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authorKarl Berry <karl@freefriends.org>2021-02-25 19:22:25 +0000
committerKarl Berry <karl@freefriends.org>2021-02-25 19:22:25 +0000
commitad547a6b5986815fda458221149728d9d9ab1d87 (patch)
tree16296910eb3eca724371474ea9aea3994dc69614 /Build/source/texk/web2c/pdftexdir/writepng.c
parent947b43de3dd21d58ccc2ffadefc4441ea1c2a813 (diff)
restore Build,TODO from r57911
git-svn-id: svn://tug.org/texlive/trunk@57915 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/web2c/pdftexdir/writepng.c')
-rw-r--r--Build/source/texk/web2c/pdftexdir/writepng.c675
1 files changed, 675 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..5079fc3f3d3
--- /dev/null
+++ b/Build/source/texk/web2c/pdftexdir/writepng.c
@@ -0,0 +1,675 @@
+/*
+Copyright 1996-2017 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 this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ptexlib.h"
+#include "image.h"
+
+static int transparent_page_group = 0;
+
+static void warn(png_structp png_ptr, png_const_charp msg)
+{
+ (void)png_ptr; (void)msg; /* Make compiler happy */
+}
+
+void read_png_info(integer img)
+{
+ FILE *png_file = xfopen(img_name(img), FOPEN_RBIN_MODE);
+
+ if ((png_ptr(img) = png_create_read_struct(PNG_LIBPNG_VER_STRING,
+ NULL, NULL, warn)) == 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_jmpbuf(png_ptr(img))))
+ pdftex_fail("libpng: internal error");
+#if PNG_LIBPNG_VER >= 10603
+ /* ignore possibly incorrect CMF bytes */
+ png_set_option(png_ptr(img), PNG_MAXIMUM_INFLATE_WINDOW, PNG_OPTION_ON);
+#endif
+ png_init_io(png_ptr(img), png_file);
+ png_read_info(png_ptr(img), png_info(img));
+ /* resolution support */
+ img_width(img) = png_get_image_width(png_ptr(img), png_info(img));
+ img_height(img) = png_get_image_height(png_ptr(img), png_info(img));
+ if (png_get_valid(png_ptr(img), png_info(img), 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_get_color_type(png_ptr(img), png_info(img))) {
+ 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_get_color_type(png_ptr(img), png_info(img)));
+ }
+ if ((fixedpdfmajorversion > 1 || fixedpdfminorversion >= 4)
+ && (png_get_color_type(png_ptr(img), png_info(img)) == PNG_COLOR_TYPE_GRAY_ALPHA
+ || png_get_color_type(png_ptr(img), png_info(img)) == PNG_COLOR_TYPE_RGB_ALPHA)) {
+ /* png with alpha channel in device colours; we have to add a Page
+ * Group to make Adobe happy, so we have to create a dummy group object
+ */
+ if (transparent_page_group == 0) {
+ transparent_page_group = pdfnewobjnum();
+ }
+ if (pdfpagegroupval == 0) {
+ pdfpagegroupval = transparent_page_group;
+ }
+ img_group_ref(img) = pdfpagegroupval;
+ }
+}
+
+
+#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_get_image_height(png_ptr(img), png_info(img)); i++) { \
+ png_read_row(png_ptr(img), row, NULL); \
+ r = row; \
+ k = png_get_rowbytes(png_ptr(img), png_info(img)); \
+ 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_get_image_height(png_ptr(img), png_info(img)); i++) { \
+ row = rows[i]; \
+ k = png_get_rowbytes(png_ptr(img), png_info(img)); \
+ while(k > 0) { \
+ l = (k > pdfbufsize)? pdfbufsize : k; \
+ pdfroom(l); \
+ for (j = 0; j < l; j++) { \
+ outmac; \
+ } \
+ k -= l; \
+ } \
+ xfree(rows[i]); \
+ }
+
+
+static void write_png_palette(integer img)
+{
+ int i, j, k, l;
+ png_bytep row, r, *rows;
+ integer palette_objnum = 0;
+ png_colorp palette;
+ int num_palette;
+
+ png_get_PLTE(png_ptr(img), png_info(img), &palette, &num_palette);
+
+ 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",
+ num_palette -1, (int) palette_objnum);
+ }
+ pdfbeginstream();
+ if (png_get_interlace_type(png_ptr(img), png_info(img)) == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ write_noninterlaced(write_simple_pixel(r));
+ xfree(row);
+ } else {
+ if (png_get_image_height(png_ptr(img), png_info(img))
+ * png_get_rowbytes(png_ptr(img), png_info(img)) >= 10240000L)
+ pdftex_warn
+ ("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_get_image_height(png_ptr(img), png_info(img)), png_bytep);
+ for (i = 0; (unsigned) i < png_get_image_height(png_ptr(img), png_info(img)); i++)
+ rows[i] = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), 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, 0);
+ pdfbeginstream();
+ for (i = 0; (unsigned) i < num_palette; i++) {
+ pdfroom(3);
+ pdfbuf[pdfptr++] = palette[i].red;
+ pdfbuf[pdfptr++] = palette[i].green;
+ pdfbuf[pdfptr++] = palette[i].blue;
+ }
+ pdfendstream();
+ }
+}
+
+static 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_get_interlace_type(png_ptr(img), png_info(img)) == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ write_noninterlaced(write_simple_pixel(r));
+ xfree(row);
+ } else {
+ if (png_get_image_height(png_ptr(img), png_info(img))
+ * png_get_rowbytes(png_ptr(img), png_info(img)) >= 10240000L)
+ pdftex_warn
+ ("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_get_image_height(png_ptr(img), png_info(img)), png_bytep);
+ for (i = 0; (unsigned) i < png_get_image_height(png_ptr(img), png_info(img)); i++)
+ rows[i] = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ png_read_image(png_ptr(img), rows);
+ write_interlaced(write_simple_pixel(row));
+ xfree(rows);
+ }
+ pdfendstream();
+}
+
+
+
+static 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_get_rowbytes(png_ptr(img), png_info(img)) / 2)
+ * png_get_image_height(png_ptr(img), png_info(img));
+ smask = xtalloc(smask_size, png_byte);
+ pdfbeginstream();
+ if (png_get_interlace_type(png_ptr(img), png_info(img)) == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ if ((png_get_bit_depth(png_ptr(img), png_info(img)) == 16) && fixedimagehicolor) {
+ write_noninterlaced(write_gray_pixel_16(r));
+ } else {
+ write_noninterlaced(write_gray_pixel_8(r));
+ }
+ xfree(row);
+ } else {
+ if (png_get_image_height(png_ptr(img), png_info(img))
+ * png_get_rowbytes(png_ptr(img), png_info(img)) >= 10240000L)
+ pdftex_warn
+ ("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_get_image_height(png_ptr(img), png_info(img)), png_bytep);
+ for (i = 0; (unsigned) i < png_get_image_height(png_ptr(img), png_info(img)); i++)
+ rows[i] = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ png_read_image(png_ptr(img), rows);
+ if ((png_get_bit_depth(png_ptr(img), png_info(img)) == 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_get_bit_depth(png_ptr(img), png_info(img));
+ pdfbegindict(smask_objnum, 0);
+ pdf_puts("/Type /XObject\n/Subtype /Image\n");
+ pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
+ (int) png_get_image_width(png_ptr(img), png_info(img)),
+ (int) png_get_image_height(png_ptr(img), png_info(img)),
+ (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();
+ }
+}
+
+static 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_get_interlace_type(png_ptr(img), png_info(img)) == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ write_noninterlaced(write_simple_pixel(r));
+ xfree(row);
+ } else {
+ if (png_get_image_height(png_ptr(img), png_info(img))
+ * png_get_rowbytes(png_ptr(img), png_info(img)) >= 10240000L)
+ pdftex_warn
+ ("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_get_image_height(png_ptr(img), png_info(img)), png_bytep);
+ for (i = 0; (unsigned) i < png_get_image_height(png_ptr(img), png_info(img)); i++)
+ rows[i] = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ png_read_image(png_ptr(img), rows);
+ write_interlaced(write_simple_pixel(row));
+ xfree(rows);
+ }
+ pdfendstream();
+}
+
+static 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_get_rowbytes(png_ptr(img), png_info(img)) / 4)
+ * png_get_image_height(png_ptr(img), png_info(img));
+ smask = xtalloc(smask_size, png_byte);
+ pdfbeginstream();
+ if (png_get_interlace_type(png_ptr(img), png_info(img)) == PNG_INTERLACE_NONE) {
+ row = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ if ((png_get_bit_depth(png_ptr(img), png_info(img)) == 16) && fixedimagehicolor) {
+ write_noninterlaced(write_rgb_pixel_16(r));
+ } else {
+ write_noninterlaced(write_rgb_pixel_8(r));
+ }
+ xfree(row);
+ } else {
+ if (png_get_image_height(png_ptr(img), png_info(img))
+ * png_get_rowbytes(png_ptr(img), png_info(img)) >= 10240000L)
+ pdftex_warn
+ ("large interlaced PNG might cause out of memory (use non-interlaced PNG to fix this)");
+ rows = xtalloc(png_get_image_height(png_ptr(img), png_info(img)), png_bytep);
+ for (i = 0; (unsigned) i < png_get_image_height(png_ptr(img), png_info(img)); i++)
+ rows[i] = xtalloc(png_get_rowbytes(png_ptr(img), png_info(img)), png_byte);
+ png_read_image(png_ptr(img), rows);
+ if ((png_get_bit_depth(png_ptr(img), png_info(img)) == 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_get_bit_depth(png_ptr(img), png_info(img));
+ pdfbegindict(smask_objnum, 0);
+ pdf_puts("/Type /XObject\n/Subtype /Image\n");
+ pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
+ (int) png_get_image_width(png_ptr(img), png_info(img)),
+ (int) png_get_image_height(png_ptr(img), png_info(img)),
+ (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
+
+static void copy_png(integer img)
+{
+ FILE *fp = (FILE *) png_get_io_ptr(png_ptr(img));
+ 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"
+ "/Filter/FlateDecode\n"
+ "/DecodeParms<<"
+ "/Colors %d"
+ "/Columns %d"
+ "/BitsPerComponent %i"
+ "/Predictor 10>>\n>>\nstream\n", streamlength,
+ png_get_color_type(png_ptr(img), png_info(img)) == 2 ? 3 : 1,
+ (int) png_get_image_width(png_ptr(img), png_info(img)),
+ (int) png_get_bit_depth(png_ptr(img), png_info(img)));
+ /* 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 */
+ pdfendstream();
+ 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 boolean last_png_needs_page_group;
+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 */
+static void write_additional_png_objects(void)
+{
+ if (last_png_needs_page_group) {
+ if (!transparent_page_group_was_written && transparent_page_group > 0) {
+ // create new group object
+ transparent_page_group_was_written = true;
+ pdfbeginobj(transparent_page_group, 2);
+ if (getpdfcompresslevel() == 0) {
+ pdf_puts("%PTEX Group needed for transparent pngs\n");
+ }
+ pdf_puts("<</Type/Group /S/Transparency /CS/DeviceRGB /I true>>\n");
+ pdfendobj();
+ }
+ }
+}
+
+void write_png(integer img)
+{
+
+ boolean png_copy = true;
+ double gamma = 0.0;
+ png_fixed_point int_file_gamma = 0;
+#ifndef PNG_FP_1
+ /* for libpng < 1.5.0 */
+#define PNG_FP_1 100000
+#endif
+ int i;
+ integer palette_objnum = 0;
+ png_colorp palette;
+ int num_palette;
+ last_png_needs_page_group = false;
+
+ png_get_PLTE(png_ptr(img), png_info(img), &palette, &num_palette);
+
+ if (fixedpdfmajorversion == 1 && fixedpdfminorversion < 5)
+ fixedimagehicolor = 0;
+
+ pdf_puts("/Type /XObject\n/Subtype /Image\n");
+ /* simple transparency support */
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_tRNS)) {
+ png_set_tRNS_to_alpha(png_ptr(img));
+ png_copy = false;
+ }
+ /* alpha channel support */
+ if (fixedpdfmajorversion == 1 && fixedpdfminorversion < 4
+ && png_get_color_type(png_ptr(img), png_info(img)) | PNG_COLOR_MASK_ALPHA) {
+ png_set_strip_alpha(png_ptr(img));
+ png_copy = false;
+ }
+ /* 16 bit depth support */
+ if (fixedpdfmajorversion == 1 && fixedpdfminorversion < 5)
+ fixedimagehicolor = 0;
+ if ((png_get_bit_depth(png_ptr(img), png_info(img)) == 16) && (fixedimagehicolor == 0)) {
+ png_set_strip_16(png_ptr(img));
+ png_copy = false;
+ }
+ /* gamma support */
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_gAMA)) {
+ png_get_gAMA(png_ptr(img), png_info(img), &gamma);
+ png_get_gAMA_fixed(png_ptr(img), png_info(img), &int_file_gamma);
+ }
+ if (fixedimageapplygamma) {
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_gAMA))
+ png_set_gamma(png_ptr(img), fixedgamma / 1000.0, gamma);
+ else
+ png_set_gamma(png_ptr(img), fixedgamma / 1000.0,
+ 1000.0 / fixedimagegamma);
+ png_copy = false;
+ }
+ /* reset structure */
+ (void) png_set_interlace_handling(png_ptr(img));
+ png_read_update_info(png_ptr(img), png_info(img));
+
+ pdf_printf("/Width %i\n/Height %i\n/BitsPerComponent %i\n",
+ (int) png_get_image_width(png_ptr(img), png_info(img)),
+ (int) png_get_image_height(png_ptr(img), png_info(img)),
+ (int) png_get_bit_depth(png_ptr(img), png_info(img)));
+ pdf_puts("/ColorSpace ");
+ if (png_copy && (fixedpdfmajorversion > 1 || fixedpdfminorversion > 1)
+ && png_get_interlace_type(png_ptr(img), png_info(img)) == PNG_INTERLACE_NONE
+ && (png_get_color_type(png_ptr(img), png_info(img)) == PNG_COLOR_TYPE_GRAY
+ || png_get_color_type(png_ptr(img), png_info(img)) == PNG_COLOR_TYPE_RGB)
+ && !fixedimageapplygamma
+ && (!png_get_valid(png_ptr(img), png_info(img), PNG_INFO_gAMA)
+ || int_file_gamma == PNG_FP_1)
+ && !png_get_valid(png_ptr(img), png_info(img),
+ PNG_INFO_cHRM | PNG_INFO_iCCP | PNG_INFO_sBIT | PNG_INFO_sRGB
+ | PNG_INFO_bKGD | PNG_INFO_hIST | PNG_INFO_tRNS | PNG_INFO_sPLT)
+ ) {
+ /* Copy PNG */
+ if (img_colorspace_ref(img) != 0) {
+ pdf_printf("%i 0 R\n", (int) img_colorspace_ref(img));
+ } else {
+ switch (png_get_color_type(png_ptr(img), png_info(img))) {
+ case PNG_COLOR_TYPE_PALETTE:
+ pdfcreateobj(0, 0);
+ palette_objnum = objptr;
+ pdf_printf("[/Indexed /DeviceRGB %i %i 0 R]\n",
+ 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, 0);
+ pdfbeginstream();
+ for (i = 0; i < num_palette; i++) {
+ pdfroom(3);
+ pdfbuf[pdfptr++] = palette[i].red;
+ pdfbuf[pdfptr++] = palette[i].green;
+ pdfbuf[pdfptr++] = palette[i].blue;
+ }
+ pdfendstream();
+ }
+ } else {
+ if (0) {
+ tex_printf(" *** PNG copy skipped because:");
+ if (!png_copy)
+ tex_printf(" !png_copy");
+ if (fixedpdfmajorversion == 1 && fixedpdfminorversion <= 1)
+ tex_printf(" minorversion=%d (and majorversion=1)",
+ (int) fixedpdfminorversion);
+ if (png_get_interlace_type(png_ptr(img), png_info(img)) != PNG_INTERLACE_NONE)
+ tex_printf(" interlaced");
+ if (!((png_get_color_type(png_ptr(img), png_info(img)) == PNG_COLOR_TYPE_GRAY)
+ || (png_get_color_type(png_ptr(img), png_info(img)) == PNG_COLOR_TYPE_RGB)))
+ tex_printf(" colortype");
+ if (fixedimageapplygamma)
+ tex_printf(" apply gamma");
+ if (!(!png_get_valid(png_ptr(img), png_info(img), PNG_INFO_gAMA)
+ || int_file_gamma == PNG_FP_1))
+ tex_printf(" gamma");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_cHRM))
+ tex_printf(" cHRM");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_iCCP))
+ tex_printf(" iCCP");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_sBIT))
+ tex_printf(" sBIT");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_sRGB))
+ tex_printf(" sRGB");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_bKGD))
+ tex_printf(" bKGD");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_hIST))
+ tex_printf(" hIST");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_tRNS))
+ tex_printf(" tRNS");
+ if (png_get_valid(png_ptr(img), png_info(img), PNG_INFO_sPLT))
+ tex_printf(" sPLT");
+ }
+ switch (png_get_color_type(png_ptr(img), png_info(img))) {
+ 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 || fixedpdfmajorversion > 1) {
+ write_png_gray_alpha(img);
+ last_png_needs_page_group = true;
+ } 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 || fixedpdfmajorversion > 1) {
+ write_png_rgb_alpha(img);
+ last_png_needs_page_group = true;
+ } else
+ write_png_rgb(img);
+ break;
+ default:
+ pdftex_fail("unsupported type of color_type <%i>",
+ png_get_color_type(png_ptr(img), png_info(img)));
+ }
+ }
+ pdfflush();
+ write_additional_png_objects();
+}