Added support for character level mirroring...

Author: mta452

Source/SFCodepoints.c

@@ -14,30 +14,48 @@
  * limitations under the License.
  */
 
+#include <SBBase.h>
+#include <SBCodepointSequence.h>
 #include <SFConfig.h>
-#include <stddef.h>
 
 #include "SFAssert.h"
 #include "SFBase.h"
 #include "SFCodepoints.h"
 
+SF_INTERNAL SFCodepoint SFCodepointsGetMirror(SFCodepoint codepoint)
+{
+    SFCodepoint mirror = SBCodepointGetMirror(codepoint);
+    if (!mirror) {
+        return codepoint;
+    }
+
+    return mirror;
+}
+
 SF_INTERNAL void SFCodepointsInitialize(SFCodepointsRef codepoints, const SBCodepointSequence *referral, SFBoolean backward)
 {
-    codepoints->referral = referral;
+    codepoints->_referral = referral;
+    codepoints->_token = SFInvalidIndex;
     codepoints->index = SFInvalidIndex;
     codepoints->backward = backward;
 }
 
 SF_INTERNAL void SFCodepointsReset(SFCodepointsRef codepoints)
 {
-    codepoints->index = (!codepoints->backward ? 0 : codepoints->referral->stringLength);
+    codepoints->_token = (!codepoints->backward ? 0 : codepoints->_referral->stringLength);
 }
 
 SF_INTERNAL SFCodepoint SFCodepointsNext(SFCodepointsRef codepoints)
 {
+    SFCodepoint current;
+
     if (!codepoints->backward) {
-        return SBCodepointSequenceGetCodepointAt(codepoints->referral, &codepoints->index);
+        codepoints->index = codepoints->_token;
+        current = SBCodepointSequenceGetCodepointAt(codepoints->_referral, &codepoints->_token);
+    } else {
+        current = SBCodepointSequenceGetCodepointBefore(codepoints->_referral, &codepoints->_token);
+        codepoints->index = codepoints->_token;
     }
 
-    return SBCodepointSequenceGetCodepointBefore(codepoints->referral, &codepoints->index);
+    return current;
 }

Source/SFCodepoints.h

@@ -17,17 +17,20 @@
 #ifndef _SF_INTERNAL_CODEPOINTS_H
 #define _SF_INTERNAL_CODEPOINTS_H
 
-#include <SFConfig.h>
 #include <SBCodepointSequence.h>
+#include <SFConfig.h>
 
 #include "SFBase.h"
 
 typedef struct _SFCodepoints {
-    const SBCodepointSequence *referral;
+    const SBCodepointSequence *_referral;
+    SFUInteger _token;
     SFUInteger index;
     SFBoolean backward;
 } SFCodepoints, *SFCodepointsRef;
 
+SF_INTERNAL SFCodepoint SFCodepointsGetMirror(SFCodepoint codepoint);
+
 SF_INTERNAL void SFCodepointsInitialize(SFCodepointsRef codepoints, const SBCodepointSequence *referral, SFBoolean backward);
 SF_INTERNAL void SFCodepointsReset(SFCodepointsRef codepoints);
 SF_INTERNAL SFCodepoint SFCodepointsNext(SFCodepointsRef codepoints);

Source/SFGlyphDiscovery.c

@@ -63,26 +63,15 @@ SF_INTERNAL void _SFDiscoverGlyphs(SFTextProcessorRef processor)
     SFCodepointsReset(album->codepoints);
 
     switch (processor->_textMode) {
-        case SFTextModeForward: {
-            SFUInteger initialIndex = codepoints->index;
-            SFCodepoint current;
-
-            while ((current = SFCodepointsNext(codepoints)) != SFCodepointInvalid) {
-                SFGlyphID glyph = SFFontGetGlyphIDForCodepoint(font, current);
-                SFGlyphTraits traits = _SFGetGlyphTraits(processor, glyph);
-                SFAlbumAddGlyph(album, glyph, traits, initialIndex);
-
-                initialIndex = codepoints->index;
-            }
-            break;
-        }
-
+        case SFTextModeForward:
         case SFTextModeBackward: {
             SFCodepoint current;
 
             while ((current = SFCodepointsNext(codepoints)) != SFCodepointInvalid) {
-                SFGlyphID glyph = SFFontGetGlyphIDForCodepoint(font, current);
+                SFCodepoint mirror = SFCodepointsGetMirror(current);
+                SFGlyphID glyph = SFFontGetGlyphIDForCodepoint(font, mirror);
                 SFGlyphTraits traits = _SFGetGlyphTraits(processor, glyph);
+
                 SFAlbumAddGlyph(album, glyph, traits, codepoints->index);
             }
             break;