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- /* The GIMP -- an image manipulation program
- * Copyright (C) 1995 Spencer Kimball and Peter Mattis
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
- #include "config.h"
-
- #include <stdlib.h>
-
- #include <glib.h>
-
- #include "apptypes.h"
-
- #include "appenv.h"
- #include "gdisplay.h"
- #include "gdisplay_ops.h"
- #include "gimprc.h"
- #include "nav_window.h"
- #include "scale.h"
- #include "tools.h"
-
- void
- bounds_checking (GDisplay *gdisp)
- {
- gint sx, sy;
-
- sx = SCALEX (gdisp, gdisp->gimage->width);
- sy = SCALEY (gdisp, gdisp->gimage->height);
-
- gdisp->offset_x = CLAMP (gdisp->offset_x, 0,
- LOWPASS (sx - gdisp->disp_width));
-
- gdisp->offset_y = CLAMP (gdisp->offset_y, 0,
- LOWPASS (sy - gdisp->disp_height));
- }
-
-
- void
- resize_display (GDisplay *gdisp,
- gboolean resize_window,
- gboolean redisplay)
- {
- /* freeze the active tool */
- active_tool_control (PAUSE, (void *) gdisp);
-
- if (resize_window)
- gdisplay_shrink_wrap (gdisp);
-
- bounds_checking (gdisp);
- setup_scale (gdisp);
-
- if (resize_window || redisplay)
- {
- gdisplay_expose_full (gdisp);
- gdisplays_flush ();
- /* title may have changed if it includes the zoom ratio */
- gdisplay_update_title (gdisp);
- }
-
- /* re-enable the active tool */
- active_tool_control (RESUME, (void *) gdisp);
- }
-
-
- void
- shrink_wrap_display (GDisplay *gdisp)
- {
- /* freeze the active tool */
- active_tool_control (PAUSE, (void *) gdisp);
-
- gdisplay_shrink_wrap (gdisp);
-
- bounds_checking (gdisp);
- setup_scale (gdisp);
-
- gdisplay_expose_full (gdisp);
- gdisplays_flush ();
-
- /* re-enable the active tool */
- active_tool_control (RESUME, (void *) gdisp);
- }
-
-
- void
- change_scale (GDisplay *gdisp,
- ZoomType zoom_type)
- {
- guchar scalesrc, scaledest;
- gdouble offset_x, offset_y;
- glong sx, sy;
-
- /* user zoom control, so resolution versions not needed -- austin */
- scalesrc = SCALESRC (gdisp);
- scaledest = SCALEDEST (gdisp);
-
- offset_x = gdisp->offset_x + (gdisp->disp_width / 2.0);
- offset_y = gdisp->offset_y + (gdisp->disp_height / 2.0);
-
- offset_x *= ((double) scalesrc / (double) scaledest);
- offset_y *= ((double) scalesrc / (double) scaledest);
-
- switch (zoom_type)
- {
- case ZOOMIN :
- if (scalesrc > 1)
- scalesrc--;
- else
- if (scaledest < 0x10)
- scaledest++;
- else
- return;
- break;
-
- case ZOOMOUT :
- if (scaledest > 1)
- scaledest--;
- else
- if (scalesrc < 0x10)
- scalesrc++;
- else
- return;
- break;
-
- default :
- scalesrc = zoom_type % 100;
- if (scalesrc < 1)
- scalesrc = 1;
- else if (scalesrc > 0x10)
- scalesrc = 0x10;
- scaledest = zoom_type / 100;
- if (scaledest < 1)
- scaledest = 1;
- else if (scaledest > 0x10)
- scaledest = 0x10;
- break;
- }
-
- sx = (gdisp->gimage->width * scaledest) / scalesrc;
- sy = (gdisp->gimage->height * scaledest) / scalesrc;
-
- /* The slider value is a short, so make sure we are within its
- range. If we are trying to scale past it, then stop the scale */
- if (sx < 0xffff && sy < 0xffff)
- {
- gdisp->scale = (scaledest << 8) + scalesrc;
-
- /* set the offsets */
- offset_x *= ((double) scaledest / (double) scalesrc);
- offset_y *= ((double) scaledest / (double) scalesrc);
-
- gdisp->offset_x = (int) (offset_x - (gdisp->disp_width / 2));
- gdisp->offset_y = (int) (offset_y - (gdisp->disp_height / 2));
-
- /* resize the image */
- resize_display (gdisp, allow_resize_windows, TRUE);
- }
- }
-
-
- /* scale image coord to realworld units (cm, inches, pixels) */
- /* 27/Feb/1999 I tried inlining this, but the result was slightly
- * slower (poorer cache locality, probably) -- austin */
- static gdouble
- img2real (GDisplay *gdisp,
- gboolean xdir,
- gdouble a)
- {
- gdouble res;
-
- if (gdisp->dot_for_dot)
- return a;
-
- if (xdir)
- res = gdisp->gimage->xresolution;
- else
- res = gdisp->gimage->yresolution;
-
- return a * gimp_unit_get_factor (gdisp->gimage->unit) / res;
- }
-
-
- void
- setup_scale (GDisplay *gdisp)
- {
- GtkRuler *hruler;
- GtkRuler *vruler;
- gfloat sx, sy;
- gfloat stepx, stepy;
-
- sx = SCALEX (gdisp, gdisp->gimage->width);
- sy = SCALEY (gdisp, gdisp->gimage->height);
- stepx = SCALEFACTOR_X (gdisp);
- stepy = SCALEFACTOR_Y (gdisp);
-
- gdisp->hsbdata->value = gdisp->offset_x;
- gdisp->hsbdata->upper = sx;
- gdisp->hsbdata->page_size = MIN (sx, gdisp->disp_width);
- gdisp->hsbdata->page_increment = (gdisp->disp_width / 2);
- gdisp->hsbdata->step_increment = stepx;
-
- gdisp->vsbdata->value = gdisp->offset_y;
- gdisp->vsbdata->upper = sy;
- gdisp->vsbdata->page_size = MIN (sy, gdisp->disp_height);
- gdisp->vsbdata->page_increment = (gdisp->disp_height / 2);
- gdisp->vsbdata->step_increment = stepy;
-
- gtk_signal_emit_by_name (GTK_OBJECT (gdisp->hsbdata), "changed");
- gtk_signal_emit_by_name (GTK_OBJECT (gdisp->vsbdata), "changed");
-
- hruler = GTK_RULER (gdisp->hrule);
- vruler = GTK_RULER (gdisp->vrule);
-
- hruler->lower = 0;
- hruler->upper = img2real (gdisp, TRUE, FUNSCALEX (gdisp, gdisp->disp_width));
- hruler->max_size = img2real (gdisp, TRUE, MAX (gdisp->gimage->width,
- gdisp->gimage->height));
-
- vruler->lower = 0;
- vruler->upper = img2real(gdisp, FALSE, FUNSCALEY(gdisp, gdisp->disp_height));
- vruler->max_size = img2real (gdisp, FALSE, MAX (gdisp->gimage->width,
- gdisp->gimage->height));
-
- if (sx < gdisp->disp_width)
- {
- gdisp->disp_xoffset = (gdisp->disp_width - sx) / 2;
- hruler->lower -= img2real(gdisp, TRUE,
- FUNSCALEX (gdisp, (double) gdisp->disp_xoffset));
- hruler->upper -= img2real(gdisp, TRUE,
- FUNSCALEX (gdisp, (double) gdisp->disp_xoffset));
- }
- else
- {
- gdisp->disp_xoffset = 0;
- hruler->lower += img2real (gdisp, TRUE,
- FUNSCALEX (gdisp, (double) gdisp->offset_x));
- hruler->upper += img2real (gdisp, TRUE,
- FUNSCALEX (gdisp, (double) gdisp->offset_x));
- }
-
- if (sy < gdisp->disp_height)
- {
- gdisp->disp_yoffset = (gdisp->disp_height - sy) / 2;
- vruler->lower -= img2real(gdisp, FALSE,
- FUNSCALEY (gdisp, (double) gdisp->disp_yoffset));
- vruler->upper -= img2real(gdisp, FALSE,
- FUNSCALEY (gdisp, (double) gdisp->disp_yoffset));
- }
- else
- {
- gdisp->disp_yoffset = 0;
- vruler->lower += img2real (gdisp, FALSE,
- FUNSCALEY (gdisp, (double) gdisp->offset_y));
- vruler->upper += img2real (gdisp, FALSE,
- FUNSCALEY (gdisp, (double) gdisp->offset_y));
- }
-
- gtk_widget_queue_draw (GTK_WIDGET (hruler));
- gtk_widget_queue_draw (GTK_WIDGET (vruler));
-
- nav_window_update_window_marker (gdisp->window_nav_dialog);
- }
-