1 files changed, 57 insertions, 0 deletions

diff --git a/core/image.cpp b/core/image.cpp
index e0cf82d920..023a058667 100644
--- a/core/image.cpp
+++ b/core/image.cpp
@@ -1646,6 +1646,62 @@ void Image::blit_rect(const Ref<Image> &p_src, const Rect2 &p_src_rect, const Po
 	}
 }
 
+void Image::blit_rect_mask(const Ref<Image> &p_src, const Ref<Image> &p_mask, const Rect2 &p_src_rect, const Point2 &p_dest) {
+
+	ERR_FAIL_COND(p_src.is_null());
+	ERR_FAIL_COND(p_mask.is_null());
+	int dsize = data.size();
+	int srcdsize = p_src->data.size();
+	int maskdsize = p_mask->data.size();
+	ERR_FAIL_COND(dsize == 0);
+	ERR_FAIL_COND(srcdsize == 0);
+	ERR_FAIL_COND(maskdsize == 0);
+	ERR_FAIL_COND(p_src->width != p_mask->width);
+	ERR_FAIL_COND(p_src->height != p_mask->height);
+	ERR_FAIL_COND(format != p_src->format);
+
+	Rect2i clipped_src_rect = Rect2i(0, 0, p_src->width, p_src->height).clip(p_src_rect);
+	if (clipped_src_rect.size.x <= 0 || clipped_src_rect.size.y <= 0)
+		return;
+
+	Rect2i dest_rect = Rect2i(0, 0, width, height).clip(Rect2i(p_dest, clipped_src_rect.size));
+
+	PoolVector<uint8_t>::Write wp = data.write();
+	uint8_t *dst_data_ptr = wp.ptr();
+
+	PoolVector<uint8_t>::Read rp = p_src->data.read();
+	const uint8_t *src_data_ptr = rp.ptr();
+
+	int pixel_size = get_format_pixel_size(format);
+	
+	Ref<Image> msk = p_mask;
+	msk->lock();
+
+	for (int i = 0; i < dest_rect.size.y; i++) {
+
+		for (int j = 0; j < dest_rect.size.x; j++) {
+
+			int src_x = clipped_src_rect.position.x + j;
+			int src_y = clipped_src_rect.position.y + i;
+			
+			if (msk->get_pixel(src_x, src_y).a != 0) {
+
+				int dst_x = dest_rect.position.x + j;
+				int dst_y = dest_rect.position.y + i;
+
+				const uint8_t *src = &src_data_ptr[(src_y * p_src->width + src_x) * pixel_size];
+				uint8_t *dst = &dst_data_ptr[(dst_y * width + dst_x) * pixel_size];
+
+				for (int k = 0; k < pixel_size; k++) {
+					dst[k] = src[k];
+				}
+			}
+		}
+	}
+
+	msk->unlock();
+}
+
 void Image::blend_rect(const Ref<Image> &p_src, const Rect2 &p_src_rect, const Point2 &p_dest) {
 
 	ERR_FAIL_COND(p_src.is_null());
@@ -2199,6 +2255,7 @@ void Image::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("normalmap_to_xy"), &Image::normalmap_to_xy);
 
 	ClassDB::bind_method(D_METHOD("blit_rect", "src:Image", "src_rect", "dst"), &Image::blit_rect);
+	ClassDB::bind_method(D_METHOD("blit_rect_mask", "src:Image", "mask:Image", "src_rect", "dst"), &Image::blit_rect_mask);
 	ClassDB::bind_method(D_METHOD("blend_rect", "src:Image", "src_rect", "dst"), &Image::blend_rect);
 	ClassDB::bind_method(D_METHOD("blend_rect_mask", "src:Image", "mask:Image", "src_rect", "dst"), &Image::blend_rect_mask);
 	ClassDB::bind_method(D_METHOD("fill", "color"), &Image::fill);