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Currently we're only able to put up one frame and we can have only one layer, but this is enough to draw a green circle in a sample app. A future CL will wire this up to Sky and add support for drawing a second frame. R=eseidel@chromium.org, ojan@chromium.org Review URL: https://codereview.chromium.org/740923002
29 lines
906 B
C++
29 lines
906 B
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "sky/compositor/surface_allocator.h"
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#include "base/logging.h"
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namespace sky {
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SurfaceAllocator::SurfaceAllocator(uint32_t id_namespace)
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: id_namespace_(id_namespace), next_id_(1) {
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DCHECK(id_namespace);
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}
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SurfaceAllocator::~SurfaceAllocator() {
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}
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uint64_t SurfaceAllocator::CreateSurfaceId() {
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// Surface IDs are 64 integers. The high 32 bits are the namespace of the ID,
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// which is assigned to us by the surfaces service. The lower 32 bits are ours
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// to allocate as we see fit. For simplicity, we just allocate them
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// sequentially. In principle, we could run out, but at 60 Hz, it takes
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// several years to run out.
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return static_cast<uint64_t>(id_namespace_) << 32 | next_id_++;
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}
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} // namespace sky
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