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author | Daniel Silverstone <dsilvers@netsurf-browser.org> | 2006-03-09 19:04:13 +0000 |
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committer | Daniel Silverstone <dsilvers@netsurf-browser.org> | 2006-03-09 19:04:13 +0000 |
commit | 05b214a5d5f8ce4a3058f178e3cf9a5a9b56c770 (patch) | |
tree | 30c6fd8bbc8e73387d07a9021875843d2c1e52f7 /css/css.c | |
parent | 4b3d4f97a8955ee72077623662ab4b5e045f6647 (diff) | |
download | netsurf-05b214a5d5f8ce4a3058f178e3cf9a5a9b56c770.tar.gz netsurf-05b214a5d5f8ce4a3058f178e3cf9a5a9b56c770.tar.bz2 |
[project @ 2006-03-09 19:04:13 by dsilvers]
css.[ch]: Add css_len2pt to convert a CSS length to points for use on systems
which actually recognise that DPI might not be 90 all the time.
svn path=/import/netsurf/; revision=2114
Diffstat (limited to 'css/css.c')
-rw-r--r-- | css/css.c | 28 |
1 files changed, 28 insertions, 0 deletions
@@ -2976,6 +2976,8 @@ unsigned int css_hash(const char *s, int length) /** * Convert a struct css_length to pixels. + * + * Note: This assumes 90dpi (if converting from points) */ float css_len2px(const struct css_length *length, @@ -2999,6 +3001,32 @@ float css_len2px(const struct css_length *length, return 0; } +/** + * Convert a struct css_length to points. + * + * Note: This assumes 90dpi (if converting a pixel size) + */ + +float css_len2pt(const struct css_length *length, + const struct css_style *style) +{ + assert(!((length->unit == CSS_UNIT_EM || length->unit == CSS_UNIT_EX) && style == 0)); + switch (length->unit) { + case CSS_UNIT_EM: return length->value * css_len2pt(&style->font_size.value.length, 0); + case CSS_UNIT_EX: return length->value * css_len2pt(&style->font_size.value.length, 0) * 0.6; + /* RISC OS assumes 90dpi */ + case CSS_UNIT_PX: return length->value / 1.25; + /* 1pt = 1in/72 */ + case CSS_UNIT_IN: return length->value * 72; + case CSS_UNIT_CM: return length->value * 28.452756; + case CSS_UNIT_MM: return length->value * 2.8452756; + case CSS_UNIT_PT: return length->value; + /* 1pc = 1pt * 12 */ + case CSS_UNIT_PC: return length->value * 12.0; + default: break; + } + return 0; +} /** * Return the most 'eyecatching' border. |