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| typedef struct { |
| struct jpeg_d_coef_controller pub; |
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| JDIMENSION MCU_ctr; |
| int MCU_vert_offset; |
| int MCU_rows_per_iMCU_row; |
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| JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; |
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| jvirt_barray_ptr whole_image[MAX_COMPONENTS]; |
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| int * coef_bits_latch; |
| |
| |
| } my_coef_controller; |
| |
| typedef my_coef_controller * my_coef_ptr; |
| |
| |
| METHODDEF(int) decompress_onepass |
| JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); |
| |
| METHODDEF(int) decompress_data |
| JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); |
| |
| |
| LOCAL(boolean) smoothing_ok JPP((j_decompress_ptr cinfo)); |
| METHODDEF(int) decompress_smooth_data |
| JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); |
| |
| |
| |
| LOCAL(void) |
| start_iMCU_row (j_decompress_ptr cinfo) |
| |
| { |
| my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
| |
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| if (cinfo->comps_in_scan > 1) { |
| coef->MCU_rows_per_iMCU_row = 1; |
| } else { |
| if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1)) |
| coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; |
| else |
| coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; |
| } |
| |
| coef->MCU_ctr = 0; |
| coef->MCU_vert_offset = 0; |
| } |
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| METHODDEF(void) |
| start_input_pass (j_decompress_ptr cinfo) |
| { |
| cinfo->input_iMCU_row = 0; |
| start_iMCU_row(cinfo); |
| } |
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| METHODDEF(void) |
| start_output_pass (j_decompress_ptr cinfo) |
| { |
| |
| my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
| |
| |
| if (coef->pub.coef_arrays != NULL) { |
| if (cinfo->do_block_smoothing && smoothing_ok(cinfo)) |
| coef->pub.decompress_data = decompress_smooth_data; |
| else |
| coef->pub.decompress_data = decompress_data; |
| } |
| |
| cinfo->output_iMCU_row = 0; |
| } |
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| METHODDEF(int) |
| decompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) |
| { |
| my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
| JDIMENSION MCU_col_num; |
| 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; |
| JSAMPARRAY output_ptr; |
| JDIMENSION start_col, output_col; |
| jpeg_component_info *compptr; |
| inverse_DCT_method_ptr inverse_DCT; |
| |
| |
| for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; |
| yoffset++) { |
| for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col; |
| MCU_col_num++) { |
| |
| if (cinfo->lim_Se) |
| FMEMZERO((void FAR *) coef->MCU_buffer[0], |
| (size_t) (cinfo->blocks_in_MCU * SIZEOF(JBLOCK))); |
| if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { |
| |
| coef->MCU_vert_offset = yoffset; |
| coef->MCU_ctr = MCU_col_num; |
| return JPEG_SUSPENDED; |
| } |
| |
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| |
| |
| blkn = 0; |
| for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
| compptr = cinfo->cur_comp_info[ci]; |
| |
| 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; |
| output_ptr = output_buf[compptr->component_index] + |
| yoffset * compptr->DCT_v_scaled_size; |
| 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) { |
| output_col = start_col; |
| for (xindex = 0; xindex < useful_width; xindex++) { |
| (*inverse_DCT) (cinfo, compptr, |
| (JCOEFPTR) coef->MCU_buffer[blkn+xindex], |
| output_ptr, output_col); |
| output_col += compptr->DCT_h_scaled_size; |
| } |
| } |
| blkn += compptr->MCU_width; |
| output_ptr += compptr->DCT_v_scaled_size; |
| } |
| } |
| } |
| |
| coef->MCU_ctr = 0; |
| } |
| |
| cinfo->output_iMCU_row++; |
| if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { |
| start_iMCU_row(cinfo); |
| return JPEG_ROW_COMPLETED; |
| } |
| |
| (*cinfo->inputctl->finish_input_pass) (cinfo); |
| return JPEG_SCAN_COMPLETED; |
| } |
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| METHODDEF(int) |
| dummy_consume_data (j_decompress_ptr cinfo) |
| { |
| return JPEG_SUSPENDED; |
| } |
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| METHODDEF(int) |
| consume_data (j_decompress_ptr cinfo) |
| { |
| my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
| JDIMENSION MCU_col_num; |
| int blkn, ci, xindex, yindex, yoffset; |
| JDIMENSION start_col; |
| JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; |
| JBLOCKROW buffer_ptr; |
| jpeg_component_info *compptr; |
| |
| |
| 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], |
| cinfo->input_iMCU_row * compptr->v_samp_factor, |
| (JDIMENSION) compptr->v_samp_factor, TRUE); |
| |
| |
| |
| |
| } |
| |
| |
| for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; |
| yoffset++) { |
| for (MCU_col_num = coef->MCU_ctr; MCU_col_num < cinfo->MCUs_per_row; |
| MCU_col_num++) { |
| |
| blkn = 0; |
| 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++; |
| } |
| } |
| } |
| |
| if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { |
| |
| coef->MCU_vert_offset = yoffset; |
| coef->MCU_ctr = MCU_col_num; |
| return JPEG_SUSPENDED; |
| } |
| } |
| |
| coef->MCU_ctr = 0; |
| } |
| |
| if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { |
| start_iMCU_row(cinfo); |
| return JPEG_ROW_COMPLETED; |
| } |
| |
| (*cinfo->inputctl->finish_input_pass) (cinfo); |
| return JPEG_SCAN_COMPLETED; |
| } |
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| METHODDEF(int) |
| decompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) |
| { |
| 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; |
| JBLOCKARRAY buffer; |
| JBLOCKROW buffer_ptr; |
| JSAMPARRAY output_ptr; |
| JDIMENSION output_col; |
| jpeg_component_info *compptr; |
| inverse_DCT_method_ptr inverse_DCT; |
| |
| |
| 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) |
| return JPEG_SUSPENDED; |
| } |
| |
| |
| for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| ci++, compptr++) { |
| |
| if (! compptr->component_needed) |
| continue; |
| |
| buffer = (*cinfo->mem->access_virt_barray) |
| ((j_common_ptr) cinfo, coef->whole_image[ci], |
| cinfo->output_iMCU_row * compptr->v_samp_factor, |
| (JDIMENSION) compptr->v_samp_factor, FALSE); |
| |
| if (cinfo->output_iMCU_row < last_iMCU_row) |
| block_rows = compptr->v_samp_factor; |
| else { |
| |
| 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]; |
| output_ptr = output_buf[ci]; |
| |
| for (block_row = 0; block_row < block_rows; block_row++) { |
| buffer_ptr = buffer[block_row]; |
| output_col = 0; |
| for (block_num = 0; block_num < compptr->width_in_blocks; block_num++) { |
| (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) buffer_ptr, |
| output_ptr, output_col); |
| buffer_ptr++; |
| output_col += compptr->DCT_h_scaled_size; |
| } |
| output_ptr += compptr->DCT_v_scaled_size; |
| } |
| } |
| |
| if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) |
| return JPEG_ROW_COMPLETED; |
| return JPEG_SCAN_COMPLETED; |
| } |
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| LOCAL(boolean) |
| smoothing_ok (j_decompress_ptr cinfo) |
| { |
| 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; |
| |
| if (! cinfo->progressive_mode || cinfo->coef_bits == NULL) |
| return FALSE; |
| |
| |
| 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_bits_latch = coef->coef_bits_latch; |
| |
| for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| ci++, compptr++) { |
| |
| if ((qtable = compptr->quant_table) == NULL) |
| return FALSE; |
| |
| 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) |
| return FALSE; |
| |
| coef_bits = cinfo->coef_bits[ci]; |
| if (coef_bits[0] < 0) |
| return FALSE; |
| |
| for (coefi = 1; coefi <= 5; coefi++) { |
| coef_bits_latch[coefi] = coef_bits[coefi]; |
| if (coef_bits[coefi] != 0) |
| smoothing_useful = TRUE; |
| } |
| coef_bits_latch += SAVED_COEFS; |
| } |
| |
| return smoothing_useful; |
| } |
| |
| |
| |
| |
| |
| |
| METHODDEF(int) |
| decompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) |
| { |
| 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; |
| JSAMPARRAY output_ptr; |
| JDIMENSION output_col; |
| jpeg_component_info *compptr; |
| inverse_DCT_method_ptr inverse_DCT; |
| boolean first_row, last_row; |
| JBLOCK workspace; |
| int *coef_bits; |
| JQUANT_TBL *quanttbl; |
| INT32 Q00,Q01,Q02,Q10,Q11,Q20, num; |
| int DC1,DC2,DC3,DC4,DC5,DC6,DC7,DC8,DC9; |
| int Al, pred; |
| |
| |
| while (cinfo->input_scan_number <= cinfo->output_scan_number && |
| ! cinfo->inputctl->eoi_reached) { |
| if (cinfo->input_scan_number == cinfo->output_scan_number) { |
| |
| |
| |
| |
| |
| JDIMENSION delta = (cinfo->Ss == 0) ? 1 : 0; |
| if (cinfo->input_iMCU_row > cinfo->output_iMCU_row+delta) |
| break; |
| } |
| if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED) |
| return JPEG_SUSPENDED; |
| } |
| |
| |
| for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| ci++, compptr++) { |
| |
| if (! compptr->component_needed) |
| continue; |
| |
| if (cinfo->output_iMCU_row < last_iMCU_row) { |
| block_rows = compptr->v_samp_factor; |
| access_rows = block_rows * 2; |
| last_row = FALSE; |
| } else { |
| |
| 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; |
| last_row = TRUE; |
| } |
| |
| if (cinfo->output_iMCU_row > 0) { |
| access_rows += compptr->v_samp_factor; |
| buffer = (*cinfo->mem->access_virt_barray) |
| ((j_common_ptr) cinfo, coef->whole_image[ci], |
| (cinfo->output_iMCU_row - 1) * compptr->v_samp_factor, |
| (JDIMENSION) access_rows, FALSE); |
| buffer += compptr->v_samp_factor; |
| 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; |
| } |
| |
| coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS); |
| quanttbl = compptr->quant_table; |
| Q00 = quanttbl->quantval[0]; |
| Q01 = quanttbl->quantval[Q01_POS]; |
| Q10 = quanttbl->quantval[Q10_POS]; |
| Q20 = quanttbl->quantval[Q20_POS]; |
| Q11 = quanttbl->quantval[Q11_POS]; |
| Q02 = quanttbl->quantval[Q02_POS]; |
| inverse_DCT = cinfo->idct->inverse_DCT[ci]; |
| output_ptr = output_buf[ci]; |
| |
| for (block_row = 0; block_row < block_rows; block_row++) { |
| buffer_ptr = buffer[block_row]; |
| if (first_row && block_row == 0) |
| prev_block_row = buffer_ptr; |
| else |
| prev_block_row = buffer[block_row-1]; |
| if (last_row && block_row == block_rows-1) |
| next_block_row = buffer_ptr; |
| else |
| next_block_row = buffer[block_row+1]; |
| |
| |
| |
| 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]; |
| output_col = 0; |
| last_block_column = compptr->width_in_blocks - 1; |
| for (block_num = 0; block_num <= last_block_column; block_num++) { |
| |
| jcopy_block_row(buffer_ptr, (JBLOCKROW) workspace, (JDIMENSION) 1); |
| |
| 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 ((Al=coef_bits[1]) != 0 && workspace[1] == 0) { |
| num = 36 * Q00 * (DC4 - DC6); |
| if (num >= 0) { |
| 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 = -pred; |
| } |
| workspace[1] = (JCOEF) pred; |
| } |
| |
| if ((Al=coef_bits[2]) != 0 && workspace[8] == 0) { |
| num = 36 * Q00 * (DC2 - DC8); |
| if (num >= 0) { |
| 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 = -pred; |
| } |
| workspace[8] = (JCOEF) pred; |
| } |
| |
| if ((Al=coef_bits[3]) != 0 && workspace[16] == 0) { |
| num = 9 * Q00 * (DC2 + DC8 - 2*DC5); |
| if (num >= 0) { |
| 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 = -pred; |
| } |
| workspace[16] = (JCOEF) pred; |
| } |
| |
| if ((Al=coef_bits[4]) != 0 && workspace[9] == 0) { |
| num = 5 * Q00 * (DC1 - DC3 - DC7 + DC9); |
| if (num >= 0) { |
| 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 = -pred; |
| } |
| workspace[9] = (JCOEF) pred; |
| } |
| |
| if ((Al=coef_bits[5]) != 0 && workspace[2] == 0) { |
| num = 9 * Q00 * (DC4 + DC6 - 2*DC5); |
| if (num >= 0) { |
| 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 = -pred; |
| } |
| workspace[2] = (JCOEF) pred; |
| } |
| |
| (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) workspace, |
| output_ptr, output_col); |
| |
| DC1 = DC2; DC2 = DC3; |
| DC4 = DC5; DC5 = DC6; |
| DC7 = DC8; DC8 = DC9; |
| buffer_ptr++, prev_block_row++, next_block_row++; |
| output_col += compptr->DCT_h_scaled_size; |
| } |
| output_ptr += compptr->DCT_v_scaled_size; |
| } |
| } |
| |
| if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) |
| return JPEG_ROW_COMPLETED; |
| return JPEG_SCAN_COMPLETED; |
| } |
| |
| |
| |
| |
| |
| |
| |
| |
| GLOBAL(void) |
| 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; |
| |
| coef->coef_bits_latch = NULL; |
| |
| |
| |
| if (need_full_buffer) { |
| |
| |
| |
| |
| int ci, access_rows; |
| jpeg_component_info *compptr; |
| |
| for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| ci++, compptr++) { |
| access_rows = compptr->v_samp_factor; |
| |
| |
| if (cinfo->progressive_mode) |
| access_rows *= 3; |
| |
| 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); |
| } |
| coef->pub.consume_data = consume_data; |
| coef->pub.decompress_data = decompress_data; |
| coef->pub.coef_arrays = coef->whole_image; |
| |
| ERREXIT(cinfo, JERR_NOT_COMPILED); |
| |
| } else { |
| |
| 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; |
| } |
| if (cinfo->lim_Se == 0) |
| FMEMZERO((void FAR *) buffer, |
| (size_t) (D_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK))); |
| coef->pub.consume_data = dummy_consume_data; |
| coef->pub.decompress_data = decompress_onepass; |
| coef->pub.coef_arrays = NULL; |
| } |
| } |