gdImageWBMP has some bug in it. Using the php-internal one works.

diff --git a/ext/gd/gd.c b/ext/gd/gd.c
index 8da5c6435a633baded60aa199e2718564ad0a924..9cbb0a9f0d241b253280436497ee7db97cb88dd5 100644 (file)
--- a/ext/gd/gd.c
+++ b/ext/gd/gd.c
@@ -750,11 +750,7 @@ PHP_FUNCTION(imagejpeg)
    Output WBMP image to browser or file */
 PHP_FUNCTION(imagewbmp)
 {
-#ifdef HAVE_GD_WBMP
-       _php_image_output(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_GDIMG_TYPE_WBM, "WBMP", gdImageWBMP);
-#else
        _php_image_output(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_GDIMG_TYPE_WBM, "WBMP", _php_image_output_wbmp);
-#endif
 }
 /* }}} */