unit.h

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/*
 * This file is part of LibCSS.
 * Licensed under the MIT License,
 *                http://www.opensource.org/licenses/mit-license.php
 * Copyright 2008 John-Mark Bell <jmb@netsurf-browser.org>
 */
 
#ifndef libcss_unit_h_
#define libcss_unit_h_
 
#ifdef __cplusplus
extern "C"
{
#endif
 
#include <libcss/types.h>
 
typedef css_fixed (*css_unit_len_measure)(
                void *pw,
                const css_computed_style *style,
                const css_unit unit);
 
typedef struct css_unit_ctx {
        css_fixed viewport_width;
        css_fixed viewport_height;
        css_fixed font_size_default;
        css_fixed font_size_minimum;
        css_fixed device_dpi;
        const css_computed_style *root_style;
        void *pw;
        const css_unit_len_measure measure;
} css_unit_ctx;
 
static inline css_fixed css_unit_css2device_px(
                const css_fixed css_pixels,
                const css_fixed device_dpi)
{
        return FDIV(FMUL(css_pixels, device_dpi), F_96);
}
 
static inline css_fixed css_unit_device2css_px(
                const css_fixed device_pixels,
                const css_fixed device_dpi)
{
        return FDIV(FMUL(device_pixels, F_96), device_dpi);
}
 
css_fixed css_unit_font_size_len2pt(
                const css_computed_style *style,
                const css_unit_ctx *ctx,
                const css_fixed length,
                const css_unit unit);
 
css_fixed css_unit_len2css_px(
                const css_computed_style *style,
                const css_unit_ctx *ctx,
                const css_fixed length,
                const css_unit unit);
 
css_fixed css_unit_len2device_px(
                const css_computed_style *style,
                const css_unit_ctx *ctx,
                const css_fixed length,
                const css_unit unit);
 
#ifdef __cplusplus
}
#endif
 
#endif