/* $XConsortium: jcdeflts.c,v 1.4 94/04/17 20:35:27 rws Exp $ */ /* Module jcdeflts.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 ****************************************************************************/ /* * jcdeflts.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 optional default-setting code for the JPEG compressor. * User interfaces do not have to use this file, but those that don't use it * must know a lot more about the innards of the JPEG code. */ #include "jinclude.h" #ifndef XIE_SUPPORTED /* Default do-nothing progress monitoring routine. * This can be overridden by a user interface that wishes to * provide progress monitoring; just set methods->progress_monitor * after j_c_defaults is done. The routine will be called periodically * during the compression process. * * During any one pass, loopcounter increases from 0 up to (not including) * looplimit; the step size is not necessarily 1. Both the step size and * the limit may differ between passes. The expected total number of passes * is in cinfo->total_passes, and the number of passes already completed is * in cinfo->completed_passes. Thus the fraction of work completed may be * estimated as * completed_passes + (loopcounter/looplimit) * ------------------------------------------ * total_passes * ignoring the fact that the passes may not be equal amounts of work. */ METHODDEF void progress_monitor (compress_info_ptr cinfo, long loopcounter, long looplimit) { /* do nothing */ } #endif /* XIE_SUPPORTED */ /* * Huffman table setup routines */ #ifdef XIE_SUPPORTED GLOBAL int #if NeedFunctionPrototypes add_huff_table (compress_info_ptr cinfo, HUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val) #else add_huff_table (cinfo, htblptr, bits, val) compress_info_ptr cinfo; HUFF_TBL **htblptr; const UINT8 *bits; const UINT8 *val; #endif /* NeedFunctionPrototypes */ #else LOCAL void add_huff_table (compress_info_ptr cinfo, HUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val) #endif /* XIE_SUPPORTED */ /* Define a Huffman table */ { #ifdef XIE_SUPPORTED if (*htblptr == NULL) *htblptr = (HUFF_TBL *) (*cinfo->emethods->c_alloc_small) (cinfo, SIZEOF(HUFF_TBL)); if (*htblptr == NULL) return(XIE_ERR); #else if (*htblptr == NULL) *htblptr = (HUFF_TBL *) (*cinfo->emethods->alloc_small) (SIZEOF(HUFF_TBL)); #endif /* XIE_SUPPORTED */ MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); MEMCOPY((*htblptr)->huffval, val, SIZEOF((*htblptr)->huffval)); /* Initialize sent_table FALSE so table will be written to JPEG file. * In an application where we are writing non-interchange JPEG files, * it might be desirable to save space by leaving default Huffman tables * out of the file. To do that, just initialize sent_table = TRUE... */ (*htblptr)->sent_table = FALSE; #ifdef XIE_SUPPORTED return(0); #endif /* XIE_SUPPORTED */ } #ifdef XIE_SUPPORTED LOCAL int #if NeedFunctionPrototypes std_huff_tables (compress_info_ptr cinfo) #else std_huff_tables (cinfo) compress_info_ptr cinfo; #endif /* NeedFunctionPrototypes */ #else LOCAL void std_huff_tables (compress_info_ptr cinfo) #endif /* XIE_SUPPORTED */ /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ /* IMPORTANT: these are only valid for 8-bit data precision! */ { static const UINT8 dc_luminance_bits[17] = { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; static const UINT8 dc_luminance_val[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; static const UINT8 dc_chrominance_bits[17] = { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; static const UINT8 dc_chrominance_val[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; static const UINT8 ac_luminance_bits[17] = { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; static const UINT8 ac_luminance_val[] = { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa }; static const UINT8 ac_chrominance_bits[17] = { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; static const UINT8 ac_chrominance_val[] = { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa }; #ifdef XIE_SUPPORTED if(XIE_ERR == add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0], dc_luminance_bits, dc_luminance_val)) return(XIE_ERR); if(XIE_ERR == add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0], ac_luminance_bits, ac_luminance_val)) return(XIE_ERR); if(XIE_ERR == add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1], dc_chrominance_bits, dc_chrominance_val)) return(XIE_ERR); if(XIE_ERR == add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1], ac_chrominance_bits, ac_chrominance_val)) return(XIE_ERR); return(0); #else add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0], dc_luminance_bits, dc_luminance_val); add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0], ac_luminance_bits, ac_luminance_val); add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1], dc_chrominance_bits, dc_chrominance_val); add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1], ac_chrominance_bits, ac_chrominance_val); #endif /* XIE_SUPPORTED */ } /* * Quantization table setup routines */ #ifdef XIE_SUPPORTED GLOBAL int #if NeedFunctionPrototypes j_add_quant_table (compress_info_ptr cinfo, int which_tbl, const QUANT_VAL *basic_table, int scale_factor, boolean force_baseline) #else j_add_quant_table (cinfo, which_tbl, basic_table, scale_factor, force_baseline) compress_info_ptr cinfo; int which_tbl; const QUANT_VAL *basic_table; int scale_factor; boolean force_baseline; #endif /* NeedFunctionPrototypes */ #else GLOBAL void j_add_quant_table (compress_info_ptr cinfo, int which_tbl, const QUANT_VAL *basic_table, int scale_factor, boolean force_baseline) #endif /* XIE_SUPPORTED */ /* Define a quantization table equal to the basic_table times * a scale factor (given as a percentage). * If force_baseline is TRUE, the computed quantization table entries * are limited to 1..255 for JPEG baseline compatibility. */ { QUANT_TBL_PTR * qtblptr = & cinfo->quant_tbl_ptrs[which_tbl]; int i; long temp; #ifdef XIE_SUPPORTED if (*qtblptr == NULL) *qtblptr = (QUANT_TBL_PTR) (*cinfo->emethods->c_alloc_small) (cinfo, SIZEOF(QUANT_TBL)); if (*qtblptr == NULL) return(XIE_ERR); #else if (*qtblptr == NULL) *qtblptr = (QUANT_TBL_PTR) (*cinfo->emethods->alloc_small) (SIZEOF(QUANT_TBL)); #endif /* XIE_SUPPORTED */ for (i = 0; i < DCTSIZE2; i++) { temp = ((long) basic_table[i] * scale_factor + 50L) / 100L; /* limit the values to the valid range */ if (temp <= 0L) temp = 1L; #ifdef EIGHT_BIT_SAMPLES if (temp > 32767L) temp = 32767L; /* QUANT_VALs are 'short' */ #else if (temp > 65535L) temp = 65535L; /* QUANT_VALs are 'UINT16' */ #endif if (force_baseline && temp > 255L) temp = 255L; /* limit to baseline range if requested */ (*qtblptr)[i] = (QUANT_VAL) temp; } #ifdef XIE_SUPPORTED return(0); #endif /* XIE_SUPPORTED */ } GLOBAL int #ifdef XIE_SUPPORTED #if NeedFunctionPrototypes j_quality_scaling (int quality) #else j_quality_scaling (quality) int quality; #endif /* NeedFunctionPrototypes */ #else j_quality_scaling (int quality) #endif /* XIE_SUPPORTED */ /* Convert a user-specified quality rating to a percentage scaling factor * for an underlying quantization table, using our recommended scaling curve. * The input 'quality' factor should be 0 (terrible) to 100 (very good). */ { /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */ if (quality <= 0) quality = 1; if (quality > 100) quality = 100; /* The basic table is used as-is (scaling 100) for a quality of 50. * Qualities 50..100 are converted to scaling percentage 200 - 2*Q; * note that at Q=100 the scaling is 0, which will cause j_add_quant_table * to make all the table entries 1 (hence, no quantization loss). * Qualities 1..50 are converted to scaling percentage 5000/Q. */ if (quality < 50) quality = 5000 / quality; else quality = 200 - quality*2; return quality; } #ifdef XIE_SUPPORTED GLOBAL int #if NeedFunctionPrototypes j_set_quality (compress_info_ptr cinfo, int quality, boolean force_baseline) #else j_set_quality (cinfo, quality, force_baseline) compress_info_ptr cinfo; int quality; boolean force_baseline; #endif /* NeedFunctionPrototypes */ #else GLOBAL void j_set_quality (compress_info_ptr cinfo, int quality, boolean force_baseline) #endif /* XIE_SUPPORTED */ /* Set or change the 'quality' (quantization) setting, using default tables. * This is the standard quality-adjusting entry point for typical user * interfaces; only those who want detailed control over quantization tables * would use the preceding two routines directly. */ { /* This is the sample quantization table given in the JPEG spec section K.1, * but expressed in zigzag order (as are all of our quant. tables). * The spec says that the values given produce "good" quality, and * when divided by 2, "very good" quality. (These two settings are * selected by quality=50 and quality=75 respectively.) */ static const QUANT_VAL std_luminance_quant_tbl[DCTSIZE2] = { 16, 11, 12, 14, 12, 10, 16, 14, 13, 14, 18, 17, 16, 19, 24, 40, 26, 24, 22, 22, 24, 49, 35, 37, 29, 40, 58, 51, 61, 60, 57, 51, 56, 55, 64, 72, 92, 78, 64, 68, 87, 69, 55, 56, 80, 109, 81, 87, 95, 98, 103, 104, 103, 62, 77, 113, 121, 112, 100, 120, 92, 101, 103, 99 }; static const QUANT_VAL std_chrominance_quant_tbl[DCTSIZE2] = { 17, 18, 18, 24, 21, 24, 47, 26, 26, 47, 99, 66, 56, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99 }; /* Convert user 0-100 rating to percentage scaling */ quality = j_quality_scaling(quality); /* Set up two quantization tables using the specified quality scaling */ #ifdef XIE_SUPPORTED if (j_add_quant_table(cinfo, 0, std_luminance_quant_tbl, quality, force_baseline) == XIE_ERR) return(XIE_ERR); if(j_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, quality, force_baseline) == XIE_ERR) return(XIE_ERR); return(0); #else j_add_quant_table(cinfo, 0, std_luminance_quant_tbl, quality, force_baseline); j_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, quality, force_baseline); #endif /* XIE_SUPPORTED */ } /* Default parameter setup for compression. * * User interfaces that don't choose to use this routine must do their * own setup of all these parameters. Alternately, you can call this * to establish defaults and then alter parameters selectively. This * is the recommended approach since, if we add any new parameters, * your code will still work (they'll be set to reasonable defaults). * * See above for the meaning of the 'quality' and 'force_baseline' parameters. * Typically, the application's default quality setting will be passed to this * routine. A later call on j_set_quality() can be used to change to a * user-specified quality setting. * * This routine sets up for a color image; to output a grayscale image, * do this first and call j_monochrome_default() afterwards. * (The latter can be called within c_ui_method_selection, so the * choice can depend on the input file header.) * Note that if you want a JPEG colorspace other than GRAYSCALE or YCbCr, * you should also change the component ID codes, and you should NOT emit * a JFIF header (set write_JFIF_header = FALSE). * * CAUTION: if you want to compress multiple images per run, it's necessary * to call j_c_defaults before *each* call to jpeg_compress, since subsidiary * structures like the Huffman tables are automatically freed during cleanup. */ #ifdef XIE_SUPPORTED GLOBAL int #if NeedFunctionPrototypes j_c_defaults (compress_info_ptr cinfo, int quality, boolean force_baseline) #else j_c_defaults (cinfo, quality, force_baseline) compress_info_ptr cinfo; int quality; boolean force_baseline; #endif /* NeedFunctionPrototypes */ #else GLOBAL void j_c_defaults (compress_info_ptr cinfo, int quality, boolean force_baseline) #endif /* XIE_SUPPORTED */ /* NB: the external methods must already be set up. */ { short i; jpeg_component_info * compptr; /* Initialize pointers as needed to mark stuff unallocated. */ cinfo->comp_info = NULL; for (i = 0; i < NUM_QUANT_TBLS; i++) cinfo->quant_tbl_ptrs[i] = NULL; for (i = 0; i < NUM_HUFF_TBLS; i++) { cinfo->dc_huff_tbl_ptrs[i] = NULL; cinfo->ac_huff_tbl_ptrs[i] = NULL; } cinfo->data_precision = BITS_IN_JSAMPLE; /* default; can be overridden by input_init */ cinfo->density_unit = 0; /* Pixel size is unknown by default */ cinfo->X_density = 1; /* Pixel aspect ratio is square by default */ cinfo->Y_density = 1; cinfo->input_gamma = 1.0; /* no gamma correction by default */ /* Prepare three color components; first is luminance which is also usable */ /* for grayscale. The others are assumed to be UV or similar chrominance. */ cinfo->write_JFIF_header = TRUE; cinfo->jpeg_color_space = CS_YCbCr; cinfo->num_components = 3; #ifdef XIE_SUPPORTED cinfo->comp_info = (jpeg_component_info *) (*cinfo->emethods->c_alloc_small) (cinfo, (4 * SIZEOF(jpeg_component_info))); if (cinfo->comp_info == NULL) return(XIE_ERR); #else cinfo->comp_info = (jpeg_component_info *) (*cinfo->emethods->alloc_small) (4 * SIZEOF(jpeg_component_info)); #endif /* XIE_SUPPORTED */ /* Note: we allocate a 4-entry comp_info array so that user interface can * easily change over to CMYK color space if desired. */ compptr = &cinfo->comp_info[0]; compptr->component_index = 0; compptr->component_id = 1; /* JFIF specifies IDs 1,2,3 */ #ifdef XIE_SUPPORTED compptr->h_samp_factor = cinfo->xie_h_samp_factor[0]; compptr->v_samp_factor = cinfo->xie_v_samp_factor[0]; #else compptr->h_samp_factor = 2; /* default to 2x2 subsamples of chrominance */ compptr->v_samp_factor = 2; #endif /* XIE_SUPPORTED */ compptr->quant_tbl_no = 0; /* use tables 0 for luminance */ compptr->dc_tbl_no = 0; compptr->ac_tbl_no = 0; compptr = &cinfo->comp_info[1]; compptr->component_index = 1; compptr->component_id = 2; #ifdef XIE_SUPPORTED compptr->h_samp_factor = cinfo->xie_h_samp_factor[1]; compptr->v_samp_factor = cinfo->xie_v_samp_factor[1]; #else compptr->h_samp_factor = 1; compptr->v_samp_factor = 1; #endif /* XIE_SUPPORTED */ compptr->quant_tbl_no = 1; /* use tables 1 for chrominance */ compptr->dc_tbl_no = 1; compptr->ac_tbl_no = 1; compptr = &cinfo->comp_info[2]; compptr->component_index = 2; compptr->component_id = 3; #ifdef XIE_SUPPORTED compptr->h_samp_factor = cinfo->xie_h_samp_factor[2]; compptr->v_samp_factor = cinfo->xie_v_samp_factor[2]; #else compptr->h_samp_factor = 1; compptr->v_samp_factor = 1; #endif /* XIE_SUPPORTED */ compptr->quant_tbl_no = 1; /* use tables 1 for chrominance */ compptr->dc_tbl_no = 1; compptr->ac_tbl_no = 1; /* Set up two quantization tables using the specified quality scaling */ #ifdef XIE_SUPPORTED if (j_set_quality(cinfo, quality, force_baseline) == XIE_ERR) return(XIE_ERR); #else j_set_quality(cinfo, quality, force_baseline); #endif /* XIE_SUPPORTED */ /* Set up two Huffman tables in case user interface wants Huffman coding */ #ifdef XIE_SUPPORTED if(std_huff_tables(cinfo) == XIE_ERR) return(XIE_ERR); #else std_huff_tables(cinfo); #endif /* XIE_SUPPORTED */ /* Initialize default arithmetic coding conditioning */ for (i = 0; i < NUM_ARITH_TBLS; i++) { cinfo->arith_dc_L[i] = 0; cinfo->arith_dc_U[i] = 1; cinfo->arith_ac_K[i] = 5; } /* Use Huffman coding, not arithmetic coding, by default */ cinfo->arith_code = FALSE; /* Color images are interleaved by default */ cinfo->interleave = TRUE; /* By default, don't do extra passes to optimize entropy coding */ cinfo->optimize_coding = FALSE; /* By default, use the simpler non-cosited sampling alignment */ cinfo->CCIR601_sampling = FALSE; /* No input smoothing */ cinfo->smoothing_factor = 0; /* No restart markers */ cinfo->restart_interval = 0; cinfo->restart_in_rows = 0; #ifdef XIE_SUPPORTED return(0); #else /* Install default do-nothing progress monitoring method. */ cinfo->methods->progress_monitor = progress_monitor; #endif /* XIE_SUPPORTED */ } GLOBAL void #ifdef XIE_SUPPORTED #if NeedFunctionPrototypes j_monochrome_default (compress_info_ptr cinfo) #else j_monochrome_default (cinfo) compress_info_ptr cinfo; #endif /* NeedFunctionPrototypes */ #else j_monochrome_default (compress_info_ptr cinfo) #endif /* XIE_SUPPORTED */ /* Change the j_c_defaults() values to emit a monochrome JPEG file. */ { jpeg_component_info * compptr; cinfo->jpeg_color_space = CS_GRAYSCALE; cinfo->num_components = 1; /* Set single component to 1x1 subsampling */ compptr = &cinfo->comp_info[0]; compptr->h_samp_factor = 1; compptr->v_samp_factor = 1; }