Merge branch 'fix-rotozoom' of github.com:fhd/emscripten into incoming

Author: kripken

src/library_sdl.js

@@ -1122,7 +1122,7 @@ var LibrarySDL = {
     var ret = SDL.makeSurface(diagonal, diagonal, srcData.flags, false, 'rotozoomSurface');
     var dstData = SDL.surfaces[ret];
     dstData.ctx.translate(diagonal / 2, diagonal / 2);
-    dstData.ctx.rotate(angle * Math.PI / 180);
+    dstData.ctx.rotate(-angle * Math.PI / 180);
     dstData.ctx.drawImage(srcData.canvas, -w / 2, -h / 2, w, h);
     return ret;
   },

tests/sdl_rotozoom.c

@@ -38,7 +38,7 @@ int main(int argc, char **argv) {
     sprite[2] = zoomSurface(sprite[0], 0.5, 0.5, SMOOTHING_ON);
     sprite[3] = zoomSurface(sprite[1], 0.5, 0.5, SMOOTHING_ON);
     sprite[4] = rotozoomSurface(sprite[0], -20, 0.3, SMOOTHING_ON);
-    sprite[5] = rotozoomSurface(sprite[1], 45, 0.5, SMOOTHING_ON);
+    sprite[5] = rotozoomSurface(sprite[1], 20, 1, 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);

tests/sdl_rotozoom.png

@@ -1389,7 +1389,7 @@ def test_sdl_maprgba(self):
 
   def test_sdl_rotozoom(self):
     shutil.copyfile(path_from_root('tests', 'screenshot.png'), os.path.join(self.get_dir(), 'screenshot.png'))
-    self.btest('sdl_rotozoom.c', reference='sdl_rotozoom.png', args=['--preload-file', 'screenshot.png'], reference_slack=5)
+    self.btest('sdl_rotozoom.c', reference='sdl_rotozoom.png', args=['--preload-file', 'screenshot.png'])
 
   def test_sdl_gfx_primitives(self):
     self.btest('sdl_gfx_primitives.c', reference='sdl_gfx_primitives.png', reference_slack=1)