The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* libs/android_runtime/android/graphics/PathMeasure.cpp |
| 2 | ** |
| 3 | ** Copyright 2007, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "jni.h" |
| 19 | #include "GraphicsJNI.h" |
| 20 | #include <android_runtime/AndroidRuntime.h> |
| 21 | |
| 22 | #include "SkPathMeasure.h" |
| 23 | |
| 24 | /* We declare an explicit pair, so that we don't have to rely on the java |
| 25 | client to be sure not to edit the path while we have an active measure |
| 26 | object associated with it. |
| 27 | |
| 28 | This costs us the copy of the path, for the sake of not allowing a bad |
| 29 | java client to randomly crash (since we can't detect the case where the |
| 30 | native path has been modified). |
| 31 | |
| 32 | The C side does have this risk, but it chooses for speed over safety. If it |
| 33 | later changes this, and is internally safe from changes to the path, then |
| 34 | we can remove this explicit copy from our JNI code. |
| 35 | |
| 36 | Note that we do not have a reference on the java side to the java path. |
| 37 | Were we to not need the native copy here, we would want to add a java |
| 38 | reference, so that the java path would not get GD'd while the measure object |
| 39 | was still alive. |
| 40 | */ |
| 41 | struct PathMeasurePair { |
| 42 | PathMeasurePair() {} |
| 43 | PathMeasurePair(const SkPath& path, bool forceClosed) |
| 44 | : fPath(path), fMeasure(fPath, forceClosed) {} |
| 45 | |
| 46 | SkPath fPath; // copy of the user's path |
| 47 | SkPathMeasure fMeasure; // this guy points to fPath |
| 48 | }; |
| 49 | |
| 50 | namespace android { |
| 51 | |
| 52 | class SkPathMeasureGlue { |
| 53 | public: |
| 54 | |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 55 | static jlong create(JNIEnv* env, jobject clazz, jlong pathHandle, |
| 56 | jboolean forceClosedHandle) { |
| 57 | const SkPath* path = reinterpret_cast<SkPath*>(pathHandle); |
| 58 | bool forceClosed = (forceClosedHandle == JNI_TRUE); |
| 59 | PathMeasurePair* pair; |
| 60 | if(path) |
| 61 | pair = new PathMeasurePair(*path, forceClosed); |
| 62 | else |
| 63 | pair = new PathMeasurePair; |
| 64 | return reinterpret_cast<jlong>(pair); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 65 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 66 | |
| 67 | static void setPath(JNIEnv* env, jobject clazz, jlong pairHandle, |
| 68 | jlong pathHandle, jboolean forceClosedHandle) { |
| 69 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
| 70 | const SkPath* path = reinterpret_cast<SkPath*>(pathHandle); |
| 71 | bool forceClosed = (forceClosedHandle == JNI_TRUE); |
| 72 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 73 | if (NULL == path) { |
| 74 | pair->fPath.reset(); |
| 75 | } else { |
| 76 | pair->fPath = *path; |
| 77 | } |
| 78 | pair->fMeasure.setPath(&pair->fPath, forceClosed); |
| 79 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 80 | |
| 81 | static jfloat getLength(JNIEnv* env, jobject clazz, jlong pairHandle) { |
| 82 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
| 83 | return static_cast<jfloat>(SkScalarToFloat(pair->fMeasure.getLength())); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 84 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 85 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 86 | static void convertTwoElemFloatArray(JNIEnv* env, jfloatArray array, const SkScalar src[2]) { |
| 87 | AutoJavaFloatArray autoArray(env, array, 2); |
| 88 | jfloat* ptr = autoArray.ptr(); |
| 89 | ptr[0] = SkScalarToFloat(src[0]); |
| 90 | ptr[1] = SkScalarToFloat(src[1]); |
| 91 | } |
| 92 | |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 93 | static jboolean getPosTan(JNIEnv* env, jobject clazz, jlong pairHandle, jfloat dist, jfloatArray pos, jfloatArray tan) { |
| 94 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 95 | SkScalar tmpPos[2], tmpTan[2]; |
| 96 | SkScalar* posPtr = pos ? tmpPos : NULL; |
| 97 | SkScalar* tanPtr = tan ? tmpTan : NULL; |
| 98 | |
| 99 | if (!pair->fMeasure.getPosTan(SkFloatToScalar(dist), (SkPoint*)posPtr, (SkVector*)tanPtr)) { |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 100 | return JNI_FALSE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | if (pos) { |
| 104 | convertTwoElemFloatArray(env, pos, tmpPos); |
| 105 | } |
| 106 | if (tan) { |
| 107 | convertTwoElemFloatArray(env, tan, tmpTan); |
| 108 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 109 | return JNI_TRUE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 110 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 111 | |
| 112 | static jboolean getMatrix(JNIEnv* env, jobject clazz, jlong pairHandle, jfloat dist, |
| 113 | jlong matrixHandle, jint flags) { |
| 114 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
| 115 | SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle); |
| 116 | bool result = pair->fMeasure.getMatrix(SkFloatToScalar(dist), matrix, (SkPathMeasure::MatrixFlags)flags); |
| 117 | return result ? JNI_TRUE : JNI_FALSE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 118 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 119 | |
| 120 | static jboolean getSegment(JNIEnv* env, jobject clazz, jlong pairHandle, jfloat startF, |
| 121 | jfloat stopF, jlong dstHandle, jboolean startWithMoveTo) { |
| 122 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
| 123 | SkPath* dst = reinterpret_cast<SkPath*>(dstHandle); |
| 124 | bool result = pair->fMeasure.getSegment(SkFloatToScalar(startF), SkFloatToScalar(stopF), dst, startWithMoveTo); |
| 125 | return result ? JNI_TRUE : JNI_FALSE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 126 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 127 | |
| 128 | static jboolean isClosed(JNIEnv* env, jobject clazz, jlong pairHandle) { |
| 129 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
| 130 | bool result = pair->fMeasure.isClosed(); |
| 131 | return result ? JNI_TRUE : JNI_FALSE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 132 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 133 | |
| 134 | static jboolean nextContour(JNIEnv* env, jobject clazz, jlong pairHandle) { |
| 135 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
| 136 | bool result = pair->fMeasure.nextContour(); |
| 137 | return result ? JNI_TRUE : JNI_FALSE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 138 | } |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 139 | |
| 140 | static void destroy(JNIEnv* env, jobject clazz, jlong pairHandle) { |
| 141 | PathMeasurePair* pair = reinterpret_cast<PathMeasurePair*>(pairHandle); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 142 | delete pair; |
| 143 | } |
| 144 | }; |
| 145 | |
| 146 | static JNINativeMethod methods[] = { |
Ashok Bhat | 0c10cc6 | 2014-01-10 18:38:39 +0000 | [diff] [blame] | 147 | {"native_create", "(JZ)J", (void*) SkPathMeasureGlue::create }, |
| 148 | {"native_setPath", "(JJZ)V", (void*) SkPathMeasureGlue::setPath }, |
| 149 | {"native_getLength", "(J)F", (void*) SkPathMeasureGlue::getLength }, |
| 150 | {"native_getPosTan", "(JF[F[F)Z", (void*) SkPathMeasureGlue::getPosTan }, |
| 151 | {"native_getMatrix", "(JFJI)Z", (void*) SkPathMeasureGlue::getMatrix }, |
| 152 | {"native_getSegment", "(JFFJZ)Z", (void*) SkPathMeasureGlue::getSegment }, |
| 153 | {"native_isClosed", "(J)Z", (void*) SkPathMeasureGlue::isClosed }, |
| 154 | {"native_nextContour", "(J)Z", (void*) SkPathMeasureGlue::nextContour }, |
| 155 | {"native_destroy", "(J)V", (void*) SkPathMeasureGlue::destroy } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 156 | }; |
| 157 | |
| 158 | int register_android_graphics_PathMeasure(JNIEnv* env) { |
| 159 | int result = AndroidRuntime::registerNativeMethods(env, "android/graphics/PathMeasure", methods, |
| 160 | sizeof(methods) / sizeof(methods[0])); |
| 161 | return result; |
| 162 | } |
| 163 | |
| 164 | } |