fix [2068105] implement queueBuffer/lockBuffer/dequeueBuffer properly

Rewrote SurfaceFlinger's buffer management from the ground-up.
The design now support an arbitrary number of buffers per surface, however the current implementation is limited to four. Currently only 2 buffers are used in practice.

The main new feature is to be able to dequeue all buffers at once (very important when there are only two). 

A client can dequeue all buffers until there are none available, it can lock all buffers except the last one that is used for composition. The client will block then, until a new buffer is enqueued.

The current implementation requires that buffers are locked in the same order they are dequeued and enqueued in the same order they are locked. Only one buffer can be locked at a time.

eg. Allowed sequence:   DQ, DQ, LOCK, Q, LOCK, Q
eg. Forbidden sequence: DQ, DQ, LOCK, LOCK, Q, Q

1 files changed, 134 insertions, 0 deletions

diff --git a/libs/ui/SurfaceBuffer.cpp b/libs/ui/SurfaceBuffer.cpp
new file mode 100644
index 0000000000..0510bc1f9d
--- /dev/null
+++ b/libs/ui/SurfaceBuffer.cpp
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2009 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 "SurfaceBuffer"
+
+#include <stdint.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+#include <binder/Parcel.h>
+
+#include <ui/BufferMapper.h>
+#include <ui/Rect.h>
+#include <private/ui/SurfaceBuffer.h>
+
+namespace android {
+
+// ============================================================================
+//  SurfaceBuffer
+// ============================================================================
+
+SurfaceBuffer::SurfaceBuffer() 
+    : BASE(), mOwner(false), mBufferMapper(BufferMapper::get()), mIndex(-1)
+{
+    width  = 
+    height = 
+    stride = 
+    format = 
+    usage  = 0;
+    handle = NULL;
+}
+
+SurfaceBuffer::SurfaceBuffer(const Parcel& data) 
+    : BASE(), mOwner(true), mBufferMapper(BufferMapper::get())
+{
+    // we own the handle in this case
+    width  = data.readInt32();
+    if (width < 0) {
+        width = height = stride = format = usage = 0;
+        handle = 0;
+    } else {
+        height = data.readInt32();
+        stride = data.readInt32();
+        format = data.readInt32();
+        usage  = data.readInt32();
+        handle = data.readNativeHandle();
+    }
+}
+
+SurfaceBuffer::~SurfaceBuffer()
+{
+    if (handle && mOwner) {
+        native_handle_close(handle);
+        native_handle_delete(const_cast<native_handle*>(handle));
+    }
+}
+
+status_t SurfaceBuffer::lock(uint32_t usage, void** vaddr)
+{
+    const Rect lockBounds(width, height);
+    status_t res = lock(usage, lockBounds, vaddr);
+    return res;
+}
+
+status_t SurfaceBuffer::lock(uint32_t usage, const Rect& rect, void** vaddr)
+{
+    if (rect.left < 0 || rect.right  > this->width || 
+        rect.top  < 0 || rect.bottom > this->height) {
+        LOGE("locking pixels (%d,%d,%d,%d) outside of buffer (w=%d, h=%d)",
+                rect.left, rect.top, rect.right, rect.bottom, 
+                this->width, this->height);
+        return BAD_VALUE;
+    }
+    status_t res = getBufferMapper().lock(handle, usage, rect, vaddr);
+    return res;
+}
+
+status_t SurfaceBuffer::unlock()
+{
+    status_t res = getBufferMapper().unlock(handle);
+    return res;
+}
+
+status_t SurfaceBuffer::writeToParcel(Parcel* reply, 
+        android_native_buffer_t const* buffer)
+{
+    if (buffer == NULL)
+        return BAD_VALUE;
+
+    if (buffer->width < 0 || buffer->height < 0)
+        return BAD_VALUE;
+
+    status_t err = NO_ERROR;
+    if (buffer->handle == NULL) {
+        // this buffer doesn't have a handle
+        reply->writeInt32(NO_MEMORY);
+    } else {
+        reply->writeInt32(buffer->width);
+        reply->writeInt32(buffer->height);
+        reply->writeInt32(buffer->stride);
+        reply->writeInt32(buffer->format);
+        reply->writeInt32(buffer->usage);
+        err = reply->writeNativeHandle(buffer->handle);
+    }
+    return err;
+}
+
+
+void SurfaceBuffer::setIndex(int index) {
+    mIndex = index;
+}
+
+int SurfaceBuffer::getIndex() const {
+    return mIndex;
+}
+
+
+}; // namespace android
+