src/lib/vGif.c 1.5

1.5 2009/08/19 22:28:36 angie
Added option to mgSaveToGif and its call stack, to use GIF's Graphic Control Extension to make memgfx's background color (0) transparent. Also corrected terminology for PNG in .h files: useAlpha -> useTransparency.

Index: src/lib/vGif.c
===================================================================
RCS file: /projects/compbio/cvsroot/kent/src/lib/vGif.c,v
retrieving revision 1.4
retrieving revision 1.5
diff -b -B -U 4 -r1.4 -r1.5
--- src/lib/vGif.c	6 May 2003 07:33:44 -0000	1.4
+++ src/lib/vGif.c	19 Aug 2009 22:28:36 -0000	1.5
@@ -13,8 +13,9 @@
 /* Something that handles a gif. */
     {
     struct memGfx mg;	/* Memory form.  This needs to be first field. */
     char *fileName;	/* Gif file name. */
+    boolean useTransparency;
     };
 
 void memGifClose(struct memGif **pG)
 /* Write out and close and free. */
@@ -22,16 +23,16 @@
 struct memGif *g = *pG;
 if (g != NULL)
     {
     struct memGfx *mg = (struct memGfx *)g;
-    mgSaveGif(mg, g->fileName);
+    mgSaveGif(mg, g->fileName, g->useTransparency);
     freez(&g->fileName);
     mgFree(&mg);
     *pG = NULL;
     }
 }
 
-struct vGfx *vgOpenGif(int width, int height, char *fileName)
+struct vGfx *vgOpenGif(int width, int height, char *fileName, boolean useTransparency)
 /* Open up something that will someday be a PostScript file. */
 {
 struct memGif *gif;
 struct memGfx *mg;
@@ -45,8 +46,9 @@
 /* Get our mg + fileName structure.  We're forcing
  * inheritence from mg essentially. */
 AllocVar(gif);
 gif->fileName = cloneString(fileName);
+gif->useTransparency = useTransparency;
 
 /* Fill in the mg part of this structure with normal memGfx. */
 mg = mgNew(width, height);
 mgClearPixels(mg);