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58 lines
2.3 KiB
Plaintext
58 lines
2.3 KiB
Plaintext
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Adding paged output
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===================
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This document is supposed to be a short guide of adding paged output to Netsurf.
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Currently the two pieces of code using the print implementation are PDF export
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and GTK printing.
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printer.h
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---------
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The first thing the new paged output has to do is implementing the printer
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interface located in printer.h. It consists of four elements:
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- plotter. This are the plotters which will be used while redrawing the
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content.
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- print_begin. This function is called right after the set up and should
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manage all the remaining user-specific initialisation stuff.
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- print_next_page. This function is called before the actual printing of each
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page allowing to prepare the content to be printed.
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- print_end. This function is called right before the printing routines clean
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after themselves and should be used for saving the output to a file, freeing
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previously allocated memory, relesing document handles etc.
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print.h
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-------
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The provided print interface consists of a set of functions which can be used
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seperately and one integrating them all making the print a matter of one call.
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If it is enough you can just call print_basic_run and wait for it to return.
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However, for the case you can't accompish the printing task this way the print
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interface gives you the possiblity of calling the print steps individually.
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Only if you are using print_basic_run you can omit specifying the print settings.
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If this is the case the default ones will be used.
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As you will notice the functions correspond to those you had to implement in the
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printer. The reason for this is adding some flexibility to the system which
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occured necessary i.e in the GTK print implementation.
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- print_set_up. This sets the printing system up and calls print_begin
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- print_draw_next_page. Here after calling print_next_page one full page of the
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dimensions given in the print settings is plotted
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- print_cleanup. This function is responsible for freeing all used resources
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right after calling print_end
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Settings
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--------
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This is where the besic information about the print job is held. You can use one
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of the predifined sets(DEFAULT and OPTIONS) or add your own. In order to do that
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you have to follow this steps:
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- add your entry to the print_configuration enum
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- add handling of it to the switch in print_make_settings
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- add the entry name to this document
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