
self->texture_width = 0;
self->texture_height = 0;
}
cogl_pipeline_set_layer_texture (self->pipeline, 0, texture);
cogl_pipeline_set_layer_wrap_mode (self->pipeline, 0, wrap_mode);
self->changed &= ~CHANGED_BACKGROUND;
}
if (self->changed & CHANGED_VIGNETTE_PARAMETERS)
{
cogl_pipeline_set_uniform_1f (self->pipeline,
cogl_pipeline_get_uniform_location (self->pipeline,
"vignette_sharpness"),
self->vignette_sharpness);
self->changed &= ~CHANGED_VIGNETTE_PARAMETERS;
}
if (self->changed & CHANGED_GRADIENT_PARAMETERS)
{
MetaRectangle monitor_geometry;
float gradient_height_perc;
meta_display_get_monitor_geometry (self->display,
self->monitor, &monitor_geometry);
gradient_height_perc = MAX (0.0001, self->gradient_height / (float)monitor_geometry.height);
cogl_pipeline_set_uniform_1f (self->pipeline,
cogl_pipeline_get_uniform_location (self->pipeline,
"gradient_height_perc"),
gradient_height_perc);
cogl_pipeline_set_uniform_1f (self->pipeline,
cogl_pipeline_get_uniform_location (self->pipeline,
"gradient_max_darkness"),
self->gradient_max_darkness);
self->changed &= ~CHANGED_GRADIENT_PARAMETERS;
}
if (self->changed & CHANGED_ROUNDED_CLIP_PARAMETERS)
{
float monitor_scale;
float bounds_x1, bounds_x2, bounds_y1, bounds_y2;
float clip_radius;
monitor_scale = meta_is_stage_views_scaled ()
? meta_display_get_monitor_scale (self->display, self->monitor)
: 1.0;
if (self->rounded_clip_bounds_set)
{
bounds_x1 = self->rounded_clip_bounds.origin.x;
bounds_x2 = self->rounded_clip_bounds.origin.x + self->rounded_clip_bounds.size.width;
bounds_y1 = self->rounded_clip_bounds.origin.y;
bounds_y2 = self->rounded_clip_bounds.origin.y + self->rounded_clip_bounds.size.height;
bounds_x1 *= monitor_scale;
bounds_x2 *= monitor_scale;
bounds_y1 *= monitor_scale;
bounds_y2 *= monitor_scale;
}
else
{
bounds_x1 = 0.0;
bounds_x2 = self->texture_width;
bounds_y1 = 0.0;
bounds_y2 = self->texture_height;
}
clip_radius = self->rounded_clip_radius * monitor_scale;
float bounds[] = {
bounds_x1,
bounds_y1,
bounds_x2,
bounds_y2,
};
float corner_centers_1[] = {
bounds_x1 + clip_radius,
bounds_y1 + clip_radius,
bounds_x2 - clip_radius,
bounds_y1 + clip_radius,
};
float corner_centers_2[] = {
bounds_x2 - clip_radius,
bounds_y2 - clip_radius,
bounds_x1 + clip_radius,
bounds_y2 - clip_radius,
};
int bounds_uniform_location;
int corner_centers_1_uniform_location;
int corner_centers_2_uniform_location;
bounds_uniform_location =
cogl_pipeline_get_uniform_location (self->pipeline, "bounds");
corner_centers_1_uniform_location =
cogl_pipeline_get_uniform_location (self->pipeline, "corner_centers_1");
corner_centers_2_uniform_location =
cogl_pipeline_get_uniform_location (self->pipeline, "corner_centers_2");
cogl_pipeline_set_uniform_float (self->pipeline,
bounds_uniform_location,
4, 1,
bounds);
cogl_pipeline_set_uniform_float (self->pipeline,
corner_centers_1_uniform_location,
4, 1,
corner_centers_1);
cogl_pipeline_set_uniform_float (self->pipeline,
corner_centers_2_uniform_location,
4, 1,
corner_centers_2);
self->changed &= ~CHANGED_ROUNDED_CLIP_PARAMETERS;
}
if (self->vignette)
{
color_component = self->vignette_brightness * opacity / 255.;
if (!clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
{
/* Darken everything to match the average brightness that would
* be there if we were drawing the vignette, which is
* (1 - (pi/12.) * vignette_sharpness) [exercise for the reader :]
*/
color_component *= (1 - 0.74 * self->vignette_sharpness);
}
}
else
{
color_component = opacity / 255.;
}
cogl_pipeline_set_color4f (self->pipeline,
color_component,
color_component,
color_component,
opacity / 255.);
fb = clutter_paint_context_get_framebuffer (paint_context);
if (meta_actor_painting_untransformed (fb,
actor_pixel_rect->width,
actor_pixel_rect->height,
self->texture_width,
self->texture_height,
NULL, NULL))
{
min_filter = COGL_PIPELINE_FILTER_NEAREST;
mag_filter = COGL_PIPELINE_FILTER_NEAREST;
}
else
{
min_filter = COGL_PIPELINE_FILTER_LINEAR_MIPMAP_NEAREST;
mag_filter = COGL_PIPELINE_FILTER_LINEAR;
}
cogl_pipeline_set_layer_filters (self->pipeline, 0, min_filter, mag_filter);
}
static void
set_glsl_parameters (MetaBackgroundContent *self,
cairo_rectangle_int_t *actor_pixel_rect)
{
float monitor_scale;
float scale[2];
float offset[2];
int pixel_step_uniform_location;
monitor_scale = meta_is_stage_views_scaled ()
? meta_display_get_monitor_scale (self->display, self->monitor)
: 1.0;
float pixel_step[] = {
1.f / (self->texture_area.width * monitor_scale),
1.f / (self->texture_area.height * monitor_scale),
};
pixel_step_uniform_location =
cogl_pipeline_get_uniform_location (self->pipeline,
"pixel_step");
/* Compute a scale and offset for transforming texture coordinates to the
* coordinate system from [-0.5 to 0.5] across the area of the actor
*/
scale[0] = self->texture_area.width / (float)actor_pixel_rect->width;
scale[1] = self->texture_area.height / (float)actor_pixel_rect->height;
offset[0] = self->texture_area.x / (float)actor_pixel_rect->width - 0.5;
offset[1] = self->texture_area.y / (float)actor_pixel_rect->height - 0.5;
cogl_pipeline_set_uniform_float (self->pipeline,
cogl_pipeline_get_uniform_location (self->pipeline,
"scale"),
2, 1, scale);
cogl_pipeline_set_uniform_float (self->pipeline,
cogl_pipeline_get_uniform_location (self->pipeline,
"offset"),
2, 1, offset);
cogl_pipeline_set_uniform_float (self->pipeline,
pixel_step_uniform_location,
2, 1,
pixel_step);
}
static void
paint_clipped_rectangle (MetaBackgroundContent *self,
ClutterPaintNode *node,
ClutterActorBox *actor_box,
cairo_rectangle_int_t *rect)
{
g_autoptr (ClutterPaintNode) pipeline_node = NULL;
float h_scale, v_scale;
float x1, y1, x2, y2;
float tx1, ty1, tx2, ty2;
h_scale = self->texture_area.width / clutter_actor_box_get_width (actor_box);
v_scale = self->texture_area.height / clutter_actor_box_get_height (actor_box);
x1 = rect->x;
y1 = rect->y;
x2 = rect->x + rect->width;
y2 = rect->y + rect->height;
tx1 = (x1 * h_scale - self->texture_area.x) / (float)self->texture_area.width;
ty1 = (y1 * v_scale - self->texture_area.y) / (float)self->texture_area.height;
tx2 = (x2 * h_scale - self->texture_area.x) / (float)self->texture_area.width;
ty2 = (y2 * v_scale - self->texture_area.y) / (float)self->texture_area.height;
pipeline_node = clutter_pipeline_node_new (self->pipeline);
clutter_paint_node_set_name (pipeline_node, "MetaBackgroundContent (Slice)");
clutter_paint_node_add_texture_rectangle (pipeline_node,
&(ClutterActorBox) {
.x1 = x1,
.y1 = y1,
.x2 = x2,
.y2 = y2,
},
tx1, ty1,
tx2, ty2);
clutter_paint_node_add_child (node, pipeline_node);
}
static void
meta_background_content_paint_content (ClutterContent *content,
ClutterActor *actor,
ClutterPaintNode *node,
ClutterPaintContext *paint_context)
{
MetaBackgroundContent *self = META_BACKGROUND_CONTENT (content);
ClutterActorBox actor_box;
cairo_rectangle_int_t rect_within_actor;
cairo_rectangle_int_t rect_within_stage;
cairo_region_t *region;
int i, n_rects;
float transformed_x, transformed_y, transformed_width, transformed_height;
gboolean untransformed;
if ((self->clip_region && cairo_region_is_empty (self->clip_region)))
return;
clutter_actor_get_content_box (actor, &actor_box);
rect_within_actor.x = actor_box.x1;
rect_within_actor.y = actor_box.y1;
rect_within_actor.width = actor_box.x2 - actor_box.x1;
rect_within_actor.height = actor_box.y2 - actor_box.y1;
if (clutter_actor_is_in_clone_paint (actor))
{
untransformed = FALSE;
}
else
{
clutter_actor_get_transformed_position (actor,
&transformed_x,
&transformed_y);
rect_within_stage.x = floorf (transformed_x);
rect_within_stage.y = floorf (transformed_y);
clutter_actor_get_transformed_size (actor,
&transformed_width,
&transformed_height);
rect_within_stage.width = ceilf (transformed_width);
rect_within_stage.height = ceilf (transformed_height);
untransformed =
rect_within_actor.x == rect_within_stage.x &&
rect_within_actor.y == rect_within_stage.y &&
rect_within_actor.width == rect_within_stage.width &&
rect_within_actor.height == rect_within_stage.height;
}
if (untransformed) /* actor and stage space are the same */
{
if (self->clip_region)
{
region = cairo_region_copy (self->clip_region);
cairo_region_intersect_rectangle (region, &rect_within_stage);
}
else
{
const cairo_region_t *redraw_clip;
redraw_clip = clutter_paint_context_get_redraw_clip (paint_context);
if (redraw_clip)
{
region = cairo_region_copy (redraw_clip);
cairo_region_intersect_rectangle (region, &rect_within_stage);
}
else
{
region = cairo_region_create_rectangle (&rect_within_stage);
}
}
}
else /* actor and stage space are different but we need actor space */
{
if (self->clip_region)
{
region = cairo_region_copy (self->clip_region);
cairo_region_intersect_rectangle (region, &rect_within_actor);
}
else
{
region = cairo_region_create_rectangle (&rect_within_actor);
}
}
if (self->unobscured_region)
cairo_region_intersect (region, self->unobscured_region);
/* region is now in actor space */
if (cairo_region_is_empty (region))
{
cairo_region_destroy (region);
return;
}
setup_pipeline (self, actor, paint_context, &rect_within_actor);
set_glsl_parameters (self, &rect_within_actor);
/* Limit to how many separate rectangles we'll draw; beyond this just
* fall back and draw the whole thing */
#define MAX_RECTS 64
n_rects = cairo_region_num_rectangles (region);
if (n_rects <= MAX_RECTS)
{
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rect);
paint_clipped_rectangle (self, node, &actor_box, &rect);
}
}
else
{
cairo_rectangle_int_t rect;
cairo_region_get_extents (region, &rect);
paint_clipped_rectangle (self, node, &actor_box, &rect);
}
cairo_region_destroy (region);
}
static gboolean
meta_background_content_get_preferred_size (ClutterContent *content,
float *width,
float *height)
{
MetaBackgroundContent *background_content = META_BACKGROUND_CONTENT (content);
MetaRectangle monitor_geometry;
meta_display_get_monitor_geometry (background_content->display,
background_content->monitor,
&monitor_geometry);
if (width)
*width = monitor_geometry.width;
if (height)
*height = monitor_geometry.height;
return TRUE;
}
static void
clutter_content_iface_init (ClutterContentInterface *iface)
{
iface->paint_content = meta_background_content_paint_content;
iface->get_preferred_size = meta_background_content_get_preferred_size;
}
static void
set_monitor (MetaBackgroundContent *self,
int monitor)
{
MetaRectangle old_monitor_geometry;
MetaRectangle new_monitor_geometry;
MetaDisplay *display = self->display;
if(self->monitor == monitor)
return;
meta_display_get_monitor_geometry (display, self->monitor, &old_monitor_geometry);
meta_display_get_monitor_geometry (display, monitor, &new_monitor_geometry);
if(old_monitor_geometry.height != new_monitor_geometry.height)
invalidate_pipeline (self, CHANGED_GRADIENT_PARAMETERS);
self->monitor = monitor;
}
static void
meta_background_content_dispose (GObject *object)
{
MetaBackgroundContent *self = META_BACKGROUND_CONTENT (object);
set_clip_region (self, NULL);
set_unobscured_region (self, NULL);
meta_background_content_set_background (self, NULL);
g_clear_pointer (&self->pipeline, cogl_object_unref);
G_OBJECT_CLASS (meta_background_content_parent_class)->dispose (object);
}
static void
meta_background_content_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MetaBackgroundContent *self = META_BACKGROUND_CONTENT (object);
switch (prop_id)
{
case PROP_META_DISPLAY:
self->display = g_value_get_object (value);
break;
case PROP_MONITOR:
set_monitor (self, g_value_get_int (value));
break;
case PROP_BACKGROUND:
meta_background_content_set_background (self, g_value_get_object (value));
break;
case PROP_GRADIENT:
meta_background_content_set_gradient (self,
g_value_get_boolean (value),
self->gradient_height,
self->gradient_max_darkness);
break;
case PROP_GRADIENT_HEIGHT:
meta_background_content_set_gradient (self,
self->gradient,
g_value_get_int (value),
self->gradient_max_darkness);
break;
case PROP_GRADIENT_MAX_DARKNESS:
meta_background_content_set_gradient (self,
self->gradient,
self->gradient_height,
g_value_get_double (value));
break;
case PROP_VIGNETTE:
meta_background_content_set_vignette (self,
g_value_get_boolean (value),
self->vignette_brightness,
self->vignette_sharpness);
break;
case PROP_VIGNETTE_SHARPNESS:
meta_background_content_set_vignette (self,
self->vignette,
self->vignette_brightness,
g_value_get_double (value));
break;
case PROP_VIGNETTE_BRIGHTNESS:
meta_background_content_set_vignette (self,
self->vignette,
g_value_get_double (value),
self->vignette_sharpness);
break;
case PROP_ROUNDED_CLIP_RADIUS:
meta_background_content_set_rounded_clip_radius (self,
g_value_get_float (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_background_content_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MetaBackgroundContent *self = META_BACKGROUND_CONTENT (object);
switch (prop_id)
{
case PROP_META_DISPLAY:
g_value_set_object (value, self->display);
break;
case PROP_MONITOR:
g_value_set_int (value, self->monitor);
break;
case PROP_BACKGROUND:
g_value_set_object (value, self->background);
break;
case PROP_GRADIENT:
g_value_set_boolean (value, self->gradient);
break;
case PROP_GRADIENT_HEIGHT:
g_value_set_int (value, self->gradient_height);
break;
case PROP_GRADIENT_MAX_DARKNESS:
g_value_set_double (value, self->gradient_max_darkness);
break;
case PROP_VIGNETTE:
g_value_set_boolean (value, self->vignette);
break;
case PROP_VIGNETTE_BRIGHTNESS:
g_value_set_double (value, self->vignette_brightness);
break;
case PROP_VIGNETTE_SHARPNESS:
g_value_set_double (value, self->vignette_sharpness);
break;
case PROP_ROUNDED_CLIP_RADIUS:
g_value_set_float (value, self->rounded_clip_radius);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
meta_background_content_class_init (MetaBackgroundContentClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = meta_background_content_dispose;
object_class->set_property = meta_background_content_set_property;
object_class->get_property = meta_background_content_get_property;
properties[PROP_META_DISPLAY] =
g_param_spec_object ("meta-display",
"MetaDisplay",
"MetaDisplay",
META_TYPE_DISPLAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
properties[PROP_MONITOR] =
g_param_spec_int ("monitor",
"monitor",
"monitor",
0, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
properties[PROP_BACKGROUND] =
g_param_spec_object ("background",
"Background",
"MetaBackground object holding background parameters",
META_TYPE_BACKGROUND,
G_PARAM_READWRITE);
properties[PROP_GRADIENT] =
g_param_spec_boolean ("gradient",
"Gradient",
"Whether gradient effect is enabled",
FALSE,
G_PARAM_READWRITE);
properties[PROP_GRADIENT_HEIGHT] =
g_param_spec_int ("gradient-height",
"Gradient Height",
"Height of gradient effect",
0, G_MAXINT, 0,
G_PARAM_READWRITE);
properties[PROP_GRADIENT_MAX_DARKNESS] =
g_param_spec_double ("gradient-max-darkness",
"Gradient Max Darkness",
"How dark is the gradient initially",
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
properties[PROP_VIGNETTE] =
g_param_spec_boolean ("vignette",
"Vignette",
"Whether vignette effect is enabled",
FALSE,
G_PARAM_READWRITE);
properties[PROP_VIGNETTE_BRIGHTNESS] =
g_param_spec_double ("brightness",
"Vignette Brightness",
"Brightness of vignette effect",
0.0, 1.0, 1.0,
G_PARAM_READWRITE);
properties[PROP_VIGNETTE_SHARPNESS] =
g_param_spec_double ("vignette-sharpness",
"Vignette Sharpness",
"Sharpness of vignette effect",
0.0, G_MAXDOUBLE, 0.0,
G_PARAM_READWRITE);
properties[PROP_ROUNDED_CLIP_RADIUS] =
g_param_spec_float ("rounded-clip-radius",
"Rounded clip radius",
"Rounded clip radius",
0.0, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS |
G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, N_PROPS, properties);
}
static void
meta_background_content_init (MetaBackgroundContent *self)
{
self->gradient = FALSE;
self->gradient_height = 0;
self->gradient_max_darkness = 0.0;
self->vignette = FALSE;
self->vignette_brightness = 1.0;
self->vignette_sharpness = 0.0;
self->has_rounded_clip = FALSE;
self->rounded_clip_radius = 0.0;
}
/**
* meta_background_content_new:
* @monitor: Index of the monitor for which to draw the background
*
* Creates a new actor to draw the background for the given monitor.
*
* Return value: (transfer full): the newly created background actor
*/
ClutterContent *
meta_background_content_new (MetaDisplay *display,
int monitor)
{
return g_object_new (META_TYPE_BACKGROUND_CONTENT,
"meta-display", display,
"monitor", monitor,
NULL);
}
void
meta_background_content_set_background (MetaBackgroundContent *self,
MetaBackground *background)
{
g_return_if_fail (META_IS_BACKGROUND_CONTENT (self));
g_return_if_fail (background == NULL || META_IS_BACKGROUND (background));
if (background == self->background)
return;
if (self->background)
{
g_signal_handlers_disconnect_by_func (self->background,
(gpointer)on_background_changed,
self);
g_clear_object (&self->background);
}
if (background)
{
self->background = g_object_ref (background);
g_signal_connect (self->background, "changed",
G_CALLBACK (on_background_changed), self);
}
invalidate_pipeline (self, CHANGED_BACKGROUND);
clutter_content_invalidate (CLUTTER_CONTENT (self));
}
void
meta_background_content_set_gradient (MetaBackgroundContent *self,
gboolean enabled,
int height,
double max_darkness)
{
gboolean changed = FALSE;
g_return_if_fail (META_IS_BACKGROUND_CONTENT (self));
g_return_if_fail (height >= 0);
g_return_if_fail (max_darkness >= 0. && max_darkness <= 1.);
enabled = enabled != FALSE && height != 0;
if (enabled != self->gradient)
{
self->gradient = enabled;
invalidate_pipeline (self, CHANGED_EFFECTS);
changed = TRUE;
}
if (height != self->gradient_height || max_darkness != self->gradient_max_darkness)
{
self->gradient_height = height;
self->gradient_max_darkness = max_darkness;
invalidate_pipeline (self, CHANGED_GRADIENT_PARAMETERS);
changed = TRUE;
}
if (changed)
clutter_content_invalidate (CLUTTER_CONTENT (self));
}
void
meta_background_content_set_vignette (MetaBackgroundContent *self,
gboolean enabled,
double brightness,
double sharpness)
{
gboolean changed = FALSE;
g_return_if_fail (META_IS_BACKGROUND_CONTENT (self));
g_return_if_fail (brightness >= 0. && brightness <= 1.);
g_return_if_fail (sharpness >= 0.);
enabled = enabled != FALSE;
if (enabled != self->vignette)
{
self->vignette = enabled;
invalidate_pipeline (self, CHANGED_EFFECTS);
changed = TRUE;
}
if (brightness != self->vignette_brightness || sharpness != self->vignette_sharpness)
{
self->vignette_brightness = brightness;
self->vignette_sharpness = sharpness;
invalidate_pipeline (self, CHANGED_VIGNETTE_PARAMETERS);
changed = TRUE;
}
if (changed)
clutter_content_invalidate (CLUTTER_CONTENT (self));
}
void
meta_background_content_set_rounded_clip_radius (MetaBackgroundContent *self,
float radius)
{
gboolean enabled;
gboolean changed = FALSE;
g_return_if_fail (META_IS_BACKGROUND_CONTENT (self));
g_return_if_fail (radius >= 0.0);
enabled = radius > 0.0;
if (enabled != self->has_rounded_clip)
{
self->has_rounded_clip = enabled;
invalidate_pipeline (self, CHANGED_EFFECTS);
changed = TRUE;
}
if (!G_APPROX_VALUE (radius, self->rounded_clip_radius, FLT_EPSILON))
{
self->rounded_clip_radius = radius;
invalidate_pipeline (self, CHANGED_ROUNDED_CLIP_PARAMETERS);
changed = TRUE;
}
if (changed)
{
clutter_content_invalidate (CLUTTER_CONTENT (self));
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ROUNDED_CLIP_RADIUS]);
}
}
/**
* meta_background_content_set_rounded_clip_bounds:
* @self: The #MetaBackgroundContent
* @bounds: (allow-none): The new bounding clip rectangle, or %NULL
*
* Sets the bounding clip rectangle of the #MetaBackgroundContent that's used
* when a rounded clip set via meta_background_content_set_rounded_clip_radius()
* is in effect, set it to %NULL to use no bounding clip, rounding the edges
* of the full texture.
*/
void
meta_background_content_set_rounded_clip_bounds (MetaBackgroundContent *self,
const graphene_rect_t *bounds)
{
g_return_if_fail (META_IS_BACKGROUND_CONTENT (self));
if (bounds == NULL)
{
if (!self->rounded_clip_bounds_set)
return;
self->rounded_clip_bounds_set = FALSE;
}
else
{
if (self->rounded_clip_bounds_set &&
graphene_rect_equal (&self->rounded_clip_bounds, bounds))
return;
self->rounded_clip_bounds_set = TRUE;
graphene_rect_init_from_rect (&self->rounded_clip_bounds, bounds);
}
invalidate_pipeline (self, CHANGED_ROUNDED_CLIP_PARAMETERS);
clutter_content_invalidate (CLUTTER_CONTENT (self));
}
cairo_region_t *
meta_background_content_get_clip_region (MetaBackgroundContent *self)
{
return self->clip_region;
}
void
meta_background_content_cull_out (MetaBackgroundContent *self,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
set_unobscured_region (self, unobscured_region);
set_clip_region (self, clip_region);
}
void
meta_background_content_reset_culling (MetaBackgroundContent *self)
{
set_unobscured_region (self, NULL);
set_clip_region (self, NULL);
}
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