QB64-PE/internal/c/parts/video/image/decode/png/src.c

#ifdef QB64_BACKSLASH_FILESYSTEM
#    include "src\\lodepng.cpp"
#else
#    include "src/lodepng.cpp"
#endif

uint8 *image_decode_png(uint8 *content, int32 bytes, int32 *result, int32 *x, int32 *y) {
    // Result:bit 1=Success,bit 2=32bit[BGRA]
    *result = 0;

    static unsigned char *png;
    static unsigned width, height;
    if (lodepng_decode32(&png, &width, &height, (unsigned char *)content, bytes))
        return NULL; // RGBA

    static uint8 *si;
    si = (uint8 *)png;
    static int32 w, h;
    w = width;
    h = height;
    static uint8 *di;

    di = (uint8 *)malloc(w * h * 4);
    // RGBA->BGRA
    static int32 c;
    c = w * h;
    while (c--) {
        di[c * 4 + 2] = si[c * 4];     // red
        di[c * 4 + 1] = si[c * 4 + 1]; // green
        di[c * 4] = si[c * 4 + 2];     // blue
        di[c * 4 + 3] = si[c * 4 + 3]; // alpha
    }

    // Cleanup
    free(si);

    *result = 1 + 2;
    *x = w;
    *y = h;
    return di;
}