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image display test

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bring your own test.png
This commit is contained in:
cat 2025-05-25 14:40:05 +10:00
parent 380f715903
commit 51d85c011b
2 changed files with 72 additions and 0 deletions
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11
dat.h
View file

@ -1,5 +1,16 @@
typedef struct Image Image;
struct Image {
int w;
int h;
int bpp;
unsigned char *data;
SDL_Texture *tex;
};
typedef struct State State; typedef struct State State;
struct State { struct State {
SDL_Window *win; SDL_Window *win;
SDL_Renderer *ren; SDL_Renderer *ren;
Image *test;
}; };

61
slutpet.c
View file

@ -9,6 +9,26 @@
void void
SDL_AppQuit(void *as, SDL_AppResult res) SDL_AppQuit(void *as, SDL_AppResult res)
{ {
State *st;
st = as;
if (st) {
if (st->test) {
if (st->test->tex) {
SDL_Log("free test texture...");
SDL_DestroyTexture(st->test->tex);
}
if (st->test->data) {
SDL_Log("free test img data...");
SDL_free(st->test->data);
}
SDL_Log("free test img...");
SDL_free(st->test);
}
SDL_Log("free state...");
SDL_free(st);
}
SDL_Log("bye!"); SDL_Log("bye!");
return; return;
} }
@ -29,6 +49,13 @@ SDL_AppEvent(void *as, SDL_Event *ev)
SDL_AppResult SDL_AppResult
SDL_AppIterate(void *as) SDL_AppIterate(void *as)
{ {
State *st = as;
SDL_SetRenderDrawColor(st->ren, 0, 0, 0, SDL_ALPHA_TRANSPARENT);
SDL_RenderClear(st->ren);
SDL_RenderTexture(st->ren, st->test->tex, NULL, NULL);
SDL_RenderPresent(st->ren);
return SDL_APP_CONTINUE; return SDL_APP_CONTINUE;
} }
@ -36,6 +63,7 @@ SDL_AppResult
SDL_AppInit(void **as, int argc, char **argv) SDL_AppInit(void **as, int argc, char **argv)
{ {
State *st; State *st;
SDL_Surface *sur;
SDL_Log("init sdl..."); SDL_Log("init sdl...");
if (!SDL_Init(SDL_INIT_VIDEO)) { if (!SDL_Init(SDL_INIT_VIDEO)) {
@ -62,6 +90,39 @@ SDL_AppInit(void **as, int argc, char **argv)
return SDL_APP_FAILURE; return SDL_APP_FAILURE;
} }
SDL_Log("create test image...");
st->test = SDL_calloc(1, sizeof(Image));
if (!st->test) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION,
"mem alloc fail: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
st->test->data = stbi_load("test.png", &st->test->w, &st->test->h,
&st->test->bpp, 4);
if (!st->test->data) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION,
"mem alloc fail: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
sur = SDL_CreateSurfaceFrom(st->test->w, st->test->h,
SDL_PIXELFORMAT_RGBA32, st->test->data,
st->test->w * 4);
if (!sur) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION,
"surface creation fail: %s", SDL_GetError());
return SDL_APP_FAILURE;
}
st->test->tex = SDL_CreateTextureFromSurface(st->ren, sur);
if (!st->test->tex) {
SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION,
"surface creation fail: %s", SDL_GetError());
SDL_DestroySurface(sur);
return SDL_APP_FAILURE;
}
SDL_Log("it work"); SDL_Log("it work");
return SDL_APP_CONTINUE; return SDL_APP_CONTINUE;
} }