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gimp/app/perspective_tool.c

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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 "appenv.h"
#include "drawable.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "info_dialog.h"
#include "perspective_tool.h"
#include "selection.h"
#include "tools.h"
#include "transform_core.h"
#include "transform_tool.h"
#include "undo.h"
#include "libgimp/gimpintl.h"
#include "tile_manager_pvt.h"
/* storage for information dialog fields */
static char matrix_row_buf [3][MAX_INFO_BUF];
/* forward function declarations */
static void * perspective_tool_recalc (Tool *, void *);
static void perspective_tool_motion (Tool *, void *);
static void perspective_info_update (Tool *);
void *
perspective_tool_transform (Tool *tool,
gpointer gdisp_ptr,
int state)
{
GDisplay * gdisp;
TransformCore * transform_core;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
switch (state)
{
case INIT :
if (!transform_info)
{
transform_info =
info_dialog_new (_("Perspective Transform Information"),
tools_help_func, NULL);
info_dialog_add_label (transform_info, "Matrix:",
matrix_row_buf[0]);
info_dialog_add_label (transform_info, "", matrix_row_buf[1]);
info_dialog_add_label (transform_info, "", matrix_row_buf[2]);
}
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
transform_core->trans_info [X0] = (double) transform_core->x1;
transform_core->trans_info [Y0] = (double) transform_core->y1;
transform_core->trans_info [X1] = (double) transform_core->x2;
transform_core->trans_info [Y1] = (double) transform_core->y1;
transform_core->trans_info [X2] = (double) transform_core->x1;
transform_core->trans_info [Y2] = (double) transform_core->y2;
transform_core->trans_info [X3] = (double) transform_core->x2;
transform_core->trans_info [Y3] = (double) transform_core->y2;
return NULL;
break;
case MOTION :
perspective_tool_motion (tool, gdisp_ptr);
return (perspective_tool_recalc (tool, gdisp_ptr));
break;
case RECALC :
return (perspective_tool_recalc (tool, gdisp_ptr));
break;
case FINISH :
/* Let the transform core handle the inverse mapping */
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
return
perspective_tool_perspective (gdisp->gimage,
gimage_active_drawable (gdisp->gimage),
gdisp,
transform_core->original,
transform_tool_smoothing (),
transform_core->transform);
break;
}
return NULL;
}
Tool *
tools_new_perspective_tool ()
{
Tool * tool;
TransformCore * private;
tool = transform_core_new (PERSPECTIVE, INTERACTIVE);
private = tool->private;
/* set the rotation specific transformation attributes */
private->trans_func = perspective_tool_transform;
private->trans_info[X0] = 0;
private->trans_info[Y0] = 0;
private->trans_info[X1] = 0;
private->trans_info[Y1] = 0;
private->trans_info[X2] = 0;
private->trans_info[Y2] = 0;
private->trans_info[X3] = 0;
private->trans_info[Y3] = 0;
/* assemble the transformation matrix */
gimp_matrix_identity (private->transform);
return tool;
}
void
tools_free_perspective_tool (Tool *tool)
{
transform_core_free (tool);
}
static void
perspective_info_update (Tool *tool)
{
TransformCore * transform_core;
int i;
transform_core = (TransformCore *) tool->private;
for (i = 0; i < 3; i++)
{
char *p = matrix_row_buf[i];
int j;
for (j = 0; j < 3; j++)
{
p += g_snprintf (p, MAX_INFO_BUF - (p - matrix_row_buf[i]),
"%10.3g", transform_core->transform[i][j]);
}
}
info_dialog_update (transform_info);
info_dialog_popup (transform_info);
return;
}
static void
perspective_tool_motion (Tool *tool,
void *gdisp_ptr)
{
GDisplay * gdisp;
TransformCore * transform_core;
int diff_x, diff_y;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
diff_x = transform_core->curx - transform_core->lastx;
diff_y = transform_core->cury - transform_core->lasty;
switch (transform_core->function)
{
case HANDLE_1 :
transform_core->trans_info [X0] += diff_x;
transform_core->trans_info [Y0] += diff_y;
break;
case HANDLE_2 :
transform_core->trans_info [X1] += diff_x;
transform_core->trans_info [Y1] += diff_y;
break;
case HANDLE_3 :
transform_core->trans_info [X2] += diff_x;
transform_core->trans_info [Y2] += diff_y;
break;
case HANDLE_4 :
transform_core->trans_info [X3] += diff_x;
transform_core->trans_info [Y3] += diff_y;
break;
default :
return;
}
}
static void *
perspective_tool_recalc (Tool *tool,
void *gdisp_ptr)
{
TransformCore * transform_core;
GDisplay * gdisp;
GimpMatrix m;
double cx, cy;
double scalex, scaley;
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
/* determine the perspective transform that maps from
* the unit cube to the trans_info coordinates
*/
perspective_find_transform (transform_core->trans_info, m);
cx = transform_core->x1;
cy = transform_core->y1;
scalex = 1.0;
scaley = 1.0;
if (transform_core->x2 - transform_core->x1)
scalex = 1.0 / (transform_core->x2 - transform_core->x1);
if (transform_core->y2 - transform_core->y1)
scaley = 1.0 / (transform_core->y2 - transform_core->y1);
/* assemble the transformation matrix */
gimp_matrix_identity (transform_core->transform);
gimp_matrix_translate (transform_core->transform, -cx, -cy);
gimp_matrix_scale (transform_core->transform, scalex, scaley);
gimp_matrix_mult (m, transform_core->transform);
/* transform the bounding box */
transform_bounding_box (tool);
/* update the information dialog */
perspective_info_update (tool);
return (void *) 1;
}
void
perspective_find_transform (double *coords,
GimpMatrix m)
{
double dx1, dx2, dx3, dy1, dy2, dy3;
double det1, det2;
dx1 = coords[X1] - coords[X3];
dx2 = coords[X2] - coords[X3];
dx3 = coords[X0] - coords[X1] + coords[X3] - coords[X2];
dy1 = coords[Y1] - coords[Y3];
dy2 = coords[Y2] - coords[Y3];
dy3 = coords[Y0] - coords[Y1] + coords[Y3] - coords[Y2];
/* Is the mapping affine? */
if ((dx3 == 0.0) && (dy3 == 0.0))
{
m[0][0] = coords[X1] - coords[X0];
m[0][1] = coords[X3] - coords[X1];
m[0][2] = coords[X0];
m[1][0] = coords[Y1] - coords[Y0];
m[1][1] = coords[Y3] - coords[Y1];
m[1][2] = coords[Y0];
m[2][0] = 0.0;
m[2][1] = 0.0;
}
else
{
det1 = dx3 * dy2 - dy3 * dx2;
det2 = dx1 * dy2 - dy1 * dx2;
m[2][0] = det1 / det2;
det1 = dx1 * dy3 - dy1 * dx3;
det2 = dx1 * dy2 - dy1 * dx2;
m[2][1] = det1 / det2;
m[0][0] = coords[X1] - coords[X0] + m[2][0] * coords[X1];
m[0][1] = coords[X2] - coords[X0] + m[2][1] * coords[X2];
m[0][2] = coords[X0];
m[1][0] = coords[Y1] - coords[Y0] + m[2][0] * coords[Y1];
m[1][1] = coords[Y2] - coords[Y0] + m[2][1] * coords[Y2];
m[1][2] = coords[Y0];
}
m[2][2] = 1.0;
}
void *
perspective_tool_perspective (GImage *gimage,
GimpDrawable *drawable,
GDisplay *gdisp,
TileManager *float_tiles,
int interpolation,
GimpMatrix matrix)
{
void *ret;
gimp_progress *progress;
progress = progress_start (gdisp, _("Perspective..."), FALSE, NULL, NULL);
ret = transform_core_do (gimage, drawable, float_tiles,
interpolation, matrix,
progress? progress_update_and_flush:NULL, progress);
if (progress)
progress_end (progress);
return ret;
}
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