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Finish implementation of pdfioContentTextMeasure (Issue #17)

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Michael R Sweet 2023-12-04 21:20:51 -05:00
parent 4919783da5
commit c188cb8dad
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6 changed files with 118 additions and 15 deletions
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3
Makefile.in
View File

@ -233,8 +233,7 @@ DOCFLAGS = \
doc:
echo Generating documentation...
codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(PDFIO_VERSION)" $(PUBHEADERS) $(PUBOBJS:.o=.c) --body doc/pdfio.md --coverimage doc/pdfio-512.png pdfio.xml >doc/pdfio.html
codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(PDFIO_VERSIONmc6809e
)" --body doc/pdfio.md --coverimage doc/pdfio-epub.png pdfio.xml --epub doc/pdfio.epub
codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(PDFIO_VERSION)" --body doc/pdfio.md --coverimage doc/pdfio-epub.png pdfio.xml --epub doc/pdfio.epub
codedoc $(DOCFLAGS) --title "pdf read/write library" --man pdfio --section 3 --body doc/pdfio.md pdfio.xml >doc/pdfio.3
rm -f pdfio.xml

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);
}

2
pdfio-content.h
View File

@ -115,7 +115,7 @@ extern bool pdfioContentSetTextXScaling(pdfio_stream_t *st, double percent) _PD
extern bool pdfioContentStroke(pdfio_stream_t *st) _PDFIO_PUBLIC;
extern bool pdfioContentTextBegin(pdfio_stream_t *st) _PDFIO_PUBLIC;
extern bool pdfioContentTextEnd(pdfio_stream_t *st) _PDFIO_PUBLIC;
extern double pdfioContextTextMeasure(pdfio_obj_t *font, const char *s, double size) _PDFIO_PUBLIC;
extern double pdfioContentTextMeasure(pdfio_obj_t *font, const char *s, double size) _PDFIO_PUBLIC;
extern bool pdfioContentTextMoveLine(pdfio_stream_t *st, double tx, double ty) _PDFIO_PUBLIC;
extern bool pdfioContentTextMoveTo(pdfio_stream_t *st, double tx, double ty) _PDFIO_PUBLIC;
extern bool pdfioContentTextNextLine(pdfio_stream_t *st) _PDFIO_PUBLIC;

7
pdfio-object.c
View File

@ -217,8 +217,13 @@ void
_pdfioObjDelete(pdfio_obj_t *obj) // I - Object
{
if (obj)
{
pdfioStreamClose(obj->stream);
if (obj->datafree)
(obj->datafree)(obj->data);
}
free(obj);
}
@ -513,7 +518,7 @@ void
_pdfioObjSetExtension(
pdfio_obj_t *obj, // I - Object
void *data, // I - Data
void (*datafree)(void *)) // I - Free function
_pdfio_extfree_t datafree) // I - Free function
{
obj->data = data;
obj->datafree = datafree;

7
pdfio-private.h
View File

@ -92,6 +92,9 @@
# define PDFIO_MAX_DEPTH 32 // Maximum nesting depth for values
typedef void (*_pdfio_extfree_t)(void *);
// Extension data free function
typedef enum _pdfio_mode_e // Read/write mode
{
_PDFIO_MODE_READ, // Read a PDF file
@ -288,7 +291,7 @@ struct _pdfio_obj_s // Object
_pdfio_value_t value; // Dictionary/number/etc. value
pdfio_stream_t *stream; // Open stream, if any
void *data; // Extension data, if any
void (*datafree)(void *); // Free callback for extension data
_pdfio_extfree_t datafree; // Free callback for extension data
};
struct _pdfio_stream_s // Stream
@ -369,7 +372,7 @@ extern bool _pdfioFileWrite(pdfio_file_t *pdf, const void *buffer, size_t bytes
extern void _pdfioObjDelete(pdfio_obj_t *obj) _PDFIO_INTERNAL;
extern void *_pdfioObjGetExtension(pdfio_obj_t *obj) _PDFIO_INTERNAL;
extern bool _pdfioObjLoad(pdfio_obj_t *obj) _PDFIO_INTERNAL;
extern void _pdfioObjSetExtension(pdfio_obj_t *obj, void *data, void (*datafree)(void *)) _PDFIO_INTERNAL;
extern void _pdfioObjSetExtension(pdfio_obj_t *obj, void *data, _pdfio_extfree_t datafree) _PDFIO_INTERNAL;
extern pdfio_stream_t *_pdfioStreamCreate(pdfio_obj_t *obj, pdfio_obj_t *length_obj, pdfio_filter_t compression) _PDFIO_INTERNAL;
extern pdfio_stream_t *_pdfioStreamOpen(pdfio_obj_t *obj, bool decode) _PDFIO_INTERNAL;

27
testpdfio.c
View File

@ -2242,6 +2242,7 @@ write_font_test(
char title[256], // Page title
textname[256], // Name of text font
*ptr; // Pointer into name
double width; // Text width
int i; // Looping var
static const char * const welcomes[] =// "Welcome" in many languages
{
@ -2463,8 +2464,8 @@ write_font_test(
else
goto error;
fputs("pdfioContentTextMoveTo(36.0, 702.0): ", stdout);
if (pdfioContentTextMoveTo(st, 36.0, 702.0))
fputs("pdfioContentTextMoveTo(198.0, 702.0): ", stdout);
if (pdfioContentTextMoveTo(st, 198.0, 702.0))
puts("PASS");
else
return (1);
@ -2473,18 +2474,36 @@ write_font_test(
{
if (i > 0 && (i % 50) == 0)
{
fputs("pdfioContentTextMoveTo(200.0, 600.0): ", stdout);
if (pdfioContentTextMoveTo(st, 200.0, 600.0))
fputs("pdfioContentTextMoveTo(162.0, 600.0): ", stdout);
if (pdfioContentTextMoveTo(st, 162.0, 600.0))
puts("PASS");
else
return (1);
}
printf("pdfioContentTextMeasure(\"%s\"): ", welcomes[i]);
if ((width = pdfioContentTextMeasure(textfont, welcomes[i], 10.0)) >= 0.0)
puts("PASS");
else
return (1);
printf("pdfioContextTextMoveTo(%g, 0.0): ", -width);
if (pdfioContentTextMoveTo(st, -width, 0.0))
puts("PASS");
else
return (1);
printf("pdfioContentTextShowf(\"%s\"): ", welcomes[i]);
if (pdfioContentTextShowf(st, unicode, "%s\n", welcomes[i]))
puts("PASS");
else
return (1);
printf("pdfioContextTextMoveTo(%g, 0.0): ", width);
if (pdfioContentTextMoveTo(st, width, 0.0))
puts("PASS");
else
return (1);
}
fputs("pdfioContentTextEnd(): ", stdout);