Seg Fault when calling SDL_BlitSurface a second time - c++

Question

I'm using SDL and SDL_Image to load images to be used as textures for opengl.
I'm trying to load a spritesheet with multiple images arranged in a horizontal row (in the same image)
void load_spritesheet(std::string key, const char *file_name, int width, int height, int nframes) {
GLuint *texture = new GLuint[nframes];
auto src = IMG_Load(file_name);
auto dstrect = new SDL_Rect{0, 0, width, height};
for(int i = 0; i < nframes; i++) {
auto dst = SDL_CreateRGBSurface(0, width, height, 1, src->format->Rmask, src->format->Gmask, src->format->Bmask, src->format->Amask);
auto rect = new SDL_Rect { i*width, 0, width, height };
SDL_BlitSurface(src, rect, dst, dstrect);
load_gltex(dst, &texture[i]);
SDL_FreeSurface(dst);
}
SPRITESHEET_CACHE[key] = texture;
SDL_FreeSurface(src);
}
I stepped through the code, and on the first iteration of the loop it works fine. On the second iteration I get a seg fault on the call to SDL_BlitSurface, none of the pointers passed in are NULL and none of the surfaces are locked or anything like that. I'm sure that my rectangles are within the bounds of each surface.
Here's some values from gdb at the point right before it segfaults:
print i
1
print *src
{flags = 0, format = 0x847100, w = 416, h = 32, pitch = 1664, pixels = 0x87c5f0, userdata = 0x0, locked = 0, lock_data = 0x0, clip_rect = {x = 0, y = 0, w = 416, h = 32}, map = 0x8537b0, refcount = 1}
print *dst
{flags = 0, format = 0x855ec0, w = 32, h = 32, pitch = 4, pixels = 0x84d1f0, userdata = 0x0, locked = 0, lock_data = 0x0, clip_rect = {x = 0, y = 0, w = 32, h = 32}, map = 0x6bdfc0, refcount = 1}
print *rect
{x = 32, y = 0, w = 32, h = 32}
print *dstrect
{x = 0, y = 0, w = 32, h = 32}
Is it unsafe to call SDL_BlitSurface twice on the same surface or something like that? Thanks.

Answer 1

Ah, the error was caused by improperly setting the depth on the call to SDL_CreateRGBSurface
I was passing in a 1 when I really should've been passing the correct value (32 in this case)
Once I corrected that the segfault went away.
https://wiki.libsdl.org/SDL_CreateRGBSurface#Remarks