Commit f2cb8f12 authored by Benjamin Otte's avatar Benjamin Otte

blur: Use recording surface for capturing things to blur

This gets around clipping issues quite nicely and provides us with a
(mostly theoretical) performance boost.
parent 3377271e
......@@ -21,6 +21,8 @@
#include "gtkcssshadowvalueprivate.h"
#include <math.h>
#include "gtkcairoblurprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
......@@ -309,7 +311,7 @@ static cairo_t *
gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
cairo_t *cr)
{
cairo_rectangle_int_t clip_rect;
cairo_rectangle_t clip;
cairo_surface_t *surface;
cairo_t *blur_cr;
gdouble radius;
......@@ -318,13 +320,16 @@ gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
if (radius == 0.0)
return cr;
gdk_cairo_get_clip_rectangle (cr, &clip_rect);
radius = ceil (radius);
cairo_clip_extents (cr, &clip.x, &clip.y, &clip.width, &clip.height);
clip.x -= radius;
clip.y -= radius;
clip.width += 2 * radius;
clip.height += 2 * radius;
/* 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);
surface = cairo_recording_surface_create (CAIRO_CONTENT_COLOR_ALPHA, &clip);
cairo_surface_set_device_offset (surface, - clip.x, - clip.y);
blur_cr = cairo_create (surface);
cairo_set_user_data (blur_cr, &shadow_key, cairo_reference (cr), (cairo_destroy_func_t) cairo_destroy);
......@@ -344,23 +349,39 @@ gtk_css_shadow_value_finish_drawing (const GtkCssValue *shadow,
cairo_t *cr)
{
gdouble radius;
cairo_t *original_cr;
cairo_surface_t *surface;
cairo_t *original_cr, *image_cr;
cairo_surface_t *recording_surface, *image_surface;
cairo_rectangle_t ink;
radius = _gtk_css_number_value_get (shadow->radius, 0);
if (radius == 0.0)
return cr;
surface = cairo_get_target (cr);
recording_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_recording_surface_ink_extents (recording_surface, &ink.x, &ink.y, &ink.width, &ink.height);
ink.width = ceil (ink.width + ink.x - floor (ink.x)) + 2 * ceil (radius);
ink.height = ceil (ink.height + ink.y - floor (ink.y)) + 2 * ceil (radius);
ink.x = floor (ink.x) + ceil (radius);
ink.y = floor (ink.y) + ceil (radius);
image_surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, ink.width, ink.height);
cairo_surface_set_device_offset (image_surface, - ink.x, - ink.y);
image_cr = cairo_create (image_surface);
cairo_set_source_surface (image_cr, recording_surface, 0, 0);
cairo_paint (image_cr);
cairo_destroy (image_cr);
_gtk_cairo_blur_surface (image_surface, radius);
cairo_set_source_surface (original_cr, image_surface, 0, 0);
cairo_paint (original_cr);
cairo_destroy (cr);
cairo_surface_destroy (image_surface);
return original_cr;
}
......
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