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[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
This commit is contained in:
Daniel Silverstone 2006-03-09 19:04:13 +00:00
parent 4b3d4f97a8
commit 05b214a5d5
2 changed files with 30 additions and 0 deletions
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28
css/css.c
View File

@ -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.

2
css/css.h
View File

@ -656,6 +656,8 @@ void css_dump_stylesheet(const struct css_stylesheet * stylesheet);
float css_len2px(const struct css_length *length,
const struct css_style *style);
float css_len2pt(const struct css_length *length,
const struct css_style *style);
struct css_border *css_eyecatching_border(struct css_border *test1,
struct css_style *style1, struct css_border *test2,
struct css_style *style2);