imported crunchy code from my old project

brht0 · Oct 31, 2021 · 8cb673d · 8cb673d
1 parent da20f4b
commit 8cb673d
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diff --git a/.gitignore b/.gitignore
@@ -1,4 +1,5 @@
 out
 *.o
 *.d
+*.ttf
 
diff --git a/FontCache.cpp b/FontCache.cpp
@@ -0,0 +1,180 @@
+#include "FontCache.h"
+
+CFontNode* CFontMap::operator[](int index){
+    if(index < 0 || index >= map_length)
+        return nullptr;
+
+    CFontNode* node = start;
+
+    while(index > 0){
+        node = node->next;
+        index --;
+    }
+
+    return node;
+}
+
+CFontGlyph CFont::CreateGlyph(char c, CFontGlyphInfo* info){
+    CFontGlyph glyph;
+
+    SDL_Surface* surface = TTF_RenderGlyph_Blended(font, c, color);
+    SDL_Texture* texture = SDL_CreateTextureFromSurface(renderer, surface);
+
+    int w = surface->w;
+    int h = surface->h;
+
+    SDL_FreeSurface(surface);
+
+    glyph.texture = texture;
+
+    SDL_Rect rect = {0, 0, w, h};
+
+    info->rect = rect;
+
+    return glyph;
+}
+
+CFontGlyph* CFont::GetGlyph(char c, CFontGlyphInfo* info){
+    CFontNode* node = nodeMap[c - 0x20];
+
+    *info = node->glyphInfo;
+
+    return &node->glyph;
+}
+
+SDL_Rect CFont::GetTextSize(std::string text){
+    SDL_Rect rect = {0, 0, 0, 0};
+
+    for(char c : text){
+        CFontGlyphInfo info;
+        GetGlyph(c, &info);
+
+        rect.w += info.rect.w;
+        if(info.rect.h > rect.h)
+            rect.h = info.rect.h;
+    }
+    return rect;
+}
+
+CFont::CFont(SDL_Renderer* _renderer, const char* _fontfile, int _fontsize, SDL_Color _color)
+    : fontfile(_fontfile),
+    fontsize(_fontsize),
+    color(_color),
+    renderer(_renderer)
+{
+    font = TTF_OpenFont(fontfile, fontsize);
+
+    nodeMap.map_length = 0;
+    nodeMap.start = nullptr;
+
+    CFontNode* fontnode = new CFontNode;
+    CFontGlyphInfo info;
+    fontnode->glyph = CreateGlyph(0x20, &info);
+    fontnode->glyphInfo = info;
+
+    nodeMap.start = fontnode;
+    nodeMap.map_length ++;
+
+    for(int c = 0x21; c <= 0x7E; c++){
+        CFontNode* new_fontnode = new CFontNode;
+        new_fontnode->glyph = CreateGlyph(c, &info);
+        new_fontnode->glyphInfo = info;
+
+        fontnode->next = new_fontnode;
+        new_fontnode->next = nullptr;
+
+        fontnode = new_fontnode;
+
+        nodeMap.map_length ++;
+    }
+}
+
+CFont::~CFont(){
+    CFontNode* node = nodeMap.start;
+    do{
+        if(node){
+            if(node->glyph.texture)
+                node->glyph.texture;
+        }
+        node = node->next;
+    } while(node);
+
+    TTF_CloseFont(font);
+}
+
+void CFont::DrawText(int x, int y, const char* text){
+    int w = 0;
+
+    SDL_Rect dst = {x, y, 0, 0};
+
+    for(int c = 0; c < strlen(text); c++){
+        CFontGlyphInfo info;
+        CFontGlyph* glyph = GetGlyph(text[c], &info);
+
+        dst.w = info.rect.w;
+        dst.h = info.rect.h;
+
+        SDL_RenderCopy(renderer, glyph->texture, &info.rect, &dst);
+
+        dst.x += dst.w;
+    }
+}
+
+void CFont::DrawTextCentered(int center_x, int center_y, const char* text){
+    SDL_Rect text_size = GetTextSize(text);
+
+    DrawText( center_x - text_size.w / 2, center_y - text_size.h / 2, text);
+}
+
+void CFont::DrawWrappedText(int x, int y, int w, std::string text){
+    std::string line_buffer = "";
+
+    bool first_in_line = true;
+
+    while(text.length() > 0){
+        std::string word;
+        int space_index = text.find_first_of(' ');
+
+        if(space_index == -1)
+            word = text;
+        else
+            word = text.substr(0, space_index);
+
+        if(!first_in_line)
+            line_buffer += ' ';
+
+        line_buffer += word;
+
+        SDL_Rect line_size = GetTextSize(line_buffer);
+
+        if(line_size.w > w){
+            if(first_in_line){
+                text = text.substr(line_buffer.length() + 1);
+            }
+            else{
+                line_buffer = line_buffer.substr(0, line_buffer.length() - word.length());
+            }
+
+            DrawText(x, y, line_buffer.c_str());
+
+            y += line_size.h;
+
+            first_in_line = true;
+
+            line_buffer.clear();
+        }
+        else{
+            if(text.length() <= word.length())
+                text = "";
+            else
+                text = text.substr(word.length() + 1);
+
+            first_in_line = false;
+        }
+
+    }
+
+    if(!line_buffer.empty()){
+        DrawText(x, y, line_buffer.c_str());
+    }
+}
diff --git a/FontCache.h b/FontCache.h
@@ -0,0 +1,58 @@
+#ifndef __FONTCACHE_H__
+#define __FONTCACHE_H__
+
+#include "SDL2/SDL.h"
+#include "SDL2/SDL_ttf.h"
+
+#include <iostream>
+#include <cstring>
+#include <sstream>
+
+struct CFontGlyph{
+    SDL_Texture* texture;
+};
+
+struct CFontGlyphInfo{
+    SDL_Rect rect;
+};
+
+struct CFontNode{
+    CFontGlyph glyph;
+    CFontGlyphInfo glyphInfo;
+    CFontNode* next = nullptr;
+};
+
+struct CFontMap{
+    int map_length;
+    CFontNode* start = nullptr;
+
+    CFontNode* operator[](int index);
+};
+
+class CFont{
+private:
+    const char* fontfile;
+    int fontsize;
+    SDL_Color color;
+
+    SDL_Renderer* renderer;
+    TTF_Font* font;
+
+    CFontMap nodeMap;
+
+    CFontGlyph CreateGlyph(char c, CFontGlyphInfo* info);
+
+    CFontGlyph* GetGlyph(char c, CFontGlyphInfo* info);
+
+    SDL_Rect GetTextSize(std::string text);
+
+public:
+    CFont(SDL_Renderer* _renderer, const char* _fontfile, int _fontsize, SDL_Color _color);
+    ~CFont();
+
+    void DrawText(int x, int y, const char* text);
+    void DrawTextCentered(int center_x, int center_y, const char* text);
+    void DrawWrappedText(int x, int y, int w, std::string text);
+};
+
+#endif // __FONTCACHE_H__
diff --git a/Makefile b/Makefile
@@ -0,0 +1,2 @@
+main:
+	g++ -o out *.cpp -lSDL2 -lSDL2_ttf
diff --git a/demo_fontcache.cpp b/demo_fontcache.cpp
@@ -0,0 +1,57 @@
+#include "SDL2/SDL.h"
+#include "SDL2/SDL_ttf.h"
+
+#include <iostream>
+#include <cstring>
+#include <sstream>
+
+#include "FontCache.h"
+
+const int SCREEN_WIDTH = 800;
+const int SCREEN_HEIGHT = 600;
+
+int main(int, char*[]){
+
+    SDL_Init(SDL_INIT_VIDEO);
+    TTF_Init();
+
+    SDL_Window* window = SDL_CreateWindow("FontCache Demo", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC);
+
+    SDL_Color white = {255, 255, 255, 255};
+
+    {
+        CFont font(renderer, "verdana.ttf", 65, white);
+
+        bool quit = false;
+        while(!quit){
+            SDL_Event e;
+            while(SDL_PollEvent(&e)){
+                if(e.type == SDL_QUIT){
+                    quit = true;
+                }
+            }
+            SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
+            SDL_RenderClear(renderer);
+
+            std::stringstream ss;
+            ss << (int)SDL_GetTicks();
+
+            std::string text = u8"number: " + ss.str();
+
+            font.DrawText(30, 10, text.c_str());
+
+            std::string text2 = "This is some text that I just wrote, test test test test test test test test test";
+            font.DrawWrappedText(0, 70, 800, text2);
+
+            SDL_RenderPresent(renderer);
+        }
+    }
+
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(window);
+
+    TTF_Quit();
+    SDL_Quit();
+    return 0;
+}
-Original file line number
+Diff line change
@@ -1,4 +1,5 @@
     out
     *.o
     *.d
+    *.ttf