From a11126351360c5939e35a5a07014f9b1ee27156c Mon Sep 17 00:00:00 2001
From: Matthew Butterick <mb@mbtype.com>
Date: Mon, 26 Nov 2018 16:36:15 -0800
Subject: [PATCH] explore

---
 pitfall/pitfall/embedded.rkt |  48 ++++++++++++++++++-----------------
 pitfall/pitfall/text.rkt     |   9 ++++---
 pitfall/ptest/out.bin        | Bin 4688 -> 7870 bytes
 pitfall/ptest/test0.pdf      |   2 +-
 pitfall/ptest/test0c.pdf     | Bin 693 -> 693 bytes
 pitfall/ptest/test18.pdf     | Bin 11071 -> 11071 bytes
 pitfall/ptest/test18c.pdf    | Bin 6986 -> 6986 bytes
 pitfall/ptest/test4crkt.pdf  | Bin 2810 -> 0 bytes
 8 files changed, 31 insertions(+), 28 deletions(-)

diff --git a/pitfall/pitfall/embedded.rkt b/pitfall/pitfall/embedded.rkt
index 1d2b1a75..4ba27a25 100644
--- a/pitfall/pitfall/embedded.rkt
+++ b/pitfall/pitfall/embedded.rkt
@@ -30,15 +30,17 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
    embed
    toUnicodeCmap))
 
-(define/contract (widthOfString this string size [features #f])
-  ((string? number?) ((option/c list?)) . ->*m . number?)
-  (cond
-    [features ; #f disables features ; null enables default features ; list adds features
-     (define run (send (· this font) layout string features))
-     (define width (· run advanceWidth))
-     (define scale (/ size (+ (· this font unitsPerEm) 0.0)))
-     (* width scale)]
-    [else (send (· this font) measure-string string size)]))
+(define width-cache (make-hash))
+(define (widthOfString this string size [features #f])
+  ((string? number?) ((option/c (listof symbol?))) . ->*m . number?)
+  ; #f disables features ; null enables default features ; list adds features
+  (hash-ref! width-cache
+             (list string size (and features (sort features symbol<?)))
+             (λ ()
+               (define run (send (· this font) layout string features))
+               (define width (· run advanceWidth))
+               (define scale (/ size (+ (· this font unitsPerEm) 0.0)))
+               (* width scale))))
 
 
 ;; called from text.rkt
@@ -49,14 +51,14 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
   (define glyphRun (send (· this font) layout text features))
   (define glyphs (· glyphRun glyphs))
   (for ([g (in-list glyphs)])
-    (· g id))
+       (· g id))
   (define positions (· glyphRun positions))
   #;(report/file (for/list ([p (in-list positions)])
-                 (list (· p xAdvance) (· p xOffset))))
+                           (list (· p xAdvance) (· p xOffset))))
   (define-values (subset-idxs new-positions)
     (for/lists (idxs posns)
-      ([(glyph i) (in-indexed glyphs)]
-       [posn (in-list positions)])
+               ([(glyph i) (in-indexed glyphs)]
+                [posn (in-list positions)])
       (define gid (send (· this subset) includeGlyph (· glyph id)))
       (define subset-idx (toHex gid))
       (set-field! advanceWidth posn (· glyph advanceWidth))
@@ -73,7 +75,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
   #'(for/sum ([c (in-list (list COND ...))]
               [v (in-list (list VAL ...))]
               #:when c)
-      v))
+             v))
 
 (define/contract (embed this)
   (->m void?)
@@ -104,7 +106,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
   ;; generate a random tag (6 uppercase letters. 65 is the char code for 'A')
   (when (test-mode) (random-seed 0))
   (define tag (list->string (for/list ([i (in-range 6)])
-                              (integer->char (random 65 (+ 65 26))))))
+                                      (integer->char (random 65 (+ 65 26))))))
   (define name (string-append tag "+" (· this font postscriptName)))
 
   (define bbox (· this font bbox))
@@ -143,7 +145,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
                                  'Supplement 0)
                                 'FontDescriptor descriptor
                                 'W (list 0 (for/list ([idx (in-range (length (hash-keys (· this widths))))])
-                                             (hash-ref (· this widths) idx (λ () (error 'embed (format "hash key ~a not found" idx)))))))))
+                                                     (hash-ref (· this widths) idx (λ () (error 'embed (format "hash key ~a not found" idx)))))))))
 
   (· descendantFont end)
   #;(report (· descendantFont toString) 'descendantFont)
@@ -163,12 +165,12 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/font/embedded.coffee
   (define cmap (· this document ref))
   (define entries
     (for/list ([idx (in-range (length (hash-keys (· this unicode))))])
-      (define codePoints (hash-ref (· this unicode) idx))
-      (define encoded ; encode codePoints to utf16
-        ;; todo: full utf16 support. for now just utf8
-        (for/list ([value (in-list codePoints)])
-          (toHex value)))
-      (format "<~a>" (string-join encoded " "))))
+              (define codePoints (hash-ref (· this unicode) idx))
+              (define encoded ; encode codePoints to utf16
+                ;; todo: full utf16 support. for now just utf8
+                (for/list ([value (in-list codePoints)])
+                          (toHex value)))
+              (format "<~a>" (string-join encoded " "))))
 
   (define unicode-cmap-str #<<HERE
 /CIDInit /ProcSet findresource begin
@@ -203,7 +205,7 @@ HERE
   (() () #:rest (listof number?) . ->*m . string?)
   (string-append*
    (for/list ([code (in-list codePoints)])
-     (~r code #:base 16 #:min-width 4 #:pad-string "0"))))
+             (~r code #:base 16 #:min-width 4 #:pad-string "0"))))
                  
 
 (module+ test
diff --git a/pitfall/pitfall/text.rkt b/pitfall/pitfall/text.rkt
index 5bc724c3..967066a4 100644
--- a/pitfall/pitfall/text.rkt
+++ b/pitfall/pitfall/text.rkt
@@ -67,7 +67,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
          (error 'unimplemented-branch-of-_text)] ; todo
       [else ; render paragraphs as single lines
        (for ([line (in-list (string-split text "\n"))])
-         (lineCallback line options))]))
+            (lineCallback line options))]))
   
   this)
 
@@ -93,7 +93,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
     (when (· this _textOptions)
       (for ([(key val) (in-hash (· this _textOptions))]
             #:unless (equal? (key "continued")))
-        (hash-ref! options key val)))
+           (hash-ref! options key val)))
 
     ;; Update the current position
     (when x (set-field! x this x))
@@ -117,8 +117,8 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
   ;; 180325 suppress the size tracking: we'll do our own line measurement
   ;; 181120 unsuppress the size tracking for now because it breaks test 04
   (if (not wrapper)
-        (increment-field! x this (send this widthOfString text))
-        (increment-field! y (+ (send this currentLineHeight #t) lineGap)))
+      (increment-field! x this (send this widthOfString text))
+      (increment-field! y (+ (send this currentLineHeight #t) lineGap)))
   (void))
 
 
@@ -197,6 +197,7 @@ https://github.com/mbutterick/pdfkit/blob/master/lib/mixins/text.coffee
   ;; since the normal Tw operator only works on character code 32, which isn't
   ;; used for embedded fonts.
   ;; 180321: the first call to this operation is very slow from Quad
+  ;; 181126: because `encode` calls `layout`
   (match-define (list encoded-char-strs positions)
     (if (not (zero? wordSpacing))
         (error 'unimplemented-brach) ; todo
diff --git a/pitfall/ptest/out.bin b/pitfall/ptest/out.bin
index 20df75213d767c7ea2233525f3cb8991dfca9842..cedbe02c99ce7bc2fd41fdd6a03c81b24910be0f 100644
GIT binary patch
delta 4044
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diff --git a/pitfall/ptest/test0.pdf b/pitfall/ptest/test0.pdf
index eaec4037..624d6d2e 100644
--- a/pitfall/ptest/test0.pdf
+++ b/pitfall/ptest/test0.pdf
@@ -27,7 +27,7 @@ endobj
 <<
 /Producer (PDFKit)
 /Creator (PDFKit)
-/CreationDate (D:20181120220342Z)
+/CreationDate (D:20181126220022Z)
 >>
 endobj
 2 0 obj
diff --git a/pitfall/ptest/test0c.pdf b/pitfall/ptest/test0c.pdf
index 2be69d7cd00a31275104f30f41693cb3b0cf7c8f..46b6aa1cbbdf0095ce2ff9cc30ea025920be59d3 100644
GIT binary patch
delta 19
acmdnWx|MYU6C<0Mk&%Ic(Pj?DwTu8W^8~~I

delta 19
acmdnWx|MYU6C;~}k&%J1$z~45wTu8W(gec*

diff --git a/pitfall/ptest/test18.pdf b/pitfall/ptest/test18.pdf
index ebaa46e651ef6c2a54888c06780e50f070e34550..c71736ed05a4794fb24058be80143028501c43ba 100644
GIT binary patch
delta 54
zcmdlVwm)n`B`dp`k&%IssmbI9R!cU=&@gw$$jSRzZ$p`z7qBg6hOs@lz9|3z>bMcy

delta 54
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diff --git a/pitfall/ptest/test18c.pdf b/pitfall/ptest/test18c.pdf
index 64adef12e21a64230ee08046ca0a104a50f49a00..df0b14246b6f0a7cea5b399989d93c6e5c4d46fa 100644
GIT binary patch
delta 54
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delta 54
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diff --git a/pitfall/ptest/test4crkt.pdf b/pitfall/ptest/test4crkt.pdf
index 7f8afb7705779dfd2eadebb464e5f86312a2d705..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 100644
GIT binary patch
literal 0
HcmV?d00001

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