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perspect.c    156 lines (112 with data), 3.6 kB

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/* Panorama_Tools - Generate, Edit and Convert Panoramic Images
Copyright (C) 1998,1999 - Helmut Dersch der@fh-furtwangen.de
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, 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 "filter.h"
// -------------------------- Functions ------------------------------------------------------
void perspective(TrformStr *TrPtr, pPrefs *prefs)
{
double v[3]; // auxilliary vector
double points_per_degree;
double mt[3][3];
double alpha, beta, gammar; // Angles in rad
double x_off, y_off, d;
double a;
uint32_t destwidth, destheight;
fDesc fD;
void *params[4]; // Parameters for perspective control functions
params[0] = (void*)mt;
params[1] = (void*)&d;
params[2] = (void*)&x_off;
params[3] = (void*)&y_off;
// Set destination image parameters
destwidth = prefs->width;
destheight = prefs->height;
if( destwidth <= 0 || destheight <= 0 )
{
TrPtr->success = 0;
PrintError( "Zero Destination Image Size" );
return;
}
if( SetDestImage(TrPtr, destwidth, destheight) != 0 )
{
TrPtr->success = 0;
PrintError( "Not enough Memory.");
return;
}
// Set parameters for perspective transformation
a = DEG_TO_RAD( prefs->hfov );
alpha = DEG_TO_RAD( prefs->y_beta );
beta = DEG_TO_RAD( prefs->x_alpha );
gammar = DEG_TO_RAD( prefs->gamma );
fD.func =(trfn)NULL;
switch(prefs->format)
{
case _rectilinear:
if( a >= PI )
{
TrPtr->success = 0;
PrintError("HFOV must be smaller than 180 degrees");
return;
}
d = TrPtr->src->width / ( 2.0 * tan( a/2.0 ) );
if( prefs->unit_is_cart )
{
alpha = atan( (prefs->y_beta - TrPtr->src->height/2.0 ) / d );
beta = - atan( (prefs->x_alpha - TrPtr->src->width/2.0 ) / d );
}
fD.func = persp_rect;
break;
case _spherical_tp:
d = TrPtr->src->width / a;
if( prefs->unit_is_cart )
{
points_per_degree = ((double) TrPtr->src->width) / (a * 360 / (2 * PI)) ;
alpha = ((TrPtr->src->height/2.0 - prefs->y_beta)/ points_per_degree) * 2 * PI / 360;
beta = -((TrPtr->src->width/2.0 - prefs->x_alpha)/ points_per_degree) * 2 * PI / 360;
}
fD.func = persp_sphere;
break;
}
SetMatrix( alpha, beta, gammar , mt, 1 );
// Offset
v[0] = 0.0;
v[1] = 0.0;
v[2] = d;
matrix_mult( mt, v );
x_off = v[0]*d/v[2];
y_off = v[1]*d/v[2];
// Do transformation
if( fD.func != NULL)
{
fD.param = params;
//transFormEx( TrPtr, &fD, &fD, 0, 1 );
transForm( TrPtr, &fD, 0 );
}
else
TrPtr->success = 0;
if( TrPtr->success == 0 && ! (TrPtr->mode & _destSupplied)) // Moved here
myfree( (void**)TrPtr->dest->data );
}
void SetPerspectiveDefaults( pPrefs *pP )
{
pP->magic = 40;
pP->format = _rectilinear;
pP->hfov = 60;
pP->x_alpha = 0.0;
pP->y_beta = 0.0;
pP->gamma = 0.0;
pP->unit_is_cart = FALSE;
pP->width = 500;
pP->height = 300;
}