b3f03d092f
Note that clamping in rounded_box_grow() is not necessary as that function cannot lead to overlap unless the rounded box was overlapping previously. https://bugzilla.gnome.org/show_bug.cgi?id=655009
403 lines
16 KiB
C
403 lines
16 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2011 Benjamin Otte <otte@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "gtkroundedboxprivate.h"
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#include <string.h>
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/**
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* _gtk_rounded_box_init_rect:
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* @box: box to initialize
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* @x: x coordinate of box
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* @y: y coordinate of box
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* @width: width of box
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* @height: height of box
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*
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* Initializes the given @box to represent the given rectangle.
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* The
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**/
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void
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_gtk_rounded_box_init_rect (GtkRoundedBox *box,
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double x,
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double y,
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double width,
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double height)
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{
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box->box.x = x;
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box->box.y = y;
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box->box.width = width;
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box->box.height = height;
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memset (&box->border_radius, 0, sizeof (GtkCssBorderRadius));
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}
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/* clamp border radius, following CSS specs */
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static void
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gtk_rounded_box_clamp_border_radius (GtkRoundedBox *box)
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{
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gdouble factor = 1.0;
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/* note: division by zero leads to +INF, which is > factor, so will be ignored */
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factor = MIN (factor, box->box.width / (box->border_radius.top_left.horizontal +
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box->border_radius.top_right.horizontal));
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factor = MIN (factor, box->box.height / (box->border_radius.top_right.vertical +
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box->border_radius.bottom_right.vertical));
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factor = MIN (factor, box->box.width / (box->border_radius.bottom_right.horizontal +
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box->border_radius.bottom_left.horizontal));
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factor = MIN (factor, box->box.height / (box->border_radius.top_left.vertical +
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box->border_radius.bottom_left.vertical));
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box->border_radius.top_left.horizontal *= factor;
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box->border_radius.top_left.vertical *= factor;
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box->border_radius.top_right.horizontal *= factor;
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box->border_radius.top_right.vertical *= factor;
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box->border_radius.bottom_right.horizontal *= factor;
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box->border_radius.bottom_right.vertical *= factor;
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box->border_radius.bottom_left.horizontal *= factor;
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box->border_radius.bottom_left.vertical *= factor;
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}
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void
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_gtk_rounded_box_apply_border_radius (GtkRoundedBox *box,
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GtkThemingEngine *engine,
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GtkStateFlags state,
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GtkJunctionSides junction)
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{
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GtkCssBorderCornerRadius *top_left_radius, *top_right_radius;
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GtkCssBorderCornerRadius *bottom_left_radius, *bottom_right_radius;
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gtk_theming_engine_get (engine, state,
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/* Can't use border-radius as it's an int for
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* backwards compat */
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"border-top-left-radius", &top_left_radius,
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"border-top-right-radius", &top_right_radius,
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"border-bottom-right-radius", &bottom_right_radius,
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"border-bottom-left-radius", &bottom_left_radius,
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NULL);
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if (top_left_radius && (junction & GTK_JUNCTION_CORNER_TOPLEFT) == 0)
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box->border_radius.top_left = *top_left_radius;
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if (top_right_radius && (junction & GTK_JUNCTION_CORNER_TOPRIGHT) == 0)
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box->border_radius.top_right = *top_right_radius;
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if (bottom_right_radius && (junction & GTK_JUNCTION_CORNER_BOTTOMRIGHT) == 0)
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box->border_radius.bottom_right = *bottom_right_radius;
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if (bottom_left_radius && (junction & GTK_JUNCTION_CORNER_BOTTOMLEFT) == 0)
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box->border_radius.bottom_left = *bottom_left_radius;
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gtk_rounded_box_clamp_border_radius (box);
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g_free (top_left_radius);
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g_free (top_right_radius);
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g_free (bottom_right_radius);
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g_free (bottom_left_radius);
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}
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static void
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gtk_css_border_radius_grow (GtkCssBorderCornerRadius *corner,
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double horizontal,
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double vertical)
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{
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corner->horizontal += horizontal;
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corner->vertical += vertical;
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if (corner->horizontal <= 0 || corner->vertical <= 0)
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{
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corner->horizontal = 0;
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corner->vertical = 0;
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}
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}
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void
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_gtk_rounded_box_grow (GtkRoundedBox *box,
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double top,
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double right,
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double bottom,
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double left)
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{
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if (box->box.width + left + right < 0)
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{
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box->box.x -= left * box->box.width / (left + right);
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box->box.width = 0;
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}
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else
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{
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box->box.x -= left;
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box->box.width += left + right;
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}
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if (box->box.height + bottom + right < 0)
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{
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box->box.y -= top * box->box.height / (top + bottom);
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box->box.height = 0;
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}
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else
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{
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box->box.y -= top;
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box->box.height += top + bottom;
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}
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gtk_css_border_radius_grow (&box->border_radius.top_left, left, top);
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gtk_css_border_radius_grow (&box->border_radius.top_right, right, bottom);
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gtk_css_border_radius_grow (&box->border_radius.bottom_right, right, top);
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gtk_css_border_radius_grow (&box->border_radius.bottom_left, left, bottom);
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}
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void
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_gtk_rounded_box_shrink (GtkRoundedBox *box,
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double top,
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double right,
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double bottom,
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double left)
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{
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_gtk_rounded_box_grow (box, -top, -right, -bottom, -left);
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}
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void
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_gtk_rounded_box_move (GtkRoundedBox *box,
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double dx,
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double dy)
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{
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box->box.x += dx;
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box->box.y += dy;
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}
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static void
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_cairo_ellipsis (cairo_t *cr,
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double xc, double yc,
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double xradius, double yradius,
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double angle1, double angle2)
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{
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if (xradius <= 0.0 || yradius <= 0.0)
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{
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cairo_line_to (cr, xc, yc);
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return;
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}
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cairo_save (cr);
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cairo_translate (cr, xc, yc);
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cairo_scale (cr, xradius, yradius);
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cairo_arc (cr, 0, 0, 1.0, angle1, angle2);
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cairo_restore (cr);
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}
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static void
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_cairo_ellipsis_negative (cairo_t *cr,
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double xc, double yc,
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double xradius, double yradius,
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double angle1, double angle2)
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{
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if (xradius <= 0.0 || yradius <= 0.0)
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{
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cairo_line_to (cr, xc, yc);
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return;
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}
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cairo_save (cr);
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cairo_translate (cr, xc, yc);
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cairo_scale (cr, xradius, yradius);
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cairo_arc_negative (cr, 0, 0, 1.0, angle1, angle2);
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cairo_restore (cr);
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}
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void
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_gtk_rounded_box_path (const GtkRoundedBox *box,
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cairo_t *cr)
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{
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cairo_new_sub_path (cr);
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_cairo_ellipsis (cr,
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box->box.x + box->border_radius.top_left.horizontal,
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box->box.y + box->border_radius.top_left.vertical,
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box->border_radius.top_left.horizontal,
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box->border_radius.top_left.vertical,
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G_PI, 3 * G_PI / 2);
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_cairo_ellipsis (cr,
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box->box.x + box->box.width - box->border_radius.top_right.horizontal,
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box->box.y + box->border_radius.top_right.vertical,
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box->border_radius.top_right.horizontal,
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box->border_radius.top_right.vertical,
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- G_PI / 2, 0);
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_cairo_ellipsis (cr,
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box->box.x + box->box.width - box->border_radius.bottom_right.horizontal,
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box->box.y + box->box.height - box->border_radius.bottom_right.vertical,
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box->border_radius.bottom_right.horizontal,
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box->border_radius.bottom_right.vertical,
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0, G_PI / 2);
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_cairo_ellipsis (cr,
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box->box.x + box->border_radius.bottom_left.horizontal,
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box->box.y + box->box.height - box->border_radius.bottom_left.vertical,
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box->border_radius.bottom_left.horizontal,
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box->border_radius.bottom_left.vertical,
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G_PI / 2, G_PI);
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}
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void
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_gtk_rounded_box_path_top (const GtkRoundedBox *outer,
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const GtkRoundedBox *inner,
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cairo_t *cr)
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{
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cairo_new_sub_path (cr);
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_cairo_ellipsis (cr,
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outer->box.x + outer->border_radius.top_left.horizontal,
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outer->box.y + outer->border_radius.top_left.vertical,
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outer->border_radius.top_left.horizontal,
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outer->border_radius.top_left.vertical,
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5 * G_PI / 4, 3 * G_PI / 2);
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_cairo_ellipsis (cr,
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outer->box.x + outer->box.width - outer->border_radius.top_right.horizontal,
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outer->box.y + outer->border_radius.top_right.vertical,
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outer->border_radius.top_right.horizontal,
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outer->border_radius.top_right.vertical,
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- G_PI / 2, -G_PI / 4);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->box.width - inner->border_radius.top_right.horizontal,
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inner->box.y + inner->border_radius.top_right.vertical,
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inner->border_radius.top_right.horizontal,
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inner->border_radius.top_right.vertical,
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-G_PI / 4, - G_PI / 2);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->border_radius.top_left.horizontal,
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inner->box.y + inner->border_radius.top_left.vertical,
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inner->border_radius.top_left.horizontal,
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inner->border_radius.top_left.vertical,
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3 * G_PI / 2, 5 * G_PI / 4);
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cairo_close_path (cr);
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}
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void
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_gtk_rounded_box_path_right (const GtkRoundedBox *outer,
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const GtkRoundedBox *inner,
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cairo_t *cr)
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{
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cairo_new_sub_path (cr);
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_cairo_ellipsis (cr,
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outer->box.x + outer->box.width - outer->border_radius.top_right.horizontal,
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outer->box.y + outer->border_radius.top_right.vertical,
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outer->border_radius.top_right.horizontal,
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outer->border_radius.top_right.vertical,
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- G_PI / 4, 0);
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_cairo_ellipsis (cr,
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outer->box.x + outer->box.width - outer->border_radius.bottom_right.horizontal,
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outer->box.y + outer->box.height - outer->border_radius.bottom_right.vertical,
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outer->border_radius.bottom_right.horizontal,
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outer->border_radius.bottom_right.vertical,
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0, G_PI / 4);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->box.width - inner->border_radius.bottom_right.horizontal,
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inner->box.y + inner->box.height - inner->border_radius.bottom_right.vertical,
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inner->border_radius.bottom_right.horizontal,
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inner->border_radius.bottom_right.vertical,
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G_PI / 4, 0);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->box.width - inner->border_radius.top_right.horizontal,
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inner->box.y + inner->border_radius.top_right.vertical,
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inner->border_radius.top_right.horizontal,
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inner->border_radius.top_right.vertical,
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0, - G_PI / 4);
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cairo_close_path (cr);
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}
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void
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_gtk_rounded_box_path_bottom (const GtkRoundedBox *outer,
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const GtkRoundedBox *inner,
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cairo_t *cr)
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{
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cairo_new_sub_path (cr);
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_cairo_ellipsis (cr,
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outer->box.x + outer->box.width - outer->border_radius.bottom_right.horizontal,
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outer->box.y + outer->box.height - outer->border_radius.bottom_right.vertical,
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outer->border_radius.bottom_right.horizontal,
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outer->border_radius.bottom_right.vertical,
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G_PI / 4, G_PI / 2);
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_cairo_ellipsis (cr,
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outer->box.x + outer->border_radius.bottom_left.horizontal,
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outer->box.y + outer->box.height - outer->border_radius.bottom_left.vertical,
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outer->border_radius.bottom_left.horizontal,
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outer->border_radius.bottom_left.vertical,
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G_PI / 2, 3 * G_PI / 4);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->border_radius.bottom_left.horizontal,
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inner->box.y + inner->box.height - inner->border_radius.bottom_left.vertical,
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inner->border_radius.bottom_left.horizontal,
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inner->border_radius.bottom_left.vertical,
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3 * G_PI / 4, G_PI / 2);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->box.width - inner->border_radius.bottom_right.horizontal,
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inner->box.y + inner->box.height - inner->border_radius.bottom_right.vertical,
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inner->border_radius.bottom_right.horizontal,
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inner->border_radius.bottom_right.vertical,
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G_PI / 2, G_PI / 4);
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cairo_close_path (cr);
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}
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void
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_gtk_rounded_box_path_left (const GtkRoundedBox *outer,
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const GtkRoundedBox *inner,
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cairo_t *cr)
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{
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cairo_new_sub_path (cr);
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_cairo_ellipsis (cr,
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outer->box.x + outer->border_radius.bottom_left.horizontal,
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outer->box.y + outer->box.height - outer->border_radius.bottom_left.vertical,
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outer->border_radius.bottom_left.horizontal,
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outer->border_radius.bottom_left.vertical,
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3 * G_PI / 4, G_PI);
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_cairo_ellipsis (cr,
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outer->box.x + outer->border_radius.top_left.horizontal,
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outer->box.y + outer->border_radius.top_left.vertical,
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outer->border_radius.top_left.horizontal,
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outer->border_radius.top_left.vertical,
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G_PI, 5 * G_PI / 4);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->border_radius.top_left.horizontal,
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inner->box.y + inner->border_radius.top_left.vertical,
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inner->border_radius.top_left.horizontal,
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inner->border_radius.top_left.vertical,
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5 * G_PI / 4, G_PI);
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_cairo_ellipsis_negative (cr,
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inner->box.x + inner->border_radius.bottom_left.horizontal,
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inner->box.y + inner->box.height - inner->border_radius.bottom_left.vertical,
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inner->border_radius.bottom_left.horizontal,
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inner->border_radius.bottom_left.vertical,
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G_PI, 3 * G_PI / 4);
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cairo_close_path (cr);
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}
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void
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_gtk_rounded_box_clip_path (const GtkRoundedBox *box,
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cairo_t *cr)
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{
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cairo_rectangle (cr,
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box->box.x, box->box.y,
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box->box.width, box->box.height);
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}
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