static void layout_flow(fz_context *ctx, fz_html *box, fz_html *top, float em, float page_h)
{
fz_html_flow *node, *line, *mark;
float line_w;
float indent;
int align;
int line_align;
em = fz_from_css_number(box->style.font_size, em, em);
indent = box->is_first_flow ? fz_from_css_number(top->style.text_indent, em, top->w) : 0;
align = top->style.text_align;
if (box->flow_dir == BIDI_RIGHT_TO_LEFT)
{
if (align == TA_LEFT)
align = TA_RIGHT;
else if (align == TA_RIGHT)
align = TA_LEFT;
}
box->x = top->x;
box->y = top->y + top->h;
box->w = top->w;
box->h = 0;
if (!box->flow_head)
return;
for (node = box->flow_head; node; node = node->next)
{
if (node->type == FLOW_IMAGE)
{
float w = 0, h = 0;
find_accumulated_margins(ctx, box, &w, &h);
measure_image(ctx, node, top->w - w, page_h - h);
}
else
{
measure_word(ctx, node, em);
}
}
/* start by skipping whitespace (and newline) at the beginning of tags */
node = box->flow_head;
if (node->type == FLOW_BREAK)
node = node->next;
while (node && node->type == FLOW_GLUE)
node = node->next;
mark = NULL;
line = node;
line_w = indent;
while (node)
{
switch (node->type)
{
case FLOW_WORD:
break;
case FLOW_IMAGE:
/* TODO: break before/after image */
mark = node;
break;
case FLOW_GLUE:
mark = node;
break;
case FLOW_BREAK:
line_align = align == TA_JUSTIFY ? TA_LEFT : align;
flush_line(ctx, box, page_h, top->w, line_align, indent, line, node);
indent = 0;
line = node->next;
line_w = 0;
mark = NULL;
break;
}
if (mark && line_w + node->w > top->w)
{
flush_line(ctx, box, page_h, top->w, align, indent, line, mark);
indent = 0;
node = mark;
while (node && node->type == FLOW_GLUE)
node = node->next;
line = node;
line_w = 0;
mark = NULL;
}
if (node)
{
line_w += node->w;
node = node->next;
}
}
if (line)
{
line_align = align == TA_JUSTIFY ? TA_LEFT : align;
flush_line(ctx, box, page_h, top->w, line_align, indent, line, NULL);
}
}
static void layout_flow(fz_context *ctx, fz_html *box, fz_html *top, float em, float page_h)
{
fz_html_flow *node, *line_start, *word_start, *word_end, *line_end;
float glue_w;
float word_w;
float line_w;
float indent;
float avail, line_h;
float baseline;
int align;
em = fz_from_css_number(box->style.font_size, em, em);
indent = box->is_first_flow ? fz_from_css_number(top->style.text_indent, em, top->w) : 0;
align = top->style.text_align;
box->x = top->x;
box->y = top->y + top->h;
box->w = top->w;
box->h = 0;
if (!box->flow_head)
return;
for (node = box->flow_head; node; node = node->next)
if (node->type == FLOW_IMAGE)
measure_image(ctx, node, top->w, page_h);
else
measure_word(ctx, node, em);
line_start = find_next_word(box->flow_head, &glue_w);
line_end = NULL;
line_w = indent;
word_w = 0;
word_start = line_start;
while (word_start)
{
word_end = find_next_glue(word_start, &word_w);
if (line_w + word_w <= top->w)
{
line_w += word_w;
glue_w = 0;
line_end = word_end;
word_start = find_next_word(word_end, &glue_w);
word_w = glue_w;
}
else
{
avail = page_h - fmodf(box->y + box->h, page_h);
line_h = measure_line(line_start, line_end, &baseline);
if (line_h > avail)
box->h += avail;
layout_line(ctx, indent, top->w, line_w, align, line_start, line_end, box, baseline);
box->h += line_h;
word_start = find_next_word(line_end, &glue_w);
line_start = word_start;
line_end = NULL;
indent = 0;
line_w = 0;
word_w = 0;
}
}
/* don't justify the last line of a paragraph */
if (align == TA_JUSTIFY)
align = TA_LEFT;
if (line_start)
{
avail = page_h - fmodf(box->y + box->h, page_h);
line_h = measure_line(line_start, line_end, &baseline);
if (line_h > avail)
box->h += avail;
layout_line(ctx, indent, top->w, line_w, align, line_start, line_end, box, baseline);
box->h += line_h;
}
}
