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      1 #include "jni.h"
      2 #include "core_jni_helpers.h"
      3 
      4 #include "GraphicsJNI.h"
      5 #include "SkInterpolator.h"
      6 #include "SkTemplates.h"
      7 
      8 static jlong Interpolator_constructor(JNIEnv* env, jobject clazz, jint valueCount, jint frameCount)
      9 {
     10     return reinterpret_cast<jlong>(new SkInterpolator(valueCount, frameCount));
     11 }
     12 
     13 static void Interpolator_destructor(JNIEnv* env, jobject clazz, jlong interpHandle)
     14 {
     15     SkInterpolator* interp = reinterpret_cast<SkInterpolator*>(interpHandle);
     16     delete interp;
     17 }
     18 
     19 static void Interpolator_reset(JNIEnv* env, jobject clazz, jlong interpHandle, jint valueCount, jint frameCount)
     20 {
     21     SkInterpolator* interp = reinterpret_cast<SkInterpolator*>(interpHandle);
     22     interp->reset(valueCount, frameCount);
     23 }
     24 
     25 static void Interpolator_setKeyFrame(JNIEnv* env, jobject clazz, jlong interpHandle, jint index, jint msec, jfloatArray valueArray, jfloatArray blendArray)
     26 {
     27     SkInterpolator* interp = reinterpret_cast<SkInterpolator*>(interpHandle);
     28 
     29     AutoJavaFloatArray autoValues(env, valueArray);
     30     AutoJavaFloatArray autoBlend(env, blendArray, 4);
     31 #ifdef SK_SCALAR_IS_FLOAT
     32     SkScalar* scalars = autoValues.ptr();
     33     SkScalar* blend = autoBlend.ptr();
     34 #else
     35     #error Need to convert float array to SkScalar array before calling the following function.
     36 #endif
     37 
     38     interp->setKeyFrame(index, msec, scalars, blend);
     39 }
     40 
     41 static void Interpolator_setRepeatMirror(JNIEnv* env, jobject clazz, jlong interpHandle, jfloat repeatCount, jboolean mirror)
     42 {
     43     SkInterpolator* interp = reinterpret_cast<SkInterpolator*>(interpHandle);
     44     if (repeatCount > 32000)
     45         repeatCount = 32000;
     46 
     47     interp->setRepeatCount(repeatCount);
     48     interp->setMirror(mirror != 0);
     49 }
     50 
     51 static jint Interpolator_timeToValues(JNIEnv* env, jobject clazz, jlong interpHandle, jint msec, jfloatArray valueArray)
     52 {
     53     SkInterpolator* interp = reinterpret_cast<SkInterpolator*>(interpHandle);
     54     SkInterpolatorBase::Result result;
     55 
     56     float* values = valueArray ? env->GetFloatArrayElements(valueArray, NULL) : NULL;
     57     result = interp->timeToValues(msec, (SkScalar*)values);
     58 
     59     if (valueArray) {
     60         int n = env->GetArrayLength(valueArray);
     61         for (int i = 0; i < n; i++) {
     62             values[i] = SkScalarToFloat(*(SkScalar*)&values[i]);
     63         }
     64         env->ReleaseFloatArrayElements(valueArray, values, 0);
     65     }
     66 
     67     return static_cast<jint>(result);
     68 }
     69 
     70 // ----------------------------------------------------------------------------
     71 
     72 /*
     73  * JNI registration.
     74  */
     75 static JNINativeMethod gInterpolatorMethods[] = {
     76     { "nativeConstructor",      "(II)J",        (void*)Interpolator_constructor     },
     77     { "nativeDestructor",       "(J)V",         (void*)Interpolator_destructor      },
     78     { "nativeReset",            "(JII)V",       (void*)Interpolator_reset           },
     79     { "nativeSetKeyFrame",      "(JII[F[F)V",   (void*)Interpolator_setKeyFrame     },
     80     { "nativeSetRepeatMirror",  "(JFZ)V",       (void*)Interpolator_setRepeatMirror },
     81     { "nativeTimeToValues",     "(JI[F)I",      (void*)Interpolator_timeToValues    }
     82 };
     83 
     84 int register_android_graphics_Interpolator(JNIEnv* env)
     85 {
     86     return android::RegisterMethodsOrDie(env, "android/graphics/Interpolator",
     87                                          gInterpolatorMethods, NELEM(gInterpolatorMethods));
     88 }
     89