161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/*
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* rdjpeg.c
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*
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* Copyright (C) 1991-1996, Thomas G. Lane.
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* mozjpeg Modifications:
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* Copyright (C) 2014, Mozilla Corporation.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#if JPEG_RAW_READER
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#define NUM_ROWS 32
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#endif
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/* Private version of data source object */
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typedef struct _jpeg_source_struct * jpeg_source_ptr;
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typedef struct _jpeg_source_struct {
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struct cjpeg_source_struct pub; /* public fields */
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j_compress_ptr cinfo; /* back link saves passing separate parm */
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struct jpeg_decompress_struct dinfo;
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struct jpeg_error_mgr jerr;
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} jpeg_source_struct;
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METHODDEF(JDIMENSION)
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get_rows (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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jpeg_source_ptr source = (jpeg_source_ptr) sinfo;
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#if !JPEG_RAW_READER
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return jpeg_read_scanlines(&source->dinfo, source->pub.buffer, source->pub.buffer_height);
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#else
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jpeg_read_raw_data(&source->dinfo, source->pub.plane_pointer, 8*cinfo->max_v_samp_factor);
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return 8*cinfo->max_v_samp_factor;
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#endif
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}
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/*
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* Read the file header; return image size and component count.
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*/
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METHODDEF(void)
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start_input_jpeg (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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#if JPEG_RAW_READER
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int i;
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#endif
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int m;
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jpeg_source_ptr source = (jpeg_source_ptr) sinfo;
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source->dinfo.err = jpeg_std_error(&source->jerr);
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jpeg_create_decompress(&source->dinfo);
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jpeg_stdio_src(&source->dinfo, source->pub.input_file);
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jpeg_save_markers(&source->dinfo, JPEG_COM, 0xFFFF);
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for (m = 0; m < 16; m++)
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jpeg_save_markers(&source->dinfo, JPEG_APP0 + m, 0xFFFF);
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jpeg_read_header(&source->dinfo, TRUE);
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source->pub.marker_list = source->dinfo.marker_list;
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#if !JPEG_RAW_READER
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source->dinfo.raw_data_out = FALSE;
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jpeg_start_decompress(&source->dinfo);
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cinfo->in_color_space = source->dinfo.out_color_space;
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cinfo->input_components = source->dinfo.output_components;
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cinfo->data_precision = source->dinfo.data_precision;
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cinfo->image_width = source->dinfo.image_width;
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cinfo->image_height = source->dinfo.image_height;
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cinfo->raw_data_in = FALSE;
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source->pub.buffer = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE,
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(JDIMENSION) (cinfo->image_width * cinfo->input_components), (JDIMENSION) 1);
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source->pub.buffer_height = 1;
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#else
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source->dinfo.raw_data_out = TRUE;
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source->dinfo.do_fancy_upsampling = FALSE;
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jpeg_start_decompress(&source->dinfo);
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cinfo->in_color_space = source->dinfo.out_color_space;
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cinfo->input_components = source->dinfo.output_components;
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cinfo->data_precision = source->dinfo.data_precision;
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cinfo->image_width = source->dinfo.image_width;
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cinfo->image_height = source->dinfo.image_height;
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jpeg_set_colorspace(cinfo, source->dinfo.jpeg_color_space);
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cinfo->max_v_samp_factor = source->dinfo.max_v_samp_factor;
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cinfo->max_h_samp_factor = source->dinfo.max_h_samp_factor;
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cinfo->raw_data_in = TRUE;
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#if JPEG_LIB_VERSION >= 70
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cinfo->do_fancy_upsampling = FALSE;
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#endif
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for (i = 0; i < cinfo->input_components; i++) {
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cinfo->comp_info[i].h_samp_factor = source->dinfo.comp_info[i].h_samp_factor;
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cinfo->comp_info[i].v_samp_factor = source->dinfo.comp_info[i].v_samp_factor;
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source->pub.plane_pointer[i] = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE,
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(JDIMENSION) cinfo->image_width, (JDIMENSION) NUM_ROWS);
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}
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#endif
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source->pub.get_pixel_rows = get_rows;
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}
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/*
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* Finish up at the end of the file.
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*/
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METHODDEF(void)
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finish_input_jpeg (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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jpeg_source_ptr source = (jpeg_source_ptr) sinfo;
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jpeg_finish_decompress(&source->dinfo);
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jpeg_destroy_decompress(&source->dinfo);
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}
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/*
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* The module selection routine for JPEG format input.
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*/
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GLOBAL(cjpeg_source_ptr)
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jinit_read_jpeg (j_compress_ptr cinfo)
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{
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jpeg_source_ptr source;
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/* Create module interface object */
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source = (jpeg_source_ptr)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
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sizeof(jpeg_source_struct));
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source->cinfo = cinfo; /* make back link for subroutines */
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/* Fill in method ptrs, except get_pixel_rows which start_input sets */
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source->pub.start_input = start_input_jpeg;
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source->pub.finish_input = finish_input_jpeg;
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return (cjpeg_source_ptr) source;
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}
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