From f2c47d12386bf9edcbdc79ea31682a60f9d119a4 Mon Sep 17 00:00:00 2001
From: Peter Penz <peter.penz19@gmail.com>
Date: Sun, 21 Sep 2008 21:24:54 +0000
Subject: [PATCH] =?utf8?q?Experimental=20patch=20provided=20by=20Fredrik?=
 =?utf8?q?=20H=C3=B6glund:=20Use=20Xrender=20to=20scale=20the=20preview=20?=
 =?utf8?q?pixmaps=20in=20the=20X=20server.=20This=20is=20accelerated=20in?=
 =?utf8?q?=20HW=20by=20the=20latest=20version=20of=20the=20NVidia=20driver?=
 =?utf8?q?=20and=20by=20the=20open=20source=20ATI,=20Intel=20and=20Nouveau?=
 =?utf8?q?=20drivers=20when=20they're=20using=20the=20EXA=20acceleration?=
 =?utf8?q?=20architecture.=20EXA=20will=20be=20the=20default=20in=20the=20?=
 =?utf8?q?upcoming=201.6=20release=20of=20the=20server,=20which=20is=20sch?=
 =?utf8?q?eduled=20for=20December.?=
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CCMAIL: fredrik@kde.org

svn path=/trunk/KDE/kdebase/apps/; revision=863342
---
 src/kfilepreviewgenerator.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/kfilepreviewgenerator.cpp b/src/kfilepreviewgenerator.cpp
index f614aae63..cbbb861ec 100644
--- a/src/kfilepreviewgenerator.cpp
+++ b/src/kfilepreviewgenerator.cpp
@@ -36,6 +36,12 @@
 #include <QScrollBar>
 #include <QIcon>
 
+#ifdef Q_WS_X11
+#  include <QX11Info>
+#  include <X11/Xlib.h>
+#  include <X11/extensions/Xrender.h>
+#endif
+
 /**
  * If the passed item view is an instance of QListView, expensive
  * layout operations are blocked in the constructor and are unblocked
@@ -575,7 +581,35 @@ bool KFilePreviewGenerator::Private::applyImageFrame(QPixmap& icon)
 void KFilePreviewGenerator::Private::limitToSize(QPixmap& icon, const QSize& maxSize)
 {
     if ((icon.width() > maxSize.width()) || (icon.height() > maxSize.height())) {
+#ifdef Q_WS_X11
+        // Assume that the texture size limit is 2048x2048
+        if ((icon.width() <= 2048) && (icon.height() <= 2048)) {
+            QSize size = icon.size();
+            size.scale(maxSize, Qt::KeepAspectRatio);
+
+            const qreal factor = size.width() / qreal(icon.width());
+
+            XTransform xform = {{
+                { XDoubleToFixed(1 / factor), 0, 0 },
+                { 0, XDoubleToFixed(1 / factor), 0 },
+                { 0, 0, XDoubleToFixed(1) }
+            }};
+
+            QPixmap pixmap(size);
+            pixmap.fill(Qt::transparent);
+
+            Display *dpy = QX11Info::display();
+            XRenderSetPictureFilter(dpy, icon.x11PictureHandle(), FilterBilinear, 0, 0);
+            XRenderSetPictureTransform(dpy, icon.x11PictureHandle(), &xform);
+            XRenderComposite(dpy, PictOpOver, icon.x11PictureHandle(), None, pixmap.x11PictureHandle(),
+                             0, 0, 0, 0, 0, 0, pixmap.width(), pixmap.height());
+            icon = pixmap;
+        } else {
+            icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation);
+        }
+#else
         icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation);
+#endif
     }
 }
 
-- 
2.47.3