Add scale bars and rework UI

There were too many things in the column view.  Input title fonts,
frame rates and scales are now below and pertain to which ever input is
selected.  There are now nice handy ‘copy to all inputs’ buttons so you
don't have to enter the same information six times or whatever.

Also, this fixes a bug where ffmpeg would complain if an input's title
was empty (we just make the title a single space in this case!)

And yeah, scale bars.

inc/input.h

@@ -40,7 +40,10 @@ struct input {
 	struct input_source* source;
 
 	char* title;
-	struct font font;
+	struct font title_font;
+	double scale_length;
+	char* scale_label;
+	struct font scale_font;
 	unsigned int row;
 	unsigned int column;
 	double frame_rate;

inc/util.h

@@ -2,7 +2,7 @@
 #define __TIMELAPSE_EDITOR_UTIL_H__
 
 struct font {
-	const char* font_path;
+	char* font_name;
 	unsigned int font_size;
 	unsigned char font_colour[3];
 };

src/input.c

@@ -145,23 +145,28 @@ struct input_context* input_context_create(
 
 	char* filter_description = strdup( "" );
 
-	if ( '\0' != input->title[0] ) {
+	const char* title;
+	if ( 0 == strlen( input->title ) ) {
+		title = " ";
+	} else {
+		title = input->title;
+	}
 
 	char* title_text;
 	switch ( input->rate_unit ) {
 
 		case INPUT_RATE_FPS:
-				title_text = format_title( input->title,
+			title_text = format_title( title,
 				input->frame_rate, 1 );
 			break;
 
 		case INPUT_RATE_SPF:
-				title_text = format_title( input->title,
+			title_text = format_title( title,
 				1, input->frame_rate );
 			break;
 
 		case INPUT_RATE_MPF:
-				title_text = format_title( input->title,
+			title_text = format_title( title,
 				1, 60 * input->frame_rate );
 			break;
 
@@ -169,13 +174,31 @@ struct input_context* input_context_create(
 
 	filter_description = sappendf( filter_description,
 		"drawtext=text=%s:fontsize=%d:x=10:y=h-th-10:"
-				"fontcolor=#%02X%02X%02X:fontfile=%s",
-			title_text, input->font.font_size,
-			input->font.font_colour[0], input->font.font_colour[1],
-			input->font.font_colour[2], input->font.font_path );
+			"fontcolor=#%02X%02X%02X:font=%s",
+		title_text, input->title_font.font_size,
+		input->title_font.font_colour[0],
+		input->title_font.font_colour[1],
+		input->title_font.font_colour[2],
+		input->title_font.font_name );
 
 	free( title_text );
 
+	if ( 0 < input->scale_length ) {
+		filter_description = sappendf( filter_description,
+			",drawbox=t=fill:c=white:x=iw-10-%lf:y=ih-13:w=%lf:h=3",
+			input->scale_length, input->scale_length );
+	}
+
+	if ( 0 < strlen( input->scale_label ) ) {
+		filter_description = sappendf( filter_description,
+			",drawtext=text=%s:fontsize=%d:x=w-10-%lf/2-tw/2:y=h-th-14:"
+				"fontcolor=#%02X%02X%02X:font=%s",
+			input->scale_label, input->scale_font.font_size,
+			input->scale_length,
+			input->scale_font.font_colour[0],
+			input->scale_font.font_colour[1],
+			input->scale_font.font_colour[2],
+			input->scale_font.font_name );
 	}
 
 	AVFilterInOut* outputs = avfilter_inout_alloc();

src/output.c

@@ -457,7 +457,7 @@ void* output_all( void* data ) {
 			config->title_font.font_colour[0],
 			config->title_font.font_colour[1],
 			config->title_font.font_colour[2],
-			config->title_font.font_path );
+			config->title_font.font_name );
 
 		free( title_text );