Reserve vector size ahead of time in the AttachmentPack class

Change-Id: Iaed11a9bc23da076dff7006d7aa34f17c6c2aac8
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/render/backend/attachmentpack.cpp b/src/render/backend/attachmentpack.cpp
index 6dee7587b..9a08fdde4 100644
--- a/src/render/backend/attachmentpack.cpp
+++ b/src/render/backend/attachmentpack.cpp
@@ -67,11 +67,13 @@ AttachmentPack::AttachmentPack(const RenderTargetSelector *selector, const Rende
 
     // If nothing is specified, use all the attachments as draw buffers
     if (selectedAttachmentPoints.isEmpty()) {
+        m_drawBuffers.reserve(m_attachments.size());
         for (const Attachment &attachment : qAsConst(m_attachments))
             // only consider Color Attachments
             if (attachment.m_point <= QRenderTargetOutput::Color15)
                 m_drawBuffers.push_back((int) attachment.m_point);
     } else {
+        m_drawBuffers.reserve(selectedAttachmentPoints.size());
         for (QRenderTargetOutput::AttachmentPoint drawBuffer : selectedAttachmentPoints)
             if (drawBuffer <= QRenderTargetOutput::Color15)
                 m_drawBuffers.push_back((int) drawBuffer);