Added support for frame scaling

addon/src/main/NativeCamera.gd

@@ -34,6 +34,16 @@ const PLUGIN_SINGLETON_NAME: String = "@pluginName@"
 ## Whether the emitted frames should be flipped vertically (top-bottom mirror).
 @export var mirror_vertical: bool = false
 
+## Target width (pixels) to scale the frame buffer to after rotation and mirroring.
+## Set to 0 (default) to disable scaling. Both scale_width and scale_height must be
+## non-zero for scaling to take effect.
+@export var scale_width: int = FeedRequest.DEFAULT_SCALE_WIDTH
+
+## Target height (pixels) to scale the frame buffer to after rotation and mirroring.
+## Set to 0 (default) to disable scaling. Both scale_width and scale_height must be
+## non-zero for scaling to take effect.
+@export var scale_height: int = FeedRequest.DEFAULT_SCALE_HEIGHT
+
 var _plugin_singleton: Object
 
 
@@ -104,6 +114,8 @@ func create_feed_request() -> FeedRequest:
 		. set_grayscale(is_grayscale)
 		. set_mirror_horizontal(mirror_horizontal)
 		. set_mirror_vertical(mirror_vertical)
+		. set_scale_width(scale_width)
+		. set_scale_height(scale_height)
 	)
 
 

addon/src/main/model/FeedRequest.gd

@@ -12,11 +12,17 @@ const DATA_ROTATION_PROPERTY := &"rotation"
 const DATA_IS_GRAYSCALE_PROPERTY := &"is_grayscale"
 const DATA_MIRROR_HORIZONTAL_PROPERTY := &"mirror_horizontal"
 const DATA_MIRROR_VERTICAL_PROPERTY := &"mirror_vertical"
+const DATA_SCALE_WIDTH_PROPERTY := &"scale_width"
+const DATA_SCALE_HEIGHT_PROPERTY := &"scale_height"
 
 const DEFAULT_WIDTH: int = 1280
 const DEFAULT_HEIGHT: int = 720
 const DEFAULT_FRAMES_TO_SKIP: int = 40
 const DEFAULT_ROTATION: int = 90
+## A value of 0 disables post-capture scaling on that axis.
+## Both scale_width and scale_height must be non-zero for scaling to take effect.
+const DEFAULT_SCALE_WIDTH: int = 0
+const DEFAULT_SCALE_HEIGHT: int = 0
 
 const DEFAULT_DATA: Dictionary = {
 	DATA_WIDTH_PROPERTY: DEFAULT_WIDTH,
@@ -25,7 +31,9 @@ const DEFAULT_DATA: Dictionary = {
 	DATA_ROTATION_PROPERTY: DEFAULT_ROTATION,
 	DATA_IS_GRAYSCALE_PROPERTY: false,
 	DATA_MIRROR_HORIZONTAL_PROPERTY: false,
-	DATA_MIRROR_VERTICAL_PROPERTY: false
+	DATA_MIRROR_VERTICAL_PROPERTY: false,
+	DATA_SCALE_WIDTH_PROPERTY: DEFAULT_SCALE_WIDTH,
+	DATA_SCALE_HEIGHT_PROPERTY: DEFAULT_SCALE_HEIGHT
 }
 
 var _data: Dictionary
@@ -75,5 +83,21 @@ func set_mirror_vertical(a_value: bool) -> FeedRequest:
 	return self
 
 
+## Sets the target width (in pixels) to which the frame buffer is scaled after
+## rotation and mirroring. Set to 0 (default) to disable scaling.
+## Both scale_width and scale_height must be non-zero for scaling to take effect.
+func set_scale_width(a_value: int) -> FeedRequest:
+	_data[DATA_SCALE_WIDTH_PROPERTY] = a_value
+	return self
+
+
+## Sets the target height (in pixels) to which the frame buffer is scaled after
+## rotation and mirroring. Set to 0 (default) to disable scaling.
+## Both scale_width and scale_height must be non-zero for scaling to take effect.
+func set_scale_height(a_value: int) -> FeedRequest:
+	_data[DATA_SCALE_HEIGHT_PROPERTY] = a_value
+	return self
+
+
 func get_raw_data() -> Dictionary:
 	return _data

android/src/main/java/org/godotengine/plugin/nativecamera/NativeCameraPlugin.java

@@ -67,6 +67,10 @@ public class NativeCameraPlugin extends GodotPlugin {
 	private volatile boolean isGrayscale;
 	private volatile boolean mirrorHorizontal;
 	private volatile boolean mirrorVertical;
+	/** Target width for post-capture scaling; 0 means disabled. */
+	private volatile int scaleWidth;
+	/** Target height for post-capture scaling; 0 means disabled. */
+	private volatile int scaleHeight;
 	private int frameCounter = 0;
 
 	private volatile boolean running = false;
@@ -168,6 +172,8 @@ public void start(Dictionary requestDict) {
 		isGrayscale = feedRequest.isGrayscale();
 		mirrorHorizontal = feedRequest.isMirrorHorizontal();
 		mirrorVertical = feedRequest.isMirrorVertical();
+		scaleWidth = feedRequest.getScaleWidth();
+		scaleHeight = feedRequest.getScaleHeight();
 		openCamera(feedRequest);
 	}
 
@@ -425,6 +431,18 @@ private void onImageAvailable(ImageReader reader) {
 				}
 			}
 
+			// Scaling is applied last — after rotation and mirroring — so that
+			// scale_width and scale_height always describe the final emitted dimensions.
+			if (scaleWidth > 0 && scaleHeight > 0 && (scaleWidth != width || scaleHeight != height)) {
+				if (isGrayscale) {
+					output = scaleGray(output, width, height, scaleWidth, scaleHeight);
+				} else {
+					output = scaleRGBA(output, width, height, scaleWidth, scaleHeight);
+				}
+				width = scaleWidth;
+				height = scaleHeight;
+			}
+
 			if (running) {
 				emitFrame(output, width, height, rotation, isGrayscale);
 			}
@@ -611,4 +629,41 @@ private static byte[] mirrorGray(byte[] src, int width, int height,
 		}
 		return dst;
 	}
+
+	/**
+	 * Scales an RGBA (4 bytes/pixel) frame buffer to {@code dstW × dstH} using
+	 * nearest-neighbour interpolation. Applied after rotation and mirroring.
+	 */
+	static byte[] scaleRGBA(byte[] src, int srcW, int srcH, int dstW, int dstH) {
+		byte[] dst = new byte[dstW * dstH * 4];
+		for (int dy = 0; dy < dstH; dy++) {
+			int sy = dy * srcH / dstH;
+			for (int dx = 0; dx < dstW; dx++) {
+				int sx = dx * srcW / dstW;
+				int srcIdx = (sy * srcW + sx) * 4;
+				int dstIdx = (dy * dstW + dx) * 4;
+				dst[dstIdx] = src[srcIdx];
+				dst[dstIdx + 1] = src[srcIdx + 1];
+				dst[dstIdx + 2] = src[srcIdx + 2];
+				dst[dstIdx + 3] = src[srcIdx + 3];
+			}
+		}
+		return dst;
+	}
+
+	/**
+	 * Scales a grayscale (1 byte/pixel) frame buffer to {@code dstW × dstH} using
+	 * nearest-neighbour interpolation. Applied after rotation and mirroring.
+	 */
+	static byte[] scaleGray(byte[] src, int srcW, int srcH, int dstW, int dstH) {
+		byte[] dst = new byte[dstW * dstH];
+		for (int dy = 0; dy < dstH; dy++) {
+			int sy = dy * srcH / dstH;
+			for (int dx = 0; dx < dstW; dx++) {
+				int sx = dx * srcW / dstW;
+				dst[dy * dstW + dx] = src[sy * srcW + sx];
+			}
+		}
+		return dst;
+	}
 }

android/src/main/java/org/godotengine/plugin/nativecamera/model/FeedRequest.java

@@ -19,6 +19,8 @@ public class FeedRequest {
 	private static final String DATA_IS_GRAYSCALE_PROPERTY = "is_grayscale";
 	private static final String DATA_MIRROR_HORIZONTAL_PROPERTY = "mirror_horizontal";
 	private static final String DATA_MIRROR_VERTICAL_PROPERTY = "mirror_vertical";
+	private static final String DATA_SCALE_WIDTH_PROPERTY = "scale_width";
+	private static final String DATA_SCALE_HEIGHT_PROPERTY = "scale_height";
 
 	private Dictionary data;
 
@@ -70,6 +72,26 @@ public boolean isMirrorVertical() {
 	}
 
 
+	/**
+	 * Returns the target width (pixels) to scale the post-processed frame to.
+	 * A value of 0 (the default) means no scaling on this axis.
+	 * Scaling is only applied when both scale_width and scale_height are non-zero.
+	 */
+	public int getScaleWidth() {
+		return data.containsKey(DATA_SCALE_WIDTH_PROPERTY) ? toInt(data.get(DATA_SCALE_WIDTH_PROPERTY)) : 0;
+	}
+
+
+	/**
+	 * Returns the target height (pixels) to scale the post-processed frame to.
+	 * A value of 0 (the default) means no scaling on this axis.
+	 * Scaling is only applied when both scale_width and scale_height are non-zero.
+	 */
+	public int getScaleHeight() {
+		return data.containsKey(DATA_SCALE_HEIGHT_PROPERTY) ? toInt(data.get(DATA_SCALE_HEIGHT_PROPERTY)) : 0;
+	}
+
+
 	public Dictionary getRawData() {
 		return data;
 	}

android/src/test/java/org/godotengine/plugin/nativecamera/FeedRequestTest.java

@@ -88,6 +88,7 @@ public void getFramesToSkip_missingKey_returnsDefaultOne() {
 
 	@Test
 	public void getFramesToSkip_minimalDict_returnsDefaultOne() {
+		// minimalDict has no frames_to_skip key → default 1
 		FeedRequest req = new FeedRequest(FeedRequestFixtures.minimalDict());
 		assertEquals(1, req.getFramesToSkip());
 	}
@@ -222,6 +223,101 @@ public void mirrorVerticalDict_onlyVerticalTrue() {
 		assertTrue(req.isMirrorVertical());
 	}
 
+	// ── scaleWidth ────────────────────────────────────────────────────────
+
+	@Test
+	public void getScaleWidth_returnsValueFromDict() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaledDict());
+		assertEquals(640, req.getScaleWidth());
+	}
+
+	@Test
+	public void getScaleWidth_missingKey_returnsDefaultZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.emptyDict());
+		assertEquals(0, req.getScaleWidth());
+	}
+
+	@Test
+	public void getScaleWidth_zeroInFullDict_returnsZero() {
+		// fullDict() stores scale_width = 0 (disabled)
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.fullDict());
+		assertEquals(0, req.getScaleWidth());
+	}
+
+	@Test
+	public void getScaleWidth_minimalDict_returnsDefaultZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.minimalDict());
+		assertEquals(0, req.getScaleWidth());
+	}
+
+	@Test
+	public void getScaleWidth_scaleWidthOnlyDict_returnsValue() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaleWidthOnlyDict());
+		assertEquals(640, req.getScaleWidth());
+	}
+
+	// ── scaleHeight ───────────────────────────────────────────────────────
+
+	@Test
+	public void getScaleHeight_returnsValueFromDict() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaledDict());
+		assertEquals(360, req.getScaleHeight());
+	}
+
+	@Test
+	public void getScaleHeight_missingKey_returnsDefaultZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.emptyDict());
+		assertEquals(0, req.getScaleHeight());
+	}
+
+	@Test
+	public void getScaleHeight_zeroInFullDict_returnsZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.fullDict());
+		assertEquals(0, req.getScaleHeight());
+	}
+
+	@Test
+	public void getScaleHeight_minimalDict_returnsDefaultZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.minimalDict());
+		assertEquals(0, req.getScaleHeight());
+	}
+
+	@Test
+	public void getScaleHeight_scaleHeightOnlyDict_returnsValue() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaleHeightOnlyDict());
+		assertEquals(360, req.getScaleHeight());
+	}
+
+	// ── scale combined ────────────────────────────────────────────────────
+
+	@Test
+	public void scaledDict_bothDimensionsPopulated() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaledDict());
+		assertEquals(640, req.getScaleWidth());
+		assertEquals(360, req.getScaleHeight());
+	}
+
+	@Test
+	public void scaleIdentityDict_dimensionsEqualCaptureSize() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaleIdentityDict());
+		assertEquals(1280, req.getScaleWidth());
+		assertEquals(720, req.getScaleHeight());
+	}
+
+	@Test
+	public void scaleWidthOnlyDict_heightRemainsZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaleWidthOnlyDict());
+		assertEquals(640, req.getScaleWidth());
+		assertEquals(0, req.getScaleHeight());
+	}
+
+	@Test
+	public void scaleHeightOnlyDict_widthRemainsZero() {
+		FeedRequest req = new FeedRequest(FeedRequestFixtures.scaleHeightOnlyDict());
+		assertEquals(0, req.getScaleWidth());
+		assertEquals(360, req.getScaleHeight());
+	}
+
 	// ── type coercion (Long -> int) ───────────────────────────────────────
 
 	@Test
@@ -232,11 +328,15 @@ public void intFields_neverThrowClassCastException_forLongValues() {
 		d.put("height", Long.MAX_VALUE);
 		d.put("frames_to_skip", Long.MAX_VALUE);
 		d.put("rotation", Long.MAX_VALUE);
+		d.put("scale_width", Long.MAX_VALUE);
+		d.put("scale_height", Long.MAX_VALUE);
 		FeedRequest req = new FeedRequest(d);
 		// Just calling the getters must not throw
 		req.getWidth();
 		req.getHeight();
 		req.getFramesToSkip();
 		req.getRotation();
+		req.getScaleWidth();
+		req.getScaleHeight();
 	}
 }