sch2fig/: new cairo options -o outfile.png and -s scale

sch2fig/Makefile

@@ -45,18 +45,16 @@ testref:
 		./$(NAME) test.lib test.sch | fig2dev -L png -m 2 >ref.png
 
 png:
-		./$(NAME) test.lib test.sch -- cairo
+		./$(NAME) test.lib test.sch -- cairo -o _out.png -s 2
 		[ ! -r pngref.png ] || \
-		    compare -metric AE pngref.png test.png _diff.png || \
-		    qiv -t -R -D _diff.png pngref.png test.png
+		    compare -metric AE pngref.png _out.png _diff.png || \
+		    qiv -t -R -D _diff.png pngref.png _out.png
 
 pngref:
-		./$(NAME) test.lib test.sch -- cairo
-		mv test.png pngref.png
+		./$(NAME) test.lib test.sch -- cairo -o pngref.png -s 2
 
 clean::
 		rm -f out.fig _out.png _diff.png
-		rm -f test.png
 
 #----- Render Neo900 schematics -----------------------------------------------
 

sch2fig/cairo.c

@@ -12,7 +12,9 @@
 
 
 #include <stdbool.h>
+#include <stdlib.h>
 #include <stdint.h>
+#include <unistd.h>
 #include <math.h>
 
 #include <cairo/cairo.h>
@@ -22,27 +24,9 @@
 #include "text.h"
 #include "gfx.h"
 #include "layer.h"
+#include "main.h"
 #include "cairo.h"
 
-#if 0
-#include <stdlib.h>
-#include <stdio.h>
-#include <assert.h>
-
-#include "util.h"
-#include "style.h"
-#include "text.h"
-#include "fig.h"
-#endif
-
-
-struct cairo_ctx {
-	struct layer layer;	/* must be first */
-	int xo, yo;
-	int scale;
-	cairo_t *cr;
-	cairo_surface_t *s;
-};
 
 /*
  * FIG works with 1/1200 in
@@ -50,28 +34,43 @@ struct cairo_ctx {
  * 1 point = 1/72 in
  */
 
+#define	DEFAULT_SCALE	(72.0 / 1200)
+
+
+struct cairo_ctx {
+	struct layer layer;	/* must be first */
+
+	int xo, yo;
+	float scale;
+
+	cairo_t *cr;
+	cairo_surface_t *s;
+
+	const char *output_name;
+};
+
 
 static inline int cd(struct cairo_ctx *cc, int x)
 {
-	return x / cc->scale;
+	return x * cc->scale;
 }
 
 
 static inline int cx(struct cairo_ctx *cc, int x)
 {
-	return cc->xo + x / cc->scale;
+	return cc->xo + x * cc->scale;
 }
 
 
 static inline int xc(struct cairo_ctx *cc, int x)
 {
-	return (x - cc->xo) * cc->scale;
+	return (x - cc->xo) / cc->scale;
 }
 
 
 static inline int cy(struct cairo_ctx *cc, int y)
 {
-	return cc->yo + y / cc->scale;
+	return cc->yo + y * cc->scale;
 }
 
 
@@ -224,10 +223,25 @@ static const struct gfx_ops real_cairo_ops = {
 static void *cr_init(int argc, char *const *argv)
 {
 	struct cairo_ctx *cc;
+	char c;
 
 	cc = alloc_type(struct cairo_ctx);
 	cc->xo = cc->yo = 0;
-	cc->scale = 5;
+	cc->scale = DEFAULT_SCALE;
+
+	cc->output_name = NULL;
+	while ((c = getopt(argc, argv, "o:s:")) != EOF)
+		switch (c) {
+		case 'o':
+			cc->output_name = optarg;
+			break;
+		case 's':
+			cc->scale = atof(optarg) * DEFAULT_SCALE;
+			break;
+		default:
+			usage(*argv);
+		}
+
 	layer_init(&cc->layer, &real_cairo_ops, cc);
 
 	/* cr_text_width needs *something* to work with */
@@ -269,7 +283,8 @@ static void cr_end(void *ctx)
 	layer_replay(&cc->layer);
 	layer_destroy(&cc->layer);
 
-	cairo_surface_write_to_png(cc->s, "test.png");
+	if (cc->output_name)
+		cairo_surface_write_to_png(cc->s, cc->output_name);
 }
 
 

sch2fig/main.c

@@ -46,7 +46,7 @@ void usage(const char *name)
 "  FIG driver spec:\n"
 "    fig [-t template.fig] [var=value ...]\n"
 "  Cairo driver spec:\n"
-"    cairo\n"
+"    cairo [-o output.png] [-s scale]\n"
     , name);
 	exit(1);
 }