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shadow: add code to render blurred shadows

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Split out the blurred shadow rendering in three steps:
- creation of a surface of the appropriate size - we use the clip
  rectangle as a good measurement for the size, since we won't render
  out of it anyway
- painting the unblurred shape on the surface - this is responsibility
  of the single shadow implementations
- blur the surface and compose the result back on the original cairo_t

This means we can share code between the implementations for the first
and third steps; it also makes the code independent of the rendered
size, so we can avoid passing down a cairo_rectangle_t with e.g. the
icon coordinates.
This commit is contained in:
Cosimo Cecchi 2012-04-17 15:43:58 -04:00 committed by Benjamin Otte
parent a239f2e8b0
commit b609686133
1 changed files with 63 additions and 0 deletions
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63
gtk/gtkcssshadowvalue.c
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@ -21,6 +21,7 @@
#include "gtkcssshadowvalueprivate.h"
#include "gtkcairoblurprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkstylecontextprivate.h"
@ -302,6 +303,68 @@ fail:
return NULL;
}
static const cairo_user_data_key_t shadow_key;
static cairo_t *
gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
cairo_t *cr)
{
cairo_rectangle_int_t clip_rect;
cairo_surface_t *surface;
cairo_t *blur_cr;
gdouble radius;
radius = _gtk_css_number_value_get (shadow->radius, 0);
if (radius == 0.0)
return cr;
gdk_cairo_get_clip_rectangle (cr, &clip_rect);
/* Create a larger surface to center the blur. */
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
clip_rect.width + 2 * radius,
clip_rect.height + 2 * radius);
cairo_surface_set_device_offset (surface, radius - clip_rect.x, radius - clip_rect.y);
blur_cr = cairo_create (surface);
cairo_set_user_data (blur_cr, &shadow_key, cairo_reference (cr), (cairo_destroy_func_t) cairo_destroy);
if (cairo_has_current_point (cr))
{
double x, y;
cairo_get_current_point (cr, &x, &y);
cairo_move_to (blur_cr, x, y);
}
return blur_cr;
}
static cairo_t *
gtk_css_shadow_value_finish_drawing (const GtkCssValue *shadow,
cairo_t *cr)
{
gdouble radius;
cairo_t *original_cr;
cairo_surface_t *surface;
radius = _gtk_css_number_value_get (shadow->radius, 0);
if (radius == 0.0)
return cr;
surface = cairo_get_target (cr);
original_cr = cairo_get_user_data (cr, &shadow_key);
/* Blur the surface. */
_gtk_cairo_blur_surface (surface, radius);
cairo_set_source_surface (original_cr, surface, 0, 0);
cairo_paint (original_cr);
cairo_destroy (cr);
return original_cr;
}
void
_gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
cairo_t *cr,