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author | Michael Drake <michael.drake@codethink.co.uk> | 2019-05-06 21:22:55 +0100 |
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committer | Michael Drake <michael.drake@codethink.co.uk> | 2019-05-06 21:22:55 +0100 |
commit | ffc199d778c7666edca028da965009574fdfd3df (patch) | |
tree | 75bb8585fc39a574aadc44535eed6d37aa9a5b38 /content/handlers/css | |
parent | 7567f6407512acb44199a11b6496a614ca659fe2 (diff) | |
download | netsurf-ffc199d778c7666edca028da965009574fdfd3df.tar.gz netsurf-ffc199d778c7666edca028da965009574fdfd3df.tar.bz2 |
CSS: Add helpers to convert between css and physical pixels.
Diffstat (limited to 'content/handlers/css')
-rw-r--r-- | content/handlers/css/utils.h | 25 |
1 files changed, 25 insertions, 0 deletions
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 |