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pdf: set line width according to -w option

Tested by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/pdf.c

+++ b/pdf.c

@@ -12,6 +12,7 @@

 static char pdf_author[256];	/* document author */

 static int pdf_width;		/* page width */

 static int pdf_height;		/* page height */

+static int pdf_lwid;		/* line width in thousands of ems */

 static int pdf_pages;		/* pages object id */

 static int pdf_root;		/* root object id */

 static int pdf_pos;		/* current pdf file offset */

@@ -866,9 +867,11 @@

 void drawend(int close, int fill)

 {

+	int lwid = pdf_lwid * o_s;

 	if (draw_path)

 		return;

 	draw_point = 0;

+	sbuf_printf(pg, "%d.%03d w\n", lwid / 1000, lwid % 1000);	/* line width */

 	if (!fill)		/* stroking color */

 		sbuf_printf(pg, "%s RG\n", pdfcolor(o_m));

 	if (fill)

@@ -960,6 +963,7 @@

 	pdfout("%%PDF-1.6\n\n");

 	pdf_width = (pagewidth * 72 + 127) / 254;

 	pdf_height = (pageheight * 72 + 127) / 254;

+	pdf_lwid = linewidth;

 }

 void doctrailer(int pages)