Restore MOTD-style ASCII wallpaper

iso/builder/config/hooks/normal/9001-wallpaper.hook.chroot

@@ -10,20 +10,15 @@ import os
 
 W, H = 1920, 1080
 
-GLYPHS = {
-    'E': ["11111", "10000", "11110", "10000", "10000", "10000", "11111"],
-    'A': ["01110", "10001", "10001", "11111", "10001", "10001", "10001"],
-    'S': ["01111", "10000", "10000", "01110", "00001", "00001", "11110"],
-    'Y': ["10001", "10001", "01010", "00100", "00100", "00100", "00100"],
-    'B': ["11110", "10001", "10001", "11110", "10001", "10001", "11110"],
-    '-': ["00000", "00000", "11111", "00000", "00000", "00000", "00000"],
-}
-
-TITLE = "EASY-BEE"
-SUBTITLE = "Hardware Audit LiveCD"
-CELL = 30
-GLYPH_GAP = 18
-ROW_GAP = 6
+ASCII_ART = [
+    "  ███████╗ █████╗ ███████╗██╗   ██╗      ██████╗ ███████╗███████╗",
+    "  ██╔════╝██╔══██╗██╔════╝╚██╗ ██╔╝      ██╔══██╗██╔════╝██╔════╝",
+    "  █████╗  ███████║███████╗ ╚████╔╝ █████╗██████╔╝█████╗  █████╗",
+    "  ██╔══╝  ██╔══██║╚════██║  ╚██╔╝  ╚════╝██╔══██╗██╔══╝  ██╔══╝",
+    "  ███████╗██║  ██║███████║   ██║         ██████╔╝███████╗███████╗",
+    "  ╚══════╝╚═╝  ╚═╝╚══════╝   ╚═╝         ╚═════╝ ╚══════╝╚══════╝",
+]
+SUBTITLE = "  Hardware Audit LiveCD"
 
 FG = (0xF6, 0xD0, 0x47)
 FG_DIM = (0xD4, 0xA9, 0x1C)
@@ -31,6 +26,12 @@ SHADOW = (0x5E, 0x47, 0x05)
 SUB = (0x96, 0x7A, 0x17)
 BG = (0x05, 0x05, 0x05)
 
+MONO_FONT_CANDIDATES = [
+    '/usr/share/fonts/truetype/dejavu/DejaVuSansMono-Bold.ttf',
+    '/usr/share/fonts/truetype/liberation2/LiberationMono-Bold.ttf',
+    '/usr/share/fonts/truetype/liberation/LiberationMono-Bold.ttf',
+    '/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf',
+]
 SUB_FONT_CANDIDATES = [
     '/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf',
     '/usr/share/fonts/truetype/liberation2/LiberationSans-Bold.ttf',
@@ -39,43 +40,34 @@ SUB_FONT_CANDIDATES = [
 ]
 
 
-def load_font(size):
-    for path in SUB_FONT_CANDIDATES:
+def load_font(candidates, size):
+    for path in candidates:
         if os.path.exists(path):
             return ImageFont.truetype(path, size)
     return ImageFont.load_default()
 
 
-def glyph_width(ch):
-    return len(GLYPHS[ch][0])
+def mono_metrics(font):
+    probe = Image.new('L', (W, H), 0)
+    draw = ImageDraw.Draw(probe)
+    char_w = int(round(draw.textlength("M", font=font)))
+    bb = draw.textbbox((0, 0), "Mg", font=font)
+    char_h = bb[3] - bb[1]
+    return char_w, char_h
 
 
-def render_logo_mask():
-    width_cells = 0
-    for idx, ch in enumerate(TITLE):
-        width_cells += glyph_width(ch)
-        if idx != len(TITLE) - 1:
-            width_cells += 1
-    mask_w = width_cells * CELL + (len(TITLE) - 1) * GLYPH_GAP
-    mask_h = 7 * CELL + 6 * ROW_GAP
-    mask = Image.new('L', (mask_w, mask_h), 0)
+def render_ascii_mask(font, lines, char_w, char_h, line_gap):
+    width = max(len(line) for line in lines) * char_w
+    height = len(lines) * char_h + line_gap * (len(lines) - 1)
+    mask = Image.new('L', (width, height), 0)
     draw = ImageDraw.Draw(mask)
-
-    cx = 0
-    for idx, ch in enumerate(TITLE):
-        glyph = GLYPHS[ch]
-        for row_idx, row in enumerate(glyph):
-            for col_idx, cell in enumerate(row):
-                if cell != '1':
+    for row, line in enumerate(lines):
+        y = row * (char_h + line_gap)
+        for col, ch in enumerate(line):
+            if ch == ' ':
                 continue
-                x0 = cx + col_idx * CELL
-                y0 = row_idx * (CELL + ROW_GAP)
-                x1 = x0 + CELL - 4
-                y1 = y0 + CELL - 4
-                draw.rounded_rectangle((x0, y0, x1, y1), radius=4, fill=255)
-        cx += glyph_width(ch) * CELL
-        if idx != len(TITLE) - 1:
-            cx += CELL + GLYPH_GAP
+            x = col * char_w
+            draw.text((x, y), ch, font=font, fill=255)
     return mask
 
 
@@ -90,20 +82,22 @@ glow_draw.ellipse((520, 340, 1400, 760), fill=(255, 190, 40, 36))
 glow = glow.filter(ImageFilter.GaussianBlur(60))
 img = Image.alpha_composite(img.convert('RGBA'), glow)
 
-logo_mask = render_logo_mask()
+font_logo = load_font(MONO_FONT_CANDIDATES, 64)
+char_w, char_h = mono_metrics(font_logo)
+logo_mask = render_ascii_mask(font_logo, ASCII_ART, char_w, char_h, 8)
 logo_w, logo_h = logo_mask.size
 logo_x = (W - logo_w) // 2
-logo_y = 290
+logo_y = 270
 
 shadow_mask = logo_mask.filter(ImageFilter.GaussianBlur(2))
 img.paste(SHADOW, (logo_x + 16, logo_y + 14), shadow_mask)
 img.paste(FG_DIM, (logo_x + 8, logo_y + 7), logo_mask)
 img.paste(FG, (logo_x, logo_y), logo_mask)
 
-font_sub = load_font(30)
+font_sub = load_font(SUB_FONT_CANDIDATES, 30)
 sub_bb = draw.textbbox((0, 0), SUBTITLE, font=font_sub)
 sub_x = (W - (sub_bb[2] - sub_bb[0])) // 2
-sub_y = logo_y + logo_h + 54
+sub_y = logo_y + logo_h + 48
 draw = ImageDraw.Draw(img)
 draw.text((sub_x + 2, sub_y + 2), SUBTITLE, font=font_sub, fill=(35, 28, 6))
 draw.text((sub_x, sub_y), SUBTITLE, font=font_sub, fill=SUB)