litehtml-sys 0.2.4

Raw FFI bindings for litehtml (C++ HTML/CSS rendering engine)
Documentation 
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#include "render_image.h"
#include "document.h"
#include "types.h"

litehtml::pixel_t litehtml::render_item_image::_render(pixel_t x, pixel_t y, const containing_block_context &containing_block_size, formatting_context* /*fmt_ctx*/, bool /*second_pass*/)
{
    pixel_t parent_width = containing_block_size.width;
	containing_block_context self_size = calculate_containing_block_context(containing_block_size);

    calc_outlines(parent_width);

    m_pos.move_to(x, y);

    document::ptr doc = src_el()->get_document();

    litehtml::size sz;
    src_el()->get_content_size(sz, containing_block_size.width);

    m_pos.width		= sz.width;
    m_pos.height	= sz.height;

    src_el()->css_w().line_height_w().computed_value = height();

    if(src_el()->css().get_height().is_predefined() && src_el()->css().get_width().is_predefined())
    {
        m_pos.height	= sz.height;
        m_pos.width		= sz.width;

        // check for max-width
        if(!src_el()->css().get_max_width().is_predefined())
        {
            pixel_t max_width = doc->to_pixels(css().get_max_width(), css().get_font_metrics(), parent_width);
            if(m_pos.width > max_width)
            {
                m_pos.width = max_width;
            }
            if(sz.width != 0)
            {
                m_pos.height = m_pos.width * sz.height / sz.width;
            } else
            {
                m_pos.height = sz.height;
            }
        }

        // check for max-height
        if(!src_el()->css().get_max_height().is_predefined())
        {
            pixel_t max_height = calc_max_height(sz.height, containing_block_size.height);
            if(m_pos.height > max_height)
            {
                m_pos.height = max_height;
            }
            if(sz.height != 0)
            {
                m_pos.width = m_pos.height * sz.width / sz.height;
            } else
            {
                m_pos.width = sz.width;
            }
        }
    } else if(!src_el()->css().get_height().is_predefined() && src_el()->css().get_width().is_predefined())
    {
		if(self_size.height.type != containing_block_context::cbc_value_type_auto && self_size.height > 0)
		{
			m_pos.height = self_size.height;
		}

        // check for max-height
        if(!src_el()->css().get_max_height().is_predefined())
        {
            pixel_t max_height = calc_max_height(sz.height, containing_block_size.height);
            if(m_pos.height > max_height)
            {
                m_pos.height = max_height;
            }
        }

        if(sz.height != 0)
        {
            m_pos.width = m_pos.height * sz.width / sz.height;
        } else
        {
            m_pos.width = sz.width;
        }
    } else if(src_el()->css().get_height().is_predefined() && !src_el()->css().get_width().is_predefined())
    {
        m_pos.width = src_el()->css().get_width().calc_percent(parent_width);

        // check for max-width
        if(!src_el()->css().get_max_width().is_predefined())
        {
            pixel_t max_width = doc->to_pixels(css().get_max_width(), css().get_font_metrics(), parent_width);
            if(m_pos.width > max_width)
            {
                m_pos.width = max_width;
            }
        }

        if(sz.width != 0)
        {
            m_pos.height = m_pos.width * sz.height / sz.width;
        } else
        {
            m_pos.height = sz.height;
        }
    } else
    {
        m_pos.width		= src_el()->css().get_width().calc_percent(parent_width);
        m_pos.height	= 0;
		if(self_size.height.type != containing_block_context::cbc_value_type_auto && self_size.height > 0)
		{
			m_pos.height = self_size.height;
		}

        // check for max-height
        if(!src_el()->css().get_max_height().is_predefined())
        {
            pixel_t max_height = calc_max_height(sz.height, containing_block_size.height);
            if(m_pos.height > max_height)
            {
                m_pos.height = max_height;
            }
        }

        // check for max-height
        if(!src_el()->css().get_max_width().is_predefined())
        {
            pixel_t max_width = doc->to_pixels(css().get_max_width(), css().get_font_metrics(), parent_width);
            if(m_pos.width > max_width)
            {
                m_pos.width = max_width;
            }
        }
    }

    m_pos.x	+= content_offset_left();
    m_pos.y += content_offset_top();

    return m_pos.width + content_offset_left() + content_offset_right();
}

litehtml::pixel_t litehtml::render_item_image::calc_max_height(pixel_t image_height, pixel_t containing_block_height)
{
    document::ptr doc = src_el()->get_document();
    return doc->to_pixels(css().get_max_height(), css().get_font_metrics(),
						  containing_block_height == 0 ? image_height : containing_block_height);
}