mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-29 17:48:10 +00:00
116 lines
4.6 KiB
Python
Executable File
116 lines
4.6 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
# script used to generate /embed/extmod/modtrezorui/font_*_*.c
|
|
|
|
|
|
import freetype
|
|
|
|
MIN_GLYPH = ord(" ")
|
|
MAX_GLYPH = ord("~")
|
|
|
|
FONT_BPP = 4
|
|
|
|
# metrics explanation: https://www.freetype.org/freetype2/docs/glyphs/metrics.png
|
|
|
|
|
|
def process_face(name, style, size):
|
|
print("Processing ... %s %s %s" % (name, style, size))
|
|
face = freetype.Face("/usr/share/fonts/truetype/%s-%s.ttf" % (name, style))
|
|
face.set_pixel_sizes(0, size)
|
|
fontname = "%s_%s_%d" % (name.lower(), style.lower(), size)
|
|
with open("font_%s.h" % fontname, "wt") as f:
|
|
f.write("#include <stdint.h>\n\n")
|
|
f.write(
|
|
"extern const uint8_t* const Font_%s_%s_%d[%d + 1 - %d];\n"
|
|
% (name, style, size, MAX_GLYPH, MIN_GLYPH)
|
|
)
|
|
with open("font_%s.c" % fontname, "wt") as f:
|
|
f.write('#include "font_%s.h"\n\n' % fontname)
|
|
f.write("// first two bytes are width and height of the glyph\n")
|
|
f.write("// third, fourth and fifth bytes are advance\n")
|
|
f.write("// bearingX and bearingY of the horizontal metrics of the glyph\n")
|
|
f.write("// rest is packed 4-bit glyph data\n\n")
|
|
f.write("// clang-format off\n\n")
|
|
for i in range(MIN_GLYPH, MAX_GLYPH + 1):
|
|
c = chr(i)
|
|
face.load_char(c, freetype.FT_LOAD_RENDER | freetype.FT_LOAD_TARGET_NORMAL)
|
|
bitmap = face.glyph.bitmap
|
|
metrics = face.glyph.metrics
|
|
assert metrics.width // 64 == bitmap.width
|
|
assert metrics.height // 64 == bitmap.rows
|
|
assert metrics.width % 64 == 0
|
|
assert metrics.height % 64 == 0
|
|
assert metrics.horiAdvance % 64 == 0
|
|
assert metrics.horiBearingX % 64 == 0
|
|
assert metrics.horiBearingY % 64 == 0
|
|
assert bitmap.width == bitmap.pitch
|
|
assert len(bitmap.buffer) == bitmap.pitch * bitmap.rows
|
|
width = bitmap.width
|
|
rows = bitmap.rows
|
|
advance = metrics.horiAdvance // 64
|
|
bearingX = metrics.horiBearingX // 64
|
|
# the following code is here just for some letters (listed below)
|
|
# not using negative bearingX makes life so much easier; add it to advance instead
|
|
if c in "jy}),/" and bearingX < 0:
|
|
advance += -bearingX
|
|
bearingX = 0
|
|
bearingY = metrics.horiBearingY // 64
|
|
assert advance >= 0 and advance <= 255
|
|
assert bearingX >= 0 and bearingX <= 255
|
|
assert bearingY >= 0 and bearingY <= 255
|
|
print(
|
|
'Loaded glyph "%c" ... %d x %d @ %d grays (%d bytes, metrics: %d, %d, %d)'
|
|
% (
|
|
c,
|
|
bitmap.width,
|
|
bitmap.rows,
|
|
bitmap.num_grays,
|
|
len(bitmap.buffer),
|
|
advance,
|
|
bearingX,
|
|
bearingY,
|
|
)
|
|
)
|
|
f.write(
|
|
"/* %c */ static const uint8_t Font_%s_%s_%d_glyph_%d[] = { %d, %d, %d, %d, %d"
|
|
% (c, name, style, size, i, width, rows, advance, bearingX, bearingY)
|
|
)
|
|
buf = list(bitmap.buffer)
|
|
if len(buf) > 0:
|
|
if FONT_BPP == 2:
|
|
for _ in range(4 - len(buf) % 4):
|
|
buf.append(0)
|
|
buf = [
|
|
(
|
|
(a & 0xC0)
|
|
| ((b & 0xC0) >> 2)
|
|
| ((c & 0xC0) >> 4)
|
|
| ((d & 0xC0) >> 6)
|
|
)
|
|
for a, b, c, d in [
|
|
buf[i : i + 4] for i in range(0, len(buf), 4)
|
|
]
|
|
]
|
|
elif FONT_BPP == 4:
|
|
if len(buf) % 2 > 0:
|
|
buf.append(0)
|
|
buf = [
|
|
((a & 0xF0) | (b >> 4))
|
|
for a, b in [buf[i : i + 2] for i in range(0, len(buf), 2)]
|
|
]
|
|
f.write(", " + ", ".join(["%d" % x for x in buf]))
|
|
f.write(" };\n")
|
|
f.write(
|
|
"\nconst uint8_t * const Font_%s_%s_%d[%d + 1 - %d] = {\n"
|
|
% (name, style, size, MAX_GLYPH, MIN_GLYPH)
|
|
)
|
|
for i in range(MIN_GLYPH, MAX_GLYPH + 1):
|
|
f.write(" Font_%s_%s_%d_glyph_%d,\n" % (name, style, size, i))
|
|
f.write("};\n")
|
|
|
|
|
|
process_face("Roboto", "Regular", 20)
|
|
process_face("Roboto", "Bold", 20)
|
|
process_face("RobotoMono", "Regular", 20)
|
|
process_face("RobotoMono", "Bold", 20)
|