NinePatch.cpp revision a35778c799e8073a42b9e22191bde9d838327ab7
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 34extern void NinePatch_Draw(SkCanvas* canvas, const SkRect& bounds, const SkBitmap& bitmap, 35 const android::Res_png_9patch& chunk, const SkPaint* paint, SkRegion** outRegion); 36 37using 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 47class SkNinePatchGlue { 48public: 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 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 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 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 } 120 121 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 } 139 140 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 } 157 158 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 181static 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 191int register_android_graphics_NinePatch(JNIEnv* env) { 192 return android::AndroidRuntime::registerNativeMethods(env, 193 "android/graphics/NinePatch", gNinePatchMethods, SK_ARRAY_COUNT(gNinePatchMethods)); 194} 195