1e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 2e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * jccoefct.c 3e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 4e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Copyright (C) 1994-1997, Thomas G. Lane. 5e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This file is part of the Independent JPEG Group's software. 6e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * For conditions of distribution and use, see the accompanying README file. 7e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 8e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This file contains the coefficient buffer controller for compression. 9e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This controller is the top level of the JPEG compressor proper. 10e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * The coefficient buffer lies between forward-DCT and entropy encoding steps. 11e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 12e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 13e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define JPEG_INTERNALS 14e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#include "jinclude.h" 15e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#include "jpeglib.h" 16e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 17e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 18e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* We use a full-image coefficient buffer when doing Huffman optimization, 19e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * and also for writing multiple-scan JPEG files. In all cases, the DCT 20e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * step is run during the first pass, and subsequent passes need only read 21e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the buffered coefficients. 22e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 23e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef ENTROPY_OPT_SUPPORTED 24e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define FULL_COEF_BUFFER_SUPPORTED 25e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#else 26e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_MULTISCAN_FILES_SUPPORTED 27e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define FULL_COEF_BUFFER_SUPPORTED 28e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 29e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 30e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 31e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 32e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Private buffer controller object */ 33e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 34e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef struct { 35e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov struct jpeg_c_coef_controller pub; /* public fields */ 36e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 37e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION iMCU_row_num; /* iMCU row # within image */ 38e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION mcu_ctr; /* counts MCUs processed in current row */ 39e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int MCU_vert_offset; /* counts MCU rows within iMCU row */ 40e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int MCU_rows_per_iMCU_row; /* number of such rows needed */ 41e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 42e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For single-pass compression, it's sufficient to buffer just one MCU 43e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * (although this may prove a bit slow in practice). We allocate a 44e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each 45e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * MCU constructed and sent. (On 80x86, the workspace is FAR even though 46e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * it's not really very big; this is to keep the module interfaces unchanged 47e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * when a large coefficient buffer is necessary.) 48e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * In multi-pass modes, this array points to the current MCU's blocks 49e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * within the virtual arrays. 50e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 51e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; 52e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 53e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* In multi-pass modes, we need a virtual block array for each component. */ 54e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jvirt_barray_ptr whole_image[MAX_COMPONENTS]; 55e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} my_coef_controller; 56e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 57e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef my_coef_controller * my_coef_ptr; 58e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 59e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 60e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Forward declarations */ 61e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) compress_data 62e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); 63e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef FULL_COEF_BUFFER_SUPPORTED 64e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) compress_first_pass 65e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); 66e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) compress_output 67e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf)); 68e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 69e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 70e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 71e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 72e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovstart_iMCU_row (j_compress_ptr cinfo) 73e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Reset within-iMCU-row counters for a new row */ 74e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 75e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 76e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 77e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* In an interleaved scan, an MCU row is the same as an iMCU row. 78e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. 79e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * But at the bottom of the image, process only what's left. 80e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 81e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->comps_in_scan > 1) { 82e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_rows_per_iMCU_row = 1; 83e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 84e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) 85e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; 86e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 87e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; 88e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 89e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 90e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->mcu_ctr = 0; 91e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_vert_offset = 0; 92e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 93e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 94e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 95e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 96e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Initialize for a processing pass. 97e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 98e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 99e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(void) 100e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovstart_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) 101e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 102e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 103e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 104e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->iMCU_row_num = 0; 105e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov start_iMCU_row(cinfo); 106e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 107e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (pass_mode) { 108e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case JBUF_PASS_THRU: 109e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->whole_image[0] != NULL) 110e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 111e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->pub.compress_data = compress_data; 112e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 113e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef FULL_COEF_BUFFER_SUPPORTED 114e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case JBUF_SAVE_AND_PASS: 115e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->whole_image[0] == NULL) 116e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 117e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->pub.compress_data = compress_first_pass; 118e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 119e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case JBUF_CRANK_DEST: 120e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->whole_image[0] == NULL) 121e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 122e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->pub.compress_data = compress_output; 123e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 124e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 125e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov default: 126e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 127e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 128e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 129e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 130e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 131e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 132e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 133e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Process some data in the single-pass case. 134e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We process the equivalent of one fully interleaved MCU row ("iMCU" row) 135e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * per call, ie, v_samp_factor block rows for each component in the image. 136e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Returns TRUE if the iMCU row is completed, FALSE if suspended. 137e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 138e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * NB: input_buf contains a plane for each component in image, 139e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * which we index according to the component's SOF position. 140e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 141e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 142e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 143e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovcompress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf) 144e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 145e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 146e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION MCU_col_num; /* index of current MCU within row */ 147e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; 148e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 149e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int blkn, bi, ci, yindex, yoffset, blockcnt; 150e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION ypos, xpos; 151e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info *compptr; 152e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 153e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Loop to write as much as one whole iMCU row */ 154e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 155e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov yoffset++) { 156e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col; 157e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MCU_col_num++) { 158e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Determine where data comes from in input_buf and do the DCT thing. 159e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Each call on forward_DCT processes a horizontal row of DCT blocks 160e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks 161e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * sequentially. Dummy blocks at the right or bottom edge are filled in 162e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * specially. The data in them does not matter for image reconstruction, 163e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * so we fill them with values that will encode to the smallest amount of 164e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * data, viz: all zeroes in the AC entries, DC entries equal to previous 165e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * block's DC value. (Thanks to Thomas Kinsman for this idea.) 166e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 167e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov blkn = 0; 168e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 169e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr = cinfo->cur_comp_info[ci]; 170e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width 171e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov : compptr->last_col_width; 172e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov xpos = MCU_col_num * compptr->MCU_sample_width; 173e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ypos = yoffset * DCTSIZE; /* ypos == (yoffset+yindex) * DCTSIZE */ 174e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 175e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->iMCU_row_num < last_iMCU_row || 176e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov yoffset+yindex < compptr->last_row_height) { 177e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->fdct->forward_DCT) (cinfo, compptr, 178e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov input_buf[compptr->component_index], 179e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_buffer[blkn], 180e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ypos, xpos, (JDIMENSION) blockcnt); 181e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (blockcnt < compptr->MCU_width) { 182e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Create some dummy blocks at the right edge of the image. */ 183e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jzero_far((void FAR *) coef->MCU_buffer[blkn + blockcnt], 184e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK)); 185e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (bi = blockcnt; bi < compptr->MCU_width; bi++) { 186e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0]; 187e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 188e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 189e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 190e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Create a row of dummy blocks at the bottom of the image. */ 191e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jzero_far((void FAR *) coef->MCU_buffer[blkn], 192e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_width * SIZEOF(JBLOCK)); 193e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (bi = 0; bi < compptr->MCU_width; bi++) { 194e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0]; 195e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 196e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 197e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov blkn += compptr->MCU_width; 198e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ypos += DCTSIZE; 199e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 200e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 201e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Try to write the MCU. In event of a suspension failure, we will 202e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * re-DCT the MCU on restart (a bit inefficient, could be fixed...) 203e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 204e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) { 205e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Suspension forced; update state counters and exit */ 206e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_vert_offset = yoffset; 207e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->mcu_ctr = MCU_col_num; 208e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return FALSE; 209e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 210e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 211e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Completed an MCU row, but perhaps not an iMCU row */ 212e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->mcu_ctr = 0; 213e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 214e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Completed the iMCU row, advance counters for next one */ 215e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->iMCU_row_num++; 216e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov start_iMCU_row(cinfo); 217e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 218e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 219e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 220e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 221e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef FULL_COEF_BUFFER_SUPPORTED 222e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 223e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 224e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Process some data in the first pass of a multi-pass case. 225e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We process the equivalent of one fully interleaved MCU row ("iMCU" row) 226e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * per call, ie, v_samp_factor block rows for each component in the image. 227e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This amount of data is read from the source buffer, DCT'd and quantized, 228e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * and saved into the virtual arrays. We also generate suitable dummy blocks 229e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * as needed at the right and lower edges. (The dummy blocks are constructed 230e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * in the virtual arrays, which have been padded appropriately.) This makes 231e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * it possible for subsequent passes not to worry about real vs. dummy blocks. 232e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 233e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We must also emit the data to the entropy encoder. This is conveniently 234e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * done by calling compress_output() after we've loaded the current strip 235e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * of the virtual arrays. 236e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 237e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * NB: input_buf contains a plane for each component in image. All 238e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * components are DCT'd and loaded into the virtual arrays in this pass. 239e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * However, it may be that only a subset of the components are emitted to 240e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * the entropy encoder during this first pass; be careful about looking 241e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * at the scan-dependent variables (MCU dimensions, etc). 242e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 243e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 244e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 245e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovcompress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf) 246e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 247e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 248e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 249e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION blocks_across, MCUs_across, MCUindex; 250e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int bi, ci, h_samp_factor, block_row, block_rows, ndummy; 251e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JCOEF lastDC; 252e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info *compptr; 253e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBLOCKARRAY buffer; 254e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBLOCKROW thisblockrow, lastblockrow; 255e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 256e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 257e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ci++, compptr++) { 258e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Align the virtual buffer for this component. */ 259e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov buffer = (*cinfo->mem->access_virt_barray) 260e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ((j_common_ptr) cinfo, coef->whole_image[ci], 261e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->iMCU_row_num * compptr->v_samp_factor, 262e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) compptr->v_samp_factor, TRUE); 263e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Count non-dummy DCT block rows in this iMCU row. */ 264e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->iMCU_row_num < last_iMCU_row) 265e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov block_rows = compptr->v_samp_factor; 266e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else { 267e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* NB: can't use last_row_height here, since may not be set! */ 268e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); 269e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (block_rows == 0) block_rows = compptr->v_samp_factor; 270e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 271e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov blocks_across = compptr->width_in_blocks; 272e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov h_samp_factor = compptr->h_samp_factor; 273e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Count number of dummy blocks to be added at the right margin. */ 274e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ndummy = (int) (blocks_across % h_samp_factor); 275e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (ndummy > 0) 276e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ndummy = h_samp_factor - ndummy; 277e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Perform DCT for all non-dummy blocks in this iMCU row. Each call 278e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * on forward_DCT processes a complete horizontal row of DCT blocks. 279e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 280e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (block_row = 0; block_row < block_rows; block_row++) { 281e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisblockrow = buffer[block_row]; 282e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->fdct->forward_DCT) (cinfo, compptr, 283e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov input_buf[ci], thisblockrow, 284e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) (block_row * DCTSIZE), 285e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) 0, blocks_across); 286e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (ndummy > 0) { 287e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Create dummy blocks at the right edge of the image. */ 288e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisblockrow += blocks_across; /* => first dummy block */ 289e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jzero_far((void FAR *) thisblockrow, ndummy * SIZEOF(JBLOCK)); 290e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov lastDC = thisblockrow[-1][0]; 291e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (bi = 0; bi < ndummy; bi++) { 292e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisblockrow[bi][0] = lastDC; 293e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 294e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 295e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 296e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* If at end of image, create dummy block rows as needed. 297e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * The tricky part here is that within each MCU, we want the DC values 298e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * of the dummy blocks to match the last real block's DC value. 299e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This squeezes a few more bytes out of the resulting file... 300e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 301e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (coef->iMCU_row_num == last_iMCU_row) { 302e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov blocks_across += ndummy; /* include lower right corner */ 303e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MCUs_across = blocks_across / h_samp_factor; 304e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (block_row = block_rows; block_row < compptr->v_samp_factor; 305e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov block_row++) { 306e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisblockrow = buffer[block_row]; 307e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov lastblockrow = buffer[block_row-1]; 308e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jzero_far((void FAR *) thisblockrow, 309e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (size_t) (blocks_across * SIZEOF(JBLOCK))); 310e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) { 311e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov lastDC = lastblockrow[h_samp_factor-1][0]; 312e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (bi = 0; bi < h_samp_factor; bi++) { 313e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisblockrow[bi][0] = lastDC; 314e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 315e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisblockrow += h_samp_factor; /* advance to next MCU in row */ 316e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov lastblockrow += h_samp_factor; 317e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 318e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 319e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 320e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 321e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* NB: compress_output will increment iMCU_row_num if successful. 322e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * A suspension return will result in redoing all the work above next time. 323e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 324e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 325e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Emit data to the entropy encoder, sharing code with subsequent passes */ 326e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return compress_output(cinfo, input_buf); 327e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 328e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 329e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 330e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 331e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Process some data in subsequent passes of a multi-pass case. 332e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We process the equivalent of one fully interleaved MCU row ("iMCU" row) 333e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * per call, ie, v_samp_factor block rows for each component in the scan. 334e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * The data is obtained from the virtual arrays and fed to the entropy coder. 335e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Returns TRUE if the iMCU row is completed, FALSE if suspended. 336e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 337e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * NB: input_buf is ignored; it is likely to be a NULL pointer. 338e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 339e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 340e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(boolean) 341e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovcompress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) 342e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 343e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 344e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION MCU_col_num; /* index of current MCU within row */ 345e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int blkn, ci, xindex, yindex, yoffset; 346e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION start_col; 347e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; 348e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBLOCKROW buffer_ptr; 349e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info *compptr; 350e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 351e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Align the virtual buffers for the components used in this scan. 352e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * NB: during first pass, this is safe only because the buffers will 353e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * already be aligned properly, so jmemmgr.c won't need to do any I/O. 354e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 355e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 356e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr = cinfo->cur_comp_info[ci]; 357e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov buffer[ci] = (*cinfo->mem->access_virt_barray) 358e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], 359e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->iMCU_row_num * compptr->v_samp_factor, 360e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) compptr->v_samp_factor, FALSE); 361e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 362e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 363e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Loop to process one whole iMCU row */ 364e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 365e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov yoffset++) { 366e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; 367e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MCU_col_num++) { 368e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Construct list of pointers to DCT blocks belonging to this MCU */ 369e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov blkn = 0; /* index of current DCT block within MCU */ 370e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 371e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr = cinfo->cur_comp_info[ci]; 372e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov start_col = MCU_col_num * compptr->MCU_width; 373e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 374e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov buffer_ptr = buffer[ci][yindex+yoffset] + start_col; 375e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (xindex = 0; xindex < compptr->MCU_width; xindex++) { 376e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_buffer[blkn++] = buffer_ptr++; 377e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 378e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 379e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 380e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Try to write the MCU. */ 381e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) { 382e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Suspension forced; update state counters and exit */ 383e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_vert_offset = yoffset; 384e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->mcu_ctr = MCU_col_num; 385e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return FALSE; 386e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 387e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 388e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Completed an MCU row, but perhaps not an iMCU row */ 389e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->mcu_ctr = 0; 390e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 391e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Completed the iMCU row, advance counters for next one */ 392e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->iMCU_row_num++; 393e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov start_iMCU_row(cinfo); 394e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov return TRUE; 395e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 396e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 397e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif /* FULL_COEF_BUFFER_SUPPORTED */ 398e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 399e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 400e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 401e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Initialize coefficient buffer controller. 402e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 403e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 404e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovGLOBAL(void) 405e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovjinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer) 406e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 407e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_coef_ptr coef; 408e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 409e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef = (my_coef_ptr) 410e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 411e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov SIZEOF(my_coef_controller)); 412e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->coef = (struct jpeg_c_coef_controller *) coef; 413e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->pub.start_pass = start_pass_coef; 414e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 415e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Create the coefficient buffer. */ 416e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (need_full_buffer) { 417e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef FULL_COEF_BUFFER_SUPPORTED 418e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Allocate a full-image virtual array for each component, */ 419e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* padded to a multiple of samp_factor DCT blocks in each direction. */ 420e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int ci; 421e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info *compptr; 422e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 423e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 424e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ci++, compptr++) { 425e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->whole_image[ci] = (*cinfo->mem->request_virt_barray) 426e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, 427e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) jround_up((long) compptr->width_in_blocks, 428e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) compptr->h_samp_factor), 429e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) jround_up((long) compptr->height_in_blocks, 430e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) compptr->v_samp_factor), 431e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (JDIMENSION) compptr->v_samp_factor); 432e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 433e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#else 434e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 435e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 436e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 437e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* We only need a single-MCU buffer. */ 438e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBLOCKROW buffer; 439e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int i; 440e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 441e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov buffer = (JBLOCKROW) 442e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, 443e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 444e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { 445e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->MCU_buffer[i] = buffer + i; 446e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 447e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov coef->whole_image[0] = NULL; /* flag for no virtual arrays */ 448e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 449e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 450