2 * Paper printing definitions.
4 * This header file defines data structures and constants which are
5 * shared between bk_paper.c and its clients bk_ps.c and bk_pdf.c.
8 #ifndef HALIBUT_PAPER_H
9 #define HALIBUT_PAPER_H
11 /* Number of internal units per PostScript point. */
12 #define UNITS_PER_PT 1000
13 #define FUNITS_PER_PT 1000.0
15 typedef struct document_Tag document
;
16 typedef struct kern_pair_Tag kern_pair
;
17 typedef struct ligature_Tag ligature
;
18 typedef struct font_info_Tag font_info
;
19 typedef struct font_data_Tag font_data
;
20 typedef struct font_encoding_Tag font_encoding
;
21 typedef struct font_list_Tag font_list
;
22 typedef struct para_data_Tag para_data
;
23 typedef struct line_data_Tag line_data
;
24 typedef struct page_data_Tag page_data
;
25 typedef struct subfont_map_entry_Tag subfont_map_entry
;
26 typedef struct text_fragment_Tag text_fragment
;
27 typedef struct xref_Tag xref
;
28 typedef struct xref_dest_Tag xref_dest
;
29 typedef struct rect_Tag rect
;
30 typedef struct outline_element_Tag outline_element
;
33 * This data structure represents the overall document, in the form
34 * it will be given to the client backends.
37 int paper_width
, paper_height
;
40 outline_element
*outline_elements
;
41 int n_outline_elements
;
45 * This data structure represents a kerning pair within a font.
47 struct kern_pair_Tag
{
48 /* Glyph indices, in font_data.glyphs. */
49 unsigned short left
, right
;
50 /* Kern amount, in internal units. */
55 * ... and this one represents a ligature.
58 unsigned short left
, right
, lig
;
62 * This data structure holds static information about a font that doesn't
63 * depend on the particular document. It gets generated when the font's
64 * metrics are read in.
69 struct font_info_Tag
{
72 * Specify the PostScript name of the font and its point size.
76 * The file containing this font, if any.
81 * Lengths of the unencrypted and encrypted portions of the font.
83 long length1
, length2
;
85 * An array of pointers to the available glyph names, and their
86 * corresponding character widths. These two arrays have
90 const char *const *glyphs
;
93 * Glyph indices sorted into glyph-name order, for name-to-index
96 unsigned short *glyphsbyname
;
97 /* A tree of kern_pairs */
99 /* ... and one of ligatures */
102 * For reasonably speedy lookup, we set up a 65536-element
103 * table representing the Unicode BMP (I can conveniently
104 * restrict myself to the BMP for the moment since I happen to
105 * know that no glyph in the Adobe Glyph List falls outside
106 * it), whose elements are indices into the above two arrays.
108 unsigned short bmp
[65536];
110 * Various bits of metadata needed for the /FontDescriptor dictionary
124 * This structure holds the information about how a font is used
127 struct font_data_Tag
{
128 font_info
const *info
;
130 * At some point I'm going to divide the font into sub-fonts
131 * with largely non-overlapping encoding vectors. This array
132 * will track which glyphs go into which subfonts. Also here I
133 * keep track of the latest subfont of any given font, so I can
134 * go back and extend its encoding.
136 subfont_map_entry
*subfont_map
;
137 font_encoding
*latest_subfont
;
139 * The font list to which this font belongs.
144 struct subfont_map_entry_Tag
{
145 font_encoding
*subfont
;
146 unsigned char position
;
150 * This data structure represents a sub-font: a font with an
153 struct font_encoding_Tag
{
156 char *name
; /* used by client backends */
158 font_data
*font
; /* the parent font structure */
159 const char *vector
[256]; /* the actual encoding vector */
160 int indices
[256]; /* indices back into main font struct */
161 wchar_t to_unicode
[256]; /* PDF will want to know this */
162 int free_pos
; /* space left to extend encoding */
166 * This data structure represents the overall list of sub-fonts in
167 * the whole document.
169 struct font_list_Tag
{
175 * Constants defining array indices for the various fonts used in a
186 * This is the data structure which is stored in the private_data
187 * field of each paragraph. It divides the paragraph up into a
188 * linked list of lines, while at the same time providing for those
189 * lines to be linked together into a much longer list spanning the
190 * whole document for page-breaking purposes.
193 struct para_data_Tag
{
196 * Data about the fonts used in this paragraph. Indices are the
197 * FONT_* constants defined above.
199 font_data
*fonts
[NFONTS
];
202 * Pointers to the first and last line of the paragraph. The
203 * line structures are linked into a list, which runs from
204 * `first' to `last' as might be expected. However, the list
205 * does not terminate there: first->prev will end up pointing
206 * to the last line of the previous paragraph in most cases,
207 * and likewise last->next will point to the first line of the
210 line_data
*first
; /* first line in paragraph */
211 line_data
*last
; /* last line in paragraph */
213 * Some paragraphs have associated graphics; currently this is
214 * nothing more complex than a single black rectangle.
217 RECT_NONE
, RECT_CHAPTER_UNDERLINE
, RECT_RULE
220 * We left- and right-justify in special circumstances.
226 * For constructing the page outline.
228 int outline_level
; /* 0=title 1=C 2=H 3=S 4=S2... */
229 wchar_t *outline_title
;
231 * For adding the page number of a contents entry afterwards.
233 paragraph
*contents_entry
;
236 struct line_data_Tag
{
238 * The parent paragraph.
242 * Pointers to join lines into a linked list.
247 * The extent of the text displayed on this line. Also mention
248 * its starting x position, and by how much the width of spaces
249 * needs to be adjusted for paragraph justification.
251 * (Unlike most of the `last' pointers defined in this file,
252 * this `end' pointer points to the word _after_ the last one
253 * that should be displayed on the line. This is how it's
254 * returned from wrap_para().)
259 int hshortfall
, nspaces
; /* for justifying paragraphs */
262 * Auxiliary text: a section number in a margin, or a list item
263 * bullet or number. Also mention where to display this text
264 * relative to the left margin.
270 * This line might have a non-negotiable page break before it.
271 * Also there will be space required above and below it; also I
272 * store the physical line height (defined as the maximum of
273 * the heights of the three fonts in the pdata) because it's
274 * easier than looking it up repeatedly during page breaking.
281 * Penalties for page breaking before or after this line.
283 int penalty_before
, penalty_after
;
285 * These fields are used in the page breaking algorithm.
288 int *vshortfall
, *text
, *space
;
289 line_data
**page_last
; /* last line on a page starting here */
291 * After page breaking, we can assign an actual y-coordinate on
292 * the page to each line. Also we store a pointer back to the
293 * page structure itself.
300 * This data structure is constructed to describe each page of the
303 struct page_data_Tag
{
305 * Pointers to join pages into a linked list.
310 * The set of lines displayed on this page.
312 line_data
*first_line
;
313 line_data
*last_line
;
315 * After text rendering: the set of actual pieces of text
316 * needing to be displayed on this page.
318 text_fragment
*first_text
;
319 text_fragment
*last_text
;
326 * Rectangles to be drawn. (These are currently only used for
327 * underlining chapter titles and drawing horizontal rules.)
332 * The page number, as a string.
336 * This spare pointer field is for use by the client backends.
341 struct text_fragment_Tag
{
350 struct xref_dest_Tag
{
351 enum { NONE
, PAGE
, URL
} type
;
367 struct outline_element_Tag
{
368 int level
; /* 0=title 1=C 2=H 3=S 4=S2... */
373 * Functions exported from bk_paper.c
375 int kern_cmp(void *, void *); /* use when setting up kern_pairs */
376 int lig_cmp(void *, void *); /* use when setting up ligatures */
377 void font_index_glyphs(font_info
*fi
);
378 int find_glyph(font_info
const *fi
, char const *name
);
382 * Functions and data exported from psdata.c.
384 wchar_t ps_glyph_to_unicode(char const *glyph
);
385 extern const char *const ps_std_glyphs
[];
386 void init_std_fonts(void);
387 const int *ps_std_font_widths(char const *fontname
);
388 const kern_pair
*ps_std_font_kerns(char const *fontname
);
391 * Function from bk_pdf.c borrowed by bk_ps.c
393 char *pdf_outline_convert(wchar_t *s
, int *len
);
396 * Backend functions exported by in_pf.c
398 void pf_part1(font_info
*fi
, char **bufp
, size_t *lenp
);
399 void pf_part2(font_info
*fi
, char **bufp
, size_t *lenp
);