static PangoCoverage *
pango_coverage_from_cf_charset (CFCharacterSetRef charset)
{
CFIndex i, length;
CFDataRef bitmap;
const UInt8 *ptr;
PangoCoverage *coverage;
coverage = pango_coverage_new ();
bitmap = CFCharacterSetCreateBitmapRepresentation (kCFAllocatorDefault,
charset);
/* We only handle the BMP plane */
length = MIN (CFDataGetLength (bitmap), 8192);
ptr = CFDataGetBytePtr (bitmap);
/* FIXME: can and should this be done more efficiently? */
for (i = 0; i < length; i++)
{
int j;
for (j = 0; j < 8; j++)
pango_coverage_set (coverage, i * 8 + j,
((ptr[i] & (1 << j)) == (1 << j)) ?
PANGO_COVERAGE_EXACT : PANGO_COVERAGE_NONE);
}
CFRelease (bitmap);
return coverage;
}
/* static */
void FontUtils::GetAllRenderableCharacters(const vector<string>& fonts,
vector<bool>* unichar_bitmap) {
// Form the union of coverage maps from the fonts
PangoCoverage* all_coverage = pango_coverage_new();
tlog(1, "Processing %d fonts\n", fonts.size());
for (int i = 0; i < fonts.size(); ++i) {
PangoFontInfo font_info(fonts[i]);
PangoCoverage* coverage = pango_font_get_coverage(
font_info.ToPangoFont(), NULL);
// Mark off characters that any font can render.
pango_coverage_max(all_coverage, coverage);
}
CharCoverageMapToBitmap(all_coverage, unichar_bitmap);
pango_coverage_unref(all_coverage);
}
SCRIPT_ENGINE_DEFINITION
static PangoCoverage *
pango_indic_engine_get_coverage (PangoFont * font, PangoLanguage *lang)
{
gunichar i;
PangoCoverage *result = pango_coverage_new ();
PangoXSubfont subfont;
int dev_font = pango_x_find_first_subfont (font, &default_charset, 1, &subfont);
if (dev_font)
{
for (i = RANGE_START; i <= RANGE_END; i++)
pango_coverage_set (result, i, PANGO_COVERAGE_EXACT);
}
return result;
}
static PangoCoverage *
thai_engine_x_get_coverage (PangoFont *font,
PangoLanguage *lang)
{
PangoCoverage *result = pango_coverage_new ();
ThaiFontInfo *font_info = thai_x_get_font_info (font);
if (font_info->font_set != THAI_FONT_NONE)
{
gunichar wc;
for (wc = 0xe01; wc <= 0xe3a; wc++)
pango_coverage_set (result, wc, PANGO_COVERAGE_EXACT);
for (wc = 0xe3f; wc <= 0xe5b; wc++)
pango_coverage_set (result, wc, PANGO_COVERAGE_EXACT);
}
return result;
}
static PangoCoverage *
ct_font_descriptor_get_coverage (CTFontDescriptorRef desc)
{
CFCharacterSetRef charset;
CFIndex i, length;
CFDataRef bitmap;
const UInt8 *ptr;
PangoCoverage *coverage;
coverage = pango_coverage_new ();
charset = CTFontDescriptorCopyAttribute (desc, kCTFontCharacterSetAttribute);
if (!charset)
/* Return an empty coverage */
return coverage;
bitmap = CFCharacterSetCreateBitmapRepresentation (kCFAllocatorDefault,
charset);
/* We only handle the BMP plane */
length = MIN (CFDataGetLength (bitmap), 8192);
ptr = CFDataGetBytePtr (bitmap);
/* FIXME: can and should this be done more efficiently? */
for (i = 0; i < length; i++)
{
int j;
for (j = 0; j < 8; j++)
pango_coverage_set (coverage, i * 8 + j,
((ptr[i] & (1 << j)) == (1 << j)) ?
PANGO_COVERAGE_EXACT : PANGO_COVERAGE_NONE);
}
CFRelease (bitmap);
CFRelease (charset);
return coverage;
}
static PangoCoverage *
ct_font_descriptor_get_coverage (CTFontDescriptorRef desc)
{
CFCharacterSetRef charset;
CFIndex i, length;
CFDataRef bitmap;
const UInt8 *ptr, *plane_ptr;
const UInt32 plane_size = 8192;
PangoCoverage *coverage;
coverage = pango_coverage_new ();
charset = CTFontDescriptorCopyAttribute (desc, kCTFontCharacterSetAttribute);
if (!charset)
/* Return an empty coverage */
return coverage;
bitmap = CFCharacterSetCreateBitmapRepresentation (kCFAllocatorDefault,
charset);
ptr = CFDataGetBytePtr (bitmap);
/* First handle the BMP plane. */
length = MIN (CFDataGetLength (bitmap), plane_size);
/* FIXME: can and should this be done more efficiently? */
for (i = 0; i < length; i++)
{
int j;
for (j = 0; j < 8; j++)
if ((ptr[i] & (1 << j)) == (1 << j))
pango_coverage_set (coverage, i * 8 + j, PANGO_COVERAGE_EXACT);
}
/* Next, handle the other planes. The plane number is encoded first as
* a single byte. In the following 8192 bytes that plane's coverage bitmap
* is stored.
*/
plane_ptr = ptr + plane_size;
while (plane_ptr - ptr < CFDataGetLength (bitmap))
{
const UInt8 plane_number = *plane_ptr;
plane_ptr++;
for (i = 0; i < plane_size; i++)
{
int j;
for (j = 0; j < 8; j++)
if ((plane_ptr[i] & (1 << j)) == (1 << j))
pango_coverage_set (coverage, (plane_number * plane_size + i) * 8 + j,
PANGO_COVERAGE_EXACT);
}
plane_ptr += plane_size;
}
CFRelease (bitmap);
CFRelease (charset);
return coverage;
}
static VALUE
coverage_initialize(VALUE self)
{
G_INITIALIZE(self, pango_coverage_new());
return Qnil;
}