gimp/app/scale.c

227 lines
5.8 KiB
C

/* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include "appenv.h"
#include "errors.h"
#include "gdisplay.h"
#include "gdisplay_ops.h"
#include "gimprc.h"
#include "info_window.h"
#include "scale.h"
#include "tools.h"
void
bounds_checking (GDisplay *gdisp)
{
int sx, sy;
sx = SCALE(gdisp, gdisp->gimage->width);
sy = SCALE(gdisp, gdisp->gimage->height);
gdisp->offset_x = BOUNDS (gdisp->offset_x, 0,
LOWPASS (sx - gdisp->disp_width));
gdisp->offset_y = BOUNDS (gdisp->offset_y, 0,
LOWPASS (sy - gdisp->disp_height));
}
void
resize_display (GDisplay *gdisp,
int resize_window,
int 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 (redisplay)
{
gdisplay_expose_full (gdisp);
gdisplays_flush ();
}
/* 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,
int dir)
{
unsigned char scalesrc, scaledest;
double offset_x, offset_y;
long sx, sy;
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 (dir)
{
case ZOOMIN :
if (scalesrc > 1)
scalesrc--;
else
if (scaledest < 0x10)
scaledest++;
break;
case ZOOMOUT :
if (scaledest > 1)
scaledest--;
else
if (scalesrc < 0x10)
scalesrc++;
break;
default :
scalesrc = dir/100;
if (scalesrc < 1)
scalesrc = 1;
else if (scalesrc > 0x10)
scalesrc = 0x10;
scaledest = dir%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);
}
}
void
setup_scale (GDisplay *gdisp)
{
GtkRuler *hruler;
GtkRuler *vruler;
gfloat sx, sy;
gfloat step;
sx = SCALE(gdisp, gdisp->gimage->width);
sy = SCALE(gdisp, gdisp->gimage->height);
step = SCALE(gdisp, 1);
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 = step;
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 = step;
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 = UNSCALE (gdisp, gdisp->disp_width);
hruler->max_size = MAXIMUM (gdisp->gimage->width, gdisp->gimage->height);
vruler->lower = 0;
vruler->upper = UNSCALE (gdisp, gdisp->disp_height);
vruler->max_size = MAXIMUM (gdisp->gimage->width, gdisp->gimage->height);
if (sx < gdisp->disp_width)
{
gdisp->disp_xoffset = (gdisp->disp_width - sx) / 2;
hruler->lower -= UNSCALE (gdisp, (double) gdisp->disp_xoffset);
hruler->upper -= UNSCALE (gdisp, (double) gdisp->disp_xoffset);
}
else
{
gdisp->disp_xoffset = 0;
hruler->lower += UNSCALE (gdisp, (double) gdisp->offset_x);
hruler->upper += UNSCALE (gdisp, (double) gdisp->offset_x);
}
if (sy < gdisp->disp_height)
{
gdisp->disp_yoffset = (gdisp->disp_height - sy) / 2;
vruler->lower -= UNSCALE (gdisp, (double) gdisp->disp_yoffset);
vruler->upper -= UNSCALE (gdisp, (double) gdisp->disp_yoffset);
}
else
{
gdisp->disp_yoffset = 0;
vruler->lower += UNSCALE (gdisp, (double) gdisp->offset_y);
vruler->upper += UNSCALE (gdisp, (double) gdisp->offset_y);
}
gtk_widget_draw (GTK_WIDGET (hruler), NULL);
gtk_widget_draw (GTK_WIDGET (vruler), NULL);
}