1 files changed, 83 insertions, 0 deletions
diff --git a/libs/hwui/SpotShadow.h b/libs/hwui/SpotShadow.h
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+++ b/libs/hwui/SpotShadow.h
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+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_HWUI_SPOT_SHADOW_H
+#define ANDROID_HWUI_SPOT_SHADOW_H
+
+#include "Debug.h"
+#include "Vector.h"
+#include "VertexBuffer.h"
+
+namespace android {
+namespace uirenderer {
+
+class SpotShadow {
+public:
+    static VertexBufferMode createSpotShadow(bool isCasterOpaque, const Vector3* poly,
+            int polyLength, const Vector3& lightCenter, float lightSize,
+            int lightVertexCount, VertexBuffer& retStrips);
+
+private:
+    static int calculateOccludedUmbra(const Vector2* umbra, int umbraLength,
+            const Vector3* poly, int polyLength, Vector2* occludedUmbra);
+    static void computeSpotShadow(bool isCasterOpaque, const Vector3* lightPoly,
+            int lightPolyLength, const Vector3& lightCenter, const Vector3* poly,
+            int polyLength, VertexBuffer& retstrips);
+
+    static void computeLightPolygon(int points, const Vector3& lightCenter,
+            float size, Vector3* ret);
+
+    static void smoothPolygon(int level, int rays, float* rayDist);
+    static float rayIntersectPoly(const Vector2* poly, int polyLength,
+            const Vector2& point, float dx, float dy);
+
+    static void xsort(Vector2* points, int pointsLength);
+    static int hull(Vector2* points, int pointsLength, Vector2* retPoly);
+    static bool ccw(double ax, double ay, double bx, double by, double cx, double cy);
+    static int intersection(const Vector2* poly1, int poly1length, Vector2* poly2, int poly2length);
+    static void sort(Vector2* poly, int polyLength, const Vector2& center);
+
+    static void swap(Vector2* points, int i, int j);
+    static void quicksortCirc(Vector2* points, int low, int high, const Vector2& center);
+    static void quicksortX(Vector2* points, int low, int high);
+
+    static bool testPointInsidePolygon(const Vector2 testPoint, const Vector2* poly, int len);
+    static void makeClockwise(Vector2* polygon, int len);
+    static bool isClockwise(const Vector2* polygon, int len);
+    static void reverse(Vector2* polygon, int len);
+    static inline bool lineIntersection(double x1, double y1, double x2, double y2,
+            double x3, double y3, double x4, double y4, Vector2& ret);
+
+    static void generateTriangleStrip(bool isCasterOpaque, const Vector2* penumbra,
+            int penumbraLength, const Vector2* umbra, int umbraLength,
+            const Vector3* poly, int polyLength, VertexBuffer& retstrips);
+
+#if DEBUG_SHADOW
+    // Verification utility function.
+    static bool testConvex(const Vector2* polygon, int polygonLength,
+            const char* name);
+    static void testIntersection(const Vector2* poly1, int poly1Length,
+        const Vector2* poly2, int poly2Length,
+        const Vector2* intersection, int intersectionLength);
+    static void updateBound(const Vector2 inVector, Vector2& lowerBound, Vector2& upperBound );
+#endif
+
+}; // SpotShadow
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_HWUI_SPOT_SHADOW_H