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Finish implementation of pdfioContentTextMeasure (Issue #17)

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This commit is contained in:
Michael R Sweet
2023-12-04 21:20:51 -05:00
parent 4919783da5
commit c188cb8dad
6 changed files with 118 additions and 15 deletions
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83
pdfio-content.c
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@@ -1061,20 +1061,97 @@ pdfioContentTextEnd(pdfio_stream_t *st) // I - Stream
//
// 'pdfioContextTextMeasure()' - Measure a text string and return its width.
// 'pdfioContentTextMeasure()' - Measure a text string and return its width.
//
// This function measures the given text string "s" and returns its width based
// on "size". The text string must always use the UTF-8 (Unicode) encoding but
// any control characters (such as newlines) are ignored.
//
double // O - Width
pdfioContextTextMeasure(
pdfioContentTextMeasure(
pdfio_obj_t *font, // I - Font object created by @link pdfioFileCreateFontObjFromFile@
const char *s, // I - UTF-8 string
double size) // I - Font size/height
{
const char *subtype; // Font sub-type
ttf_t *ttf = (ttf_t *)_pdfioObjGetExtension(font);
// TrueType font data
ttf_rect_t extents; // Text extents
int ch; // Unicode character
char temp[1024], // Temporary string
*tempptr; // Pointer into temporary string
if ((subtype = pdfioObjGetSubtype(font)) == NULL || strcmp(subtype, "Type0"))
{
// Map non-CP1282 characters to '?', everything else as-is...
tempptr = temp;
while (*s && tempptr < (temp + sizeof(temp) - 3))
{
if ((*s & 0xe0) == 0xc0)
{
// Two-byte UTF-8
ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
s += 2;
}
else if ((*s & 0xf0) == 0xe0)
{
// Three-byte UTF-8
ch = ((s[0] & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
s += 3;
}
else if ((*s & 0xf8) == 0xf0)
{
// Four-byte UTF-8
ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
s += 4;
}
else
{
ch = *s++;
}
if (ch > 255)
{
// Try mapping from Unicode to CP1252...
size_t i; // Looping var
for (i = 0; i < (sizeof(_pdfio_cp1252) / sizeof(_pdfio_cp1252[0])); i ++)
{
if (ch == _pdfio_cp1252[i])
break;
}
if (i >= (sizeof(_pdfio_cp1252) / sizeof(_pdfio_cp1252[0])))
ch = '?'; // Unsupported chars map to ?
}
if (ch < 128)
{
// ASCII
*tempptr++ = ch;
}
else if (ch < 2048)
{
// 2-byte UTF-8
*tempptr++ = 0xc0 | ((ch >> 6) & 0x1f);
*tempptr++ = 0x80 | (ch & 0x3f);
}
else
{
// 3-byte UTF-8
*tempptr++ = 0xe0 | ((ch >> 12) & 0x0f);
*tempptr++ = 0x80 | ((ch >> 6) & 0x3f);
*tempptr++ = 0x80 | (ch & 0x3f);
}
}
*tempptr = '\0';
s = temp;
}
ttfGetExtents(ttf, size, s, &extents);
return (extents.right - extents.left);
@@ -1654,7 +1731,7 @@ pdfioFileCreateFontObjFromFile(
if (fd >= 0)
close(fd);
ttfDelete(font);
_pdfioObjSetExtension(obj, font, (_pdfio_extfree_t)ttfDelete);
return (obj);
}