Function SavePNGImage

LibLemon/src/gfx/image.cpp:178–224

    }

    int SavePNGImage(FILE* f, surface_t* surface, bool writeTransparency) {
        png_structp png = nullptr;
        png_infop info = nullptr;

        (void)writeTransparency;
        
        png = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
        if(!png) return -10;

        info = png_create_info_struct(png);
        if(!info) return -11;

        int e = setjmp(png_jmpbuf(png));
        if(e){
            printf("[LibLemon] LoadPNGImage: setjmp error\n");
            return e;
        }

        png_init_io(png, f);
        png_set_compression_level(png, Z_BEST_COMPRESSION);

        png_uint_32 width = surface->width;
        png_uint_32 height = surface->height;

        png_set_IHDR(png, info, width, height, 8 /*32 bits per pixel*/, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);

        png_set_packing(png);

        surface_t _surface = {.width = static_cast<int>(width), .height = static_cast<int>(height), .depth = 32, .buffer = (uint8_t*)malloc(width * height * 4)};
        *surface = _surface;

        png_bytepp rowPointers = new png_bytep[height];

        for(png_uint_32 i = 0; i < height; i++){
            rowPointers[i] = surface->buffer + i * surface->width * 4;
        }

        png_set_rows(png, info, rowPointers);

        png_write_png(png, info, 0, nullptr);

        png_destroy_write_struct(&png, &info);

        delete[] rowPointers;

        return 0;
    }

    int LoadBitmapImage(FILE* f, surface_t* surface) {
        fseek(f, 0, SEEK_SET);