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Implement radial gradients for StWidget

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Some theme authors have stated interest in radial gradient backgrounds.
The w3c has some draft:

http://dev.w3.org/csswg/css3-images/#radial-gradients

As this is rather complex, we add only some very basic support, which
extends our syntax for linear gradients:

background-gradient-direction: [vertical|horizontal|radial]

Gradients are centered circles, whose size is determined by the closest
side.

https://bugzilla.gnome.org/show_bug.cgi?id=604945
This commit is contained in:
Florian Müllner 2010-01-10 02:17:01 +01:00
parent 33b3d05039
commit 59d6029f47
3 changed files with 15 additions and 2 deletions
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4
src/st/st-theme-node.c
View File

@ -1356,6 +1356,10 @@ ensure_background (StThemeNode *node)
{
node->background_gradient_type = ST_GRADIENT_HORIZONTAL;
}
else if (strcmp (term->content.str->stryng->str, "radial") == 0)
{
node->background_gradient_type = ST_GRADIENT_RADIAL;
}
else
{
g_warning ("Unrecognized background-gradient-direction \"%s\"",

3
src/st/st-theme-node.h
View File

@ -61,7 +61,8 @@ typedef enum {
typedef enum {
ST_GRADIENT_NONE,
ST_GRADIENT_VERTICAL,
ST_GRADIENT_HORIZONTAL
ST_GRADIENT_HORIZONTAL,
ST_GRADIENT_RADIAL
} StGradientType;
GType st_theme_node_get_type (void) G_GNUC_CONST;

10
src/st/st-widget.c
View File

@ -632,8 +632,16 @@ st_widget_redraw_gradient (StWidget *widget)
if (priv->bg_gradient_type == ST_GRADIENT_VERTICAL)
pattern = cairo_pattern_create_linear (0, 0, 0, height);
else
else if (priv->bg_gradient_type == ST_GRADIENT_HORIZONTAL)
pattern = cairo_pattern_create_linear (0, 0, width, 0);
else
{
gdouble cx, cy;
cx = width / 2.;
cy = height / 2.;
pattern = cairo_pattern_create_radial (cx, cy, 0, cx, cy, MIN (cx, cy));
}
cairo_pattern_add_color_stop_rgba (pattern, 0,
start->red / 255.,