X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;f=src%2Fjpeg%2Flibijg%2Fjdmainct.c;h=43cb09b719e48f297974d8c8a1babbe797166741;hb=c4220b95e9d5e902a7468e408435bf6dea4950eb;hp=13c956f5deb7da999d6d22c0bc25b81751b96815;hpb=a26e6f06a76ec85504cf65288e7c47f2cd728641;p=gdcm.git diff --git a/src/jpeg/libijg/jdmainct.c b/src/jpeg/libijg/jdmainct.c index 13c956f5..43cb09b7 100644 --- a/src/jpeg/libijg/jdmainct.c +++ b/src/jpeg/libijg/jdmainct.c @@ -1,7 +1,7 @@ /* * jdmainct.c * - * Copyright (C) 1994-1996, Thomas G. Lane. + * Copyright (C) 1994-1998, 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. * @@ -26,18 +26,18 @@ * rescaling, and doing this in an efficient fashion is a bit tricky. * * Postprocessor input data is counted in "row groups". A row group - * is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size) - * sample rows of each component. (We require DCT_scaled_size values to be - * chosen such that these numbers are integers. In practice DCT_scaled_size + * is defined to be (v_samp_factor * codec_data_unit / min_codec_data_unit) + * sample rows of each component. (We require codec_data_unit values to be + * chosen such that these numbers are integers. In practice codec_data_unit * values will likely be powers of two, so we actually have the stronger - * condition that DCT_scaled_size / min_DCT_scaled_size is an integer.) + * condition that codec_data_unit / min_codec_data_unit is an integer.) * Upsampling will typically produce max_v_samp_factor pixel rows from each * row group (times any additional scale factor that the upsampler is * applying). * - * The coefficient controller will deliver data to us one iMCU row at a time; - * each iMCU row contains v_samp_factor * DCT_scaled_size sample rows, or - * exactly min_DCT_scaled_size row groups. (This amount of data corresponds + * The decompression codec will deliver data to us one iMCU row at a time; + * each iMCU row contains v_samp_factor * codec_data_unit sample rows, or + * exactly min_codec_data_unit row groups. (This amount of data corresponds * to one row of MCUs when the image is fully interleaved.) Note that the * number of sample rows varies across components, but the number of row * groups does not. Some garbage sample rows may be included in the last iMCU @@ -64,7 +64,7 @@ * supporting arbitrary output rescaling might wish for more than one row * group of context when shrinking the image; tough, we don't handle that. * (This is justified by the assumption that downsizing will be handled mostly - * by adjusting the DCT_scaled_size values, so that the actual scale factor at + * by adjusting the codec_data_unit values, so that the actual scale factor at * the upsample step needn't be much less than one.) * * To provide the desired context, we have to retain the last two row groups @@ -74,7 +74,7 @@ * We could do this most simply by copying data around in our buffer, but * that'd be very slow. We can avoid copying any data by creating a rather * strange pointer structure. Here's how it works. We allocate a workspace - * consisting of M+2 row groups (where M = min_DCT_scaled_size is the number + * consisting of M+2 row groups (where M = min_codec_data_unit is the number * of row groups per iMCU row). We create two sets of redundant pointers to * the workspace. Labeling the physical row groups 0 to M+1, the synthesized * pointer lists look like this: @@ -99,11 +99,11 @@ * the first or last sample row as necessary (this is cheaper than copying * sample rows around). * - * This scheme breaks down if M < 2, ie, min_DCT_scaled_size is 1. In that + * This scheme breaks down if M < 2, ie, min_codec_data_unit is 1. In that * situation each iMCU row provides only one row group so the buffering logic * must be different (eg, we must read two iMCU rows before we can emit the * first row group). For now, we simply do not support providing context - * rows when min_DCT_scaled_size is 1. That combination seems unlikely to + * rows when min_codec_data_unit is 1. That combination seems unlikely to * be worth providing --- if someone wants a 1/8th-size preview, they probably * want it quick and dirty, so a context-free upsampler is sufficient. */ @@ -117,39 +117,39 @@ typedef struct { /* Pointer to allocated workspace (M or M+2 row groups). */ JSAMPARRAY buffer[MAX_COMPONENTS]; - boolean buffer_full; /* Have we gotten an iMCU row from decoder? */ - JDIMENSION rowgroup_ctr; /* counts row groups output to postprocessor */ + boolean buffer_full; /* Have we gotten an iMCU row from decoder? */ + JDIMENSION rowgroup_ctr; /* counts row groups output to postprocessor */ /* Remaining fields are only used in the context case. */ /* These are the master pointers to the funny-order pointer lists. */ - JSAMPIMAGE xbuffer[2]; /* pointers to weird pointer lists */ + JSAMPIMAGE xbuffer[2]; /* pointers to weird pointer lists */ - int whichptr; /* indicates which pointer set is now in use */ - int context_state; /* process_data state machine status */ - JDIMENSION rowgroups_avail; /* row groups available to postprocessor */ - JDIMENSION iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */ + int whichptr; /* indicates which pointer set is now in use */ + int context_state; /* process_data state machine status */ + JDIMENSION rowgroups_avail; /* row groups available to postprocessor */ + JDIMENSION iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */ } my_main_controller; typedef my_main_controller * my_main_ptr; /* context_state values: */ -#define CTX_PREPARE_FOR_IMCU 0 /* need to prepare for MCU row */ -#define CTX_PROCESS_IMCU 1 /* feeding iMCU to postprocessor */ -#define CTX_POSTPONED_ROW 2 /* feeding postponed row group */ +#define CTX_PREPARE_FOR_IMCU 0 /* need to prepare for MCU row */ +#define CTX_PROCESS_IMCU 1 /* feeding iMCU to postprocessor */ +#define CTX_POSTPONED_ROW 2 /* feeding postponed row group */ /* Forward declarations */ METHODDEF(void) process_data_simple_main - JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, - JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); + JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, + JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); METHODDEF(void) process_data_context_main - JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, - JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); + JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, + JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); #ifdef QUANT_2PASS_SUPPORTED METHODDEF(void) process_data_crank_post - JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, - JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); + JPP((j_decompress_ptr cinfo, JSAMPARRAY output_buf, + JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)); #endif @@ -159,34 +159,34 @@ alloc_funny_pointers (j_decompress_ptr cinfo) * This is done only once, not once per pass. */ { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; int ci, rgroup; - int M = cinfo->min_DCT_scaled_size; + int M = cinfo->min_codec_data_unit; jpeg_component_info *compptr; JSAMPARRAY xbuf; /* Get top-level space for component array pointers. * We alloc both arrays with one call to save a few cycles. */ - main->xbuffer[0] = (JSAMPIMAGE) + mainPtr->xbuffer[0] = (JSAMPIMAGE) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - cinfo->num_components * 2 * SIZEOF(JSAMPARRAY)); - main->xbuffer[1] = main->xbuffer[0] + cinfo->num_components; + cinfo->num_components * 2 * SIZEOF(JSAMPARRAY)); + mainPtr->xbuffer[1] = mainPtr->xbuffer[0] + cinfo->num_components; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { - rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / - cinfo->min_DCT_scaled_size; /* height of a row group of component */ + rgroup = (compptr->v_samp_factor * compptr->codec_data_unit) / + cinfo->min_codec_data_unit; /* height of a row group of component */ /* Get space for pointer lists --- M+4 row groups in each list. * We alloc both pointer lists with one call to save a few cycles. */ xbuf = (JSAMPARRAY) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - 2 * (rgroup * (M + 4)) * SIZEOF(JSAMPROW)); - xbuf += rgroup; /* want one row group at negative offsets */ - main->xbuffer[0][ci] = xbuf; + 2 * (rgroup * (M + 4)) * SIZEOF(JSAMPROW)); + xbuf += rgroup; /* want one row group at negative offsets */ + mainPtr->xbuffer[0][ci] = xbuf; xbuf += rgroup * (M + 4); - main->xbuffer[1][ci] = xbuf; + mainPtr->xbuffer[1][ci] = xbuf; } } @@ -194,26 +194,26 @@ alloc_funny_pointers (j_decompress_ptr cinfo) LOCAL(void) make_funny_pointers (j_decompress_ptr cinfo) /* Create the funny pointer lists discussed in the comments above. - * The actual workspace is already allocated (in main->buffer), + * The actual workspace is already allocated (in mainPtr->buffer), * and the space for the pointer lists is allocated too. * This routine just fills in the curiously ordered lists. * This will be repeated at the beginning of each pass. */ { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; int ci, i, rgroup; - int M = cinfo->min_DCT_scaled_size; + int M = cinfo->min_codec_data_unit; jpeg_component_info *compptr; JSAMPARRAY buf, xbuf0, xbuf1; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { - rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / - cinfo->min_DCT_scaled_size; /* height of a row group of component */ - xbuf0 = main->xbuffer[0][ci]; - xbuf1 = main->xbuffer[1][ci]; + rgroup = (compptr->v_samp_factor * compptr->codec_data_unit) / + cinfo->min_codec_data_unit; /* height of a row group of component */ + xbuf0 = mainPtr->xbuffer[0][ci]; + xbuf1 = mainPtr->xbuffer[1][ci]; /* First copy the workspace pointers as-is */ - buf = main->buffer[ci]; + buf = mainPtr->buffer[ci]; for (i = 0; i < rgroup * (M + 2); i++) { xbuf0[i] = xbuf1[i] = buf[i]; } @@ -240,18 +240,18 @@ set_wraparound_pointers (j_decompress_ptr cinfo) * This changes the pointer list state from top-of-image to the normal state. */ { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; int ci, i, rgroup; - int M = cinfo->min_DCT_scaled_size; + int M = cinfo->min_codec_data_unit; jpeg_component_info *compptr; JSAMPARRAY xbuf0, xbuf1; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { - rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / - cinfo->min_DCT_scaled_size; /* height of a row group of component */ - xbuf0 = main->xbuffer[0][ci]; - xbuf1 = main->xbuffer[1][ci]; + rgroup = (compptr->v_samp_factor * compptr->codec_data_unit) / + cinfo->min_codec_data_unit; /* height of a row group of component */ + xbuf0 = mainPtr->xbuffer[0][ci]; + xbuf1 = mainPtr->xbuffer[1][ci]; for (i = 0; i < rgroup; i++) { xbuf0[i - rgroup] = xbuf0[rgroup*(M+1) + i]; xbuf1[i - rgroup] = xbuf1[rgroup*(M+1) + i]; @@ -269,7 +269,7 @@ set_bottom_pointers (j_decompress_ptr cinfo) * Also sets rowgroups_avail to indicate number of nondummy row groups in row. */ { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; int ci, i, rgroup, iMCUheight, rows_left; jpeg_component_info *compptr; JSAMPARRAY xbuf; @@ -277,8 +277,8 @@ set_bottom_pointers (j_decompress_ptr cinfo) for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { /* Count sample rows in one iMCU row and in one row group */ - iMCUheight = compptr->v_samp_factor * compptr->DCT_scaled_size; - rgroup = iMCUheight / cinfo->min_DCT_scaled_size; + iMCUheight = compptr->v_samp_factor * compptr->codec_data_unit; + rgroup = iMCUheight / cinfo->min_codec_data_unit; /* Count nondummy sample rows remaining for this component */ rows_left = (int) (compptr->downsampled_height % (JDIMENSION) iMCUheight); if (rows_left == 0) rows_left = iMCUheight; @@ -286,12 +286,12 @@ set_bottom_pointers (j_decompress_ptr cinfo) * so we need only do it once. */ if (ci == 0) { - main->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1); + mainPtr->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1); } /* Duplicate the last real sample row rgroup*2 times; this pads out the * last partial rowgroup and ensures at least one full rowgroup of context. */ - xbuf = main->xbuffer[main->whichptr][ci]; + xbuf = mainPtr->xbuffer[mainPtr->whichptr][ci]; for (i = 0; i < rgroup * 2; i++) { xbuf[rows_left + i] = xbuf[rows_left-1]; } @@ -306,27 +306,27 @@ set_bottom_pointers (j_decompress_ptr cinfo) METHODDEF(void) start_pass_main (j_decompress_ptr cinfo, J_BUF_MODE pass_mode) { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; switch (pass_mode) { case JBUF_PASS_THRU: if (cinfo->upsample->need_context_rows) { - main->pub.process_data = process_data_context_main; + mainPtr->pub.process_data = process_data_context_main; make_funny_pointers(cinfo); /* Create the xbuffer[] lists */ - main->whichptr = 0; /* Read first iMCU row into xbuffer[0] */ - main->context_state = CTX_PREPARE_FOR_IMCU; - main->iMCU_row_ctr = 0; + mainPtr->whichptr = 0; /* Read first iMCU row into xbuffer[0] */ + mainPtr->context_state = CTX_PREPARE_FOR_IMCU; + mainPtr->iMCU_row_ctr = 0; } else { /* Simple case with no context needed */ - main->pub.process_data = process_data_simple_main; + mainPtr->pub.process_data = process_data_simple_main; } - main->buffer_full = FALSE; /* Mark buffer empty */ - main->rowgroup_ctr = 0; + mainPtr->buffer_full = FALSE; /* Mark buffer empty */ + mainPtr->rowgroup_ctr = 0; break; #ifdef QUANT_2PASS_SUPPORTED case JBUF_CRANK_DEST: /* For last pass of 2-pass quantization, just crank the postprocessor */ - main->pub.process_data = process_data_crank_post; + mainPtr->pub.process_data = process_data_crank_post; break; #endif default: @@ -343,35 +343,35 @@ start_pass_main (j_decompress_ptr cinfo, J_BUF_MODE pass_mode) METHODDEF(void) process_data_simple_main (j_decompress_ptr cinfo, - JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, - JDIMENSION out_rows_avail) + JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, + JDIMENSION out_rows_avail) { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; JDIMENSION rowgroups_avail; /* Read input data if we haven't filled the main buffer yet */ - if (! main->buffer_full) { - if (! (*cinfo->coef->decompress_data) (cinfo, main->buffer)) - return; /* suspension forced, can do nothing more */ - main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ + if (! mainPtr->buffer_full) { + if (! (*cinfo->codec->decompress_data) (cinfo, mainPtr->buffer)) + return; /* suspension forced, can do nothing more */ + mainPtr->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ } - /* There are always min_DCT_scaled_size row groups in an iMCU row. */ - rowgroups_avail = (JDIMENSION) cinfo->min_DCT_scaled_size; + /* There are always min_codec_data_unit row groups in an iMCU row. */ + rowgroups_avail = (JDIMENSION) cinfo->min_codec_data_unit; /* Note: at the bottom of the image, we may pass extra garbage row groups * to the postprocessor. The postprocessor has to check for bottom * of image anyway (at row resolution), so no point in us doing it too. */ /* Feed the postprocessor */ - (*cinfo->post->post_process_data) (cinfo, main->buffer, - &main->rowgroup_ctr, rowgroups_avail, - output_buf, out_row_ctr, out_rows_avail); + (*cinfo->post->post_process_data) (cinfo, mainPtr->buffer, + &mainPtr->rowgroup_ctr, rowgroups_avail, + output_buf, out_row_ctr, out_rows_avail); /* Has postprocessor consumed all the data yet? If so, mark buffer empty */ - if (main->rowgroup_ctr >= rowgroups_avail) { - main->buffer_full = FALSE; - main->rowgroup_ctr = 0; + if (mainPtr->rowgroup_ctr >= rowgroups_avail) { + mainPtr->buffer_full = FALSE; + mainPtr->rowgroup_ctr = 0; } } @@ -383,18 +383,18 @@ process_data_simple_main (j_decompress_ptr cinfo, METHODDEF(void) process_data_context_main (j_decompress_ptr cinfo, - JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, - JDIMENSION out_rows_avail) + JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, + JDIMENSION out_rows_avail) { - my_main_ptr main = (my_main_ptr) cinfo->main; + my_main_ptr mainPtr = (my_main_ptr) cinfo->main; /* Read input data if we haven't filled the main buffer yet */ - if (! main->buffer_full) { - if (! (*cinfo->coef->decompress_data) (cinfo, - main->xbuffer[main->whichptr])) - return; /* suspension forced, can do nothing more */ - main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ - main->iMCU_row_ctr++; /* count rows received */ + if (! mainPtr->buffer_full) { + if (! (*cinfo->codec->decompress_data) (cinfo, + mainPtr->xbuffer[mainPtr->whichptr])) + return; /* suspension forced, can do nothing more */ + mainPtr->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ + mainPtr->iMCU_row_ctr++; /* count rows received */ } /* Postprocessor typically will not swallow all the input data it is handed @@ -402,47 +402,47 @@ process_data_context_main (j_decompress_ptr cinfo, * to exit and restart. This switch lets us keep track of how far we got. * Note that each case falls through to the next on successful completion. */ - switch (main->context_state) { + switch (mainPtr->context_state) { case CTX_POSTPONED_ROW: /* Call postprocessor using previously set pointers for postponed row */ - (*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr], - &main->rowgroup_ctr, main->rowgroups_avail, - output_buf, out_row_ctr, out_rows_avail); - if (main->rowgroup_ctr < main->rowgroups_avail) - return; /* Need to suspend */ - main->context_state = CTX_PREPARE_FOR_IMCU; + (*cinfo->post->post_process_data) (cinfo, mainPtr->xbuffer[mainPtr->whichptr], + &mainPtr->rowgroup_ctr, mainPtr->rowgroups_avail, + output_buf, out_row_ctr, out_rows_avail); + if (mainPtr->rowgroup_ctr < mainPtr->rowgroups_avail) + return; /* Need to suspend */ + mainPtr->context_state = CTX_PREPARE_FOR_IMCU; if (*out_row_ctr >= out_rows_avail) - return; /* Postprocessor exactly filled output buf */ + return; /* Postprocessor exactly filled output buf */ /*FALLTHROUGH*/ case CTX_PREPARE_FOR_IMCU: /* Prepare to process first M-1 row groups of this iMCU row */ - main->rowgroup_ctr = 0; - main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size - 1); + mainPtr->rowgroup_ctr = 0; + mainPtr->rowgroups_avail = (JDIMENSION) (cinfo->min_codec_data_unit - 1); /* Check for bottom of image: if so, tweak pointers to "duplicate" * the last sample row, and adjust rowgroups_avail to ignore padding rows. */ - if (main->iMCU_row_ctr == cinfo->total_iMCU_rows) + if (mainPtr->iMCU_row_ctr == cinfo->total_iMCU_rows) set_bottom_pointers(cinfo); - main->context_state = CTX_PROCESS_IMCU; + mainPtr->context_state = CTX_PROCESS_IMCU; /*FALLTHROUGH*/ case CTX_PROCESS_IMCU: /* Call postprocessor using previously set pointers */ - (*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr], - &main->rowgroup_ctr, main->rowgroups_avail, - output_buf, out_row_ctr, out_rows_avail); - if (main->rowgroup_ctr < main->rowgroups_avail) - return; /* Need to suspend */ + (*cinfo->post->post_process_data) (cinfo, mainPtr->xbuffer[mainPtr->whichptr], + &mainPtr->rowgroup_ctr, mainPtr->rowgroups_avail, + output_buf, out_row_ctr, out_rows_avail); + if (mainPtr->rowgroup_ctr < mainPtr->rowgroups_avail) + return; /* Need to suspend */ /* After the first iMCU, change wraparound pointers to normal state */ - if (main->iMCU_row_ctr == 1) + if (mainPtr->iMCU_row_ctr == 1) set_wraparound_pointers(cinfo); /* Prepare to load new iMCU row using other xbuffer list */ - main->whichptr ^= 1; /* 0=>1 or 1=>0 */ - main->buffer_full = FALSE; + mainPtr->whichptr ^= 1; /* 0=>1 or 1=>0 */ + mainPtr->buffer_full = FALSE; /* Still need to process last row group of this iMCU row, */ /* which is saved at index M+1 of the other xbuffer */ - main->rowgroup_ctr = (JDIMENSION) (cinfo->min_DCT_scaled_size + 1); - main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size + 2); - main->context_state = CTX_POSTPONED_ROW; + mainPtr->rowgroup_ctr = (JDIMENSION) (cinfo->min_codec_data_unit + 1); + mainPtr->rowgroups_avail = (JDIMENSION) (cinfo->min_codec_data_unit + 2); + mainPtr->context_state = CTX_POSTPONED_ROW; } } @@ -457,12 +457,12 @@ process_data_context_main (j_decompress_ptr cinfo, METHODDEF(void) process_data_crank_post (j_decompress_ptr cinfo, - JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, - JDIMENSION out_rows_avail) + JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, + JDIMENSION out_rows_avail) { (*cinfo->post->post_process_data) (cinfo, (JSAMPIMAGE) NULL, - (JDIMENSION *) NULL, (JDIMENSION) 0, - output_buf, out_row_ctr, out_rows_avail); + (JDIMENSION *) NULL, (JDIMENSION) 0, + output_buf, out_row_ctr, out_rows_avail); } #endif /* QUANT_2PASS_SUPPORTED */ @@ -475,38 +475,38 @@ process_data_crank_post (j_decompress_ptr cinfo, GLOBAL(void) jinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer) { - my_main_ptr main; + my_main_ptr mainPtr; int ci, rgroup, ngroups; jpeg_component_info *compptr; - main = (my_main_ptr) + mainPtr = (my_main_ptr) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF(my_main_controller)); - cinfo->main = (struct jpeg_d_main_controller *) main; - main->pub.start_pass = start_pass_main; + SIZEOF(my_main_controller)); + cinfo->main = (struct jpeg_d_main_controller *) mainPtr; + mainPtr->pub.start_pass = start_pass_main; - if (need_full_buffer) /* shouldn't happen */ + if (need_full_buffer) /* shouldn't happen */ ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); /* Allocate the workspace. * ngroups is the number of row groups we need. */ if (cinfo->upsample->need_context_rows) { - if (cinfo->min_DCT_scaled_size < 2) /* unsupported, see comments above */ + if (cinfo->min_codec_data_unit < 2) /* unsupported, see comments above */ ERREXIT(cinfo, JERR_NOTIMPL); alloc_funny_pointers(cinfo); /* Alloc space for xbuffer[] lists */ - ngroups = cinfo->min_DCT_scaled_size + 2; + ngroups = cinfo->min_codec_data_unit + 2; } else { - ngroups = cinfo->min_DCT_scaled_size; + ngroups = cinfo->min_codec_data_unit; } for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { - rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / - cinfo->min_DCT_scaled_size; /* height of a row group of component */ - main->buffer[ci] = (*cinfo->mem->alloc_sarray) - ((j_common_ptr) cinfo, JPOOL_IMAGE, - compptr->width_in_blocks * compptr->DCT_scaled_size, - (JDIMENSION) (rgroup * ngroups)); + rgroup = (compptr->v_samp_factor * compptr->codec_data_unit) / + cinfo->min_codec_data_unit; /* height of a row group of component */ + mainPtr->buffer[ci] = (*cinfo->mem->alloc_sarray) + ((j_common_ptr) cinfo, JPOOL_IMAGE, + compptr->width_in_data_units * compptr->codec_data_unit, + (JDIMENSION) (rgroup * ngroups)); } }