1 files changed, 199 insertions, 0 deletions
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
new file mode 100644
index 0000000000..9579996342
--- /dev/null
+++ b/libs/gui/SurfaceTexture.cpp
@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2010 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 "SurfaceTexture"
+
+#define GL_GLEXT_PROTOTYPES
+#define EGL_EGLEXT_PROTOTYPES
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include <gui/SurfaceTexture.h>
+
+#include <surfaceflinger/ISurfaceComposer.h>
+#include <surfaceflinger/SurfaceComposerClient.h>
+
+#include <utils/Log.h>
+
+namespace android {
+
+SurfaceTexture::SurfaceTexture(GLuint tex) :
+    mBufferCount(MIN_BUFFER_SLOTS), mCurrentTexture(INVALID_BUFFER_SLOT),
+    mLastQueued(INVALID_BUFFER_SLOT), mTexName(tex) {
+}
+
+SurfaceTexture::~SurfaceTexture() {
+    freeAllBuffers();
+}
+
+status_t SurfaceTexture::setBufferCount(int bufferCount) {
+    Mutex::Autolock lock(mMutex);
+    freeAllBuffers();
+    mBufferCount = bufferCount;
+    return OK;
+}
+
+sp<GraphicBuffer> SurfaceTexture::requestBuffer(int buf,
+        uint32_t w, uint32_t h, uint32_t format, uint32_t usage) {
+    Mutex::Autolock lock(mMutex);
+    if (buf < 0 || mBufferCount <= buf) {
+        LOGE("requestBuffer: slot index out of range [0, %d]: %d",
+                mBufferCount, buf);
+        return 0;
+    }
+    usage |= GraphicBuffer::USAGE_HW_TEXTURE;
+    sp<ISurfaceComposer> composer(ComposerService::getComposerService());
+    sp<GraphicBuffer> graphicBuffer(composer->createGraphicBuffer(w, h,
+            format, usage));
+    if (graphicBuffer == 0) {
+        LOGE("requestBuffer: SurfaceComposer::createGraphicBuffer failed");
+    } else {
+        mSlots[buf].mGraphicBuffer = graphicBuffer;
+        if (mSlots[buf].mEglImage != EGL_NO_IMAGE_KHR) {
+            eglDestroyImageKHR(mSlots[buf].mEglDisplay, mSlots[buf].mEglImage);
+            mSlots[buf].mEglImage = EGL_NO_IMAGE_KHR;
+            mSlots[buf].mEglDisplay = EGL_NO_DISPLAY;
+        }
+    }
+    return graphicBuffer;
+}
+
+status_t SurfaceTexture::dequeueBuffer(int *buf) {
+    Mutex::Autolock lock(mMutex);
+    int found = INVALID_BUFFER_SLOT;
+    for (int i = 0; i < mBufferCount; i++) {
+        if (!mSlots[i].mOwnedByClient && i != mCurrentTexture) {
+            mSlots[i].mOwnedByClient = true;
+            found = i;
+            break;
+        }
+    }
+    if (found == INVALID_BUFFER_SLOT) {
+        return -EBUSY;
+    }
+    *buf = found;
+    return OK;
+}
+
+status_t SurfaceTexture::queueBuffer(int buf) {
+    Mutex::Autolock lock(mMutex);
+    if (buf < 0 || mBufferCount <= buf) {
+        LOGE("queueBuffer: slot index out of range [0, %d]: %d",
+                mBufferCount, buf);
+        return -EINVAL;
+    } else if (!mSlots[buf].mOwnedByClient) {
+        LOGE("queueBuffer: slot %d is not owned by the client", buf);
+        return -EINVAL;
+    } else if (mSlots[buf].mGraphicBuffer == 0) {
+        LOGE("queueBuffer: slot %d was enqueued without requesting a buffer",
+                buf);
+        return -EINVAL;
+    }
+    mSlots[buf].mOwnedByClient = false;
+    mLastQueued = buf;
+    return OK;
+}
+
+void SurfaceTexture::cancelBuffer(int buf) {
+    Mutex::Autolock lock(mMutex);
+    if (buf < 0 || mBufferCount <= buf) {
+        LOGE("cancelBuffer: slot index out of range [0, %d]: %d", mBufferCount,
+                buf);
+        return;
+    } else if (!mSlots[buf].mOwnedByClient) {
+        LOGE("cancelBuffer: slot %d is not owned by the client", buf);
+        return;
+    }
+    mSlots[buf].mOwnedByClient = false;
+}
+
+status_t SurfaceTexture::setCrop(const Rect& reg) {
+    Mutex::Autolock lock(mMutex);
+    // XXX: How should we handle crops?
+    return OK;
+}
+
+status_t SurfaceTexture::setTransform(uint32_t transform) {
+    Mutex::Autolock lock(mMutex);
+    // XXX: How should we handle transforms?
+    return OK;
+}
+
+status_t SurfaceTexture::updateTexImage() {
+    Mutex::Autolock lock(mMutex);
+
+    // We always bind the texture even if we don't update its contents.
+    glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTexName);
+
+    // Initially both mCurrentTexture and mLastQueued are INVALID_BUFFER_SLOT,
+    // so this check will fail until a buffer gets queued.
+    if (mCurrentTexture != mLastQueued) {
+        // XXX: Figure out the right target.
+        mCurrentTexture = mLastQueued;
+        EGLImageKHR image = mSlots[mCurrentTexture].mEglImage;
+        if (image == EGL_NO_IMAGE_KHR) {
+            EGLDisplay dpy = eglGetCurrentDisplay();
+            sp<GraphicBuffer> graphicBuffer = mSlots[mCurrentTexture].mGraphicBuffer;
+            image = createImage(dpy, graphicBuffer);
+            mSlots[mCurrentTexture].mEglImage = image;
+            mSlots[mCurrentTexture].mEglDisplay = dpy;
+        }
+        glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, (GLeglImageOES)image);
+        GLint error = glGetError();
+        if (error != GL_NO_ERROR) {
+            LOGE("error binding external texture image %p (slot %d): %#04x",
+                    image, mCurrentTexture, error);
+            return -EINVAL;
+        }
+    }
+    return OK;
+}
+
+void SurfaceTexture::freeAllBuffers() {
+    for (int i = 0; i < NUM_BUFFER_SLOTS; i++) {
+        mSlots[i].mGraphicBuffer = 0;
+        mSlots[i].mOwnedByClient = false;
+        if (mSlots[i].mEglImage != EGL_NO_IMAGE_KHR) {
+            eglDestroyImageKHR(mSlots[i].mEglDisplay, mSlots[i].mEglImage);
+            mSlots[i].mEglImage = EGL_NO_IMAGE_KHR;
+            mSlots[i].mEglDisplay = EGL_NO_DISPLAY;
+        }
+    }
+}
+
+EGLImageKHR SurfaceTexture::createImage(EGLDisplay dpy,
+        const sp<GraphicBuffer>& graphicBuffer) {
+    EGLClientBuffer cbuf = (EGLClientBuffer)graphicBuffer->getNativeBuffer();
+    EGLint attrs[] = {
+        EGL_IMAGE_PRESERVED_KHR,    EGL_TRUE,
+        EGL_NONE,
+    };
+    EGLImageKHR image = eglCreateImageKHR(dpy, EGL_NO_CONTEXT,
+            EGL_NATIVE_BUFFER_ANDROID, cbuf, attrs);
+    EGLint error = eglGetError();
+    if (error != EGL_SUCCESS) {
+        LOGE("error creating EGLImage: %#x", error);
+    } else if (image == EGL_NO_IMAGE_KHR) {
+        LOGE("no error reported, but no image was returned by "
+                "eglCreateImageKHR");
+    }
+    return image;
+}
+
+}; // namespace android