Added ttf rendering support

Grzegorz Jabłoński
1 parent 6d66dde7
Showing 5 changed files with 47 additions and 11 deletions
DejaVuSans.ttf
makefile
primlib.c
primlib.h
testlib.c
 all: testlib
 testlib: testlib.o primlib.o
-	gcc -g $^ -o $@  -lSDL2_gfx `sdl2-config --libs`
+	gcc -g $^ -o $@  -lSDL2_gfx -lSDL2_ttf `sdl2-config --libs`
 .c.o: 
 	gcc -g -Wall -pedantic `sdl2-config --cflags` -c  $<
@@ -34,12 +34,13 @@ void gfx_line(int x1, int y1, int x2, int y2, enum color c) {
            255);
 }
-void gfx_filledTriangle(int x1, int y1, int x2, int y2, int x3, int y3, enum color c) {
+void gfx_filledTriangle(int x1, int y1, int x2, int y2, int x3, int y3,
+                        enum color c) {
   assert(c < COLOR_MAX);
   Sint16 xtab[] = {x1, x2, x3};
   Sint16 ytab[] = {y1, y2, y3};
-  filledPolygonRGBA(renderer, xtab, ytab, 3, colors[c].r, colors[c].g, colors[c].b,
-                255);
+  filledPolygonRGBA(renderer, xtab, ytab, 3, colors[c].r, colors[c].g,
+                    colors[c].b, 255);
 }
 void gfx_rect(int x1, int y1, int x2, int y2, enum color c) {
@@ -78,6 +79,28 @@ void gfx_textout(int x, int y, const char *s, enum color c) {
   stringRGBA(renderer, x, y, s, colors[c].r, colors[c].g, colors[c].b, 255);
 }
+void gfx_ttfout(int x, int y, int size, const char *font_path, const char* s, enum color c) {
+  assert(c < COLOR_MAX);
+  TTF_Font *font = TTF_OpenFont(font_path, size);
+  if (!font)
+    fprintf(stderr, "Error opening font: %s\n", TTF_GetError());
+
+  SDL_Color color = {colors[c].r, colors[c].g, colors[c].b};
+  SDL_Surface *surface = TTF_RenderText_Solid(font, s, color);
+  SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
+
+  int texW = 0;
+  int texH = 0;
+  SDL_QueryTexture(texture, NULL, NULL, &texW, &texH);
+  SDL_Rect dstrect = {x, y, texW, texH};
+
+  SDL_RenderCopy(renderer, texture, NULL, &dstrect);
+
+  SDL_DestroyTexture(texture);
+  SDL_FreeSurface(surface);
+  TTF_CloseFont(font);
+}
+
 int gfx_pollkey() {
   SDL_Event event;
   while (SDL_PollEvent(&event)) {
@@ -108,7 +131,7 @@ int gfx_isKeyDown(int key) {
   int numkeys;
   SDL_PumpEvents();
   SDL_Event event;
-  while(SDL_PollEvent(&event)) {
+  while (SDL_PollEvent(&event)) {
     switch (event.type) {
     case SDL_QUIT:
       exit(3);
@@ -121,6 +144,8 @@ int gfx_isKeyDown(int key) {
 }
 static void gfx_close() {
+  TTF_Quit();
+
   SDL_DestroyRenderer(renderer);
   SDL_DestroyWindow(window);
   SDL_Quit();
@@ -133,13 +158,20 @@ int gfx_init() {
     fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
     return 1;
   }
+
+  if (TTF_Init() < 0) {
+    fprintf(stderr, "Couldn't initialize TTF library: %s\n", TTF_GetError());
+    return 1;
+  }
+
   atexit(gfx_close);
-  window = SDL_CreateWindow("SDL", SDL_WINDOWPOS_UNDEFINED,
-                            SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH,
-                            SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+  window =
+      SDL_CreateWindow("SDL", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+                       SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
   if (window == NULL) {
-    fprintf(stderr, "Window could not be created! SDL Error: %s\n", SDL_GetError());
+    fprintf(stderr, "Window could not be created! SDL Error: %s\n",
+            SDL_GetError());
     return 2;
   } else {
     // Create renderer for window
@@ -150,7 +182,8 @@ int gfx_init() {
     }
     if (renderer == NULL) {
-      fprintf(stderr,"Renderer could not be created! SDL Error: %s\n", SDL_GetError());
+      fprintf(stderr, "Renderer could not be created! SDL Error: %s\n",
+              SDL_GetError());
       return 3;
     }
   }
@@ -3,6 +3,8 @@
 #include <SDL2/SDL.h>
 #include <SDL2/SDL2_gfxPrimitives.h>
+#include <SDL2/SDL_ttf.h>
+
 int gfx_init();
 enum color { BLACK, RED, GREEN, BLUE, CYAN, MAGENTA, YELLOW, WHITE, COLOR_MAX };
 void gfx_pixel(int x, int y, enum color c);
@@ -13,6 +15,7 @@ void gfx_filledRect(int x1, int y1, int x2, int y2, enum color c);
 void gfx_filledCircle(int x, int y, int r, enum color c);
 void gfx_rect(int x1, int y1, int x2, int y2, enum color c);
 void gfx_textout(int x, int y, const char *s, enum color c);
+void gfx_ttfout(int x, int y, int size, const char *font_path, const char* s, enum color c);
 int gfx_screenWidth();
 int gfx_screenHeight();
 void gfx_updateScreen();
@@ -8,7 +8,7 @@ int main(int argc, char *argv[]) {
   for (int i = -99; i < 100; ++i) {
     gfx_filledRect(0, 0, gfx_screenWidth() - 1, gfx_screenHeight() - 1, BLACK);
     gfx_filledCircle(gfx_screenWidth() / 2 + i, gfx_screenHeight() / 2, 100, YELLOW);
-    gfx_textout(gfx_screenWidth() / 2 - i, gfx_screenHeight() / 2, "This is a text", RED);
+    gfx_ttfout(gfx_screenWidth() / 2 - i, gfx_screenHeight() / 2, 40, "DejaVuSans.ttf", "This is a text", RED);
     gfx_updateScreen();
     SDL_Delay(10);
   }