Implement CanvasGroup and CanvasItem clipping

-Allows merging several 2D objects into a single draw operation
-Use current node to clip children nodes
-Further fixes to Vulkan barriers
-Changed font texture generation to white, fixes dark eges when blurred
-Other small misc fixes to backbuffer code.

1 files changed, 13 insertions, 2 deletions

diff --git a/scene/resources/dynamic_font.cpp b/scene/resources/dynamic_font.cpp
index ad9d888480..a0ce6e1194 100644
--- a/scene/resources/dynamic_font.cpp
+++ b/scene/resources/dynamic_font.cpp
@@ -458,8 +458,19 @@ DynamicFontAtSize::TexturePosition DynamicFontAtSize::_find_texture_pos_for_glyp
 			//zero texture
 			uint8_t *w = tex.imgdata.ptrw();
 			ERR_FAIL_COND_V(texsize * texsize * p_color_size > tex.imgdata.size(), ret);
-			for (int i = 0; i < texsize * texsize * p_color_size; i++) {
-				w[i] = 0;
+
+			if (p_color_size == 2) {
+				for (int i = 0; i < texsize * texsize * p_color_size; i += 2) {
+					w[i + 0] = 255;
+					w[i + 1] = 0;
+				}
+			} else {
+				for (int i = 0; i < texsize * texsize * p_color_size; i += 4) {
+					w[i + 0] = 255;
+					w[i + 1] = 255;
+					w[i + 2] = 255;
+					w[i + 3] = 0;
+				}
 			}
 		}
 		tex.offsets.resize(texsize);