diff options
Diffstat (limited to '3rdparty/libjpeg/jdcoefct.c')
-rw-r--r-- | 3rdparty/libjpeg/jdcoefct.c | 113 |
1 files changed, 58 insertions, 55 deletions
diff --git a/3rdparty/libjpeg/jdcoefct.c b/3rdparty/libjpeg/jdcoefct.c index ed02fc378f5..79ba4201408 100644 --- a/3rdparty/libjpeg/jdcoefct.c +++ b/3rdparty/libjpeg/jdcoefct.c @@ -2,7 +2,7 @@ * jdcoefct.c * * Copyright (C) 1994-1997, Thomas G. Lane. - * Modified 2002-2011 by Guido Vollbeding. + * Modified 2002-2020 by Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -19,11 +19,13 @@ #include "jinclude.h" #include "jpeglib.h" + /* Block smoothing is only applicable for progressive JPEG, so: */ #ifndef D_PROGRESSIVE_SUPPORTED #undef BLOCK_SMOOTHING_SUPPORTED #endif + /* Private buffer controller object */ typedef struct { @@ -38,11 +40,8 @@ typedef struct { /* The output side's location is represented by cinfo->output_iMCU_row. */ /* In single-pass modes, it's sufficient to buffer just one MCU. - * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, + * We append a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, * and let the entropy decoder write into that workspace each time. - * (On 80x86, the workspace is FAR even though it's not really very big; - * this is to keep the module interfaces unchanged when a large coefficient - * buffer is necessary.) * In multi-pass modes, this array points to the current MCU's blocks * within the virtual arrays; it is used only by the input side. */ @@ -58,10 +57,14 @@ typedef struct { int * coef_bits_latch; #define SAVED_COEFS 6 /* we save coef_bits[0..5] */ #endif + + /* Workspace for single-pass modes (omitted otherwise). */ + JBLOCK blk_buffer[D_MAX_BLOCKS_IN_MCU]; } my_coef_controller; typedef my_coef_controller * my_coef_ptr; + /* Forward declarations */ METHODDEF(int) decompress_onepass JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); @@ -151,7 +154,8 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) JDIMENSION MCU_col_num; /* index of current MCU within row */ JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; - int blkn, ci, xindex, yindex, yoffset, useful_width; + int ci, xindex, yindex, yoffset, useful_width; + JBLOCKROW blkp; JSAMPARRAY output_ptr; JDIMENSION start_col, output_col; jpeg_component_info *compptr; @@ -162,10 +166,10 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) yoffset++) { for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col; MCU_col_num++) { + blkp = coef->blk_buffer; /* pointer to current DCT block within MCU */ /* Try to fetch an MCU. Entropy decoder expects buffer to be zeroed. */ if (cinfo->lim_Se) /* can bypass in DC only case */ - FMEMZERO((void FAR *) coef->MCU_buffer[0], - (size_t) (cinfo->blocks_in_MCU * SIZEOF(JBLOCK))); + MEMZERO(blkp, cinfo->blocks_in_MCU * SIZEOF(JBLOCK)); if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { /* Suspension forced; update state counters and exit */ coef->MCU_vert_offset = yoffset; @@ -173,37 +177,34 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) return JPEG_SUSPENDED; } /* Determine where data should go in output_buf and do the IDCT thing. - * We skip dummy blocks at the right and bottom edges (but blkn gets - * incremented past them!). Note the inner loop relies on having - * allocated the MCU_buffer[] blocks sequentially. + * We skip dummy blocks at the right and bottom edges (but blkp gets + * incremented past them!). */ - blkn = 0; /* index of current DCT block within MCU */ for (ci = 0; ci < cinfo->comps_in_scan; ci++) { compptr = cinfo->cur_comp_info[ci]; /* Don't bother to IDCT an uninteresting component. */ if (! compptr->component_needed) { - blkn += compptr->MCU_blocks; + blkp += compptr->MCU_blocks; continue; } inverse_DCT = cinfo->idct->inverse_DCT[compptr->component_index]; - useful_width = (MCU_col_num < last_MCU_col) ? compptr->MCU_width - : compptr->last_col_width; output_ptr = output_buf[compptr->component_index] + yoffset * compptr->DCT_v_scaled_size; + useful_width = (MCU_col_num < last_MCU_col) ? compptr->MCU_width + : compptr->last_col_width; start_col = MCU_col_num * compptr->MCU_sample_width; for (yindex = 0; yindex < compptr->MCU_height; yindex++) { if (cinfo->input_iMCU_row < last_iMCU_row || - yoffset+yindex < compptr->last_row_height) { + yoffset + yindex < compptr->last_row_height) { output_col = start_col; for (xindex = 0; xindex < useful_width; xindex++) { - (*inverse_DCT) (cinfo, compptr, - (JCOEFPTR) coef->MCU_buffer[blkn+xindex], + (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) (blkp + xindex), output_ptr, output_col); output_col += compptr->DCT_h_scaled_size; } + output_ptr += compptr->DCT_v_scaled_size; } - blkn += compptr->MCU_width; - output_ptr += compptr->DCT_v_scaled_size; + blkp += compptr->MCU_width; } } } @@ -212,7 +213,7 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) } /* Completed the iMCU row, advance counters for next one */ cinfo->output_iMCU_row++; - if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { + if (++(cinfo->input_iMCU_row) <= last_iMCU_row) { start_iMCU_row(cinfo); return JPEG_ROW_COMPLETED; } @@ -247,8 +248,9 @@ consume_data (j_decompress_ptr cinfo) { my_coef_ptr coef = (my_coef_ptr) cinfo->coef; JDIMENSION MCU_col_num; /* index of current MCU within row */ - int blkn, ci, xindex, yindex, yoffset; + int ci, xindex, yindex, yoffset; JDIMENSION start_col; + JBLOCKARRAY blkp; JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; JBLOCKROW buffer_ptr; jpeg_component_info *compptr; @@ -272,15 +274,16 @@ consume_data (j_decompress_ptr cinfo) for (MCU_col_num = coef->MCU_ctr; MCU_col_num < cinfo->MCUs_per_row; MCU_col_num++) { /* Construct list of pointers to DCT blocks belonging to this MCU */ - blkn = 0; /* index of current DCT block within MCU */ + blkp = coef->MCU_buffer; /* pointer to current DCT block within MCU */ for (ci = 0; ci < cinfo->comps_in_scan; ci++) { compptr = cinfo->cur_comp_info[ci]; start_col = MCU_col_num * compptr->MCU_width; for (yindex = 0; yindex < compptr->MCU_height; yindex++) { - buffer_ptr = buffer[ci][yindex+yoffset] + start_col; - for (xindex = 0; xindex < compptr->MCU_width; xindex++) { - coef->MCU_buffer[blkn++] = buffer_ptr++; - } + buffer_ptr = buffer[ci][yoffset + yindex] + start_col; + xindex = compptr->MCU_width; + do { + *blkp++ = buffer_ptr++; + } while (--xindex); } } /* Try to fetch the MCU. */ @@ -370,7 +373,7 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) } } - if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) + if (++(cinfo->output_iMCU_row) <= last_iMCU_row) return JPEG_ROW_COMPLETED; return JPEG_SCAN_COMPLETED; } @@ -419,10 +422,9 @@ smoothing_ok (j_decompress_ptr cinfo) /* Allocate latch area if not already done */ if (coef->coef_bits_latch == NULL) - coef->coef_bits_latch = (int *) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - cinfo->num_components * - (SAVED_COEFS * SIZEOF(int))); + coef->coef_bits_latch = (int *) (*cinfo->mem->alloc_small) + ((j_common_ptr) cinfo, JPOOL_IMAGE, + cinfo->num_components * (SAVED_COEFS * SIZEOF(int))); coef_bits_latch = coef->coef_bits_latch; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; @@ -662,7 +664,7 @@ decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) } } - if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) + if (++(cinfo->output_iMCU_row) <= last_iMCU_row) return JPEG_ROW_COMPLETED; return JPEG_SCAN_COMPLETED; } @@ -679,17 +681,6 @@ jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) { my_coef_ptr coef; - coef = (my_coef_ptr) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF(my_coef_controller)); - cinfo->coef = (struct jpeg_d_coef_controller *) coef; - coef->pub.start_input_pass = start_input_pass; - coef->pub.start_output_pass = start_output_pass; -#ifdef BLOCK_SMOOTHING_SUPPORTED - coef->coef_bits_latch = NULL; -#endif - - /* Create the coefficient buffer. */ if (need_full_buffer) { #ifdef D_MULTISCAN_FILES_SUPPORTED /* Allocate a full-image virtual array for each component, */ @@ -698,6 +689,9 @@ jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) int ci, access_rows; jpeg_component_info *compptr; + coef = (my_coef_ptr) (*cinfo->mem->alloc_small) + ((j_common_ptr) cinfo, JPOOL_IMAGE, + SIZEOF(my_coef_controller) - SIZEOF(coef->blk_buffer)); for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { access_rows = compptr->v_samp_factor; @@ -722,20 +716,29 @@ jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) #endif } else { /* We only need a single-MCU buffer. */ - JBLOCKROW buffer; - int i; - - buffer = (JBLOCKROW) - (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, - D_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); - for (i = 0; i < D_MAX_BLOCKS_IN_MCU; i++) { - coef->MCU_buffer[i] = buffer + i; - } + JBLOCKARRAY blkp; + JBLOCKROW buffer_ptr; + int bi; + + coef = (my_coef_ptr) (*cinfo->mem->alloc_small) + ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_coef_controller)); + buffer_ptr = coef->blk_buffer; if (cinfo->lim_Se == 0) /* DC only case: want to bypass later */ - FMEMZERO((void FAR *) buffer, - (size_t) (D_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK))); + MEMZERO(buffer_ptr, SIZEOF(coef->blk_buffer)); + blkp = coef->MCU_buffer; + bi = D_MAX_BLOCKS_IN_MCU; + do { + *blkp++ = buffer_ptr++; + } while (--bi); coef->pub.consume_data = dummy_consume_data; coef->pub.decompress_data = decompress_onepass; coef->pub.coef_arrays = NULL; /* flag for no virtual arrays */ } + + coef->pub.start_input_pass = start_input_pass; + coef->pub.start_output_pass = start_output_pass; +#ifdef BLOCK_SMOOTHING_SUPPORTED + coef->coef_bits_latch = NULL; +#endif + cinfo->coef = &coef->pub; } |