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QmlDesigner.NodeInstances: Use SharedMemory for image transfer if available

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Sending images over the local socket is slow, but the Mac has a 4MB limit
shared memory. So we now use what we get and than fallback to the local
socket.

Change-Id: Idf40ee1603572c9e45bb1ed3e1abc7caf19e6fca
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>
This commit is contained in:
Marco Bubke
2012-08-30 17:10:42 +02:00
parent 463eca4053
commit 93e329e1eb
1 changed files with 54 additions and 3 deletions
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57
share/qtcreator/qml/qmlpuppet/container/imagecontainer.cpp
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@@ -30,15 +30,21 @@
#include "imagecontainer.h"
#include <QSharedMemory>
#include <QCache>
namespace QmlDesigner {
static QCache<qint32, QSharedMemory> globalSharedMemoryCache(10000);
ImageContainer::ImageContainer()
: m_instanceId(-1)
{
}
ImageContainer::ImageContainer(qint32 instanceId, const QImage &image)
: m_image(image), m_instanceId(instanceId)
: m_image(image),
m_instanceId(instanceId)
{
}
@@ -52,6 +58,25 @@ QImage ImageContainer::image() const
return m_image;
}
static QSharedMemory *createSharedMemory(qint32 key, int byteCount)
{
QSharedMemory *sharedMemory = globalSharedMemoryCache.take(key);
if (sharedMemory == 0)
sharedMemory = new QSharedMemory(QString::number(key));
if (sharedMemory->isAttached())
sharedMemory->detach();
bool sharedMemoryIsCreated = sharedMemory->create(byteCount);
if (sharedMemoryIsCreated) {
globalSharedMemoryCache.insert(key, sharedMemory);
return sharedMemory;
}
return 0;
}
QDataStream &operator<<(QDataStream &out, const ImageContainer &container)
{
out << container.instanceId();
@@ -63,11 +88,31 @@ QDataStream &operator<<(QDataStream &out, const ImageContainer &container)
out << image.size();
out << qint32(image.format());
out << qint32(image.byteCount());
out.writeRawData(reinterpret_cast<const char*>(image.constBits()), image.byteCount());
QSharedMemory *sharedMemory = createSharedMemory(container.instanceId(), image.byteCount());
out << qint32(sharedMemory != 0); // send if shared memory is used
if (sharedMemory) {
qMemCopy(sharedMemory->data(), image.constBits(), image.byteCount());
} else {
out.writeRawData(reinterpret_cast<const char*>(image.constBits()), image.byteCount());
}
return out;
}
void readSharedMemory(qint32 key, QImage *image, qint32 byteSize)
{
QSharedMemory sharedMemory(QString::number(key));
bool canAttach = sharedMemory.attach(QSharedMemory::ReadOnly);
if (canAttach)
{
qMemCopy(image->bits(), sharedMemory.constData(), byteSize);
}
}
QDataStream &operator>>(QDataStream &in, ImageContainer &container)
{
@@ -75,6 +120,7 @@ QDataStream &operator>>(QDataStream &in, ImageContainer &container)
qint32 bytesPerLine;
QSize imageSize;
qint32 format;
qint32 sharedmemoryIsUsed;
in >> container.m_instanceId;
@@ -82,9 +128,14 @@ QDataStream &operator>>(QDataStream &in, ImageContainer &container)
in >> imageSize;
in >> format;
in >> byteSize;
in >> sharedmemoryIsUsed;
container.m_image = QImage(imageSize, QImage::Format(format));
in.readRawData(reinterpret_cast<char*>(container.m_image.bits()), byteSize);
if (sharedmemoryIsUsed)
readSharedMemory(container.instanceId(), &container.m_image, byteSize);
else
in.readRawData(reinterpret_cast<char*>(container.m_image.bits()), byteSize);
return in;
}