19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* libs/android_runtime/android/graphics/PathMeasure.cpp 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** Copyright 2007, The Android Open Source Project 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License"); 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** you may not use this file except in compliance with the License. 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** You may obtain a copy of the License at 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** http://www.apache.org/licenses/LICENSE-2.0 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** Unless required by applicable law or agreed to in writing, software 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** distributed under the License is distributed on an "AS IS" BASIS, 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** See the License for the specific language governing permissions and 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project** limitations under the License. 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project*/ 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include "jni.h" 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include "GraphicsJNI.h" 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <android_runtime/AndroidRuntime.h> 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include "SkPathMeasure.h" 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* We declare an explicit pair, so that we don't have to rely on the java 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project client to be sure not to edit the path while we have an active measure 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project object associated with it. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project This costs us the copy of the path, for the sake of not allowing a bad 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project java client to randomly crash (since we can't detect the case where the 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project native path has been modified). 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project The C side does have this risk, but it chooses for speed over safety. If it 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project later changes this, and is internally safe from changes to the path, then 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project we can remove this explicit copy from our JNI code. 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Note that we do not have a reference on the java side to the java path. 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Were we to not need the native copy here, we would want to add a java 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project reference, so that the java path would not get GD'd while the measure object 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project was still alive. 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project*/ 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstruct PathMeasurePair { 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PathMeasurePair() {} 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project PathMeasurePair(const SkPath& path, bool forceClosed) 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project : fPath(path), fMeasure(fPath, forceClosed) {} 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SkPath fPath; // copy of the user's path 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SkPathMeasure fMeasure; // this guy points to fPath 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}; 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectnamespace android { 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectclass SkPathMeasureGlue { 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic: 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static PathMeasurePair* create(JNIEnv* env, jobject clazz, const SkPath* path, jboolean forceClosed) { 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return path ? new PathMeasurePair(*path, forceClosed) : new PathMeasurePair; 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static void setPath(JNIEnv* env, jobject clazz, PathMeasurePair* pair, const SkPath* path, jboolean forceClosed) { 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (NULL == path) { 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pair->fPath.reset(); 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pair->fPath = *path; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pair->fMeasure.setPath(&pair->fPath, forceClosed); 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static jfloat getLength(JNIEnv* env, jobject clazz, PathMeasurePair* pair) { 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return SkScalarToFloat(pair->fMeasure.getLength()); 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static void convertTwoElemFloatArray(JNIEnv* env, jfloatArray array, const SkScalar src[2]) { 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project AutoJavaFloatArray autoArray(env, array, 2); 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jfloat* ptr = autoArray.ptr(); 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ptr[0] = SkScalarToFloat(src[0]); 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ptr[1] = SkScalarToFloat(src[1]); 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static jboolean getPosTan(JNIEnv* env, jobject clazz, PathMeasurePair* pair, jfloat dist, jfloatArray pos, jfloatArray tan) { 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SkScalar tmpPos[2], tmpTan[2]; 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SkScalar* posPtr = pos ? tmpPos : NULL; 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SkScalar* tanPtr = tan ? tmpTan : NULL; 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!pair->fMeasure.getPosTan(SkFloatToScalar(dist), (SkPoint*)posPtr, (SkVector*)tanPtr)) { 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (pos) { 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project convertTwoElemFloatArray(env, pos, tmpPos); 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (tan) { 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project convertTwoElemFloatArray(env, tan, tmpTan); 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static jboolean getMatrix(JNIEnv* env, jobject clazz, PathMeasurePair* pair, jfloat dist, 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project SkMatrix* matrix, int flags) { 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pair->fMeasure.getMatrix(SkFloatToScalar(dist), matrix, (SkPathMeasure::MatrixFlags)flags); 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static jboolean getSegment(JNIEnv* env, jobject clazz, PathMeasurePair* pair, jfloat startF, 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project jfloat stopF, SkPath* dst, jboolean startWithMoveTo) { 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pair->fMeasure.getSegment(SkFloatToScalar(startF), SkFloatToScalar(stopF), dst, startWithMoveTo); 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static jboolean isClosed(JNIEnv* env, jobject clazz, PathMeasurePair* pair) { 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pair->fMeasure.isClosed(); 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static jboolean nextContour(JNIEnv* env, jobject clazz, PathMeasurePair* pair) { 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return pair->fMeasure.nextContour(); 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static void destroy(JNIEnv* env, jobject clazz, PathMeasurePair* pair) { 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project delete pair; 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}; 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectstatic JNINativeMethod methods[] = { 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_create", "(IZ)I", (void*) SkPathMeasureGlue::create }, 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_setPath", "(IIZ)V", (void*) SkPathMeasureGlue::setPath }, 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_getLength", "(I)F", (void*) SkPathMeasureGlue::getLength }, 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_getPosTan", "(IF[F[F)Z", (void*) SkPathMeasureGlue::getPosTan }, 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_getMatrix", "(IFII)Z", (void*) SkPathMeasureGlue::getMatrix }, 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_getSegment", "(IFFIZ)Z", (void*) SkPathMeasureGlue::getSegment }, 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_isClosed", "(I)Z", (void*) SkPathMeasureGlue::isClosed }, 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_nextContour", "(I)Z", (void*) SkPathMeasureGlue::nextContour }, 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project {"native_destroy", "(I)V", (void*) SkPathMeasureGlue::destroy } 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project}; 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectint register_android_graphics_PathMeasure(JNIEnv* env) { 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/PathMeasure", methods, 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project sizeof(methods) / sizeof(methods[0])); 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return result; 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 139