jean
/
Learning_GTK4_tree
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Learning_GTK4_tree/gtk/gtkcssimageradial.c

751 lines
22 KiB
C
Raw Permalink Blame History

/*
* Copyright © 2015 Red Hat Inc.
*
* 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 2.1 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/>.
*
* Authors: Matthias Clasen <mclasen@redhat.com>
*/
#include "config.h"
#include "gtkcssimageradialprivate.h"
#include <math.h>
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcsspositionvalueprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssprovider.h"
G_DEFINE_TYPE (GtkCssImageRadial, _gtk_css_image_radial, GTK_TYPE_CSS_IMAGE)
static void
gtk_css_image_radial_get_start_end (GtkCssImageRadial *radial,
double radius,
double *start,
double *end)
{
const GtkCssImageRadialColorStop *stop;
double pos;
guint i;
if (radial->repeating)
{
stop = &radial->color_stops[0];
if (stop->offset == NULL)
*start = 0;
else
*start = _gtk_css_number_value_get (stop->offset, radius) / radius;
*end = *start;
for (i = 0; i < radial->n_stops; i++)
{
stop = &radial->color_stops[i];
if (stop->offset == NULL)
continue;
pos = _gtk_css_number_value_get (stop->offset, radius) / radius;
*end = MAX (pos, *end);
}
if (stop->offset == NULL)
*end = MAX (*end, 1.0);
}
else
{
*start = 0;
*end = 1;
}
}
static void
gtk_css_image_radial_snapshot (GtkCssImage *image,
GtkSnapshot *snapshot,
double width,
double height)
{
GtkCssImageRadial *radial = GTK_CSS_IMAGE_RADIAL (image);
GskColorStop *stops;
double x, y;
double hradius, vradius;
double start, end;
double r1, r2, r3, r4, r;
double offset;
int i, last;
x = _gtk_css_position_value_get_x (radial->position, width);
y = _gtk_css_position_value_get_y (radial->position, height);
if (radial->circle)
{
switch (radial->size)
{
case GTK_CSS_EXPLICIT_SIZE:
hradius = _gtk_css_number_value_get (radial->sizes[0], width);
break;
case GTK_CSS_CLOSEST_SIDE:
hradius = MIN (MIN (x, width - x), MIN (y, height - y));
break;
case GTK_CSS_FARTHEST_SIDE:
hradius = MAX (MAX (x, width - x), MAX (y, height - y));
break;
case GTK_CSS_CLOSEST_CORNER:
case GTK_CSS_FARTHEST_CORNER:
r1 = x*x + y*y;
r2 = x*x + (height - y)*(height - y);
r3 = (width - x)*(width - x) + y*y;
r4 = (width - x)*(width - x) + (height - y)*(height - y);
if (radial->size == GTK_CSS_CLOSEST_CORNER)
r = MIN ( MIN (r1, r2), MIN (r3, r4));
else
r = MAX ( MAX (r1, r2), MAX (r3, r4));
hradius = sqrt (r);
break;
default:
g_assert_not_reached ();
}
hradius = MAX (1.0, hradius);
vradius = hradius;
}
else
{
switch (radial->size)
{
case GTK_CSS_EXPLICIT_SIZE:
hradius = _gtk_css_number_value_get (radial->sizes[0], width);
vradius = _gtk_css_number_value_get (radial->sizes[1], height);
break;
case GTK_CSS_CLOSEST_SIDE:
hradius = MIN (x, width - x);
vradius = MIN (y, height - y);
break;
case GTK_CSS_FARTHEST_SIDE:
hradius = MAX (x, width - x);
vradius = MAX (y, height - y);
break;
case GTK_CSS_CLOSEST_CORNER:
hradius = M_SQRT2 * MIN (x, width - x);
vradius = M_SQRT2 * MIN (y, height - y);
break;
case GTK_CSS_FARTHEST_CORNER:
hradius = M_SQRT2 * MAX (x, width - x);
vradius = M_SQRT2 * MAX (y, height - y);
break;
default:
g_assert_not_reached ();
}
hradius = MAX (1.0, hradius);
vradius = MAX (1.0, vradius);
}
gtk_css_image_radial_get_start_end (radial, hradius, &start, &end);
offset = start;
last = -1;
stops = g_newa (GskColorStop, radial->n_stops);
for (i = 0; i < radial->n_stops; i++)
{
const GtkCssImageRadialColorStop *stop = &radial->color_stops[i];
double pos, step;
if (stop->offset == NULL)
{
if (i == 0)
pos = 0.0;
else if (i + 1 == radial->n_stops)
pos = 1.0;
else
continue;
}
else
pos = MIN (1.0, _gtk_css_number_value_get (stop->offset, hradius) / hradius);
pos = MAX (pos, offset);
step = (pos - offset) / (i - last);
for (last = last + 1; last <= i; last++)
{
stop = &radial->color_stops[last];
offset += step;
stops[last].offset = (offset - start) / (end - start);
stops[last].color = *gtk_css_color_value_get_rgba (stop->color);
}
offset = pos;
last = i;
}
if (radial->repeating)
gtk_snapshot_append_repeating_radial_gradient (snapshot,
&GRAPHENE_RECT_INIT (0, 0, width, height),
&GRAPHENE_POINT_INIT (x, y),
hradius,
vradius,
start,
end,
stops,
radial->n_stops);
else
gtk_snapshot_append_radial_gradient (snapshot,
&GRAPHENE_RECT_INIT (0, 0, width, height),
&GRAPHENE_POINT_INIT (x, y),
hradius,
vradius,
start,
end,
stops,
radial->n_stops);
}
static guint
gtk_css_image_radial_parse_color_stop (GtkCssImageRadial *radial,
GtkCssParser *parser,
GArray *stop_array)
{
GtkCssImageRadialColorStop stop;
stop.color = _gtk_css_color_value_parse (parser);
if (stop.color == NULL)
return 0;
if (gtk_css_number_value_can_parse (parser))
{
stop.offset = _gtk_css_number_value_parse (parser,
GTK_CSS_PARSE_PERCENT
| GTK_CSS_PARSE_LENGTH);
if (stop.offset == NULL)
{
_gtk_css_value_unref (stop.color);
return 0;
}
}
else
{
stop.offset = NULL;
}
g_array_append_val (stop_array, stop);
return 1;
}
static guint
gtk_css_image_radial_parse_first_arg (GtkCssImageRadial *radial,
GtkCssParser *parser,
GArray *stop_array)
{
gboolean has_shape = FALSE;
gboolean has_size = FALSE;
gboolean found_one = FALSE;
guint i;
static struct {
const char *name;
guint value;
} names[] = {
{ "closest-side", GTK_CSS_CLOSEST_SIDE },
{ "farthest-side", GTK_CSS_FARTHEST_SIDE },
{ "closest-corner", GTK_CSS_CLOSEST_CORNER },
{ "farthest-corner", GTK_CSS_FARTHEST_CORNER }
};
found_one = FALSE;
do {
if (!has_shape && gtk_css_parser_try_ident (parser, "circle"))
{
radial->circle = TRUE;
found_one = has_shape = TRUE;
}
else if (!has_shape && gtk_css_parser_try_ident (parser, "ellipse"))
{
radial->circle = FALSE;
found_one = has_shape = TRUE;
}
else if (!has_size)
{
for (i = 0; i < G_N_ELEMENTS (names); i++)
{
if (gtk_css_parser_try_ident (parser, names[i].name))
{
found_one = has_size = TRUE;
radial->size = names[i].value;
break;
}
}
if (!has_size && gtk_css_number_value_can_parse (parser))
{
radial->sizes[0] = _gtk_css_number_value_parse (parser, GTK_CSS_PARSE_LENGTH | GTK_CSS_PARSE_PERCENT);
if (radial->sizes[0] == NULL)
return 0;
if (gtk_css_number_value_can_parse (parser))
{
radial->sizes[1] = _gtk_css_number_value_parse (parser, GTK_CSS_PARSE_LENGTH | GTK_CSS_PARSE_PERCENT);
if (radial->sizes[1] == NULL)
return 0;
}
found_one = has_size = TRUE;
}
if (!has_size)
break;
}
else
{
break;
}
} while (!(has_shape && has_size));
if (gtk_css_parser_try_ident (parser, "at"))
{
radial->position = _gtk_css_position_value_parse (parser);
if (!radial->position)
return 0;
found_one = TRUE;
}
else
{
radial->position = _gtk_css_position_value_new (_gtk_css_number_value_new (50, GTK_CSS_PERCENT),
_gtk_css_number_value_new (50, GTK_CSS_PERCENT));
}
if (!has_size)
{
radial->size = GTK_CSS_FARTHEST_CORNER;
}
if (!has_shape)
{
if (radial->sizes[0] && !radial->sizes[1])
radial->circle = TRUE;
else
radial->circle = FALSE;
}
if (has_shape && radial->circle)
{
if (radial->sizes[0] && radial->sizes[1])
{
gtk_css_parser_error_syntax (parser, "Circular gradient can only have one size");
return 0;
}
if (radial->sizes[0] && gtk_css_number_value_has_percent (radial->sizes[0]))
{
gtk_css_parser_error_syntax (parser, "Circular gradient cannot have percentage as size");
return 0;
}
}
if (has_size && !radial->circle)
{
if (radial->sizes[0] && !radial->sizes[1])
radial->sizes[1] = _gtk_css_value_ref (radial->sizes[0]);
}
if (found_one)
return 1;
if (!gtk_css_image_radial_parse_color_stop (radial, parser, stop_array))
return 0;
return 2;
}
typedef struct
{
GtkCssImageRadial *self;
GArray *stop_array;
} ParseData;
static guint
gtk_css_image_radial_parse_arg (GtkCssParser *parser,
guint arg,
gpointer user_data)
{
ParseData *parse_data = user_data;
GtkCssImageRadial *self = parse_data->self;
if (arg == 0)
return gtk_css_image_radial_parse_first_arg (self, parser, parse_data->stop_array);
else
return gtk_css_image_radial_parse_color_stop (self, parser, parse_data->stop_array);
}
static gboolean
gtk_css_image_radial_parse (GtkCssImage *image,
GtkCssParser *parser)
{
GtkCssImageRadial *self = GTK_CSS_IMAGE_RADIAL (image);
ParseData parse_data;
gboolean success;
if (gtk_css_parser_has_function (parser, "repeating-radial-gradient"))
self->repeating = TRUE;
else if (gtk_css_parser_has_function (parser, "radial-gradient"))
self->repeating = FALSE;
else
{
gtk_css_parser_error_syntax (parser, "Not a radial gradient");
return FALSE;
}
parse_data.self = self;
parse_data.stop_array = g_array_new (TRUE, FALSE, sizeof (GtkCssImageRadialColorStop));
success = gtk_css_parser_consume_function (parser, 3, G_MAXUINT, gtk_css_image_radial_parse_arg, &parse_data);
if (!success)
{
g_array_free (parse_data.stop_array, TRUE);
}
else
{
self->n_stops = parse_data.stop_array->len;
self->color_stops = (GtkCssImageRadialColorStop *)g_array_free (parse_data.stop_array, FALSE);
}
return success;
}
static void
gtk_css_image_radial_print (GtkCssImage *image,
GString *string)
{
GtkCssImageRadial *radial = GTK_CSS_IMAGE_RADIAL (image);
guint i;
const char *names[] = {
NULL,
"closest-side",
"farthest-side",
"closest-corner",
"farthest-corner"
};
if (radial->repeating)
g_string_append (string, "repeating-radial-gradient(");
else
g_string_append (string, "radial-gradient(");
if (radial->circle)
g_string_append (string, "circle ");
else
g_string_append (string, "ellipse ");
if (radial->size != 0)
g_string_append (string, names[radial->size]);
else
{
if (radial->sizes[0])
_gtk_css_value_print (radial->sizes[0], string);
if (radial->sizes[1])
{
g_string_append (string, " ");
_gtk_css_value_print (radial->sizes[1], string);
}
}
g_string_append (string, " at ");
_gtk_css_value_print (radial->position, string);
g_string_append (string, ", ");
for (i = 0; i < radial->n_stops; i++)
{
const GtkCssImageRadialColorStop *stop = &radial->color_stops[i];
if (i > 0)
g_string_append (string, ", ");
_gtk_css_value_print (stop->color, string);
if (stop->offset)
{
g_string_append (string, " ");
_gtk_css_value_print (stop->offset, string);
}
}
g_string_append (string, ")");
}
static GtkCssImage *
gtk_css_image_radial_compute (GtkCssImage *image,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssImageRadial *radial = GTK_CSS_IMAGE_RADIAL (image);
GtkCssImageRadial *copy;
guint i;
copy = g_object_new (GTK_TYPE_CSS_IMAGE_RADIAL, NULL);
copy->repeating = radial->repeating;
copy->circle = radial->circle;
copy->size = radial->size;
copy->position = _gtk_css_value_compute (radial->position, property_id, provider, style, parent_style);
if (radial->sizes[0])
copy->sizes[0] = _gtk_css_value_compute (radial->sizes[0], property_id, provider, style, parent_style);
if (radial->sizes[1])
copy->sizes[1] = _gtk_css_value_compute (radial->sizes[1], property_id, provider, style, parent_style);
copy->n_stops = radial->n_stops;
copy->color_stops = g_malloc (sizeof (GtkCssImageRadialColorStop) * copy->n_stops);
for (i = 0; i < radial->n_stops; i++)
{
const GtkCssImageRadialColorStop *stop = &radial->color_stops[i];
GtkCssImageRadialColorStop *scopy = &copy->color_stops[i];
scopy->color = _gtk_css_value_compute (stop->color, property_id, provider, style, parent_style);
if (stop->offset)
{
scopy->offset = _gtk_css_value_compute (stop->offset, property_id, provider, style, parent_style);
}
else
{
scopy->offset = NULL;
}
}
return GTK_CSS_IMAGE (copy);
}
static GtkCssImage *
gtk_css_image_radial_transition (GtkCssImage *start_image,
GtkCssImage *end_image,
guint property_id,
double progress)
{
GtkCssImageRadial *start, *end, *result;
guint i;
start = GTK_CSS_IMAGE_RADIAL (start_image);
if (end_image == NULL)
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_radial_parent_class)->transition (start_image, end_image, property_id, progress);
if (!GTK_IS_CSS_IMAGE_RADIAL (end_image))
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_radial_parent_class)->transition (start_image, end_image, property_id, progress);
end = GTK_CSS_IMAGE_RADIAL (end_image);
if (start->repeating != end->repeating ||
start->n_stops != end->n_stops ||
start->size != end->size ||
start->circle != end->circle)
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_radial_parent_class)->transition (start_image, end_image, property_id, progress);
result = g_object_new (GTK_TYPE_CSS_IMAGE_RADIAL, NULL);
result->repeating = start->repeating;
result->circle = start->circle;
result->size = start->size;
result->position = _gtk_css_value_transition (start->position, end->position, property_id, progress);
if (result->position == NULL)
goto fail;
if (start->sizes[0] && end->sizes[0])
{
result->sizes[0] = _gtk_css_value_transition (start->sizes[0], end->sizes[0], property_id, progress);
if (result->sizes[0] == NULL)
goto fail;
}
else
result->sizes[0] = 0;
if (start->sizes[1] && end->sizes[1])
{
result->sizes[1] = _gtk_css_value_transition (start->sizes[1], end->sizes[1], property_id, progress);
if (result->sizes[1] == NULL)
goto fail;
}
else
result->sizes[1] = 0;
result->color_stops = g_malloc (sizeof (GtkCssImageRadialColorStop) * start->n_stops);
result->n_stops = 0;
for (i = 0; i < start->n_stops; i++)
{
const GtkCssImageRadialColorStop *start_stop = &start->color_stops[i];
const GtkCssImageRadialColorStop *end_stop = &end->color_stops[i];
GtkCssImageRadialColorStop *stop = &result->color_stops[i];
if ((start_stop->offset != NULL) != (end_stop->offset != NULL))
goto fail;
if (start_stop->offset == NULL)
{
stop->offset = NULL;
}
else
{
stop->offset = _gtk_css_value_transition (start_stop->offset,
end_stop->offset,
property_id,
progress);
if (stop->offset == NULL)
goto fail;
}
stop->color = _gtk_css_value_transition (start_stop->color,
end_stop->color,
property_id,
progress);
if (stop->color == NULL)
{
if (stop->offset)
_gtk_css_value_unref (stop->offset);
goto fail;
}
result->n_stops++;
}
return GTK_CSS_IMAGE (result);
fail:
g_object_unref (result);
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_radial_parent_class)->transition (start_image, end_image, property_id, progress);
}
static gboolean
gtk_css_image_radial_equal (GtkCssImage *image1,
GtkCssImage *image2)
{
GtkCssImageRadial *radial1 = (GtkCssImageRadial *) image1;
GtkCssImageRadial *radial2 = (GtkCssImageRadial *) image2;
guint i;
if (radial1->repeating != radial2->repeating ||
radial1->size != radial2->size ||
!_gtk_css_value_equal (radial1->position, radial2->position) ||
((radial1->sizes[0] == NULL) != (radial2->sizes[0] == NULL)) ||
(radial1->sizes[0] && radial2->sizes[0] && !_gtk_css_value_equal (radial1->sizes[0], radial2->sizes[0])) ||
((radial1->sizes[1] == NULL) != (radial2->sizes[1] == NULL)) ||
(radial1->sizes[1] && radial2->sizes[1] && !_gtk_css_value_equal (radial1->sizes[1], radial2->sizes[1])) ||
radial1->n_stops != radial2->n_stops)
return FALSE;
for (i = 0; i < radial1->n_stops; i++)
{
const GtkCssImageRadialColorStop *stop1 = &radial1->color_stops[i];
const GtkCssImageRadialColorStop *stop2 = &radial2->color_stops[i];
if (!_gtk_css_value_equal0 (stop1->offset, stop2->offset) ||
!_gtk_css_value_equal (stop1->color, stop2->color))
return FALSE;
}
return TRUE;
}
static void
gtk_css_image_radial_dispose (GObject *object)
{
GtkCssImageRadial *radial = GTK_CSS_IMAGE_RADIAL (object);
guint i;
for (i = 0; i < radial->n_stops; i ++)
{
GtkCssImageRadialColorStop *stop = &radial->color_stops[i];
_gtk_css_value_unref (stop->color);
if (stop->offset)
_gtk_css_value_unref (stop->offset);
}
g_free (radial->color_stops);
if (radial->position)
{
_gtk_css_value_unref (radial->position);
radial->position = NULL;
}
for (i = 0; i < 2; i++)
if (radial->sizes[i])
{
_gtk_css_value_unref (radial->sizes[i]);
radial->sizes[i] = NULL;
}
G_OBJECT_CLASS (_gtk_css_image_radial_parent_class)->dispose (object);
}
static gboolean
gtk_css_image_radial_is_computed (GtkCssImage *image)
{
GtkCssImageRadial *radial = GTK_CSS_IMAGE_RADIAL (image);
guint i;
gboolean computed = TRUE;
computed = computed && (!radial->position || gtk_css_value_is_computed (radial->position));
computed = computed && (!radial->sizes[0] || gtk_css_value_is_computed (radial->sizes[0]));
computed = computed && (!radial->sizes[1] || gtk_css_value_is_computed (radial->sizes[1]));
if (computed)
for (i = 0; i < radial->n_stops; i ++)
{
const GtkCssImageRadialColorStop *stop = &radial->color_stops[i];
if (stop->offset && !gtk_css_value_is_computed (stop->offset))
{
computed = FALSE;
break;
}
if (!gtk_css_value_is_computed (stop->color))
{
computed = FALSE;
break;
}
}
return computed;
}
static void
_gtk_css_image_radial_class_init (GtkCssImageRadialClass *klass)
{
GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
image_class->snapshot = gtk_css_image_radial_snapshot;
image_class->parse = gtk_css_image_radial_parse;
image_class->print = gtk_css_image_radial_print;
image_class->compute = gtk_css_image_radial_compute;
image_class->transition = gtk_css_image_radial_transition;
image_class->equal = gtk_css_image_radial_equal;
image_class->is_computed = gtk_css_image_radial_is_computed;
object_class->dispose = gtk_css_image_radial_dispose;
}
static void
_gtk_css_image_radial_init (GtkCssImageRadial *radial)
{
}
Reference in New Issue View Git Blame Copy Permalink