无法正确显示中文！
有哪位大佬熟悉SDL2+FreeType2的吗？最近在学习用SDL2+FreeType2显示中英文本。
但是怎么改都无法正常显示，特来请教。用win10 + vs2019
#main.cpp
#define _CRT_SECURE_NO_WARNINGS
#include <windows.h>
#include <iostream>
#include <SDL.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include "iconv.h"
#pragma comment(lib, "SDL2maind.lib")
#pragma comment(lib, "SDL2-staticd.lib")
#pragma comment(lib, "SDL2.lib")
#pragma comment(lib, "freetyped.lib")
#pragma comment(lib, "iconv-static_Debug.lib")
#pragma comment(lib, "winmm.lib")
#pragma comment(lib, "imm32.lib")
#pragma comment(lib, "version.lib")
#pragma comment(lib, "setupapi.lib")
int L2U(const char* input, size_t charInPutLen);
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
void ft2_1(const char* text);
void DrawBitmap(FT_Bitmap bm, int x, int y, SDL_Surface* target);
SDL_Window* window = nullptr;
SDL_Renderer* renderer = nullptr;
SDL_Texture* texture = nullptr;
SDL_Surface* surface = nullptr;
uint32_t output = { 0 };
int fontsize = 48;//字体大小
int main(int argc, char* argv[]) {
//初始化SDL
SDL_Init(SDL_INIT_VIDEO);
//创建一个窗口
window = SDL_CreateWindow("FreeType2 with SDL2",
100,
100,
640, 480,
SDL_WINDOW_SHOWN);
//获得surface
surface = SDL_GetWindowSurface(window);
//创建渲染器
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);//设置背景颜色为蓝色
SDL_RenderClear(renderer); //清理屏幕
SDL_RenderPresent(renderer);//刷新屏幕
SDL_Event event = { 0 };
MSG msg = { 0 };
//我想正常显示下面的文本
const char* text = "Hello!中文!!";//定义文本内容
ft2_1(text);
while (GetMessage(&msg, NULL, 0, 0)) {
if (msg.message == WM_KEYDOWN && msg.wParam == VK_ESCAPE) {
// 按下 Esc 键，退出程序
PostQuitMessage(0);
break;
}
while (SDL_PollEvent(&event)) {/*监检鼠标事件*/
if (event.type == SDL_QUIT) {//检测到关闭事件，就是点击程序右上角的X
PostQuitMessage(0);
break;
}
break;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
SDL_DestroyWindow(window);
SDL_DestroyRenderer(renderer);
SDL_DestroyTexture(texture);
SDL_Quit();
return 0;
}
int L2U(const char* input, size_t charInPutLen) {
size_t output_size = 1024;
iconv_t cd = iconv_open("UCS-4-INTERNAL", "GBK");//设置为UNICODE
memset(&output, 0, output_size);
char* tmp = (char*)output;
iconv(cd, &input, &charInPutLen, &tmp, &output_size);
iconv_close(cd);
return (1024 - output_size) / 4;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
switch (message) {
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
void ft2_1(const char* text) {
FT_Library lib;
FT_Face face;
int x = 50, y = 100;//设置开始显示的坐标
FT_Init_FreeType(&lib);
FT_New_Face(lib, "GB2312.ttf", 0, &face); //加载外部字体GB2312.tff
FT_Select_Charmap(face, FT_ENCODING_UNICODE); //指定字符编码集UNICODE
FT_Set_Pixel_Sizes(face, 0, (FT_UInt)fontsize);//设置字体大小
size_t len = strlen((char*)text);
size_t count = L2U((char*)text, len);
for (size_t i = 0; i < count; ++i) {
FT_Load_Char(face, output, FT_LOAD_RENDER);
DrawBitmap(face->glyph->bitmap,
x + face->glyph->bitmap_left,
y - face->glyph->bitmap_top,
surface);
x += face->glyph->advance.x >> 6;//移动到下一个字符的位置
}
FT_Done_Face(face);
FT_Done_FreeType(lib);
}
//------主要是这个函数------------
void DrawBitmap(FT_Bitmap bitmap, int x, int y, SDL_Surface* surface) {
////创建SDL表面-1，用这个不显示任何字体，只有白方框没有文字
//SDL_Surface* glyphSurface = SDL_CreateRGBSurfaceFrom(
// bitmap.buffer,
// bitmap.width,
// bitmap.rows,
// 8,
// bitmap.pitch,
// 0, 0, 0, 0xFF);
//创建SDL表面-2，用这个显示多个重复字
SDL_Surface* glyphSurface = SDL_CreateRGBSurfaceWithFormatFrom(
bitmap.buffer,
bitmap.width,
bitmap.rows,
8,
bitmap.pitch * 4,
SDL_PIXELFORMAT_ARGB8888);
SDL_Rect dest = { x, y, 0, 0 };
SDL_BlitSurface(glyphSurface, nullptr, surface, &dest);
texture = SDL_CreateTextureFromSurface(renderer, glyphSurface);
SDL_RenderCopy(renderer, texture, nullptr, &dest);
SDL_RenderPresent(renderer);
SDL_FreeSurface(glyphSurface);
}
1-用SDL_CreateRGBSurfaceFrom函数-//创建SDL表面-1，用这个不显示任何字体，只有白方框没有文字
2-用SDL_CreateRGBSurfaceWithFormatFrom函数-//创建SDL表面-2，用这个显示多个重复字
大佬帮忙看看改哪里或怎么写才能正常显示文字。
试试问一下 AI chishingchan 发表于 2025-5-1 22:05
试试问一下 AI
问过AI，AI答非所问。没有给出关键问题的地方
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