Function save_hdr_buffer

utility/image_saver.cpp:475–592

}

Vector<uint8_t> save_hdr_buffer(const Ref<Image> &p_img, bool duplicate) {
	ERR_FAIL_COND_V_MSG(p_img.is_null(), Vector<uint8_t>(), "Can't save invalid image as HDR.");

	Ref<Image> img = duplicate ? (Ref<Image>)p_img->duplicate() : p_img;
	if (img->is_compressed() && img->decompress() != OK) {
		ERR_FAIL_V_MSG(Vector<uint8_t>(), "Failed to decompress image.");
	}

	img->clear_mipmaps();
	if (img->get_format() != Image::FORMAT_RGBE9995) {
		img->convert(Image::FORMAT_RGBE9995);
	}

	// Create a temporary file to write the HDR data
	Vector<uint8_t> buffer;

	// Write Radiance HDR header
	buffer.append_array(String("#?RADIANCE\n").to_utf8_buffer());
	buffer.append_array(String("FORMAT=32-bit_rle_rgbe\n").to_utf8_buffer());
	buffer.append_array(String("\n").to_utf8_buffer()); // Empty line to end header

	// Write resolution string (standard orientation: -Y height +X width)
	String resolution = vformat("-Y %d +X %d\n", img->get_height(), img->get_width());
	buffer.append_array(resolution.to_utf8_buffer());

	// Get image data
	const Vector<uint8_t> &data = img->get_data();
	const uint32_t *rgbe_data = reinterpret_cast<const uint32_t *>(data.ptr());
	int width = img->get_width();
	int height = img->get_height();
	// Write scanlines
	if (width < 8 || width >= 32768) {
		// Write flat data
		for (int y = 0; y < height; y++) {
			for (int x = 0; x < width; x++) {
				uint32_t rgbe = rgbe_data[y * width + x];
				buffer.push_back(get_r(rgbe));
				buffer.push_back(get_g(rgbe));
				buffer.push_back(get_b(rgbe));
				buffer.push_back(get_e(rgbe));
			}
		}
	} else {
		// Write RLE-encoded data
		for (int y = 0; y < height; y++) {
			// For each scanline, we need to separate the RGBE components
			Vector<uint8_t> scanline_r, scanline_g, scanline_b, scanline_e;
			scanline_r.resize(width);
			scanline_g.resize(width);
			scanline_b.resize(width);
			scanline_e.resize(width);

			// Extract RGBE components from RGBE9995 format and convert to Radiance HDR format
			for (int x = 0; x < width; x++) {
				uint32_t rgbe = rgbe_data[y * width + x];
				scanline_r.write[x] = get_r(rgbe);
				scanline_g.write[x] = get_g(rgbe);
				scanline_b.write[x] = get_b(rgbe);