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https://github.com/michaelrsweet/pdfio.git
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Add proper TrueType font support (Issue #2)
Still need to implement proper Unicode support (currently only writes WinAnsi font descriptor and handles UTF-8 for 0-255...)
This commit is contained in:
Michael R Sweet
parent
d1f199c7ae
commit
bbdf0cdb18
7
Makefile
7
Makefile
@ -47,7 +47,8 @@ LIBOBJS = \
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pdfio-stream.o \
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pdfio-string.o \
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pdfio-token.o \
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pdfio-value.o
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pdfio-value.o \
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ttf.o
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OBJS = \
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$(LIBOBJS) \
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testpdfio.o
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@ -133,8 +134,8 @@ testpdfio: testpdfio.o libpdfio.a
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# Dependencies
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$(OBJS): pdfio.h Makefile
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$(LIBOBJS): pdfio-private.h
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pdfio-content.o: pdfio-content.h
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pdfio-content.o: pdfio-content.h ttf.h
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ttf.o: ttf.h
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# Make documentation using Codedoc <https://www.msweet.org/codedoc>
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DOCFLAGS = \
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122
pdfio-content.c
122
pdfio-content.c
@ -13,6 +13,7 @@
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#include "pdfio-content.h"
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#include "pdfio-private.h"
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#include "ttf.h"
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#include <math.h>
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@ -64,6 +65,7 @@ typedef pdfio_obj_t *(*_pdfio_image_func_t)(pdfio_dict_t *dict, int fd);
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static pdfio_obj_t *copy_jpeg(pdfio_dict_t *dict, int fd);
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static pdfio_obj_t *copy_png(pdfio_dict_t *dict, int fd);
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static void ttf_error_cb(pdfio_file_t *pdf, const char *message);
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static unsigned update_png_crc(unsigned crc, const unsigned char *buffer, size_t length);
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static bool write_string(pdfio_stream_t *st, const char *s, bool *newline);
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@ -1159,9 +1161,19 @@ pdfioFileCreateFontObjFromFile(
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const char *filename, // I - Filename
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bool unicode) // I - Unicode font?
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{
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pdfio_dict_t *dict; // ICC profile dictionary
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pdfio_obj_t *obj; // ICC profile object
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pdfio_stream_t *st; // ICC profile stream
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ttf_t *font; // TrueType font
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int ch, // Current character
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firstch, // First character
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lastch; // Last character
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ttf_rect_t bounds; // Font bounds
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pdfio_dict_t *dict, // Font dictionary
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*desc; // Font descriptor
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pdfio_obj_t *obj, // Font object
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*desc_obj, // Font descriptor object
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*widths_obj; // Font widths object
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pdfio_array_t *bbox; // Font bounding box array
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pdfio_array_t *widths; // Font widths array
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pdfio_stream_t *st; // Font stream
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int fd; // File
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unsigned char buffer[16384]; // Read buffer
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ssize_t bytes; // Bytes read
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@ -1183,26 +1195,100 @@ pdfioFileCreateFontObjFromFile(
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return (NULL);
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}
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if ((font = ttfCreate(filename, 0, (ttf_err_cb_t)ttf_error_cb, pdf)) == NULL)
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{
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close(fd);
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return (NULL);
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}
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// Create the font descriptor dictionary and object...
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if ((bbox = pdfioArrayCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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ttfGetBounds(font, &bounds);
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pdfioArrayAppendNumber(bbox, bounds.left);
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pdfioArrayAppendNumber(bbox, bounds.bottom);
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pdfioArrayAppendNumber(bbox, bounds.right);
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pdfioArrayAppendNumber(bbox, bounds.top);
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if ((desc = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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pdfioDictSetName(desc, "Type", "FontDescriptor");
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pdfioDictSetName(desc, "FontName", pdfioStringCreate(pdf, ttfGetPostScriptName(font)));
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pdfioDictSetName(desc, "FontFamily", pdfioStringCreate(pdf, ttfGetFamily(font)));
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pdfioDictSetNumber(desc, "Flags", ttfIsFixedPitch(font) ? 0x21 : 0x20);
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pdfioDictSetArray(desc, "FontBBox", bbox);
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pdfioDictSetNumber(desc, "ItalicAngle", ttfGetItalicAngle(font));
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pdfioDictSetNumber(desc, "Ascent", ttfGetAscent(font));
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pdfioDictSetNumber(desc, "Descent", ttfGetDescent(font));
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pdfioDictSetNumber(desc, "CapHeight", ttfGetCapHeight(font));
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pdfioDictSetNumber(desc, "XHeight", ttfGetXHeight(font));
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// Note: No TrueType value exists for this but PDF requires it, so we
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// calculate a value from 50 to 250...
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pdfioDictSetNumber(desc, "StemV", ttfGetWeight(font) / 4 + 25);
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if ((desc_obj = pdfioFileCreateObj(pdf, desc)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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pdfioObjClose(desc_obj);
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// Create the widths array and object...
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if ((widths = pdfioArrayCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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firstch = 32;
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lastch = unicode ? 65535 : 255;
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for (ch = firstch; ch <= lastch; ch ++)
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pdfioArrayAppendNumber(widths, ttfGetWidth(font, ch));
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if ((widths_obj = pdfioFileCreateArrayObj(pdf, widths)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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pdfioObjClose(widths_obj);
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// Create the font object...
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if ((dict = pdfioDictCreate(pdf)) == NULL)
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{
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ttfDelete(font);
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close(fd);
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return (NULL);
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}
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pdfioDictSetName(dict, "Type", "Font");
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pdfioDictSetName(dict, "Subtype", "TrueType");
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pdfioDictSetName(dict, "BaseFont", "Bogus"); // TODO: Fix BaseFont value
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(void)unicode;
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pdfioDictSetName(dict, "Encoding", "WinAnsiEncoding"); // TODO: Fix encoding
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pdfioDictSetName(dict, "BaseFont", pdfioStringCreate(pdf, ttfGetPostScriptName(font)));
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pdfioDictSetName(dict, "Encoding", "WinAnsiEncoding"); // TODO: Fix encoding for unicode
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pdfioDictSetName(dict, "Filter", "FlateDecode");
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#if 0
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pdfioDictSetObject(dict, "FontDescriptor", descriptor);
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pdfioDictSetNumber(dict, "FirstChar", firstchar);
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pdfioDictSetNumber(dict, "LastChar", lastchar);
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pdfioDictSetArray(dict, "Widths", widths);
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#endif // 0
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pdfioDictSetObj(dict, "FontDescriptor", desc_obj);
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pdfioDictSetNumber(dict, "FirstChar", firstch);
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pdfioDictSetNumber(dict, "LastChar", lastch);
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pdfioDictSetObj(dict, "Widths", widths_obj);
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ttfDelete(font);
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if ((obj = pdfioFileCreateObj(pdf, dict)) == NULL)
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{
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@ -2104,6 +2190,18 @@ copy_png(pdfio_dict_t *dict, // I - Dictionary
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}
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//
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// 'ttf_error_cb()' - Relay a message from the TTF functions.
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//
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static void
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ttf_error_cb(pdfio_file_t *pdf, // I - PDF file
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const char *message) // I - Error message
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{
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(pdf->error_cb)(pdf, message, pdf->error_data);
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}
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//
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// 'update_png_crc()' - Update the CRC-32 value for a PNG chunk.
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//
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26
pdfio-file.c
26
pdfio-file.c
@ -273,6 +273,32 @@ pdfioFileCreate(
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}
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//
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// 'pdfioFileCreateArrayObj()' - Create a new object in a PDF file containing an array.
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//
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// This function creates a new object with an array value in a PDF file.
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// You must call @link pdfioObjClose@ to write the object to the file.
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//
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pdfio_obj_t * // O - New object
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pdfioFileCreateArrayObj(
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pdfio_file_t *pdf, // I - PDF file
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pdfio_array_t *array) // I - Object array
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{
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_pdfio_value_t value; // Object value
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// Range check input...
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if (!pdf || !array)
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return (NULL);
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value.type = PDFIO_VALTYPE_ARRAY;
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value.value.array = array;
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return (_pdfioFileCreateObj(pdf, array->pdf, &value));
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}
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//
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// 'pdfioFileCreateObj()' - Create a new object in a PDF file.
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//
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1
pdfio.h
1
pdfio.h
@ -146,6 +146,7 @@ extern bool pdfioDictSetStringf(pdfio_dict_t *dict, const char *key, const char
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extern bool pdfioFileClose(pdfio_file_t *pdf) PDFIO_PUBLIC;
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extern pdfio_file_t *pdfioFileCreate(const char *filename, const char *version, pdfio_rect_t *media_box, pdfio_rect_t *crop_box, pdfio_error_cb_t error_cb, void *error_data) PDFIO_PUBLIC;
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extern pdfio_obj_t *pdfioFileCreateArrayObj(pdfio_file_t *pdf, pdfio_array_t *array) PDFIO_PUBLIC;
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extern pdfio_obj_t *pdfioFileCreateObj(pdfio_file_t *pdf, pdfio_dict_t *dict) PDFIO_PUBLIC;
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// TODO: Add number, array, string, etc. versions of pdfioFileCreateObject?
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extern pdfio_stream_t *pdfioFileCreatePage(pdfio_file_t *pdf, pdfio_dict_t *dict) PDFIO_PUBLIC;
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113
ttf.h
Normal file
113
ttf.h
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@ -0,0 +1,113 @@
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//
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// Header file for TTF library
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//
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// https://github.com/michaelrsweet/ttf
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//
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// Copyright © 2018-2021 by Michael R Sweet.
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//
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// Licensed under Apache License v2.0. See the file "LICENSE" for more
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// information.
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//
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#ifndef TTF_H
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# define TTF_H
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//
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// Include necessary headers...
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//
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# include <stdbool.h>
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# include <sys/types.h>
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# ifdef __cplusplus
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extern "C" {
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# endif //
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//
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// Types...
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//
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typedef struct _ttf_s ttf_t; //// Font object
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typedef void (*ttf_err_cb_t)(void *data, const char *message);
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//// Font error callback
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typedef enum ttf_stretch_e //// Font stretch
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{
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TTF_STRETCH_NORMAL, // normal
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TTF_STRETCH_ULTRA_CONDENSED, // ultra-condensed
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TTF_STRETCH_EXTRA_CONDENSED, // extra-condensed
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TTF_STRETCH_CONDENSED, // condensed
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TTF_STRETCH_SEMI_CONDENSED, // semi-condensed
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TTF_STRETCH_SEMI_EXPANDED, // semi-expanded
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TTF_STRETCH_EXPANDED, // expanded
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TTF_STRETCH_EXTRA_EXPANDED, // extra-expanded
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TTF_STRETCH_ULTRA_EXPANDED // ultra-expanded
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} ttf_stretch_t;
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typedef enum ttf_style_e //// Font style
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{
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TTF_STYLE_NORMAL, // Normal font
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TTF_STYLE_ITALIC, // Italic font
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TTF_STYLE_OBLIQUE // Oblique (angled) font
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} ttf_style_t;
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typedef enum ttf_variant_e //// Font variant
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{
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TTF_VARIANT_NORMAL, // Normal font
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TTF_VARIANT_SMALL_CAPS // Font whose lowercase letters are small capitals
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} ttf_variant_t;
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typedef enum ttf_weight_e //// Font weight
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{
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TTF_WEIGHT_100 = 100, // Weight 100 (Thin)
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TTF_WEIGHT_200 = 200, // Weight 200 (Extra/Ultra-Light)
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TTF_WEIGHT_300 = 300, // Weight 300 (Light)
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TTF_WEIGHT_400 = 400, // Weight 400 (Normal/Regular)
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TTF_WEIGHT_500 = 500, // Weight 500 (Medium)
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TTF_WEIGHT_600 = 600, // Weight 600 (Semi/Demi-Bold)
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TTF_WEIGHT_700 = 700, // Weight 700 (Bold)
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TTF_WEIGHT_800 = 800, // Weight 800 (Extra/Ultra-Bold)
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TTF_WEIGHT_900 = 900 // Weight 900 (Black/Heavy)
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} ttf_weight_t;
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typedef struct ttf_rect_s //// Bounding rectangle
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{
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float left; // Left offset
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float top; // Top offset
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float right; // Right offset
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float bottom; // Bottom offset
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} ttf_rect_t;
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//
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// Functions...
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//
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extern ttf_t *ttfCreate(const char *filename, size_t idx, ttf_err_cb_t err_cb, void *err_data);
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extern void ttfDelete(ttf_t *font);
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extern int ttfGetAscent(ttf_t *font);
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extern ttf_rect_t *ttfGetBounds(ttf_t *font, ttf_rect_t *bounds);
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extern int ttfGetCapHeight(ttf_t *font);
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extern const char *ttfGetCopyright(ttf_t *font);
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extern int ttfGetDescent(ttf_t *font);
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extern ttf_rect_t *ttfGetExtents(ttf_t *font, float size, const char *s, ttf_rect_t *extents);
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extern const char *ttfGetFamily(ttf_t *font);
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extern float ttfGetItalicAngle(ttf_t *font);
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extern size_t ttfGetNumFonts(ttf_t *font);
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extern const char *ttfGetPostScriptName(ttf_t *font);
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extern ttf_stretch_t ttfGetStretch(ttf_t *font);
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extern ttf_style_t ttfGetStyle(ttf_t *font);
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extern const char *ttfGetVersion(ttf_t *font);
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extern int ttfGetWidth(ttf_t *font, int ch);
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extern ttf_weight_t ttfGetWeight(ttf_t *font);
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extern int ttfGetXHeight(ttf_t *font);
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extern bool ttfIsFixedPitch(ttf_t *font);
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# ifdef __cplusplus
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}
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# endif // __cplusplus
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#endif // !TTF_H
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