From 33044c3816ce99db849aa50a9c97353056535968 Mon Sep 17 00:00:00 2001
From: davc0n <57829860+davc0n@users.noreply.github.com>
Date: Mon, 4 May 2026 17:08:27 +0200
Subject: render: scale background to monitor resolution (#14250)

* render: scale background to monitor resolution

Currently the background is not scaled, e.g. 8k size image always uses
~128Mb of VRAM.
We could reduce the consumption for low-end devices and monitors with
lower resolution:
- ~8Mb for 1080p
- ~16Mb for 2k
- ~32Mb for 4k

* render: use gpu to scale bgtex and fix missing reset on size change
---
 src/helpers/Monitor.cpp | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

(limited to 'src/helpers/Monitor.cpp')

diff --git a/src/helpers/Monitor.cpp b/src/helpers/Monitor.cpp
index a5195a94..b2e94a31 100644
--- a/src/helpers/Monitor.cpp
+++ b/src/helpers/Monitor.cpp
@@ -7,12 +7,10 @@
 #include "../protocols/ColorManagement.hpp"
 #include "../Compositor.hpp"
 #include "../config/ConfigValue.hpp"
-#include "../config/ConfigManager.hpp"
 #include "../config/shared/monitor/MonitorRuleManager.hpp"
 #include "../config/shared/workspace/WorkspaceRuleManager.hpp"
 #include "../config/shared/animation/AnimationTree.hpp"
 #include "../protocols/GammaControl.hpp"
-#include "../devices/ITouch.hpp"
 #include "../protocols/LayerShell.hpp"
 #include "../protocols/PresentationTime.hpp"
 #include "../protocols/DRMLease.hpp"
@@ -34,7 +32,6 @@
 #include "../layout/LayoutManager.hpp"
 #include "../i18n/Engine.hpp"
 #include "../helpers/cm/ColorManagement.hpp"
-#include "sync/SyncTimeline.hpp"
 #include "time/Time.hpp"
 #include "../desktop/view/LayerSurface.hpp"
 #include "../desktop/state/FocusState.hpp"
@@ -799,9 +796,10 @@ bool CMonitor::applyMonitorRule(Config::CMonitorRule&& pMonitorRule, bool force)
         }
     }
 
-    const auto WAS10B  = m_enabled10bit;
-    const auto OLDRES  = m_pixelSize;
-    bool       success = false;
+    const auto WAS10B             = m_enabled10bit;
+    const auto OLDPIXELSIZE       = m_pixelSize;
+    const auto OLDTRANSFORMEDSIZE = m_transformedSize;
+    bool       success            = false;
 
     // Needed in case we are switching from a custom modeline to a standard mode
     m_customDrmMode = {};
@@ -1067,13 +1065,18 @@ bool CMonitor::applyMonitorRule(Config::CMonitorRule&& pMonitorRule, bool force)
 
     updateMatrix();
 
-    if ((WAS10B != m_enabled10bit || OLDRES != m_pixelSize)) {
+    if ((WAS10B != m_enabled10bit || OLDPIXELSIZE != m_pixelSize)) {
         m_resources.reset(); // TODO skip for 10bit change and fp16?
 
         if (g_pHyprRenderer && g_pHyprRenderer->glBackend())
             g_pHyprRenderer->glBackend()->destroyMonitorResources(m_self);
     }
 
+    if (m_background && (OLDPIXELSIZE != m_pixelSize || OLDTRANSFORMEDSIZE != m_transformedSize)) {
+        Log::logger->log(Log::DEBUG, "{} reset BGTex: pixelSize {} -> {}, transformedSize {} -> {}", m_name, OLDPIXELSIZE, m_pixelSize, OLDTRANSFORMEDSIZE, m_transformedSize);
+        m_background.reset();
+    }
+
     g_pCompositor->scheduleMonitorStateRecheck();
 
     m_damage.setSize(m_transformedSize);
-- 
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