Just zoom the surface if the angle is divisible by 360

3 files changed, 6 insertions, 1 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index b7d73862..9214b87d 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -1096,7 +1096,11 @@ var LibrarySDL = {
     return ret;
   },
 
+  rotozoomSurface__deps: ['zoomSurface'],
   rotozoomSurface: function(src, angle, zoom, smooth) {
+    if (angle % 360 === 0) {
+      return _zoomSurface(src, zoom, zoom, smooth);
+    }
     var srcData = SDL.surfaces[src];
     var w = srcData.width * zoom;
     var h = srcData.height * zoom;
diff --git a/tests/sdl_rotozoom.c b/tests/sdl_rotozoom.c
index e81258d9..cdbdcc6f 100644
--- a/tests/sdl_rotozoom.c
+++ b/tests/sdl_rotozoom.c
@@ -6,7 +6,7 @@
 #include "emscripten.h"
 #endif
 
-const int numSprites = 8;
+const int numSprites = 9;
 SDL_Surface *screen;
 SDL_Surface *sprite[numSprites];
 
@@ -41,6 +41,7 @@ int main(int argc, char **argv) {
     sprite[5] = rotozoomSurface(sprite[1], 45, 0.5, SMOOTHING_ON);
     sprite[6] = zoomSurface(sprite[0], -0.5, 0.5, SMOOTHING_ON);
     sprite[7] = zoomSurface(sprite[0], -0.5, -0.5, SMOOTHING_ON);
+    sprite[8] = rotozoomSurface(sprite[1], 0, 0.5, SMOOTHING_ON);
 
     mainloop();
 
diff --git a/tests/sdl_rotozoom.png b/tests/sdl_rotozoom.png
index 5c5dec2f..288dd303 100644
--- a/tests/sdl_rotozoom.png
+++ b/tests/sdl_rotozoom.png