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/*
Copyright (c) 1996-2007 Han The Thanh, <thanh@pdftex.org>
This file is part of pdfTeX.
pdfTeX is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
pdfTeX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with pdfTeX; if not, write to the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
$Id: writejpg.c 114 2007-05-23 18:23:49Z ms $
*/
#include "ptexlib.h"
#include "image.h"
#define JPG_GRAY 1 /* Gray color space, use /DeviceGray */
#define JPG_RGB 3 /* RGB color space, use /DeviceRGB */
#define JPG_CMYK 4 /* CMYK color space, use /DeviceCMYK */
typedef enum { /* JPEG marker codes */
M_SOF0 = 0xc0, /* baseline DCT */
M_SOF1 = 0xc1, /* extended sequential DCT */
M_SOF2 = 0xc2, /* progressive DCT */
M_SOF3 = 0xc3, /* lossless (sequential) */
M_SOF5 = 0xc5, /* differential sequential DCT */
M_SOF6 = 0xc6, /* differential progressive DCT */
M_SOF7 = 0xc7, /* differential lossless */
M_JPG = 0xc8, /* JPEG extensions */
M_SOF9 = 0xc9, /* extended sequential DCT */
M_SOF10 = 0xca, /* progressive DCT */
M_SOF11 = 0xcb, /* lossless (sequential) */
M_SOF13 = 0xcd, /* differential sequential DCT */
M_SOF14 = 0xce, /* differential progressive DCT */
M_SOF15 = 0xcf, /* differential lossless */
M_DHT = 0xc4, /* define Huffman tables */
M_DAC = 0xcc, /* define arithmetic conditioning table */
M_RST0 = 0xd0, /* restart */
M_RST1 = 0xd1, /* restart */
M_RST2 = 0xd2, /* restart */
M_RST3 = 0xd3, /* restart */
M_RST4 = 0xd4, /* restart */
M_RST5 = 0xd5, /* restart */
M_RST6 = 0xd6, /* restart */
M_RST7 = 0xd7, /* restart */
M_SOI = 0xd8, /* start of image */
M_EOI = 0xd9, /* end of image */
M_SOS = 0xda, /* start of scan */
M_DQT = 0xdb, /* define quantization tables */
M_DNL = 0xdc, /* define number of lines */
M_DRI = 0xdd, /* define restart interval */
M_DHP = 0xde, /* define hierarchical progression */
M_EXP = 0xdf, /* expand reference image(s) */
M_APP0 = 0xe0, /* application marker, used for JFIF */
M_APP1 = 0xe1, /* application marker */
M_APP2 = 0xe2, /* application marker */
M_APP3 = 0xe3, /* application marker */
M_APP4 = 0xe4, /* application marker */
M_APP5 = 0xe5, /* application marker */
M_APP6 = 0xe6, /* application marker */
M_APP7 = 0xe7, /* application marker */
M_APP8 = 0xe8, /* application marker */
M_APP9 = 0xe9, /* application marker */
M_APP10 = 0xea, /* application marker */
M_APP11 = 0xeb, /* application marker */
M_APP12 = 0xec, /* application marker */
M_APP13 = 0xed, /* application marker */
M_APP14 = 0xee, /* application marker, used by Adobe */
M_APP15 = 0xef, /* application marker */
M_JPG0 = 0xf0, /* reserved for JPEG extensions */
M_JPG13 = 0xfd, /* reserved for JPEG extensions */
M_COM = 0xfe, /* comment */
M_TEM = 0x01, /* temporary use */
M_ERROR = 0x100 /* dummy marker, internal use only */
} JPEG_MARKER;
static JPG_UINT16 read2bytes(FILE * f)
{
int c = xgetc(f);
return (c << 8) + xgetc(f);
}
void read_jpg_info(integer img)
{
int i, units = 0;
unsigned char jpg_id[] = "JFIF";
img_xres(img) = img_yres(img) = 0;
jpg_ptr(img)->file = xfopen(img_name(img), FOPEN_RBIN_MODE);
xfseek(jpg_ptr(img)->file, 0, SEEK_END, cur_file_name);
jpg_ptr(img)->length = xftell(jpg_ptr(img)->file, cur_file_name);
xfseek(jpg_ptr(img)->file, 0, SEEK_SET, cur_file_name);
if (read2bytes(jpg_ptr(img)->file) != 0xFFD8)
pdftex_fail("reading JPEG image failed (no JPEG header found)");
/* currently only true JFIF files allow extracting img_xres and img_yres */
if (read2bytes(jpg_ptr(img)->file) == 0xFFE0) { /* check for JFIF */
(void) read2bytes(jpg_ptr(img)->file);
for (i = 0; i < 5; i++) {
if (xgetc(jpg_ptr(img)->file) != jpg_id[i])
break;
}
if (i == 5) { /* it's JFIF */
read2bytes(jpg_ptr(img)->file);
units = xgetc(jpg_ptr(img)->file);
img_xres(img) = read2bytes(jpg_ptr(img)->file);
img_yres(img) = read2bytes(jpg_ptr(img)->file);
switch (units) {
case 1:
break; /* pixels per inch */
case 2:
img_xres(img) *= 2.54;
img_yres(img) *= 2.54;
break; /* pixels per cm */
default:
img_xres(img) = img_yres(img) = 0;
break;
}
}
}
xfseek(jpg_ptr(img)->file, 0, SEEK_SET, cur_file_name);
while (1) {
if (feof(jpg_ptr(img)->file))
pdftex_fail("reading JPEG image failed (premature file end)");
if (fgetc(jpg_ptr(img)->file) != 0xFF)
pdftex_fail("reading JPEG image failed (no marker found)");
switch (xgetc(jpg_ptr(img)->file)) {
case M_SOF5:
case M_SOF6:
case M_SOF7:
case M_SOF9:
case M_SOF10:
case M_SOF11:
case M_SOF13:
case M_SOF14:
case M_SOF15:
pdftex_fail("unsupported type of compression");
case M_SOF2:
if (fixedpdfminorversion <= 2)
pdftex_fail("cannot use progressive DCT with PDF-1.2");
case M_SOF0:
case M_SOF1:
case M_SOF3:
(void) read2bytes(jpg_ptr(img)->file); /* read segment length */
jpg_ptr(img)->bits_per_component = xgetc(jpg_ptr(img)->file);
img_height(img) = read2bytes(jpg_ptr(img)->file);
img_width(img) = read2bytes(jpg_ptr(img)->file);
jpg_ptr(img)->color_space = xgetc(jpg_ptr(img)->file);
xfseek(jpg_ptr(img)->file, 0, SEEK_SET, cur_file_name);
switch (jpg_ptr(img)->color_space) {
case JPG_GRAY:
img_color(img) = IMAGE_COLOR_B;
break;
case JPG_RGB:
img_color(img) = IMAGE_COLOR_C;
break;
case JPG_CMYK:
img_color(img) = IMAGE_COLOR_C;
break;
default:
pdftex_fail("Unsupported color space %i",
(int) jpg_ptr(img)->color_space);
}
return;
case M_SOI: /* ignore markers without parameters */
case M_EOI:
case M_TEM:
case M_RST0:
case M_RST1:
case M_RST2:
case M_RST3:
case M_RST4:
case M_RST5:
case M_RST6:
case M_RST7:
break;
default: /* skip variable length markers */
xfseek(jpg_ptr(img)->file, read2bytes(jpg_ptr(img)->file) - 2,
SEEK_CUR, cur_file_name);
break;
}
}
}
void write_jpg(integer img)
{
long unsigned l;
FILE *f;
pdf_puts("/Type /XObject\n/Subtype /Image\n");
pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n/Length %i\n",
(int) img_width(img),
(int) img_height(img),
(int) jpg_ptr(img)->bits_per_component,
(int) jpg_ptr(img)->length);
pdf_puts("/ColorSpace ");
if (img_colorspace_ref(img) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace_ref(img));
} else {
switch (jpg_ptr(img)->color_space) {
case JPG_GRAY:
pdf_puts("/DeviceGray\n");
break;
case JPG_RGB:
pdf_puts("/DeviceRGB\n");
break;
case JPG_CMYK:
pdf_puts("/DeviceCMYK\n/Decode [1 0 1 0 1 0 1 0]\n");
break;
default:
pdftex_fail("Unsupported color space %i",
(int) jpg_ptr(img)->color_space);
}
}
pdf_puts("/Filter /DCTDecode\n>>\nstream\n");
for (l = jpg_ptr(img)->length, f = jpg_ptr(img)->file; l > 0; l--)
pdfout(xgetc(f));
pdfendstream();
}
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