gtk2/gtk/gtkcssshadowsvalue.c
Benjamin Otte e9fb8ad1f7 css: Fix computation of pixels occupied by blur radius
These computations were done randomly in lots of places and more often
than not, they were also wrong.
This function was copied (with docs) from Firefox:
  http://lxr.mozilla.org/mozilla-central/source/gfx/2d/Blur.cpp

https://bugzilla.gnome.org/show_bug.cgi?id=723159
2014-02-03 21:38:16 +01:00

340 lines
9.3 KiB
C

/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Red Hat, Inc.
*
* Author: Cosimo Cecchi <cosimoc@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcssshadowsvalueprivate.h"
#include "gtkcairoblurprivate.h"
#include "gtkcssshadowvalueprivate.h"
#include <string.h>
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
guint len;
GtkCssValue *values[1];
};
static GtkCssValue * gtk_css_shadows_value_new (GtkCssValue **values,
guint len);
static void
gtk_css_value_shadows_free (GtkCssValue *value)
{
guint i;
for (i = 0; i < value->len; i++)
{
_gtk_css_value_unref (value->values[i]);
}
g_slice_free1 (sizeof (GtkCssValue) + sizeof (GtkCssValue *) * (value->len - 1), value);
}
static GtkCssValue *
gtk_css_value_shadows_compute (GtkCssValue *value,
guint property_id,
GtkStyleProviderPrivate *provider,
int scale,
GtkCssComputedValues *values,
GtkCssComputedValues *parent_values,
GtkCssDependencies *dependencies)
{
GtkCssValue *result;
GtkCssDependencies child_deps;
guint i;
if (value->len == 0)
return _gtk_css_value_ref (value);
result = gtk_css_shadows_value_new (value->values, value->len);
for (i = 0; i < value->len; i++)
{
result->values[i] = _gtk_css_value_compute (value->values[i], property_id, provider, scale, values, parent_values, &child_deps);
*dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
}
return result;
}
static gboolean
gtk_css_value_shadows_equal (const GtkCssValue *value1,
const GtkCssValue *value2)
{
guint i;
/* XXX: Should we fill up here? */
if (value1->len != value2->len)
return FALSE;
for (i = 0; i < value1->len; i++)
{
if (!_gtk_css_value_equal (value1->values[i],
value2->values[i]))
return FALSE;
}
return TRUE;
}
static GtkCssValue *
gtk_css_value_shadows_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
guint i, len;
GtkCssValue **values;
/* catches the important case of 2 none values */
if (start == end)
return _gtk_css_value_ref (start);
if (start->len > end->len)
len = start->len;
else
len = end->len;
values = g_newa (GtkCssValue *, len);
for (i = 0; i < MIN (start->len, end->len); i++)
{
values[i] = _gtk_css_value_transition (start->values[i], end->values[i], property_id, progress);
if (values[i] == NULL)
{
while (i--)
_gtk_css_value_unref (values[i]);
return NULL;
}
}
if (start->len > end->len)
{
for (; i < len; i++)
{
GtkCssValue *fill = _gtk_css_shadow_value_new_for_transition (start->values[i]);
values[i] = _gtk_css_value_transition (start->values[i], fill, property_id, progress);
_gtk_css_value_unref (fill);
if (values[i] == NULL)
{
while (i--)
_gtk_css_value_unref (values[i]);
return NULL;
}
}
}
else
{
for (; i < len; i++)
{
GtkCssValue *fill = _gtk_css_shadow_value_new_for_transition (end->values[i]);
values[i] = _gtk_css_value_transition (fill, end->values[i], property_id, progress);
_gtk_css_value_unref (fill);
if (values[i] == NULL)
{
while (i--)
_gtk_css_value_unref (values[i]);
return NULL;
}
}
}
return gtk_css_shadows_value_new (values, len);
}
static void
gtk_css_value_shadows_print (const GtkCssValue *value,
GString *string)
{
guint i;
if (value->len == 0)
{
g_string_append (string, "none");
return;
}
for (i = 0; i < value->len; i++)
{
if (i > 0)
g_string_append (string, ", ");
_gtk_css_value_print (value->values[i], string);
}
}
static const GtkCssValueClass GTK_CSS_VALUE_SHADOWS = {
gtk_css_value_shadows_free,
gtk_css_value_shadows_compute,
gtk_css_value_shadows_equal,
gtk_css_value_shadows_transition,
gtk_css_value_shadows_print
};
static GtkCssValue none_singleton = { &GTK_CSS_VALUE_SHADOWS, 1, 0, { NULL } };
GtkCssValue *
_gtk_css_shadows_value_new_none (void)
{
return _gtk_css_value_ref (&none_singleton);
}
static GtkCssValue *
gtk_css_shadows_value_new (GtkCssValue **values,
guint len)
{
GtkCssValue *result;
g_return_val_if_fail (values != NULL, NULL);
g_return_val_if_fail (len > 0, NULL);
result = _gtk_css_value_alloc (&GTK_CSS_VALUE_SHADOWS, sizeof (GtkCssValue) + sizeof (GtkCssValue *) * (len - 1));
result->len = len;
memcpy (&result->values[0], values, sizeof (GtkCssValue *) * len);
return result;
}
GtkCssValue *
_gtk_css_shadows_value_parse (GtkCssParser *parser)
{
GtkCssValue *value, *result;
GPtrArray *values;
if (_gtk_css_parser_try (parser, "none", TRUE))
return _gtk_css_shadows_value_new_none ();
values = g_ptr_array_new ();
do {
value = _gtk_css_shadow_value_parse (parser);
if (value == NULL)
{
g_ptr_array_set_free_func (values, (GDestroyNotify) _gtk_css_value_unref);
g_ptr_array_free (values, TRUE);
return NULL;
}
g_ptr_array_add (values, value);
} while (_gtk_css_parser_try (parser, ",", TRUE));
result = gtk_css_shadows_value_new ((GtkCssValue **) values->pdata, values->len);
g_ptr_array_free (values, TRUE);
return result;
}
void
_gtk_css_shadows_value_paint_layout (const GtkCssValue *shadows,
cairo_t *cr,
PangoLayout *layout)
{
guint i;
g_return_if_fail (shadows->class == &GTK_CSS_VALUE_SHADOWS);
for (i = 0; i < shadows->len; i++)
{
_gtk_css_shadow_value_paint_layout (shadows->values[i], cr, layout);
}
}
void
_gtk_css_shadows_value_paint_icon (const GtkCssValue *shadows,
cairo_t *cr)
{
guint i;
g_return_if_fail (shadows->class == &GTK_CSS_VALUE_SHADOWS);
for (i = 0; i < shadows->len; i++)
{
_gtk_css_shadow_value_paint_icon (shadows->values[i], cr);
}
}
void
_gtk_css_shadows_value_paint_spinner (const GtkCssValue *shadows,
cairo_t *cr,
gdouble radius,
gdouble progress)
{
guint i;
g_return_if_fail (shadows->class == &GTK_CSS_VALUE_SHADOWS);
for (i = 0; i < shadows->len; i++)
{
_gtk_css_shadow_value_paint_spinner (shadows->values[i], cr, radius, progress);
}
}
void
_gtk_css_shadows_value_paint_box (const GtkCssValue *shadows,
cairo_t *cr,
const GtkRoundedBox *padding_box,
gboolean inset)
{
guint i;
g_return_if_fail (shadows->class == &GTK_CSS_VALUE_SHADOWS);
for (i = 0; i < shadows->len; i++)
{
if (inset == _gtk_css_shadow_value_get_inset (shadows->values[i]))
_gtk_css_shadow_value_paint_box (shadows->values[i], cr, padding_box);
}
}
void
_gtk_css_shadows_value_get_extents (const GtkCssValue *shadows,
GtkBorder *border)
{
guint i;
GtkBorder b = { 0 };
const GtkCssValue *shadow;
gdouble hoffset, voffset, spread, radius, clip_radius;
g_return_if_fail (shadows->class == &GTK_CSS_VALUE_SHADOWS);
for (i = 0; i < shadows->len; i++)
{
shadow = shadows->values[i];
if (_gtk_css_shadow_value_get_inset (shadow))
continue;
_gtk_css_shadow_value_get_geometry (shadow,
&hoffset, &voffset,
&radius, &spread);
clip_radius = _gtk_cairo_blur_compute_pixels (radius);
b.top = MAX (0, clip_radius + spread - voffset);
b.right = MAX (0, clip_radius + spread + hoffset);
b.bottom = MAX (0, clip_radius + spread + voffset);
b.left = MAX (0, clip_radius + spread - hoffset);
border->top = MAX (border->top, b.top);
border->right = MAX (border->right, b.right);
border->bottom = MAX (border->bottom, b.bottom);
border->left = MAX (border->left, b.left);
}
}