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Diffstat (limited to 'source/luametatex/source/tex/texbuildpage.h')
| -rw-r--r-- | source/luametatex/source/tex/texbuildpage.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/source/luametatex/source/tex/texbuildpage.h b/source/luametatex/source/tex/texbuildpage.h new file mode 100644 index 000000000..328bed2a1 --- /dev/null +++ b/source/luametatex/source/tex/texbuildpage.h @@ -0,0 +1,104 @@ +/* + See license.txt in the root of this project. +*/ + +# ifndef LMT_BUILDPAGE_H +# define LMT_BUILDPAGE_H + +/*tex + + The state of |page_contents| is indicated by two special values. + +*/ + +typedef enum contribution_codes { + contribute_nothing, + contribute_insert, /*tex An insert node has been contributed, but no boxes. */ + contribute_box, /*tex A box has been contributed. */ + contribute_rule, /*tex A rule has been contributed. */ +} contribution_codes; + +typedef struct page_builder_state_info { + halfword page_tail; /*tex The final node on the current page. */ + int contents; /*tex What is on the current page so far? */ + scaled max_depth; /*tex The maximum box depth on page being built. */ + halfword best_break; /*tex Break here to get the best page known so far. */ + int least_cost; /*tex The score for this currently best page. */ + scaled best_size; /*tex Its |page_goal| so it can go away. */ + scaled goal; + scaled vsize; + scaled total; + scaled depth; + union { + scaled page_so_far[6]; /*tex The height and glue of the current page. */ + struct { + scaled initial; + scaled stretch; + scaled filstretch; + scaled fillstretch; + scaled filllstretch; + scaled shrink; + }; + }; + int insert_penalties; /*tex The sum of the penalties for held-over insertions. */ + halfword insert_heights; + halfword last_glue; /*tex Used to implement |\lastskip|. */ + halfword last_penalty; /*tex Used to implement |\lastpenalty|. */ + scaled last_kern; /*tex Used to implement |\lastkern|. */ + int last_extra_used; + halfword last_boundary; + int last_node_type; /*tex Used to implement |\lastnodetype|. */ + int last_node_subtype; /*tex Used to implement |\lastnodesubtype|. */ + int output_active; + int dead_cycles; + int current_state; +} page_builder_state_info; + +extern page_builder_state_info lmt_page_builder_state; + +typedef enum page_property_states { + page_initial_state, /* we need an offset and are aligned anyway */ + page_stretch_state, + page_filstretch_state, + page_fillstretch_state, + page_filllstretch_state, + page_shrink_state, +} page_property_states; + +# define page_state_offset(c) (c - page_stretch_code + page_stretch_state) + +/*tex + + The data structure definitions here use the fact that the |height| field + appears in the fourth word of a box node. + +*/ + +extern void tex_initialize_buildpage (void); +extern void tex_initialize_pagestate (void); +extern void tex_build_page (void); +extern void tex_resume_after_output (void); +extern void tex_print_page_totals (void); + +/*tex The tail of the contribution list: */ + +# define contribute_tail lmt_nest_state.nest[0].tail + +# define page_goal lmt_page_builder_state.goal /*tex The desired height of information on page being built. */ +# define page_vsize lmt_page_builder_state.vsize +# define page_total lmt_page_builder_state.total /*tex The height of the current page. */ +# define page_depth lmt_page_builder_state.depth /*tex The depth of the current page. */ + +//# define page_stretch lmt_page_builder_state.page_so_far[page_stretch_state] +//# define page_filstretch lmt_page_builder_state.page_so_far[page_filstretch_state] +//# define page_fillstretch lmt_page_builder_state.page_so_far[page_fillstretch_state] +//# define page_filllstretch lmt_page_builder_state.page_so_far[page_filllstretch_state] +//# define page_shrink lmt_page_builder_state.page_so_far[page_shrink_state] + +# define page_stretch lmt_page_builder_state.stretch +# define page_filstretch lmt_page_builder_state.filstretch +# define page_fillstretch lmt_page_builder_state.fillstretch +# define page_filllstretch lmt_page_builder_state.filllstretch +# define page_shrink lmt_page_builder_state.shrink + +# endif |