diff options
Diffstat (limited to 'editor/pnmrotate.c')
| -rw-r--r-- | editor/pnmrotate.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/editor/pnmrotate.c b/editor/pnmrotate.c index 64c69e2a..ba817c17 100644 --- a/editor/pnmrotate.c +++ b/editor/pnmrotate.c @@ -159,6 +159,27 @@ computeNewFormat(bool const antialias, +static bool +isWhite(xel const color, + xelval const maxval) { + + return (PPM_GETR(color) == maxval && + PPM_GETG(color) == maxval && + PPM_GETB(color) == maxval); +} + + + +static bool +isBlack(xel const color) { + + return (PPM_GETR(color) == 0 && + PPM_GETG(color) == 0 && + PPM_GETB(color) == 0); +} + + + static xel backgroundColor(const char * const backgroundColorName, xel * const topRow, @@ -180,8 +201,7 @@ backgroundColor(const char * const backgroundColorName, break; case PBM_TYPE: - if (!PNM_EQUAL(retval, pnm_whitexel(maxval, format)) && - !PNM_EQUAL(retval, pnm_blackxel(maxval, format))) + if (!isWhite(retval, maxval) && !isBlack(retval)) pm_error("Image is PBM (black and white), " "but you specified '%s', which is neither black " "nor white, as background color", |