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 #undef LOG_TAG
19 #define LOG_TAG "9patch"
20 #define LOG_NDEBUG 1
21
22 #include <androidfw/ResourceTypes.h>
23 #include <hwui/Canvas.h>
24 #include <hwui/Paint.h>
25 #include <utils/Log.h>
26
27 #include "SkCanvas.h"
28 #include "SkLatticeIter.h"
29 #include "SkRegion.h"
30 #include "GraphicsJNI.h"
31 #include "NinePatchPeeker.h"
32 #include "NinePatchUtils.h"
33
34 jclass gInsetStruct_class;
35 jmethodID gInsetStruct_constructorMethodID;
36
37 using namespace android;
38
39 /**
40 * IMPORTANT NOTE: 9patch chunks can be manipuated either as an array of bytes
41 * or as a Res_png_9patch instance. It is important to note that the size of the
42 * array required to hold a 9patch chunk is greater than sizeof(Res_png_9patch).
43 * The code below manipulates chunks as Res_png_9patch* types to draw and as
44 * int8_t* to allocate and free the backing storage.
45 */
46
47 class SkNinePatchGlue {
48 public:
isNinePatchChunk(JNIEnv * env,jobject,jbyteArray obj)49 static jboolean isNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) {
50 if (NULL == obj) {
51 return JNI_FALSE;
52 }
53 if (env->GetArrayLength(obj) < (int)sizeof(Res_png_9patch)) {
54 return JNI_FALSE;
55 }
56 const jbyte* array = env->GetByteArrayElements(obj, 0);
57 if (array != NULL) {
58 const Res_png_9patch* chunk = reinterpret_cast<const Res_png_9patch*>(array);
59 int8_t wasDeserialized = chunk->wasDeserialized;
60 env->ReleaseByteArrayElements(obj, const_cast<jbyte*>(array), JNI_ABORT);
61 return (wasDeserialized != -1) ? JNI_TRUE : JNI_FALSE;
62 }
63 return JNI_FALSE;
64 }
65
validateNinePatchChunk(JNIEnv * env,jobject,jbyteArray obj)66 static jlong validateNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) {
67 size_t chunkSize = env->GetArrayLength(obj);
68 if (chunkSize < (int) (sizeof(Res_png_9patch))) {
69 jniThrowRuntimeException(env, "Array too small for chunk.");
70 return NULL;
71 }
72
73 int8_t* storage = new int8_t[chunkSize];
74 // This call copies the content of the jbyteArray
75 env->GetByteArrayRegion(obj, 0, chunkSize, reinterpret_cast<jbyte*>(storage));
76 // Deserialize in place, return the array we just allocated
77 return reinterpret_cast<jlong>(Res_png_9patch::deserialize(storage));
78 }
79
finalize(JNIEnv * env,jobject,jlong patchHandle)80 static void finalize(JNIEnv* env, jobject, jlong patchHandle) {
81 int8_t* patch = reinterpret_cast<int8_t*>(patchHandle);
82 delete[] patch;
83 }
84
getTransparentRegion(JNIEnv * env,jobject,jlong bitmapPtr,jlong chunkHandle,jobject dstRect)85 static jlong getTransparentRegion(JNIEnv* env, jobject, jlong bitmapPtr,
86 jlong chunkHandle, jobject dstRect) {
87 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle);
88 SkASSERT(chunk);
89
90 SkBitmap bitmap;
91 bitmap::toBitmap(bitmapPtr).getSkBitmap(&bitmap);
92 SkRect dst;
93 GraphicsJNI::jrect_to_rect(env, dstRect, &dst);
94
95 SkCanvas::Lattice lattice;
96 SkIRect src = SkIRect::MakeWH(bitmap.width(), bitmap.height());
97 lattice.fBounds = &src;
98 NinePatchUtils::SetLatticeDivs(&lattice, *chunk, bitmap.width(), bitmap.height());
99 lattice.fRectTypes = nullptr;
100 lattice.fColors = nullptr;
101
102 SkRegion* region = nullptr;
103 if (SkLatticeIter::Valid(bitmap.width(), bitmap.height(), lattice)) {
104 SkLatticeIter iter(lattice, dst);
105 if (iter.numRectsToDraw() == chunk->numColors) {
106 SkRect dummy;
107 SkRect iterDst;
108 int index = 0;
109 while (iter.next(&dummy, &iterDst)) {
110 if (0 == chunk->getColors()[index++] && !iterDst.isEmpty()) {
111 if (!region) {
112 region = new SkRegion();
113 }
114
115 region->op(iterDst.round(), SkRegion::kUnion_Op);
116 }
117 }
118 }
119 }
120
121 return reinterpret_cast<jlong>(region);
122 }
123
124 };
125
createNinePatchInsets(JNIEnv * env,float scale) const126 jobject NinePatchPeeker::createNinePatchInsets(JNIEnv* env, float scale) const {
127 if (!mHasInsets) {
128 return nullptr;
129 }
130
131 return env->NewObject(gInsetStruct_class, gInsetStruct_constructorMethodID,
132 mOpticalInsets[0], mOpticalInsets[1],
133 mOpticalInsets[2], mOpticalInsets[3],
134 mOutlineInsets[0], mOutlineInsets[1],
135 mOutlineInsets[2], mOutlineInsets[3],
136 mOutlineRadius, mOutlineAlpha, scale);
137 }
138
getPadding(JNIEnv * env,jobject outPadding) const139 void NinePatchPeeker::getPadding(JNIEnv* env, jobject outPadding) const {
140 if (mPatch) {
141 GraphicsJNI::set_jrect(env, outPadding,
142 mPatch->paddingLeft, mPatch->paddingTop,
143 mPatch->paddingRight, mPatch->paddingBottom);
144
145 } else {
146 GraphicsJNI::set_jrect(env, outPadding, -1, -1, -1, -1);
147 }
148 }
149
150 /////////////////////////////////////////////////////////////////////////////////////////
151
152 static const JNINativeMethod gNinePatchMethods[] = {
153 { "isNinePatchChunk", "([B)Z", (void*) SkNinePatchGlue::isNinePatchChunk },
154 { "validateNinePatchChunk", "([B)J",
155 (void*) SkNinePatchGlue::validateNinePatchChunk },
156 { "nativeFinalize", "(J)V", (void*) SkNinePatchGlue::finalize },
157 { "nativeGetTransparentRegion", "(JJLandroid/graphics/Rect;)J",
158 (void*) SkNinePatchGlue::getTransparentRegion }
159 };
160
register_android_graphics_NinePatch(JNIEnv * env)161 int register_android_graphics_NinePatch(JNIEnv* env) {
162 gInsetStruct_class = MakeGlobalRefOrDie(env, FindClassOrDie(env,
163 "android/graphics/NinePatch$InsetStruct"));
164 gInsetStruct_constructorMethodID = GetMethodIDOrDie(env, gInsetStruct_class, "<init>",
165 "(IIIIIIIIFIF)V");
166 return android::RegisterMethodsOrDie(env,
167 "android/graphics/NinePatch", gNinePatchMethods, NELEM(gNinePatchMethods));
168 }
169