diff options
Diffstat (limited to 'services/jni/com_android_server_AssetAtlasService.cpp')
| -rw-r--r-- | services/jni/com_android_server_AssetAtlasService.cpp | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/services/jni/com_android_server_AssetAtlasService.cpp b/services/jni/com_android_server_AssetAtlasService.cpp new file mode 100644 index 0000000..62e950f --- /dev/null +++ b/services/jni/com_android_server_AssetAtlasService.cpp @@ -0,0 +1,271 @@ +/* + * Copyright (C) 2013 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define LOG_TAG "AssetAtlasService" + +#include "jni.h" +#include "JNIHelp.h" + +#include <android_view_GraphicBuffer.h> + +#include <GLES2/gl2.h> +#include <GLES2/gl2ext.h> + +#include <EGL/egl.h> +#include <EGL/eglext.h> + +#include <SkCanvas.h> +#include <SkBitmap.h> + +namespace android { + +// ---------------------------------------------------------------------------- +// Defines +// ---------------------------------------------------------------------------- + +// Defines how long to wait for the GPU when uploading the atlas +// This timeout is defined in nanoseconds (see EGL_KHR_fence_sync extension) +#define FENCE_TIMEOUT 2000000000 + +// ---------------------------------------------------------------------------- +// JNI Helpers +// ---------------------------------------------------------------------------- + +static struct { + jfieldID mFinalizer; + jfieldID mNativeCanvas; +} gCanvasClassInfo; + +static struct { + jfieldID mNativeCanvas; +} gCanvasFinalizerClassInfo; + +#define GET_INT(object, field) \ + env->GetIntField(object, field) + +#define SET_INT(object, field, value) \ + env->SetIntField(object, field, value) + +// ---------------------------------------------------------------------------- +// Canvas management +// ---------------------------------------------------------------------------- + +static inline void swapCanvasPtr(JNIEnv* env, jobject canvasObj, SkCanvas* newCanvas) { + jobject canvasFinalizerObj = env->GetObjectField(canvasObj, gCanvasClassInfo.mFinalizer); + SkCanvas* previousCanvas = reinterpret_cast<SkCanvas*>( + GET_INT(canvasObj, gCanvasClassInfo.mNativeCanvas)); + SET_INT(canvasObj, gCanvasClassInfo.mNativeCanvas, (int) newCanvas); + SET_INT(canvasFinalizerObj, gCanvasFinalizerClassInfo.mNativeCanvas, (int) newCanvas); + SkSafeUnref(previousCanvas); +} + +static SkBitmap* com_android_server_AssetAtlasService_acquireCanvas(JNIEnv* env, jobject, + jobject canvas, jint width, jint height) { + + SkBitmap* bitmap = new SkBitmap; + bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height); + bitmap->allocPixels(); + bitmap->eraseColor(0); + + SkCanvas* nativeCanvas = SkNEW_ARGS(SkCanvas, (*bitmap)); + swapCanvasPtr(env, canvas, nativeCanvas); + + return bitmap; +} + +static void com_android_server_AssetAtlasService_releaseCanvas(JNIEnv* env, jobject, + jobject canvas, SkBitmap* bitmap) { + + SkCanvas* nativeCanvas = SkNEW(SkCanvas); + swapCanvasPtr(env, canvas, nativeCanvas); + + delete bitmap; +} + +#define CLEANUP_GL_AND_RETURN(result) \ + if (fence != EGL_NO_SYNC_KHR) eglDestroySyncKHR(display, fence); \ + if (image) eglDestroyImageKHR(display, image); \ + if (texture) glDeleteTextures(1, &texture); \ + if (surface != EGL_NO_SURFACE) eglDestroySurface(display, surface); \ + if (context != EGL_NO_CONTEXT) eglDestroyContext(display, context); \ + eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); \ + eglReleaseThread(); \ + eglTerminate(display); \ + return result; + +static jboolean com_android_server_AssetAtlasService_upload(JNIEnv* env, jobject, + jobject graphicBuffer, SkBitmap* bitmap) { + + // The goal of this method is to copy the bitmap into the GraphicBuffer + // using the GPU to swizzle the texture content + sp<GraphicBuffer> buffer(graphicBufferForJavaObject(env, graphicBuffer)); + + if (buffer != NULL) { + EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY); + if (display == EGL_NO_DISPLAY) return false; + + EGLint major; + EGLint minor; + if (!eglInitialize(display, &major, &minor)) { + ALOGW("Could not initialize EGL"); + return false; + } + + // We're going to use a 1x1 pbuffer surface later on + // The configuration doesn't really matter for what we're trying to do + EGLint configAttrs[] = { + EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, + EGL_RED_SIZE, 8, + EGL_GREEN_SIZE, 8, + EGL_BLUE_SIZE, 8, + EGL_ALPHA_SIZE, 0, + EGL_DEPTH_SIZE, 0, + EGL_STENCIL_SIZE, 0, + EGL_NONE + }; + EGLConfig configs[1]; + EGLint configCount; + if (!eglChooseConfig(display, configAttrs, configs, 1, &configCount)) { + ALOGW("Could not select EGL configuration"); + eglReleaseThread(); + eglTerminate(display); + return false; + } + if (configCount <= 0) { + ALOGW("Could not find EGL configuration"); + eglReleaseThread(); + eglTerminate(display); + return false; + } + + // These objects are initialized below but the default "null" + // values are used to cleanup properly at any point in the + // initialization sequence + GLuint texture = 0; + EGLImageKHR image = EGL_NO_IMAGE_KHR; + EGLSurface surface = EGL_NO_SURFACE; + EGLSyncKHR fence = EGL_NO_SYNC_KHR; + + EGLint attrs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE }; + EGLContext context = eglCreateContext(display, configs[0], EGL_NO_CONTEXT, attrs); + if (context == EGL_NO_CONTEXT) { + ALOGW("Could not create EGL context"); + CLEANUP_GL_AND_RETURN(false); + } + + // Create the 1x1 pbuffer + EGLint surfaceAttrs[] = { EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE }; + surface = eglCreatePbufferSurface(display, configs[0], surfaceAttrs); + if (surface == EGL_NO_SURFACE) { + ALOGW("Could not create EGL surface"); + CLEANUP_GL_AND_RETURN(false); + } + + if (!eglMakeCurrent(display, surface, surface, context)) { + ALOGW("Could not change current EGL context"); + CLEANUP_GL_AND_RETURN(false); + } + + // We use an EGLImage to access the content of the GraphicBuffer + // The EGL image is later bound to a 2D texture + EGLClientBuffer clientBuffer = (EGLClientBuffer) buffer->getNativeBuffer(); + EGLint imageAttrs[] = { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE }; + image = eglCreateImageKHR(display, EGL_NO_CONTEXT, + EGL_NATIVE_BUFFER_ANDROID, clientBuffer, imageAttrs); + if (image == EGL_NO_IMAGE_KHR) { + ALOGW("Could not create EGL image"); + CLEANUP_GL_AND_RETURN(false); + } + + glGenTextures(1, &texture); + glBindTexture(GL_TEXTURE_2D, texture); + glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image); + if (glGetError() != GL_NO_ERROR) { + ALOGW("Could not create/bind texture"); + CLEANUP_GL_AND_RETURN(false); + } + + // Upload the content of the bitmap in the GraphicBuffer + glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel()); + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, bitmap->width(), bitmap->height(), + GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels()); + if (glGetError() != GL_NO_ERROR) { + ALOGW("Could not upload to texture"); + CLEANUP_GL_AND_RETURN(false); + } + + // The fence is used to wait for the texture upload to finish + // properly. We cannot rely on glFlush() and glFinish() as + // some drivers completely ignore these API calls + fence = eglCreateSyncKHR(display, EGL_SYNC_FENCE_KHR, NULL); + if (fence == EGL_NO_SYNC_KHR) { + ALOGW("Could not create sync fence %#x", eglGetError()); + CLEANUP_GL_AND_RETURN(false); + } + + // The flag EGL_SYNC_FLUSH_COMMANDS_BIT_KHR will trigger a + // pipeline flush (similar to what a glFlush() would do.) + EGLint waitStatus = eglClientWaitSyncKHR(display, fence, + EGL_SYNC_FLUSH_COMMANDS_BIT_KHR, FENCE_TIMEOUT); + if (waitStatus != EGL_CONDITION_SATISFIED_KHR) { + ALOGW("Failed to wait for the fence %#x", eglGetError()); + CLEANUP_GL_AND_RETURN(false); + } + + CLEANUP_GL_AND_RETURN(true); + } + + return false; +} + +// ---------------------------------------------------------------------------- +// JNI Glue +// ---------------------------------------------------------------------------- + +#define FIND_CLASS(var, className) \ + var = env->FindClass(className); \ + LOG_FATAL_IF(! var, "Unable to find class " className); + +#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \ + var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \ + LOG_FATAL_IF(! var, "Unable to find field " fieldName); + +const char* const kClassPathName = "com/android/server/AssetAtlasService"; + +static JNINativeMethod gMethods[] = { + { "nAcquireAtlasCanvas", "(Landroid/graphics/Canvas;II)I", + (void*) com_android_server_AssetAtlasService_acquireCanvas }, + { "nReleaseAtlasCanvas", "(Landroid/graphics/Canvas;I)V", + (void*) com_android_server_AssetAtlasService_releaseCanvas }, + { "nUploadAtlas", "(Landroid/view/GraphicBuffer;I)Z", + (void*) com_android_server_AssetAtlasService_upload }, +}; + +int register_android_server_AssetAtlasService(JNIEnv* env) { + jclass clazz; + + FIND_CLASS(clazz, "android/graphics/Canvas"); + GET_FIELD_ID(gCanvasClassInfo.mFinalizer, clazz, "mFinalizer", + "Landroid/graphics/Canvas$CanvasFinalizer;"); + GET_FIELD_ID(gCanvasClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I"); + + FIND_CLASS(clazz, "android/graphics/Canvas$CanvasFinalizer"); + GET_FIELD_ID(gCanvasFinalizerClassInfo.mNativeCanvas, clazz, "mNativeCanvas", "I"); + + return jniRegisterNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods)); +} + +}; |