From 78a5f5d263c5209d685abbe657bbc5bd3f756994 Mon Sep 17 00:00:00 2001
From: tuckerrrrrrrrrr <tucker1014@hotmail.com>
Date: Sat, 14 Nov 2020 12:54:53 +0100
Subject: [PATCH] Conversion to PDF

Add the ability to convert presentations to PDF. Adds an additional
dependency: cairo.
---
 config.def.h |  1 +
 config.mk    |  7 +++++--
 sent.c       | 42 ++++++++++++++++++++++++++++++++++++++----
 3 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/config.def.h b/config.def.h
index 60eb376..e68a099 100644
--- a/config.def.h
+++ b/config.def.h
@@ -47,6 +47,7 @@ static Shortcut shortcuts[] = {
 	{ XK_n,           advance,        {.i = +1} },
 	{ XK_p,           advance,        {.i = -1} },
 	{ XK_r,           reload,         {0} },
+	{ XK_g,           pdf,            {0} },
 };
 
 static Filter filters[] = {
diff --git a/config.mk b/config.mk
index d61c554..9174687 100644
--- a/config.mk
+++ b/config.mk
@@ -7,14 +7,17 @@ VERSION = 1
 PREFIX = /usr/local
 MANPREFIX = ${PREFIX}/share/man
 
+PKG_CONFIG = pkg-config
+
 X11INC = /usr/X11R6/include
 X11LIB = /usr/X11R6/lib
 
 # includes and libs
 INCS = -I. -I/usr/include -I/usr/include/freetype2 -I${X11INC}
-LIBS = -L/usr/lib -lc -lm -L${X11LIB} -lXft -lfontconfig -lX11
+LIBS = -L/usr/lib -lc -lm -L${X11LIB} -lXft -lfontconfig -lX11 -lcairo
 # OpenBSD (uncomment)
-#INCS = -I. -I${X11INC} -I${X11INC}/freetype2
+INCS = -I. -I${X11INC} -I${X11INC}/freetype2 `${PKG_CONFIG} --cflags cairo`
+LIBS += -L/usr/local/lib
 # FreeBSD (uncomment)
 #INCS = -I. -I/usr/local/include -I/usr/local/include/freetype2 -I${X11INC}
 #LIBS = -L/usr/local/lib -lc -lm -L${X11LIB} -lXft -lfontconfig -lX11
diff --git a/sent.c b/sent.c
index 9534fca..dc5cf89 100644
--- a/sent.c
+++ b/sent.c
@@ -19,6 +19,10 @@
 #include <X11/Xutil.h>
 #include <X11/Xft/Xft.h>
 
+#include <cairo/cairo.h>
+#include <cairo/cairo-xlib.h>
+#include <cairo/cairo-pdf.h>
+
 #include "arg.h"
 #include "util.h"
 #include "drw.h"
@@ -97,6 +101,7 @@ static void cleanup(int slidesonly);
 static void reload(const Arg *arg);
 static void load(FILE *fp);
 static void advance(const Arg *arg);
+static void pdf();
 static void quit(const Arg *arg);
 static void resize(int width, int height);
 static void run();
@@ -428,10 +433,6 @@ load(FILE *fp)
 		maxlines = 0;
 		memset((s = &slides[slidecount]), 0, sizeof(Slide));
 		do {
-			/* if there's a leading null, we can't do blen-1 */
-			if (buf[0] == '\0')
-				continue;
-
 			if (buf[0] == '#')
 				continue;
 
@@ -479,6 +480,39 @@ advance(const Arg *arg)
 	}
 }
 
+void
+pdf()
+{
+	const Arg next = { .i = 1 };
+	Arg first;
+	cairo_surface_t *cs;
+
+	char filename[strlen(fname) + 5];
+	sprintf(filename, "%s.pdf", fname);
+	cairo_surface_t *pdf = cairo_pdf_surface_create(filename, xw.w, xw.h);
+
+	cairo_t *cr = cairo_create(pdf);
+
+	first.i = -idx;
+	advance(&first);
+
+	cs = cairo_xlib_surface_create(xw.dpy, xw.win, xw.vis, xw.w, xw.h);
+	cairo_set_source_surface(cr, cs, 0.0, 0.0);
+	for (int i = 0; i < slidecount; ++i) {
+		cairo_paint(cr);
+		cairo_show_page(cr);
+		cairo_surface_flush(cs);
+		advance(&next);
+		cairo_surface_mark_dirty(cs);
+	}
+	cairo_surface_destroy(cs);
+
+	cairo_destroy(cr);
+	cairo_surface_destroy(pdf);
+	first.i = -(slidecount-1);
+	advance(&first);
+}
+
 void
 quit(const Arg *arg)
 {
-- 
2.29.2