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From 84756d94c73885803ad8044099ab47c0c49b5076 Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@digia.com>
Date: Thu, 23 Jan 2014 11:45:22 +0100
Subject: [PATCH] eglfs: Fix quad coordinates
Prevent artifacts on raster windows by properly mapping
the coordinates to [-1,1].
Upstream-Status: Backport
Task-number: QTBUG-36370
Change-Id: I95d0d03952f597ef4ce6a950c6533a3af2df964a
Reviewed-by: Andy Nichols <andy.nichols@digia.com>
Signed-off-by: Jonathan Liu <net147@gmail.com>
---
src/plugins/platforms/eglfs/qeglfscompositor.cpp | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/plugins/platforms/eglfs/qeglfscompositor.cpp b/src/plugins/platforms/eglfs/qeglfscompositor.cpp
index 845bb5b..1efc4f7 100644
--- a/src/plugins/platforms/eglfs/qeglfscompositor.cpp
+++ b/src/plugins/platforms/eglfs/qeglfscompositor.cpp
@@ -153,10 +153,11 @@ void QEglFSCompositor::render(QEglFSWindow *window, uint texture, bool raster)
QPoint tl = r.topLeft();
QPoint br = r.bottomRight();
+ // Map to [-1,1]
GLfloat x1 = (tl.x() / sr.width()) * 2 - 1;
- GLfloat x2 = (br.x() / sr.width()) * 2 - 1;
GLfloat y1 = ((sr.height() - tl.y()) / sr.height()) * 2 - 1;
- GLfloat y2 = ((sr.height() - br.y()) / sr.height()) * 2 - 1;
+ GLfloat x2 = ((br.x() + 1) / sr.width()) * 2 - 1;
+ GLfloat y2 = ((sr.height() - (br.y() + 1)) / sr.height()) * 2 - 1;
if (!raster)
qSwap(y1, y2);
--
1.7.1
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