void RenderCache::renderSheet(int sheetNum)
{
if (mItems.contains(sheetNum))
emit sheetReady(mItems.value(sheetNum), sheetNum);
else
mRender->renderSheet(sheetNum);
int start = qMax(0, sheetNum - CACHE_PRE);
int end = qMin(project->previewSheetCount()-1, sheetNum + CACHE_POST);
for (int i=start; i<sheetNum; ++i)
{
if (!mItems.contains(i))
mRender->renderSheet(i);
}
for (int i=sheetNum+1; i<=end; ++i)
{
if (!mItems.contains(i))
mRender->renderSheet(i);
}
// Remove old values ........................
QHash<int, QImage>::iterator it = mItems.begin();
while (it != mItems.end())
{
if (it.key() < start || it.key() > end)
it = mItems.erase(it);
else
++it;
}
}
QImage RenderWorker::renderSheet(int sheetNum)
{
if (!mPopplerDoc)
return QImage();
mBusy = true;
QImage img = doRenderSheet(mPopplerDoc, sheetNum, mResolution);
emit sheetReady(img, sheetNum);
mBusy = false;
return img;
}
void RenderCache::onSheetReady(QImage img, int sheetNum)
{
mItems.insert(sheetNum, img);
emit sheetReady(img, sheetNum);
}