Image: Add a method for detecting signed values

1 files changed, 27 insertions, 0 deletions

diff --git a/core/io/image.cpp b/core/io/image.cpp
index 003646d095..f6065d984b 100644
--- a/core/io/image.cpp
+++ b/core/io/image.cpp
@@ -3824,6 +3824,33 @@ void Image::bump_map_to_normal_map(float bump_scale) {
 	data = result_image;
 }
 
+bool Image::detect_signed(bool p_include_mips) const {
+	ERR_FAIL_COND_V(is_compressed(), false);
+
+	if (format >= Image::FORMAT_RH && format <= Image::FORMAT_RGBAH) {
+		const uint16_t *img_data = reinterpret_cast<const uint16_t *>(data.ptr());
+		const uint64_t img_size = p_include_mips ? (data.size() / 2) : (width * height * get_format_pixel_size(format) / 2);
+
+		for (uint64_t i = 0; i < img_size; i++) {
+			if ((img_data[i] & 0x8000) != 0 && (img_data[i] & 0x7fff) != 0) {
+				return true;
+			}
+		}
+
+	} else if (format >= Image::FORMAT_RF && format <= Image::FORMAT_RGBAF) {
+		const uint32_t *img_data = reinterpret_cast<const uint32_t *>(data.ptr());
+		const uint64_t img_size = p_include_mips ? (data.size() / 4) : (width * height * get_format_pixel_size(format) / 4);
+
+		for (uint64_t i = 0; i < img_size; i++) {
+			if ((img_data[i] & 0x80000000) != 0 && (img_data[i] & 0x7fffffff) != 0) {
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
 void Image::srgb_to_linear() {
 	if (data.size() == 0) {
 		return;