File 0003-libcamera-software_isp-Check-processed-window-size-a.patch of Package libcamera

From 2611679a0a425bad4f071fb70c513f73be5132df Mon Sep 17 00:00:00 2001
From: Milan Zamazal <mzamazal@redhat.com>
Date: Thu, 21 Aug 2025 15:41:39 +0200
Subject: [PATCH 03/17] libcamera: software_isp: Check processed window size
 alignment

The window of the image that should be debayered must be aligned to the
bayer pattern size.  This is already ensured for the window corner
coordinates but not for the window sizes.

We can either make the window sizes aligned similarly to how the window
corner coordinates are aligned or reject an unaligned configuration.
This patches chooses the latter as using a different window size than
the requested output size could lead to artefacts.  Since such a
situation is not expected to occur in correctly set up environments, the
change should have no negative impact.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
---
 src/libcamera/software_isp/debayer_cpu.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp
index 185edd814..3200b0c53 100644
--- a/src/libcamera/software_isp/debayer_cpu.cpp
+++ b/src/libcamera/software_isp/debayer_cpu.cpp
@@ -539,7 +539,17 @@ int DebayerCpu::configure(const StreamConfiguration &inputCfg,
 	window_.y = ((inputCfg.size.height - outputCfg.size.height) / 2) &
 		    ~(inputConfig_.patternSize.height - 1);
 	window_.width = outputCfg.size.width;
+	if (window_.width % inputConfig_.patternSize.width != 0) {
+		LOG(Debayer, Error)
+			<< "Output width is not a multiple of the bayer pattern width";
+		return -EINVAL;
+	}
 	window_.height = outputCfg.size.height;
+	if (window_.height % inputConfig_.patternSize.height != 0) {
+		LOG(Debayer, Error)
+			<< "Output height is not a multiple of the bayer pattern height";
+		return -EINVAL;
+	}
 
 	/*
 	 * Set the stats window to the whole processed window. Its coordinates are
-- 
2.50.1