From 5d8804fdebedf90ac0c5f4c8f301bb48dfd16e69 Mon Sep 17 00:00:00 2001
From: Andrew Haynes <dmm.dev@pm.me>
Date: Sun, 22 Mar 2026 18:27:51 -0400
Subject: [PATCH] API: created helper functions to inherit image formats

---
 include/image/imgio.h | 10 ++++++++--
 src/imgio.c           | 35 +++++++++++++++++++++++++++++------
 2 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/include/image/imgio.h b/include/image/imgio.h
index c3db9bd..f4950a4 100644
--- a/include/image/imgio.h
+++ b/include/image/imgio.h
@@ -16,9 +16,15 @@ int
 jpeg_save(const unsigned int* src_buf, const JPEG* attr, const char* name);
 
 void
-ppm_to_jpeg(PPM* in, JPEG* out);
+transcode_to_jpeg(PPM* in, JPEG* out);
 
 void
-jpeg_to_ppm(JPEG* input, PPM* out);
+transcode_to_ppm(JPEG* input, PPM* out);
+
+PPM
+inherit_from_jpeg(const JPEG* in, const char fmt);
+
+JPEG
+inherit_from_ppm(const PPM* in);
 
 #endif
diff --git a/src/imgio.c b/src/imgio.c
index ecc6b19..c9e0c2a 100644
--- a/src/imgio.c
+++ b/src/imgio.c
@@ -189,20 +189,43 @@ jpeg_save(const unsigned int* src_buf, const JPEG* attr, const char* name)
 }
 
 void
-ppm_to_jpeg(PPM* in, JPEG* out)
+transcode_to_jpeg(PPM* in, JPEG* out)
 {
-	unsigned int* src_buf = ppm_load(in->name, in);
+	unsigned int* dst = ppm_load(in->name, in);
 	out->width = in->width;
 	out->height = in->height;
-	jpeg_save(src_buf, out, out->name);
+	jpeg_save(dst, out, out->name);
+        free(dst);
 }
 
 void
-jpeg_to_ppm(JPEG* input, PPM* out)
+transcode_to_ppm(JPEG* input, PPM* out)
 {
-	unsigned int* src_buf = jpeg_load(input);
+	unsigned int* dst = jpeg_load(input);
 	out->width = input->width;
 	out->height = input->height;
 	out->len = out->width * out->height;
-	ppm_save(src_buf, *out);
+	ppm_save(dst, *out);
+        free(dst);
+}
+
+PPM
+inherit_from_jpeg(const JPEG* in, const char fmt) {
+        PPM image = {
+                .width = in->width,
+                .height = in->height,
+                .len = in->width * in->height,
+                .fmt = fmt
+        };
+        return image;
+}
+
+JPEG
+inherit_from_ppm(const PPM* in) {
+        JPEG image = {
+                .width = in->width,
+                .height = in->height,
+                .len = in->width * in->height,
+        };
+        return image;
 }