[v2,3/6] libcamera: software_isp: Check processed window size alignment
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Message ID 20250911135144.56586-4-mzamazal@redhat.com
State New
Headers show
Series
  • Fix stats related problems in software ISP
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Commit Message

Milan Zamazal Sept. 11, 2025, 1:51 p.m. UTC 
The window of the image that should be debayered must be aligned to the
bayer pattern size (this is a requirement of the current debayering
implementation).  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.

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

Patch
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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