Move some of the sprite math out of the actor into the sprite

src/actor.c

@@ -235,16 +235,18 @@ akerr_ErrorContext *akgl_actor_render(akgl_Actor *obj, SDL_Renderer *renderer)
 	// get cleaned up on the next logic update. Just pass on rendering them this frame.
 	SUCCEED_RETURN(errctx);
     }
+
+    ATTEMPT {
+	CATCH(errctx,
+	      akgl_sprite_sheet_coords_for_frame(
+		  curSprite,
+		  &src,
+		  obj->curSpriteFrameId)
+	    );
+    } CLEANUP {
+    } PROCESS(errctx) {
+    } FINISH(errctx, true);
     
-    src.x = curSprite->width * curSprite->frameids[obj->curSpriteFrameId];
-    if ( src.x >= curSprite->sheet->texture->w ) {
-	src.y = ((int)src.x / curSprite->sheet->texture->w) * curSprite->height;
-	src.x = ((int)src.x % curSprite->sheet->texture->w);
-    } else {
-	src.y = 0;
-    }
-    src.w = curSprite->width;
-    src.h = curSprite->height;
     if ( obj->parent != NULL ) {
 	dest.x = (obj->parent->x + obj->x - camera.x);
 	dest.y = (obj->parent->y + obj->y - camera.y);

src/sprite.c

@@ -13,6 +13,27 @@
 #include <akgl/staticstring.h>
 #include <akgl/iterator.h>
 
+akerr_ErrorContext *akgl_sprite_sheet_coords_for_frame(akgl_Sprite *self, SDL_FRect *srccoords, uint8_t frameid)
+{
+    PREPARE_ERROR(e);
+
+    FAIL_ZERO_RETURN(e, self, AKERR_NULLPOINTER, "NULL sprite");
+    FAIL_ZERO_RETURN(e, srccoords, AKERR_NULLPOINTER, "NULL SDL_Rect");
+    FAIL_ZERO_RETURN(e, self->sheet, AKERR_NULLPOINTER, "NULL spritesheet");
+
+    srccoords->x = self->width * self->frameids[frameid];
+    if ( srccoords->x >= self->sheet->texture->w ) {
+	srccoords->y = ((int)srccoords->x / self->sheet->texture->w) * self->height;
+	srccoords->x = ((int)srccoords->x % self->sheet->texture->w);
+    } else {
+	srccoords->y = 0;
+    }
+    srccoords->w = self->width;
+    srccoords->h = self->height;
+
+    SUCCEED_RETURN(e);
+}
+
 static akerr_ErrorContext *akgl_sprite_load_json_spritesheet(json_t *json, akgl_SpriteSheet **sheet, char *relative_path)
 {
     PREPARE_ERROR(errctx);