1 /* 2 ** 3 ** Copyright 2006, 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 #define LOG_TAG "9patch" 19 #define LOG_NDEBUG 1 20 21 #include <androidfw/ResourceTypes.h> 22 #include <hwui/Canvas.h> 23 #include <hwui/Paint.h> 24 #include <utils/Log.h> 25 26 #include "SkCanvas.h" 27 #include "SkLatticeIter.h" 28 #include "SkRegion.h" 29 #include "GraphicsJNI.h" 30 #include "NinePatchPeeker.h" 31 #include "NinePatchUtils.h" 32 33 #include <nativehelper/JNIHelp.h> 34 #include "core_jni_helpers.h" 35 36 jclass gInsetStruct_class; 37 jmethodID gInsetStruct_constructorMethodID; 38 39 using namespace android; 40 41 /** 42 * IMPORTANT NOTE: 9patch chunks can be manipuated either as an array of bytes 43 * or as a Res_png_9patch instance. It is important to note that the size of the 44 * array required to hold a 9patch chunk is greater than sizeof(Res_png_9patch). 45 * The code below manipulates chunks as Res_png_9patch* types to draw and as 46 * int8_t* to allocate and free the backing storage. 47 */ 48 49 class SkNinePatchGlue { 50 public: 51 static jboolean isNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) { 52 if (NULL == obj) { 53 return JNI_FALSE; 54 } 55 if (env->GetArrayLength(obj) < (int)sizeof(Res_png_9patch)) { 56 return JNI_FALSE; 57 } 58 const jbyte* array = env->GetByteArrayElements(obj, 0); 59 if (array != NULL) { 60 const Res_png_9patch* chunk = reinterpret_cast<const Res_png_9patch*>(array); 61 int8_t wasDeserialized = chunk->wasDeserialized; 62 env->ReleaseByteArrayElements(obj, const_cast<jbyte*>(array), JNI_ABORT); 63 return (wasDeserialized != -1) ? JNI_TRUE : JNI_FALSE; 64 } 65 return JNI_FALSE; 66 } 67 68 static jlong validateNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) { 69 size_t chunkSize = env->GetArrayLength(obj); 70 if (chunkSize < (int) (sizeof(Res_png_9patch))) { 71 jniThrowRuntimeException(env, "Array too small for chunk."); 72 return NULL; 73 } 74 75 int8_t* storage = new int8_t[chunkSize]; 76 // This call copies the content of the jbyteArray 77 env->GetByteArrayRegion(obj, 0, chunkSize, reinterpret_cast<jbyte*>(storage)); 78 // Deserialize in place, return the array we just allocated 79 return reinterpret_cast<jlong>(Res_png_9patch::deserialize(storage)); 80 } 81 82 static void finalize(JNIEnv* env, jobject, jlong patchHandle) { 83 int8_t* patch = reinterpret_cast<int8_t*>(patchHandle); 84 delete[] patch; 85 } 86 87 static jlong getTransparentRegion(JNIEnv* env, jobject, jlong bitmapPtr, 88 jlong chunkHandle, jobject dstRect) { 89 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle); 90 SkASSERT(chunk); 91 92 SkBitmap bitmap; 93 bitmap::toBitmap(bitmapPtr).getSkBitmap(&bitmap); 94 SkRect dst; 95 GraphicsJNI::jrect_to_rect(env, dstRect, &dst); 96 97 SkCanvas::Lattice lattice; 98 SkIRect src = SkIRect::MakeWH(bitmap.width(), bitmap.height()); 99 lattice.fBounds = &src; 100 NinePatchUtils::SetLatticeDivs(&lattice, *chunk, bitmap.width(), bitmap.height()); 101 lattice.fRectTypes = nullptr; 102 lattice.fColors = nullptr; 103 104 SkRegion* region = nullptr; 105 if (SkLatticeIter::Valid(bitmap.width(), bitmap.height(), lattice)) { 106 SkLatticeIter iter(lattice, dst); 107 if (iter.numRectsToDraw() == chunk->numColors) { 108 SkRect dummy; 109 SkRect iterDst; 110 int index = 0; 111 while (iter.next(&dummy, &iterDst)) { 112 if (0 == chunk->getColors()[index++] && !iterDst.isEmpty()) { 113 if (!region) { 114 region = new SkRegion(); 115 } 116 117 region->op(iterDst.round(), SkRegion::kUnion_Op); 118 } 119 } 120 } 121 } 122 123 return reinterpret_cast<jlong>(region); 124 } 125 126 }; 127 128 jobject NinePatchPeeker::createNinePatchInsets(JNIEnv* env, float scale) const { 129 if (!mHasInsets) { 130 return nullptr; 131 } 132 133 return env->NewObject(gInsetStruct_class, gInsetStruct_constructorMethodID, 134 mOpticalInsets[0], mOpticalInsets[1], 135 mOpticalInsets[2], mOpticalInsets[3], 136 mOutlineInsets[0], mOutlineInsets[1], 137 mOutlineInsets[2], mOutlineInsets[3], 138 mOutlineRadius, mOutlineAlpha, scale); 139 } 140 141 void NinePatchPeeker::getPadding(JNIEnv* env, jobject outPadding) const { 142 if (mPatch) { 143 GraphicsJNI::set_jrect(env, outPadding, 144 mPatch->paddingLeft, mPatch->paddingTop, 145 mPatch->paddingRight, mPatch->paddingBottom); 146 147 } else { 148 GraphicsJNI::set_jrect(env, outPadding, -1, -1, -1, -1); 149 } 150 } 151 152 ///////////////////////////////////////////////////////////////////////////////////////// 153 154 static const JNINativeMethod gNinePatchMethods[] = { 155 { "isNinePatchChunk", "([B)Z", (void*) SkNinePatchGlue::isNinePatchChunk }, 156 { "validateNinePatchChunk", "([B)J", 157 (void*) SkNinePatchGlue::validateNinePatchChunk }, 158 { "nativeFinalize", "(J)V", (void*) SkNinePatchGlue::finalize }, 159 { "nativeGetTransparentRegion", "(JJLandroid/graphics/Rect;)J", 160 (void*) SkNinePatchGlue::getTransparentRegion } 161 }; 162 163 int register_android_graphics_NinePatch(JNIEnv* env) { 164 gInsetStruct_class = MakeGlobalRefOrDie(env, FindClassOrDie(env, 165 "android/graphics/NinePatch$InsetStruct")); 166 gInsetStruct_constructorMethodID = GetMethodIDOrDie(env, gInsetStruct_class, "<init>", 167 "(IIIIIIIIFIF)V"); 168 return android::RegisterMethodsOrDie(env, 169 "android/graphics/NinePatch", gNinePatchMethods, NELEM(gNinePatchMethods)); 170 } 171
