`Activate' gray-scale specifing hinting within the TrueType

ChangeLog

@@ -1,3 +1,24 @@
+2004-08-05  David Turner  <david@freetype.org>
+
+	`Activate' gray-scale specifing hinting within the TrueType
+	bytecode interpreter.  This is an experimental feature which
+	should probably be made optional.
+
+	* src/truetype/ttgload.c (TT_Process_Simple_Glyph,
+	load_truetype_glyph): Move the code to set the pedantic_hinting flag
+	to...
+	(TT_Load_Glyph): Here.
+	Set `grayscale' flag except for `FT_LOAD_TARGET_MONO'.
+
+	* src/truetyep/ttinterp.c (Ins_GETINFO): Return MS rasterizer
+	version 1.7.
+	Return rotation and stretching info only if glyph is rotated or
+	stretched, respectively.
+	Handle grayscale info.
+
+	* src/truetype/ttinterp.h (TT_ExecContextRec): Add `grayscale'
+	member.
+
 2004-08-02  George Williams  <gww@silcom.com>
 
 	* src/base/ftobjs.c (FT_Attach_File): Initialize `open.stream'.

src/truetype/ttgload.c

@@ -818,8 +818,6 @@
           goto Exit;
 
         load->exec->is_composite     = FALSE;
-        load->exec->pedantic_hinting = (FT_Bool)( load->load_flags &
-                                                  FT_LOAD_PEDANTIC );
         load->exec->pts              = *zone;
         load->exec->pts.n_points    += 4;
 
@@ -1548,8 +1546,6 @@
           if ( IS_HINTED( loader->load_flags ) && n_ins > 0 )
           {
             exec->is_composite     = TRUE;
-            exec->pedantic_hinting =
-              (FT_Bool)( loader->load_flags & FT_LOAD_PEDANTIC );
             error = TT_Run_Context( exec, ((TT_Size)loader->size)->debug );
             if ( error && exec->pedantic_hinting )
               goto Fail;
@@ -1973,6 +1969,12 @@
       /* load default graphics state - if needed */
       if ( size->GS.instruct_control & 2 )
         loader.exec->GS = tt_default_graphics_state;
+
+      loader.exec->pedantic_hinting =
+         FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
+
+      loader.exec->grayscale =
+         FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_LOAD_TARGET_MONO );
     }
 
 #endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */

src/truetype/ttinterp.c

@@ -6617,8 +6617,6 @@
   /* Opcode range: 0x88                                                    */
   /* Stack:        uint32 --> uint32                                       */
   /*                                                                       */
-  /* XXX: According to Apple specs, bits 1 & 2 of the argument ought to be */
-  /*      consulted before rotated/stretched info is returned.             */
   static void
   Ins_GETINFO( INS_ARG )
   {
@@ -6627,18 +6625,21 @@
 
     K = 0;
 
-    /* We return then Windows 3.1 version number */
-    /* for the font scaler                       */
+    /* We return MS rasterizer version 1.7 for the font scaler. */
     if ( ( args[0] & 1 ) != 0 )
-      K = 3;
+      K = 35;
 
-    /* Has the glyph been rotated ? */
-    if ( CUR.tt_metrics.rotated )
+    /* Has the glyph been rotated? */
+    if ( ( args[0] & 2 ) != 0 && CUR.tt_metrics.rotated )
       K |= 0x80;
 
-    /* Has the glyph been stretched ? */
-    if ( CUR.tt_metrics.stretched )
-      K |= 0x100;
+    /* Has the glyph been stretched? */
+    if ( ( args[0] & 4 ) != 0 && CUR.tt_metrics.stretched )
+      K |= 1 << 8;
+
+    /* Are we hinting for grayscale? */
+    if ( ( args[0] & 32 ) != 0 && CUR.grayscale )
+      K |= (1 << 12);
 
     args[0] = K;
   }

src/truetype/ttinterp.h

@@ -4,7 +4,7 @@
 /*                                                                         */
 /*    TrueType bytecode interpreter (specification).                       */
 /*                                                                         */
-/*  Copyright 1996-2001, 2002, 2003 by                                     */
+/*  Copyright 1996-2001, 2002, 2003, 2004 by                               */
 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 /*                                                                         */
 /*  This file is part of the FreeType project, and may only be used,       */
@@ -219,6 +219,8 @@ FT_BEGIN_HEADER
     FT_ULong           loadSize;
     TT_SubGlyph_Stack  loadStack;      /* loading subglyph stack */
 
+    FT_Bool            grayscale;      /* are we hinting for grayscale? */
+
   } TT_ExecContextRec;