diff options
Diffstat (limited to 'media/libjpeg/jdcoefct.c')
| -rw-r--r-- | media/libjpeg/jdcoefct.c | 505 |
1 files changed, 345 insertions, 160 deletions
diff --git a/media/libjpeg/jdcoefct.c b/media/libjpeg/jdcoefct.c index 1a48969b83..15e6cded62 100644 --- a/media/libjpeg/jdcoefct.c +++ b/media/libjpeg/jdcoefct.c @@ -5,8 +5,8 @@ * Copyright (C) 1994-1997, Thomas G. Lane. * libjpeg-turbo Modifications: * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB - * Copyright (C) 2010, 2015-2016, D. R. Commander. - * Copyright (C) 2015, Google, Inc. + * Copyright (C) 2010, 2015-2016, 2019-2020, D. R. Commander. + * Copyright (C) 2015, 2020, Google, Inc. * For conditions of distribution and use, see the accompanying README.ijg * file. * @@ -25,16 +25,15 @@ /* Forward declarations */ -METHODDEF(int) decompress_onepass - (j_decompress_ptr cinfo, JSAMPIMAGE output_buf); +METHODDEF(int) decompress_onepass(j_decompress_ptr cinfo, + JSAMPIMAGE output_buf); #ifdef D_MULTISCAN_FILES_SUPPORTED -METHODDEF(int) decompress_data - (j_decompress_ptr cinfo, JSAMPIMAGE output_buf); +METHODDEF(int) decompress_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf); #endif #ifdef BLOCK_SMOOTHING_SUPPORTED -LOCAL(boolean) smoothing_ok (j_decompress_ptr cinfo); -METHODDEF(int) decompress_smooth_data - (j_decompress_ptr cinfo, JSAMPIMAGE output_buf); +LOCAL(boolean) smoothing_ok(j_decompress_ptr cinfo); +METHODDEF(int) decompress_smooth_data(j_decompress_ptr cinfo, + JSAMPIMAGE output_buf); #endif @@ -43,7 +42,7 @@ METHODDEF(int) decompress_smooth_data */ METHODDEF(void) -start_input_pass (j_decompress_ptr cinfo) +start_input_pass(j_decompress_ptr cinfo) { cinfo->input_iMCU_row = 0; start_iMCU_row(cinfo); @@ -55,10 +54,10 @@ start_input_pass (j_decompress_ptr cinfo) */ METHODDEF(void) -start_output_pass (j_decompress_ptr cinfo) +start_output_pass(j_decompress_ptr cinfo) { #ifdef BLOCK_SMOOTHING_SUPPORTED - my_coef_ptr coef = (my_coef_ptr) cinfo->coef; + my_coef_ptr coef = (my_coef_ptr)cinfo->coef; /* If multipass, check to see whether to use block smoothing on this pass */ if (coef->pub.coef_arrays != NULL) { @@ -83,9 +82,9 @@ start_output_pass (j_decompress_ptr cinfo) */ METHODDEF(int) -decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) +decompress_onepass(j_decompress_ptr cinfo, JSAMPIMAGE output_buf) { - my_coef_ptr coef = (my_coef_ptr) cinfo->coef; + my_coef_ptr coef = (my_coef_ptr)cinfo->coef; 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; @@ -101,9 +100,11 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col; MCU_col_num++) { /* Try to fetch an MCU. Entropy decoder expects buffer to be zeroed. */ - jzero_far((void *) coef->MCU_buffer[0], - (size_t) (cinfo->blocks_in_MCU * sizeof(JBLOCK))); - if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { + jzero_far((void *)coef->MCU_buffer[0], + (size_t)(cinfo->blocks_in_MCU * sizeof(JBLOCK))); + if (!cinfo->entropy->insufficient_data) + cinfo->master->last_good_iMCU_row = cinfo->input_iMCU_row; + if (!(*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { /* Suspension forced; update state counters and exit */ coef->MCU_vert_offset = yoffset; coef->MCU_ctr = MCU_col_num; @@ -120,28 +121,28 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) * incremented past them!). Note the inner loop relies on having * allocated the MCU_buffer[] blocks sequentially. */ - blkn = 0; /* index of current DCT block within MCU */ + 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) { + if (!compptr->component_needed) { blkn += 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; + 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_scaled_size; + yoffset * compptr->_DCT_scaled_size; start_col = (MCU_col_num - cinfo->master->first_iMCU_col) * - compptr->MCU_sample_width; + 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], + (JCOEFPTR)coef->MCU_buffer[blkn + xindex], output_ptr, output_col); output_col += compptr->_DCT_scaled_size; } @@ -172,7 +173,7 @@ decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) */ METHODDEF(int) -dummy_consume_data (j_decompress_ptr cinfo) +dummy_consume_data(j_decompress_ptr cinfo) { return JPEG_SUSPENDED; /* Always indicate nothing was done */ } @@ -188,9 +189,9 @@ dummy_consume_data (j_decompress_ptr cinfo) */ METHODDEF(int) -consume_data (j_decompress_ptr cinfo) +consume_data(j_decompress_ptr cinfo) { - my_coef_ptr coef = (my_coef_ptr) cinfo->coef; + 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; JDIMENSION start_col; @@ -202,9 +203,9 @@ consume_data (j_decompress_ptr cinfo) for (ci = 0; ci < cinfo->comps_in_scan; ci++) { compptr = cinfo->cur_comp_info[ci]; buffer[ci] = (*cinfo->mem->access_virt_barray) - ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], + ((j_common_ptr)cinfo, coef->whole_image[compptr->component_index], cinfo->input_iMCU_row * compptr->v_samp_factor, - (JDIMENSION) compptr->v_samp_factor, TRUE); + (JDIMENSION)compptr->v_samp_factor, TRUE); /* Note: entropy decoder expects buffer to be zeroed, * but this is handled automatically by the memory manager * because we requested a pre-zeroed array. @@ -222,14 +223,16 @@ consume_data (j_decompress_ptr cinfo) 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; + buffer_ptr = buffer[ci][yindex + yoffset] + start_col; for (xindex = 0; xindex < compptr->MCU_width; xindex++) { coef->MCU_buffer[blkn++] = buffer_ptr++; } } } + if (!cinfo->entropy->insufficient_data) + cinfo->master->last_good_iMCU_row = cinfo->input_iMCU_row; /* Try to fetch the MCU. */ - if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { + if (!(*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { /* Suspension forced; update state counters and exit */ coef->MCU_vert_offset = yoffset; coef->MCU_ctr = MCU_col_num; @@ -259,9 +262,9 @@ consume_data (j_decompress_ptr cinfo) */ METHODDEF(int) -decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) +decompress_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf) { - my_coef_ptr coef = (my_coef_ptr) cinfo->coef; + my_coef_ptr coef = (my_coef_ptr)cinfo->coef; JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; JDIMENSION block_num; int ci, block_row, block_rows; @@ -276,7 +279,7 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) while (cinfo->input_scan_number < cinfo->output_scan_number || (cinfo->input_scan_number == cinfo->output_scan_number && cinfo->input_iMCU_row <= cinfo->output_iMCU_row)) { - if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED) + if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) return JPEG_SUSPENDED; } @@ -284,19 +287,19 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { /* Don't bother to IDCT an uninteresting component. */ - if (! compptr->component_needed) + if (!compptr->component_needed) continue; /* Align the virtual buffer for this component. */ buffer = (*cinfo->mem->access_virt_barray) - ((j_common_ptr) cinfo, coef->whole_image[ci], + ((j_common_ptr)cinfo, coef->whole_image[ci], cinfo->output_iMCU_row * compptr->v_samp_factor, - (JDIMENSION) compptr->v_samp_factor, FALSE); + (JDIMENSION)compptr->v_samp_factor, FALSE); /* Count non-dummy DCT block rows in this iMCU row. */ if (cinfo->output_iMCU_row < last_iMCU_row) block_rows = compptr->v_samp_factor; else { /* NB: can't use last_row_height here; it is input-side-dependent! */ - block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); + block_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor); if (block_rows == 0) block_rows = compptr->v_samp_factor; } inverse_DCT = cinfo->idct->inverse_DCT[ci]; @@ -307,8 +310,8 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) output_col = 0; for (block_num = cinfo->master->first_MCU_col[ci]; block_num <= cinfo->master->last_MCU_col[ci]; block_num++) { - (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) buffer_ptr, - output_ptr, output_col); + (*inverse_DCT) (cinfo, compptr, (JCOEFPTR)buffer_ptr, output_ptr, + output_col); buffer_ptr++; output_col += compptr->_DCT_scaled_size; } @@ -327,19 +330,22 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) #ifdef BLOCK_SMOOTHING_SUPPORTED /* - * This code applies interblock smoothing as described by section K.8 - * of the JPEG standard: the first 5 AC coefficients are estimated from - * the DC values of a DCT block and its 8 neighboring blocks. + * This code applies interblock smoothing; the first 9 AC coefficients are + * estimated from the DC values of a DCT block and its 24 neighboring blocks. * We apply smoothing only for progressive JPEG decoding, and only if * the coefficients it can estimate are not yet known to full precision. */ -/* Natural-order array positions of the first 5 zigzag-order coefficients */ +/* Natural-order array positions of the first 9 zigzag-order coefficients */ #define Q01_POS 1 #define Q10_POS 8 #define Q20_POS 16 #define Q11_POS 9 #define Q02_POS 2 +#define Q03_POS 3 +#define Q12_POS 10 +#define Q21_POS 17 +#define Q30_POS 24 /* * Determine whether block smoothing is applicable and safe. @@ -350,51 +356,64 @@ decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) */ LOCAL(boolean) -smoothing_ok (j_decompress_ptr cinfo) +smoothing_ok(j_decompress_ptr cinfo) { - my_coef_ptr coef = (my_coef_ptr) cinfo->coef; + my_coef_ptr coef = (my_coef_ptr)cinfo->coef; boolean smoothing_useful = FALSE; int ci, coefi; jpeg_component_info *compptr; JQUANT_TBL *qtable; - int *coef_bits; - int *coef_bits_latch; + int *coef_bits, *prev_coef_bits; + int *coef_bits_latch, *prev_coef_bits_latch; - if (! cinfo->progressive_mode || cinfo->coef_bits == NULL) + if (!cinfo->progressive_mode || cinfo->coef_bits == NULL) return FALSE; /* 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 * + (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, + cinfo->num_components * 2 * (SAVED_COEFS * sizeof(int))); coef_bits_latch = coef->coef_bits_latch; + prev_coef_bits_latch = + &coef->coef_bits_latch[cinfo->num_components * SAVED_COEFS]; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { /* All components' quantization values must already be latched. */ if ((qtable = compptr->quant_table) == NULL) return FALSE; - /* Verify DC & first 5 AC quantizers are nonzero to avoid zero-divide. */ + /* Verify DC & first 9 AC quantizers are nonzero to avoid zero-divide. */ if (qtable->quantval[0] == 0 || qtable->quantval[Q01_POS] == 0 || qtable->quantval[Q10_POS] == 0 || qtable->quantval[Q20_POS] == 0 || qtable->quantval[Q11_POS] == 0 || - qtable->quantval[Q02_POS] == 0) + qtable->quantval[Q02_POS] == 0 || + qtable->quantval[Q03_POS] == 0 || + qtable->quantval[Q12_POS] == 0 || + qtable->quantval[Q21_POS] == 0 || + qtable->quantval[Q30_POS] == 0) return FALSE; /* DC values must be at least partly known for all components. */ coef_bits = cinfo->coef_bits[ci]; + prev_coef_bits = cinfo->coef_bits[ci + cinfo->num_components]; if (coef_bits[0] < 0) return FALSE; + coef_bits_latch[0] = coef_bits[0]; /* Block smoothing is helpful if some AC coefficients remain inaccurate. */ - for (coefi = 1; coefi <= 5; coefi++) { + for (coefi = 1; coefi < SAVED_COEFS; coefi++) { + if (cinfo->input_scan_number > 1) + prev_coef_bits_latch[coefi] = prev_coef_bits[coefi]; + else + prev_coef_bits_latch[coefi] = -1; coef_bits_latch[coefi] = coef_bits[coefi]; if (coef_bits[coefi] != 0) smoothing_useful = TRUE; } coef_bits_latch += SAVED_COEFS; + prev_coef_bits_latch += SAVED_COEFS; } return smoothing_useful; @@ -406,24 +425,27 @@ smoothing_ok (j_decompress_ptr cinfo) */ METHODDEF(int) -decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) +decompress_smooth_data(j_decompress_ptr cinfo, JSAMPIMAGE output_buf) { - my_coef_ptr coef = (my_coef_ptr) cinfo->coef; + my_coef_ptr coef = (my_coef_ptr)cinfo->coef; JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; JDIMENSION block_num, last_block_column; int ci, block_row, block_rows, access_rows; JBLOCKARRAY buffer; - JBLOCKROW buffer_ptr, prev_block_row, next_block_row; + JBLOCKROW buffer_ptr, prev_prev_block_row, prev_block_row; + JBLOCKROW next_block_row, next_next_block_row; JSAMPARRAY output_ptr; JDIMENSION output_col; jpeg_component_info *compptr; inverse_DCT_method_ptr inverse_DCT; - boolean first_row, last_row; + boolean change_dc; JCOEF *workspace; int *coef_bits; JQUANT_TBL *quanttbl; - JLONG Q00,Q01,Q02,Q10,Q11,Q20, num; - int DC1,DC2,DC3,DC4,DC5,DC6,DC7,DC8,DC9; + JLONG Q00, Q01, Q02, Q03 = 0, Q10, Q11, Q12 = 0, Q20, Q21 = 0, Q30 = 0, num; + int DC01, DC02, DC03, DC04, DC05, DC06, DC07, DC08, DC09, DC10, DC11, DC12, + DC13, DC14, DC15, DC16, DC17, DC18, DC19, DC20, DC21, DC22, DC23, DC24, + DC25; int Al, pred; /* Keep a local variable to avoid looking it up more than once */ @@ -431,18 +453,18 @@ decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) /* Force some input to be done if we are getting ahead of the input. */ while (cinfo->input_scan_number <= cinfo->output_scan_number && - ! cinfo->inputctl->eoi_reached) { + !cinfo->inputctl->eoi_reached) { if (cinfo->input_scan_number == cinfo->output_scan_number) { /* If input is working on current scan, we ordinarily want it to * have completed the current row. But if input scan is DC, - * we want it to keep one row ahead so that next block row's DC + * we want it to keep two rows ahead so that next two block rows' DC * values are up to date. */ - JDIMENSION delta = (cinfo->Ss == 0) ? 1 : 0; - if (cinfo->input_iMCU_row > cinfo->output_iMCU_row+delta) + JDIMENSION delta = (cinfo->Ss == 0) ? 2 : 0; + if (cinfo->input_iMCU_row > cinfo->output_iMCU_row + delta) break; } - if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED) + if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) return JPEG_SUSPENDED; } @@ -450,37 +472,56 @@ decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { /* Don't bother to IDCT an uninteresting component. */ - if (! compptr->component_needed) + if (!compptr->component_needed) continue; /* Count non-dummy DCT block rows in this iMCU row. */ - if (cinfo->output_iMCU_row < last_iMCU_row) { + if (cinfo->output_iMCU_row < last_iMCU_row - 1) { + block_rows = compptr->v_samp_factor; + access_rows = block_rows * 3; /* this and next two iMCU rows */ + } else if (cinfo->output_iMCU_row < last_iMCU_row) { block_rows = compptr->v_samp_factor; access_rows = block_rows * 2; /* this and next iMCU row */ - last_row = FALSE; } else { /* NB: can't use last_row_height here; it is input-side-dependent! */ - block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); + block_rows = (int)(compptr->height_in_blocks % compptr->v_samp_factor); if (block_rows == 0) block_rows = compptr->v_samp_factor; access_rows = block_rows; /* this iMCU row only */ - last_row = TRUE; } /* Align the virtual buffer for this component. */ - if (cinfo->output_iMCU_row > 0) { - access_rows += compptr->v_samp_factor; /* prior iMCU row too */ + if (cinfo->output_iMCU_row > 1) { + access_rows += 2 * compptr->v_samp_factor; /* prior two iMCU rows too */ + buffer = (*cinfo->mem->access_virt_barray) + ((j_common_ptr)cinfo, coef->whole_image[ci], + (cinfo->output_iMCU_row - 2) * compptr->v_samp_factor, + (JDIMENSION)access_rows, FALSE); + buffer += 2 * compptr->v_samp_factor; /* point to current iMCU row */ + } else if (cinfo->output_iMCU_row > 0) { buffer = (*cinfo->mem->access_virt_barray) - ((j_common_ptr) cinfo, coef->whole_image[ci], + ((j_common_ptr)cinfo, coef->whole_image[ci], (cinfo->output_iMCU_row - 1) * compptr->v_samp_factor, - (JDIMENSION) access_rows, FALSE); + (JDIMENSION)access_rows, FALSE); buffer += compptr->v_samp_factor; /* point to current iMCU row */ - first_row = FALSE; } else { buffer = (*cinfo->mem->access_virt_barray) - ((j_common_ptr) cinfo, coef->whole_image[ci], - (JDIMENSION) 0, (JDIMENSION) access_rows, FALSE); - first_row = TRUE; + ((j_common_ptr)cinfo, coef->whole_image[ci], + (JDIMENSION)0, (JDIMENSION)access_rows, FALSE); } - /* Fetch component-dependent info */ - coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS); + /* Fetch component-dependent info. + * If the current scan is incomplete, then we use the component-dependent + * info from the previous scan. + */ + if (cinfo->output_iMCU_row > cinfo->master->last_good_iMCU_row) + coef_bits = + coef->coef_bits_latch + ((ci + cinfo->num_components) * SAVED_COEFS); + else + coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS); + + /* We only do DC interpolation if no AC coefficient data is available. */ + change_dc = + coef_bits[1] == -1 && coef_bits[2] == -1 && coef_bits[3] == -1 && + coef_bits[4] == -1 && coef_bits[5] == -1 && coef_bits[6] == -1 && + coef_bits[7] == -1 && coef_bits[8] == -1 && coef_bits[9] == -1; + quanttbl = compptr->quant_table; Q00 = quanttbl->quantval[0]; Q01 = quanttbl->quantval[Q01_POS]; @@ -488,124 +529,268 @@ decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) Q20 = quanttbl->quantval[Q20_POS]; Q11 = quanttbl->quantval[Q11_POS]; Q02 = quanttbl->quantval[Q02_POS]; + if (change_dc) { + Q03 = quanttbl->quantval[Q03_POS]; + Q12 = quanttbl->quantval[Q12_POS]; + Q21 = quanttbl->quantval[Q21_POS]; + Q30 = quanttbl->quantval[Q30_POS]; + } inverse_DCT = cinfo->idct->inverse_DCT[ci]; output_ptr = output_buf[ci]; /* Loop over all DCT blocks to be processed. */ for (block_row = 0; block_row < block_rows; block_row++) { buffer_ptr = buffer[block_row] + cinfo->master->first_MCU_col[ci]; - if (first_row && block_row == 0) + + if (block_row > 0 || cinfo->output_iMCU_row > 0) + prev_block_row = + buffer[block_row - 1] + cinfo->master->first_MCU_col[ci]; + else prev_block_row = buffer_ptr; + + if (block_row > 1 || cinfo->output_iMCU_row > 1) + prev_prev_block_row = + buffer[block_row - 2] + cinfo->master->first_MCU_col[ci]; + else + prev_prev_block_row = prev_block_row; + + if (block_row < block_rows - 1 || cinfo->output_iMCU_row < last_iMCU_row) + next_block_row = + buffer[block_row + 1] + cinfo->master->first_MCU_col[ci]; else - prev_block_row = buffer[block_row-1]; - if (last_row && block_row == block_rows-1) next_block_row = buffer_ptr; + + if (block_row < block_rows - 2 || + cinfo->output_iMCU_row < last_iMCU_row - 1) + next_next_block_row = + buffer[block_row + 2] + cinfo->master->first_MCU_col[ci]; else - next_block_row = buffer[block_row+1]; + next_next_block_row = next_block_row; + /* We fetch the surrounding DC values using a sliding-register approach. - * Initialize all nine here so as to do the right thing on narrow pics. + * Initialize all 25 here so as to do the right thing on narrow pics. */ - DC1 = DC2 = DC3 = (int) prev_block_row[0][0]; - DC4 = DC5 = DC6 = (int) buffer_ptr[0][0]; - DC7 = DC8 = DC9 = (int) next_block_row[0][0]; + DC01 = DC02 = DC03 = DC04 = DC05 = (int)prev_prev_block_row[0][0]; + DC06 = DC07 = DC08 = DC09 = DC10 = (int)prev_block_row[0][0]; + DC11 = DC12 = DC13 = DC14 = DC15 = (int)buffer_ptr[0][0]; + DC16 = DC17 = DC18 = DC19 = DC20 = (int)next_block_row[0][0]; + DC21 = DC22 = DC23 = DC24 = DC25 = (int)next_next_block_row[0][0]; output_col = 0; last_block_column = compptr->width_in_blocks - 1; for (block_num = cinfo->master->first_MCU_col[ci]; block_num <= cinfo->master->last_MCU_col[ci]; block_num++) { /* Fetch current DCT block into workspace so we can modify it. */ - jcopy_block_row(buffer_ptr, (JBLOCKROW) workspace, (JDIMENSION) 1); + jcopy_block_row(buffer_ptr, (JBLOCKROW)workspace, (JDIMENSION)1); /* Update DC values */ - if (block_num < last_block_column) { - DC3 = (int) prev_block_row[1][0]; - DC6 = (int) buffer_ptr[1][0]; - DC9 = (int) next_block_row[1][0]; + if (block_num == cinfo->master->first_MCU_col[ci] && + block_num < last_block_column) { + DC04 = (int)prev_prev_block_row[1][0]; + DC09 = (int)prev_block_row[1][0]; + DC14 = (int)buffer_ptr[1][0]; + DC19 = (int)next_block_row[1][0]; + DC24 = (int)next_next_block_row[1][0]; + } + if (block_num + 1 < last_block_column) { + DC05 = (int)prev_prev_block_row[2][0]; + DC10 = (int)prev_block_row[2][0]; + DC15 = (int)buffer_ptr[2][0]; + DC20 = (int)next_block_row[2][0]; + DC25 = (int)next_next_block_row[2][0]; } - /* Compute coefficient estimates per K.8. - * An estimate is applied only if coefficient is still zero, - * and is not known to be fully accurate. + /* If DC interpolation is enabled, compute coefficient estimates using + * a Gaussian-like kernel, keeping the averages of the DC values. + * + * If DC interpolation is disabled, compute coefficient estimates using + * an algorithm similar to the one described in Section K.8 of the JPEG + * standard, except applied to a 5x5 window rather than a 3x3 window. + * + * An estimate is applied only if the coefficient is still zero and is + * not known to be fully accurate. */ /* AC01 */ - if ((Al=coef_bits[1]) != 0 && workspace[1] == 0) { - num = 36 * Q00 * (DC4 - DC6); + if ((Al = coef_bits[1]) != 0 && workspace[1] == 0) { + num = Q00 * (change_dc ? + (-DC01 - DC02 + DC04 + DC05 - 3 * DC06 + 13 * DC07 - + 13 * DC09 + 3 * DC10 - 3 * DC11 + 38 * DC12 - 38 * DC14 + + 3 * DC15 - 3 * DC16 + 13 * DC17 - 13 * DC19 + 3 * DC20 - + DC21 - DC22 + DC24 + DC25) : + (-7 * DC11 + 50 * DC12 - 50 * DC14 + 7 * DC15)); if (num >= 0) { - pred = (int) (((Q01<<7) + num) / (Q01<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q01 << 7) + num) / (Q01 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; } else { - pred = (int) (((Q01<<7) - num) / (Q01<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q01 << 7) - num) / (Q01 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; pred = -pred; } - workspace[1] = (JCOEF) pred; + workspace[1] = (JCOEF)pred; } /* AC10 */ - if ((Al=coef_bits[2]) != 0 && workspace[8] == 0) { - num = 36 * Q00 * (DC2 - DC8); + if ((Al = coef_bits[2]) != 0 && workspace[8] == 0) { + num = Q00 * (change_dc ? + (-DC01 - 3 * DC02 - 3 * DC03 - 3 * DC04 - DC05 - DC06 + + 13 * DC07 + 38 * DC08 + 13 * DC09 - DC10 + DC16 - + 13 * DC17 - 38 * DC18 - 13 * DC19 + DC20 + DC21 + + 3 * DC22 + 3 * DC23 + 3 * DC24 + DC25) : + (-7 * DC03 + 50 * DC08 - 50 * DC18 + 7 * DC23)); if (num >= 0) { - pred = (int) (((Q10<<7) + num) / (Q10<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q10 << 7) + num) / (Q10 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; } else { - pred = (int) (((Q10<<7) - num) / (Q10<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q10 << 7) - num) / (Q10 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; pred = -pred; } - workspace[8] = (JCOEF) pred; + workspace[8] = (JCOEF)pred; } /* AC20 */ - if ((Al=coef_bits[3]) != 0 && workspace[16] == 0) { - num = 9 * Q00 * (DC2 + DC8 - 2*DC5); + if ((Al = coef_bits[3]) != 0 && workspace[16] == 0) { + num = Q00 * (change_dc ? + (DC03 + 2 * DC07 + 7 * DC08 + 2 * DC09 - 5 * DC12 - 14 * DC13 - + 5 * DC14 + 2 * DC17 + 7 * DC18 + 2 * DC19 + DC23) : + (-DC03 + 13 * DC08 - 24 * DC13 + 13 * DC18 - DC23)); if (num >= 0) { - pred = (int) (((Q20<<7) + num) / (Q20<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q20 << 7) + num) / (Q20 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; } else { - pred = (int) (((Q20<<7) - num) / (Q20<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q20 << 7) - num) / (Q20 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; pred = -pred; } - workspace[16] = (JCOEF) pred; + workspace[16] = (JCOEF)pred; } /* AC11 */ - if ((Al=coef_bits[4]) != 0 && workspace[9] == 0) { - num = 5 * Q00 * (DC1 - DC3 - DC7 + DC9); + if ((Al = coef_bits[4]) != 0 && workspace[9] == 0) { + num = Q00 * (change_dc ? + (-DC01 + DC05 + 9 * DC07 - 9 * DC09 - 9 * DC17 + + 9 * DC19 + DC21 - DC25) : + (DC10 + DC16 - 10 * DC17 + 10 * DC19 - DC02 - DC20 + DC22 - + DC24 + DC04 - DC06 + 10 * DC07 - 10 * DC09)); if (num >= 0) { - pred = (int) (((Q11<<7) + num) / (Q11<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q11 << 7) + num) / (Q11 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; } else { - pred = (int) (((Q11<<7) - num) / (Q11<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q11 << 7) - num) / (Q11 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; pred = -pred; } - workspace[9] = (JCOEF) pred; + workspace[9] = (JCOEF)pred; } /* AC02 */ - if ((Al=coef_bits[5]) != 0 && workspace[2] == 0) { - num = 9 * Q00 * (DC4 + DC6 - 2*DC5); + if ((Al = coef_bits[5]) != 0 && workspace[2] == 0) { + num = Q00 * (change_dc ? + (2 * DC07 - 5 * DC08 + 2 * DC09 + DC11 + 7 * DC12 - 14 * DC13 + + 7 * DC14 + DC15 + 2 * DC17 - 5 * DC18 + 2 * DC19) : + (-DC11 + 13 * DC12 - 24 * DC13 + 13 * DC14 - DC15)); if (num >= 0) { - pred = (int) (((Q02<<7) + num) / (Q02<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q02 << 7) + num) / (Q02 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; } else { - pred = (int) (((Q02<<7) - num) / (Q02<<8)); - if (Al > 0 && pred >= (1<<Al)) - pred = (1<<Al)-1; + pred = (int)(((Q02 << 7) - num) / (Q02 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; pred = -pred; } - workspace[2] = (JCOEF) pred; + workspace[2] = (JCOEF)pred; } + if (change_dc) { + /* AC03 */ + if ((Al = coef_bits[6]) != 0 && workspace[3] == 0) { + num = Q00 * (DC07 - DC09 + 2 * DC12 - 2 * DC14 + DC17 - DC19); + if (num >= 0) { + pred = (int)(((Q03 << 7) + num) / (Q03 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + } else { + pred = (int)(((Q03 << 7) - num) / (Q03 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + pred = -pred; + } + workspace[3] = (JCOEF)pred; + } + /* AC12 */ + if ((Al = coef_bits[7]) != 0 && workspace[10] == 0) { + num = Q00 * (DC07 - 3 * DC08 + DC09 - DC17 + 3 * DC18 - DC19); + if (num >= 0) { + pred = (int)(((Q12 << 7) + num) / (Q12 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + } else { + pred = (int)(((Q12 << 7) - num) / (Q12 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + pred = -pred; + } + workspace[10] = (JCOEF)pred; + } + /* AC21 */ + if ((Al = coef_bits[8]) != 0 && workspace[17] == 0) { + num = Q00 * (DC07 - DC09 - 3 * DC12 + 3 * DC14 + DC17 - DC19); + if (num >= 0) { + pred = (int)(((Q21 << 7) + num) / (Q21 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + } else { + pred = (int)(((Q21 << 7) - num) / (Q21 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + pred = -pred; + } + workspace[17] = (JCOEF)pred; + } + /* AC30 */ + if ((Al = coef_bits[9]) != 0 && workspace[24] == 0) { + num = Q00 * (DC07 + 2 * DC08 + DC09 - DC17 - 2 * DC18 - DC19); + if (num >= 0) { + pred = (int)(((Q30 << 7) + num) / (Q30 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + } else { + pred = (int)(((Q30 << 7) - num) / (Q30 << 8)); + if (Al > 0 && pred >= (1 << Al)) + pred = (1 << Al) - 1; + pred = -pred; + } + workspace[24] = (JCOEF)pred; + } + /* coef_bits[0] is non-negative. Otherwise this function would not + * be called. + */ + num = Q00 * + (-2 * DC01 - 6 * DC02 - 8 * DC03 - 6 * DC04 - 2 * DC05 - + 6 * DC06 + 6 * DC07 + 42 * DC08 + 6 * DC09 - 6 * DC10 - + 8 * DC11 + 42 * DC12 + 152 * DC13 + 42 * DC14 - 8 * DC15 - + 6 * DC16 + 6 * DC17 + 42 * DC18 + 6 * DC19 - 6 * DC20 - + 2 * DC21 - 6 * DC22 - 8 * DC23 - 6 * DC24 - 2 * DC25); + if (num >= 0) { + pred = (int)(((Q00 << 7) + num) / (Q00 << 8)); + } else { + pred = (int)(((Q00 << 7) - num) / (Q00 << 8)); + pred = -pred; + } + workspace[0] = (JCOEF)pred; + } /* change_dc */ + /* OK, do the IDCT */ - (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) workspace, - output_ptr, output_col); + (*inverse_DCT) (cinfo, compptr, (JCOEFPTR)workspace, output_ptr, + output_col); /* Advance for next column */ - DC1 = DC2; DC2 = DC3; - DC4 = DC5; DC5 = DC6; - DC7 = DC8; DC8 = DC9; - buffer_ptr++, prev_block_row++, next_block_row++; + DC01 = DC02; DC02 = DC03; DC03 = DC04; DC04 = DC05; + DC06 = DC07; DC07 = DC08; DC08 = DC09; DC09 = DC10; + DC11 = DC12; DC12 = DC13; DC13 = DC14; DC14 = DC15; + DC16 = DC17; DC17 = DC18; DC18 = DC19; DC19 = DC20; + DC21 = DC22; DC22 = DC23; DC23 = DC24; DC24 = DC25; + buffer_ptr++, prev_block_row++, next_block_row++, + prev_prev_block_row++, next_next_block_row++; output_col += compptr->_DCT_scaled_size; } output_ptr += compptr->_DCT_scaled_size; @@ -625,14 +810,14 @@ decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) */ GLOBAL(void) -jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) +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, + (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, sizeof(my_coef_controller)); - cinfo->coef = (struct jpeg_d_coef_controller *) coef; + 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 @@ -654,15 +839,15 @@ jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) #ifdef BLOCK_SMOOTHING_SUPPORTED /* If block smoothing could be used, need a bigger window */ if (cinfo->progressive_mode) - access_rows *= 3; + access_rows *= 5; #endif coef->whole_image[ci] = (*cinfo->mem->request_virt_barray) - ((j_common_ptr) cinfo, JPOOL_IMAGE, TRUE, - (JDIMENSION) jround_up((long) compptr->width_in_blocks, - (long) compptr->h_samp_factor), - (JDIMENSION) jround_up((long) compptr->height_in_blocks, - (long) compptr->v_samp_factor), - (JDIMENSION) access_rows); + ((j_common_ptr)cinfo, JPOOL_IMAGE, TRUE, + (JDIMENSION)jround_up((long)compptr->width_in_blocks, + (long)compptr->h_samp_factor), + (JDIMENSION)jround_up((long)compptr->height_in_blocks, + (long)compptr->v_samp_factor), + (JDIMENSION)access_rows); } coef->pub.consume_data = consume_data; coef->pub.decompress_data = decompress_data; @@ -676,7 +861,7 @@ jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) int i; buffer = (JBLOCKROW) - (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, + (*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; @@ -688,6 +873,6 @@ jinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) /* Allocate the workspace buffer */ coef->workspace = (JCOEF *) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, + (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, sizeof(JCOEF) * DCTSIZE2); } |