void SimpleFontData::platformInit()
{
FT_Face face = m_platformData.m_face;
if (face) {
m_ascent = static_cast<int> (DOUBLE_FROM_26_6(face->size->metrics.ascender));
m_descent = -static_cast<int> (DOUBLE_FROM_26_6(face->size->metrics.descender));
m_lineSpacing = static_cast<int> (DOUBLE_FROM_26_6(face->size->metrics.height));
FT_Load_Char(face, 'x', FT_LOAD_DEFAULT);
m_xHeight = DOUBLE_FROM_26_6(face->glyph->metrics.height);
FT_Load_Char(face, ' ', FT_LOAD_DEFAULT);
m_spaceWidth = DOUBLE_FROM_26_6(face->glyph->metrics.horiAdvance);
m_lineGap = m_lineSpacing - m_ascent + m_descent;
}
}
static cairo_status_t
glyph_array_add_text(glyph_array_t *glyphs, cairo_t *cr, const char *s, double spacing)
{
cairo_scaled_font_t *scaled_font;
cairo_status_t status;
FT_Face face;
unsigned long charcode;
unsigned int index;
cairo_text_extents_t extents;
const char *p;
FT_Vector kerning;
double kern_x;
int first = TRUE;
scaled_font = cairo_get_scaled_font (cr);
status = cairo_scaled_font_status (scaled_font);
if (status)
return status;
face = cairo_ft_scaled_font_lock_face (scaled_font);
if (face == NULL)
return CAIRO_STATUS_FONT_TYPE_MISMATCH;
p = s;
while (*p)
{
charcode = *p;
index = FT_Get_Char_Index (face, charcode);
glyphs->glyph_list[glyphs->num_glyphs].index = index;
if (first) {
first = FALSE;
glyphs->glyph_list[glyphs->num_glyphs].x = glyphs->x;
glyphs->glyph_list[glyphs->num_glyphs].y = glyphs->y;
} else {
cairo_glyph_extents (cr, &glyphs->glyph_list[glyphs->num_glyphs - 1], 1, &extents);
FT_Get_Kerning (face,
glyphs->glyph_list[glyphs->num_glyphs - 1].index,
glyphs->glyph_list[glyphs->num_glyphs].index,
FT_KERNING_UNSCALED,
&kerning);
kern_x = DOUBLE_FROM_26_6(kerning.x);
glyphs->glyph_list[glyphs->num_glyphs].x =
glyphs->glyph_list[glyphs->num_glyphs - 1].x + extents.x_advance + kern_x + spacing;
glyphs->glyph_list[glyphs->num_glyphs].y =
glyphs->glyph_list[glyphs->num_glyphs - 1].y + extents.y_advance;
}
cairo_glyph_extents (cr, &glyphs->glyph_list[glyphs->num_glyphs], 1, &extents);
glyphs->x = glyphs->glyph_list[glyphs->num_glyphs].x + extents.x_advance + spacing;
glyphs->y = glyphs->glyph_list[glyphs->num_glyphs].y + extents.y_advance;
p++;
glyphs->num_glyphs++;
}
cairo_ft_scaled_font_unlock_face (scaled_font);
return CAIRO_STATUS_SUCCESS;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
FT_Face face = m_font.m_face;
if (FT_Load_Glyph(face, glyph, FT_LOAD_DEFAULT)) {
return m_spaceWidth;
}
if (face->glyph->advance.x)
return DOUBLE_FROM_26_6(face->glyph->advance.x);
return m_spaceWidth;
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
float width = 0;
FT_Face face = m_platformData.m_face;
if (FT_Load_Glyph(face, glyph, FT_LOAD_DEFAULT)) {
width = m_spaceWidth;
}
else if (face->glyph->advance.x) {
width = DOUBLE_FROM_26_6(face->glyph->advance.x);
}
else {
width = m_spaceWidth;
}
return width;
}
/* Currently not used */
static int
CalculateStringWidthsUTF8 (cairo_t *ct, GDIPCONST GpFont *gdiFont, const BYTE *utf8, unsigned long StringDetailElements, GpStringDetailStruct *StringDetails)
{
FT_Face face;
size_t i;
gunichar *ucs4 = NULL;
cairo_font_face_t *Font;
GpStringDetailStruct *CurrentDetail;
glong NumOfGlyphs;
cairo_matrix_t matrix;
#ifdef DRAWSTRING_DEBUG
printf("CalculateStringWidths(font, %s, %d, details) called\n", utf8, StringDetailElements);
#endif
Font = (cairo_font_face_t *)gdiFont->cairofnt;
face = gdip_cairo_ft_font_lock_face(Font);
if (!face)
return 0;
cairo_get_font_matrix(ct, &matrix);
cairo_matrix_scale(&matrix, gdiFont->sizeInPixels, gdiFont->sizeInPixels);
ucs4 = g_utf8_to_ucs4 ((const gchar *) utf8, (glong)-1, NULL, &NumOfGlyphs, NULL);
if ((NumOfGlyphs == 0) || (ucs4 == NULL)) {
return 0;
}
CurrentDetail=StringDetails;
for (i = 0; i < NumOfGlyphs; i++) {
FT_Load_Glyph (face, FT_Get_Char_Index (face, ucs4[i]), FT_LOAD_DEFAULT);
CurrentDetail->Width = DOUBLE_FROM_26_6 (face->glyph->advance.x);
CurrentDetail++;
}
gdip_cairo_ft_font_unlock_face(Font);
GdipFree(ucs4);
#ifdef DRAWSTRING_DEBUG
printf("CalculateStringWidths: string >%s< translated into %d glyphs\n", utf8, NumOfGlyphs);
#endif
return NumOfGlyphs;
}
