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 <utils/Log.h>
23
24 #include <ResourceCache.h>
25
26 #include "Paint.h"
27 #include "Canvas.h"
28 #include "SkCanvas.h"
29 #include "SkRegion.h"
30 #include "GraphicsJNI.h"
31
32 #include "JNIHelp.h"
33
34 extern void NinePatch_Draw(SkCanvas* canvas, const SkRect& bounds, const SkBitmap& bitmap,
35 const android::Res_png_9patch& chunk, const SkPaint* paint, SkRegion** outRegion);
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,jlong,jbyteArray obj)66 static jlong validateNinePatchChunk(JNIEnv* env, jobject, jlong, 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 #ifdef USE_OPENGL_RENDERER
83 if (android::uirenderer::ResourceCache::hasInstance()) {
84 Res_png_9patch* p = (Res_png_9patch*) patch;
85 android::uirenderer::ResourceCache::getInstance().destructor(p);
86 return;
87 }
88 #endif // USE_OPENGL_RENDERER
89 delete[] patch;
90 }
91
draw(JNIEnv * env,SkCanvas * canvas,SkRect & bounds,const SkBitmap * bitmap,Res_png_9patch * chunk,const SkPaint * paint,jint destDensity,jint srcDensity)92 static void draw(JNIEnv* env, SkCanvas* canvas, SkRect& bounds, const SkBitmap* bitmap,
93 Res_png_9patch* chunk, const SkPaint* paint, jint destDensity, jint srcDensity) {
94 if (destDensity == srcDensity || destDensity == 0 || srcDensity == 0) {
95 ALOGV("Drawing unscaled 9-patch: (%g,%g)-(%g,%g)",
96 SkScalarToFloat(bounds.fLeft), SkScalarToFloat(bounds.fTop),
97 SkScalarToFloat(bounds.fRight), SkScalarToFloat(bounds.fBottom));
98 NinePatch_Draw(canvas, bounds, *bitmap, *chunk, paint, NULL);
99 } else {
100 canvas->save();
101
102 SkScalar scale = destDensity / (float)srcDensity;
103 canvas->translate(bounds.fLeft, bounds.fTop);
104 canvas->scale(scale, scale);
105
106 bounds.fRight = SkScalarDiv(bounds.fRight-bounds.fLeft, scale);
107 bounds.fBottom = SkScalarDiv(bounds.fBottom-bounds.fTop, scale);
108 bounds.fLeft = bounds.fTop = 0;
109
110 ALOGV("Drawing scaled 9-patch: (%g,%g)-(%g,%g) srcDensity=%d destDensity=%d",
111 SkScalarToFloat(bounds.fLeft), SkScalarToFloat(bounds.fTop),
112 SkScalarToFloat(bounds.fRight), SkScalarToFloat(bounds.fBottom),
113 srcDensity, destDensity);
114
115 NinePatch_Draw(canvas, bounds, *bitmap, *chunk, paint, NULL);
116
117 canvas->restore();
118 }
119 }
120
drawF(JNIEnv * env,jobject,jlong canvasHandle,jobject boundsRectF,jlong bitmapHandle,jlong chunkHandle,jlong paintHandle,jint destDensity,jint srcDensity)121 static void drawF(JNIEnv* env, jobject, jlong canvasHandle, jobject boundsRectF,
122 jlong bitmapHandle, jlong chunkHandle, jlong paintHandle,
123 jint destDensity, jint srcDensity) {
124 SkCanvas* canvas = reinterpret_cast<Canvas*>(canvasHandle)->getSkCanvas();
125 const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
126 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle);
127 const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
128 SkASSERT(canvas);
129 SkASSERT(boundsRectF);
130 SkASSERT(bitmap);
131 SkASSERT(chunk);
132 // paint is optional
133
134 SkRect bounds;
135 GraphicsJNI::jrectf_to_rect(env, boundsRectF, &bounds);
136
137 draw(env, canvas, bounds, bitmap, chunk, paint, destDensity, srcDensity);
138 }
139
drawI(JNIEnv * env,jobject,jlong canvasHandle,jobject boundsRect,jlong bitmapHandle,jlong chunkHandle,jlong paintHandle,jint destDensity,jint srcDensity)140 static void drawI(JNIEnv* env, jobject, jlong canvasHandle, jobject boundsRect,
141 jlong bitmapHandle, jlong chunkHandle, jlong paintHandle,
142 jint destDensity, jint srcDensity) {
143 SkCanvas* canvas = reinterpret_cast<Canvas*>(canvasHandle)->getSkCanvas();
144 const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
145 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle);
146 const Paint* paint = reinterpret_cast<Paint*>(paintHandle);
147 SkASSERT(canvas);
148 SkASSERT(boundsRect);
149 SkASSERT(bitmap);
150 SkASSERT(chunk);
151 // paint is optional
152
153 SkRect bounds;
154 GraphicsJNI::jrect_to_rect(env, boundsRect, &bounds);
155 draw(env, canvas, bounds, bitmap, chunk, paint, destDensity, srcDensity);
156 }
157
getTransparentRegion(JNIEnv * env,jobject,jlong bitmapHandle,jlong chunkHandle,jobject boundsRect)158 static jlong getTransparentRegion(JNIEnv* env, jobject, jlong bitmapHandle,
159 jlong chunkHandle, jobject boundsRect) {
160 const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
161 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle);
162 SkASSERT(bitmap);
163 SkASSERT(chunk);
164 SkASSERT(boundsRect);
165
166 SkRect bounds;
167 GraphicsJNI::jrect_to_rect(env, boundsRect, &bounds);
168
169 SkRegion* region = NULL;
170 NinePatch_Draw(NULL, bounds, *bitmap, *chunk, NULL, ®ion);
171
172 return reinterpret_cast<jlong>(region);
173 }
174
175 };
176
177 /////////////////////////////////////////////////////////////////////////////////////////
178
179 #include <android_runtime/AndroidRuntime.h>
180
181 static JNINativeMethod gNinePatchMethods[] = {
182 { "isNinePatchChunk", "([B)Z", (void*) SkNinePatchGlue::isNinePatchChunk },
183 { "validateNinePatchChunk", "(J[B)J", (void*) SkNinePatchGlue::validateNinePatchChunk },
184 { "nativeFinalize", "(J)V", (void*) SkNinePatchGlue::finalize },
185 { "nativeDraw", "(JLandroid/graphics/RectF;JJJII)V", (void*) SkNinePatchGlue::drawF },
186 { "nativeDraw", "(JLandroid/graphics/Rect;JJJII)V", (void*) SkNinePatchGlue::drawI },
187 { "nativeGetTransparentRegion", "(JJLandroid/graphics/Rect;)J",
188 (void*) SkNinePatchGlue::getTransparentRegion }
189 };
190
register_android_graphics_NinePatch(JNIEnv * env)191 int register_android_graphics_NinePatch(JNIEnv* env) {
192 return android::AndroidRuntime::registerNativeMethods(env,
193 "android/graphics/NinePatch", gNinePatchMethods, SK_ARRAY_COUNT(gNinePatchMethods));
194 }
195