diff options
Diffstat (limited to 'jpeg/jdmaster.c')
| -rw-r--r-- | jpeg/jdmaster.c | 47 |
1 files changed, 24 insertions, 23 deletions
diff --git a/jpeg/jdmaster.c b/jpeg/jdmaster.c index 62c07671..c309f762 100644 --- a/jpeg/jdmaster.c +++ b/jpeg/jdmaster.c @@ -2,7 +2,7 @@ * jdmaster.c * * Copyright (C) 1991-1997, Thomas G. Lane. - * Modified 2002-2017 by Guido Vollbeding. + * Modified 2002-2019 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. * @@ -104,7 +104,7 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo) */ { #ifdef IDCT_SCALING_SUPPORTED - int ci; + int ci, ssize; jpeg_component_info *compptr; #endif @@ -124,19 +124,23 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo) */ for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { - int ssize = 1; - while (cinfo->min_DCT_h_scaled_size * ssize <= - (cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) && - (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) { - ssize = ssize * 2; - } + ssize = 1; + if (! cinfo->raw_data_out) + while (cinfo->min_DCT_h_scaled_size * ssize <= + (cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) && + (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == + 0) { + ssize = ssize * 2; + } compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize; ssize = 1; - while (cinfo->min_DCT_v_scaled_size * ssize <= - (cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) && - (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) { - ssize = ssize * 2; - } + if (! cinfo->raw_data_out) + while (cinfo->min_DCT_v_scaled_size * ssize <= + (cinfo->do_fancy_upsampling ? DCTSIZE : DCTSIZE / 2) && + (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == + 0) { + ssize = ssize * 2; + } compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize; /* We don't support IDCT ratios larger than 2. */ @@ -144,13 +148,10 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo) compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2; else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2) compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2; - } - /* Recompute downsampled dimensions of components; - * application needs to know these if using raw downsampled data. - */ - for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; - ci++, compptr++) { + /* Recompute downsampled dimensions of components; + * application needs to know these if using raw downsampled data. + */ /* Size in samples, after IDCT scaling */ compptr->downsampled_width = (JDIMENSION) jdiv_round_up((long) cinfo->image_width * @@ -172,8 +173,10 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo) break; case JCS_RGB: case JCS_BG_RGB: +#if RGB_PIXELSIZE != 3 cinfo->out_color_components = RGB_PIXELSIZE; break; +#endif /* else share code with YCbCr */ case JCS_YCbCr: case JCS_BG_YCC: cinfo->out_color_components = 3; @@ -184,7 +187,6 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo) break; default: /* else must be same colorspace as in file */ cinfo->out_color_components = cinfo->num_components; - break; } cinfo->output_components = (cinfo->quantize_colors ? 1 : cinfo->out_color_components); @@ -525,9 +527,8 @@ jinit_master_decompress (j_decompress_ptr cinfo) { my_master_ptr master; - master = (my_master_ptr) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF(my_decomp_master)); + master = (my_master_ptr) (*cinfo->mem->alloc_small) + ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_decomp_master)); cinfo->master = &master->pub; master->pub.prepare_for_output_pass = prepare_for_output_pass; master->pub.finish_output_pass = finish_output_pass; |