From 2d050584bcf6e14c91d264388f69da3cc3b17c67 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Sat, 24 Dec 2011 13:07:30 +0000
Subject: Add PDF export

---
 data/colloquium.ui |  1 +
 src/mainwindow.c   | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 src/slide_render.c | 54 +++++++++++++++++++++++++++++++++++++++++++++---------
 src/slide_render.h |  2 ++
 4 files changed, 95 insertions(+), 9 deletions(-)

diff --git a/data/colloquium.ui b/data/colloquium.ui
index 94e502f..1033b48 100644
--- a/data/colloquium.ui
+++ b/data/colloquium.ui
@@ -8,6 +8,7 @@
 			<menuitem name="save" action="SaveAction" />
 			<menuitem name="saveas" action="SaveAsAction" />
 			<menuitem name="savestyle" action="SaveStyleAction" />
+			<menuitem name="exportpdf" action="ExportPDFAction" />
 			<separator />
 			<menuitem name="quit" action="QuitAction" />
 		</menu>
diff --git a/src/mainwindow.c b/src/mainwindow.c
index 15d8025..f82db7b 100644
--- a/src/mainwindow.c
+++ b/src/mainwindow.c
@@ -290,6 +290,51 @@ static gint save_ss_sig(GtkWidget *widget, struct presentation *p)
 }
 
 
+static gint export_pdf_response_sig(GtkWidget *d, gint response,
+                                    struct presentation *p)
+{
+	if ( response == GTK_RESPONSE_ACCEPT ) {
+
+		char *filename;
+
+		filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(d));
+
+		if ( export_pdf(p, filename) ) {
+			show_error(p, "Failed to export as PDF");
+		}
+
+		g_free(filename);
+
+	}
+
+	gtk_widget_destroy(d);
+
+	return 0;
+}
+
+
+static gint export_pdf_sig(GtkWidget *widget, struct presentation *p)
+{
+	GtkWidget *d;
+
+	d = gtk_file_chooser_dialog_new("Export PDF",
+	                                GTK_WINDOW(p->window),
+	                                GTK_FILE_CHOOSER_ACTION_SAVE,
+	                                GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+	                                GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
+	                                NULL);
+	gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(d),
+	                                               TRUE);
+
+	g_signal_connect(G_OBJECT(d), "response",
+	                 G_CALLBACK(export_pdf_response_sig), p);
+
+	gtk_widget_show_all(d);
+
+	return 0;
+}
+
+
 static gint about_sig(GtkWidget *widget, struct presentation *p)
 {
 	GtkWidget *window;
@@ -502,6 +547,8 @@ static void add_menu_bar(struct presentation *p, GtkWidget *vbox)
 			NULL, NULL, G_CALLBACK(saveas_sig) },
 		{ "SaveStyleAction", GTK_STOCK_SAVE_AS, "Save St_ylesheet",
 			NULL, NULL, G_CALLBACK(save_ss_sig) },
+		{ "ExportPDFAction", GTK_STOCK_SAVE_AS, "Export PDF",
+			NULL, NULL, G_CALLBACK(export_pdf_sig) },
 		{ "QuitAction", GTK_STOCK_QUIT, "_Quit",
 			NULL, NULL, G_CALLBACK(quit_sig) },
 
diff --git a/src/slide_render.c b/src/slide_render.c
index 32c4a28..7f83ec8 100644
--- a/src/slide_render.c
+++ b/src/slide_render.c
@@ -26,6 +26,7 @@
 #endif
 
 #include <cairo.h>
+#include <cairo-pdf.h>
 #include <pango/pangocairo.h>
 #include <assert.h>
 
@@ -100,18 +101,11 @@ static void render_bgblock(cairo_t *cr, struct bgblock *b)
 }
 
 
-static cairo_surface_t *render_slide(struct slide *s, int w, int h)
+static void render_slide_bits(struct slide *s, cairo_t *cr)
 {
-	cairo_surface_t *surf;
-	cairo_t *cr;
 	int i;
 	cairo_font_options_t *fopts;
 
-	surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
-
-	cr = cairo_create(surf);
-	cairo_scale(cr, w/s->parent->slide_width, h/s->parent->slide_height);
-
 	fopts = cairo_font_options_create();
 	cairo_font_options_set_hint_style(fopts, CAIRO_HINT_STYLE_NONE);
 	cairo_font_options_set_hint_metrics(fopts, CAIRO_HINT_METRICS_OFF);
@@ -130,8 +124,22 @@ static cairo_surface_t *render_slide(struct slide *s, int w, int h)
 
 	}
 
-	cairo_destroy(cr);
 	cairo_font_options_destroy(fopts);
+}
+
+static cairo_surface_t *render_slide(struct slide *s, int w, int h)
+{
+	cairo_surface_t *surf;
+	cairo_t *cr;
+
+	surf = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
+
+	cr = cairo_create(surf);
+	cairo_scale(cr, w/s->parent->slide_width, h/s->parent->slide_height);
+
+	render_slide_bits(s, cr);
+
+	cairo_destroy(cr);
 
 	return surf;
 }
@@ -232,3 +240,31 @@ void draw_editing_box(cairo_t *cr, double xmin, double ymin,
 
 	cairo_set_dash(cr, NULL, 0, 0.0);
 }
+
+
+int export_pdf(struct presentation *p, const char *filename)
+{
+	int i;
+	cairo_surface_t *surf;
+	cairo_t *cr;
+
+	surf = cairo_pdf_surface_create(filename, p->slide_width,
+	                                          p->slide_height);
+
+	if ( cairo_surface_status(surf) != CAIRO_STATUS_SUCCESS ) {
+		fprintf(stderr, "Couldn't create Cairo surface\n");
+		return 1;
+	}
+
+	cr = cairo_create(surf);
+
+	for ( i=0; i<p->num_slides; i++ ) {
+		render_slide_bits(p->slides[i], cr);
+		cairo_surface_show_page(surf);
+	}
+
+	cairo_surface_finish(surf);
+	cairo_destroy(cr);
+
+	return 0;
+}
diff --git a/src/slide_render.h b/src/slide_render.h
index 6218924..395ef96 100644
--- a/src/slide_render.h
+++ b/src/slide_render.h
@@ -40,4 +40,6 @@ extern void draw_resize_handle(cairo_t *cr, double x, double y);
 extern void draw_editing_box(cairo_t *cr, double xmin, double ymin,
                              double width, double height);
 
+extern int export_pdf(struct presentation *p, const char *filename);
+
 #endif	/* SLIDE_RENDER_H */
-- 
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