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Viewing changes to src/common/timestamp_impl.h

  • Committer: CI Train Bot
  • Author(s): Nick Dedekind
  • Date: 2015-10-21 11:46:54 UTC
  • mfrom: (369.4.13 qtmir)
  • Revision ID: ci-train-bot@canonical.com-20151021114654-zxs13246bxcdci9l
Added touch performance tracing and test.
Approved by: Gerry Boland

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Lines of Context:
src/common/timestamp_impl.h
 
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#include <QCoreApplication>
 
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#include <QVariant>
 
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extern "C" {
 
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        void resetStartTime(std::chrono::nanoseconds timestamp);
 
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        std::chrono::nanoseconds getStartTime(std::chrono::nanoseconds timestamp, bool allowReset = true);
 
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}
 
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namespace qtmir {
 
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template<typename T>
 
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T compressTimestamp(std::chrono::nanoseconds timestamp)
 
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{
 
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    std::chrono::nanoseconds startTime = getStartTime(timestamp);
 
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    std::chrono::nanoseconds result = timestamp - startTime;
 
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    if (std::numeric_limits<std::chrono::nanoseconds::rep>::max() > std::numeric_limits<T>::max() &&
 
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        result > std::chrono::nanoseconds(std::numeric_limits<T>::max())) {
 
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        // we've overflowed the boundaries of the millisecond type.
 
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        resetStartTime(timestamp);
 
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        return 0;
 
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    }
 
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    return result.count();
 
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}
 
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template<typename T>
 
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std::chrono::nanoseconds uncompressTimestamp(T timestamp)
 
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{
 
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    auto tsNS = std::chrono::nanoseconds(timestamp);
 
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    return getStartTime(tsNS, false) + std::chrono::nanoseconds(tsNS);
 
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}
 
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}
 
 
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