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CSS: Add helpers to convert between css and physical pixels.

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This commit is contained in:
Michael Drake 2019-05-06 21:22:55 +01:00
parent 7567f64075
commit ffc199d778
1 changed files with 25 additions and 0 deletions
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25
content/handlers/css/utils.h
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@ -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