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gtk2/gtk/gtkroundedbox.c
Benjamin Otte 3078b180fe Replace "gdouble" with "double"
2020-07-25 00:47:36 +02:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 Benjamin Otte <otte@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 "gtkroundedboxprivate.h"
#include "gtkcsscornervalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcsstypesprivate.h"
#include "gtkstylecontextprivate.h"
#include <string.h>
/**
* _gtk_rounded_box_init_rect:
* @box: box to initialize
* @x: x coordinate of box
* @y: y coordinate of box
* @width: width of box
* @height: height of box
*
* Initializes the given @box to represent the given rectangle.
* The
**/
void
_gtk_rounded_box_init_rect (GskRoundedRect *box,
double x,
double y,
double width,
double height)
{
memset (box, 0, sizeof (GskRoundedRect));
box->bounds.origin.x = x;
box->bounds.origin.y = y;
box->bounds.size.width = width;
box->bounds.size.height = height;
}
/* clamp border radius, following CSS specs */
static void
gtk_rounded_box_clamp_border_radius (GskRoundedRect *box)
{
double factor = 1.0;
double corners;
corners = box->corner[GSK_CORNER_TOP_LEFT].width + box->corner[GSK_CORNER_TOP_RIGHT].width;
if (corners != 0)
factor = MIN (factor, box->bounds.size.width / corners);
corners = box->corner[GSK_CORNER_TOP_RIGHT].height + box->corner[GSK_CORNER_BOTTOM_RIGHT].height;
if (corners != 0)
factor = MIN (factor, box->bounds.size.height / corners);
corners = box->corner[GSK_CORNER_BOTTOM_RIGHT].width + box->corner[GSK_CORNER_BOTTOM_LEFT].width;
if (corners != 0)
factor = MIN (factor, box->bounds.size.width / corners);
corners = box->corner[GSK_CORNER_TOP_LEFT].height + box->corner[GSK_CORNER_BOTTOM_LEFT].height;
if (corners != 0)
factor = MIN (factor, box->bounds.size.height / corners);
box->corner[GSK_CORNER_TOP_LEFT].width *= factor;
box->corner[GSK_CORNER_TOP_LEFT].height *= factor;
box->corner[GSK_CORNER_TOP_RIGHT].width *= factor;
box->corner[GSK_CORNER_TOP_RIGHT].height *= factor;
box->corner[GSK_CORNER_BOTTOM_RIGHT].width *= factor;
box->corner[GSK_CORNER_BOTTOM_RIGHT].height *= factor;
box->corner[GSK_CORNER_BOTTOM_LEFT].width *= factor;
box->corner[GSK_CORNER_BOTTOM_LEFT].height *= factor;
}
static void
_gtk_rounded_box_apply_border_radius (GskRoundedRect *box,
const GtkCssValue * const corner[4])
{
box->corner[GSK_CORNER_TOP_LEFT].width = _gtk_css_corner_value_get_x (corner[GSK_CORNER_TOP_LEFT],
box->bounds.size.width);
box->corner[GSK_CORNER_TOP_LEFT].height = _gtk_css_corner_value_get_y (corner[GSK_CORNER_TOP_LEFT],
box->bounds.size.height);
box->corner[GSK_CORNER_TOP_RIGHT].width = _gtk_css_corner_value_get_x (corner[GSK_CORNER_TOP_RIGHT],
box->bounds.size.width);
box->corner[GSK_CORNER_TOP_RIGHT].height = _gtk_css_corner_value_get_y (corner[GSK_CORNER_TOP_RIGHT],
box->bounds.size.height);
box->corner[GSK_CORNER_BOTTOM_RIGHT].width = _gtk_css_corner_value_get_x (corner[GSK_CORNER_BOTTOM_RIGHT],
box->bounds.size.width);
box->corner[GSK_CORNER_BOTTOM_RIGHT].height = _gtk_css_corner_value_get_y (corner[GSK_CORNER_BOTTOM_RIGHT],
box->bounds.size.height);
box->corner[GSK_CORNER_BOTTOM_LEFT].width = _gtk_css_corner_value_get_x (corner[GSK_CORNER_BOTTOM_LEFT],
box->bounds.size.width);
box->corner[GSK_CORNER_BOTTOM_LEFT].height = _gtk_css_corner_value_get_y (corner[GSK_CORNER_BOTTOM_LEFT],
box->bounds.size.height);
gtk_rounded_box_clamp_border_radius (box);
}
void
gtk_rounded_boxes_init_for_style (GskRoundedRect *border_box,
GskRoundedRect *padding_box,
GskRoundedRect *content_box,
GtkCssStyle *style,
double x,
double y,
double width,
double height)
{
const GtkCssValue *corner[4];
GskRoundedRect box;
gsk_rounded_rect_init_from_rect (&box, &GRAPHENE_RECT_INIT (x, y, width, height), 0);
corner[GSK_CORNER_TOP_LEFT] = style->border->border_top_left_radius;
corner[GSK_CORNER_TOP_RIGHT] = style->border->border_top_right_radius;
corner[GSK_CORNER_BOTTOM_LEFT] = style->border->border_bottom_left_radius;
corner[GSK_CORNER_BOTTOM_RIGHT] = style->border->border_bottom_right_radius;
_gtk_rounded_box_apply_border_radius (&box, corner);
if (border_box)
gsk_rounded_rect_init_copy (border_box, &box);
if (padding_box || content_box)
{
gsk_rounded_rect_shrink (&box,
_gtk_css_number_value_get (style->border->border_top_width, 100),
_gtk_css_number_value_get (style->border->border_right_width, 100),
_gtk_css_number_value_get (style->border->border_bottom_width, 100),
_gtk_css_number_value_get (style->border->border_left_width, 100));
if (padding_box)
gsk_rounded_rect_init_copy (padding_box, &box);
if (content_box)
{
gsk_rounded_rect_shrink (&box,
_gtk_css_number_value_get (style->size->padding_top, 100),
_gtk_css_number_value_get (style->size->padding_right, 100),
_gtk_css_number_value_get (style->size->padding_bottom, 100),
_gtk_css_number_value_get (style->size->padding_left, 100));
gsk_rounded_rect_init_copy (content_box, &box);
}
}
}
typedef struct {
double angle1;
double angle2;
gboolean negative;
} Arc;
static inline guint
mem_hash (gconstpointer v, int len)
{
const signed char *p;
const signed char *end;
guint32 h = 5381;
p = v;
end = p + len;
for (; p < end; p++)
h = (h << 5) + h + *p;
return h;
}
static guint
arc_path_hash (Arc *arc)
{
return mem_hash ((gconstpointer)arc, sizeof (Arc));
}
static gboolean
arc_path_equal (Arc *arc1,
Arc *arc2)
{
return arc1->angle1 == arc2->angle1 &&
arc1->angle2 == arc2->angle2 &&
arc1->negative == arc2->negative;
}
/* We need the path to start with a line-to */
static cairo_path_t *
fixup_path (cairo_path_t *path)
{
cairo_path_data_t *data;
data = &path->data[0];
if (data->header.type == CAIRO_PATH_MOVE_TO)
data->header.type = CAIRO_PATH_LINE_TO;
return path;
}
static void
append_arc (cairo_t *cr, double angle1, double angle2, gboolean negative)
{
static GHashTable *arc_path_cache;
Arc key;
cairo_path_t *arc;
memset (&key, 0, sizeof (Arc));
key.angle1 = angle1;
key.angle2 = angle2;
key.negative = negative;
if (arc_path_cache == NULL)
arc_path_cache = g_hash_table_new_full ((GHashFunc)arc_path_hash,
(GEqualFunc)arc_path_equal,
g_free, (GDestroyNotify)cairo_path_destroy);
arc = g_hash_table_lookup (arc_path_cache, &key);
if (arc == NULL)
{
cairo_surface_t *surface;
cairo_t *tmp;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
tmp = cairo_create (surface);
if (negative)
cairo_arc_negative (tmp, 0.0, 0.0, 1.0, angle1, angle2);
else
cairo_arc (tmp, 0.0, 0.0, 1.0, angle1, angle2);
arc = fixup_path (cairo_copy_path (tmp));
g_hash_table_insert (arc_path_cache, g_memdup (&key, sizeof (key)), arc);
cairo_destroy (tmp);
cairo_surface_destroy (surface);
}
cairo_append_path (cr, arc);
}
static void
_cairo_ellipsis (cairo_t *cr,
double xc, double yc,
double xradius, double yradius,
double angle1, double angle2)
{
cairo_matrix_t save;
if (xradius <= 0.0 || yradius <= 0.0)
{
cairo_line_to (cr, xc, yc);
return;
}
cairo_get_matrix (cr, &save);
cairo_translate (cr, xc, yc);
cairo_scale (cr, xradius, yradius);
append_arc (cr, angle1, angle2, FALSE);
cairo_set_matrix (cr, &save);
}
static void
_cairo_ellipsis_negative (cairo_t *cr,
double xc, double yc,
double xradius, double yradius,
double angle1, double angle2)
{
cairo_matrix_t save;
if (xradius <= 0.0 || yradius <= 0.0)
{
cairo_line_to (cr, xc, yc);
return;
}
cairo_get_matrix (cr, &save);
cairo_translate (cr, xc, yc);
cairo_scale (cr, xradius, yradius);
append_arc (cr, angle1, angle2, TRUE);
cairo_set_matrix (cr, &save);
}
double
_gtk_rounded_box_guess_length (const GskRoundedRect *box,
GtkCssSide side)
{
double length;
GtkCssSide before, after;
before = side;
after = (side + 1) % 4;
if (side & 1)
length = box->bounds.size.height
- box->corner[before].height
- box->corner[after].height;
else
length = box->bounds.size.width
- box->corner[before].width
- box->corner[after].width;
length += G_PI * 0.125 * (box->corner[before].width
+ box->corner[before].height
+ box->corner[after].width
+ box->corner[after].height);
return length;
}
void
_gtk_rounded_box_path_side (const GskRoundedRect *box,
cairo_t *cr,
GtkCssSide side)
{
switch (side)
{
case GTK_CSS_TOP:
_cairo_ellipsis (cr,
box->bounds.origin.x + box->corner[GSK_CORNER_TOP_LEFT].width,
box->bounds.origin.y + box->corner[GSK_CORNER_TOP_LEFT].height,
box->corner[GSK_CORNER_TOP_LEFT].width,
box->corner[GSK_CORNER_TOP_LEFT].height,
5 * G_PI_4, 3 * G_PI_2);
_cairo_ellipsis (cr,
box->bounds.origin.x + box->bounds.size.width - box->corner[GSK_CORNER_TOP_RIGHT].width,
box->bounds.origin.y + box->corner[GSK_CORNER_TOP_RIGHT].height,
box->corner[GSK_CORNER_TOP_RIGHT].width,
box->corner[GSK_CORNER_TOP_RIGHT].height,
- G_PI_2, -G_PI_4);
break;
case GTK_CSS_RIGHT:
_cairo_ellipsis (cr,
box->bounds.origin.x + box->bounds.size.width - box->corner[GSK_CORNER_TOP_RIGHT].width,
box->bounds.origin.y + box->corner[GSK_CORNER_TOP_RIGHT].height,
box->corner[GSK_CORNER_TOP_RIGHT].width,
box->corner[GSK_CORNER_TOP_RIGHT].height,
- G_PI_4, 0);
_cairo_ellipsis (cr,
box->bounds.origin.x + box->bounds.size.width - box->corner[GSK_CORNER_BOTTOM_RIGHT].width,
box->bounds.origin.y + box->bounds.size.height - box->corner[GSK_CORNER_BOTTOM_RIGHT].height,
box->corner[GSK_CORNER_BOTTOM_RIGHT].width,
box->corner[GSK_CORNER_BOTTOM_RIGHT].height,
0, G_PI_4);
break;
case GTK_CSS_BOTTOM:
_cairo_ellipsis (cr,
box->bounds.origin.x + box->bounds.size.width - box->corner[GSK_CORNER_BOTTOM_RIGHT].width,
box->bounds.origin.y + box->bounds.size.height - box->corner[GSK_CORNER_BOTTOM_RIGHT].height,
box->corner[GSK_CORNER_BOTTOM_RIGHT].width,
box->corner[GSK_CORNER_BOTTOM_RIGHT].height,
G_PI_4, G_PI_2);
_cairo_ellipsis (cr,
box->bounds.origin.x + box->corner[GSK_CORNER_BOTTOM_LEFT].width,
box->bounds.origin.y + box->bounds.size.height - box->corner[GSK_CORNER_BOTTOM_LEFT].height,
box->corner[GSK_CORNER_BOTTOM_LEFT].width,
box->corner[GSK_CORNER_BOTTOM_LEFT].height,
G_PI_2, 3 * G_PI_4);
break;
case GTK_CSS_LEFT:
_cairo_ellipsis (cr,
box->bounds.origin.x + box->corner[GSK_CORNER_BOTTOM_LEFT].width,
box->bounds.origin.y + box->bounds.size.height - box->corner[GSK_CORNER_BOTTOM_LEFT].height,
box->corner[GSK_CORNER_BOTTOM_LEFT].width,
box->corner[GSK_CORNER_BOTTOM_LEFT].height,
3 * G_PI_4, G_PI);
_cairo_ellipsis (cr,
box->bounds.origin.x + box->corner[GSK_CORNER_TOP_LEFT].width,
box->bounds.origin.y + box->corner[GSK_CORNER_TOP_LEFT].height,
box->corner[GSK_CORNER_TOP_LEFT].width,
box->corner[GSK_CORNER_TOP_LEFT].height,
G_PI, 5 * G_PI_4);
break;
default:
g_assert_not_reached ();
break;
}
}
void
_gtk_rounded_box_path_top (const GskRoundedRect *outer,
const GskRoundedRect *inner,
cairo_t *cr)
{
double start_angle, middle_angle, end_angle;
if (outer->bounds.origin.y == inner->bounds.origin.y)
return;
if (outer->bounds.origin.x == inner->bounds.origin.x)
start_angle = G_PI;
else
start_angle = 5 * G_PI_4;
middle_angle = 3 * G_PI_2;
if (outer->bounds.origin.x + outer->bounds.size.width == inner->bounds.origin.x + inner->bounds.size.width)
end_angle = 0;
else
end_angle = 7 * G_PI_4;
cairo_new_sub_path (cr);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->corner[GSK_CORNER_TOP_LEFT].width,
outer->bounds.origin.y + outer->corner[GSK_CORNER_TOP_LEFT].height,
outer->corner[GSK_CORNER_TOP_LEFT].width,
outer->corner[GSK_CORNER_TOP_LEFT].height,
start_angle, middle_angle);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->bounds.size.width - outer->corner[GSK_CORNER_TOP_RIGHT].width,
outer->bounds.origin.y + outer->corner[GSK_CORNER_TOP_RIGHT].height,
outer->corner[GSK_CORNER_TOP_RIGHT].width,
outer->corner[GSK_CORNER_TOP_RIGHT].height,
middle_angle, end_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->bounds.size.width - inner->corner[GSK_CORNER_TOP_RIGHT].width,
inner->bounds.origin.y + inner->corner[GSK_CORNER_TOP_RIGHT].height,
inner->corner[GSK_CORNER_TOP_RIGHT].width,
inner->corner[GSK_CORNER_TOP_RIGHT].height,
end_angle, middle_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->corner[GSK_CORNER_TOP_LEFT].width,
inner->bounds.origin.y + inner->corner[GSK_CORNER_TOP_LEFT].height,
inner->corner[GSK_CORNER_TOP_LEFT].width,
inner->corner[GSK_CORNER_TOP_LEFT].height,
middle_angle, start_angle);
cairo_close_path (cr);
}
void
_gtk_rounded_box_path_right (const GskRoundedRect *outer,
const GskRoundedRect *inner,
cairo_t *cr)
{
double start_angle, middle_angle, end_angle;
if (outer->bounds.origin.x + outer->bounds.size.width == inner->bounds.origin.x + inner->bounds.size.width)
return;
if (outer->bounds.origin.y == inner->bounds.origin.y)
start_angle = 3 * G_PI_2;
else
start_angle = 7 * G_PI_4;
middle_angle = 0;
if (outer->bounds.origin.y + outer->bounds.size.height == inner->bounds.origin.y + inner->bounds.size.height)
end_angle = G_PI_2;
else
end_angle = G_PI_4;
cairo_new_sub_path (cr);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->bounds.size.width - outer->corner[GSK_CORNER_TOP_RIGHT].width,
outer->bounds.origin.y + outer->corner[GSK_CORNER_TOP_RIGHT].height,
outer->corner[GSK_CORNER_TOP_RIGHT].width,
outer->corner[GSK_CORNER_TOP_RIGHT].height,
start_angle, middle_angle);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->bounds.size.width - outer->corner[GSK_CORNER_BOTTOM_RIGHT].width,
outer->bounds.origin.y + outer->bounds.size.height - outer->corner[GSK_CORNER_BOTTOM_RIGHT].height,
outer->corner[GSK_CORNER_BOTTOM_RIGHT].width,
outer->corner[GSK_CORNER_BOTTOM_RIGHT].height,
middle_angle, end_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->bounds.size.width - inner->corner[GSK_CORNER_BOTTOM_RIGHT].width,
inner->bounds.origin.y + inner->bounds.size.height - inner->corner[GSK_CORNER_BOTTOM_RIGHT].height,
inner->corner[GSK_CORNER_BOTTOM_RIGHT].width,
inner->corner[GSK_CORNER_BOTTOM_RIGHT].height,
end_angle, middle_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->bounds.size.width - inner->corner[GSK_CORNER_TOP_RIGHT].width,
inner->bounds.origin.y + inner->corner[GSK_CORNER_TOP_RIGHT].height,
inner->corner[GSK_CORNER_TOP_RIGHT].width,
inner->corner[GSK_CORNER_TOP_RIGHT].height,
middle_angle, start_angle);
cairo_close_path (cr);
}
void
_gtk_rounded_box_path_bottom (const GskRoundedRect *outer,
const GskRoundedRect *inner,
cairo_t *cr)
{
double start_angle, middle_angle, end_angle;
if (outer->bounds.origin.y + outer->bounds.size.height == inner->bounds.origin.y + inner->bounds.size.height)
return;
if (outer->bounds.origin.x + outer->bounds.size.width == inner->bounds.origin.x + inner->bounds.size.width)
start_angle = 0;
else
start_angle = G_PI_4;
middle_angle = G_PI_2;
if (outer->bounds.origin.x == inner->bounds.origin.x)
end_angle = G_PI;
else
end_angle = 3 * G_PI_4;
cairo_new_sub_path (cr);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->bounds.size.width - outer->corner[GSK_CORNER_BOTTOM_RIGHT].width,
outer->bounds.origin.y + outer->bounds.size.height - outer->corner[GSK_CORNER_BOTTOM_RIGHT].height,
outer->corner[GSK_CORNER_BOTTOM_RIGHT].width,
outer->corner[GSK_CORNER_BOTTOM_RIGHT].height,
start_angle, middle_angle);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->corner[GSK_CORNER_BOTTOM_LEFT].width,
outer->bounds.origin.y + outer->bounds.size.height - outer->corner[GSK_CORNER_BOTTOM_LEFT].height,
outer->corner[GSK_CORNER_BOTTOM_LEFT].width,
outer->corner[GSK_CORNER_BOTTOM_LEFT].height,
middle_angle, end_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->corner[GSK_CORNER_BOTTOM_LEFT].width,
inner->bounds.origin.y + inner->bounds.size.height - inner->corner[GSK_CORNER_BOTTOM_LEFT].height,
inner->corner[GSK_CORNER_BOTTOM_LEFT].width,
inner->corner[GSK_CORNER_BOTTOM_LEFT].height,
end_angle, middle_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->bounds.size.width - inner->corner[GSK_CORNER_BOTTOM_RIGHT].width,
inner->bounds.origin.y + inner->bounds.size.height - inner->corner[GSK_CORNER_BOTTOM_RIGHT].height,
inner->corner[GSK_CORNER_BOTTOM_RIGHT].width,
inner->corner[GSK_CORNER_BOTTOM_RIGHT].height,
middle_angle, start_angle);
cairo_close_path (cr);
}
void
_gtk_rounded_box_path_left (const GskRoundedRect *outer,
const GskRoundedRect *inner,
cairo_t *cr)
{
double start_angle, middle_angle, end_angle;
if (outer->bounds.origin.x == inner->bounds.origin.x)
return;
if (outer->bounds.origin.y + outer->bounds.size.height == inner->bounds.origin.y + inner->bounds.size.height)
start_angle = G_PI_2;
else
start_angle = 3 * G_PI_4;
middle_angle = G_PI;
if (outer->bounds.origin.y == inner->bounds.origin.y)
end_angle = 3 * G_PI_2;
else
end_angle = 5 * G_PI_4;
cairo_new_sub_path (cr);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->corner[GSK_CORNER_BOTTOM_LEFT].width,
outer->bounds.origin.y + outer->bounds.size.height - outer->corner[GSK_CORNER_BOTTOM_LEFT].height,
outer->corner[GSK_CORNER_BOTTOM_LEFT].width,
outer->corner[GSK_CORNER_BOTTOM_LEFT].height,
start_angle, middle_angle);
_cairo_ellipsis (cr,
outer->bounds.origin.x + outer->corner[GSK_CORNER_TOP_LEFT].width,
outer->bounds.origin.y + outer->corner[GSK_CORNER_TOP_LEFT].height,
outer->corner[GSK_CORNER_TOP_LEFT].width,
outer->corner[GSK_CORNER_TOP_LEFT].height,
middle_angle, end_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->corner[GSK_CORNER_TOP_LEFT].width,
inner->bounds.origin.y + inner->corner[GSK_CORNER_TOP_LEFT].height,
inner->corner[GSK_CORNER_TOP_LEFT].width,
inner->corner[GSK_CORNER_TOP_LEFT].height,
end_angle, middle_angle);
_cairo_ellipsis_negative (cr,
inner->bounds.origin.x + inner->corner[GSK_CORNER_BOTTOM_LEFT].width,
inner->bounds.origin.y + inner->bounds.size.height - inner->corner[GSK_CORNER_BOTTOM_LEFT].height,
inner->corner[GSK_CORNER_BOTTOM_LEFT].width,
inner->corner[GSK_CORNER_BOTTOM_LEFT].height,
middle_angle, start_angle);
cairo_close_path (cr);
}
void
_gtk_rounded_box_clip_path (const GskRoundedRect *box,
cairo_t *cr)
{
cairo_rectangle (cr,
box->bounds.origin.x, box->bounds.origin.y,
box->bounds.size.width, box->bounds.size.height);
}
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