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 <ResourceCache.h> 27 28 #include "SkCanvas.h" 29 #include "SkLatticeIter.h" 30 #include "SkRegion.h" 31 #include "GraphicsJNI.h" 32 #include "NinePatchPeeker.h" 33 #include "NinePatchUtils.h" 34 35 #include <nativehelper/JNIHelp.h> 36 #include "core_jni_helpers.h" 37 38 jclass gInsetStruct_class; 39 jmethodID gInsetStruct_constructorMethodID; 40 41 using namespace android; 42 43 /** 44 * IMPORTANT NOTE: 9patch chunks can be manipuated either as an array of bytes 45 * or as a Res_png_9patch instance. It is important to note that the size of the 46 * array required to hold a 9patch chunk is greater than sizeof(Res_png_9patch). 47 * The code below manipulates chunks as Res_png_9patch* types to draw and as 48 * int8_t* to allocate and free the backing storage. 49 */ 50 51 class SkNinePatchGlue { 52 public: 53 static jboolean isNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) { 54 if (NULL == obj) { 55 return JNI_FALSE; 56 } 57 if (env->GetArrayLength(obj) < (int)sizeof(Res_png_9patch)) { 58 return JNI_FALSE; 59 } 60 const jbyte* array = env->GetByteArrayElements(obj, 0); 61 if (array != NULL) { 62 const Res_png_9patch* chunk = reinterpret_cast<const Res_png_9patch*>(array); 63 int8_t wasDeserialized = chunk->wasDeserialized; 64 env->ReleaseByteArrayElements(obj, const_cast<jbyte*>(array), JNI_ABORT); 65 return (wasDeserialized != -1) ? JNI_TRUE : JNI_FALSE; 66 } 67 return JNI_FALSE; 68 } 69 70 static jlong validateNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) { 71 size_t chunkSize = env->GetArrayLength(obj); 72 if (chunkSize < (int) (sizeof(Res_png_9patch))) { 73 jniThrowRuntimeException(env, "Array too small for chunk."); 74 return NULL; 75 } 76 77 int8_t* storage = new int8_t[chunkSize]; 78 // This call copies the content of the jbyteArray 79 env->GetByteArrayRegion(obj, 0, chunkSize, reinterpret_cast<jbyte*>(storage)); 80 // Deserialize in place, return the array we just allocated 81 return reinterpret_cast<jlong>(Res_png_9patch::deserialize(storage)); 82 } 83 84 static void finalize(JNIEnv* env, jobject, jlong patchHandle) { 85 int8_t* patch = reinterpret_cast<int8_t*>(patchHandle); 86 if (android::uirenderer::ResourceCache::hasInstance()) { 87 Res_png_9patch* p = (Res_png_9patch*) patch; 88 android::uirenderer::ResourceCache::getInstance().destructor(p); 89 } else { 90 delete[] patch; 91 } 92 } 93 94 static jlong getTransparentRegion(JNIEnv* env, jobject, jobject jbitmap, 95 jlong chunkHandle, jobject dstRect) { 96 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle); 97 SkASSERT(chunk); 98 99 SkBitmap bitmap; 100 GraphicsJNI::getSkBitmap(env, jbitmap, &bitmap); 101 SkRect dst; 102 GraphicsJNI::jrect_to_rect(env, dstRect, &dst); 103 104 SkCanvas::Lattice lattice; 105 SkIRect src = SkIRect::MakeWH(bitmap.width(), bitmap.height()); 106 lattice.fBounds = &src; 107 NinePatchUtils::SetLatticeDivs(&lattice, *chunk, bitmap.width(), bitmap.height()); 108 lattice.fRectTypes = nullptr; 109 lattice.fColors = nullptr; 110 111 SkRegion* region = nullptr; 112 if (SkLatticeIter::Valid(bitmap.width(), bitmap.height(), lattice)) { 113 SkLatticeIter iter(lattice, dst); 114 if (iter.numRectsToDraw() == chunk->numColors) { 115 SkRect dummy; 116 SkRect iterDst; 117 int index = 0; 118 while (iter.next(&dummy, &iterDst)) { 119 if (0 == chunk->getColors()[index++] && !iterDst.isEmpty()) { 120 if (!region) { 121 region = new SkRegion(); 122 } 123 124 region->op(iterDst.round(), SkRegion::kUnion_Op); 125 } 126 } 127 } 128 } 129 130 return reinterpret_cast<jlong>(region); 131 } 132 133 }; 134 135 jobject NinePatchPeeker::createNinePatchInsets(JNIEnv* env, float scale) const { 136 if (!mHasInsets) { 137 return nullptr; 138 } 139 140 return env->NewObject(gInsetStruct_class, gInsetStruct_constructorMethodID, 141 mOpticalInsets[0], mOpticalInsets[1], 142 mOpticalInsets[2], mOpticalInsets[3], 143 mOutlineInsets[0], mOutlineInsets[1], 144 mOutlineInsets[2], mOutlineInsets[3], 145 mOutlineRadius, mOutlineAlpha, scale); 146 } 147 148 void NinePatchPeeker::getPadding(JNIEnv* env, jobject outPadding) const { 149 if (mPatch) { 150 GraphicsJNI::set_jrect(env, outPadding, 151 mPatch->paddingLeft, mPatch->paddingTop, 152 mPatch->paddingRight, mPatch->paddingBottom); 153 154 } else { 155 GraphicsJNI::set_jrect(env, outPadding, -1, -1, -1, -1); 156 } 157 } 158 159 ///////////////////////////////////////////////////////////////////////////////////////// 160 161 static const JNINativeMethod gNinePatchMethods[] = { 162 { "isNinePatchChunk", "([B)Z", (void*) SkNinePatchGlue::isNinePatchChunk }, 163 { "validateNinePatchChunk", "([B)J", 164 (void*) SkNinePatchGlue::validateNinePatchChunk }, 165 { "nativeFinalize", "(J)V", (void*) SkNinePatchGlue::finalize }, 166 { "nativeGetTransparentRegion", "(Landroid/graphics/Bitmap;JLandroid/graphics/Rect;)J", 167 (void*) SkNinePatchGlue::getTransparentRegion } 168 }; 169 170 int register_android_graphics_NinePatch(JNIEnv* env) { 171 gInsetStruct_class = MakeGlobalRefOrDie(env, FindClassOrDie(env, 172 "android/graphics/NinePatch$InsetStruct")); 173 gInsetStruct_constructorMethodID = GetMethodIDOrDie(env, gInsetStruct_class, "<init>", 174 "(IIIIIIIIFIF)V"); 175 return android::RegisterMethodsOrDie(env, 176 "android/graphics/NinePatch", gNinePatchMethods, NELEM(gNinePatchMethods)); 177 } 178
