tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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stretchy.py (2815B)

      1 #!/usr/bin/env python3
      2 
      3 from utils import mathfont
      4 import fontforge
      5 
      6 # Create a WOFF font with glyphs for all the operator strings.
      7 font = mathfont.create("stretchy", "Copyright (c) 2021-2024 Igalia S.L.")
      8 
      9 font.math.AxisHeight = 0
     10 
     11 # Set parameters for stretchy tests.
     12 font.math.MinConnectorOverlap = mathfont.em // 2
     13 
     14 # Make sure that underover parameters don't add extra spacing.
     15 font.math.LowerLimitBaselineDropMin = 0
     16 font.math.LowerLimitGapMin = 0
     17 font.math.StretchStackBottomShiftDown = 0
     18 font.math.StretchStackGapAboveMin = 0
     19 font.math.UnderbarVerticalGap = 0
     20 font.math.UnderbarExtraDescender = 0
     21 font.math.UpperLimitBaselineRiseMin = 0
     22 font.math.UpperLimitGapMin = 0
     23 font.math.StretchStackTopShiftUp = 0
     24 font.math.StretchStackGapBelowMin = 0
     25 font.math.OverbarVerticalGap = 0
     26 font.math.AccentBaseHeight = 0
     27 font.math.OverbarExtraAscender = 0
     28 
     29 # These two characters will be stretchable in both directions.
     30 horizontalArrow = 0x295A  # LEFTWARDS HARPOON WITH BARB UP FROM BAR
     31 verticalArrow = 0x295C  # UPWARDS HARPOON WITH BARB RIGHT FROM BAR
     32 upDownArrowWithBase = 0x21A8 # UP DOWN ARROW WITH BASE
     33 
     34 mathfont.createSizeVariants(font, aUsePUA=True, aCenterOnBaseline=False)
     35 
     36 # Add stretchy vertical and horizontal constructions for the horizontal arrow.
     37 mathfont.createSquareGlyph(font, horizontalArrow)
     38 mathfont.createStretchy(font, horizontalArrow, True)
     39 mathfont.createStretchy(font, horizontalArrow, False)
     40 
     41 # Add stretchy vertical and horizontal constructions for the vertical arrow.
     42 mathfont.createSquareGlyph(font, verticalArrow)
     43 mathfont.createStretchy(font, verticalArrow, True)
     44 mathfont.createStretchy(font, verticalArrow, False)
     45 
     46 # U+21A8 stretches vertically using two size variants: a base glyph (of height
     47 # half an em) and taller glyphs (of heights 1, 2, 3 and 4 em).
     48 g = font.createChar(upDownArrowWithBase)
     49 mathfont.drawRectangleGlyph(g, mathfont.em, mathfont.em/2, 0)
     50 font[upDownArrowWithBase].verticalVariants = "uni21A8 v0 v1 v2 v3"
     51 
     52 mathfont.save(font)
     53 
     54 
     55 # Create a font to test RTL operators.
     56 font = mathfont.create("stretchy-text-direction-asymetrical", "Copyright (c) 2025 Igalia S.L.")
     57 
     58 # Left and right parentheses and brackets, in the following order: { ) } (
     59 codePoints = (0x007B, 0x0029, 0x007D, 0x0028)
     60 
     61 for i, point in enumerate(codePoints):
     62    em = mathfont.em
     63    width = int(em * (i + 1))
     64    ascent = em
     65 
     66    glyph = font.createChar(point)
     67    mathfont.drawRectangleGlyph(glyph, width, ascent)
     68 
     69    for size in (0, 1, 2, 3):
     70        g = font.createChar(-1, "v%d%d" % (size, i))
     71        mathfont.drawRectangleGlyph(g, width, (size + 1) * ascent, 0)
     72 
     73    font[point].verticalVariants = "v0%d v1%d v2%d v3%d" % ((i,) * 4)
     74    font[point].verticalComponents = \
     75        (("v2%d" % i, False, 0, width, 3 * em),
     76         ("v1%d" % i, True, em, width, 2 * em))
     77 
     78 mathfont.save(font)