Add interpolation parameter to resize_to_po2()

Image::resize_to_po2() now takes an optional p_interpolation parameter
that it passes directly to resize() with default value INTERPOLATE_BILINEAR.

core/io/image.cpp

@@ -993,7 +993,7 @@ bool Image::is_size_po2() const {
 	return uint32_t(width) == next_power_of_2(width) && uint32_t(height) == next_power_of_2(height);
 }
 
-void Image::resize_to_po2(bool p_square) {
+void Image::resize_to_po2(bool p_square, Interpolation p_interpolation) {
 	ERR_FAIL_COND_MSG(!_can_modify(format), "Cannot resize in compressed or custom image formats.");
 
 	int w = next_power_of_2(width);
@@ -1008,7 +1008,7 @@ void Image::resize_to_po2(bool p_square) {
 		}
 	}
 
-	resize(w, h);
+	resize(w, h, p_interpolation);
 }
 
 void Image::resize(int p_width, int p_height, Interpolation p_interpolation) {
@@ -3077,7 +3077,7 @@ void Image::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("get_mipmap_offset", "mipmap"), &Image::get_mipmap_offset);
 
-	ClassDB::bind_method(D_METHOD("resize_to_po2", "square"), &Image::resize_to_po2, DEFVAL(false));
+	ClassDB::bind_method(D_METHOD("resize_to_po2", "square", "interpolation"), &Image::resize_to_po2, DEFVAL(false), DEFVAL(INTERPOLATE_BILINEAR));
 	ClassDB::bind_method(D_METHOD("resize", "width", "height", "interpolation"), &Image::resize, DEFVAL(INTERPOLATE_BILINEAR));
 	ClassDB::bind_method(D_METHOD("shrink_x2"), &Image::shrink_x2);
 

core/io/image.h

@@ -244,7 +244,7 @@ public:
 	/**
 	 * Resize the image, using the preferred interpolation method.
 	 */
-	void resize_to_po2(bool p_square = false);
+	void resize_to_po2(bool p_square = false, Interpolation p_interpolation = INTERPOLATE_BILINEAR);
 	void resize(int p_width, int p_height, Interpolation p_interpolation = INTERPOLATE_BILINEAR);
 	void shrink_x2();
 	bool is_size_po2() const;

doc/classes/Image.xml

@@ -422,7 +422,7 @@
 			<argument index="2" name="interpolation" type="int" enum="Image.Interpolation" default="1">
 			</argument>
 			<description>
-				Resizes the image to the given [code]width[/code] and [code]height[/code]. New pixels are calculated using [code]interpolation[/code]. See [code]interpolation[/code] constants.
+				Resizes the image to the given [code]width[/code] and [code]height[/code]. New pixels are calculated using the [code]interpolation[/code] mode defined via [enum Interpolation] constants.
 			</description>
 		</method>
 		<method name="resize_to_po2">
@@ -430,8 +430,10 @@
 			</return>
 			<argument index="0" name="square" type="bool" default="false">
 			</argument>
+			<argument index="1" name="interpolation" type="int" enum="Image.Interpolation" default="1">
+			</argument>
 			<description>
-				Resizes the image to the nearest power of 2 for the width and height. If [code]square[/code] is [code]true[/code] then set width and height to be the same.
+				Resizes the image to the nearest power of 2 for the width and height. If [code]square[/code] is [code]true[/code] then set width and height to be the same. New pixels are calculated using the [code]interpolation[/code] mode defined via [enum Interpolation] constants.
 			</description>
 		</method>
 		<method name="rgbe_to_srgb">