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st: Add StScrollViewFade:fade-edges

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Add a new property which controls whether edge areas are excluded
from the effect (the default and current behavior), or not.

https://bugzilla.gnome.org/show_bug.cgi?id=707409
This commit is contained in:
Florian Müllner 2013-09-04 17:53:41 +02:00
parent 6fb044f351
commit 4f5d3e00db
2 changed files with 46 additions and 5 deletions
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38
src/st/st-scroll-view-fade.c
View File

@ -49,6 +49,8 @@ struct _StScrollViewFade
StAdjustment *vadjustment;
StAdjustment *hadjustment;
guint fade_edges : 1;
float vfade_offset;
float hfade_offset;
};
@ -66,7 +68,8 @@ enum {
PROP_0,
PROP_VFADE_OFFSET,
PROP_HFADE_OFFSET
PROP_HFADE_OFFSET,
PROP_FADE_EDGES
};
static CoglHandle
@ -151,6 +154,7 @@ st_scroll_view_fade_paint_target (ClutterOffscreenEffect *effect)
clutter_shader_effect_set_uniform (shader, "tex", G_TYPE_INT, 1, 0);
clutter_shader_effect_set_uniform (shader, "height", G_TYPE_FLOAT, 1, clutter_actor_get_height (self->actor));
clutter_shader_effect_set_uniform (shader, "width", G_TYPE_FLOAT, 1, clutter_actor_get_width (self->actor));
clutter_shader_effect_set_uniform (shader, "fade_edges", G_TYPE_INT, 1, self->fade_edges);
clutter_shader_effect_set_uniform (shader, "fade_area_topleft", CLUTTER_TYPE_SHADER_FLOAT, 2, fade_area_topleft);
clutter_shader_effect_set_uniform (shader, "fade_area_bottomright", CLUTTER_TYPE_SHADER_FLOAT, 2, fade_area_bottomright);
@ -292,6 +296,24 @@ st_scroll_view_hfade_set_offset (StScrollViewFade *self,
g_object_thaw_notify (G_OBJECT (self));
}
static void
st_scroll_view_fade_set_fade_edges (StScrollViewFade *self,
gboolean fade_edges)
{
if (self->fade_edges == fade_edges)
return;
g_object_freeze_notify (G_OBJECT (self));
self->fade_edges = fade_edges;
if (self->actor != NULL)
clutter_actor_queue_redraw (self->actor);
g_object_notify (G_OBJECT (self), "fade-edges");
g_object_thaw_notify (G_OBJECT (self));
}
static void
st_scroll_view_fade_set_property (GObject *object,
guint prop_id,
@ -308,6 +330,9 @@ st_scroll_view_fade_set_property (GObject *object,
case PROP_HFADE_OFFSET:
st_scroll_view_hfade_set_offset (self, g_value_get_float (value));
break;
case PROP_FADE_EDGES:
st_scroll_view_fade_set_fade_edges (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -330,6 +355,9 @@ st_scroll_view_fade_get_property (GObject *object,
case PROP_VFADE_OFFSET:
g_value_set_float (value, self->vfade_offset);
break;
case PROP_FADE_EDGES:
g_value_set_boolean (value, self->fade_edges);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -371,6 +399,14 @@ st_scroll_view_fade_class_init (StScrollViewFadeClass *klass)
"The width of the area which is faded at the edge",
0.f, G_MAXFLOAT, DEFAULT_FADE_OFFSET,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_FADE_EDGES,
g_param_spec_boolean ("fade-edges",
"Fade Edges",
"Whether the faded area should extend to the edges",
FALSE,
G_PARAM_READWRITE));
}

13
src/st/st-scroll-view-fade.glsl
View File

@ -24,6 +24,7 @@ uniform float vfade_offset;
uniform float hfade_offset;
uniform float vvalue;
uniform float hvalue;
uniform bool fade_edges;
uniform vec2 fade_area_topleft;
uniform vec2 fade_area_bottomright;
@ -44,10 +45,14 @@ void main ()
float ratio = 1.0;
float fade_bottom_start = fade_area_bottomright[1] - vfade_offset;
float fade_right_start = fade_area_bottomright[0] - hfade_offset;
bool fade_top = y < vfade_offset && vvalue > 0.0;
bool fade_bottom = y > fade_bottom_start && vvalue < 1.0;
bool fade_left = x < hfade_offset && hvalue > 0.0;
bool fade_right = x > fade_right_start && hvalue < 1.0;
bool fade_top = y < vfade_offset && (fade_edges ? vvalue >= 0.0
: vvalue > 0.0);
bool fade_bottom = y > fade_bottom_start && (fade_edges ? vvalue <= 1.0
: vvalue < 1.0);
bool fade_left = x < hfade_offset && (fade_edges ? hvalue >= 0.0
: hvalue > 0.0);
bool fade_right = x > fade_right_start && (fade_edges ? hvalue <= 1.0
: hvalue < 1.0);
float vfade_scale = height / vfade_offset;
if (fade_top) {