Changeset 15334

Timestamp:

Oct 18, 2007, 3:28:21 PM (19 years ago)

Author:

Paul Price

Message:

Attempting to fix apparent half-pixel errors in warping sources.

File:

• trunk/pswarp/src/pswarpTransformReadout_Opt.c (modified) (2 diffs)

trunk/pswarp/src/pswarpTransformReadout_Opt.c

@@ -179 +179 @@
             pswarpMap *map = sourceGrid->maps[xGrid][yGrid]; // Locally linear transformation
             double xOut, yOut;          // Output coordinates
-            if (!pswarpMapApply(&xOut, &yOut, map, xIn, yIn)) {
+            if (!pswarpMapApply(&xOut, &yOut, map, xIn + 0.5, yIn + 0.5)) {
                 psError(PS_ERR_UNKNOWN, false, "Unable to transform coordinates for source at %f,%f\n",
                         xIn, yIn);
@@ -186 +186 @@
                 return false;
             }
-            xOut += outCol0;
-            yOut += outRow0;
+            xOut += outCol0 - 0.5;
+            yOut += outRow0 - 0.5;
             if (xOut < minX || xOut > maxX || yOut < minY || yOut > maxY) {
                 // It's not in the output image