[cache] Switch to lazy SBit setting.

* src/cache/ftcsbits.c (ftc_sbit_copy_bitmap): Removed.
(ftc_snode_load): Take the bitmap ownership instead of copying.

ChangeLog

@@ -1,3 +1,10 @@
+2021-04-18  Alexei Podtelezhnikov  <apodtele@gmail.com>
+
+	[cache] Switch to lazy SBit setting.
+
+	* src/cache/ftcsbits.c (ftc_sbit_copy_bitmap): Removed.
+	(ftc_snode_load): Take the bitmap ownership instead of copying.
+
 2021-04-16  Daniel Welty  <@danielwelty>
 
 	* src/cache/ftcsbits.c (ftc_snode_load): Properly handle short pitch.

src/cache/ftcsbits.c

@@ -38,30 +38,6 @@
   /*************************************************************************/
 
 
-  static FT_Error
-  ftc_sbit_copy_bitmap( FTC_SBit    sbit,
-                        FT_Bitmap*  bitmap,
-                        FT_Memory   memory )
-  {
-    FT_Error  error;
-    FT_Int    pitch = bitmap->pitch;
-    FT_ULong  size;
-
-
-    if ( pitch < 0 )
-      pitch = -pitch;
-
-    size = (FT_ULong)pitch * bitmap->rows;
-    if ( !size )
-      return FT_Err_Ok;
-
-    if ( !FT_ALLOC( sbit->buffer, size ) )
-      FT_MEM_COPY( sbit->buffer, bitmap->buffer, size );
-
-    return error;
-  }
-
-
   FT_LOCAL_DEF( void )
   ftc_snode_free( FTC_Node   ftcsnode,
                   FTC_Cache  cache )
@@ -108,7 +84,6 @@
     FT_Error          error;
     FTC_GNode         gnode  = FTC_GNODE( snode );
     FTC_Family        family = gnode->family;
-    FT_Memory         memory = manager->memory;
     FT_Face           face;
     FTC_SBit          sbit;
     FTC_SFamilyClass  clazz;
@@ -123,7 +98,7 @@
     sbit  = snode->sbits + ( gindex - gnode->gindex );
     clazz = (FTC_SFamilyClass)family->clazz;
 
-    sbit->buffer = 0;
+    sbit->buffer = NULL;
 
     error = clazz->family_load_glyph( family, gindex, manager, &face );
     if ( error )
@@ -178,8 +153,9 @@
       sbit->format    = (FT_Byte)bitmap->pixel_mode;
       sbit->max_grays = (FT_Byte)(bitmap->num_grays - 1);
 
-      /* copy the bitmap into a new buffer -- ignore error */
-      error = ftc_sbit_copy_bitmap( sbit, bitmap, memory );
+      /* take the bitmap ownership */
+      sbit->buffer = bitmap->buffer;
+      slot->internal->flags &= ~FT_GLYPH_OWN_BITMAP;
 
       /* now, compute size */
       if ( asize )