From ffc199d778c7666edca028da965009574fdfd3df Mon Sep 17 00:00:00 2001 From: Michael Drake Date: Mon, 6 May 2019 21:22:55 +0100 Subject: CSS: Add helpers to convert between css and physical pixels. --- content/handlers/css/utils.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/content/handlers/css/utils.h b/content/handlers/css/utils.h index 0e723f7f1..e35a6605b 100644 --- a/content/handlers/css/utils.h +++ b/content/handlers/css/utils.h @@ -79,6 +79,31 @@ css_fixed nscss_len2px( css_unit unit, const css_computed_style *style); +/** + * Convert css pixels to physical pixels. + * + * \param[in] css_pixels Length in css pixels. + * \return length in physical pixels + */ +static inline css_fixed nscss_pixels_css_to_physical( + css_fixed css_pixels) +{ + return FDIV(FMUL(css_pixels, nscss_screen_dpi), + nscss_baseline_pixel_density); +} + +/** + * Convert physical pixels to css pixels. + * + * \param[in] physical_pixels Length in physical pixels. + * \return length in css pixels + */ +static inline css_fixed nscss_pixels_physical_to_css( + css_fixed physical_pixels) +{ + return FDIV(FMUL(physical_pixels, nscss_baseline_pixel_density), + nscss_screen_dpi); +} /** * Temporary helper wrappers for for libcss computed style getter, while -- cgit v1.2.3