mirror of
https://github.com/minetest/irrlicht.git
synced 2025-07-02 00:00:26 +02:00
Import irrlicht 1.8.4 release
This commit is contained in:
Loic Blot
459
source/Irrlicht/jpeglib/rdppm.c
Normal file
459
source/Irrlicht/jpeglib/rdppm.c
Normal file
@ -0,0 +1,459 @@
|
||||
/*
|
||||
* rdppm.c
|
||||
*
|
||||
* Copyright (C) 1991-1997, Thomas G. Lane.
|
||||
* Modified 2009 by Bill Allombert, Guido Vollbeding.
|
||||
* This file is part of the Independent JPEG Group's software.
|
||||
* For conditions of distribution and use, see the accompanying README file.
|
||||
*
|
||||
* This file contains routines to read input images in PPM/PGM format.
|
||||
* The extended 2-byte-per-sample raw PPM/PGM formats are supported.
|
||||
* The PBMPLUS library is NOT required to compile this software
|
||||
* (but it is highly useful as a set of PPM image manipulation programs).
|
||||
*
|
||||
* These routines may need modification for non-Unix environments or
|
||||
* specialized applications. As they stand, they assume input from
|
||||
* an ordinary stdio stream. They further assume that reading begins
|
||||
* at the start of the file; start_input may need work if the
|
||||
* user interface has already read some data (e.g., to determine that
|
||||
* the file is indeed PPM format).
|
||||
*/
|
||||
|
||||
#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
|
||||
|
||||
#ifdef PPM_SUPPORTED
|
||||
|
||||
|
||||
/* Portions of this code are based on the PBMPLUS library, which is:
|
||||
**
|
||||
** Copyright (C) 1988 by Jef Poskanzer.
|
||||
**
|
||||
** Permission to use, copy, modify, and distribute this software and its
|
||||
** documentation for any purpose and without fee is hereby granted, provided
|
||||
** that the above copyright notice appear in all copies and that both that
|
||||
** copyright notice and this permission notice appear in supporting
|
||||
** documentation. This software is provided "as is" without express or
|
||||
** implied warranty.
|
||||
*/
|
||||
|
||||
|
||||
/* Macros to deal with unsigned chars as efficiently as compiler allows */
|
||||
|
||||
#ifdef HAVE_UNSIGNED_CHAR
|
||||
typedef unsigned char U_CHAR;
|
||||
#define UCH(x) ((int) (x))
|
||||
#else /* !HAVE_UNSIGNED_CHAR */
|
||||
#ifdef CHAR_IS_UNSIGNED
|
||||
typedef char U_CHAR;
|
||||
#define UCH(x) ((int) (x))
|
||||
#else
|
||||
typedef char U_CHAR;
|
||||
#define UCH(x) ((int) (x) & 0xFF)
|
||||
#endif
|
||||
#endif /* HAVE_UNSIGNED_CHAR */
|
||||
|
||||
|
||||
#define ReadOK(file,buffer,len) (JFREAD(file,buffer,len) == ((size_t) (len)))
|
||||
|
||||
|
||||
/*
|
||||
* On most systems, reading individual bytes with getc() is drastically less
|
||||
* efficient than buffering a row at a time with fread(). On PCs, we must
|
||||
* allocate the buffer in near data space, because we are assuming small-data
|
||||
* memory model, wherein fread() can't reach far memory. If you need to
|
||||
* process very wide images on a PC, you might have to compile in large-memory
|
||||
* model, or else replace fread() with a getc() loop --- which will be much
|
||||
* slower.
|
||||
*/
|
||||
|
||||
|
||||
/* Private version of data source object */
|
||||
|
||||
typedef struct {
|
||||
struct cjpeg_source_struct pub; /* public fields */
|
||||
|
||||
U_CHAR *iobuffer; /* non-FAR pointer to I/O buffer */
|
||||
JSAMPROW pixrow; /* FAR pointer to same */
|
||||
size_t buffer_width; /* width of I/O buffer */
|
||||
JSAMPLE *rescale; /* => maxval-remapping array, or NULL */
|
||||
} ppm_source_struct;
|
||||
|
||||
typedef ppm_source_struct * ppm_source_ptr;
|
||||
|
||||
|
||||
LOCAL(int)
|
||||
pbm_getc (FILE * infile)
|
||||
/* Read next char, skipping over any comments */
|
||||
/* A comment/newline sequence is returned as a newline */
|
||||
{
|
||||
register int ch;
|
||||
|
||||
ch = getc(infile);
|
||||
if (ch == '#') {
|
||||
do {
|
||||
ch = getc(infile);
|
||||
} while (ch != '\n' && ch != EOF);
|
||||
}
|
||||
return ch;
|
||||
}
|
||||
|
||||
|
||||
LOCAL(unsigned int)
|
||||
read_pbm_integer (j_compress_ptr cinfo, FILE * infile)
|
||||
/* Read an unsigned decimal integer from the PPM file */
|
||||
/* Swallows one trailing character after the integer */
|
||||
/* Note that on a 16-bit-int machine, only values up to 64k can be read. */
|
||||
/* This should not be a problem in practice. */
|
||||
{
|
||||
register int ch;
|
||||
register unsigned int val;
|
||||
|
||||
/* Skip any leading whitespace */
|
||||
do {
|
||||
ch = pbm_getc(infile);
|
||||
if (ch == EOF)
|
||||
ERREXIT(cinfo, JERR_INPUT_EOF);
|
||||
} while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
|
||||
|
||||
if (ch < '0' || ch > '9')
|
||||
ERREXIT(cinfo, JERR_PPM_NONNUMERIC);
|
||||
|
||||
val = ch - '0';
|
||||
while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') {
|
||||
val *= 10;
|
||||
val += ch - '0';
|
||||
}
|
||||
return val;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Read one row of pixels.
|
||||
*
|
||||
* We provide several different versions depending on input file format.
|
||||
* In all cases, input is scaled to the size of JSAMPLE.
|
||||
*
|
||||
* A really fast path is provided for reading byte/sample raw files with
|
||||
* maxval = MAXJSAMPLE, which is the normal case for 8-bit data.
|
||||
*/
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_text_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading text-format PGM files with any maxval */
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
FILE * infile = source->pub.input_file;
|
||||
register JSAMPROW ptr;
|
||||
register JSAMPLE *rescale = source->rescale;
|
||||
JDIMENSION col;
|
||||
|
||||
ptr = source->pub.buffer[0];
|
||||
for (col = cinfo->image_width; col > 0; col--) {
|
||||
*ptr++ = rescale[read_pbm_integer(cinfo, infile)];
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_text_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading text-format PPM files with any maxval */
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
FILE * infile = source->pub.input_file;
|
||||
register JSAMPROW ptr;
|
||||
register JSAMPLE *rescale = source->rescale;
|
||||
JDIMENSION col;
|
||||
|
||||
ptr = source->pub.buffer[0];
|
||||
for (col = cinfo->image_width; col > 0; col--) {
|
||||
*ptr++ = rescale[read_pbm_integer(cinfo, infile)];
|
||||
*ptr++ = rescale[read_pbm_integer(cinfo, infile)];
|
||||
*ptr++ = rescale[read_pbm_integer(cinfo, infile)];
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_scaled_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading raw-byte-format PGM files with any maxval */
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
register JSAMPROW ptr;
|
||||
register U_CHAR * bufferptr;
|
||||
register JSAMPLE *rescale = source->rescale;
|
||||
JDIMENSION col;
|
||||
|
||||
if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
|
||||
ERREXIT(cinfo, JERR_INPUT_EOF);
|
||||
ptr = source->pub.buffer[0];
|
||||
bufferptr = source->iobuffer;
|
||||
for (col = cinfo->image_width; col > 0; col--) {
|
||||
*ptr++ = rescale[UCH(*bufferptr++)];
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_scaled_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading raw-byte-format PPM files with any maxval */
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
register JSAMPROW ptr;
|
||||
register U_CHAR * bufferptr;
|
||||
register JSAMPLE *rescale = source->rescale;
|
||||
JDIMENSION col;
|
||||
|
||||
if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
|
||||
ERREXIT(cinfo, JERR_INPUT_EOF);
|
||||
ptr = source->pub.buffer[0];
|
||||
bufferptr = source->iobuffer;
|
||||
for (col = cinfo->image_width; col > 0; col--) {
|
||||
*ptr++ = rescale[UCH(*bufferptr++)];
|
||||
*ptr++ = rescale[UCH(*bufferptr++)];
|
||||
*ptr++ = rescale[UCH(*bufferptr++)];
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_raw_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading raw-byte-format files with maxval = MAXJSAMPLE.
|
||||
* In this case we just read right into the JSAMPLE buffer!
|
||||
* Note that same code works for PPM and PGM files.
|
||||
*/
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
|
||||
if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
|
||||
ERREXIT(cinfo, JERR_INPUT_EOF);
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_word_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading raw-word-format PGM files with any maxval */
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
register JSAMPROW ptr;
|
||||
register U_CHAR * bufferptr;
|
||||
register JSAMPLE *rescale = source->rescale;
|
||||
JDIMENSION col;
|
||||
|
||||
if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
|
||||
ERREXIT(cinfo, JERR_INPUT_EOF);
|
||||
ptr = source->pub.buffer[0];
|
||||
bufferptr = source->iobuffer;
|
||||
for (col = cinfo->image_width; col > 0; col--) {
|
||||
register int temp;
|
||||
temp = UCH(*bufferptr++) << 8;
|
||||
temp |= UCH(*bufferptr++);
|
||||
*ptr++ = rescale[temp];
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
METHODDEF(JDIMENSION)
|
||||
get_word_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
/* This version is for reading raw-word-format PPM files with any maxval */
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
register JSAMPROW ptr;
|
||||
register U_CHAR * bufferptr;
|
||||
register JSAMPLE *rescale = source->rescale;
|
||||
JDIMENSION col;
|
||||
|
||||
if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width))
|
||||
ERREXIT(cinfo, JERR_INPUT_EOF);
|
||||
ptr = source->pub.buffer[0];
|
||||
bufferptr = source->iobuffer;
|
||||
for (col = cinfo->image_width; col > 0; col--) {
|
||||
register int temp;
|
||||
temp = UCH(*bufferptr++) << 8;
|
||||
temp |= UCH(*bufferptr++);
|
||||
*ptr++ = rescale[temp];
|
||||
temp = UCH(*bufferptr++) << 8;
|
||||
temp |= UCH(*bufferptr++);
|
||||
*ptr++ = rescale[temp];
|
||||
temp = UCH(*bufferptr++) << 8;
|
||||
temp |= UCH(*bufferptr++);
|
||||
*ptr++ = rescale[temp];
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Read the file header; return image size and component count.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
start_input_ppm (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
{
|
||||
ppm_source_ptr source = (ppm_source_ptr) sinfo;
|
||||
int c;
|
||||
unsigned int w, h, maxval;
|
||||
boolean need_iobuffer, use_raw_buffer, need_rescale;
|
||||
|
||||
if (getc(source->pub.input_file) != 'P')
|
||||
ERREXIT(cinfo, JERR_PPM_NOT);
|
||||
|
||||
c = getc(source->pub.input_file); /* subformat discriminator character */
|
||||
|
||||
/* detect unsupported variants (ie, PBM) before trying to read header */
|
||||
switch (c) {
|
||||
case '2': /* it's a text-format PGM file */
|
||||
case '3': /* it's a text-format PPM file */
|
||||
case '5': /* it's a raw-format PGM file */
|
||||
case '6': /* it's a raw-format PPM file */
|
||||
break;
|
||||
default:
|
||||
ERREXIT(cinfo, JERR_PPM_NOT);
|
||||
break;
|
||||
}
|
||||
|
||||
/* fetch the remaining header info */
|
||||
w = read_pbm_integer(cinfo, source->pub.input_file);
|
||||
h = read_pbm_integer(cinfo, source->pub.input_file);
|
||||
maxval = read_pbm_integer(cinfo, source->pub.input_file);
|
||||
|
||||
if (w <= 0 || h <= 0 || maxval <= 0) /* error check */
|
||||
ERREXIT(cinfo, JERR_PPM_NOT);
|
||||
|
||||
cinfo->data_precision = BITS_IN_JSAMPLE; /* we always rescale data to this */
|
||||
cinfo->image_width = (JDIMENSION) w;
|
||||
cinfo->image_height = (JDIMENSION) h;
|
||||
|
||||
/* initialize flags to most common settings */
|
||||
need_iobuffer = TRUE; /* do we need an I/O buffer? */
|
||||
use_raw_buffer = FALSE; /* do we map input buffer onto I/O buffer? */
|
||||
need_rescale = TRUE; /* do we need a rescale array? */
|
||||
|
||||
switch (c) {
|
||||
case '2': /* it's a text-format PGM file */
|
||||
cinfo->input_components = 1;
|
||||
cinfo->in_color_space = JCS_GRAYSCALE;
|
||||
TRACEMS2(cinfo, 1, JTRC_PGM_TEXT, w, h);
|
||||
source->pub.get_pixel_rows = get_text_gray_row;
|
||||
need_iobuffer = FALSE;
|
||||
break;
|
||||
|
||||
case '3': /* it's a text-format PPM file */
|
||||
cinfo->input_components = 3;
|
||||
cinfo->in_color_space = JCS_RGB;
|
||||
TRACEMS2(cinfo, 1, JTRC_PPM_TEXT, w, h);
|
||||
source->pub.get_pixel_rows = get_text_rgb_row;
|
||||
need_iobuffer = FALSE;
|
||||
break;
|
||||
|
||||
case '5': /* it's a raw-format PGM file */
|
||||
cinfo->input_components = 1;
|
||||
cinfo->in_color_space = JCS_GRAYSCALE;
|
||||
TRACEMS2(cinfo, 1, JTRC_PGM, w, h);
|
||||
if (maxval > 255) {
|
||||
source->pub.get_pixel_rows = get_word_gray_row;
|
||||
} else if (maxval == MAXJSAMPLE && SIZEOF(JSAMPLE) == SIZEOF(U_CHAR)) {
|
||||
source->pub.get_pixel_rows = get_raw_row;
|
||||
use_raw_buffer = TRUE;
|
||||
need_rescale = FALSE;
|
||||
} else {
|
||||
source->pub.get_pixel_rows = get_scaled_gray_row;
|
||||
}
|
||||
break;
|
||||
|
||||
case '6': /* it's a raw-format PPM file */
|
||||
cinfo->input_components = 3;
|
||||
cinfo->in_color_space = JCS_RGB;
|
||||
TRACEMS2(cinfo, 1, JTRC_PPM, w, h);
|
||||
if (maxval > 255) {
|
||||
source->pub.get_pixel_rows = get_word_rgb_row;
|
||||
} else if (maxval == MAXJSAMPLE && SIZEOF(JSAMPLE) == SIZEOF(U_CHAR)) {
|
||||
source->pub.get_pixel_rows = get_raw_row;
|
||||
use_raw_buffer = TRUE;
|
||||
need_rescale = FALSE;
|
||||
} else {
|
||||
source->pub.get_pixel_rows = get_scaled_rgb_row;
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
/* Allocate space for I/O buffer: 1 or 3 bytes or words/pixel. */
|
||||
if (need_iobuffer) {
|
||||
source->buffer_width = (size_t) w * cinfo->input_components *
|
||||
((maxval<=255) ? SIZEOF(U_CHAR) : (2*SIZEOF(U_CHAR)));
|
||||
source->iobuffer = (U_CHAR *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
source->buffer_width);
|
||||
}
|
||||
|
||||
/* Create compressor input buffer. */
|
||||
if (use_raw_buffer) {
|
||||
/* For unscaled raw-input case, we can just map it onto the I/O buffer. */
|
||||
/* Synthesize a JSAMPARRAY pointer structure */
|
||||
/* Cast here implies near->far pointer conversion on PCs */
|
||||
source->pixrow = (JSAMPROW) source->iobuffer;
|
||||
source->pub.buffer = & source->pixrow;
|
||||
source->pub.buffer_height = 1;
|
||||
} else {
|
||||
/* Need to translate anyway, so make a separate sample buffer. */
|
||||
source->pub.buffer = (*cinfo->mem->alloc_sarray)
|
||||
((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
(JDIMENSION) w * cinfo->input_components, (JDIMENSION) 1);
|
||||
source->pub.buffer_height = 1;
|
||||
}
|
||||
|
||||
/* Compute the rescaling array if required. */
|
||||
if (need_rescale) {
|
||||
INT32 val, half_maxval;
|
||||
|
||||
/* On 16-bit-int machines we have to be careful of maxval = 65535 */
|
||||
source->rescale = (JSAMPLE *)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
(size_t) (((long) maxval + 1L) * SIZEOF(JSAMPLE)));
|
||||
half_maxval = maxval / 2;
|
||||
for (val = 0; val <= (INT32) maxval; val++) {
|
||||
/* The multiplication here must be done in 32 bits to avoid overflow */
|
||||
source->rescale[val] = (JSAMPLE) ((val*MAXJSAMPLE + half_maxval)/maxval);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Finish up at the end of the file.
|
||||
*/
|
||||
|
||||
METHODDEF(void)
|
||||
finish_input_ppm (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
|
||||
{
|
||||
/* no work */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* The module selection routine for PPM format input.
|
||||
*/
|
||||
|
||||
GLOBAL(cjpeg_source_ptr)
|
||||
jinit_read_ppm (j_compress_ptr cinfo)
|
||||
{
|
||||
ppm_source_ptr source;
|
||||
|
||||
/* Create module interface object */
|
||||
source = (ppm_source_ptr)
|
||||
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
||||
SIZEOF(ppm_source_struct));
|
||||
/* Fill in method ptrs, except get_pixel_rows which start_input sets */
|
||||
source->pub.start_input = start_input_ppm;
|
||||
source->pub.finish_input = finish_input_ppm;
|
||||
|
||||
return (cjpeg_source_ptr) source;
|
||||
}
|
||||
|
||||
#endif /* PPM_SUPPORTED */
|
||||
Reference in New Issue
Block a user