gpos achieved

8 years ago · 2b2e8adc6f
parent b2077fba21
commit 2b2e8adc6f
4 changed files with 74 additions and 43 deletions
--- a/pitfall/fontkit/GPOS-test.rkt
+++ b/pitfall/fontkit/GPOS-test.rkt
@ -6,4 +6,4 @@
 (report 'start-decode)
 (define gpos (send GPOS decode (send f _getTableStream 'GPOS)))

-(send (dict-ref gpos 'lookupList) get 1)
+(send (dict-ref gpos 'lookupList) get 2)
--- a/pitfall/fontkit/GPOS.rkt
+++ b/pitfall/fontkit/GPOS.rkt
@ -15,10 +15,10 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
   'yPlacement int16be
   'xAdvance int16be
   'yAdvance int16be
-   'xPlaDevice uint16be ;; pointer
-   'yPlaDevice uint16be ;; pointer
-   'xAdvDevice uint16be ;; pointer
-   'yAdvDevice uint16be)) ;; pointer
+   'xPlaDevice (+Pointer uint16be Device (mhash 'type 'global 'relativeTo 'rel))
+   'yPlaDevice (+Pointer uint16be Device (mhash 'type 'global 'relativeTo 'rel))
+   'xAdvDevice (+Pointer uint16be Device (mhash 'type 'global 'relativeTo 'rel))
+   'yAdvDevice (+Pointer uint16be Device (mhash 'type 'global 'relativeTo 'rel))))

 (define-subclass object% (ValueRecord [key 'valueFormat])
  (define/public (buildStruct parent)
@ -38,7 +38,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
              (dictify 'rel (λ _ (dict-ref struct '_startOffset)))
              (for/list ([(key val) (in-dict format)]
                         #:when val)
-                (cons key (dict-ref types key)))))
+                        (cons key (dict-ref types key)))))
           (+Struct fields))))

  (define/public (size val ctx)
@ -79,12 +79,12 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
                                  ;; Design units plus Device tables
                                  3 (dictify 'xCoordinate int16be
                                             'yCoordinate int16be
-                                             'xDeviceTable uint16be  ; pointer
-                                             'yDeviceTable uint16be)))) ; pointer
+                                             'xDeviceTable (+Pointer uint16be Device)
+                                             'yDeviceTable (+Pointer uint16be Device)))))

 (define EntryExitRecord (+Struct
-                         (dictify 'entryAnchor uint16be ; pointer
-                                  'exitAnchor uint16be))) ; pointer
+                         (dictify 'entryAnchor (+Pointer uint16be Anchor (mhash 'type 'parent))
+                                  'exitAnchor (+Pointer uint16be Anchor (mhash 'type 'parent)))))

 (define MarkRecord (+Struct
                    (dictify 'class uint16be
@ -92,13 +92,13 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js

 (define MarkArray (+Array MarkRecord uint16be))

-(define BaseRecord (+Array uint16be)) ; pointer
+(define BaseRecord (+Array (+Pointer uint16be Anchor) (λ (t) (ref* t 'parent 'classCount))))

 (define BaseArray (+Array BaseRecord uint16be))

-(define ComponentRecord (+Array uint16be)) ; pointer
+(define ComponentRecord (+Array (+Pointer uint16be Anchor) (λ (t) (ref* t 'parent 'parent 'classCount))))
 (define LigatureAttach (+Array ComponentRecord uint16be))
-(define LigatureArray (+Array uint16be uint16be)) ; pointer
+(define LigatureArray (+Array (+Pointer uint16be LigatureAttach) uint16be))

 (define-subclass VersionedStruct (GPOSLookup-VersionedStruct))
 (define GPOSLookup
@ -114,7 +114,7 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
                            'valueFormat ValueFormat
                            'value (+ValueRecord))
                         2 (dictify
-                            'coverage uint16be ; pointer
+                            'coverage (+Pointer uint16be Coverage)
                            'valueFormat ValueFormat
                            'valueCount uint16be
                            'values (+LazyArray (+ValueRecord) 'valueCount))))
@ -123,19 +123,19 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
                        (dictify
                         ;; Adjustments for glyph pairs
                         1 (dictify
-                            'coverage uint16be ; pointer
+                            'coverage (+Pointer uint16be Coverage)
                            'valueFormat1 ValueFormat
                            'valueFormat2 ValueFormat
                            'pairSetCount uint16be
-                            'pairSets (+LazyArray uint16be 'pairSetCount)) ; pointer
+                            'pairSets (+LazyArray (+Pointer uint16be PairSet) 'pairSetCount))

                         ;; Class pair adjustment
                         2 (dictify
-                            'coverage uint16be ; pointer
+                            'coverage (+Pointer uint16be Coverage)
                            'valueFormat1 ValueFormat
                            'valueFormat2 ValueFormat
-                            'classDef1 uint16be ; pointer
-                            'classDef2 uint16be ; pointer
+                            'classDef1 (+Pointer uint16be ClassDef)
+                            'classDef2 (+Pointer uint16be ClassDef)
                            'class1Count uint16be
                            'class2Count uint16be
                            'classRecords (+LazyArray (+LazyArray Class2Record 'class2Count) 'class1Count))))
@ -143,36 +143,36 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
    ;; Cursive Attachment Positioning
    3 (dictify
       'format uint16be
-       'coverage uint16be ; pointer
+       'coverage (+Pointer uint16be Coverage)
       'entryExitCount uint16be
       'entryExitRecords (+Array EntryExitRecord 'entryExitCount))

    ;; MarkToBase Attachment Positioning
    4 (dictify
       'format uint16be
-       'markCoverage uint16be ; pointer
-       'baseCoverage uint16be ; pointer
+       'markCoverage (+Pointer uint16be Coverage)
+       'baseCoverage (+Pointer uint16be Coverage)
       'classCount uint16be
-       'markArray uint16be ; pointer
-       'baseArray uint16be) ; pointer
+       'markArray (+Pointer uint16be MarkArray)
+       'baseArray (+Pointer uint16be BaseArray))

    ;; MarkToLigature Attachment Positioning
    5 (dictify
       'format uint16be
-       'markCoverage uint16be ; pointer
-       'ligatureCoverage uint16be ; pointer
+       'markCoverage (+Pointer uint16be Coverage)
+       'ligatureCoverage (+Pointer uint16be Coverage)
       'classCount uint16be
-       'markArray uint16be ; pointer
-       'ligatureArray uint16be)
+       'markArray (+Pointer uint16be MarkArray)
+       'ligatureArray (+Pointer uint16be LigatureArray))

    ;; MarkToMark Attachment Positioning
    6 (dictify
       'format uint16be
-       'mark1Coverage uint16be ; pointer
-       'mark2Coverage uint16be ; pointer
+       'mark1Coverage (+Pointer uint16be Coverage)
+       'mark2Coverage (+Pointer uint16be Coverage)
       'classCount uint16be
-       'mark1Array uint16be ; pointer
-       'mark2Array uint16be) ; pointer
+       'mark1Array (+Pointer uint16be MarkArray)
+       'mark2Array (+Pointer uint16be BaseArray))

    7 Context ;; Contextual positioning
    8 ChainingContext ;; Chaining contextual positioning
@ -181,22 +181,21 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/GPOS.js
    9 (dictify
       'posFormat uint16be
       'lookupType uint16be ;; cannot also be 9
-       'extension uint32be) ; pointer
+       'extension (+Pointer uint32be (λ () (error 'circular-reference-unfixed))))
    )))

 ;; Fix circular reference
-;; GPOSLookup.versions[9].extension.type = GPOSLookup;
+(ref*-set! GPOSLookup 'versions 9 'extension 'type GPOSLookup)

 (define gpos-common-dict (dictify 'scriptList (+Pointer uint16be ScriptList)
                                  'featureList (+Pointer uint16be FeatureList)
-                                  'lookupList (+Pointer uint16be (LookupList GPOSLookup))
-                                  ))
+                                  'lookupList (+Pointer uint16be (LookupList GPOSLookup))))

 (define-subclass VersionedStruct (GPOS-MainVersionedStruct))
 (define GPOS (+GPOS-MainVersionedStruct uint32be
-                                    (dictify
-                                     #x00010000 gpos-common-dict
-                                     ;; ignore variations
-                                     #;#x00010001 #;(append gpos-common-dict (dictify 'featureVariations (+Pointer uint32be FeatureVariations))))))
+                                        (dictify
+                                         #x00010000 gpos-common-dict
+                                         ;; ignore variations
+                                         #;#x00010001 #;(append gpos-common-dict (dictify 'featureVariations (+Pointer uint32be FeatureVariations))))))

 (test-module)
--- a/pitfall/fontkit/opentype.rkt
+++ b/pitfall/fontkit/opentype.rkt
@ -52,8 +52,8 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/opentype.js
 (define-subclass Struct (FeatureRec))
 (define-subclass Pointer (FeatureRec-Pointer))
 (define FeatureRecord (+FeatureRec (dictify
-                                'tag (+String 4)
-                                'feature (+FeatureRec-Pointer uint16be Feature (mhash 'type 'parent)))))
+                                    'tag (+String 4)
+                                    'feature (+FeatureRec-Pointer uint16be Feature (mhash 'type 'parent)))))

 (define FeatureList (+Array FeatureRecord uint16be))

@ -92,6 +92,38 @@ https://github.com/mbutterick/fontkit/blob/master/src/tables/opentype.js
                        'rangeCount   uint16be
                        'rangeRecords (+Array RangeRecord 'rangeCount)))))

+;;#########################
+;; Class Definition Table #
+;;#########################
+
+(define ClassRangeRecord (+Struct
+                          (dictify
+                           'start uint16be
+                           'end uint16be
+                           'class uint16be)))
+
+(define ClassDef (+VersionedStruct uint16be
+                                   (dictify
+                                    1 ;; Class array
+                                    (dictify
+                                     'startGlyph uint16be
+                                     'glyphCount uint16be
+                                     'classValueArray (+Array uint16be 'glyphCount))
+                                    2 ;; Class ranges
+                                    (dictify
+                                     'classRangeCount uint16be
+                                     'classRangeRecord (+Array ClassRangeRecord 'classRangeCount)))))
+
+
+;;###############
+;; Device Table #
+;;###############
+
+(define Device (+Struct
+                (dictify
+                 'startSize uint16be
+                 'endSize uint16be
+                 'deltaFormat uint16be)))

 ;;#############################################
 ;; Contextual Substitution/Positioning Tables #
--- a/pitfall/restructure/struct.rkt
+++ b/pitfall/restructure/struct.rkt
@ -1,6 +1,6 @@
 #lang restructure/racket
 (require racket/dict "stream.rkt" racket/private/generic-methods racket/struct)
-(provide (all-defined-out))
+(provide (all-defined-out) ref* ref*-set!)
 (require (prefix-in d: racket/dict))

 #|