Function SaveEXR

SampleFramework12/v1.00/TinyEXR.cpp:7371–7538

// @deprecated
#if 0
int SaveEXR(const float *in_rgba, int width, int height, const char *filename,
            const char **err) {
  if (in_rgba == NULL || filename == NULL) {
    if (err) {
      (*err) = "Invalid argument.";
    }
    return -1;
  }

  FILE *fp = fopen(filename, "wb");
  if (!fp) {
    if (err) {
      (*err) = "Cannot write a file.";
    }
    return -1;
  }

  // Header
  {
    const char header[] = {0x76, 0x2f, 0x31, 0x01};
    size_t n = fwrite(header, 1, 4, fp);
    assert(n == 4);
  }

  // Version, scanline.
  {
    const char marker[] = {2, 0, 0, 0};
    size_t n = fwrite(marker, 1, 4, fp);
    assert(n == 4);
  }

  int numScanlineBlocks = 16; // 16 for ZIP compression.

  // Write attributes.
  {
    unsigned char data[] = {
        'A', 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0,   0,   'B',
        0,   1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0,   'G', 0,
        1,   0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 'R', 0,   1,
        0,   0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0}; // last 0 =
                                                           // terminator.

    WriteAttribute(fp, "channels", "chlist", data, 18 * 4 + 1); // +1 = null
  }

  {
    int compressionType = 3; // ZIP compression
    WriteAttribute(fp, "compression", "compression",
                   reinterpret_cast<const unsigned char *>(&compressionType),
                   1);
  }

  {
    int data[4] = {0, 0, width - 1, height - 1};
    WriteAttribute(fp, "dataWindow", "box2i",
                   reinterpret_cast<const unsigned char *>(data),
                   sizeof(int) * 4);
    WriteAttribute(fp, "displayWindow", "box2i",