diff options
Diffstat (limited to 'src/3rdparty/libjpeg/src/jdapistd.c')
| -rw-r--r-- | src/3rdparty/libjpeg/src/jdapistd.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/src/3rdparty/libjpeg/src/jdapistd.c b/src/3rdparty/libjpeg/src/jdapistd.c index 37afc8448b..105121df2b 100644 --- a/src/3rdparty/libjpeg/src/jdapistd.c +++ b/src/3rdparty/libjpeg/src/jdapistd.c @@ -4,7 +4,7 @@ * This file was part of the Independent JPEG Group's software: * Copyright (C) 1994-1996, Thomas G. Lane. * libjpeg-turbo Modifications: - * Copyright (C) 2010, 2015-2016, D. R. Commander. + * Copyright (C) 2010, 2015-2017, D. R. Commander. * Copyright (C) 2015, Google, Inc. * For conditions of distribution and use, see the accompanying README.ijg * file. @@ -190,7 +190,10 @@ jpeg_crop_scanline (j_decompress_ptr cinfo, JDIMENSION *xoffset, * single-pass decompression case, allowing us to use the same MCU column * width for all of the components. */ - align = cinfo->_min_DCT_scaled_size * cinfo->max_h_samp_factor; + if (cinfo->comps_in_scan == 1 && cinfo->num_components == 1) + align = cinfo->_min_DCT_scaled_size; + else + align = cinfo->_min_DCT_scaled_size * cinfo->max_h_samp_factor; /* Adjust xoffset to the nearest iMCU boundary <= the requested value */ input_xoffset = *xoffset; @@ -215,6 +218,9 @@ jpeg_crop_scanline (j_decompress_ptr cinfo, JDIMENSION *xoffset, for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { + int hsf = (cinfo->comps_in_scan == 1 && cinfo->num_components == 1) ? + 1 : compptr->h_samp_factor; + /* Set downsampled_width to the new output width. */ orig_downsampled_width = compptr->downsampled_width; compptr->downsampled_width = @@ -228,11 +234,10 @@ jpeg_crop_scanline (j_decompress_ptr cinfo, JDIMENSION *xoffset, * values will be used in multi-scan decompressions. */ cinfo->master->first_MCU_col[ci] = - (JDIMENSION) (long) (*xoffset * compptr->h_samp_factor) / - (long) align; + (JDIMENSION) (long) (*xoffset * hsf) / (long) align; cinfo->master->last_MCU_col[ci] = (JDIMENSION) jdiv_round_up((long) ((*xoffset + cinfo->output_width) * - compptr->h_samp_factor), + hsf), (long) align) - 1; } @@ -293,6 +298,14 @@ noop_convert (j_decompress_ptr cinfo, JSAMPIMAGE input_buf, } +/* Dummy quantize function used by jpeg_skip_scanlines() */ +LOCAL(void) +noop_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf, + JSAMPARRAY output_buf, int num_rows) +{ +} + + /* * In some cases, it is best to call jpeg_read_scanlines() and discard the * output, rather than skipping the scanlines, because this allows us to @@ -308,14 +321,22 @@ read_and_discard_scanlines (j_decompress_ptr cinfo, JDIMENSION num_lines) void (*color_convert) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf, JDIMENSION input_row, JSAMPARRAY output_buf, int num_rows); + void (*color_quantize) (j_decompress_ptr cinfo, JSAMPARRAY input_buf, + JSAMPARRAY output_buf, int num_rows) = NULL; color_convert = cinfo->cconvert->color_convert; cinfo->cconvert->color_convert = noop_convert; + if (cinfo->cquantize && cinfo->cquantize->color_quantize) { + color_quantize = cinfo->cquantize->color_quantize; + cinfo->cquantize->color_quantize = noop_quantize; + } for (n = 0; n < num_lines; n++) jpeg_read_scanlines(cinfo, NULL, 1); cinfo->cconvert->color_convert = color_convert; + if (color_quantize) + cinfo->cquantize->color_quantize = color_quantize; } @@ -370,6 +391,8 @@ jpeg_skip_scanlines (j_decompress_ptr cinfo, JDIMENSION num_lines) /* Do not skip past the bottom of the image. */ if (cinfo->output_scanline + num_lines >= cinfo->output_height) { cinfo->output_scanline = cinfo->output_height; + (*cinfo->inputctl->finish_input_pass) (cinfo); + cinfo->inputctl->eoi_reached = TRUE; return cinfo->output_height - cinfo->output_scanline; } |