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Optimize qt_findAtNxFile by reducing the amount of allocations 

Change-Id: I94a2b40933f9469f509a4cc54d68138696704ba2
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>
bb10
Olivier Goffart 2015-11-30 15:26:16 +01:00 committed by Olivier Goffart (Woboq GmbH)
parent 420b4dbece
commit 9dde61f4b3
1 changed files with 5 additions and 4 deletions
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9
src/gui/image/qicon.cpp
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@ -1,6 +1,7 @@
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Copyright (C) 2015 Olivier Goffart <ogoffart@woboq.com>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
@ -1400,15 +1401,15 @@ QString qt_findAtNxFile(const QString &baseFileName, qreal targetDevicePixelRati
if (disableNxImageLoading)
return baseFileName;
QString atNx = QLatin1String("@%1x");
int dotIndex = baseFileName.lastIndexOf(QLatin1Char('.'));
if (dotIndex == -1) /* no dot */
dotIndex = baseFileName.size(); /* append */
QString atNxfileName = baseFileName;
atNxfileName.insert(dotIndex, QLatin1String("@2x"));
// Check for @Nx, ..., @3x, @2x file versions,
for (int n = qCeil(targetDevicePixelRatio); n > 1; --n) {
QString atNxfileName = baseFileName;
atNxfileName.insert(dotIndex, atNx.arg(n));
for (int n = qMin(qCeil(targetDevicePixelRatio), 9); n > 1; --n) {
atNxfileName[dotIndex + 1] = QLatin1Char('0' + n);
if (QFile::exists(atNxfileName)) {
if (sourceDevicePixelRatio)
*sourceDevicePixelRatio = n;