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Fix some Unicode font embedding issues:

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- Reworked Widths array compression for CID fonts to require at least 4 repeated
  widths.
- Fixed the embedded CMap for Unicode fonts.
This commit is contained in:
Michael R Sweet 2025-03-06 17:09:27 -05:00
parent 4165cd23ba
commit 458f366d78
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GPG Key ID: BE67C75EC81F3244
2 changed files with 34 additions and 25 deletions
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1
CHANGES.md
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@ -18,6 +18,7 @@ v1.5.0 - 2025-03-06
- Fixed an output issue for extremely small `double` values with the
`pdfioContent` APIs.
- Fixed a missing Widths array issue for embedded TrueType fonts.
- Fixed some Unicode font embedding issues.
v1.4.1 - 2025-01-24

58
pdfio-content.c
View File

@ -1656,8 +1656,7 @@ pdfioFileCreateFontObjFromFile(
*to_unicode; // ToUnicode dictionary
pdfio_obj_t *cid2gid_obj, // CIDToGIDMap object
*to_unicode_obj;// ToUnicode object
size_t i, // Looping var
start, // Start character
size_t i, j, // Looping vars
num_cmap; // Number of CMap entries
const int *cmap; // CMap entries
int min_glyph, // First glyph
@ -1709,7 +1708,7 @@ pdfioFileCreateFontObjFromFile(
for (i = 0, bufptr = buffer, bufend = buffer + sizeof(buffer); i < num_cmap; i ++)
{
PDFIO_DEBUG("pdfioFileCreateFontObjFromFile: cmap[%u]=%d\n", (unsigned)i, cmap[i]);
if (cmap[i] < 0)
if (cmap[i] < 0 || cmap[i] >= (int)(sizeof(glyphs) / sizeof(glyphs[0])))
{
// Map undefined glyph to .notdef...
*bufptr++ = 0;
@ -1788,9 +1787,6 @@ pdfioFileCreateFontObjFromFile(
"1 begincodespacerange\n"
"<0000> <FFFF>\n"
"endcodespacerange\n"
"1 beginbfrange\n"
"<0000> <FFFF> <0000>\n"
"endbfrange\n"
"endcmap\n"
"CMapName currentdict /CMap defineresource pop\n"
"end\n"
@ -1806,40 +1802,52 @@ pdfioFileCreateFontObjFromFile(
if ((w_array = pdfioArrayCreate(pdf)) == NULL)
goto done;
for (start = 0, w0 = ttfGetWidth(font, 0), w1 = 0, i = 1; i < 65536; start = i, w0 = w1, i ++)
for (i = 0, w0 = ttfGetWidth(font, 0), w1 = 0; i < 65536; w0 = w1)
{
while (i < 65536 && (w1 = ttfGetWidth(font, (int)i)) == w0)
i ++;
if ((i - start) > 1)
for (j = 1; (i + j) < 65536; j ++)
{
// Encode a repeating sequence...
pdfioArrayAppendNumber(w_array, (double)start);
pdfioArrayAppendNumber(w_array, (double)(i - 1));
pdfioArrayAppendNumber(w_array, w0);
if ((w1 = ttfGetWidth(font, (int)(i + j))) != w0)
break;
}
if (j >= 4)
{
// Encode a long sequence of zeros...
// Encode a repeating sequence...
pdfioArrayAppendNumber(w_array, (double)i);
pdfioArrayAppendNumber(w_array, (double)(i + j - 1));
pdfioArrayAppendNumber(w_array, w0);
i += j;
}
else
{
// Encode a non-repeating sequence...
pdfioArrayAppendNumber(w_array, (double)start);
pdfioArrayAppendNumber(w_array, (double)i);
if ((temp_array = pdfioArrayCreate(pdf)) == NULL)
goto done;
pdfioArrayAppendNumber(temp_array, w0);
for (w0 = w1, i ++; i < 65536; w0 = w1, i ++)
for (i ++; i < 65536 && pdfioArrayGetSize(temp_array) < 8191; i ++, w0 = w1)
{
if ((w1 = ttfGetWidth(font, (int)i)) == w0 && i < 65535)
break;
if ((w1 = ttfGetWidth(font, (int)i)) == w0 && i < 65530)
{
size_t j; // Look-ahead
pdfioArrayAppendNumber(temp_array, w0);
for (j = 1; j < 4; j ++)
{
if (ttfGetWidth(font, (int)(i + j)) != w0)
break;
}
if (j >= 4)
break;
}
pdfioArrayAppendNumber(temp_array, w1);
}
if (i == 65536)
pdfioArrayAppendNumber(temp_array, w0);
else
i --;
pdfioArrayAppendArray(w_array, temp_array);
}
}