explanations for CP437 translations, some cleanups, bugfix for drawString
* explanation for CP437 glyph groups * translation for MonnModules symbol * "smiley" replacement for 4-bytes and overlong unicode codes * always compile unicodetool.cpp (codepage translation still depends on WLED_ENABLE_UNICODE) * bugfix: DrawString now skips over glyphs that would be rejected by DrawCharacter * minor cleanup
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Frank
@@ -1,5 +1,12 @@
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#if defined(WLED_ENABLE_FULL_FONTS)
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/*
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@title WLED(-MM) - unicode to CP437 conversion
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@repo https://github.com/MoonModules/WLED-MM, https://github.com/wled/WLED
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@Copyright © 2025 Github WLED and WLED-MM Commit Authors (see "git blame" for details)
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@license Licensed under the EUPL-1.2 or later
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*/
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#include "codepages.h"
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#include <string.h>
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@@ -9,11 +16,18 @@ constexpr uint8_t CP437_UNKNOWN = 250; // small middle dot · // not sure if we
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// based on a table from https://en.wikipedia.org/wiki/Code_page_437#Character_set
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uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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// codes up to 126 are same as ASCII
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if (wideChar < 127) return wideChar;
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// unicode codes 0 up to 127 are same as ASCII -> pass through
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if ((wideChar < 0x7F) && (wideChar != 0x08)) return wideChar; // excludes 127 = DEL and 8 = BS, so we can map them
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switch (wideChar) {
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// characters 1 - 31
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// original IBM PC would interpret codes 0x07, 0x08, 0x0A, and 0x0D as BEL, BS, LF, and CR, respectively.
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// we don't implement any special handling at the moment
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case 0x0008: return 0x08; break; // Backspace: pass through (could be handled differently in future)
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// unicode codes mapped to characters 1 - 31
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// unicode 0 = C string terminator -> already passed through, never map it !!
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// 1 to 31 (0x01 to 0x1F) are "assorted dingbats" (complementary and decorative characters).
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// The isolated character 127 (7Fhex) also belongs to this group.
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case 0x263A: return 0x01; break; // ☺︎
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case 0x263B: return 0x02; break; // ☻
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case 0x2665: return 0x03; break; // ♥︎
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@@ -46,8 +60,13 @@ uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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case 0x25B2: return 0x1E; break; // ▲
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case 0x25BC: return 0x1F; break; // ▼
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// characters 127 - 254
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case 0x2302: return 0x7F; break; // ⌂ (aka DEL)
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// unicode codes 32 to 126 (0x20 to 0x7E) are the standard ASCII printable characters -> already passed through
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// unicode codes mapped to characters 127 - 254
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// code 127 DEL -> small arrow back. We don't implement legacy "rubout" or "backspace" for composing letters or for bold printing
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case 0x007F: return 0x1B; break; // ←
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case 0x2302: return 0x7F; break; // ⌂
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// 128 to 175 (0x80 to 0xAF) are a selection of international text characters
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case 0x00C7: return 0x80; break; // Ç
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case 0x00FC: return 0x81; break; // ü
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case 0x00E9: return 0x82; break; // é
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@@ -96,6 +115,7 @@ uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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case 0x00A1: return 0xAD; break; // ¡
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case 0x00AB: return 0xAE; break; // «
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case 0x00BB: return 0xAF; break; // »
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// 176 to 223 (0xB0 to 0xDF) are box drawing and block characters
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case 0x2591: return 0xB0; break; // ░
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case 0x2592: return 0xB1; break; // ▒
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case 0x2593: return 0xB2; break; // ▓
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@@ -144,6 +164,7 @@ uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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case 0x258C: return 0xDD; break; // ▌
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case 0x2590: return 0xDE; break; // ▐
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case 0x2580: return 0xDF; break; // ▀
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// 224 to 235 (0xE0 to 0xEB) are math symbols part 1 - Greek letters commonly used in physics
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case 0x03B1: return 0xE0; break; // α
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case 0x00DF: return 0xE1; break; // ß
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case 0x0393: return 0xE2; break; // Γ
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@@ -156,6 +177,7 @@ uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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case 0x0398: return 0xE9; break; // Θ
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case 0x03A9: return 0xEA; break; // Ω
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case 0x03B4: return 0xEB; break; // δ
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// 236 to 254 (0xEC to 0xFE) are other common physics and math symbols
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case 0x221E: return 0xEC; break; // ∞
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case 0x03C6: return 0xED; break; // φ
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case 0x03B5: return 0xEE; break; // ε
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@@ -174,14 +196,16 @@ uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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case 0x221A: return 0xFB; break; // √
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case 0x207F: return 0xFC; break; // ⁿ
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case 0x00B2: return 0xFD; break; // ²
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case 0x25A0: return 0xFE; break; // ■
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case 0x25A0: return 0xFE; break; // ■ geometric shapes
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// 255 (0xFF) is "non breakable space" (NBSP)
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case 0x00A0: return 32; break; // NBSP -> normal "space"
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// special mappings for very similar characters
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case 0x00A6: return 0x7C; break; // broken bar -> bar
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case 0x266C: return 14; break; // musical notes
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case 0x0394: return 127; break; // greek capital delta Δ
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// special mappings for very similar unicode characters
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case 0x00A6: return 0x7C; break; // ¦ broken bar -> | bar
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case 0x266C: return 14; break; // musical note ♬ -> ♫
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case 0x0394: return 127; break; // greek capital delta Δ -> ⌂
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case 0x23AE: return 179; break; // integral extension ⎮
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case 0x03B2: return 225; break; // greek small beta β => sz umlaut ß
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case 0x03B2: return 225; break; // greek small beta β -> sz umlaut ß
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case 0x03A0: return 227; break; // greek capital PI Π
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case 0x220F: return 227; break; // math product ∏
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case 0x2211: return 228; break; // math sum ∑
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@@ -194,13 +218,13 @@ uint16_t wchar16ToCodepage437(uint16_t wideChar) {
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case 0x2300: return 237; break; // diameter ⌀
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case 0x00D8: return 237; break; // 0 strikethrough Ø
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case 0x00F8: return 237; break; // 0 strikethrough small ø
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case 0x02DA: return 0xF8; break; // small circle (up) ˚
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case 0x2208: return 238; break; // element-of ∈
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case 0x017F: return 244; break; // long S ſ
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case 0x02DA: return 0xF8; break; // small circle (up) ˚
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case 0x00A0: return 32; break; // NBSP => blank
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case 0x20AC: return 238; break; // Euro €
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case 0x2713: return 251; break; // check mark ✓
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case 0x2208: return 238; break; // element-of ∈ -> ε
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case 0x20AC: return 238; break; // Euro € -> ε
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case 0x2713: return 251; break; // check mark ✓ -> √
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case 0x263E: return 0x01; break; // ☾ last quarter moon (Moonmodules) -> ☺︎ face
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// everything else: unknown
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//default: return 32; // blank
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