1793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 2793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * jdmaster.c 3793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 4793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Copyright (C) 1991-1997, Thomas G. Lane. 5793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Modified 2002-2011 by Guido Vollbeding. 6793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This file is part of the Independent JPEG Group's software. 7793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * For conditions of distribution and use, see the accompanying README file. 8793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 9793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This file contains master control logic for the JPEG decompressor. 10793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * These routines are concerned with selecting the modules to be executed 11793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * and with determining the number of passes and the work to be done in each 12793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * pass. 13793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 14793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 15793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#define JPEG_INTERNALS 16793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#include "jinclude.h" 17793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#include "jpeglib.h" 18793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 19793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 20793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* Private state */ 21793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 22793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslertypedef struct { 23793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler struct jpeg_decomp_master pub; /* public fields */ 24793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 25793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int pass_number; /* # of passes completed */ 26793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 27793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */ 28793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 29793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Saved references to initialized quantizer modules, 30793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * in case we need to switch modes. 31793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 32793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler struct jpeg_color_quantizer * quantizer_1pass; 33793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler struct jpeg_color_quantizer * quantizer_2pass; 34793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} my_decomp_master; 35793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 36793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslertypedef my_decomp_master * my_master_ptr; 37793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 38793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 39793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 40793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Determine whether merged upsample/color conversion should be used. 41793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * CRUCIAL: this must match the actual capabilities of jdmerge.c! 42793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 43793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 44793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(boolean) 45793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presleruse_merged_upsample (j_decompress_ptr cinfo) 46793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 47793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef UPSAMPLE_MERGING_SUPPORTED 48793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Merging is the equivalent of plain box-filter upsampling */ 49793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling) 50793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return FALSE; 51793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* jdmerge.c only supports YCC=>RGB color conversion */ 52793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 || 53793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_space != JCS_RGB || 54793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components != RGB_PIXELSIZE) 55793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return FALSE; 56793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* and it only handles 2h1v or 2h2v sampling ratios */ 57793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->comp_info[0].h_samp_factor != 2 || 58793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[1].h_samp_factor != 1 || 59793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[2].h_samp_factor != 1 || 60793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[0].v_samp_factor > 2 || 61793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[1].v_samp_factor != 1 || 62793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[2].v_samp_factor != 1) 63793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return FALSE; 64793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* furthermore, it doesn't work if we've scaled the IDCTs differently */ 65793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->comp_info[0].DCT_h_scaled_size != cinfo->min_DCT_h_scaled_size || 66793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[1].DCT_h_scaled_size != cinfo->min_DCT_h_scaled_size || 67793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[2].DCT_h_scaled_size != cinfo->min_DCT_h_scaled_size || 68793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[0].DCT_v_scaled_size != cinfo->min_DCT_v_scaled_size || 69793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[1].DCT_v_scaled_size != cinfo->min_DCT_v_scaled_size || 70793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->comp_info[2].DCT_v_scaled_size != cinfo->min_DCT_v_scaled_size) 71793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return FALSE; 72793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* ??? also need to test for upsample-time rescaling, when & if supported */ 73793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return TRUE; /* by golly, it'll work... */ 74793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#else 75793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return FALSE; 76793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif 77793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 78793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 79793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 80793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 81793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Compute output image dimensions and related values. 82793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * NOTE: this is exported for possible use by application. 83793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Hence it mustn't do anything that can't be done twice. 84793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Also note that it may be called before the master module is initialized! 85793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 86793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 87793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerGLOBAL(void) 88793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerjpeg_calc_output_dimensions (j_decompress_ptr cinfo) 89793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* Do computations that are needed before master selection phase. 90793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This function is used for full decompression. 91793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 92793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 93793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef IDCT_SCALING_SUPPORTED 94793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int ci; 95793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_component_info *compptr; 96793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif 97793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 98793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Prevent application from calling me at wrong times */ 99793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->global_state != DSTATE_READY) 100793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 101793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 102793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Compute core output image dimensions and DCT scaling choices. */ 103793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_core_output_dimensions(cinfo); 104793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 105793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef IDCT_SCALING_SUPPORTED 106793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 107793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* In selecting the actual DCT scaling for each component, we try to 108793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * scale up the chroma components via IDCT scaling rather than upsampling. 109793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This saves time if the upsampler gets to use 1:1 scaling. 110793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Note this code adapts subsampling ratios which are powers of 2. 111793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 112793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 113793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ci++, compptr++) { 114793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int ssize = 1; 115793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler while (cinfo->min_DCT_h_scaled_size * ssize <= 116793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) && 117793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) { 118793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ssize = ssize * 2; 119793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 120793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize; 121793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ssize = 1; 122793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler while (cinfo->min_DCT_v_scaled_size * ssize <= 123793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) && 124793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) { 125793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ssize = ssize * 2; 126793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 127793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize; 128793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 129793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* We don't support IDCT ratios larger than 2. */ 130793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2) 131793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2; 132793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2) 133793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2; 134793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 135793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 136793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Recompute downsampled dimensions of components; 137793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * application needs to know these if using raw downsampled data. 138793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 139793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 140793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ci++, compptr++) { 141793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Size in samples, after IDCT scaling */ 142793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr->downsampled_width = (JDIMENSION) 143793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jdiv_round_up((long) cinfo->image_width * 144793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size), 145793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (long) (cinfo->max_h_samp_factor * cinfo->block_size)); 146793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr->downsampled_height = (JDIMENSION) 147793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jdiv_round_up((long) cinfo->image_height * 148793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size), 149793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (long) (cinfo->max_v_samp_factor * cinfo->block_size)); 150793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 151793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 152793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif /* IDCT_SCALING_SUPPORTED */ 153793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 154793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Report number of components in selected colorspace. */ 155793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Probably this should be in the color conversion module... */ 156793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler switch (cinfo->out_color_space) { 157793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler case JCS_GRAYSCALE: 158793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components = 1; 159793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler break; 160793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler case JCS_RGB: 161793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components = RGB_PIXELSIZE; 162793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler break; 163793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler case JCS_YCbCr: 164793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components = 3; 165793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler break; 166793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler case JCS_CMYK: 167793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler case JCS_YCCK: 168793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components = 4; 169793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler break; 170793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler default: /* else must be same colorspace as in file */ 171793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components = cinfo->num_components; 172793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler break; 173793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 174793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->output_components = (cinfo->quantize_colors ? 1 : 175793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->out_color_components); 176793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 177793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* See if upsampler will want to emit more than one row at a time */ 178793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (use_merged_upsample(cinfo)) 179793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->rec_outbuf_height = cinfo->max_v_samp_factor; 180793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler else 181793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->rec_outbuf_height = 1; 182793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 183793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 184793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 185793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 186793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Several decompression processes need to range-limit values to the range 187793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 0..MAXJSAMPLE; the input value may fall somewhat outside this range 188793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * due to noise introduced by quantization, roundoff error, etc. These 189793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * processes are inner loops and need to be as fast as possible. On most 190793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * machines, particularly CPUs with pipelines or instruction prefetch, 191793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * a (subscript-check-less) C table lookup 192793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * x = sample_range_limit[x]; 193793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * is faster than explicit tests 194793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * if (x < 0) x = 0; 195793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * else if (x > MAXJSAMPLE) x = MAXJSAMPLE; 196793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * These processes all use a common table prepared by the routine below. 197793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 198793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * For most steps we can mathematically guarantee that the initial value 199793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * of x is within MAXJSAMPLE+1 of the legal range, so a table running from 200793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient. But for the initial 201793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * limiting step (just after the IDCT), a wildly out-of-range value is 202793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * possible if the input data is corrupt. To avoid any chance of indexing 203793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * off the end of memory and getting a bad-pointer trap, we perform the 204793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * post-IDCT limiting thus: 205793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * x = range_limit[x & MASK]; 206793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit 207793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * samples. Under normal circumstances this is more than enough range and 208793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * a correct output will be generated; with bogus input data the mask will 209793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * cause wraparound, and we will safely generate a bogus-but-in-range output. 210793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * For the post-IDCT step, we want to convert the data from signed to unsigned 211793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * representation by adding CENTERJSAMPLE at the same time that we limit it. 212793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * So the post-IDCT limiting table ends up looking like this: 213793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE, 214793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times), 215793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 0 (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times), 216793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 0,1,...,CENTERJSAMPLE-1 217793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Negative inputs select values from the upper half of the table after 218793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * masking. 219793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 220793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * We can save some space by overlapping the start of the post-IDCT table 221793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * with the simpler range limiting table. The post-IDCT table begins at 222793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * sample_range_limit + CENTERJSAMPLE. 223793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 224793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Note that the table is allocated in near data space on PCs; it's small 225793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * enough and used often enough to justify this. 226793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 227793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 228793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) 229793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerprepare_range_limit_table (j_decompress_ptr cinfo) 230793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* Allocate and fill in the sample_range_limit table */ 231793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 232793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JSAMPLE * table; 233793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int i; 234793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 235793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler table = (JSAMPLE *) 236793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 237793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE)); 238793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */ 239793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->sample_range_limit = table; 240793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* First segment of "simple" table: limit[x] = 0 for x < 0 */ 241793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE)); 242793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Main part of "simple" table: limit[x] = x */ 243793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (i = 0; i <= MAXJSAMPLE; i++) 244793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler table[i] = (JSAMPLE) i; 245793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */ 246793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* End of simple table, rest of first half of post-IDCT table */ 247793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++) 248793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler table[i] = MAXJSAMPLE; 249793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Second half of post-IDCT table */ 250793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MEMZERO(table + (2 * (MAXJSAMPLE+1)), 251793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE)); 252793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE), 253793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE)); 254793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 255793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 256793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 257793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 258793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Master selection of decompression modules. 259793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This is done once at jpeg_start_decompress time. We determine 260793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * which modules will be used and give them appropriate initialization calls. 261793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * We also initialize the decompressor input side to begin consuming data. 262793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 263793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Since jpeg_read_header has finished, we know what is in the SOF 264793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * and (first) SOS markers. We also have all the application parameter 265793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * settings. 266793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 267793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 268793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) 269793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslermaster_selection (j_decompress_ptr cinfo) 270793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 271793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_master_ptr master = (my_master_ptr) cinfo->master; 272793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler boolean use_c_buffer; 273793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler long samplesperrow; 274793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION jd_samplesperrow; 275793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 276793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Initialize dimensions and other stuff */ 277793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_calc_output_dimensions(cinfo); 278793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler prepare_range_limit_table(cinfo); 279793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 280793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Width of an output scanline must be representable as JDIMENSION. */ 281793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components; 282793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jd_samplesperrow = (JDIMENSION) samplesperrow; 283793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if ((long) jd_samplesperrow != samplesperrow) 284793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); 285793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 286793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Initialize my private state */ 287793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pass_number = 0; 288793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->using_merged_upsample = use_merged_upsample(cinfo); 289793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 290793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Color quantizer selection */ 291793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->quantizer_1pass = NULL; 292793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->quantizer_2pass = NULL; 293793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* No mode changes if not using buffered-image mode. */ 294793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (! cinfo->quantize_colors || ! cinfo->buffered_image) { 295793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_1pass_quant = FALSE; 296793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_external_quant = FALSE; 297793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_2pass_quant = FALSE; 298793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 299793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->quantize_colors) { 300793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->raw_data_out) 301793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_NOTIMPL); 302793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* 2-pass quantizer only works in 3-component color space. */ 303793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->out_color_components != 3) { 304793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_1pass_quant = TRUE; 305793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_external_quant = FALSE; 306793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_2pass_quant = FALSE; 307793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->colormap = NULL; 308793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else if (cinfo->colormap != NULL) { 309793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_external_quant = TRUE; 310793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else if (cinfo->two_pass_quantize) { 311793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_2pass_quant = TRUE; 312793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 313793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->enable_1pass_quant = TRUE; 314793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 315793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 316793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->enable_1pass_quant) { 317793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef QUANT_1PASS_SUPPORTED 318793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_1pass_quantizer(cinfo); 319793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->quantizer_1pass = cinfo->cquantize; 320793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#else 321793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_NOT_COMPILED); 322793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif 323793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 324793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 325793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* We use the 2-pass code to map to external colormaps. */ 326793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) { 327793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef QUANT_2PASS_SUPPORTED 328793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_2pass_quantizer(cinfo); 329793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->quantizer_2pass = cinfo->cquantize; 330793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#else 331793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_NOT_COMPILED); 332793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif 333793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 334793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* If both quantizers are initialized, the 2-pass one is left active; 335793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * this is necessary for starting with quantization to an external map. 336793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 337793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 338793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 339793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Post-processing: in particular, color conversion first */ 340793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (! cinfo->raw_data_out) { 341793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (master->using_merged_upsample) { 342793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef UPSAMPLE_MERGING_SUPPORTED 343793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_merged_upsampler(cinfo); /* does color conversion too */ 344793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#else 345793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_NOT_COMPILED); 346793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif 347793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 348793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_color_deconverter(cinfo); 349793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_upsampler(cinfo); 350793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 351793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant); 352793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 353793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Inverse DCT */ 354793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_inverse_dct(cinfo); 355793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Entropy decoding: either Huffman or arithmetic coding. */ 356793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->arith_code) 357793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_arith_decoder(cinfo); 358793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler else { 359793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_huff_decoder(cinfo); 360793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 361793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 362793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Initialize principal buffer controllers. */ 363793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image; 364793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_d_coef_controller(cinfo, use_c_buffer); 365793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 366793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (! cinfo->raw_data_out) 367793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */); 368793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 369793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* We can now tell the memory manager to allocate virtual arrays. */ 370793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 371793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 372793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Initialize input side of decompressor to consume first scan. */ 373793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->inputctl->start_input_pass) (cinfo); 374793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 375793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef D_MULTISCAN_FILES_SUPPORTED 376793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* If jpeg_start_decompress will read the whole file, initialize 377793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * progress monitoring appropriately. The input step is counted 378793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * as one pass. 379793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 380793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->progress != NULL && ! cinfo->buffered_image && 381793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->inputctl->has_multiple_scans) { 382793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int nscans; 383793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Estimate number of scans to set pass_limit. */ 384793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->progressive_mode) { 385793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */ 386793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler nscans = 2 + 3 * cinfo->num_components; 387793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 388793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* For a nonprogressive multiscan file, estimate 1 scan per component. */ 389793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler nscans = cinfo->num_components; 390793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 391793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->pass_counter = 0L; 392793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans; 393793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->completed_passes = 0; 394793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2); 395793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Count the input pass as done */ 396793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pass_number++; 397793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 398793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif /* D_MULTISCAN_FILES_SUPPORTED */ 399793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 400793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 401793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 402793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 403793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Per-pass setup. 404793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This is called at the beginning of each output pass. We determine which 405793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * modules will be active during this pass and give them appropriate 406793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * start_pass calls. We also set is_dummy_pass to indicate whether this 407793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * is a "real" output pass or a dummy pass for color quantization. 408793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * (In the latter case, jdapistd.c will crank the pass to completion.) 409793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 410793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 411793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerMETHODDEF(void) 412793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerprepare_for_output_pass (j_decompress_ptr cinfo) 413793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 414793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_master_ptr master = (my_master_ptr) cinfo->master; 415793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 416793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (master->pub.is_dummy_pass) { 417793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef QUANT_2PASS_SUPPORTED 418793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Final pass of 2-pass quantization */ 419793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pub.is_dummy_pass = FALSE; 420793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->cquantize->start_pass) (cinfo, FALSE); 421793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST); 422793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST); 423793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#else 424793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_NOT_COMPILED); 425793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif /* QUANT_2PASS_SUPPORTED */ 426793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 427793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->quantize_colors && cinfo->colormap == NULL) { 428793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Select new quantization method */ 429793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) { 430793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->cquantize = master->quantizer_2pass; 431793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pub.is_dummy_pass = TRUE; 432793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else if (cinfo->enable_1pass_quant) { 433793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->cquantize = master->quantizer_1pass; 434793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 435793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_MODE_CHANGE); 436793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 437793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 438793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->idct->start_pass) (cinfo); 439793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->coef->start_output_pass) (cinfo); 440793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (! cinfo->raw_data_out) { 441793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (! master->using_merged_upsample) 442793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->cconvert->start_pass) (cinfo); 443793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->upsample->start_pass) (cinfo); 444793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->quantize_colors) 445793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass); 446793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->post->start_pass) (cinfo, 447793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); 448793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU); 449793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 450793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 451793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 452793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Set up progress monitor's pass info if present */ 453793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->progress != NULL) { 454793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->completed_passes = master->pass_number; 455793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->total_passes = master->pass_number + 456793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (master->pub.is_dummy_pass ? 2 : 1); 457793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* In buffered-image mode, we assume one more output pass if EOI not 458793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * yet reached, but no more passes if EOI has been reached. 459793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 460793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) { 461793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1); 462793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 463793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 464793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 465793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 466793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 467793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 468793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Finish up at end of an output pass. 469793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 470793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 471793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerMETHODDEF(void) 472793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerfinish_output_pass (j_decompress_ptr cinfo) 473793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 474793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_master_ptr master = (my_master_ptr) cinfo->master; 475793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 476793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->quantize_colors) 477793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->cquantize->finish_pass) (cinfo); 478793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pass_number++; 479793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 480793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 481793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 482793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#ifdef D_MULTISCAN_FILES_SUPPORTED 483793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 484793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 485793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Switch to a new external colormap between output passes. 486793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 487793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 488793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerGLOBAL(void) 489793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerjpeg_new_colormap (j_decompress_ptr cinfo) 490793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 491793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_master_ptr master = (my_master_ptr) cinfo->master; 492793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 493793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Prevent application from calling me at wrong times */ 494793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->global_state != DSTATE_BUFIMAGE) 495793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 496793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 497793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->quantize_colors && cinfo->enable_external_quant && 498793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->colormap != NULL) { 499793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Select 2-pass quantizer for external colormap use */ 500793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->cquantize = master->quantizer_2pass; 501793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Notify quantizer of colormap change */ 502793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->cquantize->new_color_map) (cinfo); 503793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pub.is_dummy_pass = FALSE; /* just in case */ 504793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else 505793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_MODE_CHANGE); 506793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 507793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 508793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#endif /* D_MULTISCAN_FILES_SUPPORTED */ 509793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 510793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 511793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 512793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Initialize master decompression control and select active modules. 513793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This is performed at the start of jpeg_start_decompress. 514793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 515793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 516793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerGLOBAL(void) 517793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerjinit_master_decompress (j_decompress_ptr cinfo) 518793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 519793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_master_ptr master; 520793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 521793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master = (my_master_ptr) 522793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 523793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler SIZEOF(my_decomp_master)); 524793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->master = (struct jpeg_decomp_master *) master; 525793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pub.prepare_for_output_pass = prepare_for_output_pass; 526793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pub.finish_output_pass = finish_output_pass; 527793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 528793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master->pub.is_dummy_pass = FALSE; 529793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 530793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler master_selection(cinfo); 531793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 532