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Expose CMap in TrueType files

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This commit is contained in:
Michael R Sweet
2021-06-21 13:00:19 -04:00
parent 4f5825b3d6
commit 9ec7c8bde9
3 changed files with 206 additions and 57 deletions
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77
pdfio-content.c
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@@ -1277,12 +1277,14 @@ pdfioFileCreateFontObjFromFile(
if ((file_obj = pdfioFileCreateObj(pdf, file)) == NULL)
{
ttfDelete(font);
close(fd);
return (NULL);
}
if ((st = pdfioObjCreateStream(file_obj, PDFIO_FILTER_FLATE)) == NULL)
{
ttfDelete(font);
close(fd);
return (NULL);
}
@@ -1291,6 +1293,7 @@ pdfioFileCreateFontObjFromFile(
{
if (!pdfioStreamWrite(st, buffer, (size_t)bytes))
{
ttfDelete(font);
close(fd);
pdfioStreamClose(st);
return (NULL);
@@ -1347,11 +1350,83 @@ pdfioFileCreateFontObjFromFile(
if (unicode)
{
// Unicode (CID) font...
pdfio_dict_t *cid2gid; // CIDToGIDMap dictionary
pdfio_obj_t *cid2gid_obj; // CIDToGIDMap object
size_t i, // Looping var
num_cmap; // Number of CMap entries
const int *cmap; // CMap entries
unsigned char *bufptr, // Pointer into buffer
*bufend; // End of buffer
pdfio_dict_t *type2; // CIDFontType2 font dictionary
pdfio_obj_t *type2_obj; // CIDFontType2 font object
pdfio_array_t *descendants; // Decendant font list
pdfio_dict_t *sidict; // CIDSystemInfo dictionary
// Create a CIDToGIDMap object for the Unicode font...
if ((cid2gid = pdfioDictCreate(pdf)) == NULL)
{
ttfDelete(font);
return (NULL);
}
pdfioDictSetName(cid2gid, "Filter", "FlateDecode");
if ((cid2gid_obj = pdfioFileCreateObj(pdf, cid2gid)) == NULL)
{
ttfDelete(font);
return (NULL);
}
if ((st = pdfioObjCreateStream(cid2gid_obj, PDFIO_FILTER_FLATE)) == NULL)
{
ttfDelete(font);
return (NULL);
}
cmap = ttfGetCMap(font, &num_cmap);
for (i = 0, bufptr = buffer, bufend = buffer + sizeof(buffer); i < num_cmap; i ++)
{
if (cmap[i] < 0)
{
// Map undefined glyph to .notdef...
*bufptr++ = 0;
*bufptr++ = 0;
}
else
{
// Map to specified glyph...
*bufptr++ = (unsigned char)(cmap[i] >> 8);
*bufptr++ = (unsigned char)(cmap[i] & 255);
}
if (bufptr >= bufend)
{
// Flush buffer...
if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
{
pdfioStreamClose(st);
ttfDelete(font);
return (NULL);
}
bufptr = buffer;
}
}
if (bufptr > buffer)
{
// Flush buffer...
if (!pdfioStreamWrite(st, buffer, (size_t)(bufptr - buffer)))
{
pdfioStreamClose(st);
ttfDelete(font);
return (NULL);
}
}
pdfioStreamClose(st);
// Create a CIDFontType2 dictionary for the Unicode font...
if ((type2 = pdfioDictCreate(pdf)) == NULL)
{
@@ -1375,7 +1450,7 @@ pdfioFileCreateFontObjFromFile(
pdfioDictSetName(type2, "Subtype", "CIDFontType2");
pdfioDictSetName(type2, "BaseFont", basefont);
pdfioDictSetDict(type2, "CIDSystemInfo", sidict);
pdfioDictSetName(type2, "CIDToGIDMap", "Identity");
pdfioDictSetObj(type2, "CIDToGIDMap", cid2gid_obj);
pdfioDictSetObj(type2, "FontDescriptor", desc_obj);
if ((type2_obj = pdfioFileCreateObj(pdf, type2)) == NULL)