Refactor image size API to return struct

Changed native_image_get_size to return a native_size_t struct instead of using output parameters for width and height. This simplifies the API and improves error handling by returning zero size on failure.

Author: lijy91

src/capi/image_c.cpp

@@ -77,26 +77,23 @@ void native_image_destroy(native_image_t image) {
 }
 
 // Get the size of an image in pixels
-void native_image_get_size(native_image_t image,
-                           double* width,
-                           double* height) {
-  if (!image || !width || !height) {
-    if (width)
-      *width = 0.0;
-    if (height)
-      *height = 0.0;
-    return;
+native_size_t native_image_get_size(native_image_t image) {
+  native_size_t result = {0.0, 0.0};
+
+  if (!image) {
+    return result;
   }
 
   try {
     auto img = static_cast<std::shared_ptr<Image>*>(image);
     auto size = (*img)->GetSize();
-    *width = size.width;
-    *height = size.height;
+    result.width = size.width;
+    result.height = size.height;
   } catch (...) {
-    *width = 0.0;
-    *height = 0.0;
+    // Return zero size on error
   }
+
+  return result;
 }
 
 // Get the image format string for debugging purposes

src/capi/image_c.h

@@ -4,6 +4,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "geometry_c.h"
+
 #if _WIN32
 #define FFI_PLUGIN_EXPORT __declspec(dllexport)
 #else
@@ -57,11 +59,10 @@ void native_image_destroy(native_image_t image);
 /**
  * Get the size of an image in pixels
  * @param image The image
- * @param width Pointer to store the width (will be set to 0 if invalid)
- * @param height Pointer to store the height (will be set to 0 if invalid)
+ * @return Size of the image (width and height will be 0 if invalid)
  */
 FFI_PLUGIN_EXPORT
-void native_image_get_size(native_image_t image, double* width, double* height);
+native_size_t native_image_get_size(native_image_t image);
 
 /**
  * Get the image format string for debugging purposes