481 lines
15 KiB
C
481 lines
15 KiB
C
/*
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* rdbmp.c
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*
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* Modified 2009-2010 by Guido Vollbeding.
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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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* This file contains routines to read input images in Microsoft "BMP"
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* format (MS Windows 3.x, OS/2 1.x, and OS/2 2.x flavors).
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* Currently, only 8-bit and 24-bit images are supported, not 1-bit or
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* 4-bit (feeding such low-depth images into JPEG would be silly anyway).
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* Also, we don't support RLE-compressed files.
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*
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* These routines may need modification for non-Unix environments or
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* specialized applications. As they stand, they assume input from
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* an ordinary stdio stream. They further assume that reading begins
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* at the start of the file; start_input may need work if the
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* user interface has already read some data (e.g., to determine that
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* the file is indeed BMP format).
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*
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* This code contributed by James Arthur Boucher.
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#ifdef BMP_SUPPORTED
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/* Macros to deal with unsigned chars as efficiently as compiler allows */
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#ifdef HAVE_UNSIGNED_CHAR
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typedef unsigned char U_CHAR;
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#define UCH(x) ((int) (x))
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#else /* !HAVE_UNSIGNED_CHAR */
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#ifdef CHAR_IS_UNSIGNED
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typedef char U_CHAR;
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#define UCH(x) ((int) (x))
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#else
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typedef char U_CHAR;
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#define UCH(x) ((int) (x) & 0xFF)
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#endif
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#endif /* HAVE_UNSIGNED_CHAR */
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#define ReadOK(file,buffer,len) (JFREAD(file,buffer,len) == ((size_t) (len)))
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/* Private version of data source object */
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typedef struct _bmp_source_struct * bmp_source_ptr;
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typedef struct _bmp_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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JSAMPARRAY colormap; /* BMP colormap (converted to my format) */
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jvirt_sarray_ptr whole_image; /* Needed to reverse row order */
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JDIMENSION source_row; /* Current source row number */
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JDIMENSION row_width; /* Physical width of scanlines in file */
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int bits_per_pixel; /* remembers 8- or 24-bit format */
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} bmp_source_struct;
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LOCAL(int)
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read_byte (bmp_source_ptr sinfo)
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/* Read next byte from BMP file */
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{
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register FILE *infile = sinfo->pub.input_file;
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register int c;
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if ((c = getc(infile)) == EOF)
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ERREXIT(sinfo->cinfo, JERR_INPUT_EOF);
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return c;
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}
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LOCAL(void)
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read_colormap (bmp_source_ptr sinfo, int cmaplen, int mapentrysize)
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/* Read the colormap from a BMP file */
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{
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int i;
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switch (mapentrysize) {
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case 3:
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/* BGR format (occurs in OS/2 files) */
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for (i = 0; i < cmaplen; i++) {
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sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo);
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sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo);
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sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo);
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}
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break;
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case 4:
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/* BGR0 format (occurs in MS Windows files) */
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for (i = 0; i < cmaplen; i++) {
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sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo);
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sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo);
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sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo);
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(void) read_byte(sinfo);
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}
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break;
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default:
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ERREXIT(sinfo->cinfo, JERR_BMP_BADCMAP);
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break;
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}
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}
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/*
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* Read one row of pixels.
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* The image has been read into the whole_image array, but is otherwise
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* unprocessed. We must read it out in top-to-bottom row order, and if
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* it is an 8-bit image, we must expand colormapped pixels to 24bit format.
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*/
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METHODDEF(JDIMENSION)
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get_8bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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/* This version is for reading 8-bit colormap indexes */
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{
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bmp_source_ptr source = (bmp_source_ptr) sinfo;
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register JSAMPARRAY colormap = source->colormap;
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JSAMPARRAY image_ptr;
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register int t;
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register JSAMPROW inptr, outptr;
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register JDIMENSION col;
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/* Fetch next row from virtual array */
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source->source_row--;
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, source->whole_image,
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source->source_row, (JDIMENSION) 1, FALSE);
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/* Expand the colormap indexes to real data */
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inptr = image_ptr[0];
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outptr = source->pub.buffer[0];
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for (col = cinfo->image_width; col > 0; col--) {
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t = GETJSAMPLE(*inptr++);
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*outptr++ = colormap[0][t]; /* can omit GETJSAMPLE() safely */
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*outptr++ = colormap[1][t];
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*outptr++ = colormap[2][t];
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}
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return 1;
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}
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METHODDEF(JDIMENSION)
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get_24bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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/* This version is for reading 24-bit pixels */
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{
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bmp_source_ptr source = (bmp_source_ptr) sinfo;
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JSAMPARRAY image_ptr;
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register JSAMPROW inptr, outptr;
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register JDIMENSION col;
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/* Fetch next row from virtual array */
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source->source_row--;
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, source->whole_image,
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source->source_row, (JDIMENSION) 1, FALSE);
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/* Transfer data. Note source values are in BGR order
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* (even though Microsoft's own documents say the opposite).
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*/
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inptr = image_ptr[0];
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outptr = source->pub.buffer[0];
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for (col = cinfo->image_width; col > 0; col--) {
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outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[1] = *inptr++;
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outptr[0] = *inptr++;
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outptr += 3;
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}
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return 1;
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}
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METHODDEF(JDIMENSION)
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get_32bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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/* This version is for reading 32-bit pixels */
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{
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bmp_source_ptr source = (bmp_source_ptr) sinfo;
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JSAMPARRAY image_ptr;
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register JSAMPROW inptr, outptr;
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register JDIMENSION col;
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/* Fetch next row from virtual array */
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source->source_row--;
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, source->whole_image,
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source->source_row, (JDIMENSION) 1, FALSE);
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/* Transfer data. Note source values are in BGR order
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* (even though Microsoft's own documents say the opposite).
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*/
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inptr = image_ptr[0];
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outptr = source->pub.buffer[0];
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for (col = cinfo->image_width; col > 0; col--) {
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outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[1] = *inptr++;
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outptr[0] = *inptr++;
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inptr++; /* skip the 4th byte (Alpha channel) */
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outptr += 3;
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}
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return 1;
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}
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/*
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* This method loads the image into whole_image during the first call on
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* get_pixel_rows. The get_pixel_rows pointer is then adjusted to call
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* get_8bit_row, get_24bit_row, or get_32bit_row on subsequent calls.
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*/
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METHODDEF(JDIMENSION)
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preload_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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bmp_source_ptr source = (bmp_source_ptr) sinfo;
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register FILE *infile = source->pub.input_file;
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register int c;
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register JSAMPROW out_ptr;
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JSAMPARRAY image_ptr;
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JDIMENSION row, col;
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cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
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/* Read the data into a virtual array in input-file row order. */
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for (row = 0; row < cinfo->image_height; row++) {
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if (progress != NULL) {
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progress->pub.pass_counter = (long) row;
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progress->pub.pass_limit = (long) cinfo->image_height;
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(*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
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}
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image_ptr = (*cinfo->mem->access_virt_sarray)
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((j_common_ptr) cinfo, source->whole_image,
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row, (JDIMENSION) 1, TRUE);
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out_ptr = image_ptr[0];
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for (col = source->row_width; col > 0; col--) {
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/* inline copy of read_byte() for speed */
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if ((c = getc(infile)) == EOF)
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ERREXIT(cinfo, JERR_INPUT_EOF);
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*out_ptr++ = (JSAMPLE) c;
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}
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}
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if (progress != NULL)
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progress->completed_extra_passes++;
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/* Set up to read from the virtual array in top-to-bottom order */
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switch (source->bits_per_pixel) {
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case 8:
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source->pub.get_pixel_rows = get_8bit_row;
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break;
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case 24:
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source->pub.get_pixel_rows = get_24bit_row;
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break;
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case 32:
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source->pub.get_pixel_rows = get_32bit_row;
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break;
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default:
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ERREXIT(cinfo, JERR_BMP_BADDEPTH);
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}
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source->source_row = cinfo->image_height;
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/* And read the first row */
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return (*source->pub.get_pixel_rows) (cinfo, sinfo);
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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_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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bmp_source_ptr source = (bmp_source_ptr) sinfo;
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U_CHAR bmpfileheader[14];
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U_CHAR bmpinfoheader[64];
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#define GET_2B(array,offset) ((unsigned int) UCH(array[offset]) + \
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(((unsigned int) UCH(array[offset+1])) << 8))
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#define GET_4B(array,offset) ((INT32) UCH(array[offset]) + \
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(((INT32) UCH(array[offset+1])) << 8) + \
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(((INT32) UCH(array[offset+2])) << 16) + \
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(((INT32) UCH(array[offset+3])) << 24))
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INT32 bfOffBits;
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INT32 headerSize;
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INT32 biWidth;
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INT32 biHeight;
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unsigned int biPlanes;
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INT32 biCompression;
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INT32 biXPelsPerMeter,biYPelsPerMeter;
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INT32 biClrUsed = 0;
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int mapentrysize = 0; /* 0 indicates no colormap */
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INT32 bPad;
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JDIMENSION row_width;
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/* Read and verify the bitmap file header */
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if (! ReadOK(source->pub.input_file, bmpfileheader, 14))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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if (GET_2B(bmpfileheader,0) != 0x4D42) /* 'BM' */
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ERREXIT(cinfo, JERR_BMP_NOT);
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bfOffBits = (INT32) GET_4B(bmpfileheader,10);
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/* We ignore the remaining fileheader fields */
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/* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows),
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* or 64 bytes (OS/2 2.x). Check the first 4 bytes to find out which.
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*/
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if (! ReadOK(source->pub.input_file, bmpinfoheader, 4))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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headerSize = (INT32) GET_4B(bmpinfoheader,0);
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if (headerSize < 12 || headerSize > 64)
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ERREXIT(cinfo, JERR_BMP_BADHEADER);
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if (! ReadOK(source->pub.input_file, bmpinfoheader+4, headerSize-4))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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switch ((int) headerSize) {
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case 12:
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/* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */
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biWidth = (INT32) GET_2B(bmpinfoheader,4);
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biHeight = (INT32) GET_2B(bmpinfoheader,6);
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biPlanes = GET_2B(bmpinfoheader,8);
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source->bits_per_pixel = (int) GET_2B(bmpinfoheader,10);
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switch (source->bits_per_pixel) {
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case 8: /* colormapped image */
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mapentrysize = 3; /* OS/2 uses RGBTRIPLE colormap */
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TRACEMS2(cinfo, 1, JTRC_BMP_OS2_MAPPED, (int) biWidth, (int) biHeight);
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break;
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case 24: /* RGB image */
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TRACEMS2(cinfo, 1, JTRC_BMP_OS2, (int) biWidth, (int) biHeight);
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break;
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default:
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ERREXIT(cinfo, JERR_BMP_BADDEPTH);
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break;
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}
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break;
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case 40:
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case 64:
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/* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */
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/* or OS/2 2.x header, which has additional fields that we ignore */
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biWidth = GET_4B(bmpinfoheader,4);
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biHeight = GET_4B(bmpinfoheader,8);
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biPlanes = GET_2B(bmpinfoheader,12);
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source->bits_per_pixel = (int) GET_2B(bmpinfoheader,14);
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biCompression = GET_4B(bmpinfoheader,16);
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biXPelsPerMeter = GET_4B(bmpinfoheader,24);
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biYPelsPerMeter = GET_4B(bmpinfoheader,28);
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biClrUsed = GET_4B(bmpinfoheader,32);
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/* biSizeImage, biClrImportant fields are ignored */
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switch (source->bits_per_pixel) {
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case 8: /* colormapped image */
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mapentrysize = 4; /* Windows uses RGBQUAD colormap */
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TRACEMS2(cinfo, 1, JTRC_BMP_MAPPED, (int) biWidth, (int) biHeight);
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break;
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case 24: /* RGB image */
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TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight);
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break;
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case 32: /* RGB image + Alpha channel */
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TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight);
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break;
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default:
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ERREXIT(cinfo, JERR_BMP_BADDEPTH);
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break;
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}
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if (biCompression != 0)
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ERREXIT(cinfo, JERR_BMP_COMPRESSED);
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if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0) {
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/* Set JFIF density parameters from the BMP data */
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cinfo->X_density = (UINT16) (biXPelsPerMeter/100); /* 100 cm per meter */
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cinfo->Y_density = (UINT16) (biYPelsPerMeter/100);
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cinfo->density_unit = 2; /* dots/cm */
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}
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break;
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default:
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ERREXIT(cinfo, JERR_BMP_BADHEADER);
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return;
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}
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if (biWidth <= 0 || biHeight <= 0)
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ERREXIT(cinfo, JERR_BMP_EMPTY);
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if (biPlanes != 1)
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ERREXIT(cinfo, JERR_BMP_BADPLANES);
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/* Compute distance to bitmap data --- will adjust for colormap below */
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bPad = bfOffBits - (headerSize + 14);
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/* Read the colormap, if any */
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if (mapentrysize > 0) {
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if (biClrUsed <= 0)
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biClrUsed = 256; /* assume it's 256 */
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else if (biClrUsed > 256)
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ERREXIT(cinfo, JERR_BMP_BADCMAP);
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/* Allocate space to store the colormap */
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source->colormap = (*cinfo->mem->alloc_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE,
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(JDIMENSION) biClrUsed, (JDIMENSION) 3);
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/* and read it from the file */
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read_colormap(source, (int) biClrUsed, mapentrysize);
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/* account for size of colormap */
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bPad -= biClrUsed * mapentrysize;
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}
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/* Skip any remaining pad bytes */
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if (bPad < 0) /* incorrect bfOffBits value? */
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ERREXIT(cinfo, JERR_BMP_BADHEADER);
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while (--bPad >= 0) {
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(void) read_byte(source);
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}
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/* Compute row width in file, including padding to 4-byte boundary */
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if (source->bits_per_pixel == 24)
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row_width = (JDIMENSION) (biWidth * 3);
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else if (source->bits_per_pixel == 32)
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row_width = (JDIMENSION) (biWidth * 4);
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else
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row_width = (JDIMENSION) biWidth;
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while ((row_width & 3) != 0) row_width++;
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source->row_width = row_width;
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/* Allocate space for inversion array, prepare for preload pass */
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source->whole_image = (*cinfo->mem->request_virt_sarray)
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((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
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row_width, (JDIMENSION) biHeight, (JDIMENSION) 1);
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source->pub.get_pixel_rows = preload_image;
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if (cinfo->progress != NULL) {
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cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
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progress->total_extra_passes++; /* count file input as separate pass */
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}
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/* Allocate one-row buffer for returned data */
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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) (biWidth * 3), (JDIMENSION) 1);
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source->pub.buffer_height = 1;
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cinfo->in_color_space = JCS_RGB;
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cinfo->input_components = 3;
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cinfo->data_precision = 8;
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cinfo->image_width = (JDIMENSION) biWidth;
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cinfo->image_height = (JDIMENSION) biHeight;
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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_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
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{
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/* no work */
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}
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/*
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* The module selection routine for BMP format input.
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*/
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GLOBAL(cjpeg_source_ptr)
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jinit_read_bmp (j_compress_ptr cinfo)
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{
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bmp_source_ptr source;
|
|
|
|
/* Create module interface object */
|
|
source = (bmp_source_ptr)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
|
SIZEOF(bmp_source_struct));
|
|
source->cinfo = cinfo; /* make back link for subroutines */
|
|
/* Fill in method ptrs, except get_pixel_rows which start_input sets */
|
|
source->pub.start_input = start_input_bmp;
|
|
source->pub.finish_input = finish_input_bmp;
|
|
|
|
return (cjpeg_source_ptr) source;
|
|
}
|
|
|
|
#endif /* BMP_SUPPORTED */
|