/* $XConsortium: jutils.c,v 1.4 94/04/17 20:35:46 rws Exp $ */ /* Module jutils.c */ /**************************************************************************** Copyright (c) 1993, 1994 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. NOTICE This software is being provided by AGE Logic, Inc. under the following license. By obtaining, using and/or copying this software, you agree that you have read, understood, and will comply with these terms and conditions: Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose and without fee or royalty and to grant others any or all rights granted herein is hereby granted, provided that you agree to comply with the following copyright notice and statements, including the disclaimer, and that the same appears on all copies and derivative works of the software and documentation you make. "Copyright 1993, 1994 by AGE Logic, Inc." THIS SOFTWARE IS PROVIDED "AS IS". AGE LOGIC MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. By way of example, but not limitation, AGE LOGIC MAKE NO REPRESENTATIONS OR WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE SOFTWARE DOES NOT INFRINGE THIRD-PARTY PROPRIETARY RIGHTS. AGE LOGIC SHALL BEAR NO LIABILITY FOR ANY USE OF THIS SOFTWARE. IN NO EVENT SHALL EITHER PARTY BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOSS OF PROFITS, REVENUE, DATA OR USE, INCURRED BY EITHER PARTY OR ANY THIRD PARTY, WHETHER IN AN ACTION IN CONTRACT OR TORT OR BASED ON A WARRANTY, EVEN IF AGE LOGIC LICENSEES HEREUNDER HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. The name of AGE Logic, Inc. may not be used in advertising or publicity pertaining to this software without specific, written prior permission from AGE Logic. Title to this software shall at all times remain with AGE Logic, Inc. ***************************************************************************** Gary Rogers, AGE Logic, Inc., October 1993 Gary Rogers, AGE Logic, Inc., January 1994 ****************************************************************************/ /* * jutils.c * * Copyright (C) 1991, 1992, Thomas G. Lane. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * * This file contains miscellaneous utility routines needed for both * compression and decompression. * Note we prefix all global names with "j" to minimize conflicts with * a surrounding application. */ #include "jinclude.h" GLOBAL long #ifdef XIE_SUPPORTED #if NeedFunctionPrototypes jround_up (long a, long b) #else jround_up (a, b) long a; long b; #endif /* NeedFunctionPrototypes */ #else jround_up (long a, long b) #endif /* XIE_SUPPORTED */ /* Compute a rounded up to next multiple of b; a >= 0, b > 0 */ { a += b-1; return a - (a % b); } /* On normal machines we can apply MEMCOPY() and MEMZERO() to sample arrays * and coefficient-block arrays. This won't work on 80x86 because the arrays * are FAR and we're assuming a small-pointer memory model. However, some * DOS compilers provide far-pointer versions of memcpy() and memset() even * in the small-model libraries. These will be used if USE_FMEM is defined. * Otherwise, the routines below do it the hard way. (The performance cost * is not all that great, because these routines aren't very heavily used.) */ #ifndef NEED_FAR_POINTERS /* normal case, same as regular macros */ #define FMEMCOPY(dest,src,size) MEMCOPY(dest,src,size) #define FMEMZERO(target,size) MEMZERO(target,size) #else /* 80x86 case, define if we can */ #ifdef USE_FMEM #define FMEMCOPY(dest,src,size) _fmemcpy((pointer)(dest), (const pointer)(src), (size_t)(size)) #define FMEMZERO(target,size) _fmemset((pointer)(target), 0, (size_t)(size)) #endif #endif GLOBAL void #ifdef XIE_SUPPORTED #if NeedFunctionPrototypes jcopy_sample_rows (JSAMPARRAY input_array, int source_row, JSAMPARRAY output_array, int dest_row, int num_rows, long num_cols) #else jcopy_sample_rows (input_array, source_row, output_array, dest_row, num_rows, num_cols) JSAMPARRAY input_array; int source_row; JSAMPARRAY output_array; int dest_row; int num_rows; long num_cols; #endif /* NeedFunctionPrototypes */ #else jcopy_sample_rows (JSAMPARRAY input_array, int source_row, JSAMPARRAY output_array, int dest_row, int num_rows, long num_cols) #endif /* XIE_SUPPORTED */ /* Copy some rows of samples from one place to another. * num_rows rows are copied from input_array[source_row++] * to output_array[dest_row++]; these areas should not overlap. * The source and destination arrays must be at least as wide as num_cols. */ { register JSAMPROW inptr, outptr; #ifdef FMEMCOPY register size_t count = (size_t) (num_cols * SIZEOF(JSAMPLE)); #else register long count; #endif register int row; input_array += source_row; output_array += dest_row; for (row = num_rows; row > 0; row--) { inptr = *input_array++; outptr = *output_array++; #ifdef FMEMCOPY FMEMCOPY(outptr, inptr, count); #else for (count = num_cols; count > 0; count--) *outptr++ = *inptr++; /* needn't bother with GETJSAMPLE() here */ #endif } } #ifndef XIE_SUPPORTED GLOBAL void #ifdef XIE_SUPPORTED #if NeedFunctionPrototypes jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row, long num_blocks) #else jcopy_block_row (input_row, output_row, num_blocks) JBLOCKROW input_row; JBLOCKROW output_row; long num_blocks; #endif /* NeedFunctionPrototypes */ #else jcopy_block_row (JBLOCKROW input_row, JBLOCKROW output_row, long num_blocks) #endif /* XIE_SUPPORTED */ /* Copy a row of coefficient blocks from one place to another. */ { #ifdef FMEMCOPY FMEMCOPY(output_row, input_row, num_blocks * (DCTSIZE2 * SIZEOF(JCOEF))); #else register JCOEFPTR inptr, outptr; register long count; inptr = (JCOEFPTR) input_row; outptr = (JCOEFPTR) output_row; for (count = num_blocks * DCTSIZE2; count > 0; count--) { *outptr++ = *inptr++; } #endif } #endif /* XIE_SUPPORTED */ GLOBAL void #ifdef XIE_SUPPORTED #if NeedFunctionPrototypes jzero_far (pointer target, size_t bytestozero) #else jzero_far (target, bytestozero) pointer target; size_t bytestozero; #endif /* NeedFunctionPrototypes */ #else jzero_far (pointer target, size_t bytestozero) #endif /* XIE_SUPPORTED */ /* Zero out a chunk of FAR memory. */ /* This might be sample-array data, block-array data, or alloc_medium data. */ { #ifdef FMEMZERO FMEMZERO(target, bytestozero); #else register char FAR * ptr = (char FAR *) target; register size_t count; for (count = bytestozero; count > 0; count--) { *ptr++ = 0; } #endif }