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129 lines
4.9 KiB
129 lines
4.9 KiB
#!/usr/bin/env python3
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# script used to generate /embed/extmod/modtrezorui/font_*_*.c
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import freetype
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MIN_GLYPH = ord(" ")
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MAX_GLYPH = ord("~")
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FONT_BPP = 4
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# metrics explanation: https://www.freetype.org/freetype2/docs/glyphs/metrics.png
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def process_bitmap_buffer(buf):
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res = buf[:]
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if FONT_BPP == 2:
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for _ in range(4 - len(res) % 4):
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res.append(0)
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res = [
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((a & 0xC0) | ((b & 0xC0) >> 2) | ((c & 0xC0) >> 4) | ((d & 0xC0) >> 6))
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for a, b, c, d in [res[i : i + 4] for i in range(0, len(res), 4)]
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]
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elif FONT_BPP == 4:
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if len(res) % 2 > 0:
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res.append(0)
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res = [
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((a & 0xF0) | (b >> 4))
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for a, b in [res[i : i + 2] for i in range(0, len(res), 2)]
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]
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return res
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def process_face(dirprefix, name, style, size):
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print("Processing ... %s %s %s" % (name, style, size))
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face = freetype.Face("%s/share/fonts/truetype/%s-%s.ttf" % (dirprefix, name, style))
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face.set_pixel_sizes(0, size)
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fontname = "%s_%s_%d" % (name.lower(), style.lower(), size)
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with open("font_%s.h" % fontname, "wt") as f:
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f.write("#include <stdint.h>\n\n")
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f.write(
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"extern const uint8_t* const Font_%s_%s_%d[%d + 1 - %d];\n"
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"extern const uint8_t Font_%s_%s_%d_glyph_nonprintable[];\n"
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% (name, style, size, MAX_GLYPH, MIN_GLYPH, name, style, size)
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)
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with open("font_%s.c" % fontname, "wt") as f:
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f.write('#include "font_%s.h"\n\n' % fontname)
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f.write("// first two bytes are width and height of the glyph\n")
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f.write("// third, fourth and fifth bytes are advance\n")
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f.write("// bearingX and bearingY of the horizontal metrics of the glyph\n")
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f.write("// rest is packed 4-bit glyph data\n\n")
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f.write("// clang-format off\n\n")
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for i in range(MIN_GLYPH, MAX_GLYPH + 1):
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c = chr(i)
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face.load_char(c, freetype.FT_LOAD_RENDER | freetype.FT_LOAD_TARGET_NORMAL)
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bitmap = face.glyph.bitmap
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metrics = face.glyph.metrics
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assert metrics.width // 64 == bitmap.width
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assert metrics.height // 64 == bitmap.rows
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assert metrics.width % 64 == 0
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assert metrics.height % 64 == 0
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assert metrics.horiAdvance % 64 == 0
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assert metrics.horiBearingX % 64 == 0
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assert metrics.horiBearingY % 64 == 0
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assert bitmap.width == bitmap.pitch
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assert len(bitmap.buffer) == bitmap.pitch * bitmap.rows
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width = bitmap.width
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rows = bitmap.rows
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advance = metrics.horiAdvance // 64
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bearingX = metrics.horiBearingX // 64
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# the following code is here just for some letters (listed below)
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# not using negative bearingX makes life so much easier; add it to advance instead
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if c in "jy}),/" and bearingX < 0:
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advance += -bearingX
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bearingX = 0
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bearingY = metrics.horiBearingY // 64
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assert advance >= 0 and advance <= 255
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assert bearingX >= 0 and bearingX <= 255
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assert bearingY >= 0 and bearingY <= 255
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print(
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'Loaded glyph "%c" ... %d x %d @ %d grays (%d bytes, metrics: %d, %d, %d)'
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% (
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c,
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bitmap.width,
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bitmap.rows,
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bitmap.num_grays,
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len(bitmap.buffer),
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advance,
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bearingX,
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bearingY,
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)
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)
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f.write(
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"/* %c */ static const uint8_t Font_%s_%s_%d_glyph_%d[] = { %d, %d, %d, %d, %d"
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% (c, name, style, size, i, width, rows, advance, bearingX, bearingY)
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)
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buf = list(bitmap.buffer)
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if len(buf) > 0:
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f.write(
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", " + ", ".join(["%d" % x for x in process_bitmap_buffer(buf)])
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)
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f.write(" };\n")
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if i == ord("?"):
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nonprintable = (
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"\nconst uint8_t Font_%s_%s_%d_glyph_nonprintable[] = { %d, %d, %d, %d, %d"
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% (name, style, size, width, rows, advance, bearingX, bearingY)
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)
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nonprintable += ", " + ", ".join(
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["%d" % (x ^ 0xFF) for x in process_bitmap_buffer(buf)]
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)
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nonprintable += " };\n"
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f.write(nonprintable)
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f.write(
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"\nconst uint8_t * const Font_%s_%s_%d[%d + 1 - %d] = {\n"
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% (name, style, size, MAX_GLYPH, MIN_GLYPH)
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)
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for i in range(MIN_GLYPH, MAX_GLYPH + 1):
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f.write(" Font_%s_%s_%d_glyph_%d,\n" % (name, style, size, i))
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f.write("};\n")
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process_face("/usr", "Roboto", "Regular", 20)
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process_face("/usr", "Roboto", "Bold", 20)
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process_face("/usr", "RobotoMono", "Regular", 20)
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