diff options
Diffstat (limited to 'analyzer/pnmpsnr.c')
| -rw-r--r-- | analyzer/pnmpsnr.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/analyzer/pnmpsnr.c b/analyzer/pnmpsnr.c index 19f013a4..1ddefac2 100644 --- a/analyzer/pnmpsnr.c +++ b/analyzer/pnmpsnr.c @@ -2,7 +2,7 @@ * pnmpsnr.c: Compute error (RMSE, PSNR) between images * * - * Derived from pnmpnsmr by Ulrich Hafner, part of his fiasco package, + * Derived from pnmpnsmr by Ullrich Hafner, part of his fiasco package, * On 2001.03.04. * Copyright (C) 1994-2000 Ullrich Hafner <hafner@bigfoot.de> @@ -402,6 +402,21 @@ psnrFromSumSqDiff(struct SqDiff const sumSqDiff, +static bool +psnrIsFinite(double const psnr) { + + /* We would just use C standard isfinite(), but that is not standard + before C99. Neither is INFINITY. + + A finite PSNR, in this program, cannot be anywhere near 1,000,000, + because of limits of the program, so we just compare to that. + */ + + return psnr < 1000000.0; +} + + + static void reportPsnrHuman(struct Psnr const psnr, ColorSpace const colorSpace, @@ -417,7 +432,7 @@ reportPsnrHuman(struct Psnr const psnr, pm_asprintf(&label, "%s:", colorSpace.componentName[i]); - if (isfinite(psnr.psnr[i])) + if (psnrIsFinite(psnr.psnr[i])) pm_message(" %-6.6s %.2f dB", label, psnr.psnr[i]); else pm_message(" %-6.6s no difference", label); |