diff options
Diffstat (limited to 'jpeg/jcdctmgr.c')
| -rw-r--r-- | jpeg/jcdctmgr.c | 29 |
1 files changed, 9 insertions, 20 deletions
diff --git a/jpeg/jcdctmgr.c b/jpeg/jcdctmgr.c index fafab91c..a48ccd81 100644 --- a/jpeg/jcdctmgr.c +++ b/jpeg/jcdctmgr.c @@ -2,7 +2,7 @@ * jcdctmgr.c * * Copyright (C) 1994-1996, Thomas G. Lane. - * Modified 2003-2013 by Guido Vollbeding. + * Modified 2003-2020 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. * @@ -66,15 +66,14 @@ typedef union { * Perform forward DCT on one or more blocks of a component. * * The input samples are taken from the sample_data[] array starting at - * position start_row/start_col, and moving to the right for any additional - * blocks. The quantized coefficients are returned in coef_blocks[]. + * position start_col, and moving to the right for any additional blocks. + * The quantized coefficients are returned in coef_blocks[]. */ METHODDEF(void) forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr, JSAMPARRAY sample_data, JBLOCKROW coef_blocks, - JDIMENSION start_row, JDIMENSION start_col, - JDIMENSION num_blocks) + JDIMENSION start_col, JDIMENSION num_blocks) /* This version is used for integer DCT implementations. */ { /* This routine is heavily used, so it's worth coding it tightly. */ @@ -84,8 +83,6 @@ forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr, DCTELEM workspace[DCTSIZE2]; /* work area for FDCT subroutine */ JDIMENSION bi; - sample_data += start_row; /* fold in the vertical offset once */ - for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) { /* Perform the DCT */ (*do_dct) (workspace, sample_data, start_col); @@ -136,8 +133,7 @@ forward_DCT (j_compress_ptr cinfo, jpeg_component_info * compptr, METHODDEF(void) forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr, JSAMPARRAY sample_data, JBLOCKROW coef_blocks, - JDIMENSION start_row, JDIMENSION start_col, - JDIMENSION num_blocks) + JDIMENSION start_col, JDIMENSION num_blocks) /* This version is used for floating-point DCT implementations. */ { /* This routine is heavily used, so it's worth coding it tightly. */ @@ -147,8 +143,6 @@ forward_DCT_float (j_compress_ptr cinfo, jpeg_component_info * compptr, FAST_FLOAT workspace[DCTSIZE2]; /* work area for FDCT subroutine */ JDIMENSION bi; - sample_data += start_row; /* fold in the vertical offset once */ - for (bi = 0; bi < num_blocks; bi++, start_col += compptr->DCT_h_scaled_size) { /* Perform the DCT */ (*do_dct) (workspace, sample_data, start_col); @@ -347,13 +341,11 @@ start_pass_fdctmgr (j_compress_ptr cinfo) #endif default: ERREXIT(cinfo, JERR_NOT_COMPILED); - break; } break; default: ERREXIT2(cinfo, JERR_BAD_DCTSIZE, compptr->DCT_h_scaled_size, compptr->DCT_v_scaled_size); - break; } qtblno = compptr->quant_tbl_no; /* Make sure specified quantization table is present */ @@ -444,7 +436,6 @@ start_pass_fdctmgr (j_compress_ptr cinfo) #endif default: ERREXIT(cinfo, JERR_NOT_COMPILED); - break; } } } @@ -461,17 +452,15 @@ jinit_forward_dct (j_compress_ptr cinfo) int ci; jpeg_component_info *compptr; - fdct = (my_fdct_ptr) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF(my_fdct_controller)); + fdct = (my_fdct_ptr) (*cinfo->mem->alloc_small) + ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_fdct_controller)); cinfo->fdct = &fdct->pub; fdct->pub.start_pass = start_pass_fdctmgr; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { /* Allocate a divisor table for each component */ - compptr->dct_table = - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF(divisor_table)); + compptr->dct_table = (*cinfo->mem->alloc_small) + ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(divisor_table)); } } |