SDL_Image not displaying an image

Question

After fixing various other SDL errors, (both with SDL itself and SDL_Image) I have written this error-free code:

#include <SDL.h>
#include <SDL_image.h>
#include <iostream>
#include <string>

using namespace std;

#define null 0

SDL_Window *window = nullptr;
SDL_Renderer *renderer = nullptr;

SDL_Texture* LoadImage(string file)
{
    SDL_Texture *texture = nullptr;

    texture = IMG_LoadTexture(renderer, file.c_str());
    if (texture == nullptr)
        cout << "Failed to load image: " + file + IMG_GetError();
    return texture;
}

void ApplySurface(int x, int y, SDL_Texture *textureArgument, SDL_Renderer *rendererArgument)
{
    SDL_Rect pos;
    pos.x = x;
    pos.y = y;
    SDL_QueryTexture(textureArgument, null, null, &pos.w, &pos.h);
    SDL_RenderCopy(rendererArgument, textureArgument, null, &pos);
}

int main(int argc, char* argv[])
{
    if (SDL_Init(SDL_INIT_EVERYTHING))
        return 1;

    window = SDL_CreateWindow("ShitHappens", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);

    SDL_Texture *image = nullptr;
    image = LoadImage("image.png");

    SDL_RenderClear(renderer);

    int iW, iH;
    SDL_QueryTexture(image, NULL, NULL, &iW, &iH);
    int x = 640 / 2 - iW / 2, y = 480 / 2 - iH / 2;

    ApplySurface(x, y, image, renderer);
    SDL_RenderPresent(renderer);

    SDL_Delay(2000);
    SDL_DestroyTexture(image);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);

    return 0;
}

Which still does not display the image in question. I have tried replacing the functions with the SDL_LoadBMP() image and it succeeded, it even works if I load a BMP image through the current code, yet not a PNG image.

It has to be an issue with your image based on what you are saying ie that a BMP loads. Have you tried a different PNG? I would suggest putting in a nullptr check on image just after image = LoadImage("image.png"); to check if it is loaded or not. — TPS
– TPS, Commented Sep 25, 2013 at 11:16
Another thing, I'm not that familiar with Windows development as I work on OSX but would the image not be required to be in the same location as the compiled .exe file? If the location you mentioned is where the .exe is then just ignore this :-) — TPS
– TPS, Commented Sep 25, 2013 at 11:18
I'm guessing it could be related to your SLD_Image version. Try this std::cout << "SDL_Image version : " << SDL_IMAGE_MAJOR_VERSION << "." << SDL_IMAGE_MINOR_VERSION << "." << SDL_IMAGE_PATCHLEVEL << std::endl; It should print 2.0.0 — olevegard
– olevegard, Commented Sep 25, 2013 at 15:54

Swift Dev Journal · Accepted Answer · 2013-09-25 19:11:41Z

4

If BMP files load and PNG files don't load on Windows, you have a DLL location problem. To load PNGs properly on Windows, SDL_image requires that the libpng and zlib DLLs reside in the same directory as the executable. The Windows version of SDL_image uses libpng and zlib to load PNG files so you have to place those DLLs in the right directory. Just having the SDL_image DLL in the same directory as the executable isn't enough.

edited Sep 25, 2013 at 19:11

answered Sep 25, 2013 at 18:18

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Vallisneria · Accepted Answer · 2021-01-22 13:18:06Z

0

I had the same error and used the advice @MarkSzymczyk gave above. I simply hadn't added all the dll needed to the project folder. So I added all these:

SDL2_image.dll
libjpeg-9.dll
libpng16-16.dll
libtiff-5.dll
libwebp-7.dll

Then my image loaded. I think that I needed only the SDL2_image and libpng16-16 dlls but I added all of them for future use.

answered Jan 22, 2021 at 13:18

Vallisneria

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