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/*===========================================================================*
* fsize.c *
* *
* procedures to keep track of frame size *
* *
* EXPORTED PROCEDURES: *
* Fsize_Reset *
* Fsize_Note *
* Fsize_Validate *
* *
* EXPORTED VARIABLES: *
* Fsize_x *
* Fsize_y *
* *
*===========================================================================*/
/*
* Copyright (c) 1995 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
/*==============*
* HEADER FILES *
*==============*/
#include "all.h"
#include "fsize.h"
#include "dct.h"
/*==================*
* GLOBAL VARIABLES *
*==================*/
int Fsize_x = 0;
int Fsize_y = 0;
/*=====================*
* EXPORTED PROCEDURES *
*=====================*/
/*===========================================================================*
*
* Fsize_Reset
*
* reset the frame size to 0
*
* RETURNS: nothing
*
* SIDE EFFECTS: Fsize_x, Fsize_y
*
*===========================================================================*/
void
Fsize_Reset(void) {
Fsize_x = Fsize_y = 0;
}
/*===========================================================================*
*
* Fsize_Validate
*
* make sure that the x, y values are 16-pixel aligned
*
* RETURNS: modifies the x, y values to 16-pixel alignment
*
* SIDE EFFECTS: none
*
*===========================================================================*/
void
Fsize_Validate(int * const xP,
int * const yP) {
*xP &= ~(DCTSIZE * 2 - 1); /* Zero the low-order bits */
*yP &= ~(DCTSIZE * 2 - 1); /* Zero the low-order bits */
}
/*===========================================================================*
*
* Fsize_Note
*
* note the given frame size and modify the global values as appropriate
*
* RETURNS: nothing
*
* SIDE EFFECTS: Fsize_x, Fsize_y
*
*===========================================================================*/
void
Fsize_Note(int const id,
unsigned int const width,
unsigned int const height) {
Fsize_x = width;
Fsize_y = height;
Fsize_Validate(&Fsize_x, &Fsize_y);
if ((Fsize_x == 0) || (Fsize_y == 0)) {
fprintf(stderr,"Frame %d: size is less than the minimum: %d x %d!\n",
id, DCTSIZE*2, DCTSIZE*2);
exit(1);
}
#ifdef BLEAH
if (Fsize_x == 0) {
Fsize_x = width;
Fsize_y = height;
Fsize_Validate(&Fsize_x, &Fsize_y);
} else if (width < Fsize_x || height < Fsize_y) {
fprintf(stderr, "Frame %d: wrong size: (%d,%d). Should be greater or equal to: (%d,%d)\n",
id, width, height, Fsize_x, Fsize_y);
exit(1);
}
#endif
}
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