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Basic text support.

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This commit is contained in:
Michael R Sweet
2021-05-31 19:41:02 -04:00
parent c4e0421f62
commit 82e62ae852
3 changed files with 355 additions and 53 deletions
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214
pdfio-content.c
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@@ -45,19 +45,7 @@ typedef pdfio_obj_t *(*_pdfio_image_func_t)(pdfio_dict_t *dict, int fd);
static pdfio_obj_t *copy_jpeg(pdfio_dict_t *dict, int fd);
static pdfio_obj_t *copy_png(pdfio_dict_t *dict, int fd);
static pdfio_array_t *create_calcolor(pdfio_file_t *pdf, size_t num_colors, double gamma, const double matrix[3][3], const double white_point[3]);
static bool write_string(pdfio_stream_t *st, const char *s);
//
// 'pdfioContentBeginText()' - Begin a text block.
//
bool // O - `true` on success, `false` on failure
pdfioContentBeginText(
pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "BT\n"));
}
static bool write_string(pdfio_stream_t *st, const char *s, bool *newline);
//
@@ -93,17 +81,6 @@ pdfioContentDrawImage(
}
//
// 'pdfioContentEndText()' - End a text block.
//
bool // O - `true` on success, `false` on failure
pdfioContentEndText(pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "ET\n"));
}
//
// 'pdfioContentFill()' - Fill the current path.
//
@@ -683,6 +660,29 @@ pdfioContentStroke(pdfio_stream_t *st) // I - Stream
}
//
// 'pdfioContentTextBegin()' - Begin a text block.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextBegin(
pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "BT\n"));
}
//
// 'pdfioContentTextEnd()' - End a text block.
//
bool // O - `true` on success, `false` on failure
pdfioContentTextEnd(pdfio_stream_t *st) // I - Stream
{
return (pdfioStreamPuts(st, "ET\n"));
}
//
// 'pdfioContentTextMoveLine()' - Move to the next line and offset.
//
@@ -730,12 +730,49 @@ pdfioContentTextNextLine(
bool // O - `true` on success, `false` on failure
pdfioContentTextShow(
pdfio_stream_t *st, // I - Stream
const char *s, // I - String to show
bool new_line) // I - Advance to the next line afterwards
const char *s) // I - String to show
{
write_string(st, s);
bool newline = false; // New line?
if (new_line)
// Write the string...
if (!write_string(st, s, &newline))
return (false);
// Draw it...
if (newline)
return (pdfioStreamPuts(st, "\'\n"));
else
return (pdfioStreamPuts(st, "Tj\n"));
}
//
// 'pdfioContentTextShowf()' - Show formatted text.
//
bool
pdfioContentTextShowf(
pdfio_stream_t *st, // I - Stream
const char *format, // I - `printf`-style format string
...) // I - Additional arguments as needed
{
bool newline = false; // New line?
char buffer[8192]; // Text buffer
va_list ap; // Argument pointer
// Format the string...
va_start(ap, format);
vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
// Write the string...
if (!write_string(st, buffer, &newline))
return (false);
// Draw it...
if (newline)
return (pdfioStreamPuts(st, "\'\n"));
else
return (pdfioStreamPuts(st, "Tj\n"));
@@ -770,7 +807,7 @@ pdfioContentTextShowJustified(
if (fragments[i])
{
if (!write_string(st, fragments[i]))
if (!write_string(st, fragments[i], NULL))
return (false);
}
}
@@ -854,11 +891,36 @@ pdfioPageDictAddFont(
const char *name, // I - Font name
pdfio_obj_t *obj) // I - Font object
{
(void)dict;
(void)name;
(void)obj;
pdfio_dict_t *resources; // Resource dictionary
pdfio_dict_t *font; // Font dictionary
return (false);
// Range check input...
if (!dict || !name || !obj)
return (false);
// Get the Resources dictionary...
if ((resources = pdfioDictGetDict(dict, "Resources")) == NULL)
{
if ((resources = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(dict, "Resources", resources))
return (false);
}
// Get the Font dictionary...
if ((font = pdfioDictGetDict(resources, "Font")) == NULL)
{
if ((font = pdfioDictCreate(dict->pdf)) == NULL)
return (false);
if (!pdfioDictSetDict(resources, "Font", font))
return (false);
}
// Now set the image reference in the Font resource dictionary and return...
return (pdfioDictSetObject(font, name, obj));
}
@@ -905,17 +967,74 @@ pdfioPageDictAddImage(
}
//
// 'pdfioFileCreateBaseFontObject()' - Create one of the base 14 PDF fonts.
//
// This function creates one of the base 14 PDF fonts. The "name" parameter
// specifies the font nane:
//
// - `Courier`
// - `Courier-Bold`
// - `Courier-BoldItalic`
// - `Courier-Italic`
// - `Helvetica`
// - `Helvetica-Bold`
// - `Helvetica-BoldOblique`
// - `Helvetica-Oblique`
// - `Symbol`
// - `Times-Bold`
// - `Times-BoldItalic`
// - `Times-Italic`
// - `Times-Roman`
// - `ZapfDingbats`
//
pdfio_obj_t * // O - Font object
pdfioFileCreateBaseFontObject(
pdfio_file_t *pdf, // I - PDF file
const char *name) // I - Font name
{
pdfio_dict_t *dict; // Font dictionary
pdfio_obj_t *obj; // Font object
if ((dict = pdfioDictCreate(pdf)) == NULL)
return (NULL);
pdfioDictSetName(dict, "Type", "Font");
pdfioDictSetName(dict, "Subtype", "Type1");
pdfioDictSetName(dict, "BaseFont", pdfioStringCreate(pdf, name));
pdfioDictSetName(dict, "Encoding", "WinAnsiEncoding");
if ((obj = pdfioFileCreateObject(dict->pdf, dict)) != NULL)
pdfioObjClose(obj);
return (obj);
}
//
// 'pdfioFileCreateFontObject()' - Add a font object to a PDF file.
//
pdfio_obj_t * // O - Object
pdfio_obj_t * // O - Font object
pdfioFileCreateFontObject(
pdfio_file_t *pdf, // I - PDF file
const char *filename) // I - Filename
const char *filename, // I - Filename
bool unicode) // I - Unicode font?
{
#if 0
pdfio_dict_t *dict; // Font dictionary
pdfio_obj_t *obj; // Font object
pdfio_st_t *st; // Content stream
int fd; // File
char buffer[16384]; // Copy buffer
ssize_t bytes; // Bytes read
#endif // 0
(void)pdf;
(void)filename;
(void)unicode;
return (NULL);
}
@@ -1274,7 +1393,8 @@ create_calcolor(
static bool // O - `true` on success, `false` otherwise
write_string(pdfio_stream_t *st, // I - Stream
const char *s) // I - String
const char *s, // I - String
bool *newline) // O - Ends with a newline?
{
const char *ptr; // Pointer into string
@@ -1291,7 +1411,7 @@ write_string(pdfio_stream_t *st, // I - Stream
// Unicode string...
int ch; // Unicode character
if (!pdfioStreamPuts(st, "("))
if (!pdfioStreamPuts(st, "<"))
return (false);
for (ptr = s; *ptr; ptr ++)
@@ -1314,6 +1434,11 @@ write_string(pdfio_stream_t *st, // I - Stream
ch = ((ptr[0] & 0x07) << 18) | ((ptr[1] & 0x3f) << 12) | ((ptr[2] & 0x3f) << 6) | (ptr[3] & 0x3f);
ptr += 3;
}
else if (*ptr == '\n' && newline)
{
*newline = true;
break;
}
else
ch = *ptr & 255;
@@ -1321,7 +1446,7 @@ write_string(pdfio_stream_t *st, // I - Stream
if (!pdfioStreamPrintf(st, "%04X", ch))
return (false);
}
if (!pdfioStreamPuts(st, ")"))
if (!pdfioStreamPuts(st, ">"))
return (false);
}
else
@@ -1357,6 +1482,19 @@ write_string(pdfio_stream_t *st, // I - Stream
level ++;
else if (*ptr == ')')
level --;
else if (*ptr == '\n' && newline)
{
if (ptr > start)
{
if (!pdfioStreamWrite(st, start, (size_t)(ptr - start)))
return (false);
start = ptr + 1;
}
*newline = true;
break;
}
}
if (ptr > start)