AuroraMiddleware/gtk
1
0
Fork 1
mirror of https://gitlab.gnome.org/GNOME/gtk.git synced 2024-11-17 23:00:07 +00:00
Code Issues Projects Releases Wiki Activity

cssimage: Add a hack to get antialiased circles

Browse Source 
We like to draw circles in themes, and as radial gradients are the only
okayish way to do that, at least make them antialiased.
This commit is contained in:
Benjamin Otte 2012-09-18 13:26:20 +02:00
parent db089f4b8a
commit 8c3caae33f
1 changed files with 51 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
gtk/gtkcssimagegradient.c
View File

@ -46,6 +46,54 @@ gtk_css_image_gradient_compute (GtkCssImage *image,
return GTK_CSS_IMAGE (copy);
}
static gboolean
gtk_css_image_gradient_draw_circle (GtkCssImageGradient *image,
cairo_t *cr,
double width,
double height)
{
cairo_pattern_t *pattern = image->pattern;
double x0, y0, x1, y1, r0, r1;
GdkRGBA color0, color1;
double offset0, offset1;
int n_stops;
if (cairo_pattern_get_type (pattern) != CAIRO_PATTERN_TYPE_RADIAL)
return FALSE;
if (cairo_pattern_get_extend (pattern) != CAIRO_EXTEND_PAD)
return FALSE;
cairo_pattern_get_radial_circles (pattern, &x0, &y0, &r0, &x1, &y1, &r1);
if (x0 != x1 ||
y0 != y1 ||
r0 != 0.0)
return FALSE;
cairo_pattern_get_color_stop_count (pattern, &n_stops);
if (n_stops != 2)
return FALSE;
cairo_pattern_get_color_stop_rgba (pattern, 0, &offset0, &color0.red, &color0.green, &color0.blue, &color0.alpha);
cairo_pattern_get_color_stop_rgba (pattern, 1, &offset1, &color1.red, &color1.green, &color1.blue, &color1.alpha);
if (offset0 != offset1)
return FALSE;
cairo_scale (cr, width, height);
cairo_rectangle (cr, 0, 0, 1, 1);
cairo_clip (cr);
gdk_cairo_set_source_rgba (cr, &color1);
cairo_paint (cr);
gdk_cairo_set_source_rgba (cr, &color0);
cairo_arc (cr, x1, y1, r1 * offset1, 0, 2 * G_PI);
cairo_fill (cr);
return TRUE;
}
static void
gtk_css_image_gradient_draw (GtkCssImage *image,
cairo_t *cr,
@ -60,6 +108,9 @@ gtk_css_image_gradient_draw (GtkCssImage *image,
return;
}
if (gtk_css_image_gradient_draw_circle (gradient, cr, width, height))
return;
cairo_scale (cr, width, height);
cairo_rectangle (cr, 0, 0, 1, 1);