static float layout_block(fz_context *ctx, fz_html *box, fz_html *top, float em, float page_h, float vertical)
{
fz_html *child;
int first;
fz_css_style *style = &box->style;
float *margin = box->margin;
float *border = box->border;
float *padding = box->padding;
em = box->em = fz_from_css_number(style->font_size, em, em);
margin[0] = fz_from_css_number(style->margin[0], em, top->w);
margin[1] = fz_from_css_number(style->margin[1], em, top->w);
margin[2] = fz_from_css_number(style->margin[2], em, top->w);
margin[3] = fz_from_css_number(style->margin[3], em, top->w);
padding[0] = fz_from_css_number(style->padding[0], em, top->w);
padding[1] = fz_from_css_number(style->padding[1], em, top->w);
padding[2] = fz_from_css_number(style->padding[2], em, top->w);
padding[3] = fz_from_css_number(style->padding[3], em, top->w);
border[0] = style->border_style[0] ? fz_from_css_number(style->border_width[0], em, top->w) : 0;
border[1] = style->border_style[1] ? fz_from_css_number(style->border_width[1], em, top->w) : 0;
border[2] = style->border_style[2] ? fz_from_css_number(style->border_width[2], em, top->w) : 0;
border[3] = style->border_style[3] ? fz_from_css_number(style->border_width[3], em, top->w) : 0;
box->x = top->x + margin[L] + border[L] + padding[L];
box->w = top->w - (margin[L] + margin[R] + border[L] + border[R] + padding[L] + padding[R]);
if (margin[T] > vertical)
margin[T] -= vertical;
else
margin[T] = 0;
if (padding[T] == 0 && border[T] == 0)
vertical += margin[T];
else
vertical = 0;
box->y = top->y + top->h + margin[T] + border[T] + padding[T];
box->h = 0;
first = 1;
for (child = box->down; child; child = child->next)
{
if (child->type == BOX_BLOCK)
{
vertical = layout_block(ctx, child, box, em, page_h, vertical);
if (first)
{
/* move collapsed parent/child top margins to parent */
margin[T] += child->margin[T];
box->y += child->margin[T];
child->margin[T] = 0;
first = 0;
}
box->h += child->h +
child->padding[T] + child->padding[B] +
child->border[T] + child->border[B] +
child->margin[T] + child->margin[B];
}
else if (child->type == BOX_BREAK)
{
box->h += fz_from_css_number_scale(style->line_height, em, em, em);
vertical = 0;
first = 0;
}
else if (child->type == BOX_FLOW)
{
layout_flow(ctx, child, box, em, page_h);
if (child->h > 0)
{
box->h += child->h;
vertical = 0;
first = 0;
}
}
}
/* reserve space for the list mark */
if (box->list_item && box->h == 0)
{
box->h += fz_from_css_number_scale(style->line_height, em, em, em);
vertical = 0;
}
if (box->h == 0)
{
if (margin[B] > vertical)
margin[B] -= vertical;
else
margin[B] = 0;
}
else
{
box->h -= vertical;
vertical = fz_max(margin[B], vertical);
margin[B] = vertical;
}
return vertical;
}
static void layout_block(fz_context *ctx, fz_html *box, fz_html *top, float em, float top_collapse_margin, float page_h)
{
fz_html *child;
float box_collapse_margin;
int prev_br;
float *margin = box->margin;
float *border = box->border;
float *padding = box->padding;
em = fz_from_css_number(box->style.font_size, em, em);
margin[0] = fz_from_css_number(box->style.margin[0], em, top->w);
margin[1] = fz_from_css_number(box->style.margin[1], em, top->w);
margin[2] = fz_from_css_number(box->style.margin[2], em, top->w);
margin[3] = fz_from_css_number(box->style.margin[3], em, top->w);
padding[0] = fz_from_css_number(box->style.padding[0], em, top->w);
padding[1] = fz_from_css_number(box->style.padding[1], em, top->w);
padding[2] = fz_from_css_number(box->style.padding[2], em, top->w);
padding[3] = fz_from_css_number(box->style.padding[3], em, top->w);
if (box->style.border_style)
{
border[0] = fz_from_css_number(box->style.border_width[0], em, top->w);
border[1] = fz_from_css_number(box->style.border_width[1], em, top->w);
border[2] = fz_from_css_number(box->style.border_width[2], em, top->w);
border[3] = fz_from_css_number(box->style.border_width[3], em, top->w);
}
else
border[0] = border[1] = border[2] = border[3] = 0;
if (padding[T] == 0 && border[T] == 0)
box_collapse_margin = margin[T];
else
box_collapse_margin = 0;
if (margin[T] > top_collapse_margin)
margin[T] -= top_collapse_margin;
else
margin[T] = 0;
box->x = top->x + margin[L] + border[L] + padding[L];
box->y = top->y + top->h + margin[T] + border[T] + padding[T];
box->w = top->w - (margin[L] + margin[R] + border[L] + border[R] + padding[L] + padding[R]);
box->h = 0;
prev_br = 0;
for (child = box->down; child; child = child->next)
{
if (child->type == BOX_BLOCK)
{
layout_block(ctx, child, box, em, box_collapse_margin, page_h);
box->h += child->h +
child->padding[T] + child->padding[B] +
child->border[T] + child->border[B] +
child->margin[T] + child->margin[B];
box_collapse_margin = child->margin[B];
prev_br = 0;
}
else if (child->type == BOX_BREAK)
{
/* TODO: interaction with page breaks */
if (prev_br)
box->h += fz_from_css_number_scale(box->style.line_height, em, em, em);
prev_br = 1;
}
else if (child->type == BOX_FLOW)
{
layout_flow(ctx, child, box, em, page_h);
if (child->h > 0)
{
box->h += child->h;
box_collapse_margin = 0;
prev_br = 0;
}
}
}
if (padding[B] == 0 && border[B] == 0)
{
if (margin[B] > 0)
{
box->h -= box_collapse_margin;
if (margin[B] < box_collapse_margin)
margin[B] = box_collapse_margin;
}
}
}