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:
isNinePatchChunk(JNIEnv * env,jobject,jbyteArray obj)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 
validateNinePatchChunk(JNIEnv * env,jobject,jbyteArray obj)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 
finalize(JNIEnv * env,jobject,jlong patchHandle)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 
getTransparentRegion(JNIEnv * env,jobject,jobject jbitmap,jlong chunkHandle,jobject dstRect)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 
createNinePatchInsets(JNIEnv * env,float scale) const135 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 
getPadding(JNIEnv * env,jobject outPadding) const148 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 
register_android_graphics_NinePatch(JNIEnv * env)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