K1Guitar/tools/gen_charge_pct_glyphs.py

# -*- coding: utf-8 -*-
"""Generate MiSans-Semibold 0-9/% with shared baseline + matched cap height."""
from pathlib import Path
from PIL import Image, ImageDraw, ImageFont

ROOT = Path(r"C:\Users\qjyu\Documents\SoundWalker\一诺国际吉他")
FONT = next((ROOT / "Doc" / "UI" / "MiSans").rglob("MiSans-Semibold.ttf"))
OUT_C = ROOT / "Code" / "YNGJ-GT1-M - AT32F403ARCT7" / "device" / "LCD_ILI9341" / "Drv_ILI9341_Lcd_Image_ChargePct.c"
OUT_H = ROOT / "Code" / "YNGJ-GT1-M - AT32F403ARCT7" / "device" / "LCD_ILI9341" / "Drv_ILI9341_Lcd_Image_ChargePct.h"
OUT_PREV = ROOT / "Code" / "YNGJ-GT1-M - AT32F403ARCT7" / "tools" / "out" / "_charge_pct_glyphs.png"

H = 20
FONT_PX = 18
WHITE = 0xFFFF
BLACK = 0x0000
TOP_PAD = 1


def render_on_baseline(ch: str, font: ImageFont.FreeTypeFont) -> Image.Image:
    """Render char into HxW with shared baseline = H - 2."""
    ascent, descent = font.getmetrics()
    baseline = H - 2
    # wide scratch
    scratch = Image.new("L", (48, H + 8), 0)
    dr = ImageDraw.Draw(scratch)
    # Pillow text y is top of em-box approx; use anchor if available
    try:
        dr.text((4, baseline), ch, font=font, fill=255, anchor="ls")
    except TypeError:
        dr.text((4, baseline - ascent), ch, font=font, fill=255)
    bbox = scratch.getbbox()
    if bbox is None:
        return Image.new("L", (8, H), 0)
    l, t, r, b = bbox
    # keep full height H strip from y=0..H-1 of scratch (aligned)
    strip = scratch.crop((l, 0, r, H))
    # 1-bit
    bw = strip.point(lambda v: 255 if v >= 140 else 0)
    # add 1px side pad
    out = Image.new("L", (bw.size[0] + 2, H), 0)
    out.paste(bw, (1, 0))
    return out


def to_rgb565_be(im: Image.Image) -> bytes:
    w, h = im.size
    out = bytearray(w * h * 2)
    i = 0
    for y in range(h):
        for x in range(w):
            c = WHITE if im.getpixel((x, y)) else BLACK
            out[i] = (c >> 8) & 0xFF
            out[i + 1] = c & 0xFF
            i += 2
    return bytes(out)


font = ImageFont.truetype(str(FONT), FONT_PX)
chars = list("0123456789%")
glyphs = {ch: render_on_baseline(ch, font) for ch in chars}

# Verify ink y-ranges share baseline
for ch in "50%":
    im = glyphs[ch]
    ys = [y for y in range(im.size[1]) for x in range(im.size[0]) if im.getpixel((x, y))]
    print(ch, "size", im.size, "ink y", min(ys), max(ys))

total_w = sum(glyphs[c].size[0] for c in "50%") + 4
prev = Image.new("L", (total_w, H + 4), 0)
x = 2
for ch in "50%":
    prev.paste(glyphs[ch], (x, 2))
    x += glyphs[ch].size[0]
OUT_PREV.parent.mkdir(parents=True, exist_ok=True)
prev.resize((prev.size[0] * 5, prev.size[1] * 5), Image.NEAREST).save(OUT_PREV)
prev.resize((prev.size[0] * 5, prev.size[1] * 5), Image.NEAREST).save(
    OUT_PREV.with_name("_charge_pct_prev_ascii.png")
)
print("preview", OUT_PREV)

h_lines = [
    "#ifndef __DRV_ILI9341_LCD_IMAGE_CHARGE_PCT_H",
    "#define __DRV_ILI9341_LCD_IMAGE_CHARGE_PCT_H",
    "",
    '#include "stdint.h"',
    "",
    f"#define CHARGE_PCT_GLYPH_H  {H}",
    "",
]
c_lines = [
    '#include "Drv_ILI9341_Lcd_Image_ChargePct.h"',
    "",
    "/* Auto-generated by tools/gen_charge_pct_glyphs.py — MiSans Semibold, shared baseline */",
    "",
]

for ch in chars:
    im = glyphs[ch]
    w, h = im.size
    data = to_rgb565_be(im)
    name = "Pct" if ch == "%" else f"Digit{ch}"
    arr = f"gImage_Charge_{name}_{w}x{h}"
    h_lines.append(f"#define CHARGE_{name.upper()}_W  {w}")
    h_lines.append(f"#define CHARGE_{name.upper()}_H  {h}")
    h_lines.append(f"extern const unsigned char {arr}[{len(data)}];")
    h_lines.append("")
    c_lines.append(f"const unsigned char {arr}[{len(data)}] = {{ /* {w}x{h} RGB565 BE */")
    hexes = [f"0x{b:02X}" for b in data]
    for i in range(0, len(hexes), 16):
        c_lines.append("  " + ",".join(hexes[i : i + 16]) + ",")
    c_lines.append("};")
    c_lines.append("")

h_lines += [
    "typedef struct {",
    "    const unsigned char *data;",
    "    uint8_t w;",
    "    uint8_t h;",
    "} ChargePctGlyph;",
    "",
    "extern const ChargePctGlyph g_ChargePctDigits[10];",
    "extern const ChargePctGlyph g_ChargePctPercent;",
    "",
    "#endif",
    "",
]

c_lines.append("const ChargePctGlyph g_ChargePctDigits[10] = {")
for d in range(10):
    im = glyphs[str(d)]
    w, h = im.size
    c_lines.append(f"    {{ gImage_Charge_Digit{d}_{w}x{h}, {w}, {h} }},")
c_lines.append("};")
c_lines.append("")
im = glyphs["%"]
w, h = im.size
c_lines.append(
    f"const ChargePctGlyph g_ChargePctPercent = {{ gImage_Charge_Pct_{w}x{h}, {w}, {h} }};"
)
c_lines.append("")

OUT_H.write_text("\n".join(h_lines), encoding="utf-8", newline="\n")
OUT_C.write_text("\n".join(c_lines), encoding="utf-8", newline="\n")
print("wrote", OUT_C.stat().st_size, "bytes")