NinePatch.cpp revision 7d13d9db1ef90063cb542ccd6554042a6a3263b7
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#include "core_jni_helpers.h" 34 35extern void NinePatch_Draw(SkCanvas* canvas, const SkRect& bounds, const SkBitmap& bitmap, 36 const android::Res_png_9patch& chunk, const SkPaint* paint, SkRegion** outRegion); 37 38using namespace android; 39 40/** 41 * IMPORTANT NOTE: 9patch chunks can be manipuated either as an array of bytes 42 * or as a Res_png_9patch instance. It is important to note that the size of the 43 * array required to hold a 9patch chunk is greater than sizeof(Res_png_9patch). 44 * The code below manipulates chunks as Res_png_9patch* types to draw and as 45 * int8_t* to allocate and free the backing storage. 46 */ 47 48class SkNinePatchGlue { 49public: 50 static jboolean isNinePatchChunk(JNIEnv* env, jobject, jbyteArray obj) { 51 if (NULL == obj) { 52 return JNI_FALSE; 53 } 54 if (env->GetArrayLength(obj) < (int)sizeof(Res_png_9patch)) { 55 return JNI_FALSE; 56 } 57 const jbyte* array = env->GetByteArrayElements(obj, 0); 58 if (array != NULL) { 59 const Res_png_9patch* chunk = reinterpret_cast<const Res_png_9patch*>(array); 60 int8_t wasDeserialized = chunk->wasDeserialized; 61 env->ReleaseByteArrayElements(obj, const_cast<jbyte*>(array), JNI_ABORT); 62 return (wasDeserialized != -1) ? JNI_TRUE : JNI_FALSE; 63 } 64 return JNI_FALSE; 65 } 66 67 static jlong validateNinePatchChunk(JNIEnv* env, jobject, jlong, jbyteArray obj) { 68 size_t chunkSize = env->GetArrayLength(obj); 69 if (chunkSize < (int) (sizeof(Res_png_9patch))) { 70 jniThrowRuntimeException(env, "Array too small for chunk."); 71 return NULL; 72 } 73 74 int8_t* storage = new int8_t[chunkSize]; 75 // This call copies the content of the jbyteArray 76 env->GetByteArrayRegion(obj, 0, chunkSize, reinterpret_cast<jbyte*>(storage)); 77 // Deserialize in place, return the array we just allocated 78 return reinterpret_cast<jlong>(Res_png_9patch::deserialize(storage)); 79 } 80 81 static void finalize(JNIEnv* env, jobject, jlong patchHandle) { 82 int8_t* patch = reinterpret_cast<int8_t*>(patchHandle); 83#ifdef USE_OPENGL_RENDERER 84 if (android::uirenderer::ResourceCache::hasInstance()) { 85 Res_png_9patch* p = (Res_png_9patch*) patch; 86 android::uirenderer::ResourceCache::getInstance().destructor(p); 87 return; 88 } 89#endif // USE_OPENGL_RENDERER 90 delete[] patch; 91 } 92 93 static void draw(JNIEnv* env, SkCanvas* canvas, SkRect& bounds, const SkBitmap* bitmap, 94 Res_png_9patch* chunk, const SkPaint* paint, jint destDensity, jint srcDensity) { 95 if (destDensity == srcDensity || destDensity == 0 || srcDensity == 0) { 96 ALOGV("Drawing unscaled 9-patch: (%g,%g)-(%g,%g)", 97 SkScalarToFloat(bounds.fLeft), SkScalarToFloat(bounds.fTop), 98 SkScalarToFloat(bounds.fRight), SkScalarToFloat(bounds.fBottom)); 99 NinePatch_Draw(canvas, bounds, *bitmap, *chunk, paint, NULL); 100 } else { 101 canvas->save(); 102 103 SkScalar scale = destDensity / (float)srcDensity; 104 canvas->translate(bounds.fLeft, bounds.fTop); 105 canvas->scale(scale, scale); 106 107 bounds.fRight = SkScalarDiv(bounds.fRight-bounds.fLeft, scale); 108 bounds.fBottom = SkScalarDiv(bounds.fBottom-bounds.fTop, scale); 109 bounds.fLeft = bounds.fTop = 0; 110 111 ALOGV("Drawing scaled 9-patch: (%g,%g)-(%g,%g) srcDensity=%d destDensity=%d", 112 SkScalarToFloat(bounds.fLeft), SkScalarToFloat(bounds.fTop), 113 SkScalarToFloat(bounds.fRight), SkScalarToFloat(bounds.fBottom), 114 srcDensity, destDensity); 115 116 NinePatch_Draw(canvas, bounds, *bitmap, *chunk, paint, NULL); 117 118 canvas->restore(); 119 } 120 } 121 122 static void drawF(JNIEnv* env, jobject, jlong canvasHandle, jobject boundsRectF, 123 jlong bitmapHandle, jlong chunkHandle, jlong paintHandle, 124 jint destDensity, jint srcDensity) { 125 SkCanvas* canvas = reinterpret_cast<Canvas*>(canvasHandle)->getSkCanvas(); 126 const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle); 127 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle); 128 const Paint* paint = reinterpret_cast<Paint*>(paintHandle); 129 SkASSERT(canvas); 130 SkASSERT(boundsRectF); 131 SkASSERT(bitmap); 132 SkASSERT(chunk); 133 // paint is optional 134 135 SkRect bounds; 136 GraphicsJNI::jrectf_to_rect(env, boundsRectF, &bounds); 137 138 draw(env, canvas, bounds, bitmap, chunk, paint, destDensity, srcDensity); 139 } 140 141 static void drawI(JNIEnv* env, jobject, jlong canvasHandle, jobject boundsRect, 142 jlong bitmapHandle, jlong chunkHandle, jlong paintHandle, 143 jint destDensity, jint srcDensity) { 144 SkCanvas* canvas = reinterpret_cast<Canvas*>(canvasHandle)->getSkCanvas(); 145 const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle); 146 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle); 147 const Paint* paint = reinterpret_cast<Paint*>(paintHandle); 148 SkASSERT(canvas); 149 SkASSERT(boundsRect); 150 SkASSERT(bitmap); 151 SkASSERT(chunk); 152 // paint is optional 153 154 SkRect bounds; 155 GraphicsJNI::jrect_to_rect(env, boundsRect, &bounds); 156 draw(env, canvas, bounds, bitmap, chunk, paint, destDensity, srcDensity); 157 } 158 159 static jlong getTransparentRegion(JNIEnv* env, jobject, jlong bitmapHandle, 160 jlong chunkHandle, jobject boundsRect) { 161 const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle); 162 Res_png_9patch* chunk = reinterpret_cast<Res_png_9patch*>(chunkHandle); 163 SkASSERT(bitmap); 164 SkASSERT(chunk); 165 SkASSERT(boundsRect); 166 167 SkRect bounds; 168 GraphicsJNI::jrect_to_rect(env, boundsRect, &bounds); 169 170 SkRegion* region = NULL; 171 NinePatch_Draw(NULL, bounds, *bitmap, *chunk, NULL, ®ion); 172 173 return reinterpret_cast<jlong>(region); 174 } 175 176}; 177 178///////////////////////////////////////////////////////////////////////////////////////// 179 180static JNINativeMethod gNinePatchMethods[] = { 181 { "isNinePatchChunk", "([B)Z", (void*) SkNinePatchGlue::isNinePatchChunk }, 182 { "validateNinePatchChunk", "(J[B)J", (void*) SkNinePatchGlue::validateNinePatchChunk }, 183 { "nativeFinalize", "(J)V", (void*) SkNinePatchGlue::finalize }, 184 { "nativeDraw", "(JLandroid/graphics/RectF;JJJII)V", (void*) SkNinePatchGlue::drawF }, 185 { "nativeDraw", "(JLandroid/graphics/Rect;JJJII)V", (void*) SkNinePatchGlue::drawI }, 186 { "nativeGetTransparentRegion", "(JJLandroid/graphics/Rect;)J", 187 (void*) SkNinePatchGlue::getTransparentRegion } 188}; 189 190int register_android_graphics_NinePatch(JNIEnv* env) { 191 return android::RegisterMethodsOrDie(env, 192 "android/graphics/NinePatch", gNinePatchMethods, NELEM(gNinePatchMethods)); 193} 194