Reverse allocation routines parameter order so that the context is at the back.

stb_image_resize.h

@@ -7,7 +7,7 @@
 
    #define STBIR_ASSERT(x) to avoid using assert.h.
 
-   #define STBIR_MALLOC(context,size) and STBIR_FREE(context,ptr) to avoid using stdlib.h malloc.
+   #define STBIR_MALLOC(size,context) and STBIR_FREE(ptr,context) to avoid using stdlib.h malloc.
       Each function makes exactly one call to malloc/free, so to avoid allocations,
       pass in a temp memory block as context and return that from MALLOC.
 
@@ -274,8 +274,8 @@ STBIRDEF int stbir_resize_region(  const void *input_pixels , int input_w , int
 #ifndef STBIR_MALLOC
 #include <stdlib.h>
 
-#define STBIR_MALLOC(c,x) malloc(x)
+#define STBIR_MALLOC(x,c) malloc(x)
-#define STBIR_FREE(c,x)   free(x)
+#define STBIR_FREE(x,c)   free(x)
 #endif
 
 #ifndef _MSC_VER
@@ -1831,7 +1831,7 @@ static int stbir__resize_arbitrary(
 	stbir__calculate_transform(&info, s0,t0,s1,t1,transform);
 	stbir__choose_filter(&info, h_filter, v_filter);
 	memory_required = stbir__calculate_memory(&info);
-	extra_memory = STBIR_MALLOC(alloc_context, memory_required);
+	extra_memory = STBIR_MALLOC(memory_required, alloc_context);
 
 	if (!extra_memory)
 		return 0;
@@ -1842,7 +1842,7 @@ static int stbir__resize_arbitrary(
 	                                        edge_horizontal, edge_vertical,
 	                                        colorspace, extra_memory, memory_required);
 
-	STBIR_FREE(alloc_context, extra_memory);
+	STBIR_FREE(extra_memory, alloc_context);
 
 	return result;
 }

tests/resample_test.cpp

@@ -30,7 +30,7 @@ public:
 	void* memory;
 } g_context;
 
-void* stbir_malloc(void* context, size_t size)
+void* stbir_malloc(size_t size, void* context)
 {
 	if (!context)
 		return malloc(size);
@@ -42,7 +42,7 @@ void* stbir_malloc(void* context, size_t size)
 	return real_context->memory;
 }
 
-void stbir_free(void* context, void* memory)
+void stbir_free(void* memory, void* context)
 {
 	if (!context)
 		return free(memory);