先看效果

直接上代码

// *********************************************
// FileName: text_overlay.hpp
// Brief:
//
// Date:   8 Aug. 2025
// Author: ...
// *********************************************#ifndef TEXT_OVERLAY_HPP
#define TEXT_OVERLAY_HPP#include <cstdint>
#include <algorithm>
#include <cstdio>
#include <cstring>namespace OVERLAY {
enum class PixFmt { YUV_NV12, RGB24 };/* ---------- 1. 8×8 字模表（ASCII） ---------- */
// https://github.com/dhepper/font8x8
const uint8_t font8x8_ib8x8u[224][8] = {// ---------------------------  0-127 ---------------------------{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},  // 0000 (uni0000.dup1){0x7e, 0x81, 0xa5, 0x81, 0xbd, 0x99, 0x81, 0x7e},  // 0001 (uni0001){0x7e, 0xff, 0xdb, 0xff, 0xc3, 0xe7, 0xff, 0x7e},  // 0002 (uni0002){0x6c, 0xfe, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00},  // 0003 (uni0003){0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00},  // 0004 (uni0004){0x38, 0x7c, 0x38, 0xfe, 0xfe, 0x7c, 0x38, 0x7c},  // 0005 (uni0005){0x10, 0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x7c},  // 0006 (uni0006){0x00, 0x00, 0x18, 0x3c, 0x3c, 0x18, 0x00, 0x00},  // 0007 (uni0007){0xff, 0xff, 0xe7, 0xc3, 0xc3, 0xe7, 0xff, 0xff},  // 0008 (uni0008){0x00, 0x3c, 0x66, 0x42, 0x42, 0x66, 0x3c, 0x00},  // 0009 (uni0009){0xff, 0xc3, 0x99, 0xbd, 0xbd, 0x99, 0xc3, 0xff},  // 000a (uni000A){0x0f, 0x07, 0x0f, 0x7d, 0xcc, 0xcc, 0xcc, 0x78},  // 000b (uni000B){0x3c, 0x66, 0x66, 0x66, 0x3c, 0x18, 0x7e, 0x18},  // 000c (uni000C){0x3f, 0x33, 0x3f, 0x30, 0x30, 0x70, 0xf0, 0xe0},  // 000d (uni000D){0x7f, 0x63, 0x7f, 0x63, 0x63, 0x67, 0xe6, 0xc0},  // 000e (uni000E){0x99, 0x5a, 0x3c, 0xe7, 0xe7, 0x3c, 0x5a, 0x99},  // 000f (uni000F){0x80, 0xe0, 0xf8, 0xfe, 0xf8, 0xe0, 0x80, 0x00},  // 0010 (uni0010){0x02, 0x0e, 0x3e, 0xfe, 0x3e, 0x0e, 0x02, 0x00},  // 0011 (uni0011){0x18, 0x3c, 0x7e, 0x18, 0x18, 0x7e, 0x3c, 0x18},  // 0012 (uni0012){0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x00},  // 0013 (uni0013){0x7f, 0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x00},  // 0014 (uni0014){0x3e, 0x63, 0x38, 0x6c, 0x6c, 0x38, 0xcc, 0x78},  // 0015 (uni0015){0x00, 0x00, 0x00, 0x00, 0x7e, 0x7e, 0x7e, 0x00},  // 0016 (uni0016){0x18, 0x3c, 0x7e, 0x18, 0x7e, 0x3c, 0x18, 0xff},  // 0017 (uni0017){0x18, 0x3c, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x00},  // 0018 (uni0018){0x18, 0x18, 0x18, 0x18, 0x7e, 0x3c, 0x18, 0x00},  // 0019 (uni0019){0x00, 0x18, 0x0c, 0xfe, 0x0c, 0x18, 0x00, 0x00},  // 001a (uni001A){0x00, 0x30, 0x60, 0xfe, 0x60, 0x30, 0x00, 0x00},  // 001b (uni001B){0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xfe, 0x00, 0x00},  // 001c (uni001C){0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00},  // 001d (uni001D){0x00, 0x18, 0x3c, 0x7e, 0xff, 0xff, 0x00, 0x00},  // 001e (uni001E){0x00, 0xff, 0xff, 0x7e, 0x3c, 0x18, 0x00, 0x00},  // 001f (uni001F){0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},  // 0020 (space){0x30, 0x78, 0x78, 0x30, 0x30, 0x00, 0x30, 0x00},  // 0021 (exclam){0x6c, 0x6c, 0x6c, 0x00, 0x00, 0x00, 0x00, 0x00},  // 0022 (quotedbl){0x6c, 0x6c, 0xfe, 0x6c, 0xfe, 0x6c, 0x6c, 0x00},  // 0023 (numbersign){0x30, 0x7c, 0xc0, 0x78, 0x0c, 0xf8, 0x30, 0x00},  // 0024 (dollar){0x00, 0xc6, 0xcc, 0x18, 0x30, 0x66, 0xc6, 0x00},  // 0025 (percent){0x38, 0x6c, 0x38, 0x76, 0xdc, 0xcc, 0x76, 0x00},  // 0026 (ampersand){0x60, 0x60, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00},  // 0027 (quotesingle){0x18, 0x30, 0x60, 0x60, 0x60, 0x30, 0x18, 0x00},  // 0028 (parenleft){0x60, 0x30, 0x18, 0x18, 0x18, 0x30, 0x60, 0x00},  // 0029 (parenright){0x00, 0x66, 0x3c, 0xff, 0x3c, 0x66, 0x00, 0x00},  // 002a (asterisk){0x00, 0x30, 0x30, 0xfc, 0x30, 0x30, 0x00, 0x00},  // 002b (plus){0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x60},  // 002c (comma){0x00, 0x00, 0x00, 0xfc, 0x00, 0x00, 0x00, 0x00},  // 002d (hyphen){0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x30, 0x00},  // 002e (period){0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x80, 0x00},  // 002f (slash){0x7c, 0xc6, 0xce, 0xde, 0xf6, 0xe6, 0x7c, 0x00},  // 0030 (zero){0x30, 0x70, 0x30, 0x30, 0x30, 0x30, 0xfc, 0x00},  // 0031 (one){0x78, 0xcc, 0x0c, 0x38, 0x60, 0xc4, 0xfc, 0x00},  // 0032 (two){0x78, 0xcc, 0x0c, 0x38, 0x0c, 0xcc, 0x78, 0x00},  // 0033 (three){0x1c, 0x3c, 0x6c, 0xcc, 0xfe, 0x0c, 0x1e, 0x00},  // 0034 (four){0xfc, 0xc0, 0xf8, 0x0c, 0x0c, 0xcc, 0x78, 0x00},  // 0035 (five){0x38, 0x60, 0xc0, 0xf8, 0xcc, 0xcc, 0x78, 0x00},  // 0036 (six){0xfc, 0xcc, 0x0c, 0x18, 0x30, 0x30, 0x30, 0x00},  // 0037 (seven){0x78, 0xcc, 0xcc, 0x78, 0xcc, 0xcc, 0x78, 0x00},  // 0038 (eight){0x78, 0xcc, 0xcc, 0x7c, 0x0c, 0x18, 0x70, 0x00},  // 0039 (nine){0x00, 0x30, 0x30, 0x00, 0x00, 0x30, 0x30, 0x00},  // 003a (colon){0x00, 0x30, 0x30, 0x00, 0x30, 0x30, 0x60, 0x00},  // 003b (semicolon){0x18, 0x30, 0x60, 0xc0, 0x60, 0x30, 0x18, 0x00},  // 003c (less){0x00, 0x00, 0xfc, 0x00, 0x00, 0xfc, 0x00, 0x00},  // 003d (equal){0x60, 0x30, 0x18, 0x0c, 0x18, 0x30, 0x60, 0x00},  // 003e (greater){0x78, 0xcc, 0x0c, 0x18, 0x30, 0x00, 0x30, 0x00},  // 003f (question){0x7c, 0xc6, 0xde, 0xde, 0xde, 0xc0, 0x78, 0x00},  // 0040 (at){0x30, 0x78, 0xcc, 0xcc, 0xfc, 0xcc, 0xcc, 0x00},  // 0041 (A){0xfc, 0x66, 0x66, 0x7c, 0x66, 0x66, 0xfc, 0x00},  // 0042 (B){0x3c, 0x66, 0xc0, 0xc0, 0xc0, 0x66, 0x3c, 0x00},  // 0043 (C){0xf8, 0x6c, 0x66, 0x66, 0x66, 0x6c, 0xf8, 0x00},  // 0044 (D){0xfe, 0x62, 0x68, 0x78, 0x68, 0x62, 0xfe, 0x00},  // 0045 (E){0xfe, 0x62, 0x68, 0x78, 0x68, 0x60, 0xf0, 0x00},  // 0046 (F){0x3c, 0x66, 0xc0, 0xc0, 0xce, 0x66, 0x3e, 0x00},  // 0047 (G){0xcc, 0xcc, 0xcc, 0xfc, 0xcc, 0xcc, 0xcc, 0x00},  // 0048 (H){0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00},  // 0049 (I){0x1e, 0x0c, 0x0c, 0x0c, 0xcc, 0xcc, 0x78, 0x00},  // 004a (J){0xe6, 0x66, 0x6c, 0x78, 0x6c, 0x66, 0xe6, 0x00},  // 004b (K){0xf0, 0x60, 0x60, 0x60, 0x62, 0x66, 0xfe, 0x00},  // 004c (L){0xc6, 0xee, 0xfe, 0xfe, 0xd6, 0xc6, 0xc6, 0x00},  // 004d (M){0xc6, 0xe6, 0xf6, 0xde, 0xce, 0xc6, 0xc6, 0x00},  // 004e (N){0x38, 0x6c, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00},  // 004f (O){0xfc, 0x66, 0x66, 0x7c, 0x60, 0x60, 0xf0, 0x00},  // 0050 (P){0x78, 0xcc, 0xcc, 0xcc, 0xdc, 0x78, 0x1c, 0x00},  // 0051 (Q){0xfc, 0x66, 0x66, 0x7c, 0x6c, 0x66, 0xe6, 0x00},  // 0052 (R){0x78, 0xcc, 0xe0, 0x70, 0x1c, 0xcc, 0x78, 0x00},  // 0053 (S){0xfc, 0xb4, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00},  // 0054 (T){0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0xfc, 0x00},  // 0055 (U){0xcc, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x30, 0x00},  // 0056 (V){0xc6, 0xc6, 0xc6, 0xd6, 0xfe, 0xee, 0xc6, 0x00},  // 0057 (W){0xc6, 0xc6, 0x6c, 0x38, 0x38, 0x6c, 0xc6, 0x00},  // 0058 (X){0xcc, 0xcc, 0xcc, 0x78, 0x30, 0x30, 0x78, 0x00},  // 0059 (Y){0xfe, 0xc6, 0x8c, 0x18, 0x32, 0x66, 0xfe, 0x00},  // 005a (Z){0x78, 0x60, 0x60, 0x60, 0x60, 0x60, 0x78, 0x00},  // 005b (bracketleft){0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x02, 0x00},  // 005c (backslash){0x78, 0x18, 0x18, 0x18, 0x18, 0x18, 0x78, 0x00},  // 005d (bracketright){0x10, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00},  // 005e (asciicircum){0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff},  // 005f (underscore){0x30, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00},  // 0060 (grave){0x00, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0x76, 0x00},  // 0061 (a){0xe0, 0x60, 0x60, 0x7c, 0x66, 0x66, 0xdc, 0x00},  // 0062 (b){0x00, 0x00, 0x78, 0xcc, 0xc0, 0xcc, 0x78, 0x00},  // 0063 (c){0x1c, 0x0c, 0x0c, 0x7c, 0xcc, 0xcc, 0x76, 0x00},  // 0064 (d){0x00, 0x00, 0x78, 0xcc, 0xfc, 0xc0, 0x78, 0x00},  // 0065 (e){0x38, 0x6c, 0x60, 0xf0, 0x60, 0x60, 0xf0, 0x00},  // 0066 (f){0x00, 0x00, 0x76, 0xcc, 0xcc, 0x7c, 0x0c, 0xf8},  // 0067 (g){0xe0, 0x60, 0x6c, 0x76, 0x66, 0x66, 0xe6, 0x00},  // 0068 (h){0x30, 0x00, 0x70, 0x30, 0x30, 0x30, 0x78, 0x00},  // 0069 (i){0x0c, 0x00, 0x0c, 0x0c, 0x0c, 0xcc, 0xcc, 0x78},  // 006a (j){0xe0, 0x60, 0x66, 0x6c, 0x78, 0x6c, 0xe6, 0x00},  // 006b (k){0x70, 0x30, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00},  // 006c (l){0x00, 0x00, 0xcc, 0xfe, 0xfe, 0xd6, 0xc6, 0x00},  // 006d (m){0x00, 0x00, 0xf8, 0xcc, 0xcc, 0xcc, 0xcc, 0x00},  // 006e (n){0x00, 0x00, 0x78, 0xcc, 0xcc, 0xcc, 0x78, 0x00},  // 006f (o){0x00, 0x00, 0xdc, 0x66, 0x66, 0x7c, 0x60, 0xf0},  // 0070 (p){0x00, 0x00, 0x76, 0xcc, 0xcc, 0x7c, 0x0c, 0x1e},  // 0071 (q){0x00, 0x00, 0xdc, 0x76, 0x66, 0x60, 0xf0, 0x00},  // 0072 (r){0x00, 0x00, 0x7c, 0xc0, 0x78, 0x0c, 0xf8, 0x00},  // 0073 (s){0x10, 0x30, 0x7c, 0x30, 0x30, 0x34, 0x18, 0x00},  // 0074 (t){0x00, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0x76, 0x00},  // 0075 (u){0x00, 0x00, 0xcc, 0xcc, 0xcc, 0x78, 0x30, 0x00},  // 0076 (v){0x00, 0x00, 0xc6, 0xd6, 0xfe, 0xfe, 0x6c, 0x00},  // 0077 (w){0x00, 0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00},  // 0078 (x){0x00, 0x00, 0xcc, 0xcc, 0xcc, 0x7c, 0x0c, 0xf8},  // 0079 (y){0x00, 0x00, 0xfc, 0x98, 0x30, 0x64, 0xfc, 0x00},  // 007a (z){0x1c, 0x30, 0x30, 0xe0, 0x30, 0x30, 0x1c, 0x00},  // 007b (braceleft){0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00},  // 007c (bar){0xe0, 0x30, 0x30, 0x1c, 0x30, 0x30, 0xe0, 0x00},  // 007d (braceright){0x76, 0xdc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},  // 007e (asciitilde){0x00, 0x10, 0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0x00},  // 007f (uni007F)// ---------------------------  160-255 ---------------------------{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},  // 00a0 (uni00A0){0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x18, 0x00},  // 00a1 (exclamdown){0x18, 0x18, 0x7e, 0xc0, 0xc0, 0x7e, 0x18, 0x18},  // 00a2 (cent){0x38, 0x6c, 0x64, 0xf0, 0x60, 0xe6, 0xfc, 0x00},  // 00a3 (sterling){0x00, 0xc6, 0x7c, 0xc6, 0xc6, 0x7c, 0xc6, 0x00},  // 00a4 (currency){0xcc, 0xcc, 0x78, 0xfc, 0x30, 0xfc, 0x30, 0x30},  // 00a5 (yen){0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00},  // 00a6 (brokenbar){0x3e, 0x63, 0x38, 0x6c, 0x6c, 0x38, 0xcc, 0x78},  // 00a7 (section){0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},  // 00a8 (dieresis){0x7e, 0x81, 0x9d, 0xa1, 0xa1, 0x9d, 0x81, 0x7e},  // 00a9 (copyright){0x3c, 0x6c, 0x6c, 0x3e, 0x00, 0x7e, 0x00, 0x00},  // 00aa (ordfeminine){0x00, 0x33, 0x66, 0xcc, 0x66, 0x33, 0x00, 0x00},  // 00ab (guillemotleft){0x00, 0x00, 0x00, 0xfc, 0x0c, 0x0c, 0x00, 0x00},  // 00ac (logicalnot){0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00},  // 00ad (uni00AD){0x7e, 0x81, 0xb9, 0xa5, 0xb9, 0xa5, 0x81, 0x7e},  // 00ae (registered){0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},  // 00af (macron){0x38, 0x6c, 0x6c, 0x38, 0x00, 0x00, 0x00, 0x00},  // 00b0 (degree){0x30, 0x30, 0xfc, 0x30, 0x30, 0x00, 0xfc, 0x00},  // 00b1 (plusminus){0x70, 0x18, 0x30, 0x60, 0x78, 0x00, 0x00, 0x00},  // 00b2 (uni00B2){0x70, 0x18, 0x30, 0x18, 0x70, 0x00, 0x00, 0x00},  // 00b3 (uni00B3){0x0c, 0x18, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00},  // 00b4 (acute){0x00, 0x66, 0x66, 0x66, 0x66, 0x7c, 0x60, 0xc0},  // 00b5 (mu){0x7f, 0xdb, 0xdb, 0x7b, 0x1b, 0x1b, 0x1b, 0x00},  // 00b6 (paragraph){0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00},  // 00b7 (periodcentered){0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x0c, 0x38},  // 00b8 (cedilla){0x30, 0x70, 0x30, 0x30, 0x78, 0x00, 0x00, 0x00},  // 00b9 (uni00B9){0x38, 0x6c, 0x6c, 0x38, 0x00, 0x7c, 0x00, 0x00},  // 00ba (ordmasculine){0x00, 0xcc, 0x66, 0x33, 0x66, 0xcc, 0x00, 0x00},  // 00bb (guillemotright){0xc3, 0xc6, 0xcc, 0xdb, 0x37, 0x6f, 0xcf, 0x03},  // 00bc (onequarter){0xc3, 0xc6, 0xcc, 0xde, 0x33, 0x66, 0xcc, 0x0f},  // 00bd (onehalf){0xe0, 0x33, 0x66, 0x3c, 0xfb, 0x37, 0x6f, 0xc3},  // 00be (threequarters){0x30, 0x00, 0x30, 0x60, 0xc0, 0xcc, 0x78, 0x00},  // 00bf (questiondown){0xc0, 0x38, 0x6c, 0xc6, 0xfe, 0xc6, 0xc6, 0x00},  // 00c0 (Agrave){0x06, 0x38, 0x6c, 0xc6, 0xfe, 0xc6, 0xc6, 0x00},  // 00c1 (Aacute){0x7c, 0xc6, 0x38, 0x6c, 0xc6, 0xfe, 0xc6, 0x00},  // 00c2 (Acircumflex){0x76, 0xdc, 0x38, 0x6c, 0xc6, 0xfe, 0xc6, 0x00},  // 00c3 (Atilde){0xc6, 0x38, 0x6c, 0xc6, 0xfe, 0xc6, 0xc6, 0x00},  // 00c4 (Adieresis){0x30, 0x30, 0x00, 0x78, 0xcc, 0xfc, 0xcc, 0x00},  // 00c5 (Aring){0x3e, 0x6c, 0xcc, 0xfe, 0xcc, 0xcc, 0xce, 0x00},  // 00c6 (AE){0x78, 0xcc, 0xc0, 0xcc, 0x78, 0x18, 0x0c, 0x78},  // 00c7 (Ccedilla){0xe0, 0x00, 0xfc, 0x60, 0x78, 0x60, 0xfc, 0x00},  // 00c8 (Egrave){0x1c, 0x00, 0xfc, 0x60, 0x78, 0x60, 0xfc, 0x00},  // 00c9 (Eacute){0x78, 0xcc, 0xfc, 0x60, 0x78, 0x60, 0xfc, 0x00},  // 00ca (Ecircumflex){0xcc, 0x00, 0xfc, 0x60, 0x78, 0x60, 0xfc, 0x00},  // 00cb (Edieresis){0xe0, 0x00, 0x78, 0x30, 0x30, 0x30, 0x78, 0x00},  // 00cc (Igrave){0x1c, 0x00, 0x78, 0x30, 0x30, 0x30, 0x78, 0x00},  // 00cd (Iacute){0x7e, 0xc3, 0x3c, 0x18, 0x18, 0x18, 0x3c, 0x00},  // 00ce (Icircumflex){0xcc, 0x00, 0x78, 0x30, 0x30, 0x30, 0x78, 0x00},  // 00cf (Idieresis){0xf8, 0x6c, 0x66, 0xf6, 0x66, 0x6c, 0xf8, 0x00},  // 00d0 (Eth){0xfc, 0x00, 0xcc, 0xec, 0xfc, 0xdc, 0xcc, 0x00},  // 00d1 (Ntilde){0xc0, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x00},  // 00d2 (Ograve){0x06, 0x38, 0x6c, 0xc6, 0xc6, 0x6c, 0x38, 0x00},  // 00d3 (Oacute){0x7c, 0xc6, 0x38, 0x6c, 0xc6, 0x6c, 0x38, 0x00},  // 00d4 (Ocircumflex){0x76, 0xdc, 0x38, 0x6c, 0xc6, 0x6c, 0x38, 0x00},  // 00d5 (Otilde){0xc3, 0x18, 0x3c, 0x66, 0x66, 0x3c, 0x18, 0x00},  // 00d6 (Odieresis){0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00, 0x00},  // 00d7 (multiply){0x3a, 0x6c, 0xce, 0xd6, 0xe6, 0x6c, 0xb8, 0x00},  // 00d8 (Oslash){0xe0, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00},  // 00d9 (Ugrave){0x1c, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00},  // 00da (Uacute){0x7c, 0xc6, 0x00, 0xc6, 0xc6, 0xc6, 0x7c, 0x00},  // 00db (Ucircumflex){0xcc, 0x00, 0xcc, 0xcc, 0xcc, 0xcc, 0x78, 0x00},  // 00dc (Udieresis){0x1c, 0x00, 0xcc, 0xcc, 0x78, 0x30, 0x78, 0x00},  // 00dd (Yacute){0xf0, 0x60, 0x7c, 0x66, 0x7c, 0x60, 0xf0, 0x00},  // 00de (Thorn){0x78, 0xcc, 0xcc, 0xd8, 0xcc, 0xc6, 0xcc, 0x00},  // 00df (germandbls){0xe0, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0x7e, 0x00},  // 00e0 (agrave){0x1c, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0x7e, 0x00},  // 00e1 (aacute){0x7e, 0xc3, 0x3c, 0x06, 0x3e, 0x66, 0x3f, 0x00},  // 00e2 (acircumflex){0x76, 0xdc, 0x78, 0x0c, 0x7c, 0xcc, 0x7e, 0x00},  // 00e3 (atilde){0xcc, 0x00, 0x78, 0x0c, 0x7c, 0xcc, 0x7e, 0x00},  // 00e4 (adieresis){0x30, 0x30, 0x78, 0x0c, 0x7c, 0xcc, 0x7e, 0x00},  // 00e5 (aring){0x00, 0x00, 0x7f, 0x0c, 0x7f, 0xcc, 0x7f, 0x00},  // 00e6 (ae){0x00, 0x00, 0x78, 0xc0, 0xc0, 0x78, 0x0c, 0x38},  // 00e7 (ccedilla){0xe0, 0x00, 0x78, 0xcc, 0xfc, 0xc0, 0x78, 0x00},  // 00e8 (egrave){0x1c, 0x00, 0x78, 0xcc, 0xfc, 0xc0, 0x78, 0x00},  // 00e9 (eacute){0x7e, 0xc3, 0x3c, 0x66, 0x7e, 0x60, 0x3c, 0x00},  // 00ea (ecircumflex){0xcc, 0x00, 0x78, 0xcc, 0xfc, 0xc0, 0x78, 0x00},  // 00eb (edieresis){0xe0, 0x00, 0x70, 0x30, 0x30, 0x30, 0x78, 0x00},  // 00ec (igrave){0x38, 0x00, 0x70, 0x30, 0x30, 0x30, 0x78, 0x00},  // 00ed (iacute){0x7c, 0xc6, 0x38, 0x18, 0x18, 0x18, 0x3c, 0x00},  // 00ee (icircumflex){0xcc, 0x00, 0x70, 0x30, 0x30, 0x30, 0x78, 0x00},  // 00ef (idieresis){0x30, 0x7e, 0x0c, 0x7c, 0xcc, 0xcc, 0x78, 0x00},  // 00f0 (eth){0x00, 0xf8, 0x00, 0xf8, 0xcc, 0xcc, 0xcc, 0x00},  // 00f1 (ntilde){0x00, 0xe0, 0x00, 0x78, 0xcc, 0xcc, 0x78, 0x00},  // 00f2 (ograve){0x00, 0x1c, 0x00, 0x78, 0xcc, 0xcc, 0x78, 0x00},  // 00f3 (oacute){0x78, 0xcc, 0x00, 0x78, 0xcc, 0xcc, 0x78, 0x00},  // 00f4 (ocircumflex){0x76, 0xdc, 0x00, 0x78, 0xcc, 0xcc, 0x78, 0x00},  // 00f5 (otilde){0x00, 0xcc, 0x00, 0x78, 0xcc, 0xcc, 0x78, 0x00},  // 00f6 (odieresis){0x30, 0x30, 0x00, 0xfc, 0x00, 0x30, 0x30, 0x00},  // 00f7 (divide){0x00, 0x02, 0x7c, 0xce, 0xd6, 0xe6, 0x7c, 0x80},  // 00f8 (oslash){0x00, 0xe0, 0x00, 0xcc, 0xcc, 0xcc, 0x7e, 0x00},  // 00f9 (ugrave){0x00, 0x1c, 0x00, 0xcc, 0xcc, 0xcc, 0x7e, 0x00},  // 00fa (uacute){0x78, 0xcc, 0x00, 0xcc, 0xcc, 0xcc, 0x7e, 0x00},  // 00fb (ucircumflex){0x00, 0xcc, 0x00, 0xcc, 0xcc, 0xcc, 0x7e, 0x00},  // 00fc (udieresis){0x00, 0x1c, 0x00, 0xcc, 0xcc, 0x7c, 0x0c, 0x78},  // 00fd (yacute){0xe0, 0x60, 0x7c, 0x66, 0x66, 0x7c, 0x60, 0xf0},  // 00fe (thorn){0x00, 0xcc, 0x00, 0xcc, 0xcc, 0x7c, 0x0c, 0xf8},  // 00ff (ydieresis)
};static inline const uint8_t* charBitmap(char c) {uint8_t idx = static_cast<uint8_t>(c);return font8x8_ib8x8u[idx];
}static inline void drawChar(void *data,int w, int h, PixFmt fmt,int x0, int y0, char c,int scale,uint8_t r = 255, uint8_t g = 255, uint8_t b = 255,uint8_t Y = 235, uint8_t U = 128, uint8_t V = 128);static inline void writeText(void *data,int imgW, int imgH, PixFmt imgFmt,int x, int y, const char *text,uint8_t r = 255, uint8_t g = 0, uint8_t b = 0,uint8_t Y = 76, uint8_t U = 84, uint8_t V = 255,int scale = 4, int space = 9);/* ---------- 实现 ---------- */
static inline void putPixel(void *data,int w, int h, PixFmt fmt,int x, int y,uint8_t r, uint8_t g, uint8_t b,uint8_t Y, uint8_t U, uint8_t V)
{if (fmt == PixFmt::RGB24) {uint8_t* p = static_cast<uint8_t*>(data) + (y * w + x) * 3;p[0] = r; p[1] = g; p[2] = b;} else if (fmt == PixFmt::YUV_NV12) {uint8_t* Y_plane = static_cast<uint8_t*>(data);uint8_t* U_plane = Y_plane + w * h;uint8_t* V_plane = U_plane + (w / 2) * (h / 2);uint8_t* UV_plane = Y_plane + w * h;Y_plane[y * w + x] = Y;int x2 = x / 2, y2 = y / 2;UV_plane[y2 * w + x] = U;UV_plane[y2 * w + x + 1] = V;}
}static inline void drawChar(void *data,int w, int h, PixFmt fmt,int x0, int y0, char c,int scale,uint8_t r, uint8_t g, uint8_t b,uint8_t Y, uint8_t U, uint8_t V)
{const uint8_t* bm = charBitmap(c);for (int row = 0; row < 8; ++row) {uint8_t bits = bm[row];for (int col = 0; col < 8; ++col) {if (!(bits & (1 << (7 - col)))) continue;for (int dy = 0; dy < scale; ++dy)for (int dx = 0; dx < scale; ++dx) {int px = x0 + col * scale + dx;int py = y0 + row * scale + dy;if (px < 0 || px >= w || py < 0 || py >= h) continue;putPixel(data, w, h, fmt, px, py, r, g, b, Y, U, V);}}}
}static inline void writeText(void *data,int imgW, int imgH, PixFmt imgFmt,int x, int y,const char *text,uint8_t r, uint8_t g, uint8_t b,uint8_t Y, uint8_t U, uint8_t V,int scale, int space)
{for (; *text; ++text) {drawChar(data, imgW, imgH, imgFmt, x, y, *text, scale, r, g, b, Y, U, V);x += space * scale;}
}static inline void writeTextRgb(void *data, int imgW, int imgH,int x, int y, int fontSize,const char *text,uint8_t r=255, uint8_t g=0, uint8_t b=0)
{int space = 8;for (; *text; ++text){drawChar(data, imgW, imgH, PixFmt::RGB24, x, y, *text, fontSize, r, g, b);x += space * fontSize;}
}static inline bool savePPM(const char *filename, void *rgb, int w, int h) {FILE *fp = fopen(filename, "wb");if (!fp) return false;fprintf(fp, "P6\n%d %d\n255\n", w, h);fwrite(rgb, 1, w * h * 3, fp);fclose(fp);return true;
}
}int main() {int imgW = 600;int imgH = 200;uint8_t rgb[imgW * imgH * 3];// set background colorstd::memset(rgb, 255, imgW * imgH * 3);// write text// OVERLAY::writeTextRgb(rgb, imgW, imgH, 10, 20, 1, "Good Job~ ", 255);OVERLAY::writeTextRgb(rgb, imgW, imgH, 10, 10, 2, "Good Job~ ", 255);OVERLAY::writeTextRgb(rgb, imgW, imgH, 10, 40, 3, "Good Job~ ", 25, 150, 66);OVERLAY::writeTextRgb(rgb, imgW, imgH, 10, 80, 4, "Good Job~ ", 2, 4, 6);OVERLAY::writeTextRgb(rgb, imgW, imgH, 10, 120, 4, "Data: 8 Aug. 2025", 0, 0, 255);OVERLAY::savePPM("save.ppm", rgb, imgW, imgH);return 0;
}#endif