more files

src/cmd/postscript/common/bbox.c

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+/*
+ *
+ * Boundingbox code for PostScript translators. The boundingbox for each page
+ * is accumulated in bbox - the one for the whole document goes in docbbox. A
+ * call to writebbox() puts out an appropriate comment, updates docbbox, and
+ * resets bbox for the next page. The assumption made at the end of writebbox()
+ * is that we're really printing the current page only if output is now going
+ * to stdout - a valid assumption for all supplied translators. Needs the math
+ * library.
+ *
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <math.h>
+
+#include "comments.h"			/* PostScript file structuring comments */
+#include "gen.h"			/* a few general purpose definitions */
+#include "ext.h"			/* external variable declarations */
+
+typedef struct bbox {
+	int	set;
+	double	llx, lly;
+	double	urx, ury;
+} Bbox;
+
+Bbox	bbox = {FALSE, 0.0, 0.0, 0.0, 0.0};
+Bbox	docbbox = {FALSE, 0.0, 0.0, 0.0, 0.0};
+
+double	ctm[6] = {1.0, 0.0, 0.0, 1.0, 0.0, 0.0};
+double	matrix1[6], matrix2[6];
+
+/*****************************************************************************/
+
+cover(x, y)
+
+    double	x, y;
+
+{
+
+/*
+ *
+ * Adds point (x, y) to bbox. Coordinates are in user space - the transformation
+ * to default coordinates happens in writebbox().
+ *
+ */
+
+    if ( bbox.set == FALSE ) {
+	bbox.llx = bbox.urx = x;
+	bbox.lly = bbox.ury = y;
+	bbox.set = TRUE;
+    } else {
+	if ( x < bbox.llx )
+	    bbox.llx = x;
+	if ( y < bbox.lly )
+	    bbox.lly = y;
+	if ( x > bbox.urx )
+	    bbox.urx = x;
+	if ( y > bbox.ury )
+	    bbox.ury = y;
+    }	/* End else */
+
+}   /* End of cover */
+
+/*****************************************************************************/
+
+writebbox(fp, keyword, slop)
+
+    FILE	*fp;			/* the comment is written here */
+    char	*keyword;		/* the boundingbox comment string */
+    int		slop;			/* expand (or contract?) the box a bit */
+
+{
+
+    Bbox	ubbox;			/* user space bounding box */
+    double	x, y;
+
+/*
+ *
+ * Transforms the numbers in the bbox[] using ctm[], adjusts the corners a bit
+ * (depending on slop) and then writes comment. If *keyword is BoundingBox use
+ * whatever's been saved in docbbox, otherwise assume the comment is just for
+ * the current page.
+ *
+ */
+
+    if ( strcmp(keyword, BOUNDINGBOX) == 0 )
+	bbox = docbbox;
+
+    if ( bbox.set == TRUE ) {
+	ubbox = bbox;
+	bbox.set = FALSE;		/* so cover() works properly */
+	x = ctm[0] * ubbox.llx + ctm[2] * ubbox.lly + ctm[4];
+	y = ctm[1] * ubbox.llx + ctm[3] * ubbox.lly + ctm[5];
+	cover(x, y);
+	x = ctm[0] * ubbox.llx + ctm[2] * ubbox.ury + ctm[4];
+	y = ctm[1] * ubbox.llx + ctm[3] * ubbox.ury + ctm[5];
+	cover(x, y);
+	x = ctm[0] * ubbox.urx + ctm[2] * ubbox.ury + ctm[4];
+	y = ctm[1] * ubbox.urx + ctm[3] * ubbox.ury + ctm[5];
+	cover(x, y);
+	x = ctm[0] * ubbox.urx + ctm[2] * ubbox.lly + ctm[4];
+	y = ctm[1] * ubbox.urx + ctm[3] * ubbox.lly + ctm[5];
+	cover(x, y);
+	bbox.llx -= slop + 0.5;
+	bbox.lly -= slop + 0.5;
+	bbox.urx += slop + 0.5;
+	bbox.ury += slop + 0.5;
+	fprintf(fp, "%s %d %d %d %d\n", keyword, (int)bbox.llx, (int)bbox.lly,(int)bbox.urx, (int)bbox.ury);
+	bbox = ubbox;
+    }	/* End if */
+
+    resetbbox((fp == stdout) ? TRUE : FALSE);
+
+}   /* End of writebbox */
+
+/*****************************************************************************/
+
+resetbbox(output)
+
+    int		output;
+
+{
+
+/*
+ *
+ * Adds bbox to docbbox and resets bbox for the next page. Only update docbbox
+ * if we really did output on the last page.
+ *
+ */
+
+    if ( docbbox.set == TRUE ) {
+	cover(docbbox.llx, docbbox.lly);
+	cover(docbbox.urx, docbbox.ury);
+    }	/* End if */
+
+    if ( output == TRUE ) {
+	docbbox = bbox;
+	docbbox.set = TRUE;
+    }	/* End if */
+
+    bbox.set = FALSE;
+
+}   /* End of resetbbox */
+
+/*****************************************************************************/
+
+scale(sx, sy)
+
+    double	sx, sy;
+
+{
+
+/*
+ *
+ * Scales the default matrix.
+ *
+ */
+
+    matrix1[0] = sx;
+    matrix1[1] = 0;
+    matrix1[2] = 0;
+    matrix1[3] = sy;
+    matrix1[4] = 0;
+    matrix1[5] = 0;
+
+    concat(matrix1);
+
+}   /* End of scale */
+
+/*****************************************************************************/
+
+translate(tx, ty)
+
+    double	tx, ty;
+
+{
+
+/*
+ *
+ * Translates the default matrix.
+ *
+ */
+
+    matrix1[0] = 1.0;
+    matrix1[1] = 0.0;
+    matrix1[2] = 0.0;
+    matrix1[3] = 1.0;
+    matrix1[4] = tx;
+    matrix1[5] = ty;
+
+    concat(matrix1);
+
+}   /* End of translate */
+
+/*****************************************************************************/
+
+rotate(angle)
+
+    double	angle;
+
+{
+
+/*
+ *
+ * Rotates by angle degrees.
+ *
+ */
+
+    angle *= 3.1416 / 180;
+
+    matrix1[0] = matrix1[3] = cos(angle);
+    matrix1[1] = sin(angle);
+    matrix1[2] = -matrix1[1];
+    matrix1[4] = 0.0;
+    matrix1[5] = 0.0;
+
+    concat(matrix1);
+
+}   /* End of rotate */
+
+/*****************************************************************************/
+
+concat(m1)
+
+    double	m1[];
+
+{
+
+    double	m2[6];
+
+/*
+ *
+ * Replaces the ctm[] by the result of the matrix multiplication m1[] x ctm[].
+ *
+ */
+
+    m2[0] = ctm[0];
+    m2[1] = ctm[1];
+    m2[2] = ctm[2];
+    m2[3] = ctm[3];
+    m2[4] = ctm[4];
+    m2[5] = ctm[5];
+
+    ctm[0] = m1[0] * m2[0] + m1[1] * m2[2];
+    ctm[1] = m1[0] * m2[1] + m1[1] * m2[3];
+    ctm[2] = m1[2] * m2[0] + m1[3] * m2[2];
+    ctm[3] = m1[2] * m2[1] + m1[3] * m2[3];
+    ctm[4] = m1[4] * m2[0] + m1[5] * m2[2] + m2[4];
+    ctm[5] = m1[4] * m2[1] + m1[5] * m2[3] + m2[5];
+
+}   /* End of concat */
+
+/*****************************************************************************/
+