st/wgl: Implement wglUseFontBitmaps.

wglUseFontBitmaps is currently a noop.
This patch implements this function for Windows.
Misc code clean-ups by Brian.

Signed-off-by: Olivier Lauffenburger <o.lauffenburger@topsolid.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/state_trackers/wgl/stw_wgl.c

@@ -214,14 +214,7 @@ wglUseFontBitmapsA(
    DWORD count,
    DWORD listBase )
 {
-   (void) hdc;
-   (void) first;
-   (void) count;
-   (void) listBase;
-
-   assert( 0 );
-
-   return FALSE;
+   return wglUseFontBitmapsW(hdc, first, count, listBase);
 }
 
 WINGDIAPI BOOL APIENTRY
@@ -240,14 +233,54 @@ wglUseFontBitmapsW(
    DWORD count,
    DWORD listBase )
 {
-   (void) hdc;
-   (void) first;
-   (void) count;
-   (void) listBase;
+   GLYPHMETRICS gm;
+   MAT2 tra;
+   FIXED one, minus_one, zero;
+   void *buffer = NULL;
+   BOOL result = TRUE;
 
-   assert( 0 );
+   one.value = 1;
+   one.fract = 0;
+   minus_one.value = -1;
+   minus_one.fract = 0;
+   zero.value = 0;
+   zero.fract = 0;
 
-   return FALSE;
+   tra.eM11 = one;
+   tra.eM22 = minus_one;
+   tra.eM12 = tra.eM21 = zero;
+
+   for (int i = 0; i < count; i++) {
+      DWORD size = GetGlyphOutline(hdc, first + i, GGO_BITMAP, &gm, 0,
+                                   NULL, &tra);
+
+      glNewList(listBase + i, GL_COMPILE);
+
+      if (size != GDI_ERROR) {
+         if (size == 0) {
+            glBitmap(0, 0, -gm.gmptGlyphOrigin.x, gm.gmptGlyphOrigin.y,
+                     gm.gmCellIncX, gm.gmCellIncY, NULL);
+         }
+         else {
+            buffer = realloc(buffer, size);
+            size = GetGlyphOutline(hdc, first + i, GGO_BITMAP, &gm,
+                                   size, buffer, &tra);
+
+            glBitmap(gm.gmBlackBoxX, gm.gmBlackBoxY,
+                     -gm.gmptGlyphOrigin.x, gm.gmptGlyphOrigin.y,
+                     gm.gmCellIncX, gm.gmCellIncY, buffer);
+         }
+      }
+      else {
+         result = FALSE;
+      }
+
+      glEndList();
+   }
+
+   free(buffer);
+
+   return result;
 }
 
 WINGDIAPI BOOL APIENTRY