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 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;
}
