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shadow-box: Blur only horizontally/vertically for the non-corner parts

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There is no need to e.g. blur in the x-direction for the top part
of a box shadow. Also, there is no need to extend the mask in the
non-blurred direction.

https://bugzilla.gnome.org/show_bug.cgi?id=746468
This commit is contained in:
Alexander Larsson 2015-03-20 14:34:44 +01:00
parent 9c2a16fb3b
commit 967cb56275
4 changed files with 65 additions and 34 deletions
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39
gtk/gtkcairoblur.c
View File

@ -173,27 +173,34 @@ flip_buffer (guchar *dst_buffer,
}
static void
_boxblur (guchar *buffer,
int width,
int height,
int radius)
_boxblur (guchar *buffer,
int width,
int height,
int radius,
GtkBlurFlags flags)
{
guchar *flipped_buffer;
int d = get_box_filter_size (radius);
flipped_buffer = g_malloc (width * height);
/* Step 1: swap rows and columns */
flip_buffer (flipped_buffer, buffer, width, height);
if (flags & GTK_BLUR_Y)
{
/* Step 1: swap rows and columns */
flip_buffer (flipped_buffer, buffer, width, height);
/* Step 2: blur rows (really columns) */
blur_rows (flipped_buffer, buffer, height, width, d);
/* Step 2: blur rows (really columns) */
blur_rows (flipped_buffer, buffer, height, width, d);
/* Step 3: swap rows and columns */
flip_buffer (buffer, flipped_buffer, height, width);
/* Step 3: swap rows and columns */
flip_buffer (buffer, flipped_buffer, height, width);
}
/* Step 4: blur rows */
blur_rows (buffer, flipped_buffer, width, height, d);
if (flags & GTK_BLUR_X)
{
/* Step 4: blur rows */
blur_rows (buffer, flipped_buffer, width, height, d);
}
g_free (flipped_buffer);
}
@ -207,7 +214,8 @@ _boxblur (guchar *buffer,
*/
void
_gtk_cairo_blur_surface (cairo_surface_t* surface,
double radius_d)
double radius_d,
GtkBlurFlags flags)
{
int radius = radius_d;
@ -220,13 +228,16 @@ _gtk_cairo_blur_surface (cairo_surface_t* surface,
if (radius <= 1)
return;
if ((flags & (GTK_BLUR_X|GTK_BLUR_Y)) == 0)
return;
/* Before we mess with the surface, execute any pending drawing. */
cairo_surface_flush (surface);
_boxblur (cairo_image_surface_get_data (surface),
cairo_image_surface_get_stride (surface),
cairo_image_surface_get_height (surface),
radius);
radius, flags);
/* Inform cairo we altered the surface contents. */
cairo_surface_mark_dirty (surface);

9
gtk/gtkcairoblurprivate.h
View File

@ -29,8 +29,15 @@
G_BEGIN_DECLS
typedef enum {
GTK_BLUR_NONE = 0,
GTK_BLUR_X = 1<<0,
GTK_BLUR_Y = 1<<1
} GtkBlurFlags;
void _gtk_cairo_blur_surface (cairo_surface_t *surface,
double radius);
double radius,
GtkBlurFlags flags);;
int _gtk_cairo_blur_compute_pixels (double radius);
G_END_DECLS

49
gtk/gtkcssshadowvalue.c
View File

@ -310,12 +310,15 @@ static const cairo_user_data_key_t original_cr_key;
static cairo_t *
gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
cairo_t *cr)
cairo_t *cr,
GtkBlurFlags blur_flags)
{
cairo_rectangle_int_t clip_rect;
cairo_surface_t *surface;
cairo_t *blur_cr;
gdouble radius, clip_radius;
gboolean blur_x = (blur_flags & GTK_BLUR_X) != 0;
gboolean blur_y = (blur_flags & GTK_BLUR_Y) != 0;
if (!needs_blur (shadow))
return cr;
@ -328,9 +331,11 @@ gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
/* Create a larger surface to center the blur. */
surface = cairo_surface_create_similar_image (cairo_get_target (cr),
CAIRO_FORMAT_A8,
clip_rect.width + 2 * clip_radius,
clip_rect.height + 2 * clip_radius);
cairo_surface_set_device_offset (surface, clip_radius - clip_rect.x, clip_radius - clip_rect.y);
clip_rect.width + (blur_x ? 2 * clip_radius : 0),
clip_rect.height + (blur_y ? 2 * clip_radius : 0));
cairo_surface_set_device_offset (surface,
(blur_x ? clip_radius : 0) - clip_rect.x,
(blur_y ? clip_radius : 0) - clip_rect.y);
blur_cr = cairo_create (surface);
cairo_set_user_data (blur_cr, &original_cr_key, cairo_reference (cr), (cairo_destroy_func_t) cairo_destroy);
@ -347,7 +352,8 @@ gtk_css_shadow_value_start_drawing (const GtkCssValue *shadow,
static cairo_t *
gtk_css_shadow_value_finish_drawing (const GtkCssValue *shadow,
cairo_t *cr)
cairo_t *cr,
GtkBlurFlags blur_flags)
{
gdouble radius;
cairo_t *original_cr;
@ -361,12 +367,13 @@ gtk_css_shadow_value_finish_drawing (const GtkCssValue *shadow,
/* Blur the surface. */
surface = cairo_get_target (cr);
radius = _gtk_css_number_value_get (shadow->radius, 0);
_gtk_cairo_blur_surface (surface, radius);
_gtk_cairo_blur_surface (surface, radius, blur_flags);
gdk_cairo_set_source_rgba (original_cr, _gtk_css_rgba_value_get_rgba (shadow->color));
cairo_mask_surface (original_cr, surface, 0, 0);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return original_cr;
@ -428,7 +435,7 @@ make_blurred_pango_surface (cairo_t *existing_cr,
cr = cairo_create (surface);
cairo_move_to (cr, 0, 0);
_gtk_pango_fill_layout (cr, layout);
_gtk_cairo_blur_surface (surface, radius * x_scale);
_gtk_cairo_blur_surface (surface, radius * x_scale, GTK_BLUR_X | GTK_BLUR_Y);
cairo_destroy (cr);
@ -515,14 +522,14 @@ _gtk_css_shadow_value_paint_icon (const GtkCssValue *shadow,
pattern = cairo_pattern_reference (cairo_get_source (cr));
gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
cr = gtk_css_shadow_value_start_drawing (shadow, cr);
cr = gtk_css_shadow_value_start_drawing (shadow, cr, GTK_BLUR_X | GTK_BLUR_Y);
cairo_translate (cr,
_gtk_css_number_value_get (shadow->hoffset, 0),
_gtk_css_number_value_get (shadow->voffset, 0));
cairo_mask (cr, pattern);
cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
cr = gtk_css_shadow_value_finish_drawing (shadow, cr, GTK_BLUR_X | GTK_BLUR_Y);
cairo_restore (cr);
cairo_pattern_destroy (pattern);
@ -570,16 +577,18 @@ draw_shadow (const GtkCssValue *shadow,
cairo_t *cr,
GtkRoundedBox *box,
GtkRoundedBox *clip_box,
gboolean blur)
GtkBlurFlags blur_flags)
{
cairo_t *shadow_cr;
gboolean do_blur;
if (has_empty_clip (cr))
return;
gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
if (blur)
shadow_cr = gtk_css_shadow_value_start_drawing (shadow, cr);
do_blur = (blur_flags & (GTK_BLUR_X | GTK_BLUR_Y)) != 0;
if (do_blur)
shadow_cr = gtk_css_shadow_value_start_drawing (shadow, cr, blur_flags);
else
shadow_cr = cr;
@ -590,8 +599,8 @@ draw_shadow (const GtkCssValue *shadow,
cairo_fill (shadow_cr);
if (blur)
gtk_css_shadow_value_finish_drawing (shadow, shadow_cr);
if (do_blur)
gtk_css_shadow_value_finish_drawing (shadow, shadow_cr, blur_flags);
}
void
@ -647,7 +656,7 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
_gtk_rounded_box_shrink (&clip_box, -clip_radius, -clip_radius, -clip_radius, -clip_radius);
if (!needs_blur (shadow))
draw_shadow (shadow, cr, &box, &clip_box, FALSE);
draw_shadow (shadow, cr, &box, &clip_box, GTK_BLUR_NONE);
else
{
int i, x1, x2, y1, y2;
@ -717,7 +726,7 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
/* Also clip with remaining to ensure we never draw any area twice */
gdk_cairo_region (cr, remaining);
cairo_clip (cr);
draw_shadow (shadow, cr, &box, &clip_box, TRUE);
draw_shadow (shadow, cr, &box, &clip_box, GTK_BLUR_X | GTK_BLUR_Y);
cairo_restore (cr);
/* We drew the region, remove it from remaining */
@ -731,8 +740,11 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
/* Then the sides */
for (i = 0; i < 4; i++)
{
GtkBlurFlags blur_flags = 0;
if (i == GTK_CSS_TOP || i == GTK_CSS_BOTTOM)
{
blur_flags |= GTK_BLUR_Y;
x1 = floor (box.box.x - clip_radius);
x2 = ceil (box.box.x + box.box.width + clip_radius);
}
@ -749,6 +761,7 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
if (i == GTK_CSS_LEFT || i == GTK_CSS_RIGHT)
{
blur_flags |= GTK_BLUR_X;
y1 = floor (box.box.y - clip_radius);
y2 = ceil (box.box.y + box.box.height + clip_radius);
}
@ -769,7 +782,7 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
/* Also clip with remaining to ensure we never draw any area twice */
gdk_cairo_region (cr, remaining);
cairo_clip (cr);
draw_shadow (shadow, cr, &box, &clip_box, TRUE);
draw_shadow (shadow, cr, &box, &clip_box, blur_flags);
cairo_restore (cr);
/* We drew the region, remove it from remaining */
@ -785,7 +798,7 @@ _gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
cairo_save (cr);
gdk_cairo_region (cr, remaining);
cairo_clip (cr);
draw_shadow (shadow, cr, &box, &clip_box, FALSE);
draw_shadow (shadow, cr, &box, &clip_box, GTK_BLUR_NONE);
cairo_restore (cr);
cairo_region_destroy (remaining);

2
tests/blur-performance.c
View File

@ -41,7 +41,7 @@ main (int argc, char **argv)
{
init_surface (cr);
g_timer_start (timer);
_gtk_cairo_blur_surface (surface, i);
_gtk_cairo_blur_surface (surface, i, GTK_BLUR_X | GTK_BLUR_Y);
msec = g_timer_elapsed (timer, NULL) * 1000;
if (j == 1)
g_print ("Radius %2d: %.2f msec, %.2f kpixels/msec:\n", i, msec, size*size/(msec*1000));