00001 /*===========================================================================*
00002  * fsize.c                                                                   *
00003  *                                                                           *
00004  *      procedures to keep track of frame size                               *
00005  *                                                                           *
00006  * EXPORTED PROCEDURES:                                                      *
00007  *      Fsize_Reset                                                          *
00008  *      Fsize_Note                                                           *
00009  *      Fsize_Validate                                                       *
00010  *                                                                           *
00011  * EXPORTED VARIABLES:                                                       *
00012  *      Fsize_x                                                              *
00013  *      Fsize_y                                                              *
00014  *                                                                           *
00015  *===========================================================================*/
00016 
00017 /*
00018  * Copyright (c) 1995 The Regents of the University of California.
00019  * All rights reserved.
00020  *
00021  * Permission to use, copy, modify, and distribute this software and its
00022  * documentation for any purpose, without fee, and without written agreement is
00023  * hereby granted, provided that the above copyright notice and the following
00024  * two paragraphs appear in all copies of this software.
00025  *
00026  * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
00027  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
00028  * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
00029  * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00030  *
00031  * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
00032  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
00033  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
00034  * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
00035  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
00036  */
00037 
00038 
00039 /*==============*
00040  * HEADER FILES *
00041  *==============*/
00042 
00043 #include "all.h"
00044 #include "fsize.h"
00045 #include "dct.h"
00046 
00047 
00048 /*==================*
00049  * GLOBAL VARIABLES *
00050  *==================*/
00051 int Fsize_x = 0;
00052 int Fsize_y = 0;
00053 
00054 
00055 /*=====================*
00056  * EXPORTED PROCEDURES *
00057  *=====================*/
00058 
00059 /*===========================================================================*
00060  *
00061  * Fsize_Reset
00062  *
00063  *      reset the frame size to 0
00064  *
00065  * RETURNS:     nothing
00066  *
00067  * SIDE EFFECTS:    Fsize_x, Fsize_y
00068  *
00069  *===========================================================================*/
00070 void
00071 Fsize_Reset()
00072 {
00073     Fsize_x = Fsize_y = 0;
00074 }
00075 
00076 
00077 /*===========================================================================*
00078  *
00079  * Fsize_Validate
00080  *
00081  *      make sure that the x, y values are 16-pixel aligned
00082  *
00083  * RETURNS:     modifies the x, y values to 16-pixel alignment
00084  *
00085  * SIDE EFFECTS:    none
00086  *
00087  *===========================================================================*/
00088 void
00089 Fsize_Validate(x, y)
00090     int *x;
00091     int *y;
00092 {
00093     *x &= ~(DCTSIZE * 2 - 1);
00094     *y &= ~(DCTSIZE * 2 - 1);
00095 }
00096 
00097 
00098 /*===========================================================================*
00099  *
00100  * Fsize_Note
00101  *
00102  *      note the given frame size and modify the global values as appropriate
00103  *
00104  * RETURNS:     nothing
00105  *
00106  * SIDE EFFECTS:    Fsize_x, Fsize_y
00107  *
00108  *===========================================================================*/
00109 void
00110 Fsize_Note(id, width, height)
00111     int id;
00112     int width;
00113     int height;
00114 {
00115     Fsize_x = width;
00116     Fsize_y = height;
00117     Fsize_Validate(&Fsize_x, &Fsize_y);
00118 
00119     if ((Fsize_x==0) || (Fsize_y==0)) {
00120       fprintf(stderr,"Frame %d:  size is zero!\n",id);
00121 /*      exit(1); */
00122     }
00123 
00124 #ifdef BLEAH
00125     if (Fsize_x == 0) {
00126         Fsize_x = width;
00127         Fsize_y = height;
00128         Fsize_Validate(&Fsize_x, &Fsize_y);
00129     } else if (width < Fsize_x || height < Fsize_y) {
00130         fprintf(stderr, "Frame %d: wrong size: (%d,%d).  Should be greater or equal to: (%d,%d)\n",
00131                 id, width, height, Fsize_x, Fsize_y);
00132         exit(1);
00133     }
00134 #endif
00135 }