Method load_embedded_image

compat/ico_loader.cpp:188–304

}

Error ImageLoaderICO::load_embedded_image(const IconEntry &p_icon_entry, Ref<Image> p_image, const Vector<uint8_t> &p_data, BitField<ImageFormatLoader::LoaderFlags> p_flags, float p_scale) {
	ERR_FAIL_COND_V_MSG(p_data.is_empty(), ERR_INVALID_DATA, "ImageLoaderICO: Empty image data.");

	// Check if it's PNG (modern ICO files often use PNG)
	if (p_data.size() >= 8) {
		bool is_png = true;
		for (int i = 0; i < 8; i++) {
			if (p_data[i] != PNG_SIGNATURE[i]) {
				is_png = false;
				break;
			}
		}

		if (is_png) {
			Error err = p_image->load_png_from_buffer(p_data);
			if (err == OK && !p_image->is_empty()) {
				if (p_scale != 1.0 && p_scale > 0.0) {
					int new_width = MAX(1, Math::round(p_image->get_width() * p_scale));
					int new_height = MAX(1, Math::round(p_image->get_height() * p_scale));
					p_image->resize(new_width, new_height, Image::INTERPOLATE_LANCZOS);
				}
				if (p_flags & FLAG_FORCE_LINEAR) {
					p_image->srgb_to_linear();
				}
				return OK;
			}
		}
	}

	// If it's not PNG, assume it's BMP (ICO spec only allows PNG or BMP)
	// Embedded BMP data excludes the BITMAPFILEHEADER, so we need to construct it
	if (p_data.size() < BITMAP_INFO_HEADER_MIN_SIZE) {
		ERR_FAIL_V_MSG(ERR_FILE_CORRUPT, "ImageLoaderICO: Embedded image data is too small to be a valid BMP.");
	}

	// Read BITMAPINFOHEADER to get header size and calculate color table
	// The embedded BMP data starts with BITMAPINFOHEADER (no BITMAPFILEHEADER)

	bmp_header_s bmp_header;

	Error err = parse_after_file_header(p_data, bmp_header);
	ERR_FAIL_COND_V_MSG(err != OK, err, "ImageLoaderICO: Failed to parse the BMP info header.");

	uint32_t info_header_size = bmp_header.bmp_info_header.bmp_header_size;
	ERR_FAIL_COND_V_MSG(info_header_size < BITMAP_INFO_HEADER_MIN_SIZE, ERR_FILE_CORRUPT,
			"ImageLoaderICO: Invalid BITMAPINFOHEADER size in embedded BMP data.");

	uint16_t bits_per_pixel = bmp_header.bmp_info_header.bmp_bit_count;
	uint32_t color_table_size = 0;
	if (bits_per_pixel <= 8) {
		// Support 256 colors max, 4 bytes per color
		color_table_size = (1 << bits_per_pixel) * 4;
	}

	bmp_header.bmp_file_header.bmp_signature = BITMAP_SIGNATURE;
	bmp_header.bmp_file_header.bmp_file_size = BITMAP_FILE_HEADER_SIZE + p_data.size();
	bmp_header.bmp_file_header.bmp_file_padding = 0;
	bmp_header.bmp_file_header.bmp_file_offset = BITMAP_FILE_HEADER_SIZE + info_header_size + color_table_size;