diff options
| -rw-r--r-- | src/backends/native/meta-kms-utils.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/src/backends/native/meta-kms-utils.c b/src/backends/native/meta-kms-utils.c index 11df09be8..1c58db83d 100644 --- a/src/backends/native/meta-kms-utils.c +++ b/src/backends/native/meta-kms-utils.c @@ -33,19 +33,18 @@ float meta_calculate_drm_mode_refresh_rate (const drmModeModeInfo *drm_mode) { - float refresh = 0.0; + double numerator; + double denominator; - if (drm_mode->htotal > 0 && drm_mode->vtotal > 0) - { - /* Calculate refresh rate in milliHz first for extra precision. */ - refresh = (drm_mode->clock * 1000000LL) / drm_mode->htotal; - refresh += (drm_mode->vtotal / 2); - refresh /= drm_mode->vtotal; - if (drm_mode->vscan > 1) - refresh /= drm_mode->vscan; - refresh /= 1000.0; - } - return refresh; + if (drm_mode->htotal <= 0 || drm_mode->vtotal <= 0) + return 0.0; + + numerator = drm_mode->clock * 1000.0; + denominator = (double) drm_mode->vtotal * drm_mode->htotal; + if (drm_mode->vscan > 1) + denominator *= drm_mode->vscan; + + return numerator / denominator; } /** |