Image: Improve error messages for invalid creation size

(cherry picked from commit b5488def4750665b8ca68b6cbdfdd824895fd38f)

core/image.cpp

@@ -1582,9 +1582,10 @@ PoolVector<uint8_t> Image::get_data() const {
 }
 
 void Image::create(int p_width, int p_height, bool p_use_mipmaps, Format p_format) {
-
-	ERR_FAIL_INDEX(p_width - 1, MAX_WIDTH);
-	ERR_FAIL_INDEX(p_height - 1, MAX_HEIGHT);
+	ERR_FAIL_COND_MSG(p_width <= 0, "Image width must be greater than 0.");
+	ERR_FAIL_COND_MSG(p_height <= 0, "Image height must be greater than 0.");
+	ERR_FAIL_COND_MSG(p_width > MAX_WIDTH, "Image width cannot be greater than " + itos(MAX_WIDTH) + ".");
+	ERR_FAIL_COND_MSG(p_height > MAX_HEIGHT, "Image height cannot be greater than " + itos(MAX_HEIGHT) + ".");
 
 	int mm = 0;
 	int size = _get_dst_image_size(p_width, p_height, p_format, mm, p_use_mipmaps ? -1 : 0);
@@ -1601,9 +1602,10 @@ void Image::create(int p_width, int p_height, bool p_use_mipmaps, Format p_forma
 }
 
 void Image::create(int p_width, int p_height, bool p_use_mipmaps, Format p_format, const PoolVector<uint8_t> &p_data) {
-
-	ERR_FAIL_INDEX(p_width - 1, MAX_WIDTH);
-	ERR_FAIL_INDEX(p_height - 1, MAX_HEIGHT);
+	ERR_FAIL_COND_MSG(p_width <= 0, "Image width must be greater than 0.");
+	ERR_FAIL_COND_MSG(p_height <= 0, "Image height must be greater than 0.");
+	ERR_FAIL_COND_MSG(p_width > MAX_WIDTH, "Image width cannot be greater than " + itos(MAX_WIDTH) + ".");
+	ERR_FAIL_COND_MSG(p_height > MAX_HEIGHT, "Image height cannot be greater than " + itos(MAX_HEIGHT) + ".");
 
 	int mm;
 	int size = _get_dst_image_size(p_width, p_height, p_format, mm, p_use_mipmaps ? -1 : 0);