TextAsset::Size
TextAsset::computeSizeOfText(cairo_t* cairoContext,
const std::string textString,
int bounds,
PangoFontDescription* font,
Rect* tight,
float* lineHeightOut)
{
PangoLayout* layout = pango_cairo_create_layout(cairoContext);
// Kerning
PangoAttrList* attr_list = pango_attr_list_new();
PangoAttribute* spacing_attr = pango_attr_letter_spacing_new(pango_units_from_double(_kern));
pango_attr_list_insert(attr_list, spacing_attr);
pango_layout_set_attributes(layout, attr_list);
pango_cairo_context_set_resolution(pango_layout_get_context(layout), DISPLAY_RESOLUTION);
pango_layout_set_text(layout, textString.c_str(), (int)textString.length());
pango_layout_set_alignment(layout, _alignment);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
const Size maxTextureSize(bounds, 1024);
pango_layout_set_width(layout, pango_units_from_double(maxTextureSize.width));
pango_layout_set_height(layout, pango_units_from_double(maxTextureSize.height));
pango_layout_set_font_description(layout, font);
applyLeading(cairoContext, layout, font);
PangoRectangle estimateSize;
PangoRectangle ink;
pango_layout_get_pixel_extents(layout, &ink, &estimateSize);
// If the text is right or center aligned the offsets will contain all the
// leading space. We ignore that for the size because drawText will draw
// in the larger box. The tight box below will get the offsets so we know
// where to draw so the text lands in the same tight box.
Size res(estimateSize.width, estimateSize.height);
if (tight != NULL) {
float lineHeight;
float xHeight = charHeight(cairoContext, font, 'x', &lineHeight);
if (lineHeightOut != NULL) {
*lineHeightOut = lineHeight;
}
const float capHeight = charHeight(cairoContext, font, 'Y');
const float ascender = pango_units_to_double(pango_layout_get_baseline(layout));
const float topSpace = ascender - capHeight;
const float bottomSpace = MAX(lineHeight - ascender - (capHeight - xHeight), 0);
if (res.height > topSpace + bottomSpace) {
*tight = Rect(estimateSize.x,
estimateSize.y + topSpace,
res.width,
res.height - topSpace - bottomSpace);
} else {
*tight = Rect(0, 0, res.width, res.height);
}
}
g_object_unref(layout);
return res;
}
static void setPangoAttributes(const Font* font, const TextRun& run, PangoLayout* layout, bool rtl)
{
PangoAttrList* list = pango_attr_list_new();
PangoAttribute* attr;
attr = pango_attr_size_new_absolute((int)(font->size() * PANGO_SCALE));
attr->end_index = G_MAXUINT;
pango_attr_list_insert_before(list, attr);
attr = pango_attr_letter_spacing_new(font->letterSpacing() * PANGO_SCALE);
attr->end_index = G_MAXUINT;
pango_attr_list_insert_before(list, attr);
// Pango does not yet support synthesising small caps
// See http://bugs.webkit.org/show_bug.cgi?id=15610
pango_layout_set_attributes(layout, list);
pango_attr_list_unref(list);
pango_layout_set_auto_dir(layout, FALSE);
PangoContext* pangoContext = pango_layout_get_context(layout);
PangoDirection direction = rtl ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
pango_context_set_base_dir(pangoContext, direction);
}
void
TextAsset::drawText(cairo_t* cairoContext,
const std::string& textString,
const Rect& rect,
PangoFontDescription* inFontDescription,
bool outlineEnabled)
{
cairo_move_to(cairoContext, rect.x, rect.y);
PangoLayout* layout = pango_cairo_create_layout(cairoContext);
// Kerning
PangoAttrList* attr_list = pango_attr_list_new();
PangoAttribute* spacing_attr = pango_attr_letter_spacing_new(pango_units_from_double(_kern));
pango_attr_list_insert(attr_list, spacing_attr);
pango_layout_set_attributes(layout, attr_list);
pango_cairo_context_set_resolution(pango_layout_get_context(layout), DISPLAY_RESOLUTION);
pango_layout_set_text(layout, textString.c_str(), textString.length());
pango_layout_set_font_description(layout, inFontDescription);
pango_layout_set_wrap(layout, PANGO_WRAP_WORD_CHAR);
pango_layout_set_width(layout, pango_units_from_double(rect.size.width + WIDTH_PADDING));
pango_layout_set_height(layout, pango_units_from_double(rect.size.height + HEIGHT_PADDING));
pango_layout_set_alignment(layout, _alignment);
applyLeading(cairoContext, layout, inFontDescription);
pango_cairo_show_layout(cairoContext, layout);
// Core Text defines positive outline width values as stroke only
if (_outlineThickness <= 0.0f) {
cairo_fill_preserve(cairoContext);
}
// Outline
if (outlineEnabled && _outlineThickness != 0.0f) {
const float outlineThickness = (fabsf(_outlineThickness) / 100.0f) * _fontSize * CLIENT_TO_SERVER_SCALE;
cairo_set_source_rgba(cairoContext,
_outlineColor.red,
_outlineColor.green,
_outlineColor.blue,
_outlineColor.alpha);
pango_cairo_layout_path(cairoContext, layout);
cairo_set_line_width(cairoContext, outlineThickness);
cairo_stroke(cairoContext);
} else {
cairo_new_path(cairoContext);
}
g_object_unref(layout);
}
static void setPangoAttributes(const Font* font, const TextRun& run, PangoLayout* layout)
{
#if USE(FREETYPE)
if (font->primaryFont()->platformData().m_pattern) {
PangoFontDescription* desc = pango_fc_font_description_from_pattern(font->primaryFont()->platformData().m_pattern.get(), FALSE);
pango_layout_set_font_description(layout, desc);
pango_font_description_free(desc);
}
#elif USE(PANGO)
if (font->primaryFont()->platformData().m_font) {
PangoFontDescription* desc = pango_font_describe(font->primaryFont()->platformData().m_font);
pango_layout_set_font_description(layout, desc);
pango_font_description_free(desc);
}
#endif
pango_layout_set_auto_dir(layout, FALSE);
PangoContext* pangoContext = pango_layout_get_context(layout);
PangoDirection direction = run.rtl() ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
pango_context_set_base_dir(pangoContext, direction);
PangoAttrList* list = pango_attr_list_new();
PangoAttribute* attr;
attr = pango_attr_size_new_absolute(font->pixelSize() * PANGO_SCALE);
attr->end_index = G_MAXUINT;
pango_attr_list_insert_before(list, attr);
if (!run.spacingDisabled()) {
attr = pango_attr_letter_spacing_new(font->letterSpacing() * PANGO_SCALE);
attr->end_index = G_MAXUINT;
pango_attr_list_insert_before(list, attr);
}
// Pango does not yet support synthesising small caps
// See http://bugs.webkit.org/show_bug.cgi?id=15610
pango_layout_set_attributes(layout, list);
pango_attr_list_unref(list);
}
static PangoLayout *
rsvg_text_create_layout (RsvgDrawingCtx * ctx,
RsvgState * state, const char *text, PangoContext * context)
{
PangoFontDescription *font_desc;
PangoLayout *layout;
PangoAttrList *attr_list;
PangoAttribute *attribute;
if (state->lang)
pango_context_set_language (context, pango_language_from_string (state->lang));
if (state->unicode_bidi == UNICODE_BIDI_OVERRIDE || state->unicode_bidi == UNICODE_BIDI_EMBED)
pango_context_set_base_dir (context, state->text_dir);
font_desc = pango_font_description_copy (pango_context_get_font_description (context));
if (state->font_family)
pango_font_description_set_family_static (font_desc, state->font_family);
pango_font_description_set_style (font_desc, state->font_style);
pango_font_description_set_variant (font_desc, state->font_variant);
pango_font_description_set_weight (font_desc, state->font_weight);
pango_font_description_set_stretch (font_desc, state->font_stretch);
pango_font_description_set_size (font_desc,
_rsvg_css_normalize_font_size (state, ctx) *
PANGO_SCALE / ctx->dpi_y * 72);
layout = pango_layout_new (context);
pango_layout_set_font_description (layout, font_desc);
pango_font_description_free (font_desc);
attr_list = pango_attr_list_new ();
attribute = pango_attr_letter_spacing_new (_rsvg_css_normalize_length (&state->letter_spacing,
ctx, 'h') * PANGO_SCALE);
attribute->start_index = 0;
attribute->end_index = G_MAXINT;
pango_attr_list_insert (attr_list, attribute);
if (state->has_font_decor && text) {
if (state->font_decor & TEXT_UNDERLINE) {
attribute = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
attribute->start_index = 0;
attribute->end_index = -1;
pango_attr_list_insert (attr_list, attribute);
}
if (state->font_decor & TEXT_STRIKE) {
attribute = pango_attr_strikethrough_new (TRUE);
attribute->start_index = 0;
attribute->end_index = -1;
pango_attr_list_insert (attr_list, attribute);
}
}
pango_layout_set_attributes (layout, attr_list);
pango_attr_list_unref (attr_list);
if (text)
pango_layout_set_text (layout, text, -1);
else
pango_layout_set_text (layout, NULL, 0);
pango_layout_set_alignment (layout, (state->text_dir == PANGO_DIRECTION_LTR ||
state->text_dir == PANGO_DIRECTION_TTB_LTR) ?
PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT);
return layout;
}
static gboolean
span_parse_func (MarkupData *md,
OpenTag *tag,
const gchar **names,
const gchar **values,
GMarkupParseContext *context,
GError **error)
{
int line_number, char_number;
int i;
const char *family = NULL;
const char *size = NULL;
const char *style = NULL;
const char *weight = NULL;
const char *variant = NULL;
const char *stretch = NULL;
const char *desc = NULL;
const char *foreground = NULL;
const char *background = NULL;
const char *underline = NULL;
const char *underline_color = NULL;
const char *strikethrough = NULL;
const char *strikethrough_color = NULL;
const char *rise = NULL;
const char *letter_spacing = NULL;
const char *lang = NULL;
const char *fallback = NULL;
const char *gravity = NULL;
const char *gravity_hint = NULL;
g_markup_parse_context_get_position (context,
&line_number, &char_number);
#define CHECK_DUPLICATE(var) G_STMT_START{ \
if ((var) != NULL) { \
g_set_error (error, G_MARKUP_ERROR, \
G_MARKUP_ERROR_INVALID_CONTENT, \
_("Attribute '%s' occurs twice on <span> tag " \
"on line %d char %d, may only occur once"), \
names[i], line_number, char_number); \
return FALSE; \
}}G_STMT_END
#define CHECK_ATTRIBUTE2(var, name) \
if (attr_strcmp (names[i], (name)) == 0) { \
CHECK_DUPLICATE (var); \
(var) = values[i]; \
found = TRUE; \
break; \
}
#define CHECK_ATTRIBUTE(var) CHECK_ATTRIBUTE2 (var, G_STRINGIFY (var))
i = 0;
while (names[i])
{
gboolean found = FALSE;
switch (names[i][0]) {
case 'f':
CHECK_ATTRIBUTE (fallback);
CHECK_ATTRIBUTE2(desc, "font");
CHECK_ATTRIBUTE2(desc, "font_desc");
CHECK_ATTRIBUTE2(family, "face");
CHECK_ATTRIBUTE2(family, "font_family");
CHECK_ATTRIBUTE2(size, "font_size");
CHECK_ATTRIBUTE2(stretch, "font_stretch");
CHECK_ATTRIBUTE2(style, "font_style");
CHECK_ATTRIBUTE2(variant, "font_variant");
CHECK_ATTRIBUTE2(weight, "font_weight");
CHECK_ATTRIBUTE (foreground);
CHECK_ATTRIBUTE2 (foreground, "fgcolor");
break;
case 's':
CHECK_ATTRIBUTE (size);
CHECK_ATTRIBUTE (stretch);
CHECK_ATTRIBUTE (strikethrough);
CHECK_ATTRIBUTE (strikethrough_color);
CHECK_ATTRIBUTE (style);
break;
case 'g':
CHECK_ATTRIBUTE (gravity);
CHECK_ATTRIBUTE (gravity_hint);
break;
case 'l':
CHECK_ATTRIBUTE (lang);
CHECK_ATTRIBUTE (letter_spacing);
break;
case 'u':
CHECK_ATTRIBUTE (underline);
CHECK_ATTRIBUTE (underline_color);
break;
default:
CHECK_ATTRIBUTE (background);
CHECK_ATTRIBUTE2 (background, "bgcolor");
CHECK_ATTRIBUTE2(foreground, "color");
CHECK_ATTRIBUTE (rise);
CHECK_ATTRIBUTE (variant);
CHECK_ATTRIBUTE (weight);
break;
}
if (!found)
{
g_set_error (error, G_MARKUP_ERROR,
G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE,
_("Attribute '%s' is not allowed on the <span> tag "
"on line %d char %d"),
names[i], line_number, char_number);
return FALSE;
}
++i;
}
/* Parse desc first, then modify it with other font-related attributes. */
if (G_UNLIKELY (desc))
{
PangoFontDescription *parsed;
parsed = pango_font_description_from_string (desc);
if (parsed)
{
add_attribute (tag, pango_attr_font_desc_new (parsed));
if (tag)
open_tag_set_absolute_font_size (tag, pango_font_description_get_size (parsed));
pango_font_description_free (parsed);
}
}
if (G_UNLIKELY (family))
{
add_attribute (tag, pango_attr_family_new (family));
}
if (G_UNLIKELY (size))
{
if (g_ascii_isdigit (*size))
{
const char *end;
gint n;
/* cap size from the top at an arbitrary 2048 */
#define MAX_SIZE (2048 * PANGO_SCALE)
if ((end = size, !pango_scan_int (&end, &n)) || *end != '\0' || n < 0 || n > MAX_SIZE)
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_INVALID_CONTENT,
_("Value of 'size' attribute on <span> tag on line %d "
"could not be parsed; should be an integer less than %d, or a "
"string such as 'small', not '%s'"),
line_number, MAX_SIZE+1, size);
goto error;
}
add_attribute (tag, pango_attr_size_new (n));
if (tag)
open_tag_set_absolute_font_size (tag, n);
}
else if (strcmp (size, "smaller") == 0)
{
if (tag)
{
tag->scale_level_delta -= 1;
tag->scale_level -= 1;
}
}
else if (strcmp (size, "larger") == 0)
{
if (tag)
{
tag->scale_level_delta += 1;
tag->scale_level += 1;
}
}
else if (parse_absolute_size (tag, size))
; /* nothing */
else
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_INVALID_CONTENT,
_("Value of 'size' attribute on <span> tag on line %d "
"could not be parsed; should be an integer, or a "
"string such as 'small', not '%s'"),
line_number, size);
goto error;
}
}
if (G_UNLIKELY (style))
{
PangoStyle pango_style;
if (pango_parse_style (style, &pango_style, FALSE))
add_attribute (tag, pango_attr_style_new (pango_style));
else
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_INVALID_CONTENT,
_("'%s' is not a valid value for the 'style' attribute "
"on <span> tag, line %d; valid values are "
"'normal', 'oblique', 'italic'"),
style, line_number);
goto error;
}
}
if (G_UNLIKELY (weight))
{
PangoWeight pango_weight;
if (pango_parse_weight (weight, &pango_weight, FALSE))
add_attribute (tag,
pango_attr_weight_new (pango_weight));
else
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_INVALID_CONTENT,
_("'%s' is not a valid value for the 'weight' "
"attribute on <span> tag, line %d; valid "
"values are for example 'light', 'ultrabold' or a number"),
weight, line_number);
goto error;
}
}
if (G_UNLIKELY (variant))
{
PangoVariant pango_variant;
if (pango_parse_variant (variant, &pango_variant, FALSE))
add_attribute (tag, pango_attr_variant_new (pango_variant));
else
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_INVALID_CONTENT,
_("'%s' is not a valid value for the 'variant' "
"attribute on <span> tag, line %d; valid values are "
"'normal', 'smallcaps'"),
variant, line_number);
goto error;
}
}
if (G_UNLIKELY (stretch))
{
PangoStretch pango_stretch;
if (pango_parse_stretch (stretch, &pango_stretch, FALSE))
add_attribute (tag, pango_attr_stretch_new (pango_stretch));
else
{
g_set_error (error,
G_MARKUP_ERROR,
G_MARKUP_ERROR_INVALID_CONTENT,
_("'%s' is not a valid value for the 'stretch' "
"attribute on <span> tag, line %d; valid "
"values are for example 'condensed', "
"'ultraexpanded', 'normal'"),
stretch, line_number);
goto error;
}
}
if (G_UNLIKELY (foreground))
{
PangoColor color;
if (!span_parse_color ("foreground", foreground, &color, line_number, error))
goto error;
add_attribute (tag, pango_attr_foreground_new (color.red, color.green, color.blue));
}
if (G_UNLIKELY (background))
{
PangoColor color;
if (!span_parse_color ("background", background, &color, line_number, error))
goto error;
add_attribute (tag, pango_attr_background_new (color.red, color.green, color.blue));
}
if (G_UNLIKELY (underline))
{
PangoUnderline ul = PANGO_UNDERLINE_NONE;
if (!span_parse_enum ("underline", underline, PANGO_TYPE_UNDERLINE, &ul, line_number, error))
goto error;
add_attribute (tag, pango_attr_underline_new (ul));
}
if (G_UNLIKELY (underline_color))
{
PangoColor color;
if (!span_parse_color ("underline_color", underline_color, &color, line_number, error))
goto error;
add_attribute (tag, pango_attr_underline_color_new (color.red, color.green, color.blue));
}
if (G_UNLIKELY (gravity))
{
PangoGravity gr = PANGO_GRAVITY_SOUTH;
if (!span_parse_enum ("gravity", gravity, PANGO_TYPE_GRAVITY, &gr, line_number, error))
goto error;
add_attribute (tag, pango_attr_gravity_new (gr));
}
if (G_UNLIKELY (gravity_hint))
{
PangoGravityHint hint = PANGO_GRAVITY_HINT_NATURAL;
if (!span_parse_enum ("gravity_hint", gravity_hint, PANGO_TYPE_GRAVITY_HINT, &hint, line_number, error))
goto error;
add_attribute (tag, pango_attr_gravity_hint_new (hint));
}
if (G_UNLIKELY (strikethrough))
{
gboolean b = FALSE;
if (!span_parse_boolean ("strikethrough", strikethrough, &b, line_number, error))
goto error;
add_attribute (tag, pango_attr_strikethrough_new (b));
}
if (G_UNLIKELY (strikethrough_color))
{
PangoColor color;
if (!span_parse_color ("strikethrough_color", strikethrough_color, &color, line_number, error))
goto error;
add_attribute (tag, pango_attr_strikethrough_color_new (color.red, color.green, color.blue));
}
if (G_UNLIKELY (fallback))
{
gboolean b = FALSE;
if (!span_parse_boolean ("fallback", fallback, &b, line_number, error))
goto error;
add_attribute (tag, pango_attr_fallback_new (b));
}
if (G_UNLIKELY (rise))
{
gint n = 0;
if (!span_parse_int ("rise", rise, &n, line_number, error))
goto error;
add_attribute (tag, pango_attr_rise_new (n));
}
if (G_UNLIKELY (letter_spacing))
{
gint n = 0;
if (!span_parse_int ("letter_spacing", letter_spacing, &n, line_number, error))
goto error;
add_attribute (tag, pango_attr_letter_spacing_new (n));
}
if (G_UNLIKELY (lang))
{
add_attribute (tag,
pango_attr_language_new (pango_language_from_string (lang)));
}
return TRUE;
error:
return FALSE;
}
static void
draw_str(struct gra2cairo_local *local, int draw, char *str, struct fontmap *font, int size, int space, int *fw, int *ah, int *dh)
{
PangoAttribute *attr;
PangoAttrList *alist;
PangoLayoutIter *piter;
int w, h, baseline;
if (size == 0 || str == NULL) {
if (fw)
*fw = 0;
if (ah)
*ah = 0;
if (dh)
*dh = 0;
return;
}
if (local->layout == NULL) {
local->layout = pango_cairo_create_layout(local->cairo);
}
alist = pango_attr_list_new();
attr = pango_attr_size_new_absolute(mxd2ph(local, size) * PANGO_SCALE);
pango_attr_list_insert(alist, attr);
attr = pango_attr_letter_spacing_new(mxd2ph(local, space) * PANGO_SCALE);
pango_attr_list_insert(alist, attr);
pango_layout_set_font_description(local->layout, font->font);
pango_layout_set_attributes(local->layout, alist);
pango_attr_list_unref(alist);
pango_layout_set_text(local->layout, str, -1);
pango_layout_get_pixel_size(local->layout, &w, &h);
piter = pango_layout_get_iter(local->layout);
baseline = pango_layout_iter_get_baseline(piter) / PANGO_SCALE;
if (fw)
*fw = w;
if (ah)
*ah = baseline;
if (dh)
*dh = h - baseline;
if (draw && str) {
double x, y;
double cx, cy;
x = - local->fontsin * baseline;
y = - local->fontcos * baseline;
cairo_get_current_point(local->cairo, &cx, &cy);
relative_move(local->cairo, x, y);
cairo_save(local->cairo);
cairo_rotate(local->cairo, -local->fontdir * G_PI / 180.);
pango_cairo_update_layout(local->cairo, local->layout);
if (local->text2path) {
pango_cairo_layout_path(local->cairo, local->layout);
cairo_fill(local->cairo);
cairo_restore(local->cairo);
cairo_move_to(local->cairo, cx + w * local->fontcos, cy - w * local->fontsin);
} else {
pango_cairo_show_layout(local->cairo, local->layout);
cairo_restore(local->cairo);
relative_move(local->cairo, w * local->fontcos - x, - w * local->fontsin - y);
}
}
pango_layout_iter_free(piter);
}
