From 6c04fcaa540521357f5b24c728618c57ae540f36 Mon Sep 17 00:00:00 2001
From: Marisa the Magician <marisa@sayachan.org>
Date: Sun, 30 Mar 2025 13:47:26 +0200
Subject: [PATCH] cropng: skip rewriting images if there's nothing to crop.

---
 cropng.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/cropng.c b/cropng.c
index 64d8182..5645777 100644
--- a/cropng.c
+++ b/cropng.c
@@ -286,9 +286,17 @@ void processpic( const char *fname )
 		if ( trns ) free(trns);
 		return;
 	}
-	uint8_t *odata = calloc(cropw*croph,pxsize);
 	uint32_t ow = cropw, oh = croph;
 	int32_t ox = x-cropx, oy = y-cropy;
+	if ( (ow == w) && (oh == h) && (ox == x) && (oy == y) )
+	{
+		printf(" Nothing to crop, skipping.\n");
+		free(idata);
+		if ( plte ) free(plte);
+		if ( trns ) free(trns);
+		return;
+	}
+	uint8_t *odata = calloc(cropw*croph,pxsize);
 	for ( uint32_t cy=0; cy<croph; cy++ )
 	{
 		uint32_t ccy = cy+cropy;