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annotate semiconginev2/old/resources/font.nim @ 1218:56781cc0fc7c compiletime-tests

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did: renamge main package
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 21:01:37 +0700
parents semicongine/old/resources/font.nim@a3eb305bcac2
children
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1 import std/tables
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2 import std/strutils
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3 import std/strformat
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4 import std/streams
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5 import std/os
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6 import std/unicode
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7 import std/logging
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8
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9 import ../core/vector
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10 import ../core/imagetypes
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11 import ../core/fonttypes
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12 import ../algorithms
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13
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14 {.emit: "#define STBTT_STATIC".}
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15 {.emit: "#define STB_TRUETYPE_IMPLEMENTATION".}
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16 {.emit: "#include \"" & currentSourcePath.parentDir() & "/stb_truetype.h\"".}
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17
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18 type stbtt_fontinfo {.importc, incompleteStruct.} = object
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19
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20 proc stbtt_InitFont(info: ptr stbtt_fontinfo, data: ptr char, offset: cint): cint {.importc, nodecl.}
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21 proc stbtt_ScaleForPixelHeight(info: ptr stbtt_fontinfo, pixels: cfloat): cfloat {.importc, nodecl.}
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22
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23 proc stbtt_GetCodepointBitmap(info: ptr stbtt_fontinfo, scale_x: cfloat, scale_y: cfloat, codepoint: cint, width, height, xoff, yoff: ptr cint): cstring {.importc, nodecl.}
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24 # proc stbtt_GetCodepointBitmapBox(info: ptr stbtt_fontinfo, codepoint: cint, scale_x, scale_y: cfloat, ix0, iy0, ix1, iy1: ptr cint) {.importc, nodecl.}
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25
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26 proc stbtt_GetCodepointHMetrics(info: ptr stbtt_fontinfo, codepoint: cint, advance, leftBearing: ptr cint) {.importc, nodecl.}
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27 proc stbtt_GetCodepointKernAdvance(info: ptr stbtt_fontinfo, ch1, ch2: cint): cint {.importc, nodecl.}
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28 proc stbtt_FindGlyphIndex(info: ptr stbtt_fontinfo, codepoint: cint): cint {.importc, nodecl.}
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29
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30 proc stbtt_GetFontVMetrics(info: ptr stbtt_fontinfo, ascent, descent, lineGap: ptr cint) {.importc, nodecl.}
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31
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32 proc free(p: pointer) {.importc.}
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33
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34 proc ReadTrueType*(stream: Stream, name: string, codePoints: seq[Rune], lineHeightPixels: float32): Font =
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35 var
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36 indata = stream.readAll()
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37 fontinfo: stbtt_fontinfo
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38 if stbtt_InitFont(addr fontinfo, addr indata[0], 0) == 0:
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39 raise newException(Exception, "An error occured while loading PNG file")
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40
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41 result.name = name
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42 result.fontscale = float32(stbtt_ScaleForPixelHeight(addr fontinfo, cfloat(lineHeightPixels)))
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43
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44 var ascent, descent, lineGap: cint
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45 stbtt_GetFontVMetrics(addr fontinfo, addr ascent, addr descent, addr lineGap)
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46
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47 result.lineHeight = float32(ascent - descent) * result.fontscale
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48 result.lineAdvance = float32(ascent - descent + lineGap) * result.fontscale
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49
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50 # ensure all codepoints are available in the font
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51 for codePoint in codePoints:
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52 if stbtt_FindGlyphIndex(addr fontinfo, cint(codePoint)) == 0:
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53 warn &"Loading font {name}: Codepoint '{codePoint}' ({cint(codePoint)}) has no glyph"
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54
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55 var
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56 topOffsets: Table[Rune, int]
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57 images: seq[Image[GrayPixel]]
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58 let empty_image = NewImage[GrayPixel](1, 1, [0'u8])
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59
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60 for codePoint in codePoints:
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61 var
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62 width, height: cint
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63 offX, offY: cint
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64 let
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65 data = stbtt_GetCodepointBitmap(
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66 addr fontinfo,
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67 result.fontscale,
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68 result.fontscale,
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69 cint(codePoint),
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70 addr width, addr height,
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71 addr offX, addr offY
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72 )
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73 topOffsets[codePoint] = offY
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74
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75 if char(codePoint) in UppercaseLetters:
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76 result.capHeight = float32(height)
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77 if codePoint == Rune('x'):
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78 result.xHeight = float32(height)
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79
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80 if width > 0 and height > 0:
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81 var bitmap = newSeq[GrayPixel](width * height)
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82 for i in 0 ..< width * height:
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83 bitmap[i] = GrayPixel(data[i])
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84 images.add NewImage[GrayPixel](width.uint32, height.uint32, bitmap)
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85 else:
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86 images.add empty_image
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87
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88 free(data)
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89
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90 let packed = Pack(images)
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91
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92 result.fontAtlas = Texture(
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93 name: name & "_texture",
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94 isGrayscale: true,
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95 grayImage: packed.atlas,
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96 sampler: FONTSAMPLER_SOFT,
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97 )
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98
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99 let w = float32(packed.atlas.width)
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100 let h = float32(packed.atlas.height)
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101 for i in 0 ..< codePoints.len:
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102 let
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103 codePoint = codePoints[i]
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104 image = images[i]
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105 coord = (x: float32(packed.coords[i].x), y: float32(packed.coords[i].y))
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106 iw = float32(image.width)
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107 ih = float32(image.height)
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108 # horizontal spaces:
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109 var advance, leftBearing: cint
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110 stbtt_GetCodepointHMetrics(addr fontinfo, cint(codePoint), addr advance, addr leftBearing)
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111
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112 result.glyphs[codePoint] = GlyphInfo(
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113 dimension: NewVec2f(float32(image.width), float32(image.height)),
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114 uvs: [
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115 NewVec2f((coord.x + 0.5) / w, (coord.y + ih - 0.5) / h),
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116 NewVec2f((coord.x + 0.5) / w, (coord.y + 0.5) / h),
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117 NewVec2f((coord.x + iw - 0.5) / w, (coord.y + 0.5) / h),
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118 NewVec2f((coord.x + iw - 0.5) / w, (coord.y + ih - 0.5) / h),
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119 ],
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120 topOffset: float32(topOffsets[codePoint]),
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121 leftOffset: float32(leftBearing) * result.fontscale,
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122 advance: float32(advance) * result.fontscale,
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123 )
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124
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125 for codePointAfter in codePoints:
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126 result.kerning[(codePoint, codePointAfter)] = float32(stbtt_GetCodepointKernAdvance(
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127 addr fontinfo,
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128 cint(codePoint),
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129 cint(codePointAfter)
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130 )) * result.fontscale