From 30f413b74f883f7e3984dfe39d825aa6c5f16132 Mon Sep 17 00:00:00 2001 From: Kim Motoyoshi Kalland Date: Mon, 5 Oct 2009 14:55:50 +0200 Subject: Fixed noisy looking textures in Basic Drawing example with GL2 engine. When running the Basic Drawing example with the GL2 paint engine and antialiasing enabled, textures looked noisy. When antialiasing was enabled, the example translated the painter half a pixel to get sharp lines. This caused the textures to be sampled at texel corners. Without linear interpolation, sampling textures at texel corners is unpredictable. The fix is to not translate the painter. Reviewed-by: Gunnar --- examples/painting/basicdrawing/renderarea.cpp | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/examples/painting/basicdrawing/renderarea.cpp b/examples/painting/basicdrawing/renderarea.cpp index e8222af..4f07a2d 100644 --- a/examples/painting/basicdrawing/renderarea.cpp +++ b/examples/painting/basicdrawing/renderarea.cpp @@ -136,11 +136,9 @@ void RenderArea::paintEvent(QPaintEvent * /* event */) QPainter painter(this); painter.setPen(pen); painter.setBrush(brush); - if (antialiased) { + if (antialiased) painter.setRenderHint(QPainter::Antialiasing, true); //! [9] - painter.translate(+0.5, +0.5); - } //! [10] for (int x = 0; x < width(); x += 100) { @@ -202,6 +200,7 @@ void RenderArea::paintEvent(QPaintEvent * /* event */) } } + painter.setRenderHint(QPainter::Antialiasing, false); painter.setPen(palette().dark().color()); painter.setBrush(Qt::NoBrush); painter.drawRect(QRect(0, 0, width() - 1, height() - 1)); -- cgit v0.12