Fixes for rendering.

The Type 1 advance width calculation passes null for glyph slot,
etc, which can cause null pointer access in the new interpreter.
Fall back to the old one for now.

Fix the large glyph retry code and ensure hinting and scaling flags
are set properly.

* src/type1/t1gload.c (T1_Parse_Glyph_And_Get_Char_String): Add a
check for metrics_only.
Set the `force_scaling' flag.
(T1_Parse_Glyph): Updated.
(T1_Load_Glyph): Add `hinting' and `scaled' flags.

ChangeLog

@@ -1,3 +1,20 @@
+2017-09-25  Ewald Hew  <ewaldhew@gmail.com>
+
+	[type1] Fixes for rendering.
+
+	The Type 1 advance width calculation passes null for glyph slot,
+	etc, which can cause null pointer access in the new interpreter.
+	Fall back to the old one for now.
+
+	Fix the large glyph retry code and ensure hinting and scaling flags
+	are set properly.
+
+	* src/type1/t1gload.c (T1_Parse_Glyph_And_Get_Char_String): Add a
+	check for metrics_only.
+	Set the `force_scaling' flag.
+	(T1_Parse_Glyph): Updated.
+	(T1_Load_Glyph): Add `hinting' and `scaled' flags.
+
 2017-09-25  Ewald Hew  <ewaldhew@gmail.com>
 
 	[psaux] Add missing objects (2/2).
@@ -198,7 +215,7 @@
 
 	[psaux] Minor fix.
 
-	Use `MultiMasters' service in `psaux' instead of a call to `cff'. 
+	Use `MultiMasters' service in `psaux' instead of a call to `cff'.
 	The project builds if CFF_CONFIG_OPTION_OLD_ENGINE is not defined.
 
 	* src/psaux/cf2ft.c: Update includes.

src/type1/t1gload.c

@@ -59,7 +59,8 @@
   static FT_Error
   T1_Parse_Glyph_And_Get_Char_String( T1_Decoder  decoder,
                                       FT_UInt     glyph_index,
-                                      FT_Data*    char_string )
+                                      FT_Data*    char_string,
+                                      FT_Bool*    force_scaling )
   {
     T1_Face   face  = (T1_Face)decoder->builder.face;
     T1_Font   type1 = &face->type1;
@@ -99,7 +100,8 @@
     if ( !error )
     {
       /* choose which renderer to use */
-      if ( driver->hinting_engine == FT_T1_HINTING_FREETYPE )
+      if ( driver->hinting_engine == FT_T1_HINTING_FREETYPE ||
+           decoder->builder.metrics_only )
         error = decoder_funcs->parse_charstrings_old( decoder,
                                                       (FT_Byte*)char_string->pointer,
                                                       (FT_UInt)char_string->length );
@@ -117,7 +119,6 @@
                                                   (FT_Byte*)char_string->pointer,
                                                   (FT_ULong)char_string->length );
 
-#if 0 /* TODO(ewaldhew) */
         /* Adobe's engine uses 16.16 numbers everywhere;              */
         /* as a consequence, glyphs larger than 2000ppem get rejected */
         if ( FT_ERR_EQ( error, Glyph_Too_Big ) )
@@ -125,15 +126,14 @@
           /* this time, we retry unhinted and scale up the glyph later on */
           /* (the engine uses and sets the hardcoded value 0x10000 / 64 = */
           /* 0x400 for both `x_scale' and `y_scale' in this case)         */
-          hinting       = FALSE;
-          force_scaling = TRUE;
-          glyph->hint   = hinting;
+          ((T1_GlyphSlot)decoder->builder.glyph)->hint = FALSE;
+
+          *force_scaling = TRUE;
 
           error = decoder_funcs->parse_charstrings( &psdecoder,
                                                     (FT_Byte*)char_string->pointer,
                                                     (FT_ULong)char_string->length );
         }
-#endif
       }
 
     }
@@ -170,8 +170,10 @@
                   FT_UInt     glyph_index )
   {
     FT_Data   glyph_data;
+    FT_Bool   force_scaling = FALSE;
     FT_Error  error = T1_Parse_Glyph_And_Get_Char_String(
-                        decoder, glyph_index, &glyph_data );
+                        decoder, glyph_index, &glyph_data,
+                        &force_scaling );
 
 
 #ifdef FT_CONFIG_OPTION_INCREMENTAL
@@ -322,6 +324,8 @@
     T1_DecoderRec           decoder;
     T1_Face                 face = (T1_Face)t1glyph->face;
     FT_Bool                 hinting;
+    FT_Bool                 scaled;
+    FT_Bool                 force_scaling = FALSE;
     T1_Font                 type1         = &face->type1;
     PSAux_Service           psaux         = (PSAux_Service)face->psaux;
     const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
@@ -369,7 +373,10 @@
 
     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
+    scaled  = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 );
 
+    glyph->hint     = hinting;
+    glyph->scaled   = scaled;
     t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
 
     error = decoder_funcs->init( &decoder,
@@ -399,13 +406,15 @@
 
     /* now load the unscaled outline */
     error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
-                                                &glyph_data );
+                                                &glyph_data,
+                                                &force_scaling );
     if ( error )
       goto Exit;
 #ifdef FT_CONFIG_OPTION_INCREMENTAL
     glyph_data_loaded = 1;
 #endif
 
+    hinting     = glyph->hint;
     font_matrix = decoder.font_matrix;
     font_offset = decoder.font_offset;
 
@@ -495,7 +504,7 @@
         }
 #endif
 
-        if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
+        if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 || force_scaling )
         {
           /* scale the outline and the metrics */
           FT_Int       n;