diff options
Diffstat (limited to 'jpeg/jdapimin.c')
| -rw-r--r-- | jpeg/jdapimin.c | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/jpeg/jdapimin.c b/jpeg/jdapimin.c index a6e0dd9fb..785e52722 100644 --- a/jpeg/jdapimin.c +++ b/jpeg/jdapimin.c @@ -2,7 +2,7 @@ * jdapimin.c * * Copyright (C) 1994-1998, Thomas G. Lane. - * Modified 2009-2013 by Guido Vollbeding. + * Modified 2009-2020 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. * @@ -114,7 +114,7 @@ jpeg_abort_decompress (j_decompress_ptr cinfo) LOCAL(void) default_decompress_parms (j_decompress_ptr cinfo) { - int cid0, cid1, cid2; + int cid0, cid1, cid2, cid3; /* Guess the input colorspace, and set output colorspace accordingly. */ /* Note application may override our guesses. */ @@ -123,13 +123,16 @@ default_decompress_parms (j_decompress_ptr cinfo) cinfo->jpeg_color_space = JCS_GRAYSCALE; cinfo->out_color_space = JCS_GRAYSCALE; break; - + case 3: cid0 = cinfo->comp_info[0].component_id; cid1 = cinfo->comp_info[1].component_id; cid2 = cinfo->comp_info[2].component_id; - /* First try to guess from the component IDs */ + /* For robust detection of standard colorspaces + * regardless of the presence of special markers, + * check component IDs from SOF marker first. + */ if (cid0 == 0x01 && cid1 == 0x02 && cid2 == 0x03) cinfo->jpeg_color_space = JCS_YCbCr; else if (cid0 == 0x01 && cid1 == 0x22 && cid2 == 0x23) @@ -151,7 +154,6 @@ default_decompress_parms (j_decompress_ptr cinfo) default: WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform); cinfo->jpeg_color_space = JCS_YCbCr; /* assume it's YCbCr */ - break; } } else { TRACEMS3(cinfo, 1, JTRC_UNKNOWN_IDS, cid0, cid1, cid2); @@ -160,9 +162,22 @@ default_decompress_parms (j_decompress_ptr cinfo) /* Always guess RGB is proper output colorspace. */ cinfo->out_color_space = JCS_RGB; break; - + case 4: - if (cinfo->saw_Adobe_marker) { + cid0 = cinfo->comp_info[0].component_id; + cid1 = cinfo->comp_info[1].component_id; + cid2 = cinfo->comp_info[2].component_id; + cid3 = cinfo->comp_info[3].component_id; + + /* For robust detection of standard colorspaces + * regardless of the presence of special markers, + * check component IDs from SOF marker first. + */ + if (cid0 == 0x01 && cid1 == 0x02 && cid2 == 0x03 && cid3 == 0x04) + cinfo->jpeg_color_space = JCS_YCCK; + else if (cid0 == 0x43 && cid1 == 0x4D && cid2 == 0x59 && cid3 == 0x4B) + cinfo->jpeg_color_space = JCS_CMYK; /* ASCII 'C', 'M', 'Y', 'K' */ + else if (cinfo->saw_Adobe_marker) { switch (cinfo->Adobe_transform) { case 0: cinfo->jpeg_color_space = JCS_CMYK; @@ -173,19 +188,17 @@ default_decompress_parms (j_decompress_ptr cinfo) default: WARNMS1(cinfo, JWRN_ADOBE_XFORM, cinfo->Adobe_transform); cinfo->jpeg_color_space = JCS_YCCK; /* assume it's YCCK */ - break; } } else { - /* No special markers, assume straight CMYK. */ + /* Unknown IDs and no special markers, assume straight CMYK. */ cinfo->jpeg_color_space = JCS_CMYK; } cinfo->out_color_space = JCS_CMYK; break; - + default: cinfo->jpeg_color_space = JCS_UNKNOWN; cinfo->out_color_space = JCS_UNKNOWN; - break; } /* Set defaults for other decompression parameters. */ |