mirror of https://github.com/GNOME/gimp.git
268 lines
7.0 KiB
C
268 lines
7.0 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 <stdlib.h>
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#include "appenv.h"
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#include "gdisplay.h"
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#include "gdisplay_ops.h"
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#include "gimprc.h"
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#include "nav_window.h"
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#include "scale.h"
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#include "tools.h"
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void
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bounds_checking (GDisplay *gdisp)
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{
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gint sx, sy;
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sx = SCALEX (gdisp, gdisp->gimage->width);
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sy = SCALEY (gdisp, gdisp->gimage->height);
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gdisp->offset_x = CLAMP (gdisp->offset_x, 0,
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LOWPASS (sx - gdisp->disp_width));
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gdisp->offset_y = CLAMP (gdisp->offset_y, 0,
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LOWPASS (sy - gdisp->disp_height));
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}
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void
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resize_display (GDisplay *gdisp,
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gboolean resize_window,
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gboolean redisplay)
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{
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/* freeze the active tool */
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active_tool_control (PAUSE, (void *) gdisp);
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if (resize_window)
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gdisplay_shrink_wrap (gdisp);
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bounds_checking (gdisp);
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setup_scale (gdisp);
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if (resize_window || redisplay)
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{
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gdisplay_expose_full (gdisp);
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gdisplays_flush ();
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/* title may have changed if it includes the zoom ratio */
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gdisplay_update_title (gdisp);
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}
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/* re-enable the active tool */
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active_tool_control (RESUME, (void *) gdisp);
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}
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void
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shrink_wrap_display (GDisplay *gdisp)
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{
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/* freeze the active tool */
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active_tool_control (PAUSE, (void *) gdisp);
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gdisplay_shrink_wrap (gdisp);
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bounds_checking (gdisp);
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setup_scale (gdisp);
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gdisplay_expose_full (gdisp);
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gdisplays_flush ();
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/* re-enable the active tool */
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active_tool_control (RESUME, (void *) gdisp);
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}
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void
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change_scale (GDisplay *gdisp,
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ZoomType zoom_type)
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{
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guchar scalesrc, scaledest;
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gdouble offset_x, offset_y;
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glong sx, sy;
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/* user zoom control, so resolution versions not needed -- austin */
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scalesrc = SCALESRC (gdisp);
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scaledest = SCALEDEST (gdisp);
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offset_x = gdisp->offset_x + (gdisp->disp_width / 2.0);
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offset_y = gdisp->offset_y + (gdisp->disp_height / 2.0);
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offset_x *= ((double) scalesrc / (double) scaledest);
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offset_y *= ((double) scalesrc / (double) scaledest);
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switch (zoom_type)
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{
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case ZOOMIN :
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if (scalesrc > 1)
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scalesrc--;
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else
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if (scaledest < 0x10)
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scaledest++;
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else
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return;
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break;
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case ZOOMOUT :
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if (scaledest > 1)
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scaledest--;
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else
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if (scalesrc < 0x10)
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scalesrc++;
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else
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return;
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break;
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default :
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scalesrc = zoom_type % 100;
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if (scalesrc < 1)
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scalesrc = 1;
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else if (scalesrc > 0x10)
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scalesrc = 0x10;
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scaledest = zoom_type / 100;
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if (scaledest < 1)
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scaledest = 1;
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else if (scaledest > 0x10)
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scaledest = 0x10;
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break;
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}
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sx = (gdisp->gimage->width * scaledest) / scalesrc;
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sy = (gdisp->gimage->height * scaledest) / scalesrc;
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/* The slider value is a short, so make sure we are within its
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range. If we are trying to scale past it, then stop the scale */
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if (sx < 0xffff && sy < 0xffff)
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{
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gdisp->scale = (scaledest << 8) + scalesrc;
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/* set the offsets */
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offset_x *= ((double) scaledest / (double) scalesrc);
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offset_y *= ((double) scaledest / (double) scalesrc);
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gdisp->offset_x = (int) (offset_x - (gdisp->disp_width / 2));
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gdisp->offset_y = (int) (offset_y - (gdisp->disp_height / 2));
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/* resize the image */
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resize_display (gdisp, allow_resize_windows, TRUE);
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}
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}
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/* scale image coord to realworld units (cm, inches, pixels) */
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/* 27/Feb/1999 I tried inlining this, but the result was slightly
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* slower (poorer cache locality, probably) -- austin */
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static gdouble
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img2real (GDisplay *gdisp,
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gboolean xdir,
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gdouble a)
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{
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gdouble res;
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if (gdisp->dot_for_dot)
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return a;
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if (xdir)
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res = gdisp->gimage->xresolution;
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else
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res = gdisp->gimage->yresolution;
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return a * gimp_unit_get_factor (gdisp->gimage->unit) / res;
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}
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void
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setup_scale (GDisplay *gdisp)
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{
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GtkRuler *hruler;
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GtkRuler *vruler;
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gfloat sx, sy;
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gfloat stepx, stepy;
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sx = SCALEX (gdisp, gdisp->gimage->width);
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sy = SCALEY (gdisp, gdisp->gimage->height);
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stepx = SCALEFACTOR_X (gdisp);
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stepy = SCALEFACTOR_Y (gdisp);
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gdisp->hsbdata->value = gdisp->offset_x;
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gdisp->hsbdata->upper = sx;
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gdisp->hsbdata->page_size = MIN (sx, gdisp->disp_width);
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gdisp->hsbdata->page_increment = (gdisp->disp_width / 2);
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gdisp->hsbdata->step_increment = stepx;
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gdisp->vsbdata->value = gdisp->offset_y;
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gdisp->vsbdata->upper = sy;
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gdisp->vsbdata->page_size = MIN (sy, gdisp->disp_height);
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gdisp->vsbdata->page_increment = (gdisp->disp_height / 2);
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gdisp->vsbdata->step_increment = stepy;
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gtk_signal_emit_by_name (GTK_OBJECT (gdisp->hsbdata), "changed");
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gtk_signal_emit_by_name (GTK_OBJECT (gdisp->vsbdata), "changed");
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hruler = GTK_RULER (gdisp->hrule);
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vruler = GTK_RULER (gdisp->vrule);
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hruler->lower = 0;
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hruler->upper = img2real (gdisp, TRUE, FUNSCALEX (gdisp, gdisp->disp_width));
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hruler->max_size = img2real (gdisp, TRUE, MAX (gdisp->gimage->width,
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gdisp->gimage->height));
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vruler->lower = 0;
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vruler->upper = img2real(gdisp, FALSE, FUNSCALEY(gdisp, gdisp->disp_height));
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vruler->max_size = img2real (gdisp, FALSE, MAX (gdisp->gimage->width,
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gdisp->gimage->height));
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if (sx < gdisp->disp_width)
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{
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gdisp->disp_xoffset = (gdisp->disp_width - sx) / 2;
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hruler->lower -= img2real(gdisp, TRUE,
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FUNSCALEX (gdisp, (double) gdisp->disp_xoffset));
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hruler->upper -= img2real(gdisp, TRUE,
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FUNSCALEX (gdisp, (double) gdisp->disp_xoffset));
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}
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else
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{
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gdisp->disp_xoffset = 0;
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hruler->lower += img2real (gdisp, TRUE,
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FUNSCALEX (gdisp, (double) gdisp->offset_x));
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hruler->upper += img2real (gdisp, TRUE,
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FUNSCALEX (gdisp, (double) gdisp->offset_x));
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}
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if (sy < gdisp->disp_height)
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{
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gdisp->disp_yoffset = (gdisp->disp_height - sy) / 2;
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vruler->lower -= img2real(gdisp, FALSE,
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FUNSCALEY (gdisp, (double) gdisp->disp_yoffset));
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vruler->upper -= img2real(gdisp, FALSE,
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FUNSCALEY (gdisp, (double) gdisp->disp_yoffset));
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}
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else
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{
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gdisp->disp_yoffset = 0;
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vruler->lower += img2real (gdisp, FALSE,
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FUNSCALEY (gdisp, (double) gdisp->offset_y));
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vruler->upper += img2real (gdisp, FALSE,
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FUNSCALEY (gdisp, (double) gdisp->offset_y));
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}
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gtk_widget_queue_draw (GTK_WIDGET (hruler));
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gtk_widget_queue_draw (GTK_WIDGET (vruler));
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nav_window_update_window_marker (gdisp->window_nav_dialog);
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}
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