From 2798067d54bb8595d731a3aef09c7ad972a1790d Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Fri, 23 Feb 2024 00:03:17 -0800
Subject: [PATCH] add Refresh_Image_Info

---
 include/Refresh_Image.h | 14 ++++++++++++++
 src/Refresh_Image.c     | 26 ++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/include/Refresh_Image.h b/include/Refresh_Image.h
index 063de6a..d5a23a1 100644
--- a/include/Refresh_Image.h
+++ b/include/Refresh_Image.h
@@ -63,6 +63,20 @@ REFRESHAPI uint8_t* Refresh_Image_Load(
 	int32_t *len
 );
 
+/* Get image dimensions without fully decoding the image.
+ *
+ * w:		    Filled with the width of the image.
+ * h:		    Filled with the height of the image.
+ * len:			Filled with the length of pixel data in bytes.
+ */
+REFRESHAPI uint8_t Refresh_Image_Info(
+	uint8_t *bufferPtr,
+	int32_t bufferLength,
+	int32_t *w,
+	int32_t *h,
+	int32_t *len
+);
+
 /* Frees memory returned by Refresh_Image_Load. Do NOT free the memory yourself!
  *
  * mem: A pointer previously returned by Refresh_Image_LoadPNG.
diff --git a/src/Refresh_Image.c b/src/Refresh_Image.c
index 49f2a00..b82b70d 100644
--- a/src/Refresh_Image.c
+++ b/src/Refresh_Image.c
@@ -232,6 +232,32 @@ uint8_t* Refresh_Image_Load(
 	return result;
 }
 
+uint8_t Refresh_Image_Info(
+	uint8_t *bufferPtr,
+	int32_t bufferLength,
+	int32_t *w,
+	int32_t *h,
+	int32_t *len
+) {
+	int32_t format;
+	int32_t result;
+
+	result = stbi_info_from_memory(
+		bufferPtr,
+		bufferLength,
+		w,
+		h,
+		&format
+	);
+
+	if (result == 0)
+	{
+		SDL_LogWarn(SDL_LOG_CATEGORY_ERROR, "Image info failed: %s", stbi_failure_reason());
+	}
+
+	return (uint8_t) result;
+}
+
 void Refresh_Image_Free(uint8_t *mem)
 {
 	SDL_SIMDFree(mem);