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authorKarl Berry <karl@freefriends.org>2006-01-17 21:41:51 +0000
committerKarl Berry <karl@freefriends.org>2006-01-17 21:41:51 +0000
commit487ca4806cc046076293cf6cc5fbba0db282bac7 (patch)
tree847b412ab5158dd7bdd7ed7e5a4cc3fbca94be32 /Build/source/texk/web2c/pdftexdir/writepng.c
parenta3d3111bfe26b8e5f5bc6049dfb2a4ca2edc7881 (diff)
texk 1
git-svn-id: svn://tug.org/texlive/trunk@1485 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/web2c/pdftexdir/writepng.c')
-rw-r--r--Build/source/texk/web2c/pdftexdir/writepng.c593
1 files changed, 593 insertions, 0 deletions
diff --git a/Build/source/texk/web2c/pdftexdir/writepng.c b/Build/source/texk/web2c/pdftexdir/writepng.c
new file mode 100644
index 00000000000..30340c9e08e
--- /dev/null
+++ b/Build/source/texk/web2c/pdftexdir/writepng.c
@@ -0,0 +1,593 @@
+/*
+Copyright (c) 1996-2004 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+$Id: //depot/Build/source.development/TeX/texk/web2c/pdftexdir/writepng.c#8 $
+*/
+
+#include "ptexlib.h"
+#include "image.h"
+
+
+
+static const char perforce_id[] =
+ "$Id: //depot/Build/source.development/TeX/texk/web2c/pdftexdir/writepng.c#8 $";
+
+
+void read_png_info(integer img)
+{
+ double gamma;
+ FILE *png_file = xfopen(img_name(img), FOPEN_RBIN_MODE);
+
+ if ((png_ptr(img) = png_create_read_struct(PNG_LIBPNG_VER_STRING,
+ NULL, NULL, NULL)) == NULL)
+ pdftex_fail("libpng: png_create_read_struct() failed");
+ if ((png_info(img) = png_create_info_struct(png_ptr(img))) == NULL)
+ pdftex_fail("libpng: png_create_info_struct() failed");
+ if (setjmp(png_ptr(img)->jmpbuf))
+ pdftex_fail("libpng: internal error");
+ png_init_io(png_ptr(img), png_file);
+ png_read_info(png_ptr(img), png_info(img));
+ /* simple transparency support */
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_tRNS)) {
+ png_set_tRNS_to_alpha(png_ptr(img));
+ }
+ /* alpha channel support */
+ if (fixedpdfminorversion < 4 && png_ptr(img)->color_type | PNG_COLOR_MASK_ALPHA)
+ png_set_strip_alpha(png_ptr(img));
+ /* 16bit depth support */
+ if (fixedpdfminorversion < 5)
+ fixedimagehicolor = 0;
+ if (png_info(img)->bit_depth == 16 && !fixedimagehicolor)
+ png_set_strip_16(png_ptr(img));
+ /* gamma support */
+ if (fixedimageapplygamma) {
+ if(png_get_gAMA(png_ptr(img), png_info(img), &gamma))
+ png_set_gamma(png_ptr(img), (fixedgamma / 1000.0), gamma);
+ else
+ png_set_gamma(png_ptr(img), (fixedgamma / 1000.0), (1000.0/ fixedimagegamma ));
+ }
+ /* reset structure */
+ png_read_update_info(png_ptr(img), png_info(img));
+ /* resolution support */
+ img_width(img) = png_info(img)->width;
+ img_height(img) = png_info(img)->height;
+ if (png_info(img)->valid & PNG_INFO_pHYs) {
+ img_xres(img) =
+ round(0.0254*png_get_x_pixels_per_meter(png_ptr(img), png_info(img)));
+ img_yres(img) =
+ round(0.0254*png_get_y_pixels_per_meter(png_ptr(img), png_info(img)));
+ }
+ switch (png_info(img)->color_type) {
+ case PNG_COLOR_TYPE_PALETTE:
+ img_color(img) = IMAGE_COLOR_C | IMAGE_COLOR_I;
+ break;
+ case PNG_COLOR_TYPE_GRAY:
+ case PNG_COLOR_TYPE_GRAY_ALPHA:
+ img_color(img) = IMAGE_COLOR_B;
+ break;
+ case PNG_COLOR_TYPE_RGB:
+ case PNG_COLOR_TYPE_RGB_ALPHA:
+ img_color(img) = IMAGE_COLOR_C;
+ break;
+ default:
+ pdftex_fail("unsupported type of color_type <%i>", png_info(img)->color_type);
+ }
+}
+
+
+#define write_gray_pixel_16(r) \
+ if (j % 4 == 0||j % 4 == 1) pdfbuf[pdfptr++] = *r++; \
+ else smask[smask_ptr++] = *r++
+
+#define write_gray_pixel_8(r) \
+ if (j % 2 == 0) pdfbuf[pdfptr++] = *r++; \
+ else smask[smask_ptr++] = *r++
+
+
+#define write_rgb_pixel_16(r) \
+ if (!(j % 8 == 6||j % 8 == 7)) pdfbuf[pdfptr++] = *r++; \
+ else smask[smask_ptr++] = *r++
+
+#define write_rgb_pixel_8(r) \
+ if (j % 4 != 3) pdfbuf[pdfptr++] = *r++; \
+ else smask[smask_ptr++] = *r++
+
+#define write_simple_pixel(r) pdfbuf[pdfptr++] = *r++
+
+
+#define write_noninterlaced(outmac) \
+ for (i = 0; i < (int)png_info(img)->height; i++) { \
+ png_read_row(png_ptr(img), row, NULL); \
+ r = row; \
+ k = png_info(img)->rowbytes; \
+ while(k > 0) { \
+ l = (k > pdfbufsize)? pdfbufsize : k; \
+ pdfroom(l); \
+ for (j = 0; j < l; j++) { \
+ outmac; \
+ } \
+ k -= l; \
+ } \
+ }
+
+#define write_interlaced(outmac) \
+ for (i = 0; i < (int)png_info(img)->height; i++) { \
+ row = rows[i]; \
+ k = png_info(img)->rowbytes; \
+ while(k > 0) { \
+ l = (k > pdfbufsize)? pdfbufsize : k; \
+ pdfroom(l); \
+ for (j = 0; j < l; j++) { \
+ outmac; \
+ } \
+ k -= l; \
+ } \
+ xfree(rows[i]); \
+ }
+
+
+void write_png_palette (integer img)
+{
+ int i, j, k, l;
+ png_bytep row, r, *rows;
+ integer palette_objnum = 0;
+ pdfcreateobj(0, 0);
+ palette_objnum = objptr;
+ if (img_colorspace_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int)img_colorspace_ref(img));
+ }
+ else {
+ pdf_printf("[/Indexed /DeviceRGB %i %i 0 R]\n",
+ (int)(png_info(img)->num_palette - 1),
+ (int)palette_objnum);
+ }
+ pdfbeginstream();
+ if (png_info(img)->interlace_type == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_info(img)->rowbytes, png_byte);
+ write_noninterlaced(write_simple_pixel(r));
+ xfree(row);
+ } else {
+ if (png_info(img)->height*png_info(img)->rowbytes >= 10240000L)
+ pdftex_warn("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_info(img)->height, png_bytep);
+ for (i = 0; i < png_info(img)->height; i++)
+ rows[i] = xtalloc(png_info(img)->rowbytes, png_byte);
+ png_read_image(png_ptr(img), rows);
+ write_interlaced(write_simple_pixel(row));
+ xfree(rows);
+ }
+ pdfendstream();
+ if (palette_objnum > 0) {
+ pdfbegindict(palette_objnum);
+ pdfbeginstream();
+ for (i = 0; i < png_info(img)->num_palette; i++) {
+ pdfroom(3);
+ pdfbuf[pdfptr++] = png_info(img)->palette[i].red;
+ pdfbuf[pdfptr++] = png_info(img)->palette[i].green;
+ pdfbuf[pdfptr++] = png_info(img)->palette[i].blue;
+ }
+ pdfendstream();
+ }
+}
+
+void write_png_gray (integer img)
+{
+ int i, j, k, l;
+ png_bytep row, r, *rows;
+ if (img_colorspace_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int)img_colorspace_ref(img));
+ }
+ else {
+ pdf_puts("/DeviceGray\n");
+ }
+ pdfbeginstream();
+ if (png_info(img)->interlace_type == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_info(img)->rowbytes, png_byte);
+ write_noninterlaced(write_simple_pixel(r));
+ xfree(row);
+ } else {
+ if (png_info(img)->height*png_info(img)->rowbytes >= 10240000L)
+ pdftex_warn("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_info(img)->height, png_bytep);
+ for (i = 0; i < png_info(img)->height; i++)
+ rows[i] = xtalloc(png_info(img)->rowbytes, png_byte);
+ png_read_image(png_ptr(img), rows);
+ write_interlaced(write_simple_pixel(row));
+ xfree(rows);
+ }
+ pdfendstream();
+}
+
+
+
+void write_png_gray_alpha (integer img)
+{
+ int i, j, k, l;
+ 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_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int)img_colorspace_ref(img));
+ }
+ else {
+ pdf_puts("/DeviceGray\n");
+ }
+ pdfcreateobj(0, 0);
+ smask_objnum = objptr;
+ pdf_printf("/SMask %i 0 R\n",
+ (int)smask_objnum);
+ smask_size = (png_info(img)->rowbytes/2)*png_info(img)->height;
+ smask = xtalloc(smask_size, png_byte);
+ pdfbeginstream();
+ if (png_info(img)->interlace_type == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_info(img)->rowbytes, png_byte);
+ if ((png_info(img)->bit_depth == 16) && fixedimagehicolor) {
+ write_noninterlaced(write_gray_pixel_16(r));
+ } else {
+ write_noninterlaced(write_gray_pixel_8(r));
+ }
+ xfree(row);
+ } else {
+ if (png_info(img)->height*png_info(img)->rowbytes >= 10240000L)
+ pdftex_warn("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_info(img)->height, png_bytep);
+ for (i = 0; i < png_info(img)->height; i++)
+ rows[i] = xtalloc(png_info(img)->rowbytes, png_byte);
+ png_read_image(png_ptr(img), rows);
+ if ((png_info(img)->bit_depth == 16) && fixedimagehicolor) {
+ write_interlaced(write_gray_pixel_16(row));
+ } else {
+ write_interlaced(write_gray_pixel_8(row));
+ }
+ xfree(rows);
+ }
+ pdfendstream();
+ pdfflush();
+ /* now write the Smask object */
+ if (smask_objnum > 0) {
+ bitdepth = (int)png_info(img)->bit_depth;
+ pdfbegindict(smask_objnum);
+ pdf_puts("/Type /XObject\n/Subtype /Image\n");
+ pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
+ (int)png_info(img)->width,
+ (int)png_info(img)->height,
+ (bitdepth == 16 ? 8 : bitdepth));
+ pdf_puts("/ColorSpace /DeviceGray\n");
+ pdfbeginstream();
+ for (i = 0; i <smask_size; i++) {
+ if (i % 8 == 0)
+ pdfroom(8);
+ pdfbuf[pdfptr++] = smask[i];
+ if (bitdepth == 16)
+ i++;
+ }
+ xfree(smask);
+ pdfendstream();
+ }
+}
+
+void write_png_rgb (integer img)
+{
+ int i, j, k, l;
+ png_bytep row, r, *rows;
+ if (img_colorspace_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int)img_colorspace_ref(img));
+ }
+ else {
+ pdf_puts("/DeviceRGB\n");
+ }
+ pdfbeginstream();
+ if (png_info(img)->interlace_type == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_info(img)->rowbytes, png_byte);
+ write_noninterlaced(write_simple_pixel(r));
+ xfree(row);
+ } else {
+ if (png_info(img)->height*png_info(img)->rowbytes >= 10240000L)
+ pdftex_warn("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_info(img)->height, png_bytep);
+ for (i = 0; i < png_info(img)->height; i++)
+ rows[i] = xtalloc(png_info(img)->rowbytes, png_byte);
+ png_read_image(png_ptr(img), rows);
+ write_interlaced(write_simple_pixel(row));
+ xfree(rows);
+ }
+ pdfendstream();
+}
+
+void write_png_rgb_alpha (integer img)
+{
+ int i, j, k, l;
+ 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_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int)img_colorspace_ref(img));
+ }
+ else {
+ pdf_puts("/DeviceRGB\n");
+ }
+ pdfcreateobj(0, 0);
+ smask_objnum = objptr;
+ pdf_printf("/SMask %i 0 R\n",
+ (int)smask_objnum);
+ smask_size = (png_info(img)->rowbytes/2)*png_info(img)->height;
+ smask = xtalloc(smask_size, png_byte);
+ pdfbeginstream();
+ if (png_info(img)->interlace_type == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_info(img)->rowbytes, png_byte);
+ if ((png_info(img)->bit_depth == 16) && fixedimagehicolor) {
+ write_noninterlaced(write_rgb_pixel_16(r));
+ } else {
+ write_noninterlaced(write_rgb_pixel_8(r));
+ }
+ xfree(row);
+ } else {
+ if (png_info(img)->height*png_info(img)->rowbytes >= 10240000L)
+ pdftex_warn("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_info(img)->height, png_bytep);
+ for (i = 0; i < png_info(img)->height; i++)
+ rows[i] = xtalloc(png_info(img)->rowbytes, png_byte);
+ png_read_image(png_ptr(img), rows);
+ if ((png_info(img)->bit_depth == 16) && fixedimagehicolor) {
+ write_interlaced(write_rgb_pixel_16(row));
+ } else {
+ write_interlaced(write_rgb_pixel_8(row));
+ }
+ xfree(rows);
+ }
+ pdfendstream();
+ pdfflush();
+ /* now write the Smask object */
+ if (smask_objnum > 0) {
+ bitdepth = (int)png_info(img)->bit_depth;
+ pdfbegindict(smask_objnum);
+ pdf_puts("/Type /XObject\n/Subtype /Image\n");
+ pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
+ (int)png_info(img)->width,
+ (int)png_info(img)->height,
+ (bitdepth == 16 ? 8 : bitdepth));
+ pdf_puts("/ColorSpace /DeviceGray\n");
+ pdfbeginstream();
+ for (i = 0; i <smask_size; i++) {
+ if (i % 8 == 0)
+ pdfroom(8);
+ pdfbuf[pdfptr++] = smask[i];
+ if (bitdepth == 16)
+ i++;
+ }
+ xfree(smask);
+ pdfendstream();
+ }
+}
+
+
+/**********************************************************************/
+/*
+ *
+ * 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
+
+void copy_png(integer img)
+{
+ FILE *fp = png_ptr(img)->io_ptr;
+ int i, len, type, streamlength = 0;
+ boolean endflag = false;
+ int idat = 0; /* flag to check continuous IDAT chunks sequence */
+ /* 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", streamlength);
+ pdf_printf("/Filter /FlateDecode\n");
+ pdf_printf("/DecodeParms << ");
+ pdf_printf("/Colors %d ", png_info(img)->color_type == 2 ? 3 : 1);
+ pdf_printf("/Columns %d ", (int) png_info(img)->width);
+ pdf_printf("/BitsPerComponent %i ", (int) png_info(img)->bit_depth);
+ pdf_printf("/Predictor %d ", 10); /* actual predictor defined on line basis */
+ pdf_printf(">>\n>>\nstream\n");
+ /* 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 > pdfbufsize) ? pdfbufsize : len;
+ pdfroom(i);
+ fread(&pdfbuf[pdfptr], 1, i, fp);
+ pdfptr += 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_puts("\nendstream\nendobj\n");
+ 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);
+}
+
+void write_png (integer img)
+{
+
+ double gamma, checked_gamma;
+ int i;
+ integer palette_objnum = 0;
+ if (fixedpdfminorversion < 5)
+ fixedimagehicolor = 0;
+
+ pdf_puts("/Type /XObject\n/Subtype /Image\n");
+ pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
+ (int)png_info(img)->width,
+ (int)png_info(img)->height,
+ (int)png_info(img)->bit_depth);
+ pdf_puts("/ColorSpace ");
+ checked_gamma = 1.0;
+ if (fixedimageapplygamma) {
+ if(png_get_gAMA(png_ptr(img), png_info(img), &gamma)) {
+ checked_gamma = (fixedgamma / 1000.0) * gamma;
+ } else {
+ checked_gamma = (fixedgamma / 1000.0) * (1000.0/ fixedimagegamma );
+ }
+ }
+ /* the switching between |png_info| and |png_ptr| queries has been trial and error.
+ */
+ if (fixedpdfminorversion > 1
+ && png_info(img)->interlace_type == PNG_INTERLACE_NONE
+ && (png_ptr(img)->transformations == 0 ||
+ png_ptr(img)->transformations == 0x2000 ) /* gamma */
+ && !(png_ptr(img)->color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+ png_ptr(img)->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ && (fixedimagehicolor || (png_ptr(img)->bit_depth <= 8))
+ && (checked_gamma <= 1.01 && checked_gamma > 0.99)
+ )
+ {
+ if (img_colorspace_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int)img_colorspace_ref(img));
+ }
+ else {
+ switch (png_info(img)->color_type) {
+ case PNG_COLOR_TYPE_PALETTE:
+ pdfcreateobj(0, 0);
+ palette_objnum = objptr;
+ pdf_printf("[/Indexed /DeviceRGB %i %i 0 R]\n",
+ (int) (png_info(img)->num_palette - 1),
+ (int) palette_objnum);
+ break;
+ case PNG_COLOR_TYPE_GRAY:
+ pdf_puts("/DeviceGray\n");
+ break;
+ default: /* RGB */
+ pdf_puts("/DeviceRGB\n");
+ };
+ }
+ tex_printf(" (PNG copy)");
+ copy_png(img);
+ if (palette_objnum > 0) {
+ pdfbegindict(palette_objnum);
+ pdfbeginstream();
+ for (i = 0; i < png_info(img)->num_palette; i++) {
+ pdfroom(3);
+ pdfbuf[pdfptr++] = png_info(img)->palette[i].red;
+ pdfbuf[pdfptr++] = png_info(img)->palette[i].green;
+ pdfbuf[pdfptr++] = png_info(img)->palette[i].blue;
+ }
+ pdfendstream();
+ }
+ } else {
+ if (0) {
+ tex_printf(" PNG copy skipped because: ");
+ if(fixedimageapplygamma &&
+ (checked_gamma > 1.01 || checked_gamma < 0.99))
+ tex_printf("gamma delta=%lf ", checked_gamma);
+ if (png_ptr(img)->transformations != PNG_TRANSFORM_IDENTITY)
+ tex_printf("transform=%d",png_ptr(img)->transformations);
+ if ((png_info(img)->color_type != PNG_COLOR_TYPE_GRAY) &&
+ (png_info(img)->color_type != PNG_COLOR_TYPE_RGB) &&
+ (png_info(img)->color_type != PNG_COLOR_TYPE_PALETTE))
+ tex_printf("colortype ");
+ if (fixedpdfminorversion <= 1)
+ tex_printf("version=%d ",fixedpdfminorversion);
+ if (png_info(img)->interlace_type != PNG_INTERLACE_NONE)
+ tex_printf("interlaced ");
+ if (png_info(img)->bit_depth > 8)
+ tex_printf("bitdepth=%d ",png_info(img)->bit_depth);
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_tRNS))
+ tex_printf("simple transparancy ");
+ }
+ switch (png_info(img)->color_type) {
+ case PNG_COLOR_TYPE_PALETTE:
+ write_png_palette(img);
+ break;
+ case PNG_COLOR_TYPE_GRAY:
+ write_png_gray(img);
+ break;
+ case PNG_COLOR_TYPE_GRAY_ALPHA:
+ if (fixedpdfminorversion >=4)
+ write_png_gray_alpha(img);
+ else
+ write_png_gray(img);
+ break;
+ case PNG_COLOR_TYPE_RGB:
+ write_png_rgb(img);
+ break;
+ case PNG_COLOR_TYPE_RGB_ALPHA:
+ if (fixedpdfminorversion >=4)
+ write_png_rgb_alpha(img);
+ else
+ write_png_rgb(img);
+ break;
+ default:
+ pdftex_fail("unsupported type of color_type <%i>", png_info(img)->color_type);
+ }
+ }
+ pdfflush();
+}
+
+