+
+ // because the above setImageOrientation call doesn't work... nor can I get an external imagemagick binary to do this either...
+ // hacking this for now (only works if you have exiv2 installed, a program to read and manipulate exif)
+ if ( $wgExiv2Command ) {
+ $cmd = wfEscapeShellArg( $wgExiv2Command )
+ . " -M "
+ . wfEscapeShellArg( "set Exif.Image.Orientation " . $orientation['exifCode'] )
+ . " "
+ . wfEscapeShellArg( $filename );
+
+ $retval = 0;
+ $err = wfShellExec( $cmd, $retval );
+ if ( $retval !== 0 ) {
+ print "Error with $cmd: $retval, $err\n";
+ }
+ }
+ }
+
+ /**
+ * Given an image specification, produce rotated version
+ * This is used when simulating a rotated image capture with EXIF orientation
+ * @param $spec Object returned by getImageSpec
+ * @param $matrix 2x2 transformation matrix
+ * @return transformed Spec
+ */
+ private static function rotateImageSpec( &$spec, $matrix ) {
+ $tSpec = array();
+ $dims = self::matrixMultiply2x2( $matrix, $spec['width'], $spec['height'] );
+ $correctionX = 0;
+ $correctionY = 0;
+ if ( $dims['x'] < 0 ) {
+ $correctionX = abs( $dims['x'] );
+ }
+ if ( $dims['y'] < 0 ) {
+ $correctionY = abs( $dims['y'] );
+ }
+ $tSpec['width'] = abs( $dims['x'] );
+ $tSpec['height'] = abs( $dims['y'] );
+ $tSpec['fill'] = $spec['fill'];
+ $tSpec['draws'] = array();
+ foreach( $spec['draws'] as $draw ) {
+ $tDraw = array(
+ 'fill' => $draw['fill'],
+ 'shape' => array()
+ );
+ foreach( $draw['shape'] as $point ) {
+ $tPoint = self::matrixMultiply2x2( $matrix, $point['x'], $point['y'] );
+ $tPoint['x'] += $correctionX;
+ $tPoint['y'] += $correctionY;
+ $tDraw['shape'][] = $tPoint;
+ }
+ $tSpec['draws'][] = $tDraw;
+ }
+ return $tSpec;
+ }
+
+ /**
+ * Given a matrix and a pair of images, return new position
+ * @param $matrix: 2x2 rotation matrix
+ * @param $x: x-coordinate number
+ * @param $y: y-coordinate number
+ * @return Array transformed with properties x, y
+ */
+ private static function matrixMultiply2x2( $matrix, $x, $y ) {
+ return array(
+ 'x' => $x * $matrix[0][0] + $y * $matrix[0][1],
+ 'y' => $x * $matrix[1][0] + $y * $matrix[1][1]
+ );