Add TimeInterpolator support to RNA

 Bug: 14678626

Change-Id: I6554e7fcd42c49fac3618ca792083bb68e358f55

4 files changed, 61 insertions, 1 deletions

diff --git a/libs/hwui/Animator.h b/libs/hwui/Animator.h
index 86fc7c3..52a1807 100644
--- a/libs/hwui/Animator.h
+++ b/libs/hwui/Animator.h
@@ -45,6 +45,7 @@ public:
 
     ANDROID_API void setInterpolator(Interpolator* interpolator);
     ANDROID_API void setDuration(nsecs_t durationInMs);
+    ANDROID_API nsecs_t duration() { return mDuration; }
     ANDROID_API void setListener(AnimationListener* listener) {
         mListener = listener;
     }
diff --git a/libs/hwui/Interpolator.cpp b/libs/hwui/Interpolator.cpp
index 004ddf5..b56648e 100644
--- a/libs/hwui/Interpolator.cpp
+++ b/libs/hwui/Interpolator.cpp
@@ -13,9 +13,15 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+#define LOG_TAG "Interpolator"
+
 #include "Interpolator.h"
 
 #include <math.h>
+#include <cutils/log.h>
+
+#include "utils/MathUtils.h"
 
 namespace android {
 namespace uirenderer {
@@ -28,5 +34,34 @@ float AccelerateDecelerateInterpolator::interpolate(float input) {
     return (float)(cosf((input + 1) * M_PI) / 2.0f) + 0.5f;
 }
 
+LUTInterpolator::LUTInterpolator(float* values, size_t size) {
+    mValues = values;
+    mSize = size;
+}
+
+LUTInterpolator::~LUTInterpolator() {
+    delete mValues;
+    mValues = 0;
+}
+
+float LUTInterpolator::interpolate(float input) {
+    float lutpos = input * mSize;
+    if (lutpos >= (mSize - 1)) {
+        return mValues[mSize - 1];
+    }
+
+    float ipart, weight;
+    weight = modff(lutpos, &ipart);
+
+    int i1 = (int) ipart;
+    int i2 = MathUtils::min(i1 + 1, mSize - 1);
+
+    float v1 = mValues[i1];
+    float v2 = mValues[i2];
+
+    return MathUtils::lerp(v1, v2, weight);
+}
+
+
 } /* namespace uirenderer */
 } /* namespace android */
diff --git a/libs/hwui/Interpolator.h b/libs/hwui/Interpolator.h
index 2cfb60c..44fb37c 100644
--- a/libs/hwui/Interpolator.h
+++ b/libs/hwui/Interpolator.h
@@ -16,6 +16,10 @@
 #ifndef INTERPOLATOR_H
 #define INTERPOLATOR_H
 
+#include <stddef.h>
+
+#include <cutils/compiler.h>
+
 namespace android {
 namespace uirenderer {
 
@@ -31,7 +35,7 @@ protected:
     Interpolator() {}
 };
 
-class AccelerateDecelerateInterpolator : public Interpolator {
+class ANDROID_API AccelerateDecelerateInterpolator : public Interpolator {
 public:
     AccelerateDecelerateInterpolator() {}
     virtual ~AccelerateDecelerateInterpolator() {}
@@ -39,6 +43,18 @@ public:
     virtual float interpolate(float input);
 };
 
+class ANDROID_API LUTInterpolator : public Interpolator {
+public:
+    LUTInterpolator(float* values, size_t size);
+    ~LUTInterpolator();
+
+    virtual float interpolate(float input);
+
+private:
+    float* mValues;
+    size_t mSize;
+};
+
 } /* namespace uirenderer */
 } /* namespace android */
 
diff --git a/libs/hwui/utils/MathUtils.h b/libs/hwui/utils/MathUtils.h
index 8ba44dc..1a7082b 100644
--- a/libs/hwui/utils/MathUtils.h
+++ b/libs/hwui/utils/MathUtils.h
@@ -33,6 +33,14 @@ public:
     inline static bool isPositive(float value) {
         return value >= gNonZeroEpsilon;
     }
+
+    inline static int min(int a, int b) {
+        return a < b ? a : b;
+    }
+
+    inline static float lerp(float v1, float v2, float t) {
+        return v1 + ((v2 - v1) * t);
+    }
 }; // class MathUtils
 
 } /* namespace uirenderer */