[libgdx] Skeleton.getBounds() applies clipping, see #2515

EsotericSoftware · May 2, 2024 · b043e5c · b043e5c
1 parent a228adf
commit b043e5c
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Showing 2 changed files with 90 additions and 4 deletions.
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Skeleton.java
@@ -38,16 +38,16 @@
 import com.badlogic.gdx.utils.Null;
 
 import com.esotericsoftware.spine.Skin.SkinEntry;
-import com.esotericsoftware.spine.attachments.Attachment;
-import com.esotericsoftware.spine.attachments.MeshAttachment;
-import com.esotericsoftware.spine.attachments.PathAttachment;
-import com.esotericsoftware.spine.attachments.RegionAttachment;
+import com.esotericsoftware.spine.attachments.*;
+import com.esotericsoftware.spine.utils.SkeletonClipping;
 
 /** Stores the current pose for a skeleton.
  * <p>
  * See <a href="http://esotericsoftware.com/spine-runtime-architecture#Instance-objects">Instance objects</a> in the Spine
  * Runtimes Guide. */
 public class Skeleton {
+	static private final SkeletonClipping clipper = new SkeletonClipping();
+	static private final short[] quadTriangles = {0, 1, 2, 2, 3, 0};
 	final SkeletonData data;
 	final Array<Bone> bones;
 	final Array<Slot> slots;
@@ -699,19 +699,31 @@ public void getBounds (Vector2 offset, Vector2 size, FloatArray temp) {
 			if (!slot.bone.active) continue;
 			int verticesLength = 0;
 			float[] vertices = null;
+			short[] triangles = null;
 			Attachment attachment = slot.attachment;
 			if (attachment instanceof RegionAttachment) {
 				RegionAttachment region = (RegionAttachment)attachment;
 				verticesLength = 8;
 				vertices = temp.setSize(8);
 				region.computeWorldVertices(slot, vertices, 0, 2);
+				triangles = quadTriangles;
 			} else if (attachment instanceof MeshAttachment) {
 				MeshAttachment mesh = (MeshAttachment)attachment;
 				verticesLength = mesh.getWorldVerticesLength();
 				vertices = temp.setSize(verticesLength);
 				mesh.computeWorldVertices(slot, 0, verticesLength, vertices, 0, 2);
+				triangles = mesh.getTriangles();
+			} else if (attachment instanceof ClippingAttachment) {
+				ClippingAttachment clip = (ClippingAttachment)attachment;
+				clipper.clipStart(slot, clip);
+				continue;
 			}
 			if (vertices != null) {
+				if (clipper.isClipping()) {
+					clipper.clipTriangles(vertices, verticesLength, triangles, triangles.length);
+					vertices = clipper.getClippedVertices().items;
+					verticesLength = clipper.getClippedVertices().size;
+				}
 				for (int ii = 0; ii < verticesLength; ii += 2) {
 					float x = vertices[ii], y = vertices[ii + 1];
 					minX = Math.min(minX, x);
@@ -720,7 +732,9 @@ public void getBounds (Vector2 offset, Vector2 size, FloatArray temp) {
 					maxY = Math.max(maxY, y);
 				}
 			}
+			clipper.clipEnd(slot);
 		}
+		clipper.clipEnd();
 		offset.set(minX, minY);
 		size.set(maxX - minX, maxY - minY);
 	}

diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/utils/SkeletonClipping.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/utils/SkeletonClipping.java
@@ -82,6 +82,78 @@ public boolean isClipping () {
 		return clipAttachment != null;
 	}
 
+	public void clipTriangles (float[] vertices, int verticesLength, short[] triangles, int trianglesLength) {
+
+		FloatArray clipOutput = this.clipOutput, clippedVertices = this.clippedVertices;
+		ShortArray clippedTriangles = this.clippedTriangles;
+		Object[] polygons = clippingPolygons.items;
+		int polygonsCount = clippingPolygons.size;
+		int vertexSize = 2;
+
+		short index = 0;
+		clippedVertices.clear();
+		clippedTriangles.clear();
+		outer:
+		for (int i = 0; i < trianglesLength; i += 3) {
+			int vertexOffset = triangles[i] << 1;
+			float x1 = vertices[vertexOffset], y1 = vertices[vertexOffset + 1];
+
+			vertexOffset = triangles[i + 1] << 1;
+			float x2 = vertices[vertexOffset], y2 = vertices[vertexOffset + 1];
+
+			vertexOffset = triangles[i + 2] << 1;
+			float x3 = vertices[vertexOffset], y3 = vertices[vertexOffset + 1];
+
+			for (int p = 0; p < polygonsCount; p++) {
+				int s = clippedVertices.size;
+				if (clip(x1, y1, x2, y2, x3, y3, (FloatArray)polygons[p], clipOutput)) {
+					int clipOutputLength = clipOutput.size;
+					if (clipOutputLength == 0) continue;
+
+					int clipOutputCount = clipOutputLength >> 1;
+					float[] clipOutputItems = clipOutput.items;
+					float[] clippedVerticesItems = clippedVertices.setSize(s + clipOutputCount * vertexSize);
+					for (int ii = 0; ii < clipOutputLength; ii += 2) {
+						float x = clipOutputItems[ii], y = clipOutputItems[ii + 1];
+						clippedVerticesItems[s] = x;
+						clippedVerticesItems[s + 1] = y;
+						s += 2;
+					}
+
+					s = clippedTriangles.size;
+					short[] clippedTrianglesItems = clippedTriangles.setSize(s + 3 * (clipOutputCount - 2));
+					clipOutputCount--;
+					for (int ii = 1; ii < clipOutputCount; ii++) {
+						clippedTrianglesItems[s] = index;
+						clippedTrianglesItems[s + 1] = (short)(index + ii);
+						clippedTrianglesItems[s + 2] = (short)(index + ii + 1);
+						s += 3;
+					}
+					index += clipOutputCount + 1;
+
+				} else {
+					float[] clippedVerticesItems = clippedVertices.setSize(s + 3 * vertexSize);
+					clippedVerticesItems[s] = x1;
+					clippedVerticesItems[s + 1] = y1;
+
+					clippedVerticesItems[s + 2] = x2;
+					clippedVerticesItems[s + 3] = y2;
+
+					clippedVerticesItems[s + 4] = x3;
+					clippedVerticesItems[s + 5] = y3;
+
+					s = clippedTriangles.size;
+					short[] clippedTrianglesItems = clippedTriangles.setSize(s + 3);
+					clippedTrianglesItems[s] = index;
+					clippedTrianglesItems[s + 1] = (short)(index + 1);
+					clippedTrianglesItems[s + 2] = (short)(index + 2);
+					index += 3;
+					continue outer;
+				}
+			}
+		}
+	}
+
 	public void clipTriangles (float[] vertices, int verticesLength, short[] triangles, int trianglesLength, float[] uvs,
 		float light, float dark, boolean twoColor) {