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Add printing support for GTK.

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Printing is only available in GTK versions >= 2.10. We can only embed
the page setup dialog on GTK >= 2.18, so on a GTK version less than
that, we must use a separate page setup dialog.

In GTK, printing is usually done one page at a time, so also modify
printing.c to allow printing of a single page at a time.

Create a separate drawing API for drawing to the screen and for
printing. Create a vtable for functions which need to be different
depending on whether they were called from the printing or drawing
API.

When a function is called from the printing API, it is passed a
separate instance of the frontend than if it were called from the
drawing API. In that instance of the frontend, an appropriate vtable
is available depending on whether it was called from the printing or
drawing API.

The low-level functions used for printing are enabled even if printing
is not enabled. This is in case we ever need to use them for something
other than printing with GTK. For example, using Cairo as a printing
backend when printing from the command line. Enabling the low-level
functions even when GTK printing is not available also allows them to
be compiled under as many build settings as possible, and thus lowers
the chance of undetected breakage.

Move the definition of ROOT2 from ps.c to puzzles.h so other files can
use it (gtk.c needs it for hatching).

Also add myself to the copyright list.

[Committer's note: by 'printing', this log message refers to the GTK
GUI printing system, which handles selecting a printer, printing to a
file, previewing and so on. The existing facility to generate
printable puzzles in Postscript form by running the GTK binaries in
command-line mode with the --print option is unaffected. -SGT]
This commit is contained in:
Asher Gordon
2019-12-23 22:37:27 -05:00
committed by Simon Tatham
parent 0d77dfc415
commit b443a84efe
6 changed files with 795 additions and 143 deletions
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5
puzzles.h
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@ -11,6 +11,7 @@
#include <stdbool.h>
#define PI 3.141592653589793238462643383279502884197169399
#define ROOT2 1.414213562373095048801688724209698078569672
#define lenof(array) ( sizeof(array) / sizeof(*(array)) )
@ -526,6 +527,10 @@ document *document_new(int pw, int ph, float userscale);
void document_free(document *doc);
void document_add_puzzle(document *doc, const game *game, game_params *par,
game_state *st, game_state *st2);
int document_npages(document *doc);
void document_begin(document *doc, drawing *dr);
void document_end(document *doc, drawing *dr);
void document_print_page(document *doc, drawing *dr, int page_nr);
void document_print(document *doc, drawing *dr);
/*