--- /dev/null
+From e76a8a537dbf8c47024f5863f9f18ed55ad686d3 Mon Sep 17 00:00:00 2001
+From: michal-n <michal-n@users.sourceforge.net>
+Date: Sat, 17 Dec 2011 15:24:12 +0100
+Subject: [PATCH] There was no need to panic...
+ The patch from Paul contained errant reference to 'png_color16'.
+ The correct form is 'png_color_16'. So, patch reapplied.
+
+---
+ gutils/gimagewritepng.c | 100 +++++++++++++++++++++++-----------------------
+ 1 files changed, 50 insertions(+), 50 deletions(-)
+
+diff --git a/gutils/gimagewritepng.c b/gutils/gimagewritepng.c
+index 43fa097..a88ec63 100644
+--- a/gutils/gimagewritepng.c
++++ b/gutils/gimagewritepng.c
+@@ -236,6 +236,7 @@ return(false);
+ }
+ } else {
+ if ( base->trans!=-1 ) {
++ trans_color = galloc(sizeof(png_color_16));
+ trans_color->red = COLOR_RED(base->trans);
+ trans_color->green = COLOR_GREEN(base->trans);
+ trans_color->blue = COLOR_BLUE(base->trans);
+@@ -258,6 +259,7 @@ return(false);
+ _png_write_end(png_ptr, info_ptr);
+
+ if ( trans_alpha!=NULL ) gfree(trans_alpha);
++ if ( trans_color!=NULL ) gfree(trans_color);
+ if ( palette!=NULL ) gfree(palette);
+ _png_destroy_write_struct(&png_ptr, &info_ptr);
+ gfree(rows);
+@@ -296,7 +298,7 @@ static void user_error_fn(png_structp png_ptr, png_const_charp error_msg) {
+ #if (PNG_LIBPNG_VER < 10500)
+ longjmp(png_ptr->jmpbuf,1);
+ #else
+- _png_longjmp (png_ptr, 1);
++ png_longjmp (png_ptr, 1);
+ #endif
+ }
+
+@@ -310,6 +312,12 @@ int GImageWrite_Png(GImage *gi, FILE *fp, int progressive) {
+ png_infop info_ptr;
+ png_byte **rows;
+ int i;
++ int bit_depth;
++ int color_type;
++ int num_palette;
++ png_bytep trans_alpha = NULL;
++ png_color_16p trans_color = NULL;
++ png_colorp palette = NULL;
+
+ png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+ (void *)NULL, user_error_fn, user_warning_fn);
+@@ -336,65 +344,60 @@ return(false);
+
+ png_init_io(png_ptr, fp);
+
+- info_ptr->width = base->width;
+- info_ptr->height = base->height;
+- info_ptr->bit_depth = 8;
+- info_ptr->valid = 0;
+- info_ptr->interlace_type = progressive;
+- if ( base->trans!=-1 ) {
+- info_ptr->num_trans = 1;
+- info_ptr->valid |= PNG_INFO_tRNS;
++ bit_depth = 8;
++ num_palette = base->clut==NULL?2:base->clut->clut_len;
++ if ( base->image_type==it_index || base->image_type==it_bitmap ) {
++ color_type = PNG_COLOR_TYPE_PALETTE;
++ if ( num_palette<=2 )
++ bit_depth=1;
++ else if ( num_palette<=4 )
++ bit_depth=2;
++ else if ( num_palette<=16 )
++ bit_depth=4;
++ } else {
++ color_type = PNG_COLOR_TYPE_RGB;
++ if ( base->image_type == it_rgba )
++ color_type = PNG_COLOR_TYPE_RGB_ALPHA;
+ }
++
++ png_set_IHDR(png_ptr, info_ptr, base->width, base->height,
++ bit_depth, color_type, progressive,
++ PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+ if ( base->image_type==it_index || base->image_type==it_bitmap ) {
+- info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
+- info_ptr->valid |= PNG_INFO_PLTE;
+- info_ptr->num_palette = base->clut==NULL?2:base->clut->clut_len;
+- info_ptr->palette = (png_color *) galloc(info_ptr->num_palette*sizeof(png_color));
++ palette = (png_color *) galloc(num_palette*sizeof(png_color));
+ if ( base->clut==NULL ) {
+- info_ptr->palette[0].red = info_ptr->palette[0].green = info_ptr->palette[0].blue = 0;
+- info_ptr->palette[1].red = info_ptr->palette[1].green = info_ptr->palette[1].blue = 0xff;
++ palette[0].red = palette[0].green = palette[0].blue = 0;
++ palette[1].red = palette[1].green = palette[1].blue = 0xff;
+ } else {
+- for ( i=0; i<info_ptr->num_palette; ++i ) {
++ for ( i=0; i<num_palette; ++i ) {
+ long col = base->clut->clut[i];
+- info_ptr->palette[i].red = COLOR_RED(col);
+- info_ptr->palette[i].green = COLOR_GREEN(col);
+- info_ptr->palette[i].blue = COLOR_BLUE(col);
++ palette[i].red = COLOR_RED(col);
++ palette[i].green = COLOR_GREEN(col);
++ palette[i].blue = COLOR_BLUE(col);
+ }
+ }
+- if ( info_ptr->num_palette<=2 )
+- info_ptr->bit_depth=1;
+- else if ( info_ptr->num_palette<=4 )
+- info_ptr->bit_depth=2;
+- else if ( info_ptr->num_palette<=16 )
+- info_ptr->bit_depth=4;
+- if ( info_ptr->num_palette<=16 )
++ png_set_PLTE(png_ptr, info_ptr, palette, num_palette);
++ if ( num_palette<=16 )
+ png_set_packing(png_ptr);
++
+ if ( base->trans!=-1 ) {
+-#if ( PNG_LIBPNG_VER_MAJOR > 1 || PNG_LIBPNG_VER_MINOR > 2 )
+- info_ptr->trans_alpha = galloc(1);
+- info_ptr->trans_alpha[0] = base->trans;
+-#else
+- info_ptr->trans = galloc(1);
+- info_ptr->trans[0] = base->trans;
+-#endif
++ trans_alpha = galloc(1);
++ trans_alpha[0] = base->trans;
+ }
+ } else {
+- info_ptr->color_type = PNG_COLOR_TYPE_RGB;
+ if ( base->trans!=-1 ) {
+-#if ( PNG_LIBPNG_VER_MAJOR > 1 || PNG_LIBPNG_VER_MINOR > 2 )
+- info_ptr->trans_color.red = COLOR_RED(base->trans);
+- info_ptr->trans_color.green = COLOR_GREEN(base->trans);
+- info_ptr->trans_color.blue = COLOR_BLUE(base->trans);
+-#else
+- info_ptr->trans_values.red = COLOR_RED(base->trans);
+- info_ptr->trans_values.green = COLOR_GREEN(base->trans);
+- info_ptr->trans_values.blue = COLOR_BLUE(base->trans);
+-#endif
++ trans_color = galloc(sizeof(png_color_16));
++ trans_color->red = COLOR_RED(base->trans);
++ trans_color->green = COLOR_GREEN(base->trans);
++ trans_color->blue = COLOR_BLUE(base->trans);
+ }
+ }
++ if ( base->trans!=-1 ) {
++ png_set_tRNS(png_ptr, info_ptr, trans_alpha, 1, trans_color);
++ }
+ png_write_info(png_ptr, info_ptr);
+
+- if (info_ptr->color_type == PNG_COLOR_TYPE_RGB)
++ if (color_type == PNG_COLOR_TYPE_RGB)
+ png_set_filler(png_ptr, '\0', PNG_FILLER_BEFORE);
+
+ rows = galloc(base->height*sizeof(png_byte *));
+@@ -405,12 +408,9 @@ return(false);
+
+ png_write_end(png_ptr, info_ptr);
+
+-#if ( PNG_LIBPNG_VER_MAJOR > 1 || PNG_LIBPNG_VER_MINOR > 2 )
+- if ( info_ptr->trans_alpha!=NULL ) gfree(info_ptr->trans_alpha);
+-#else
+- if ( info_ptr->trans!=NULL ) gfree(info_ptr->trans);
+-#endif
+- if ( info_ptr->palette!=NULL ) gfree(info_ptr->palette);
++ if ( trans_alpha!=NULL ) gfree(trans_alpha);
++ if ( trans_color!=NULL ) gfree(trans_color);
++ if ( palette!=NULL ) gfree(palette);
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ gfree(rows);
+ return( 1 );
+--
+1.7.4.1
+