1 files changed, 106 insertions, 0 deletions
diff --git a/mpng.c b/mpng.c
new file mode 100644
index 0000000000..8794215941
--- /dev/null
+++ b/mpng.c
@@ -0,0 +1,106 @@
+
+#include <stdlib.h>
+
+#include "config.h"
+#include "bswap.h"
+#include "postproc/rgb2rgb.h"
+#include "mp_msg.h"
+#include "png.h"
+
+int    pngPointer;
+
+void pngReadFN( png_structp pngstr,png_bytep buffer,png_size_t size )
+{
+ char * p = pngstr->io_ptr;
+ memcpy( buffer,(char *)&p[pngPointer],size );
+ pngPointer+=size;
+}
+
+void decode_mpng(
+  unsigned char *encoded,
+  int encoded_size,
+  unsigned char *decoded,
+  int width,
+  int height,
+  int bytes_per_pixel)
+{
+ png_structp     png;
+ png_infop       info;
+ png_infop       endinfo;
+ png_bytep       data;
+ png_bytep     * row_p;
+ png_uint_32     png_width,png_height;
+ char	       * palette = NULL;
+ int             depth,color;
+ png_uint_32     i;
+ png=png_create_read_struct( PNG_LIBPNG_VER_STRING,NULL,NULL,NULL );
+ info=png_create_info_struct( png );
+ endinfo=png_create_info_struct( png );
+
+ pngPointer=8;
+ png_set_read_fn( png,encoded,pngReadFN );
+ png_set_sig_bytes( png,8 );
+ png_read_info( png,info );
+ png_get_IHDR( png,info,&png_width,&png_height,&depth,&color,NULL,NULL,NULL );
+
+ png_set_bgr( png );
+
+#if 0
+ switch( info->color_type )
+  {
+   case PNG_COLOR_TYPE_GRAY_ALPHA: printf( "[png] used GrayA -> stripping alpha channel\n" ); break;
+   case PNG_COLOR_TYPE_GRAY:       printf( "[png] used Gray -> rgb\n" ); break;
+   case PNG_COLOR_TYPE_PALETTE:    printf( "[png] used palette -> rgb\n" ); break;
+   case PNG_COLOR_TYPE_RGB_ALPHA:  printf( "[png] used RGBA -> stripping alpha channel\n" ); break;
+   case PNG_COLOR_TYPE_RGB:        printf( "[png] read rgb datas.\n" ); break;
+  }
+#endif
+
+ if ( info->color_type == PNG_COLOR_TYPE_RGB ) data=decoded;
+  else data=(png_bytep)malloc( png_get_rowbytes( png,info ) * height );
+
+ row_p=(png_bytep*)malloc( sizeof( png_bytep ) * png_height );
+ for ( i=0; i < png_height; i++ ) row_p[i]=&data[png_get_rowbytes( png,info ) * i];
+ png_read_image( png,row_p );
+ free( row_p );
+						     
+ switch( info->color_type )
+  {
+   case PNG_COLOR_TYPE_GRAY_ALPHA:
+          mp_msg( MSGT_DECVIDEO,MSGL_INFO,"Sorry gray scaled png with alpha channel not supported at moment.\n" );
+          free( data );
+	  break;
+   case PNG_COLOR_TYPE_GRAY:
+          palette=malloc( 1024 );
+          for ( i=0;i < 256;i++ ) palette[(i*4)]=palette[(i*4)+1]=palette[(i*4)+2]=(char)i;
+	  palette8torgb24( data,decoded,png_width * png_height,palette );
+          free( data );
+	  break;
+   case PNG_COLOR_TYPE_PALETTE:
+          { 
+           int    cols;
+	   unsigned char * pal;
+           png_get_PLTE( png,info,(png_colorp*)&pal,&cols ); 
+           palette=calloc( 1,1024 );
+	   for ( i=0;i < cols;i++ )
+	    {
+	     palette[(i*4)  ]=pal[(i*3)+2];
+	     palette[(i*4)+1]=pal[(i*3)+1];
+	     palette[(i*4)+2]=pal[(i*3)  ];
+	    }
+	  }
+	  palette8torgb24( data,decoded,png_width * png_height,palette );
+          free( data );
+	  break;
+   case PNG_COLOR_TYPE_RGB_ALPHA:
+          rgb32to24( data,decoded,png_width * png_height * 4 );
+          free( data );
+	  break;
+  }
+
+ if ( palette ) free( palette );
+
+ png_read_end( png,endinfo );
+ png_destroy_read_struct( &png,&info,&endinfo );
+}
+