Bugfix - GLImageObject.getDataResolution was returning bad resolution values.

fsl/fsleyes/gl/globject.py

@@ -388,14 +388,15 @@ class GLImageObject(GLObject):
 
             pixdim = np.array(image.pixdim[:3])
             steps  = [res, res, res] / pixdim
+            steps  = np.maximum(steps, [1, 1, 1])
             res    = image.shape[:3] / steps
             
             return np.array(res.round(), dtype=np.uint32)
         
         else:
             lo, hi = map(np.array, self.getDisplayBounds())
-            minres = int(round(((hi - lo) / res).min()))
-            return [minres] * 3
+            maxres = int(round(((hi - lo) / res).max()))
+            return [maxres] * 3
 
         
     def generateVertices(self, zpos, xform):

fsl/fsleyes/gl/textures/rendertexture.py

@@ -382,7 +382,6 @@ class GLObjectRenderTexture(RenderTexture):
                 (width, height)))
 
         if width > maxRes or height > maxRes:
-            oldWidth, oldHeight = width, height
             ratio = min(width, height) / float(max(width, height))
 
             if width > height:
@@ -395,12 +394,7 @@ class GLObjectRenderTexture(RenderTexture):
             width  = int(round(width))
             height = int(round(height))
 
-            log.debug('Limiting texture resolution to {}x{} '
-                      '(for {} resolution {}x{})'.format(
-                          width,
-                          height,
-                          type(globj).__name__,
-                          oldWidth,
-                          oldHeight))
+        log.debug('Setting {} texture resolution to {}x{}'.format(
+            type(globj).__name__, width, height))
 
         RenderTexture.setSize(self, width, height)