core/jni/android_view_TextureView.cpp

   1 /*
   2  * Copyright (C) 2011 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include "jni.h"
  18 #include <nativehelper/JNIHelp.h>
  19 #include <android_runtime/AndroidRuntime.h>
  20 #include <android_runtime/android_graphics_SurfaceTexture.h>
  21
  22 #include <ui/Region.h>
  23 #include <ui/Rect.h>
  24
  25 #include <gui/GLConsumer.h>
  26 #include <gui/Surface.h>
  27
  28 #include <SkBitmap.h>
  29 #include <SkCanvas.h>
  30 #include <SkImage.h>
  31
  32 #include "android/graphics/GraphicsJNI.h"
  33
  34 #include "core_jni_helpers.h"
  35
  36 namespace android {
  37
  38 // ----------------------------------------------------------------------------
  39 // JNI Glue
  40 // ----------------------------------------------------------------------------
  41
  42 static struct {
  43     jmethodID set;
  44     jfieldID left;
  45     jfieldID top;
  46     jfieldID right;
  47     jfieldID bottom;
  48 } gRectClassInfo;
  49
  50 static struct {
  51     jfieldID nativeWindow;
  52 } gTextureViewClassInfo;
  53
  54 #define GET_INT(object, field) \
  55     env->GetIntField(object, field)
  56
  57 #define GET_LONG(object, field) \
  58     env->GetLongField(object, field)
  59
  60 #define SET_INT(object, field, value) \
  61     env->SetIntField(object, field, value)
  62
  63 #define SET_LONG(object, field, value) \
  64     env->SetLongField(object, field, value)
  65
  66 #define INVOKEV(object, method, ...) \
  67     env->CallVoidMethod(object, method, __VA_ARGS__)
  68
  69 // ----------------------------------------------------------------------------
  70 // Native layer
  71 // ----------------------------------------------------------------------------
  72
  73 // FIXME: consider exporting this to share (e.g. android_view_Surface.cpp)
  74 static inline SkImageInfo convertPixelFormat(const ANativeWindow_Buffer& buffer) {
  75     SkColorType ct = kUnknown_SkColorType;
  76     SkAlphaType at = kOpaque_SkAlphaType;
  77     switch (buffer.format) {
  78         case WINDOW_FORMAT_RGBA_8888:
  79             ct = kN32_SkColorType;
  80             at = kPremul_SkAlphaType;
  81             break;
  82         case WINDOW_FORMAT_RGBX_8888:
  83             ct = kN32_SkColorType;
  84             at = kOpaque_SkAlphaType;
  85             break;
  86         case WINDOW_FORMAT_RGB_565:
  87             ct = kRGB_565_SkColorType;
  88             at = kOpaque_SkAlphaType;
  89             break;
  90         default:
  91             break;
  92     }
  93     return SkImageInfo::Make(buffer.width, buffer.height, ct, at);
  94 }
  95
  96 /**
  97  * This is a private API, and this implementation is also provided in the NDK.
  98  * However, the NDK links against android_runtime, which means that using the
  99  * NDK implementation would create a circular dependency between the libraries.
 100  */
 101 static int32_t native_window_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
 102         Rect* inOutDirtyBounds) {
 103     return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
 104 }
 105
 106 static int32_t native_window_unlockAndPost(ANativeWindow* window) {
 107     return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
 108 }
 109
 110 static void android_view_TextureView_createNativeWindow(JNIEnv* env, jobject textureView,
 111         jobject surface) {
 112
 113     sp<IGraphicBufferProducer> producer(SurfaceTexture_getProducer(env, surface));
 114     sp<ANativeWindow> window = new Surface(producer, true);
 115
 116     window->incStrong((void*)android_view_TextureView_createNativeWindow);
 117     SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, jlong(window.get()));
 118 }
 119
 120 static void android_view_TextureView_destroyNativeWindow(JNIEnv* env, jobject textureView) {
 121
 122     ANativeWindow* nativeWindow = (ANativeWindow*)
 123             GET_LONG(textureView, gTextureViewClassInfo.nativeWindow);
 124
 125     if (nativeWindow) {
 126         sp<ANativeWindow> window(nativeWindow);
 127             window->decStrong((void*)android_view_TextureView_createNativeWindow);
 128         SET_LONG(textureView, gTextureViewClassInfo.nativeWindow, 0);
 129     }
 130 }
 131
 132 static jboolean android_view_TextureView_lockCanvas(JNIEnv* env, jobject,
 133         jlong nativeWindow, jobject canvas, jobject dirtyRect) {
 134
 135     if (!nativeWindow) {
 136         return JNI_FALSE;
 137     }
 138
 139     ANativeWindow_Buffer buffer;
 140
 141     Rect rect(Rect::EMPTY_RECT);
 142     if (dirtyRect) {
 143         rect.left = GET_INT(dirtyRect, gRectClassInfo.left);
 144         rect.top = GET_INT(dirtyRect, gRectClassInfo.top);
 145         rect.right = GET_INT(dirtyRect, gRectClassInfo.right);
 146         rect.bottom = GET_INT(dirtyRect, gRectClassInfo.bottom);
 147     } else {
 148         rect.set(Rect(0x3FFF, 0x3FFF));
 149     }
 150
 151     sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
 152     int32_t status = native_window_lock(window.get(), &buffer, &rect);
 153     if (status) return JNI_FALSE;
 154
 155     ssize_t bytesCount = buffer.stride * bytesPerPixel(buffer.format);
 156
 157     SkBitmap bitmap;
 158     bitmap.setInfo(convertPixelFormat(buffer), bytesCount);
 159
 160     if (buffer.width > 0 && buffer.height > 0) {
 161         bitmap.setPixels(buffer.bits);
 162     } else {
 163         bitmap.setPixels(NULL);
 164     }
 165
 166     Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
 167     nativeCanvas->setBitmap(bitmap);
 168     nativeCanvas->clipRect(rect.left, rect.top, rect.right, rect.bottom);
 169
 170     if (dirtyRect) {
 171         INVOKEV(dirtyRect, gRectClassInfo.set,
 172                 int(rect.left), int(rect.top), int(rect.right), int(rect.bottom));
 173     }
 174
 175     return JNI_TRUE;
 176 }
 177
 178 static void android_view_TextureView_unlockCanvasAndPost(JNIEnv* env, jobject,
 179         jlong nativeWindow, jobject canvas) {
 180
 181     Canvas* nativeCanvas = GraphicsJNI::getNativeCanvas(env, canvas);
 182     nativeCanvas->setBitmap(SkBitmap());
 183
 184     if (nativeWindow) {
 185         sp<ANativeWindow> window((ANativeWindow*) nativeWindow);
 186         native_window_unlockAndPost(window.get());
 187     }
 188 }
 189
 190 // ----------------------------------------------------------------------------
 191 // JNI Glue
 192 // ----------------------------------------------------------------------------
 193
 194 const char* const kClassPathName = "android/view/TextureView";
 195
 196 static const JNINativeMethod gMethods[] = {
 197     {   "nCreateNativeWindow", "(Landroid/graphics/SurfaceTexture;)V",
 198             (void*) android_view_TextureView_createNativeWindow },
 199     {   "nDestroyNativeWindow", "()V",
 200             (void*) android_view_TextureView_destroyNativeWindow },
 201
 202     {   "nLockCanvas", "(JLandroid/graphics/Canvas;Landroid/graphics/Rect;)Z",
 203             (void*) android_view_TextureView_lockCanvas },
 204     {   "nUnlockCanvasAndPost", "(JLandroid/graphics/Canvas;)V",
 205             (void*) android_view_TextureView_unlockCanvasAndPost },
 206 };
 207
 208 int register_android_view_TextureView(JNIEnv* env) {
 209     jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
 210     gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
 211     gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
 212     gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
 213     gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
 214     gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
 215
 216     clazz = FindClassOrDie(env, "android/view/TextureView");
 217     gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
 218
 219     return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
 220 }
 221
 222 };