q-lang-cvs

[<ag...@us...>]

Update of /cvsroot/q-lang/q/modules/ggi
In directory sc8-pr-cvs1:/tmp/cvs-serv3157

Modified Files:
	ggi.c 
Log Message:
added proper alpha blending to text rendering

Index: ggi.c
===================================================================
RCS file: /cvsroot/q-lang/q/modules/ggi/ggi.c,v
retrieving revision 1.5
retrieving revision 1.6
diff -C2 -d -r1.5 -r1.6
*** ggi.c	20 Dec 2003 02:41:44 -0000	1.5
--- ggi.c	20 Dec 2003 11:51:56 -0000	1.6
***************
*** 1308,1311 ****
--- 1308,1312 ----
    ggi_color fgcol, bgcol, *col = NULL;
    ggi_pixel pix, *pixel = NULL;
+   unsigned fgalpha = 0xff, bgalpha = 0xff;
  
    if (!glyphs) return (l==0);
***************
*** 1377,1391 ****
    dim = wd*ht;
  
!   /* FIXME: handle alpha blending */
! 
!   if (wd > INT_MAX/ht ||
!       !(col = malloc(dim*sizeof(ggi_color))))
      goto errout;
    if (ggiGetGCForeground(vis, &pix) || ggiUnmapPixel(vis, pix, &fgcol))
      goto errout;
!   fgcol.a = 0xffff;
    if (ggiGetGCBackground(vis, &pix) || ggiUnmapPixel(vis, pix, &bgcol))
      goto errout;
!   bgcol.a = 0xffff;
    for (n = 0; n < dim; n++)
      col[n] = bgcol;
--- 1378,1398 ----
    dim = wd*ht;
  
! #ifdef HAVE_GGIBUF
!   if (v->b[0] && ggiBufGetGCForeground(v->b[0], &fgalpha))
      goto errout;
+   if (v->b[0] && ggiBufGetGCBackground(v->b[0], &bgalpha))
+     goto errout;
+ #endif
+   fgalpha *= 0x101;
+   bgalpha *= 0x101;
    if (ggiGetGCForeground(vis, &pix) || ggiUnmapPixel(vis, pix, &fgcol))
      goto errout;
!   fgcol.a = fgalpha;
    if (ggiGetGCBackground(vis, &pix) || ggiUnmapPixel(vis, pix, &bgcol))
      goto errout;
!   bgcol.a = bgalpha;
!   if (wd > INT_MAX/ht ||
!       !(col = malloc(dim*sizeof(ggi_color))))
!     goto errout;
    for (n = 0; n < dim; n++)
      col[n] = bgcol;
***************
*** 1411,1414 ****
--- 1418,1431 ----
  	    int j = q*w+p;
  	    if (buf[j]) {
+ #if 1
+ 	      /* shades of fg color -- I hope that's the right way to do
+ 		 it? */
+ 	      col[i].r = ((long)fgcol.r)*buf[j]/0xff;
+ 	      col[i].g = ((long)fgcol.g)*buf[j]/0xff;
+ 	      col[i].b = ((long)fgcol.b)*buf[j]/0xff;
+ 	      col[i].a = ((long)fgcol.a)*buf[j]/0xff;
+ #else
+ 	      /* blend fg with bg color -- this looks odd with some fg/bg
+ 		 combinations */
  	      col[i].r = (((long)fgcol.r)*buf[j]+
  			  ((long)bgcol.r)*(0xff-buf[j]))/0xff;
***************
*** 1419,1423 ****
--- 1436,1442 ----
  	      col[i].a = (((long)fgcol.a)*buf[j]+
  			  ((long)bgcol.a)*(0xff-buf[j]))/0xff;
+ #endif
  	    }
+ 
  	  }
  	FT_Done_Glyph(image);
***************
*** 1444,1453 ****
    }
  
-   /* clean up */
    free(glyphs);
  
    if (!(pixel = malloc(pack_size(v->vis, dim)))) return 0;
!   error = ggiPackColors(v->vis, pixel, col, dim) ||
!     ggiPutBox(v->vis, x, y, wd, ht, pixel);
    free(col);
    free(pixel);
--- 1463,1492 ----
    }
  
    free(glyphs);
  
+   /* blit the rendered string to the visual */
+ 
    if (!(pixel = malloc(pack_size(v->vis, dim)))) return 0;
!   error = ggiPackColors(v->vis, pixel, col, dim);
!   if (!error) {
! #ifdef HAVE_GGIBUF
!     if (v->b[0]) {
!       /* Ouch! Because of the function call overhead this is fairly slow. We'd
! 	 need something like a ggiBufPutBoxWithAlpha operation here, but
! 	 libggibuf doesn't provide it. :( */
!       int i, j;
!       ggi_bufval val;
!       ggiBufGetGCForeground(v->b[0], &val);
!       for (i = 0; i < wd; i++)
! 	for (j = 0; j < ht; j++) {
! 	  n = j*wd+i;
! 	  ggiBufSetGCForeground(v->b[0], col[n].a/0x101);
! 	  ggiPutPixel(vis, x+i, y+j, pixel[n]);
! 	}
!       ggiBufSetGCForeground(v->b[0], val);
!     } else
! #endif
!       error = ggiPutBox(v->vis, x, y, wd, ht, pixel);
!   }
    free(col);
    free(pixel);