gentoo-overlay/media-gfx/zgv/files/zgv-5.9-cmyk-yccl-fix.diff

--- a/src/readjpeg.c	Sun Oct 31 14:54:26 2004
+++ b/src/readjpeg.c	Wed Sep 21 21:03:22 2005
@@ -92,11 +92,13 @@
 	int *real_width,int *real_height)
 {
 static FILE *in;
+static int cmyk;
 struct my_error_mgr jerr;
 int row_stride;		/* physical row width in output buffer */
 int tmp,f;
-unsigned char *ptr;
+unsigned char *ptr,*ptr2;
 
+cmyk=0;
 use_errmsg=0;
 theimage=NULL;
 howfar=howfarfunc;
@@ -161,6 +163,15 @@
     pal[f]=pal[256+f]=pal[512+f]=f;
   }
 
+if(cinfo.jpeg_color_space==JCS_CMYK)
+  cmyk=1;
+
+if(cinfo.jpeg_color_space==JCS_YCCK)
+  {
+  cmyk=1;
+  cinfo.out_color_space=JCS_CMYK;
+  }
+  
 width=cinfo.image_width;
 height=cinfo.image_height;
 
@@ -191,7 +202,7 @@
   }
 
 if(WH_BAD(width,height) ||
-   (theimage=(byte *)malloc(pixelsize*width*height))==NULL)
+   (theimage=(byte *)malloc(pixelsize*width*(height+cmyk)))==NULL)
   {
   jpegerr("Out of memory");	/* XXX misleading if width/height are bad */
   longjmp(jerr.setjmp_buffer,1);
@@ -222,7 +233,20 @@
   while(cinfo.output_scanline<height)
     {
     jpeg_read_scanlines(&cinfo,&ptr,1);
-    for(f=0;f<width;f++) { tmp=*ptr; *ptr=ptr[2]; ptr[2]=tmp; ptr+=3; }
+    if(!cmyk)
+      for(f=0;f<width;f++) { tmp=*ptr; *ptr=ptr[2]; ptr[2]=tmp; ptr+=3; }
+    else
+      {
+      ptr2=ptr;
+      for(f=0;f<width;f++,ptr+=3,ptr2+=4)
+        {
+        tmp=ptr2[3];
+        ptr[0]=(tmp*ptr2[2])/255;
+        ptr[1]=(tmp*ptr2[1])/255;
+        ptr[2]=(tmp*ptr2[0])/255;
+        }
+      }
+    
     if(howfar!=NULL) howfar(cinfo.output_scanline,height);
     }