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gtk2/gtk/gtkcssshadowvalue.c
Jasper St. Pierre 9f2e0902f6 gtkcssshadowvalue: Don't double-apply the alpha to shadows 
It turns out that when we were painting the shadows, we painted the them
with the base color once, which contained the alpha, and then blurred it
and used it as a mask for the fill, which has the fill again.

To fix this, always paint the base surface with full alpha. The existing
code applies the blur conditionally sometimes in weird ways, so the code
shuffling fix may not look correct, but be assured it is. If the blur
happens, the new cr we return has the *default* color applied, which is
fully opaque black, which works perfectly against the A8 surface.

The fallback spinner code needs some modification, since it is
intentionally using the alpha to paint the lobes which are "in the past".
Since we shouldn't be hitting this fallback path very often, we use a
temporary group and paint it with paint_with_alpha, even though it is
slow.
2014-08-02 18:58:19 -04:00

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/* 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 "gtkcssshadowvalueprivate.h"
#include "gtkcairoblurprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkstylecontextprivate.h"
#include "gtkthemingengineprivate.h"
#include "gtkpango.h"
#include <math.h>
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
guint inset :1;
GtkCssValue *hoffset;
GtkCssValue *voffset;
GtkCssValue *radius;
GtkCssValue *spread;
GtkCssValue *color;
};
static GtkCssValue * gtk_css_shadow_value_new (GtkCssValue *hoffset,
GtkCssValue *voffset,
GtkCssValue *radius,
GtkCssValue *spread,
gboolean inset,
GtkCssValue *color);
static void
gtk_css_value_shadow_free (GtkCssValue *shadow)
{
_gtk_css_value_unref (shadow->hoffset);
_gtk_css_value_unref (shadow->voffset);
_gtk_css_value_unref (shadow->radius);
_gtk_css_value_unref (shadow->spread);
_gtk_css_value_unref (shadow->color);
g_slice_free (GtkCssValue, shadow);
}
static GtkCssValue *
gtk_css_value_shadow_compute (GtkCssValue *shadow,
guint property_id,
GtkStyleProviderPrivate *provider,
int scale,
GtkCssComputedValues *values,
GtkCssComputedValues *parent_values,
GtkCssDependencies *dependencies)
{
GtkCssValue *hoffset, *voffset, *radius, *spread, *color;
GtkCssDependencies child_deps;
child_deps = 0;
hoffset = _gtk_css_value_compute (shadow->hoffset, property_id, provider, scale, values, parent_values, &child_deps);
*dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
child_deps = 0;
voffset = _gtk_css_value_compute (shadow->voffset, property_id, provider, scale, values, parent_values, &child_deps);
*dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
child_deps = 0;
radius = _gtk_css_value_compute (shadow->radius, property_id, provider, scale, values, parent_values, &child_deps);
*dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
child_deps = 0;
spread = _gtk_css_value_compute (shadow->spread, property_id, provider, scale, values, parent_values, &child_deps),
*dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
child_deps = 0;
color = _gtk_css_value_compute (shadow->color, property_id, provider, scale, values, parent_values, &child_deps);
*dependencies = _gtk_css_dependencies_union (*dependencies, child_deps);
return gtk_css_shadow_value_new (hoffset, voffset, radius, spread, shadow->inset, color);
}
static gboolean
gtk_css_value_shadow_equal (const GtkCssValue *shadow1,
const GtkCssValue *shadow2)
{
return shadow1->inset == shadow2->inset
&& _gtk_css_value_equal (shadow1->hoffset, shadow2->hoffset)
&& _gtk_css_value_equal (shadow1->voffset, shadow2->voffset)
&& _gtk_css_value_equal (shadow1->radius, shadow2->radius)
&& _gtk_css_value_equal (shadow1->spread, shadow2->spread)
&& _gtk_css_value_equal (shadow1->color, shadow2->color);
}
static GtkCssValue *
gtk_css_value_shadow_transition (GtkCssValue *start,
GtkCssValue *end,
guint property_id,
double progress)
{
if (start->inset != end->inset)
return NULL;
return gtk_css_shadow_value_new (_gtk_css_value_transition (start->hoffset, end->hoffset, property_id, progress),
_gtk_css_value_transition (start->voffset, end->voffset, property_id, progress),
_gtk_css_value_transition (start->radius, end->radius, property_id, progress),
_gtk_css_value_transition (start->spread, end->spread, property_id, progress),
start->inset,
_gtk_css_value_transition (start->color, end->color, property_id, progress));
}
static void
gtk_css_value_shadow_print (const GtkCssValue *shadow,
GString *string)
{
_gtk_css_value_print (shadow->hoffset, string);
g_string_append_c (string, ' ');
_gtk_css_value_print (shadow->voffset, string);
g_string_append_c (string, ' ');
if (_gtk_css_number_value_get (shadow->radius, 100) != 0 ||
_gtk_css_number_value_get (shadow->spread, 100) != 0)
{
_gtk_css_value_print (shadow->radius, string);
g_string_append_c (string, ' ');
}
if (_gtk_css_number_value_get (shadow->spread, 100) != 0)
{
_gtk_css_value_print (shadow->spread, string);
g_string_append_c (string, ' ');
}
_gtk_css_value_print (shadow->color, string);
if (shadow->inset)
g_string_append (string, " inset");
}
static const GtkCssValueClass GTK_CSS_VALUE_SHADOW = {
gtk_css_value_shadow_free,
gtk_css_value_shadow_compute,
gtk_css_value_shadow_equal,
gtk_css_value_shadow_transition,
gtk_css_value_shadow_print
};
static GtkCssValue *
gtk_css_shadow_value_new (GtkCssValue *hoffset,
GtkCssValue *voffset,
GtkCssValue *radius,
GtkCssValue *spread,
gboolean inset,
GtkCssValue *color)
{
GtkCssValue *retval;
retval = _gtk_css_value_new (GtkCssValue, &GTK_CSS_VALUE_SHADOW);
retval->hoffset = hoffset;
retval->voffset = voffset;
retval->radius = radius;
retval->spread = spread;
retval->inset = inset;
retval->color = color;
return retval;
}
GtkCssValue *
_gtk_css_shadow_value_new_for_transition (GtkCssValue *target)
{
GdkRGBA transparent = { 0, 0, 0, 0 };
g_return_val_if_fail (target->class == &GTK_CSS_VALUE_SHADOW, NULL);
return gtk_css_shadow_value_new (_gtk_css_number_value_new (0, GTK_CSS_PX),
_gtk_css_number_value_new (0, GTK_CSS_PX),
_gtk_css_number_value_new (0, GTK_CSS_PX),
_gtk_css_number_value_new (0, GTK_CSS_PX),
target->inset,
_gtk_css_rgba_value_new_from_rgba (&transparent));
}
static gboolean
value_is_done_parsing (GtkCssParser *parser)
{
return _gtk_css_parser_is_eof (parser) ||
_gtk_css_parser_begins_with (parser, ',') ||
_gtk_css_parser_begins_with (parser, ';') ||
_gtk_css_parser_begins_with (parser, '}');
}
GtkCssValue *
_gtk_css_shadow_value_parse (GtkCssParser *parser,
gboolean box_shadow_mode)
{
enum {
HOFFSET,
VOFFSET,
RADIUS,
SPREAD,
COLOR,
N_VALUES
};
GtkCssValue *values[N_VALUES] = { NULL, };
gboolean inset;
guint i;
if (box_shadow_mode)
inset = _gtk_css_parser_try (parser, "inset", TRUE);
else
inset = FALSE;
do
{
if (values[HOFFSET] == NULL &&
_gtk_css_parser_has_number (parser))
{
values[HOFFSET] = _gtk_css_number_value_parse (parser,
GTK_CSS_PARSE_LENGTH
| GTK_CSS_NUMBER_AS_PIXELS);
if (values[HOFFSET] == NULL)
goto fail;
values[VOFFSET] = _gtk_css_number_value_parse (parser,
GTK_CSS_PARSE_LENGTH
| GTK_CSS_NUMBER_AS_PIXELS);
if (values[VOFFSET] == NULL)
goto fail;
if (_gtk_css_parser_has_number (parser))
{
values[RADIUS] = _gtk_css_number_value_parse (parser,
GTK_CSS_PARSE_LENGTH
| GTK_CSS_POSITIVE_ONLY
| GTK_CSS_NUMBER_AS_PIXELS);
if (values[RADIUS] == NULL)
goto fail;
}
else
values[RADIUS] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
if (box_shadow_mode && _gtk_css_parser_has_number (parser))
{
values[SPREAD] = _gtk_css_number_value_parse (parser,
GTK_CSS_PARSE_LENGTH
| GTK_CSS_NUMBER_AS_PIXELS);
if (values[SPREAD] == NULL)
goto fail;
}
else
values[SPREAD] = _gtk_css_number_value_new (0.0, GTK_CSS_PX);
}
else if (!inset && box_shadow_mode && _gtk_css_parser_try (parser, "inset", TRUE))
{
if (values[HOFFSET] == NULL)
goto fail;
inset = TRUE;
break;
}
else if (values[COLOR] == NULL)
{
values[COLOR] = _gtk_css_color_value_parse (parser);
if (values[COLOR] == NULL)
goto fail;
}
else
{
/* We parsed everything and there's still stuff left?
* Pretend we didn't notice and let the normal code produce
* a 'junk at end of value' error */
goto fail;
}
}
while (values[HOFFSET] == NULL || !value_is_done_parsing (parser));
if (values[COLOR] == NULL)
values[COLOR] = _gtk_css_color_value_new_current_color ();
return gtk_css_shadow_value_new (values[HOFFSET], values[VOFFSET],
values[RADIUS], values[SPREAD],
inset, values[COLOR]);
fail:
for (i = 0; i < N_VALUES; i++)
{
if (values[i])
_gtk_css_value_unref (values[i]);
}
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, clip_radius;
radius = _gtk_css_number_value_get (shadow->radius, 0);
if (radius == 0.0)
return cr;
gdk_cairo_get_clip_rectangle (cr, &clip_rect);
clip_radius = _gtk_cairo_blur_compute_pixels (radius);
/* Create a larger surface to center the blur. */
surface = cairo_image_surface_create (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);
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);
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;
}
void
_gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
cairo_t *cr,
PangoLayout *layout)
{
g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
if (!cairo_has_current_point (cr))
cairo_move_to (cr, 0, 0);
cairo_save (cr);
cairo_rel_move_to (cr,
_gtk_css_number_value_get (shadow->hoffset, 0),
_gtk_css_number_value_get (shadow->voffset, 0));
gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
cr = gtk_css_shadow_value_start_drawing (shadow, cr);
_gtk_pango_fill_layout (cr, layout);
cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
cairo_rel_move_to (cr,
- _gtk_css_number_value_get (shadow->hoffset, 0),
- _gtk_css_number_value_get (shadow->voffset, 0));
cairo_restore (cr);
}
void
_gtk_css_shadow_value_paint_icon (const GtkCssValue *shadow,
cairo_t *cr)
{
cairo_pattern_t *pattern;
g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
cairo_save (cr);
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);
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);
cairo_restore (cr);
cairo_pattern_destroy (pattern);
}
void
_gtk_css_shadow_value_paint_spinner (const GtkCssValue *shadow,
cairo_t *cr,
gdouble radius,
gdouble progress)
{
g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
cairo_save (cr);
gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
cr = gtk_css_shadow_value_start_drawing (shadow, cr);
cairo_translate (cr,
_gtk_css_number_value_get (shadow->hoffset, 0),
_gtk_css_number_value_get (shadow->voffset, 0));
_gtk_theming_engine_paint_spinner (cr, radius, progress);
cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
cairo_restore (cr);
}
gboolean
_gtk_css_shadow_value_get_inset (const GtkCssValue *shadow)
{
g_return_val_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW, FALSE);
return shadow->inset;
}
void
_gtk_css_shadow_value_get_geometry (const GtkCssValue *shadow,
gdouble *hoffset,
gdouble *voffset,
gdouble *radius,
gdouble *spread)
{
g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
if (hoffset != NULL)
*hoffset = _gtk_css_number_value_get (shadow->hoffset, 0);
if (voffset != NULL)
*voffset = _gtk_css_number_value_get (shadow->voffset, 0);
if (radius != NULL)
*radius = _gtk_css_number_value_get (shadow->radius, 0);
if (spread != NULL)
*spread = _gtk_css_number_value_get (shadow->spread, 0);
}
static gboolean
has_empty_clip (cairo_t *cr)
{
double x1, y1, x2, y2;
cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
return x1 == x2 && y1 == y2;
}
static void
draw_shadow (const GtkCssValue *shadow,
cairo_t *cr,
GtkRoundedBox *box,
GtkRoundedBox *clip_box,
gboolean blur)
{
cairo_t *shadow_cr;
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);
else
shadow_cr = cr;
cairo_set_fill_rule (shadow_cr, CAIRO_FILL_RULE_EVEN_ODD);
_gtk_rounded_box_path (box, shadow_cr);
if (shadow->inset)
_gtk_rounded_box_clip_path (clip_box, shadow_cr);
cairo_fill (shadow_cr);
if (blur)
gtk_css_shadow_value_finish_drawing (shadow, shadow_cr);
}
void
_gtk_css_shadow_value_paint_box (const GtkCssValue *shadow,
cairo_t *cr,
const GtkRoundedBox *padding_box)
{
GtkRoundedBox box, clip_box;
double spread, radius, clip_radius, x, y, outside;
g_return_if_fail (shadow->class == &GTK_CSS_VALUE_SHADOW);
cairo_save (cr);
spread = _gtk_css_number_value_get (shadow->spread, 0);
radius = _gtk_css_number_value_get (shadow->radius, 0);
clip_radius = _gtk_cairo_blur_compute_pixels (radius);
x = _gtk_css_number_value_get (shadow->hoffset, 0);
y = _gtk_css_number_value_get (shadow->voffset, 0);
if (shadow->inset)
{
_gtk_rounded_box_path (padding_box, cr);
cairo_clip (cr);
}
else
{
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
_gtk_rounded_box_path (padding_box, cr);
outside = spread + clip_radius + MAX (fabs (x), fabs (y));
clip_box = *padding_box;
_gtk_rounded_box_grow (&clip_box, outside, outside, outside, outside);
_gtk_rounded_box_clip_path (&clip_box, cr);
cairo_clip (cr);
}
if (has_empty_clip (cr))
{
cairo_restore (cr);
return;
}
box = *padding_box;
_gtk_rounded_box_move (&box, x, y);
if (shadow->inset)
_gtk_rounded_box_shrink (&box, spread, spread, spread, spread);
else /* Outset */
_gtk_rounded_box_grow (&box, spread, spread, spread, spread);
clip_box = *padding_box;
_gtk_rounded_box_shrink (&clip_box, -clip_radius, -clip_radius, -clip_radius, -clip_radius);
if (radius == 0)
draw_shadow (shadow, cr, &box, &clip_box, FALSE);
else
{
int i, x1, x2, y1, y2;
cairo_region_t *remaining;
cairo_rectangle_int_t r;
/* For the blurred case we divide the rendering into 9 parts,
* 4 of the corners, 4 for the horizonat/vertical lines and
* one for the interior. We make the non-interior parts
* large enought to fit the full radius of the blur, so that
* the interior part can be drawn solidly.
*/
if (shadow->inset)
{
/* In the inset case we want to paint the whole clip-box.
* We could remove the part of "box" where the blur doesn't
* reach, but computing that is a bit tricky since the
* rounded corners are on the "inside" of it. */
r.x = floor (clip_box.box.x);
r.y = floor (clip_box.box.y);
r.width = ceil (clip_box.box.x + clip_box.box.width) - r.x;
r.height = ceil (clip_box.box.y + clip_box.box.height) - r.y;
remaining = cairo_region_create_rectangle (&r);
}
else
{
/* In the outset case we want to paint the entire box, plus as far
* as the radius reaches from it */
r.x = floor (box.box.x - clip_radius);
r.y = floor (box.box.y - clip_radius);
r.width = ceil (box.box.x + box.box.width + clip_radius) - r.x;
r.height = ceil (box.box.y + box.box.height + clip_radius) - r.y;
remaining = cairo_region_create_rectangle (&r);
}
/* First do the corners of box */
for (i = 0; i < 4; i++)
{
if (i == GTK_CSS_TOP_LEFT || i == GTK_CSS_BOTTOM_LEFT)
{
x1 = floor (box.box.x - clip_radius);
x2 = ceil (box.box.x + box.corner[i].horizontal + clip_radius);
}
else
{
x1 = floor (box.box.x + box.box.width - box.corner[i].horizontal - clip_radius);
x2 = ceil (box.box.x + box.box.width + clip_radius);
}
if (i == GTK_CSS_TOP_LEFT || i == GTK_CSS_TOP_RIGHT)
{
y1 = floor (box.box.y - clip_radius);
y2 = ceil (box.box.y + box.corner[i].vertical + clip_radius);
}
else
{
y1 = floor (box.box.y + box.box.height - box.corner[i].vertical - clip_radius);
y2 = ceil (box.box.y + box.box.height + clip_radius);
}
cairo_save (cr);
cairo_rectangle (cr, x1, y1, x2 - x1, y2 - y1);
cairo_clip (cr);
/* 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);
cairo_restore (cr);
/* We drew the region, remove it from remaining */
r.x = x1;
r.y = y1;
r.width = x2 - x1;
r.height = y2 - y1;
cairo_region_subtract_rectangle (remaining, &r);
}
/* Then the sides */
for (i = 0; i < 4; i++)
{
if (i == GTK_CSS_TOP || i == GTK_CSS_BOTTOM)
{
x1 = floor (box.box.x - clip_radius);
x2 = ceil (box.box.x + box.box.width + clip_radius);
}
else if (i == GTK_CSS_LEFT)
{
x1 = floor (box.box.x -clip_radius);
x2 = ceil (box.box.x + clip_radius);
}
else
{
x1 = floor (box.box.x + box.box.width -clip_radius);
x2 = ceil (box.box.x + box.box.width + clip_radius);
}
if (i == GTK_CSS_LEFT || i == GTK_CSS_RIGHT)
{
y1 = floor (box.box.y - clip_radius);
y2 = ceil (box.box.y + box.box.height + clip_radius);
}
else if (i == GTK_CSS_TOP)
{
y1 = floor (box.box.y -clip_radius);
y2 = ceil (box.box.y + clip_radius);
}
else
{
y1 = floor (box.box.y + box.box.height -clip_radius);
y2 = ceil (box.box.y + box.box.height + clip_radius);
}
cairo_save (cr);
cairo_rectangle (cr, x1, y1, x2 - x1, y2 - y1);
cairo_clip (cr);
/* 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);
cairo_restore (cr);
/* We drew the region, remove it from remaining */
r.x = x1;
r.y = y1;
r.width = x2 - x1;
r.height = y2 - y1;
cairo_region_subtract_rectangle (remaining, &r);
}
/* Then the rest, which needs no blurring */
cairo_save (cr);
gdk_cairo_region (cr, remaining);
cairo_clip (cr);
draw_shadow (shadow, cr, &box, &clip_box, FALSE);
cairo_restore (cr);
cairo_region_destroy (remaining);
}
cairo_restore (cr);
}
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