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|
/* writepng.c
Copyright 1996-2006 Han The Thanh <thanh@pdftex.org>
Copyright 2006-2009 Taco Hoekwater <taco@luatex.org>
This file is part of LuaTeX.
LuaTeX 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.
LuaTeX 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 Lesser General Public
License for more details.
You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
#include <assert.h>
#include "ptexlib.h"
#include "image.h"
#include "writepng.h"
static const char _svn_version[] =
"$Id: writepng.c 2317 2009-04-18 00:12:18Z hhenkel $ "
"$URL: http://foundry.supelec.fr/svn/luatex/tags/beta-0.40.6/source/texk/web2c/luatexdir/image/writepng.c $";
static int transparent_page_group = -1;
static void close_and_cleanup_png(image_dict * idict)
{
assert(idict != NULL);
assert(img_file(idict) != NULL);
assert(img_filepath(idict) != NULL);
xfclose(img_file(idict), img_filepath(idict));
img_file(idict) = NULL;
assert(img_png_ptr(idict) != NULL);
png_destroy_read_struct(&(img_png_png_ptr(idict)),
&(img_png_info_ptr(idict)), NULL);
xfree(img_png_ptr(idict));
img_png_ptr(idict) = NULL;
}
void read_png_info(image_dict * idict, img_readtype_e readtype)
{
double gamma;
png_structp png_p;
png_infop info_p;
assert(idict != NULL);
assert(img_type(idict) == IMG_TYPE_PNG);
img_totalpages(idict) = 1;
img_pagenum(idict) = 1;
img_xres(idict) = img_yres(idict) = 0;
assert(img_file(idict) == NULL);
img_file(idict) = xfopen(img_filepath(idict), FOPEN_RBIN_MODE);
assert(img_png_ptr(idict) == NULL);
img_png_ptr(idict) = xtalloc(1, png_img_struct);
if ((png_p = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL)) == NULL)
pdftex_fail("libpng: png_create_read_struct() failed");
img_png_png_ptr(idict) = png_p;
if ((info_p = png_create_info_struct(png_p)) == NULL)
pdftex_fail("libpng: png_create_info_struct() failed");
img_png_info_ptr(idict) = info_p;
if (setjmp(png_p->jmpbuf))
pdftex_fail("libpng: internal error");
png_init_io(png_p, img_file(idict));
png_read_info(png_p, info_p);
/* simple transparency support */
if (png_get_valid(png_p, info_p, PNG_INFO_tRNS)) {
png_set_tRNS_to_alpha(png_p);
}
/* alpha channel support */
if (fixed_pdf_minor_version < 4 && png_p->color_type | PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_p);
/* 16bit depth support */
if (fixed_pdf_minor_version < 5)
fixed_image_hicolor = 0;
if (info_p->bit_depth == 16 && !fixed_image_hicolor)
png_set_strip_16(png_p);
/* gamma support */
if (fixed_image_apply_gamma) {
if (png_get_gAMA(png_p, info_p, &gamma))
png_set_gamma(png_p, (fixed_gamma / 1000.0), gamma);
else
png_set_gamma(png_p, (fixed_gamma / 1000.0),
(1000.0 / fixed_image_gamma));
}
/* reset structure */
png_read_update_info(png_p, info_p);
/* resolution support */
img_xsize(idict) = info_p->width;
img_ysize(idict) = info_p->height;
if (info_p->valid & PNG_INFO_pHYs) {
img_xres(idict) =
round(0.0254 * png_get_x_pixels_per_meter(png_p, info_p));
img_yres(idict) =
round(0.0254 * png_get_y_pixels_per_meter(png_p, info_p));
}
switch (info_p->color_type) {
case PNG_COLOR_TYPE_PALETTE:
img_color(idict) = IMAGE_COLOR_C | IMAGE_COLOR_I;
break;
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_GRAY_ALPHA:
img_color(idict) = IMAGE_COLOR_B;
break;
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_RGB_ALPHA:
img_color(idict) = IMAGE_COLOR_C;
break;
default:
pdftex_fail("unsupported type of color_type <%i>", info_p->color_type);
}
img_colordepth(idict) = info_p->bit_depth;
if (readtype == IMG_CLOSEINBETWEEN)
close_and_cleanup_png(idict);
}
#define write_gray_pixel_16(r) \
if (j % 4 == 0||j % 4 == 1) pdf_buf[pdf_ptr++] = *r++; \
else smask[smask_ptr++] = *r++
#define write_gray_pixel_8(r) \
if (j % 2 == 0) pdf_buf[pdf_ptr++] = *r++; \
else smask[smask_ptr++] = *r++
#define write_rgb_pixel_16(r) \
if (!(j % 8 == 6||j % 8 == 7)) pdf_buf[pdf_ptr++] = *r++; \
else smask[smask_ptr++] = *r++
#define write_rgb_pixel_8(r) \
if (j % 4 != 3) pdf_buf[pdf_ptr++] = *r++; \
else smask[smask_ptr++] = *r++
#define write_simple_pixel(r) pdf_buf[pdf_ptr++] = *r++
#define write_noninterlaced(outmac) \
for (i = 0; i < (int)info_p->height; i++) { \
png_read_row(png_p, row, NULL); \
r = row; \
k = info_p->rowbytes; \
while(k > 0) { \
l = (k > pdf_buf_size)? pdf_buf_size : k; \
pdfroom(l); \
for (j = 0; j < l; j++) { \
outmac; \
} \
k -= l; \
} \
}
#define write_interlaced(outmac) \
for (i = 0; i < (int)info_p->height; i++) { \
row = rows[i]; \
k = info_p->rowbytes; \
while(k > 0) { \
l = (k > pdf_buf_size)? pdf_buf_size : k;\
pdfroom(l); \
for (j = 0; j < l; j++) { \
outmac; \
} \
k -= l; \
} \
xfree(rows[i]); \
}
static void write_png_palette(image_dict * idict)
{
int i, j, k, l;
png_structp png_p = img_png_png_ptr(idict);
png_infop info_p = img_png_info_ptr(idict);
png_bytep row, r, *rows;
integer palette_objnum = 0;
if (img_colorspace(idict) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace(idict));
} else {
pdf_create_obj(0, 0);
palette_objnum = obj_ptr;
pdf_printf("[/Indexed /DeviceRGB %i %i 0 R]\n",
(int) (info_p->num_palette - 1), (int) palette_objnum);
}
pdf_begin_stream();
if (info_p->interlace_type == PNG_INTERLACE_NONE) {
row = xtalloc(info_p->rowbytes, png_byte);
write_noninterlaced(write_simple_pixel(r));
xfree(row);
} else {
if (info_p->height * info_p->rowbytes >= 10240000L)
pdftex_warn
("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
rows = xtalloc(info_p->height, png_bytep);
for (i = 0; (unsigned) i < info_p->height; i++)
rows[i] = xtalloc(info_p->rowbytes, png_byte);
png_read_image(png_p, rows);
write_interlaced(write_simple_pixel(row));
xfree(rows);
}
pdf_end_stream();
if (palette_objnum > 0) {
pdf_begin_dict(palette_objnum, 0);
pdf_begin_stream();
for (i = 0; (unsigned) i < info_p->num_palette; i++) {
pdfroom(3);
pdf_buf[pdf_ptr++] = info_p->palette[i].red;
pdf_buf[pdf_ptr++] = info_p->palette[i].green;
pdf_buf[pdf_ptr++] = info_p->palette[i].blue;
}
pdf_end_stream();
}
}
static void write_png_gray(image_dict * idict)
{
int i, j, k, l;
png_structp png_p = img_png_png_ptr(idict);
png_infop info_p = img_png_info_ptr(idict);
png_bytep row, r, *rows;
if (img_colorspace(idict) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace(idict));
} else {
pdf_puts("/DeviceGray\n");
}
pdf_begin_stream();
if (info_p->interlace_type == PNG_INTERLACE_NONE) {
row = xtalloc(info_p->rowbytes, png_byte);
write_noninterlaced(write_simple_pixel(r));
xfree(row);
} else {
if (info_p->height * info_p->rowbytes >= 10240000L)
pdftex_warn
("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
rows = xtalloc(info_p->height, png_bytep);
for (i = 0; (unsigned) i < info_p->height; i++)
rows[i] = xtalloc(info_p->rowbytes, png_byte);
png_read_image(png_p, rows);
write_interlaced(write_simple_pixel(row));
xfree(rows);
}
pdf_end_stream();
}
static void write_png_gray_alpha(image_dict * idict)
{
int i, j, k, l;
png_structp png_p = img_png_png_ptr(idict);
png_infop info_p = img_png_info_ptr(idict);
png_bytep row, r, *rows;
integer smask_objnum = 0;
png_bytep smask;
integer smask_ptr = 0;
integer smask_size = 0;
int bitdepth;
if (img_colorspace(idict) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace(idict));
} else {
pdf_puts("/DeviceGray\n");
}
pdf_create_obj(0, 0);
smask_objnum = obj_ptr;
pdf_printf("/SMask %i 0 R\n", (int) smask_objnum);
smask_size = (info_p->rowbytes / 2) * info_p->height;
smask = xtalloc(smask_size, png_byte);
pdf_begin_stream();
if (info_p->interlace_type == PNG_INTERLACE_NONE) {
row = xtalloc(info_p->rowbytes, png_byte);
if ((info_p->bit_depth == 16) && fixed_image_hicolor) {
write_noninterlaced(write_gray_pixel_16(r));
} else {
write_noninterlaced(write_gray_pixel_8(r));
}
xfree(row);
} else {
if (info_p->height * info_p->rowbytes >= 10240000L)
pdftex_warn
("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
rows = xtalloc(info_p->height, png_bytep);
for (i = 0; (unsigned) i < info_p->height; i++)
rows[i] = xtalloc(info_p->rowbytes, png_byte);
png_read_image(png_p, rows);
if ((info_p->bit_depth == 16) && fixed_image_hicolor) {
write_interlaced(write_gray_pixel_16(row));
} else {
write_interlaced(write_gray_pixel_8(row));
}
xfree(rows);
}
pdf_end_stream();
pdf_flush();
/* now write the Smask object */
bitdepth = (int) info_p->bit_depth;
pdf_begin_dict(smask_objnum, 0);
pdf_puts("/Type /XObject\n/Subtype /Image\n");
if (img_attr(idict) != NULL && strlen(img_attr(idict)) > 0)
pdf_printf("%s\n", img_attr(idict));
pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
(int) info_p->width,
(int) info_p->height, (bitdepth == 16 ? 8 : bitdepth));
pdf_puts("/ColorSpace /DeviceGray\n");
pdf_begin_stream();
for (i = 0; i < smask_size; i++) {
if (i % 8 == 0)
pdfroom(8);
pdf_buf[pdf_ptr++] = smask[i];
if (bitdepth == 16)
i++;
}
pdf_end_stream();
xfree(smask);
}
static void write_png_rgb(image_dict * idict)
{
int i, j, k, l;
png_structp png_p = img_png_png_ptr(idict);
png_infop info_p = img_png_info_ptr(idict);
png_bytep row, r, *rows;
if (img_colorspace(idict) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace(idict));
} else {
pdf_puts("/DeviceRGB\n");
}
pdf_begin_stream();
if (info_p->interlace_type == PNG_INTERLACE_NONE) {
row = xtalloc(info_p->rowbytes, png_byte);
write_noninterlaced(write_simple_pixel(r));
xfree(row);
} else {
if (info_p->height * info_p->rowbytes >= 10240000L)
pdftex_warn
("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
rows = xtalloc(info_p->height, png_bytep);
for (i = 0; (unsigned) i < info_p->height; i++)
rows[i] = xtalloc(info_p->rowbytes, png_byte);
png_read_image(png_p, rows);
write_interlaced(write_simple_pixel(row));
xfree(rows);
}
pdf_end_stream();
}
static void write_png_rgb_alpha(image_dict * idict)
{
int i, j, k, l;
png_structp png_p = img_png_png_ptr(idict);
png_infop info_p = img_png_info_ptr(idict);
png_bytep row, r, *rows;
integer smask_objnum = 0;
png_bytep smask;
integer smask_ptr = 0;
integer smask_size = 0;
int bitdepth;
if (img_colorspace(idict) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace(idict));
} else {
pdf_puts("/DeviceRGB\n");
}
pdf_create_obj(0, 0);
smask_objnum = obj_ptr;
pdf_printf("/SMask %i 0 R\n", (int) smask_objnum);
smask_size = (info_p->rowbytes / 2) * info_p->height;
smask = xtalloc(smask_size, png_byte);
pdf_begin_stream();
if (info_p->interlace_type == PNG_INTERLACE_NONE) {
row = xtalloc(info_p->rowbytes, png_byte);
if ((info_p->bit_depth == 16) && fixed_image_hicolor) {
write_noninterlaced(write_rgb_pixel_16(r));
} else {
write_noninterlaced(write_rgb_pixel_8(r));
}
xfree(row);
} else {
if (info_p->height * info_p->rowbytes >= 10240000L)
pdftex_warn
("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
rows = xtalloc(info_p->height, png_bytep);
for (i = 0; (unsigned) i < info_p->height; i++)
rows[i] = xtalloc(info_p->rowbytes, png_byte);
png_read_image(png_p, rows);
if ((info_p->bit_depth == 16) && fixed_image_hicolor) {
write_interlaced(write_rgb_pixel_16(row));
} else {
write_interlaced(write_rgb_pixel_8(row));
}
xfree(rows);
}
pdf_end_stream();
pdf_flush();
/* now write the Smask object */
if (smask_objnum > 0) {
bitdepth = (int) info_p->bit_depth;
pdf_begin_dict(smask_objnum, 0);
pdf_puts("/Type /XObject\n/Subtype /Image\n");
if (img_attr(idict) != NULL && strlen(img_attr(idict)) > 0)
pdf_printf("%s\n", img_attr(idict));
pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
(int) info_p->width,
(int) info_p->height, (bitdepth == 16 ? 8 : bitdepth));
pdf_puts("/ColorSpace /DeviceGray\n");
pdf_begin_stream();
for (i = 0; i < smask_size; i++) {
if (i % 8 == 0)
pdfroom(8);
pdf_buf[pdf_ptr++] = smask[i];
if (bitdepth == 16)
i++;
}
xfree(smask);
pdf_end_stream();
}
}
/**********************************************************************/
/*
* The |copy_png| function is from Hartmut Henkel. The goal is to use
* pdf's native FlateDecode support if that is possible.
*
* Only a subset of the png files allows this, but when possible it
* greatly improves inclusion speed.
*
* Code cheerfully gleaned from Thomas Merz' PDFlib,
* file p_png.c "SPNG - Simple PNG"
*/
static int spng_getint(FILE * fp)
{
unsigned char buf[4];
if (fread(buf, 1, 4, fp) != 4)
pdftex_fail("writepng: reading chunk type failed");
return ((((((int) buf[0] << 8) + buf[1]) << 8) + buf[2]) << 8) + buf[3];
}
#define SPNG_CHUNK_IDAT 0x49444154
#define SPNG_CHUNK_IEND 0x49454E44
static void copy_png(image_dict * idict)
{
png_structp png_p;
png_infop info_p;
FILE *fp;
int i, len, type, streamlength = 0;
boolean endflag = false;
int idat = 0; /* flag to check continuous IDAT chunks sequence */
assert(idict != NULL);
png_p = img_png_png_ptr(idict);
info_p = img_png_info_ptr(idict);
fp = (FILE *) png_p->io_ptr;
/* 1st pass to find overall stream /Length */
if (fseek(fp, 8, SEEK_SET) != 0)
pdftex_fail("writepng: fseek in PNG file failed");
do {
len = spng_getint(fp);
type = spng_getint(fp);
switch (type) {
case SPNG_CHUNK_IEND:
endflag = true;
break;
case SPNG_CHUNK_IDAT:
streamlength += len;
default:
if (fseek(fp, len + 4, SEEK_CUR) != 0)
pdftex_fail("writepng: fseek in PNG file failed");
}
} while (endflag == false);
pdf_printf("/Length %d\n"
"/Filter/FlateDecode\n"
"/DecodeParms<<"
"/Colors %d"
"/Columns %d"
"/BitsPerComponent %i"
"/Predictor 10>>\n>>\nstream\n", streamlength,
info_p->color_type == 2 ? 3 : 1,
(int) info_p->width, info_p->bit_depth);
/* 2nd pass to copy data */
endflag = false;
if (fseek(fp, 8, SEEK_SET) != 0)
pdftex_fail("writepng: fseek in PNG file failed");
do {
len = spng_getint(fp);
type = spng_getint(fp);
switch (type) {
case SPNG_CHUNK_IDAT: /* do copy */
if (idat == 2)
pdftex_fail("writepng: IDAT chunk sequence broken");
idat = 1;
while (len > 0) {
i = (len > pdf_buf_size) ? pdf_buf_size : len;
pdfroom(i);
fread(&pdf_buf[pdf_ptr], 1, i, fp);
pdf_ptr += i;
len -= i;
}
if (fseek(fp, 4, SEEK_CUR) != 0)
pdftex_fail("writepng: fseek in PNG file failed");
break;
case SPNG_CHUNK_IEND: /* done */
pdf_end_stream();
endflag = true;
break;
default:
if (idat == 1)
idat = 2;
if (fseek(fp, len + 4, SEEK_CUR) != 0)
pdftex_fail("writepng: fseek in PNG file failed");
}
} while (endflag == false);
}
static void reopen_png(image_dict * idict)
{
integer width, height, xres, yres;
width = img_xsize(idict); /* do consistency check */
height = img_ysize(idict);
xres = img_xres(idict);
yres = img_yres(idict);
read_png_info(idict, IMG_KEEPOPEN);
if (width != img_xsize(idict) || height != img_ysize(idict)
|| xres != img_xres(idict) || yres != img_yres(idict))
pdftex_fail("writepng: image dimensions have changed");
}
static boolean last_png_needs_page_group;
void write_png(image_dict * idict)
{
double gamma, checked_gamma;
int i;
integer palette_objnum = 0;
png_structp png_p;
png_infop info_p;
assert(idict != NULL);
last_png_needs_page_group = false;
if (img_file(idict) == NULL)
reopen_png(idict);
assert(img_png_ptr(idict) != NULL);
png_p = img_png_png_ptr(idict);
info_p = img_png_info_ptr(idict);
if (fixed_pdf_minor_version < 5)
fixed_image_hicolor = 0;
pdf_puts("/Type /XObject\n/Subtype /Image\n");
if (img_attr(idict) != NULL && strlen(img_attr(idict)) > 0)
pdf_printf("%s\n", img_attr(idict));
pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
(int) info_p->width,
(int) info_p->height, (int) info_p->bit_depth);
pdf_puts("/ColorSpace ");
checked_gamma = 1.0;
if (fixed_image_apply_gamma) {
if (png_get_gAMA(png_p, info_p, &gamma)) {
checked_gamma = (fixed_gamma / 1000.0) * gamma;
} else {
checked_gamma =
(fixed_gamma / 1000.0) * (1000.0 / fixed_image_gamma);
}
}
/* the switching between |info_p| and |png_p| queries has been trial and error.
*/
if (fixed_pdf_minor_version > 1 && info_p->interlace_type == PNG_INTERLACE_NONE && (png_p->transformations == 0 || png_p->transformations == 0x2000) /* gamma */
&&!(png_p->color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
png_p->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
&& (fixed_image_hicolor || (png_p->bit_depth <= 8))
&& (checked_gamma <= 1.01 && checked_gamma > 0.99)
) {
if (img_colorspace(idict) != 0) {
pdf_printf("%i 0 R\n", (int) img_colorspace(idict));
} else {
switch (info_p->color_type) {
case PNG_COLOR_TYPE_PALETTE:
pdf_create_obj(0, 0);
palette_objnum = obj_ptr;
pdf_printf("[/Indexed /DeviceRGB %i %i 0 R]\n",
(int) (info_p->num_palette - 1),
(int) palette_objnum);
break;
case PNG_COLOR_TYPE_GRAY:
pdf_puts("/DeviceGray\n");
break;
default: /* RGB */
pdf_puts("/DeviceRGB\n");
};
}
if (tracefilenames)
tex_printf(" (PNG copy)");
copy_png(idict);
if (palette_objnum > 0) {
pdf_begin_dict(palette_objnum, 0);
pdf_begin_stream();
for (i = 0; (unsigned) i < info_p->num_palette; i++) {
pdfroom(3);
pdf_buf[pdf_ptr++] = info_p->palette[i].red;
pdf_buf[pdf_ptr++] = info_p->palette[i].green;
pdf_buf[pdf_ptr++] = info_p->palette[i].blue;
}
pdf_end_stream();
}
} else {
if (0) {
tex_printf(" PNG copy skipped because: ");
if (fixed_image_apply_gamma &&
(checked_gamma > 1.01 || checked_gamma < 0.99))
tex_printf("gamma delta=%lf ", checked_gamma);
if (png_p->transformations != PNG_TRANSFORM_IDENTITY)
tex_printf("transform=%lu", (long) png_p->transformations);
if ((info_p->color_type != PNG_COLOR_TYPE_GRAY)
&& (info_p->color_type != PNG_COLOR_TYPE_RGB)
&& (info_p->color_type != PNG_COLOR_TYPE_PALETTE))
tex_printf("colortype ");
if (fixed_pdf_minor_version <= 1)
tex_printf("version=%d ", (int) fixed_pdf_minor_version);
if (info_p->interlace_type != PNG_INTERLACE_NONE)
tex_printf("interlaced ");
if (info_p->bit_depth > 8)
tex_printf("bitdepth=%d ", info_p->bit_depth);
if (png_get_valid(png_p, info_p, PNG_INFO_tRNS))
tex_printf("simple transparancy ");
}
switch (info_p->color_type) {
case PNG_COLOR_TYPE_PALETTE:
write_png_palette(idict);
break;
case PNG_COLOR_TYPE_GRAY:
write_png_gray(idict);
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
if (fixed_pdf_minor_version >= 4) {
write_png_gray_alpha(idict);
last_png_needs_page_group = true;
} else
write_png_gray(idict);
break;
case PNG_COLOR_TYPE_RGB:
write_png_rgb(idict);
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
if (fixed_pdf_minor_version >= 4) {
write_png_rgb_alpha(idict);
last_png_needs_page_group = true;
} else
write_png_rgb(idict);
break;
default:
pdftex_fail("unsupported type of color_type <%i>",
info_p->color_type);
}
}
pdf_flush();
close_and_cleanup_png(idict);
}
static boolean transparent_page_group_was_written = false;
/* Called after the xobject generated by write_png has been finished; used to
* write out additional objects */
void write_additional_png_objects(void)
{
return; /* this interferes with current macro-based usage and cannot be configured */
if (last_png_needs_page_group) {
if (!transparent_page_group_was_written && transparent_page_group > 1) {
/* create new group object */
transparent_page_group_was_written = true;
pdf_begin_obj(transparent_page_group, 2);
if (get_pdf_compress_level() == 0) {
pdf_puts("%PTEX Group needed for transparent pngs\n");
}
pdf_puts
("<</Type/Group /S/Transparency /CS/DeviceRGB /I true /K true>>\n");
pdf_end_obj();
}
}
}
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