添加加载图片示例

plter · Oct 17, 2020 · 4430c9c · 4430c9c
1 parent 9f7b1c5
commit 4430c9c
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diff --git a/L03LoadPhoto/CMakeLists.txt b/L03LoadPhoto/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.17)
+project(L03LoadPhoto C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_compile_definitions(THREAD_SAFE)
+
+include_directories(
+        /usr/local/include/SDL2
+)
+
+link_directories(
+        /usr/local/lib
+)
+
+link_libraries(
+        SDL2
+        SDL2_image
+)
+
+add_executable(L03LoadPhoto main.c)
diff --git a/L03LoadPhoto/cat.jpg b/L03LoadPhoto/cat.jpg
diff --git a/L03LoadPhoto/main.c b/L03LoadPhoto/main.c
@@ -0,0 +1,77 @@
+#include <SDL.h>
+#include <SDL_image.h>
+
+#define WIDTH 550
+#define HEIGHT 400
+#define CAT_PHOTO_FILE "cat.jpg"
+
+SDL_Texture *photo;
+
+void drawBackground(SDL_Renderer *renderer) {
+    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
+    SDL_Rect rect = {0, 0, WIDTH, HEIGHT};
+    SDL_RenderFillRect(renderer, &rect);
+}
+
+void drawScreen(struct SDL_Renderer *renderer) {
+    if (photo != NULL) {
+        SDL_Rect dr = {0, 0, 300, 300};
+        SDL_RenderCopy(renderer, photo, NULL, &dr);
+    }
+}
+
+void draw(SDL_Renderer *renderer) {
+    drawBackground(renderer);
+    drawScreen(renderer);
+}
+
+int main() {
+    SDL_Window *win;
+    SDL_Renderer *renderer;
+    if (SDL_Init(SDL_INIT_VIDEO)) {
+        SDL_Log("Unable to init SLD: %s", SDL_GetError());
+        return 1;
+    }
+    win = SDL_CreateWindow(
+            "Hello World",
+            SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+            WIDTH, HEIGHT,
+            SDL_WINDOW_OPENGL
+    );
+    if (win == NULL) {
+        SDL_Log("Unable to create window: %s", SDL_GetError());
+        return 1;
+    }
+
+    renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
+    if (renderer == NULL) {
+        SDL_Log("Can not create renderer: %s", SDL_GetError());
+        return 1;
+    }
+
+    photo = IMG_LoadTexture(renderer, CAT_PHOTO_FILE);
+    if (photo == NULL) {
+        SDL_Log("Can not load %s", CAT_PHOTO_FILE);
+    }
+
+    while (1) {
+        SDL_RenderClear(renderer);
+        draw(renderer);
+        SDL_RenderPresent(renderer);
+
+        SDL_Event event;
+        if (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT) {
+                break;
+            }
+        }
+    }
+
+    if (photo != NULL) {
+        SDL_DestroyTexture(photo);
+    }
+    SDL_DestroyRenderer(renderer);
+    SDL_DestroyWindow(win);
+    SDL_Quit();
+    return 0;
+}