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 "SkRegion.h"
30 #include "GraphicsJNI.h"
31
32 #include "utils/NinePatch.h"
33
34 #include "JNIHelp.h"
35 #include "core_jni_helpers.h"
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 if (android::uirenderer::ResourceCache::hasInstance()) {
83 Res_png_9patch* p = (Res_png_9patch*) patch;
84 android::uirenderer::ResourceCache::getInstance().destructor(p);
85 } else {
86 delete[] patch;
87 }
88 }
89
getTransparentRegion(JNIEnv * env,jobject,jobject jbitmap,jlong chunkHandle,jobject boundsRect)90 static jlong getTransparentRegion(JNIEnv* env, jobject, jobject jbitmap,
91 jlong chunkHandle, jobject boundsRect) {
92 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle);
93 SkASSERT(chunk);
94 SkASSERT(boundsRect);
95
96 SkBitmap bitmap;
97 GraphicsJNI::getSkBitmap(env, jbitmap, &bitmap);
98 SkRect bounds;
99 GraphicsJNI::jrect_to_rect(env, boundsRect, &bounds);
100
101 SkRegion* region = NULL;
102 NinePatch::Draw(NULL, bounds, bitmap, *chunk, NULL, ®ion);
103
104 return reinterpret_cast<jlong>(region);
105 }
106
107 };
108
109 /////////////////////////////////////////////////////////////////////////////////////////
110
111 static const JNINativeMethod gNinePatchMethods[] = {
112 { "isNinePatchChunk", "([B)Z", (void*) SkNinePatchGlue::isNinePatchChunk },
113 { "validateNinePatchChunk", "([B)J",
114 (void*) SkNinePatchGlue::validateNinePatchChunk },
115 { "nativeFinalize", "(J)V", (void*) SkNinePatchGlue::finalize },
116 { "nativeGetTransparentRegion", "(Landroid/graphics/Bitmap;JLandroid/graphics/Rect;)J",
117 (void*) SkNinePatchGlue::getTransparentRegion }
118 };
119
register_android_graphics_NinePatch(JNIEnv * env)120 int register_android_graphics_NinePatch(JNIEnv* env) {
121 return android::RegisterMethodsOrDie(env,
122 "android/graphics/NinePatch", gNinePatchMethods, NELEM(gNinePatchMethods));
123 }
124