From 4b2c1017a7f5fe2461b5957912f51befb740f432 Mon Sep 17 00:00:00 2001 From: Matthew Butterick Date: Fri, 30 Nov 2018 13:04:13 -0800 Subject: [PATCH] gbye --- fontland/fontland/ttfglyph.rkt | 181 -------------------------- fontland/fontland/ttfglyphencoder.rkt | 13 -- 2 files changed, 194 deletions(-) delete mode 100644 fontland/fontland/ttfglyph.rkt delete mode 100644 fontland/fontland/ttfglyphencoder.rkt diff --git a/fontland/fontland/ttfglyph.rkt b/fontland/fontland/ttfglyph.rkt deleted file mode 100644 index 9081157a..00000000 --- a/fontland/fontland/ttfglyph.rkt +++ /dev/null @@ -1,181 +0,0 @@ -#lang racket/base -(require "racket.rkt") - -(require "glyph.rkt" xenomorph) -(provide (all-defined-out)) -#| -approximates -https://github.com/mbutterick/fontkit/blob/master/src/glyph/TTFGlyph.js -|# - -;; The header for both simple and composite glyphs -(define-subclass Struct (RGlyfHeader)) -(define GlyfHeader (+RGlyfHeader - (dictify 'numberOfContours int16be ;; if negative, this is a composite glyph - 'xMin int16be - 'yMin int16be - 'xMax int16be - 'yMax int16be))) - -;; Flags for simple glyphs -(define-macro (define-flag-series . IDS) - #`(match-define (list . IDS) (map (curry expt 2) (range #,(length (syntax->list #'IDS)))))) - -;; Flags for simple glyphs -(define-flag-series ON_CURVE - X_SHORT_VECTOR - Y_SHORT_VECTOR - REPEAT - SAME_X - SAME_Y) - -;; Flags for composite glyphs -(define-flag-series ARG_1_AND_2_ARE_WORDS - ARGS_ARE_XY_VALUES - ROUND_XY_TO_GRID - WE_HAVE_A_SCALE - __EMPTY-FLAG___ - MORE_COMPONENTS - WE_HAVE_AN_X_AND_Y_SCALE - WE_HAVE_A_TWO_BY_TWO - WE_HAVE_INSTRUCTIONS - USE_MY_METRICS - OVERLAP_COMPOUND - SCALED_COMPONENT_OFFSET - UNSCALED_COMPONENT_OFFSET) - -;; Represents a point in a simple glyph -(define-subclass object% (Point onCurve endContour [x 0] [y 0]) - - (define/public (copy) - (+Point onCurve endContour x y))) - -;; Represents a component in a composite glyph -(define-subclass object% (Component glyphID dx dy) - (field [pos 0] - [scaleX 1] - [scaleY 1] - [scale01 0] - [scale10 0])) - -;; Represents a TrueType glyph. -(define-subclass Glyph (TTFGlyph) - (inherit-field _font id) - - ;; Parses just the glyph header and returns the bounding box - (define/override (_getCBox internal) - (unfinished)) - - ;; Parses a single glyph coordinate - (define/public (_parseGlyphCoord port prev short same) - (unless (input-port? port) - (raise-argument-error '_parseGlyphCoord "input port" port)) - (unless (number? prev) - (raise-argument-error '_parseGlyphCoord "number" prev)) - (unless (and (boolean? short) (boolean? same)) - (raise-argument-error '_parseGlyphCoord "booleans" (list short same))) - (+ prev (if short - ((if (not same) - +) (decode uint8 port)) - (if same 0 (decode int16be port))))) - - - ;; Decodes the glyph data into points for simple glyphs, - ;; or components for composite glyphs - (define/public (_decode) - (define offsets (· _font loca offsets)) - (match-define (list glyfPos nextPos) (take (drop offsets id) 2)) - - ;; Nothing to do if there is no data for this glyph - (and (not (= glyfPos nextPos)) - (let () - (define port (send _font _getTableStream 'glyf)) - (pos port (+ (pos port) glyfPos)) - (define startPos (pos port)) - (define glyph (decode GlyfHeader port)) - (match (· glyph numberOfContours) - [(? positive?) (_decodeSimple glyph port)] - [(? negative?) (_decodeComposite glyph port startPos)]) - glyph))) - - (define/public (_decodeSimple glyph port) - (unless (dict? glyph) - (raise-argument-error 'TTFGlyph-_decodeSimple "decoded RGlyfHeader" glyph)) - - (unless (input-port? port) - (raise-argument-error 'TTFGlyph-_decodeSimple "input port" port)) - - ;; this is a simple glyph - (dict-set! glyph 'points empty) - (define endPtsOfContours (decode (+Array uint16be (· glyph numberOfContours)) port)) - (dict-set! glyph 'instructions (decode (+Array uint8be uint16be) port)) - (define numCoords (add1 (last endPtsOfContours))) - - (define flags - (for*/lists (flags) - ([i (in-naturals)] - #:break (= (length flags) numCoords) - [flag (in-value (decode uint8 port))] - [count (in-range (add1 (if (not (zero? (bitwise-and flag REPEAT))) - (decode uint8 port) - 0)))]) - flag)) - - (match-define-values - (points _ _) - (for/fold ([points empty] [px 0] [py 0]) - ([(flag i) (in-indexed flags)]) - (define point (+Point (zero? (bitwise-and flag ON_CURVE)) (and (index-of endPtsOfContours i) #t) 0 0)) - (define next-px (_parseGlyphCoord port px (not (zero? (bitwise-and flag X_SHORT_VECTOR))) (not (zero? (bitwise-and flag SAME_X))))) - (define next-py (_parseGlyphCoord port py (not (zero? (bitwise-and flag Y_SHORT_VECTOR))) (not (zero? (bitwise-and flag SAME_Y))))) - (set-field! x point next-px) - (set-field! y point next-py) - (values (cons point points) next-px next-py))) - (dict-set! glyph 'points (reverse points))) - - (define/public (_decodeComposite glyph port [offset 0]) - ;; this is a composite glyph - (dict-set! glyph 'components empty) - (define haveInstructions #f) - (define flags MORE_COMPONENTS) - - (dict-set! glyph 'components - (for/list ([i (in-naturals)] - #:break (zero? (bitwise-and flags MORE_COMPONENTS))) - (set! flags (send uint16be decode port)) - (define gPos (- (pos port) offset)) - (define glyphID (send uint16be decode port)) - (unless haveInstructions - (set! haveInstructions (not (zero? (bitwise-and flags WE_HAVE_INSTRUCTIONS))))) - - (match-define - (list dx dy) - (let ([decoder (if (not (zero? (bitwise-and flags ARG_1_AND_2_ARE_WORDS))) int16be int8)]) - (list (send decoder decode port) (send decoder decode port)))) - - (define component (+Component glyphID dx dy)) - (set-field! pos component gPos) - - (cond - [(not (zero? (bitwise-and flags WE_HAVE_A_SCALE))) - (define scale (read-fixed14 port)) - (set-field! scaleX component scale) - (set-field! scaleY component scale)] - [(not (zero? (bitwise-and flags WE_HAVE_AN_X_AND_Y_SCALE))) - (set-field! scaleX component (read-fixed14 port)) - (set-field! scaleY component (read-fixed14 port))] - [(not (zero? (bitwise-and flags WE_HAVE_A_TWO_BY_TWO))) - (set-field! scaleX component (read-fixed14 port)) - (set-field! scale01 component (read-fixed14 port)) - (set-field! scale10 component (read-fixed14 port)) - (set-field! scaleY component (read-fixed14 port))]) - component)) - haveInstructions)) - - -(define (bytes->fixed14 b1 b2) - (/ (+ (* b1 (expt 2 8)) b2) (expt 2 14) 1.0)) - -(define (read-fixed14 stream) - (define b1 (send uint8 decode stream)) - (define b2 (send uint8 decode stream)) - (bytes->fixed14 b1 b2)) \ No newline at end of file diff --git a/fontland/fontland/ttfglyphencoder.rkt b/fontland/fontland/ttfglyphencoder.rkt deleted file mode 100644 index 83521504..00000000 --- a/fontland/fontland/ttfglyphencoder.rkt +++ /dev/null @@ -1,13 +0,0 @@ -#lang racket/base -(require "racket.rkt") - -(provide TTFGlyphEncoder) - -(define-subclass object% (TTFGlyphEncoder) - (as-methods - encodeSimple - _encodePoint)) - -(define-stub encodeSimple) - -(define-stub _encodePoint) \ No newline at end of file