core/jni/android/graphics/Matrix.cpp

/* libs/android_runtime/android/graphics/Matrix.cpp
**
** Copyright 2006, 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.
*/

#include "jni.h"
#include "GraphicsJNI.h"
#include <android_runtime/AndroidRuntime.h>

#include "SkMatrix.h"
#include "SkTemplates.h"

#include "Matrix.h"

#include <Caches.h>

namespace android {

class SkMatrixGlue {
public:

    static void finalizer(JNIEnv* env, jobject clazz, jlong objHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        delete obj;
    }

    static jlong create(JNIEnv* env, jobject clazz, jlong srcHandle) {
        const SkMatrix* src = reinterpret_cast<SkMatrix*>(srcHandle);
        SkMatrix* obj = new SkMatrix();
        if (src)
            *obj = *src;
        else
            obj->reset();
        return reinterpret_cast<jlong>(obj);
    }

    static jboolean isIdentity(JNIEnv* env, jobject clazz, jlong objHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        return obj->isIdentity() ? JNI_TRUE : JNI_FALSE;
    }
    static jboolean rectStaysRect(JNIEnv* env, jobject clazz, jlong objHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        return obj->rectStaysRect() ? JNI_TRUE : JNI_FALSE;
    }
    static void reset(JNIEnv* env, jobject clazz, jlong objHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        obj->reset();
    }
     static void set(JNIEnv* env, jobject clazz, jlong objHandle, jlong otherHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkMatrix* other = reinterpret_cast<SkMatrix*>(otherHandle);
        *obj = *other;
    }
     static void setTranslate(JNIEnv* env, jobject clazz, jlong objHandle, jfloat dx, jfloat dy) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar dx_ = SkFloatToScalar(dx);
        SkScalar dy_ = SkFloatToScalar(dy);
        obj->setTranslate(dx_, dy_);
    }
     static void setScale__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sx, jfloat sy, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        obj->setScale(sx_, sy_, px_, py_);
    }
     static void setScale__FF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sx, jfloat sy) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        obj->setScale(sx_, sy_);
    }
     static void setRotate__FFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat degrees, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        obj->setRotate(degrees_, px_, py_);
    }
     static void setRotate__F(JNIEnv* env, jobject clazz, jlong objHandle, jfloat degrees) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        obj->setRotate(degrees_);
    }
     static void setSinCos__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sinValue, jfloat cosValue, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sinValue_ = SkFloatToScalar(sinValue);
        SkScalar cosValue_ = SkFloatToScalar(cosValue);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        obj->setSinCos(sinValue_, cosValue_, px_, py_);
    }
     static void setSinCos__FF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sinValue, jfloat cosValue) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sinValue_ = SkFloatToScalar(sinValue);
        SkScalar cosValue_ = SkFloatToScalar(cosValue);
        obj->setSinCos(sinValue_, cosValue_);
    }
     static void setSkew__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat kx, jfloat ky, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar kx_ = SkFloatToScalar(kx);
        SkScalar ky_ = SkFloatToScalar(ky);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        obj->setSkew(kx_, ky_, px_, py_);
    }
     static void setSkew__FF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat kx, jfloat ky) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar kx_ = SkFloatToScalar(kx);
        SkScalar ky_ = SkFloatToScalar(ky);
        obj->setSkew(kx_, ky_);
    }
     static jboolean setConcat(JNIEnv* env, jobject clazz, jlong objHandle, jlong aHandle, jlong bHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkMatrix* a = reinterpret_cast<SkMatrix*>(aHandle);
        SkMatrix* b = reinterpret_cast<SkMatrix*>(bHandle);
        return obj->setConcat(*a, *b) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preTranslate(JNIEnv* env, jobject clazz, jlong objHandle, jfloat dx, jfloat dy) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar dx_ = SkFloatToScalar(dx);
        SkScalar dy_ = SkFloatToScalar(dy);
        return obj->preTranslate(dx_, dy_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preScale__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sx, jfloat sy, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        return obj->preScale(sx_, sy_, px_, py_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preScale__FF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sx, jfloat sy) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        return obj->preScale(sx_, sy_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preRotate__FFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat degrees, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        return obj->preRotate(degrees_, px_, py_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preRotate__F(JNIEnv* env, jobject clazz, jlong objHandle, jfloat degrees) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        return obj->preRotate(degrees_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preSkew__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat kx, jfloat ky, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar kx_ = SkFloatToScalar(kx);
        SkScalar ky_ = SkFloatToScalar(ky);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        return obj->preSkew(kx_, ky_, px_, py_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preSkew__FF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat kx, jfloat ky) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar kx_ = SkFloatToScalar(kx);
        SkScalar ky_ = SkFloatToScalar(ky);
        return obj->preSkew(kx_, ky_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean preConcat(JNIEnv* env, jobject clazz, jlong objHandle, jlong otherHandle) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkMatrix* other = reinterpret_cast<SkMatrix*>(otherHandle);
        return obj->preConcat(*other) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postTranslate(JNIEnv* env, jobject clazz, jlong objHandle, jfloat dx, jfloat dy) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar dx_ = SkFloatToScalar(dx);
        SkScalar dy_ = SkFloatToScalar(dy);
        return obj->postTranslate(dx_, dy_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postScale__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sx, jfloat sy, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        return obj->postScale(sx_, sy_, px_, py_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postScale__FF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat sx, jfloat sy) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar sx_ = SkFloatToScalar(sx);
        SkScalar sy_ = SkFloatToScalar(sy);
        return obj->postScale(sx_, sy_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postRotate__FFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat degrees, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        return obj->postRotate(degrees_, px_, py_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postRotate__F(JNIEnv* env, jobject clazz, jlong objHandle, jfloat degrees) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar degrees_ = SkFloatToScalar(degrees);
        return obj->postRotate(degrees_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postSkew__FFFF(JNIEnv* env, jobject clazz, jlong objHandle, jfloat kx, jfloat ky, jfloat px, jfloat py) {
        SkMatrix* obj = reinterpret_cast<SkMatrix*>(objHandle);
        SkScalar kx_ = SkFloatToScalar(kx);
        SkScalar ky_ = SkFloatToScalar(ky);
        SkScalar px_ = SkFloatToScalar(px);
        SkScalar py_ = SkFloatToScalar(py);
        return obj->postSkew(kx_, ky_, px_, py_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postSkew__FF(JNIEnv* env, jobject clazz, jlong matrixHandle, jfloat kx, jfloat ky) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkScalar kx_ = SkFloatToScalar(kx);
        SkScalar ky_ = SkFloatToScalar(ky);
        return matrix->postSkew(kx_, ky_) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean postConcat(JNIEnv* env, jobject clazz, jlong matrixHandle, jlong otherHandle) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkMatrix* other = reinterpret_cast<SkMatrix*>(otherHandle);
        return matrix->postConcat(*other) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean setRectToRect(JNIEnv* env, jobject clazz, jlong matrixHandle, jobject src, jobject dst, jint stfHandle) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkMatrix::ScaleToFit stf = static_cast<SkMatrix::ScaleToFit>(stfHandle);
        SkRect src_;
        GraphicsJNI::jrectf_to_rect(env, src, &src_);
        SkRect dst_;
        GraphicsJNI::jrectf_to_rect(env, dst, &dst_);
        return matrix->setRectToRect(src_, dst_, stf) ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean setPolyToPoly(JNIEnv* env, jobject clazz, jlong matrixHandle,
                                  jfloatArray jsrc, jint srcIndex,
                                  jfloatArray jdst, jint dstIndex, jint ptCount) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkASSERT(srcIndex >= 0);
        SkASSERT(dstIndex >= 0);
        SkASSERT((unsigned)ptCount <= 4);

        AutoJavaFloatArray autoSrc(env, jsrc, srcIndex + (ptCount << 1), kRO_JNIAccess);
        AutoJavaFloatArray autoDst(env, jdst, dstIndex + (ptCount << 1), kRW_JNIAccess);
        float* src = autoSrc.ptr() + srcIndex;
        float* dst = autoDst.ptr() + dstIndex;
        bool result;

#ifdef SK_SCALAR_IS_FIXED        
        SkPoint srcPt[4], dstPt[4];
        for (int i = 0; i < ptCount; i++) {
            int x = i << 1;
            int y = x + 1;
            srcPt[i].set(SkFloatToScalar(src[x]), SkFloatToScalar(src[y]));
            dstPt[i].set(SkFloatToScalar(dst[x]), SkFloatToScalar(dst[y]));
        }
        result = matrix->setPolyToPoly(srcPt, dstPt, ptCount);
#else
        result = matrix->setPolyToPoly((const SkPoint*)src, (const SkPoint*)dst,
                                     ptCount);
#endif
        return result ? JNI_TRUE : JNI_FALSE;
    }

    static jboolean invert(JNIEnv* env, jobject clazz, jlong matrixHandle, jlong inverseHandle) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkMatrix* inverse = reinterpret_cast<SkMatrix*>(inverseHandle);
        return matrix->invert(inverse);
    }

    static void mapPoints(JNIEnv* env, jobject clazz, jlong matrixHandle,
                              jfloatArray dst, jint dstIndex,
                              jfloatArray src, jint srcIndex,
                              jint ptCount, jboolean isPts) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkASSERT(ptCount >= 0);
        AutoJavaFloatArray autoSrc(env, src, srcIndex + (ptCount << 1), kRO_JNIAccess);
        AutoJavaFloatArray autoDst(env, dst, dstIndex + (ptCount << 1), kRW_JNIAccess);
        float* srcArray = autoSrc.ptr() + srcIndex;
        float* dstArray = autoDst.ptr() + dstIndex;
        
#ifdef SK_SCALAR_IS_FIXED        
        // we allocate twice the count, 1 set for src, 1 for dst
        SkAutoSTMalloc<32, SkPoint> storage(ptCount * 2);
        SkPoint* pts = storage.get();
        SkPoint* srcPt = pts;
        SkPoint* dstPt = pts + ptCount;
        
        int i;
        for (i = 0; i < ptCount; i++) {
            srcPt[i].set(SkFloatToScalar(srcArray[i << 1]),
                         SkFloatToScalar(srcArray[(i << 1) + 1]));
        }
        
        if (isPts)
            matrix->mapPoints(dstPt, srcPt, ptCount);
        else
            matrix->mapVectors(dstPt, srcPt, ptCount);
        
        for (i = 0; i < ptCount; i++) {
            dstArray[i << 1]  = SkScalarToFloat(dstPt[i].fX);
            dstArray[(i << 1) + 1]  = SkScalarToFloat(dstPt[i].fY);
        }
#else
        if (isPts)
            matrix->mapPoints((SkPoint*)dstArray, (const SkPoint*)srcArray,
                              ptCount);
        else
            matrix->mapVectors((SkVector*)dstArray, (const SkVector*)srcArray,
                               ptCount);
#endif
    }

    static jboolean mapRect__RectFRectF(JNIEnv* env, jobject clazz, jlong matrixHandle, jobjectArray dst, jobject src) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        SkRect dst_, src_;
        GraphicsJNI::jrectf_to_rect(env, src, &src_);
        jboolean rectStaysRect = matrix->mapRect(&dst_, src_);
        GraphicsJNI::rect_to_jrectf(dst_, env, dst);
        return rectStaysRect ? JNI_TRUE : JNI_FALSE;
    }

    static jfloat mapRadius(JNIEnv* env, jobject clazz, jlong matrixHandle, jfloat radius) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        float result;
        result = SkScalarToFloat(matrix->mapRadius(SkFloatToScalar(radius)));
        return static_cast<jfloat>(result);
    }

    static void getValues(JNIEnv* env, jobject clazz, jlong matrixHandle, jfloatArray values) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        AutoJavaFloatArray autoValues(env, values, 9, kRW_JNIAccess);
        float* dst = autoValues.ptr();

#ifdef SK_SCALAR_IS_FIXED
        for (int i = 0; i < 6; i++) {
            dst[i] = SkFixedToFloat(matrix->get(i));
        }
        for (int j = 6; j < 9; j++) {
            dst[j] = SkFractToFloat(matrix->get(j));
        }
#else
        for (int i = 0; i < 9; i++) {
            dst[i] = matrix->get(i);
        }
#endif
    }

    static void setValues(JNIEnv* env, jobject clazz, jlong matrixHandle, jfloatArray values) {
        SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
        AutoJavaFloatArray autoValues(env, values, 9, kRO_JNIAccess);
        const float* src = autoValues.ptr();

#ifdef SK_SCALAR_IS_FIXED
        for (int i = 0; i < 6; i++) {
            matrix->set(i, SkFloatToFixed(src[i]));
        }
        for (int j = 6; j < 9; j++) {
            matrix->set(j, SkFloatToFract(src[j]));
        }
#else
        for (int i = 0; i < 9; i++) {
            matrix->set(i, src[i]);
        }
#endif
    }

    static jboolean equals(JNIEnv* env, jobject clazz, jlong aHandle, jlong bHandle) {
        const SkMatrix* a = reinterpret_cast<SkMatrix*>(aHandle);
        const SkMatrix* b = reinterpret_cast<SkMatrix*>(bHandle);
        return *a == *b;
    }
 };

static JNINativeMethod methods[] = {
    {"finalizer", "(J)V", (void*) SkMatrixGlue::finalizer},
    {"native_create","(J)J", (void*) SkMatrixGlue::create},
    {"native_isIdentity","(J)Z", (void*) SkMatrixGlue::isIdentity},
    {"native_rectStaysRect","(J)Z", (void*) SkMatrixGlue::rectStaysRect},
    {"native_reset","(J)V", (void*) SkMatrixGlue::reset},
    {"native_set","(JJ)V", (void*) SkMatrixGlue::set},
    {"native_setTranslate","(JFF)V", (void*) SkMatrixGlue::setTranslate},
    {"native_setScale","(JFFFF)V", (void*) SkMatrixGlue::setScale__FFFF},
    {"native_setScale","(JFF)V", (void*) SkMatrixGlue::setScale__FF},
    {"native_setRotate","(JFFF)V", (void*) SkMatrixGlue::setRotate__FFF},
    {"native_setRotate","(JF)V", (void*) SkMatrixGlue::setRotate__F},
    {"native_setSinCos","(JFFFF)V", (void*) SkMatrixGlue::setSinCos__FFFF},
    {"native_setSinCos","(JFF)V", (void*) SkMatrixGlue::setSinCos__FF},
    {"native_setSkew","(JFFFF)V", (void*) SkMatrixGlue::setSkew__FFFF},
    {"native_setSkew","(JFF)V", (void*) SkMatrixGlue::setSkew__FF},
    {"native_setConcat","(JJJ)Z", (void*) SkMatrixGlue::setConcat},
    {"native_preTranslate","(JFF)Z", (void*) SkMatrixGlue::preTranslate},
    {"native_preScale","(JFFFF)Z", (void*) SkMatrixGlue::preScale__FFFF},
    {"native_preScale","(JFF)Z", (void*) SkMatrixGlue::preScale__FF},
    {"native_preRotate","(JFFF)Z", (void*) SkMatrixGlue::preRotate__FFF},
    {"native_preRotate","(JF)Z", (void*) SkMatrixGlue::preRotate__F},
    {"native_preSkew","(JFFFF)Z", (void*) SkMatrixGlue::preSkew__FFFF},
    {"native_preSkew","(JFF)Z", (void*) SkMatrixGlue::preSkew__FF},
    {"native_preConcat","(JJ)Z", (void*) SkMatrixGlue::preConcat},
    {"native_postTranslate","(JFF)Z", (void*) SkMatrixGlue::postTranslate},
    {"native_postScale","(JFFFF)Z", (void*) SkMatrixGlue::postScale__FFFF},
    {"native_postScale","(JFF)Z", (void*) SkMatrixGlue::postScale__FF},
    {"native_postRotate","(JFFF)Z", (void*) SkMatrixGlue::postRotate__FFF},
    {"native_postRotate","(JF)Z", (void*) SkMatrixGlue::postRotate__F},
    {"native_postSkew","(JFFFF)Z", (void*) SkMatrixGlue::postSkew__FFFF},
    {"native_postSkew","(JFF)Z", (void*) SkMatrixGlue::postSkew__FF},
    {"native_postConcat","(JJ)Z", (void*) SkMatrixGlue::postConcat},
    {"native_setRectToRect","(JLandroid/graphics/RectF;Landroid/graphics/RectF;I)Z", (void*) SkMatrixGlue::setRectToRect},
    {"native_setPolyToPoly","(J[FI[FII)Z", (void*) SkMatrixGlue::setPolyToPoly},
    {"native_invert","(JJ)Z", (void*) SkMatrixGlue::invert},
    {"native_mapPoints","(J[FI[FIIZ)V", (void*) SkMatrixGlue::mapPoints},
    {"native_mapRect","(JLandroid/graphics/RectF;Landroid/graphics/RectF;)Z", (void*) SkMatrixGlue::mapRect__RectFRectF},
    {"native_mapRadius","(JF)F", (void*) SkMatrixGlue::mapRadius},
    {"native_getValues","(J[F)V", (void*) SkMatrixGlue::getValues},
    {"native_setValues","(J[F)V", (void*) SkMatrixGlue::setValues},
    {"native_equals", "(JJ)Z", (void*) SkMatrixGlue::equals}
};

static jfieldID sNativeInstanceField;

int register_android_graphics_Matrix(JNIEnv* env) {
    int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/Matrix", methods,
        sizeof(methods) / sizeof(methods[0]));

    jclass clazz = env->FindClass("android/graphics/Matrix");
    sNativeInstanceField = env->GetFieldID(clazz, "native_instance", "J");

    return result;
}

SkMatrix* android_graphics_Matrix_getSkMatrix(JNIEnv* env, jobject matrixObj) {
    return reinterpret_cast<SkMatrix*>(env->GetLongField(matrixObj, sNativeInstanceField));
}

}