Class: Skrift::X11::Glyphs

Inherits:
Object
  • Object
show all
Defined in:
lib/skrift/x11/glyphs.rb,
lib/skrift/x11/boxdrawing.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dpy, font = nil, fontset: nil, x_scale:, y_scale:, pic: nil, fixed: nil, maxheight: nil, fit: false) ⇒ Glyphs

Returns a new instance of Glyphs.



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# File 'lib/skrift/x11/glyphs.rb', line 40

def initialize dpy, font=nil, fontset: nil, x_scale:, y_scale:, pic: nil, fixed: nil, maxheight: nil, fit: false
  @fontset = fontset
  @fonts = @fontset ? [] : [font]
  @font = font || load_font(0)
  @maxheight = maxheight

  @dpy = dpy
  @sft = SFT.new(@font)
  @sft.x_scale = x_scale
  @sft.y_scale = y_scale
  @pic = pic
  @fixed = fixed
  # When set (with a fixed cell), glyphs whose natural size exceeds the
  # cell are scaled down to fit and centred instead of being clamped
  # (and distorted) at the cell edge by the rasteriser.
  @fit = fit

  g = @sft.gmetrics(@sft.lookup("M".ord))
  if !g
    g = @sft.gmetrics(0)
  end
  if g
    @fixed_width = g.advance_width.ceil
  else
    @fixed_width = x_scale
  end

  @nextgid = 1
  @glyphcache = {}
  @colcache   = {}
  @chcache = {}

  @lm = @sft.lmetrics

  # The glyph set
  @gfmt     = @dpy.render_find_standard_format(:a8).id
  @glyphset = @dpy.render_create_glyph_set(@gfmt)
end

Instance Attribute Details

#fixed_width ⇒ Object (readonly)

Returns the value of attribute fixed_width.



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# File 'lib/skrift/x11/glyphs.rb', line 18

def fixed_width
  @fixed_width
end

#lm ⇒ Object

Returns the value of attribute lm.



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# File 'lib/skrift/x11/glyphs.rb', line 79

def lm
  @lm
end

#maxheight ⇒ Object

Returns the value of attribute maxheight.



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# File 'lib/skrift/x11/glyphs.rb', line 19

def maxheight
  @maxheight
end

Instance Method Details

#cache_box(ch) ⇒ Object 



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# File 'lib/skrift/x11/boxdrawing.rb', line 12

def cache_box(ch)
  @boxcache ||= {}
  c = @boxcache[ch] if @boxcache[ch]

  hx = (boxw+1)/2
  hy = (boxh+1)/2
  yoff = hy*stride
  img = nil
  h = 1 # 1/3 width of "heavy" line

  lh = light_h = [-255,   0,255,  0, 255]; hh = heavy_h = [-255,  -h,255,  h, 255]
  lv = light_v = [   0,-255,  0,255, 255]; hv = heavy_v = [  -h,-255,  h,255, 255]

  ll = light_l = [-255,   0,  0,  0, 255]; hl = heavy_l = [-255,  -h,  0,  h, 255]
  lu = light_u = [   0,-255,  0,  0, 255]; hu = heavy_u = [  -h,-255,  h,  0, 255]
  lr = light_r = [   0,   0,255,  0, 255]; hr = heavy_r = [   0,  -h,255,  h, 255]
  ld = light_d = [   0,   0,  0,255, 255]; hd = heavy_d = [  -h,   0,  h,255, 255]

  hc      = [  -h,  -h,  h,  h, 255] # Heavy centre

  d = 2
  dblc = [-d+1, -d+1, d-1, d-1, 0] # Gap in centre of double lines.
  light_vc = [0, -d, 0, d, 255] # Light vertical crossing centre of double line.

  dh = double_h = [-255,-d,255,-d, 255] + [-255, d,255, d, 255]
  dv = double_v = [-d,-255,-d,255, 255] + [d,-255,d,255, 255]

  mask_vbar = [-d+1,-255,d-1,255,0]
  mask_hbar = [-255,-d+1,255,d-1,0]

  mt= masktop    = [-255,-255, 255,  -1, 0]; maskdtop   = [-255,-255, 255,-d-1, 0]
  ml=maskleft   = [-255,-255,  -1, 255, 0]; maskdleft  = [-255,-255,-d-1, 255, 0]
  mb=maskbottom = [-255,   1, 255, 255, 0]; maskdbottom= [-255, d+1, 255, 255, 0]
  mr=maskright  = [   1,-255, 255, 255, 0]; maskdright = [ d+1,-255, 255, 255, 0]

  mask_lbar = [-255,-d+1,d-1,d-1, 0]; dlbar=double_lbar = [-255,-d,d,d, 255]
  mask_tbar = [-d+1,-255,d-1,d-1, 0]; dtbar=double_tbar = [-d,-255,d,d, 255]
  mask_rbar = [-d+1,-d+1,255,d-1, 0]; drbar=double_rbar = [-d,-d,255,d, 255]
  mask_dbar = [-d+1,-d+1,d-1,255, 0]; ddbar=double_dbar = [-d,-d,d,255, 255]

  mask_c = [0,0,0,0,0]

  hdl = heavy_dl = [heavy_d, heavy_l, hc]
  hdr = heavy_dr = [heavy_d, heavy_r, hc]
  hlu = heavy_lu = [heavy_l, heavy_u, hc]
  hru = heavy_ru = [heavy_r, heavy_u, hc]
  ldl = light_dl = [light_d, light_l]
  ldr = light_dr = [light_d, light_r]
  llu = light_lu = [light_l, light_u]
  lru = light_ru = [light_r, light_u]

  # FIXME Makes stipples wider when tx/ty etc. are big enough
  tx = hx - boxw / 3
  mv2 = mask_v2 = [[-tx, -255, -tx, 255, 0], [tx, -255, tx, 255,0]]

  ty = hy - boxh / 3
  mh2 = mask_h2 = [[-255,-ty, 255,-ty,0], [-255,ty,255,ty,0]]

  rects = {
    0x2500 => lh,       0x2501 => hh,       0x2502 => lv,       0x2503 => hv,
    0x2504 => lh + mv2, 0x2505 => hh + mv2, 0x2506 => lv + mh2, 0x2507 => hv + mv2,
    0x2508 => lh,  # FIXME: Stippled
    0x2509 => hh,  # FIXME: Stippled
    0x250A => lv,  # FIXME: Stippled
    0x250B => hv,  # FIXME: Stippled

    0x250C => ldr,       0x250D => hr + ld,  0x250E => hd + lr,  0x250F => hdr,
    0x2510 => ldl,       0x2511 => hl + ld,  0x2512 => [hd, ll], 0x2513 => hdl,
    0x2514 => lru,       0x2515 => lu + hr,  0x2516 => lr + hu,  0x2517 => hru,
    0x2518 => llu,       0x2519 => [hl, lu], 0x251a => [ll, hu], 0x251b => hlu,
    0x251c => lv+lr,     0x251d => [lv, hr], 0x251e => ldr + hu, 0x251f => [lru, hd],

    0x2520 => hv  +  lr, 0x2521 => hru +  ld, 0x2522 => hdr +  lu, 0x2523 => hv  + hr,
    0x2524 => ll  +  lv, 0x2525 => hl  +  lv, 0x2526 => hu  + ldl, 0x2527 => hd  +  lu,
    0x2528 => hv  +  ll, 0x2529 => hlu +  ld, 0x252a => hdl+lu,    0x252b => hl + hv,
    0x252c => lh  +  ld, 0x252d => [hl, ldr], 0x252e => [hr, ldr], 0x252f => [hh, ld],

    0x2530 => [lh, hd],  0x2531 => [hdl, lr], 0x2532 => [ll, hdr],  0x2533 => [hh, hd],
    0x2534 => [lh, lu],  0x2535 => [lru, hl], 0x2536 => [llu, hr], 0x2537 => [hh, lu],
    0x2538 => [lh, hu],  0x2539 => [hlu, lr], 0x253a => [hru, ll], 0x253b => [hh, hu],
    0x253c => [lv, lh],  0x253d => lv+lr+hl,  0x253e => ll+lv+hr,  0x253f => [lv, hh],

    0x2540 => [lh, ld, hu], 0x2541 => [light_h, light_u, heavy_d], 0x2542 => [heavy_v, light_h], 0x2543 => [heavy_l, heavy_u, hc, light_d, light_r],
    0x2544 => [ll, ld, hru], 0x2545 => [heavy_dl, light_ru], 0x2546 => [light_lu, heavy_dr], 0x2547 => [heavy_h, heavy_u, light_d],
    0x2548 => [hh, hd, light_u], 0x2549 => [heavy_v, heavy_l, light_r], 0x254a => [heavy_v, light_l, heavy_r], 0x254b => [heavy_v, heavy_h],
    0x254c => [lh, dblc], 0x254d => [heavy_h, dblc], 0x254e => [light_v, dblc], 0x254f => [heavy_v, dblc],

    0x2550 => dh, 0x2551 => dv, 0x2552 => [dh, lv, ml, maskdtop], 0x2553 => [dv, lh, mt, maskdleft],
    0x2554 => [ddbar, drbar, mask_dbar, mask_rbar], 0x2555 => [dh, mr, lv, maskdtop],
    0x2556 => [dv, lh,maskdright,mt], 0x2557 => [double_dbar, double_lbar, mask_dbar, mask_lbar],
    0x2558 => [lv, dh, ml,  maskdbottom], 0x2559 => [lh, dv, maskdleft, mb],
    0x255A => [dtbar, double_rbar, mask_tbar, mask_rbar], 0x255B => [dh, lv, maskdbottom, mr],
    0x255C => [dv, lh, mb,  maskdright], 0x255D => [dtbar, dlbar, mask_tbar, mask_lbar],
    0x255e => [lv, dh, maskleft], 0x255f => [lh, dv, dblc, maskdleft],
    0x2560 => [dv, drbar, mask_rbar, mask_vbar], 0x2561 => [lv, dh, maskright],
    0x2562 => [dv, ll, dblc], 0x2563 => [dlbar, dv, mask_lbar, mask_vbar],
    0x2564 => [dh, ld, dblc], 0x2565 => [lh, dv, mt],
    0x2566 => [dh, ddbar,mask_hbar, mask_dbar], 0x2567 => [dh, light_u,dblc],
    0x2568 => [lh, dv, mb],   0x2569 => [dh, double_tbar, mask_hbar, mask_tbar],
    0x256A => dh+lv, 0x256b => dv+lh, 0x256c => [dh, dv, mask_hbar, mask_vbar],

    # 256d, 256e, 256f, 2570 => curves
    # FIXME: Current is just very slightly rounded.
    0x256d => [ldr, mask_c], 0x256e => [ldl, mask_c], 0x256f => [llu, mask_c], 0x2570 => [lru, mask_c],

    # 2571, 2572. 2573 => diagonals, handled below.
    0x2571 => nil, 0x2572 => nil, 0x2573 => nil,

    0x2574 => ll,      0x2575 => lu,      0x2576 => lr,      0x2577 => ld,
    0x2578 => hl,      0x2579 => hu,      0x257a => hr,      0x257b => hd,
    0x257c => ll + hr, 0x257d => lu + hd, 0x257e => hl + lr, 0x257f => hu + ld

  }

  r = rects[ch.ord]
  if r
    img = empty_box_image
    r.flatten.each_slice(5) do |rect|
      p rect
      x1,y1,x2,y2, col = *rect
      x1 = (x1+hx).clamp(0,boxw-1)
      x2 = (x2+hx).clamp(0,boxw-1)
      y1 = (y1+hy).clamp(0,boxh-1)
      y2 = (y2+hy).clamp(0,boxh-1)
      col ||= 255

      a = Array.new(x2-x1+1,col)

      (y1..y2).each do |y|
        img.pixels[y*stride + x1 .. y*stride + x2] = a
      end
    end
    return img
  end

  if ch.ord == 0x2571
    img = empty_box_image
    slope = boxw.to_f / boxh
    x = boxw.to_f-1
    (0...boxh).each do |y|
      err = x - x.to_i
      img.pixels[y*stride+x.ceil] = 255 #(255*(1-err)).floor
      img.pixels[y*stride+x.ceil-1] = (255*err).floor if x > 0
      x-= slope
    end
    return img
  end

  # FIXME: If size is *at* certain levels level, this, and the next one fails?

  if ch.ord == 0x2572
    img = empty_box_image
    slope = boxw.to_f / boxh
    x = boxw.to_f-1
    (0...boxh).each do |y|
      err = x - x.to_i
      img.pixels[y*stride+boxw-x.ceil-1]   = 255
      img.pixels[y*stride+boxw-x.ceil] = (255*err).floor if x > 0
      x-= slope
    end
    return img
  end

  if ch.ord == 0x2573
    img = empty_box_image
    slope = boxw.to_f / boxh
    x = boxw.to_f-1
    (0...boxh).each do |y|
      err = x - x.to_i
      img.pixels[y*stride+boxw-x.ceil-1]   = 255
      img.pixels[y*stride+boxw-x.ceil] = (255*err).floor if x > 0
      img.pixels[y*stride+x.ceil-1] = (255*err).floor if x > 0
      img.pixels[y*stride+x.ceil] = 255 #(255*(1-err)).floor
      x-= slope
    end
    return img
  end

  if img
    img = img.dup
    img.pixels = img.pixels.dup
  end
  img || empty_box_image
end

#empty_box_image ⇒ Object 



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# File 'lib/skrift/x11/boxdrawing.rb', line 5

def empty_box_image
  img = Image.new(stride, boxh)
  img.pixels = Array.new(img.width*img.height,0x00)
  img
end

#fill_for_col(col) ⇒ Object 



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# File 'lib/skrift/x11/glyphs.rb', line 81

def fill_for_col(col)
  return @colcache[col] if @colcache[col]
  r = col >> 16
  r |= r << 8
  g = (col >> 8) & 0xff
  g |= g << 8
  b = col & 0xff
  b |= b << 8
  
  @colcache[col] ||= @dpy.render_create_solid_fill(r,g,b,0xffff)
end

#inspect ⇒ Object 



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# File 'lib/skrift/x11/glyphs.rb', line 36

def inspect
  "<Glyphs #{object_id}"
end

#load_font(index) ⇒ Object 



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# File 'lib/skrift/x11/glyphs.rb', line 21

def load_font(index)
  return @fonts[index] if @fonts[index]
  f = @fontset[index]
  return nil if !f
  return @fonts[index] = Font.load(f) if File.exist?(f)

  # FIXME: Do proper resolution of XDG dirs
  fn = File.expand_path("~/.local/share/fonts/#{f}")
  return @fonts[index] = Font.load(fn) if File.exist?(fn)

  fn = `fc-match --format='%{file}\n' #{fn}`.split("\n").first
  return @fonts[index] = Font.load(fn) if File.exist?(fn)
  return nil
end

#render_str(pic, col, x, y, str) ⇒ Object 



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# File 'lib/skrift/x11/glyphs.rb', line 242

def render_str(pic, col, x,y, str)
  fill = fill_for_col(col)
  gl = cache_glyphs(str)
  @dpy.render_composite_glyphs32(
    :PictOpOver, fill, pic, @gfmt,
    @glyphset, 0,0, [x, y, gl]
  )
end

#text_width(str) ⇒ Object 



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# File 'lib/skrift/x11/glyphs.rb', line 189

def text_width(str)
  # We *presume* that if you call text_width, you intend
  # to render the string. Maybe we shouldn't?
  gl = cache_glyphs(str)
  gl.inject(0) {|sum,gl|
    @glyphcache[gl].to_i + sum
  }
end