mirror of https://github.com/axmolengine/axmol.git
690 lines
22 KiB
C
690 lines
22 KiB
C
/*
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* rdbmp.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* Modified 2009-2017 by Guido Vollbeding.
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* libjpeg-turbo Modifications:
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* Modified 2011 by Siarhei Siamashka.
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* Copyright (C) 2015, 2017-2018, D. R. Commander.
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* For conditions of distribution and use, see the accompanying README.ijg
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* 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 "cmyk.h"
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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_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) \
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(JFREAD(file, buffer, len) == ((size_t)(len)))
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static int alpha_index[JPEG_NUMCS] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1
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};
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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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int cmap_length; /* colormap length */
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boolean use_inversion_array; /* TRUE = preload the whole image, which is
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stored in bottom-up order, and feed it to
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the calling program in top-down order
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FALSE = the calling program will maintain
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its own image buffer and read the rows in
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bottom-up order */
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U_CHAR *iobuffer; /* I/O buffer (used to buffer a single row from
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disk if use_inversion_array == FALSE) */
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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, gray = 1;
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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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if (sinfo->colormap[2][i] != sinfo->colormap[1][i] ||
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sinfo->colormap[1][i] != sinfo->colormap[0][i])
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gray = 0;
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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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if (sinfo->colormap[2][i] != sinfo->colormap[1][i] ||
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sinfo->colormap[1][i] != sinfo->colormap[0][i])
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gray = 0;
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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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if (sinfo->cinfo->in_color_space == JCS_UNKNOWN && gray)
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sinfo->cinfo->in_color_space = JCS_GRAYSCALE;
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if (sinfo->cinfo->in_color_space == JCS_GRAYSCALE && !gray)
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ERREXIT(sinfo->cinfo, JERR_BAD_IN_COLORSPACE);
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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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int cmaplen = source->cmap_length;
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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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if (source->use_inversion_array) {
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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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inptr = image_ptr[0];
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} else {
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if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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inptr = source->iobuffer;
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}
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/* Expand the colormap indexes to real data */
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outptr = source->pub.buffer[0];
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if (cinfo->in_color_space == JCS_GRAYSCALE) {
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for (col = cinfo->image_width; col > 0; col--) {
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t = GETJSAMPLE(*inptr++);
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if (t >= cmaplen)
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ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
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*outptr++ = colormap[0][t];
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}
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} else if (cinfo->in_color_space == JCS_CMYK) {
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for (col = cinfo->image_width; col > 0; col--) {
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t = GETJSAMPLE(*inptr++);
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if (t >= cmaplen)
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ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
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rgb_to_cmyk(colormap[0][t], colormap[1][t], colormap[2][t], outptr,
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outptr + 1, outptr + 2, outptr + 3);
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outptr += 4;
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}
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} else {
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register int rindex = rgb_red[cinfo->in_color_space];
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register int gindex = rgb_green[cinfo->in_color_space];
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register int bindex = rgb_blue[cinfo->in_color_space];
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register int aindex = alpha_index[cinfo->in_color_space];
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register int ps = rgb_pixelsize[cinfo->in_color_space];
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if (aindex >= 0) {
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for (col = cinfo->image_width; col > 0; col--) {
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t = GETJSAMPLE(*inptr++);
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if (t >= cmaplen)
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ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
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outptr[rindex] = colormap[0][t];
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outptr[gindex] = colormap[1][t];
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outptr[bindex] = colormap[2][t];
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outptr[aindex] = 0xFF;
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outptr += ps;
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}
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} else {
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for (col = cinfo->image_width; col > 0; col--) {
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t = GETJSAMPLE(*inptr++);
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if (t >= cmaplen)
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ERREXIT(cinfo, JERR_BMP_OUTOFRANGE);
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outptr[rindex] = colormap[0][t];
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outptr[gindex] = colormap[1][t];
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outptr[bindex] = colormap[2][t];
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outptr += ps;
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}
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}
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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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if (source->use_inversion_array) {
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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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inptr = image_ptr[0];
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} else {
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if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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inptr = source->iobuffer;
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}
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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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outptr = source->pub.buffer[0];
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if (cinfo->in_color_space == JCS_EXT_BGR) {
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MEMCOPY(outptr, inptr, source->row_width);
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} else if (cinfo->in_color_space == JCS_CMYK) {
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for (col = cinfo->image_width; col > 0; col--) {
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/* can omit GETJSAMPLE() safely */
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JSAMPLE b = *inptr++, g = *inptr++, r = *inptr++;
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rgb_to_cmyk(r, g, b, outptr, outptr + 1, outptr + 2, outptr + 3);
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outptr += 4;
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}
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} else {
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register int rindex = rgb_red[cinfo->in_color_space];
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register int gindex = rgb_green[cinfo->in_color_space];
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register int bindex = rgb_blue[cinfo->in_color_space];
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register int aindex = alpha_index[cinfo->in_color_space];
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register int ps = rgb_pixelsize[cinfo->in_color_space];
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if (aindex >= 0) {
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for (col = cinfo->image_width; col > 0; col--) {
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outptr[bindex] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[gindex] = *inptr++;
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outptr[rindex] = *inptr++;
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outptr[aindex] = 0xFF;
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outptr += ps;
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}
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} else {
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for (col = cinfo->image_width; col > 0; col--) {
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outptr[bindex] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[gindex] = *inptr++;
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outptr[rindex] = *inptr++;
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outptr += ps;
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}
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}
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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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if (source->use_inversion_array) {
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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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inptr = image_ptr[0];
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} else {
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if (!ReadOK(source->pub.input_file, source->iobuffer, source->row_width))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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inptr = source->iobuffer;
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}
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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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outptr = source->pub.buffer[0];
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if (cinfo->in_color_space == JCS_EXT_BGRX ||
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cinfo->in_color_space == JCS_EXT_BGRA) {
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MEMCOPY(outptr, inptr, source->row_width);
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} else if (cinfo->in_color_space == JCS_CMYK) {
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for (col = cinfo->image_width; col > 0; col--) {
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/* can omit GETJSAMPLE() safely */
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JSAMPLE b = *inptr++, g = *inptr++, r = *inptr++;
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rgb_to_cmyk(r, g, b, outptr, outptr + 1, outptr + 2, outptr + 3);
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inptr++; /* skip the 4th byte (Alpha channel) */
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outptr += 4;
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}
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} else {
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register int rindex = rgb_red[cinfo->in_color_space];
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register int gindex = rgb_green[cinfo->in_color_space];
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register int bindex = rgb_blue[cinfo->in_color_space];
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register int aindex = alpha_index[cinfo->in_color_space];
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register int ps = rgb_pixelsize[cinfo->in_color_space];
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if (aindex >= 0) {
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for (col = cinfo->image_width; col > 0; col--) {
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outptr[bindex] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[gindex] = *inptr++;
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outptr[rindex] = *inptr++;
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outptr[aindex] = *inptr++;
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outptr += ps;
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}
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} else {
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for (col = cinfo->image_width; col > 0; col--) {
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outptr[bindex] = *inptr++; /* can omit GETJSAMPLE() safely */
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outptr[gindex] = *inptr++;
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outptr[rindex] = *inptr++;
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inptr++; /* skip the 4th byte (Alpha channel) */
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outptr += ps;
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}
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}
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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 JSAMPROW out_ptr;
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JSAMPARRAY image_ptr;
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JDIMENSION row;
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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, row, (JDIMENSION)1, TRUE);
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out_ptr = image_ptr[0];
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if (fread(out_ptr, 1, source->row_width, infile) != source->row_width) {
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if (feof(infile))
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ERREXIT(cinfo, JERR_INPUT_EOF);
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else
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ERREXIT(cinfo, JERR_FILE_READ);
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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) \
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((unsigned short)UCH(array[offset]) + \
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(((unsigned short)UCH(array[offset + 1])) << 8))
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#define GET_4B(array, offset) \
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((unsigned int)UCH(array[offset]) + \
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(((unsigned int)UCH(array[offset + 1])) << 8) + \
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(((unsigned int)UCH(array[offset + 2])) << 16) + \
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(((unsigned int)UCH(array[offset + 3])) << 24))
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unsigned int bfOffBits;
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unsigned int headerSize;
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int biWidth;
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int biHeight;
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unsigned short biPlanes;
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unsigned int biCompression;
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int biXPelsPerMeter, biYPelsPerMeter;
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unsigned int biClrUsed = 0;
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int mapentrysize = 0; /* 0 indicates no colormap */
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int bPad;
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JDIMENSION row_width = 0;
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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 = GET_4B(bmpfileheader, 10);
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/* We ignore the remaining fileheader fields */
|
|
|
|
/* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows),
|
|
* or 64 bytes (OS/2 2.x). Check the first 4 bytes to find out which.
|
|
*/
|
|
if (!ReadOK(source->pub.input_file, bmpinfoheader, 4))
|
|
ERREXIT(cinfo, JERR_INPUT_EOF);
|
|
headerSize = GET_4B(bmpinfoheader, 0);
|
|
if (headerSize < 12 || headerSize > 64)
|
|
ERREXIT(cinfo, JERR_BMP_BADHEADER);
|
|
if (!ReadOK(source->pub.input_file, bmpinfoheader + 4, headerSize - 4))
|
|
ERREXIT(cinfo, JERR_INPUT_EOF);
|
|
|
|
switch (headerSize) {
|
|
case 12:
|
|
/* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */
|
|
biWidth = (int)GET_2B(bmpinfoheader, 4);
|
|
biHeight = (int)GET_2B(bmpinfoheader, 6);
|
|
biPlanes = GET_2B(bmpinfoheader, 8);
|
|
source->bits_per_pixel = (int)GET_2B(bmpinfoheader, 10);
|
|
|
|
switch (source->bits_per_pixel) {
|
|
case 8: /* colormapped image */
|
|
mapentrysize = 3; /* OS/2 uses RGBTRIPLE colormap */
|
|
TRACEMS2(cinfo, 1, JTRC_BMP_OS2_MAPPED, biWidth, biHeight);
|
|
break;
|
|
case 24: /* RGB image */
|
|
TRACEMS2(cinfo, 1, JTRC_BMP_OS2, biWidth, biHeight);
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
|
|
break;
|
|
}
|
|
break;
|
|
case 40:
|
|
case 64:
|
|
/* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */
|
|
/* or OS/2 2.x header, which has additional fields that we ignore */
|
|
biWidth = (int)GET_4B(bmpinfoheader, 4);
|
|
biHeight = (int)GET_4B(bmpinfoheader, 8);
|
|
biPlanes = GET_2B(bmpinfoheader, 12);
|
|
source->bits_per_pixel = (int)GET_2B(bmpinfoheader, 14);
|
|
biCompression = GET_4B(bmpinfoheader, 16);
|
|
biXPelsPerMeter = (int)GET_4B(bmpinfoheader, 24);
|
|
biYPelsPerMeter = (int)GET_4B(bmpinfoheader, 28);
|
|
biClrUsed = GET_4B(bmpinfoheader, 32);
|
|
/* biSizeImage, biClrImportant fields are ignored */
|
|
|
|
switch (source->bits_per_pixel) {
|
|
case 8: /* colormapped image */
|
|
mapentrysize = 4; /* Windows uses RGBQUAD colormap */
|
|
TRACEMS2(cinfo, 1, JTRC_BMP_MAPPED, biWidth, biHeight);
|
|
break;
|
|
case 24: /* RGB image */
|
|
TRACEMS2(cinfo, 1, JTRC_BMP, biWidth, biHeight);
|
|
break;
|
|
case 32: /* RGB image + Alpha channel */
|
|
TRACEMS2(cinfo, 1, JTRC_BMP, biWidth, biHeight);
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
|
|
break;
|
|
}
|
|
if (biCompression != 0)
|
|
ERREXIT(cinfo, JERR_BMP_COMPRESSED);
|
|
|
|
if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0) {
|
|
/* Set JFIF density parameters from the BMP data */
|
|
cinfo->X_density = (UINT16)(biXPelsPerMeter / 100); /* 100 cm per meter */
|
|
cinfo->Y_density = (UINT16)(biYPelsPerMeter / 100);
|
|
cinfo->density_unit = 2; /* dots/cm */
|
|
}
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BMP_BADHEADER);
|
|
return;
|
|
}
|
|
|
|
if (biWidth <= 0 || biHeight <= 0)
|
|
ERREXIT(cinfo, JERR_BMP_EMPTY);
|
|
if (biPlanes != 1)
|
|
ERREXIT(cinfo, JERR_BMP_BADPLANES);
|
|
|
|
/* Compute distance to bitmap data --- will adjust for colormap below */
|
|
bPad = bfOffBits - (headerSize + 14);
|
|
|
|
/* Read the colormap, if any */
|
|
if (mapentrysize > 0) {
|
|
if (biClrUsed <= 0)
|
|
biClrUsed = 256; /* assume it's 256 */
|
|
else if (biClrUsed > 256)
|
|
ERREXIT(cinfo, JERR_BMP_BADCMAP);
|
|
/* Allocate space to store the colormap */
|
|
source->colormap = (*cinfo->mem->alloc_sarray)
|
|
((j_common_ptr)cinfo, JPOOL_IMAGE, (JDIMENSION)biClrUsed, (JDIMENSION)3);
|
|
source->cmap_length = (int)biClrUsed;
|
|
/* and read it from the file */
|
|
read_colormap(source, (int)biClrUsed, mapentrysize);
|
|
/* account for size of colormap */
|
|
bPad -= biClrUsed * mapentrysize;
|
|
}
|
|
|
|
/* Skip any remaining pad bytes */
|
|
if (bPad < 0) /* incorrect bfOffBits value? */
|
|
ERREXIT(cinfo, JERR_BMP_BADHEADER);
|
|
while (--bPad >= 0) {
|
|
(void)read_byte(source);
|
|
}
|
|
|
|
/* Compute row width in file, including padding to 4-byte boundary */
|
|
switch (source->bits_per_pixel) {
|
|
case 8:
|
|
if (cinfo->in_color_space == JCS_UNKNOWN)
|
|
cinfo->in_color_space = JCS_EXT_RGB;
|
|
if (IsExtRGB(cinfo->in_color_space))
|
|
cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
|
|
else if (cinfo->in_color_space == JCS_GRAYSCALE)
|
|
cinfo->input_components = 1;
|
|
else if (cinfo->in_color_space == JCS_CMYK)
|
|
cinfo->input_components = 4;
|
|
else
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
row_width = (JDIMENSION)biWidth;
|
|
break;
|
|
case 24:
|
|
if (cinfo->in_color_space == JCS_UNKNOWN)
|
|
cinfo->in_color_space = JCS_EXT_BGR;
|
|
if (IsExtRGB(cinfo->in_color_space))
|
|
cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
|
|
else if (cinfo->in_color_space == JCS_CMYK)
|
|
cinfo->input_components = 4;
|
|
else
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
row_width = (JDIMENSION)(biWidth * 3);
|
|
break;
|
|
case 32:
|
|
if (cinfo->in_color_space == JCS_UNKNOWN)
|
|
cinfo->in_color_space = JCS_EXT_BGRA;
|
|
if (IsExtRGB(cinfo->in_color_space))
|
|
cinfo->input_components = rgb_pixelsize[cinfo->in_color_space];
|
|
else if (cinfo->in_color_space == JCS_CMYK)
|
|
cinfo->input_components = 4;
|
|
else
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
row_width = (JDIMENSION)(biWidth * 4);
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
|
|
}
|
|
while ((row_width & 3) != 0) row_width++;
|
|
source->row_width = row_width;
|
|
|
|
if (source->use_inversion_array) {
|
|
/* Allocate space for inversion array, prepare for preload pass */
|
|
source->whole_image = (*cinfo->mem->request_virt_sarray)
|
|
((j_common_ptr)cinfo, JPOOL_IMAGE, FALSE,
|
|
row_width, (JDIMENSION)biHeight, (JDIMENSION)1);
|
|
source->pub.get_pixel_rows = preload_image;
|
|
if (cinfo->progress != NULL) {
|
|
cd_progress_ptr progress = (cd_progress_ptr)cinfo->progress;
|
|
progress->total_extra_passes++; /* count file input as separate pass */
|
|
}
|
|
} else {
|
|
source->iobuffer = (U_CHAR *)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE, row_width);
|
|
switch (source->bits_per_pixel) {
|
|
case 8:
|
|
source->pub.get_pixel_rows = get_8bit_row;
|
|
break;
|
|
case 24:
|
|
source->pub.get_pixel_rows = get_24bit_row;
|
|
break;
|
|
case 32:
|
|
source->pub.get_pixel_rows = get_32bit_row;
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
|
|
}
|
|
}
|
|
|
|
/* Ensure that biWidth * cinfo->input_components doesn't exceed the maximum
|
|
value of the JDIMENSION type. This is only a danger with BMP files, since
|
|
their width and height fields are 32-bit integers. */
|
|
if ((unsigned long long)biWidth *
|
|
(unsigned long long)cinfo->input_components > 0xFFFFFFFFULL)
|
|
ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
|
|
/* Allocate one-row buffer for returned data */
|
|
source->pub.buffer = (*cinfo->mem->alloc_sarray)
|
|
((j_common_ptr)cinfo, JPOOL_IMAGE,
|
|
(JDIMENSION)(biWidth * cinfo->input_components), (JDIMENSION)1);
|
|
source->pub.buffer_height = 1;
|
|
|
|
cinfo->data_precision = 8;
|
|
cinfo->image_width = (JDIMENSION)biWidth;
|
|
cinfo->image_height = (JDIMENSION)biHeight;
|
|
}
|
|
|
|
|
|
/*
|
|
* Finish up at the end of the file.
|
|
*/
|
|
|
|
METHODDEF(void)
|
|
finish_input_bmp(j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
|
{
|
|
/* no work */
|
|
}
|
|
|
|
|
|
/*
|
|
* The module selection routine for BMP format input.
|
|
*/
|
|
|
|
GLOBAL(cjpeg_source_ptr)
|
|
jinit_read_bmp(j_compress_ptr cinfo, boolean use_inversion_array)
|
|
{
|
|
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;
|
|
|
|
source->use_inversion_array = use_inversion_array;
|
|
|
|
return (cjpeg_source_ptr)source;
|
|
}
|
|
|
|
#endif /* BMP_SUPPORTED */
|