mirror of https://github.com/GNOME/gimp.git
283 lines
8.8 KiB
C
283 lines
8.8 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <gtk/gtk.h>
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#include "display-types.h"
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#include "base/boundary.h"
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#include "core/gimpdrawable.h"
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#include "core/gimpimage.h"
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#include "gimpdisplay.h"
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#include "gimpdisplayshell.h"
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#include "gimpdisplayshell-transform.h"
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void
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gimp_display_shell_transform_coords (GimpDisplayShell *shell,
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GimpCoords *image_coords,
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GimpCoords *display_coords)
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{
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gdouble scalex;
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gdouble scaley;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (image_coords != NULL);
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g_return_if_fail (display_coords != NULL);
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*display_coords = *image_coords;
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scalex = SCALEFACTOR_X (shell);
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scaley = SCALEFACTOR_Y (shell);
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display_coords->x = scalex * image_coords->x;
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display_coords->y = scaley * image_coords->y;
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display_coords->x += - shell->offset_x + shell->disp_xoffset;
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display_coords->y += - shell->offset_y + shell->disp_yoffset;
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}
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void
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gimp_display_shell_untransform_coords (GimpDisplayShell *shell,
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GimpCoords *display_coords,
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GimpCoords *image_coords)
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{
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gdouble scalex;
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gdouble scaley;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (display_coords != NULL);
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g_return_if_fail (image_coords != NULL);
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*image_coords = *display_coords;
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scalex = SCALEFACTOR_X (shell);
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scaley = SCALEFACTOR_Y (shell);
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image_coords->x = display_coords->x - shell->disp_xoffset + shell->offset_x;
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image_coords->y = display_coords->y - shell->disp_yoffset + shell->offset_y;
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image_coords->x /= scalex;
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image_coords->y /= scaley;
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}
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void
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gimp_display_shell_transform_xy (GimpDisplayShell *shell,
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gint x,
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gint y,
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gint *nx,
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gint *ny,
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gboolean use_offsets)
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{
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gdouble scalex;
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gdouble scaley;
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gint offset_x = 0;
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gint offset_y = 0;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (nx != NULL);
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g_return_if_fail (ny != NULL);
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/* transform from image coordinates to screen coordinates */
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scalex = SCALEFACTOR_X (shell);
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scaley = SCALEFACTOR_Y (shell);
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if (use_offsets)
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gimp_item_offsets (GIMP_ITEM (gimp_image_active_drawable (shell->gdisp->gimage)),
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&offset_x, &offset_y);
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*nx = (gint) (scalex * (x + offset_x) - shell->offset_x);
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*ny = (gint) (scaley * (y + offset_y) - shell->offset_y);
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*nx += shell->disp_xoffset;
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*ny += shell->disp_yoffset;
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}
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void
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gimp_display_shell_untransform_xy (GimpDisplayShell *shell,
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gint x,
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gint y,
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gint *nx,
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gint *ny,
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gboolean round,
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gboolean use_offsets)
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{
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gdouble scalex;
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gdouble scaley;
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gint offset_x = 0;
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gint offset_y = 0;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (nx != NULL);
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g_return_if_fail (ny != NULL);
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x -= shell->disp_xoffset;
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y -= shell->disp_yoffset;
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/* transform from screen coordinates to image coordinates */
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scalex = SCALEFACTOR_X (shell);
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scaley = SCALEFACTOR_Y (shell);
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if (use_offsets)
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gimp_item_offsets (GIMP_ITEM (gimp_image_active_drawable (shell->gdisp->gimage)),
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&offset_x, &offset_y);
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if (round)
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{
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*nx = ROUND ((x + shell->offset_x) / scalex - offset_x);
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*ny = ROUND ((y + shell->offset_y) / scaley - offset_y);
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}
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else
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{
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*nx = (gint) ((x + shell->offset_x) / scalex - offset_x);
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*ny = (gint) ((y + shell->offset_y) / scaley - offset_y);
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}
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}
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void
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gimp_display_shell_transform_xy_f (GimpDisplayShell *shell,
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gdouble x,
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gdouble y,
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gdouble *nx,
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gdouble *ny,
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gboolean use_offsets)
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{
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gdouble scalex;
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gdouble scaley;
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gint offset_x = 0;
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gint offset_y = 0;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (nx != NULL);
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g_return_if_fail (ny != NULL);
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/* transform from gimp coordinates to screen coordinates */
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scalex = SCALEFACTOR_X (shell);
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scaley = SCALEFACTOR_Y (shell);
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if (use_offsets)
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gimp_item_offsets (GIMP_ITEM (gimp_image_active_drawable (shell->gdisp->gimage)),
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&offset_x, &offset_y);
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*nx = scalex * (x + offset_x) - shell->offset_x;
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*ny = scaley * (y + offset_y) - shell->offset_y;
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*nx += shell->disp_xoffset;
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*ny += shell->disp_yoffset;
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}
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void
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gimp_display_shell_untransform_xy_f (GimpDisplayShell *shell,
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gdouble x,
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gdouble y,
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gdouble *nx,
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gdouble *ny,
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gboolean use_offsets)
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{
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gdouble scalex;
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gdouble scaley;
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gint offset_x = 0;
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gint offset_y = 0;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (nx != NULL);
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g_return_if_fail (ny != NULL);
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x -= shell->disp_xoffset;
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y -= shell->disp_yoffset;
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/* transform from screen coordinates to gimp coordinates */
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scalex = SCALEFACTOR_X (shell);
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scaley = SCALEFACTOR_Y (shell);
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if (use_offsets)
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gimp_item_offsets (GIMP_ITEM (gimp_image_active_drawable (shell->gdisp->gimage)),
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&offset_x, &offset_y);
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*nx = (x + shell->offset_x) / scalex - offset_x;
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*ny = (y + shell->offset_y) / scaley - offset_y;
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}
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GdkSegment *
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gimp_display_shell_transform_boundary (GimpDisplayShell *shell,
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BoundSeg *bound_segs,
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gint n_bound_segs,
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gint offset_x,
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gint offset_y)
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{
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GdkSegment *dest_segs;
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gint x, y;
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gint xclamp, yclamp;
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gint i;
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g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
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g_return_val_if_fail (n_bound_segs > 0 || bound_segs == NULL, NULL);
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dest_segs = g_new0 (GdkSegment, n_bound_segs);
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xclamp = shell->disp_width + 1;
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yclamp = shell->disp_height + 1;
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for (i = 0; i < n_bound_segs; i++)
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{
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gimp_display_shell_transform_xy (shell,
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bound_segs[i].x1 + offset_x,
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bound_segs[i].y1 + offset_y,
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&x, &y,
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FALSE);
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dest_segs[i].x1 = CLAMP (x, -1, xclamp);
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dest_segs[i].y1 = CLAMP (y, -1, yclamp);
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gimp_display_shell_transform_xy (shell,
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bound_segs[i].x2 + offset_x,
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bound_segs[i].y2 + offset_y,
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&x, &y,
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FALSE);
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dest_segs[i].x2 = CLAMP (x, -1, xclamp);
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dest_segs[i].y2 = CLAMP (y, -1, yclamp);
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/* If this segment is a closing segment && the segments lie inside
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* the region, OR if this is an opening segment and the segments
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* lie outside the region...
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* we need to transform it by one display pixel
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*/
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if (! bound_segs[i].open)
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{
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/* If it is vertical */
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if (dest_segs[i].x1 == dest_segs[i].x2)
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{
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dest_segs[i].x1 -= 1;
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dest_segs[i].x2 -= 1;
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}
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else
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{
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dest_segs[i].y1 -= 1;
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dest_segs[i].y2 -= 1;
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}
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}
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}
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return dest_segs;
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}
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