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@ -5,12 +5,12 @@ |
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* This file is part of the Independent JPEG Group's software. |
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* For conditions of distribution and use, see the accompanying README file. |
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* |
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* This file contains the main buffer controller for decompression. |
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* The main buffer lies between the JPEG decompressor proper and the |
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* This file contains the main_ptr buffer controller for decompression. |
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* The main_ptr buffer lies between the JPEG decompressor proper and the |
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* post-processor; it holds downsampled data in the JPEG colorspace. |
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* |
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* Note that this code is bypassed in raw-data mode, since the application |
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* supplies the equivalent of the main buffer in that case. |
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* supplies the equivalent of the main_ptr buffer in that case. |
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*/ |
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#define JPEG_INTERNALS |
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@ -19,9 +19,9 @@ |
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/*
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* In the current system design, the main buffer need never be a full-image |
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* In the current system design, the main_ptr buffer need never be a full-image |
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* buffer; any full-height buffers will be found inside the coefficient or |
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* postprocessing controllers. Nonetheless, the main controller is not |
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* postprocessing controllers. Nonetheless, the main_ptr controller is not |
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* trivial. Its responsibility is to provide context rows for upsampling/ |
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* rescaling, and doing this in an efficient fashion is a bit tricky. |
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* |
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@ -159,7 +159,7 @@ alloc_funny_pointers (j_decompress_ptr cinfo) |
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* This is done only once, not once per pass. |
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*/ |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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int ci, rgroup; |
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int M = cinfo->min_DCT_scaled_size; |
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jpeg_component_info *compptr; |
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@ -168,10 +168,10 @@ alloc_funny_pointers (j_decompress_ptr cinfo) |
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/* Get top-level space for component array pointers.
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* We alloc both arrays with one call to save a few cycles. |
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*/ |
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main->xbuffer[0] = (JSAMPIMAGE) |
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main_ptr->xbuffer[0] = (JSAMPIMAGE) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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cinfo->num_components * 2 * SIZEOF(JSAMPARRAY)); |
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main->xbuffer[1] = main->xbuffer[0] + cinfo->num_components; |
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main_ptr->xbuffer[1] = main_ptr->xbuffer[0] + cinfo->num_components; |
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for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
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ci++, compptr++) { |
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@ -184,9 +184,9 @@ alloc_funny_pointers (j_decompress_ptr cinfo) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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2 * (rgroup * (M + 4)) * SIZEOF(JSAMPROW)); |
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xbuf += rgroup; /* want one row group at negative offsets */ |
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main->xbuffer[0][ci] = xbuf; |
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main_ptr->xbuffer[0][ci] = xbuf; |
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xbuf += rgroup * (M + 4); |
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main->xbuffer[1][ci] = xbuf; |
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main_ptr->xbuffer[1][ci] = xbuf; |
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} |
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} |
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@ -194,13 +194,13 @@ alloc_funny_pointers (j_decompress_ptr cinfo) |
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LOCAL(void) |
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make_funny_pointers (j_decompress_ptr cinfo) |
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/* Create the funny pointer lists discussed in the comments above.
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* The actual workspace is already allocated (in main->buffer), |
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* The actual workspace is already allocated (in main_ptr->buffer), |
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* and the space for the pointer lists is allocated too. |
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* This routine just fills in the curiously ordered lists. |
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* This will be repeated at the beginning of each pass. |
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*/ |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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int ci, i, rgroup; |
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int M = cinfo->min_DCT_scaled_size; |
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jpeg_component_info *compptr; |
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@ -210,10 +210,10 @@ make_funny_pointers (j_decompress_ptr cinfo) |
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ci++, compptr++) { |
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rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / |
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cinfo->min_DCT_scaled_size; /* height of a row group of component */ |
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xbuf0 = main->xbuffer[0][ci]; |
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xbuf1 = main->xbuffer[1][ci]; |
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xbuf0 = main_ptr->xbuffer[0][ci]; |
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xbuf1 = main_ptr->xbuffer[1][ci]; |
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/* First copy the workspace pointers as-is */ |
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buf = main->buffer[ci]; |
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buf = main_ptr->buffer[ci]; |
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for (i = 0; i < rgroup * (M + 2); i++) { |
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xbuf0[i] = xbuf1[i] = buf[i]; |
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} |
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@ -240,7 +240,7 @@ set_wraparound_pointers (j_decompress_ptr cinfo) |
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* This changes the pointer list state from top-of-image to the normal state. |
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*/ |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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int ci, i, rgroup; |
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int M = cinfo->min_DCT_scaled_size; |
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jpeg_component_info *compptr; |
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@ -250,8 +250,8 @@ set_wraparound_pointers (j_decompress_ptr cinfo) |
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ci++, compptr++) { |
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rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / |
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cinfo->min_DCT_scaled_size; /* height of a row group of component */ |
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xbuf0 = main->xbuffer[0][ci]; |
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xbuf1 = main->xbuffer[1][ci]; |
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xbuf0 = main_ptr->xbuffer[0][ci]; |
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xbuf1 = main_ptr->xbuffer[1][ci]; |
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for (i = 0; i < rgroup; i++) { |
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xbuf0[i - rgroup] = xbuf0[rgroup*(M+1) + i]; |
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xbuf1[i - rgroup] = xbuf1[rgroup*(M+1) + i]; |
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@ -269,7 +269,7 @@ set_bottom_pointers (j_decompress_ptr cinfo) |
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* Also sets rowgroups_avail to indicate number of nondummy row groups in row. |
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*/ |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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int ci, i, rgroup, iMCUheight, rows_left; |
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jpeg_component_info *compptr; |
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JSAMPARRAY xbuf; |
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@ -286,12 +286,12 @@ set_bottom_pointers (j_decompress_ptr cinfo) |
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* so we need only do it once. |
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*/ |
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if (ci == 0) { |
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main->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1); |
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main_ptr->rowgroups_avail = (JDIMENSION) ((rows_left-1) / rgroup + 1); |
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} |
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/* Duplicate the last real sample row rgroup*2 times; this pads out the
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* last partial rowgroup and ensures at least one full rowgroup of context. |
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*/ |
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xbuf = main->xbuffer[main->whichptr][ci]; |
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xbuf = main_ptr->xbuffer[main_ptr->whichptr][ci]; |
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for (i = 0; i < rgroup * 2; i++) { |
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xbuf[rows_left + i] = xbuf[rows_left-1]; |
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} |
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@ -306,27 +306,27 @@ set_bottom_pointers (j_decompress_ptr cinfo) |
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METHODDEF(void) |
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start_pass_main (j_decompress_ptr cinfo, J_BUF_MODE pass_mode) |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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switch (pass_mode) { |
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case JBUF_PASS_THRU: |
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if (cinfo->upsample->need_context_rows) { |
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main->pub.process_data = process_data_context_main; |
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main_ptr->pub.process_data = process_data_context_main; |
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make_funny_pointers(cinfo); /* Create the xbuffer[] lists */ |
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main->whichptr = 0; /* Read first iMCU row into xbuffer[0] */ |
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main->context_state = CTX_PREPARE_FOR_IMCU; |
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main->iMCU_row_ctr = 0; |
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main_ptr->whichptr = 0; /* Read first iMCU row into xbuffer[0] */ |
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main_ptr->context_state = CTX_PREPARE_FOR_IMCU; |
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main_ptr->iMCU_row_ctr = 0; |
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} else { |
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/* Simple case with no context needed */ |
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main->pub.process_data = process_data_simple_main; |
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main_ptr->pub.process_data = process_data_simple_main; |
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} |
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main->buffer_full = FALSE; /* Mark buffer empty */ |
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main->rowgroup_ctr = 0; |
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main_ptr->buffer_full = FALSE; /* Mark buffer empty */ |
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main_ptr->rowgroup_ctr = 0; |
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break; |
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#ifdef QUANT_2PASS_SUPPORTED |
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case JBUF_CRANK_DEST: |
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/* For last pass of 2-pass quantization, just crank the postprocessor */ |
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main->pub.process_data = process_data_crank_post; |
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main_ptr->pub.process_data = process_data_crank_post; |
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break; |
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#endif |
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default: |
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@ -346,14 +346,14 @@ process_data_simple_main (j_decompress_ptr cinfo, |
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, |
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JDIMENSION out_rows_avail) |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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JDIMENSION rowgroups_avail; |
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/* Read input data if we haven't filled the main buffer yet */ |
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if (! main->buffer_full) { |
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if (! (*cinfo->coef->decompress_data) (cinfo, main->buffer)) |
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/* Read input data if we haven't filled the main_ptr buffer yet */ |
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if (! main_ptr->buffer_full) { |
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if (! (*cinfo->coef->decompress_data) (cinfo, main_ptr->buffer)) |
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return; /* suspension forced, can do nothing more */ |
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main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ |
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main_ptr->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ |
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} |
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/* There are always min_DCT_scaled_size row groups in an iMCU row. */ |
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@ -364,14 +364,14 @@ process_data_simple_main (j_decompress_ptr cinfo, |
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*/ |
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/* Feed the postprocessor */ |
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(*cinfo->post->post_process_data) (cinfo, main->buffer, |
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&main->rowgroup_ctr, rowgroups_avail, |
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(*cinfo->post->post_process_data) (cinfo, main_ptr->buffer, |
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&main_ptr->rowgroup_ctr, rowgroups_avail, |
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output_buf, out_row_ctr, out_rows_avail); |
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/* Has postprocessor consumed all the data yet? If so, mark buffer empty */ |
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if (main->rowgroup_ctr >= rowgroups_avail) { |
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main->buffer_full = FALSE; |
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main->rowgroup_ctr = 0; |
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if (main_ptr->rowgroup_ctr >= rowgroups_avail) { |
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main_ptr->buffer_full = FALSE; |
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main_ptr->rowgroup_ctr = 0; |
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} |
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} |
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@ -386,15 +386,15 @@ process_data_context_main (j_decompress_ptr cinfo, |
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JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, |
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JDIMENSION out_rows_avail) |
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{ |
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my_main_ptr main = (my_main_ptr) cinfo->main; |
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my_main_ptr main_ptr = (my_main_ptr) cinfo->main; |
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/* Read input data if we haven't filled the main buffer yet */ |
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if (! main->buffer_full) { |
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/* Read input data if we haven't filled the main_ptr buffer yet */ |
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if (! main_ptr->buffer_full) { |
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if (! (*cinfo->coef->decompress_data) (cinfo, |
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main->xbuffer[main->whichptr])) |
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main_ptr->xbuffer[main_ptr->whichptr])) |
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return; /* suspension forced, can do nothing more */ |
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main->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ |
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main->iMCU_row_ctr++; /* count rows received */ |
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main_ptr->buffer_full = TRUE; /* OK, we have an iMCU row to work with */ |
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main_ptr->iMCU_row_ctr++; /* count rows received */ |
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} |
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/* Postprocessor typically will not swallow all the input data it is handed
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@ -402,47 +402,47 @@ process_data_context_main (j_decompress_ptr cinfo, |
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* to exit and restart. This switch lets us keep track of how far we got. |
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* Note that each case falls through to the next on successful completion. |
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*/ |
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switch (main->context_state) { |
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switch (main_ptr->context_state) { |
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case CTX_POSTPONED_ROW: |
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/* Call postprocessor using previously set pointers for postponed row */ |
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(*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr], |
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&main->rowgroup_ctr, main->rowgroups_avail, |
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(*cinfo->post->post_process_data) (cinfo, main_ptr->xbuffer[main_ptr->whichptr], |
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&main_ptr->rowgroup_ctr, main_ptr->rowgroups_avail, |
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output_buf, out_row_ctr, out_rows_avail); |
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if (main->rowgroup_ctr < main->rowgroups_avail) |
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if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail) |
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return; /* Need to suspend */ |
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main->context_state = CTX_PREPARE_FOR_IMCU; |
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main_ptr->context_state = CTX_PREPARE_FOR_IMCU; |
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if (*out_row_ctr >= out_rows_avail) |
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return; /* Postprocessor exactly filled output buf */ |
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/*FALLTHROUGH*/ |
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case CTX_PREPARE_FOR_IMCU: |
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/* Prepare to process first M-1 row groups of this iMCU row */ |
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main->rowgroup_ctr = 0; |
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main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size - 1); |
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main_ptr->rowgroup_ctr = 0; |
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main_ptr->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size - 1); |
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/* Check for bottom of image: if so, tweak pointers to "duplicate"
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* the last sample row, and adjust rowgroups_avail to ignore padding rows. |
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*/ |
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if (main->iMCU_row_ctr == cinfo->total_iMCU_rows) |
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if (main_ptr->iMCU_row_ctr == cinfo->total_iMCU_rows) |
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set_bottom_pointers(cinfo); |
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main->context_state = CTX_PROCESS_IMCU; |
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main_ptr->context_state = CTX_PROCESS_IMCU; |
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/*FALLTHROUGH*/ |
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case CTX_PROCESS_IMCU: |
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/* Call postprocessor using previously set pointers */ |
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(*cinfo->post->post_process_data) (cinfo, main->xbuffer[main->whichptr], |
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&main->rowgroup_ctr, main->rowgroups_avail, |
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(*cinfo->post->post_process_data) (cinfo, main_ptr->xbuffer[main_ptr->whichptr], |
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&main_ptr->rowgroup_ctr, main_ptr->rowgroups_avail, |
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output_buf, out_row_ctr, out_rows_avail); |
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if (main->rowgroup_ctr < main->rowgroups_avail) |
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if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail) |
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return; /* Need to suspend */ |
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/* After the first iMCU, change wraparound pointers to normal state */ |
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if (main->iMCU_row_ctr == 1) |
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if (main_ptr->iMCU_row_ctr == 1) |
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set_wraparound_pointers(cinfo); |
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/* Prepare to load new iMCU row using other xbuffer list */ |
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main->whichptr ^= 1; /* 0=>1 or 1=>0 */ |
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main->buffer_full = FALSE; |
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main_ptr->whichptr ^= 1; /* 0=>1 or 1=>0 */ |
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main_ptr->buffer_full = FALSE; |
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/* Still need to process last row group of this iMCU row, */ |
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/* which is saved at index M+1 of the other xbuffer */ |
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main->rowgroup_ctr = (JDIMENSION) (cinfo->min_DCT_scaled_size + 1); |
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main->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size + 2); |
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main->context_state = CTX_POSTPONED_ROW; |
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main_ptr->rowgroup_ctr = (JDIMENSION) (cinfo->min_DCT_scaled_size + 1); |
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main_ptr->rowgroups_avail = (JDIMENSION) (cinfo->min_DCT_scaled_size + 2); |
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main_ptr->context_state = CTX_POSTPONED_ROW; |
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} |
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} |
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@ -469,21 +469,21 @@ process_data_crank_post (j_decompress_ptr cinfo, |
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/*
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* Initialize main buffer controller. |
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* Initialize main_ptr buffer controller. |
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*/ |
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GLOBAL(void) |
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jinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer) |
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{ |
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my_main_ptr main; |
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my_main_ptr main_ptr; |
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int ci, rgroup, ngroups; |
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jpeg_component_info *compptr; |
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main = (my_main_ptr) |
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main_ptr = (my_main_ptr) |
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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SIZEOF(my_main_controller)); |
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cinfo->main = (struct jpeg_d_main_controller *) main; |
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main->pub.start_pass = start_pass_main; |
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cinfo->main = (struct jpeg_d_main_controller *) main_ptr; |
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main_ptr->pub.start_pass = start_pass_main; |
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if (need_full_buffer) /* shouldn't happen */ |
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ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); |
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@ -504,7 +504,7 @@ jinit_d_main_controller (j_decompress_ptr cinfo, boolean need_full_buffer) |
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ci++, compptr++) { |
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rgroup = (compptr->v_samp_factor * compptr->DCT_scaled_size) / |
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cinfo->min_DCT_scaled_size; /* height of a row group of component */ |
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main->buffer[ci] = (*cinfo->mem->alloc_sarray) |
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main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray) |
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((j_common_ptr) cinfo, JPOOL_IMAGE, |
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compptr->width_in_blocks * compptr->DCT_scaled_size, |
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(JDIMENSION) (rgroup * ngroups)); |
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