Release-1.2.14-20020224

1 files changed, 157 insertions, 0 deletions

diff --git a/src/pngenc.cpp b/src/pngenc.cpp
new file mode 100644
index 0000000..438b4b5
--- /dev/null
+++ b/src/pngenc.cpp
@@ -0,0 +1,157 @@
+/******************************************************************************
+ *
+ * 
+ *
+ *
+ * Copyright (C) 1997-2001 by Dimitri van Heesch.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation under the terms of the GNU General Public License is hereby 
+ * granted. No representations are made about the suitability of this software 
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ * See the GNU General Public License for more details.
+ *
+ * Documents produced by Doxygen are derivative works derived from the
+ * input used in their production; they are not affected by this license.
+ *
+ * ---------------------------------------------------------------------------
+ *
+ * The Portable Network Graphic format is an ISO Standard.
+ * Most of the code below was donated by Bernhard Ristow.
+ */
+
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
+#include <png.h>
+#include <stdio.h>
+#include <malloc.h>
+#include "pngenc.h"
+#include "message.h"
+
+static void user_error_fn(png_structp, png_const_charp error_msg)
+{
+    err("%s\n", error_msg);
+}
+
+static void user_warning_fn(png_structp, png_const_charp warning_msg)
+{
+    err("%s\n", warning_msg);
+}
+
+PngEncoder::PngEncoder(Byte *rawBytes, Color *p, int w, int h, Byte d, int t) : 
+     data(rawBytes), palette(p), width(w), height(h), depth(d), transIndex(t)
+{
+   numPixels = w*h;
+   dataPtr   = data;
+}
+
+PngEncoder::~PngEncoder()
+{
+}
+
+void PngEncoder::write(const char *name)
+{
+   FILE           * file               = NULL;
+   unsigned char ** rows               = 0;
+   unsigned char  * cmap               = 0;
+   short            numOfColors        = (1<<depth);
+   short            bit_depth          = 4;
+   long             i                  = 0;
+   long             j                  = 0;
+   png_structp      png_ptr;
+   png_infop        info_ptr;
+   char             user_error_ptr[]   = "PngEncoder";
+   png_colorp       png_palette;
+   png_byte         ti[1];
+
+   png_ptr = png_create_write_struct
+             ( PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
+               user_error_fn, user_warning_fn);
+   if (!png_ptr) 
+   {
+      err("Can not allocate writing structure!\n");
+      return;
+   }
+
+   info_ptr = png_create_info_struct(png_ptr);
+   if (!info_ptr) 
+   {
+      png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+      err("Can not allocate writing structure!\n");
+      return;
+   }
+
+   if (setjmp(png_jmpbuf(png_ptr))) 
+   {
+     png_destroy_write_struct(&png_ptr, &info_ptr);
+     return;
+   }
+   else
+   {
+     png_palette = (png_colorp) png_malloc(png_ptr,
+         PNG_MAX_PALETTE_LENGTH*sizeof(png_color));
+     memset(png_palette,0,PNG_MAX_PALETTE_LENGTH*sizeof(png_color));
+     for (i=0; i<numOfColors; i++) 
+     {
+       png_palette[i].red   = palette[i].red;
+       png_palette[i].green = palette[i].green;
+       png_palette[i].blue  = palette[i].blue;
+     }
+     png_set_PLTE(png_ptr, info_ptr, png_palette, PNG_MAX_PALETTE_LENGTH);
+     png_set_IHDR( png_ptr, info_ptr, width, height, bit_depth,
+         PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
+         PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE
+                 );
+     ti[0] = transIndex;
+     png_set_tRNS(png_ptr,info_ptr,ti,1,NULL);
+     rows    = (unsigned char **) calloc(sizeof(unsigned char*),height);
+     rows[0] = (unsigned char  *) calloc(sizeof(unsigned char),height*width);
+     for (i=1; i<height; i++) 
+     {
+       rows[i] = rows[i-1] + width;
+     }
+     for (i=0, dataPtr=data; i<height; i++) 
+     {
+       for (j=0; j<width; j++) 
+       {
+         if (j%2)
+         {
+           rows[i][j/2] = ( rows[i][j/2] | *dataPtr );
+         }
+         else
+         {
+           rows[i][j/2] = (*dataPtr) << 4;
+         }
+         dataPtr++;
+       }
+     }
+     png_set_rows(png_ptr,info_ptr,rows);
+
+     file = fopen(name,"wb");
+     png_init_io(png_ptr,file);
+     png_write_png(png_ptr,info_ptr,PNG_TRANSFORM_IDENTITY,NULL);
+   }
+
+   png_destroy_write_struct(&png_ptr, &info_ptr);
+
+   if (file)
+   {
+      fclose (file);
+   }
+   if (cmap)
+   {
+      free(cmap);
+   }
+   if (rows) 
+   {
+      if (rows[0])
+      {
+         free(rows[0]);
+      }
+      free(rows);
+   }
+   return;
+}
+