static void measure_word(fz_context *ctx, fz_html_flow *node, float em)
{
const char *s;
int c, g;
float w;
em = fz_from_css_number(node->style->font_size, em, em);
node->x = 0;
node->y = 0;
node->h = fz_from_css_number_scale(node->style->line_height, em, em, em);
w = 0;
s = node->text;
while (*s)
{
s += fz_chartorune(&c, s);
g = fz_encode_character(ctx, node->style->font, c);
if (g)
{
w += fz_advance_glyph(ctx, node->style->font, g) * em;
}
else
{
g = fz_encode_character(ctx, node->style->fallback, c);
w += fz_advance_glyph(ctx, node->style->fallback, g) * em;
}
}
node->w = w;
node->em = em;
}
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 draw_list_mark(fz_context *ctx, fz_html *box, float page_top, float page_bot, fz_device *dev, const fz_matrix *ctm, int n)
{
fz_font *font;
fz_text *text;
fz_matrix trm;
fz_html_flow *line;
float y, w;
float color[3];
const char *s;
char buf[40];
int c, g;
fz_scale(&trm, box->em, -box->em);
text = fz_new_text(ctx);
line = find_list_mark_anchor(ctx, box);
if (line)
{
y = line->y;
}
else
{
float h = fz_from_css_number_scale(box->style.line_height, box->em, box->em, box->em);
float a = box->em * 0.8;
float d = box->em * 0.2;
if (a + d > h)
h = a + d;
y = box->y + a + (h - a - d) / 2;
}
if (y > page_bot || y < page_top)
return;
format_list_number(ctx, box->style.list_style_type, n, buf, sizeof buf);
s = buf;
w = 0;
while (*s)
{
s += fz_chartorune(&c, s);
g = fz_encode_character_with_fallback(ctx, box->style.font, c, UCDN_SCRIPT_LATIN, &font);
w += fz_advance_glyph(ctx, font, g) * box->em;
}
s = buf;
trm.e = box->x - w;
trm.f = y;
while (*s)
{
s += fz_chartorune(&c, s);
g = fz_encode_character_with_fallback(ctx, box->style.font, c, UCDN_SCRIPT_LATIN, &font);
fz_add_text(ctx, text, font, 0, &trm, g, c);
trm.e += fz_advance_glyph(ctx, font, g) * box->em;
}
color[0] = box->style.color.r / 255.0f;
color[1] = box->style.color.g / 255.0f;
color[2] = box->style.color.b / 255.0f;
fz_fill_text(ctx, dev, text, ctm, fz_device_rgb(ctx), color, 1);
fz_drop_text(ctx, text);
}
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;
}
}
}
