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118 lines
3.2 KiB
Plaintext
118 lines
3.2 KiB
Plaintext
--- src/geist_line.c.orig Sun Oct 22 00:05:45 2000
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+++ src/geist_line.c Sat Feb 12 20:39:50 2005
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@@ -406,6 +406,114 @@
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}
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+/*
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+ * Recent versions of Imlib2 lack imlib_clip_line() function, which was
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+ * around at Imlib2-1.1.0 times. Dig it and some related stuff from
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+ * old sources and paste here, so we're buildable again with new Imlib2.
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+ */
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+
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+enum { TOP = 0x1, BOTTOM = 0x2, RIGHT = 0x4, LEFT = 0x8 };
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+
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+unsigned int
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+__imlib_comp_outcode(double x, double y, double xmin,
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+ double xmax, double ymin, double ymax)
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+{
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+ unsigned int code = 0;
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+
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+ if (y > ymax)
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+ code |= TOP;
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+ else if (y < ymin)
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+ code |= BOTTOM;
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+ if (x > xmax)
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+ code |= RIGHT;
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+ else if (x < xmin)
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+ code |= LEFT;
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+ return code;
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+}
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+
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+int
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+imlib_clip_line(int x0, int y0, int x1, int y1, int xmin, int xmax, int ymin,
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+ int ymax, int *clip_x0, int *clip_y0, int *clip_x1,
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+ int *clip_y1)
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+{
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+ unsigned int outcode0, outcode1, outcode_out;
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+ unsigned char accept = FALSE, done = FALSE;
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+ double dx0, dy0, dx1, dy1;
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+
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+ dx0 = x0;
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+ dx1 = x1;
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+ dy0 = y0;
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+ dy1 = y1;
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+
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+ outcode0 = __imlib_comp_outcode(dx0, dy0, xmin, xmax, ymin, ymax);
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+ outcode1 = __imlib_comp_outcode(dx1, dy1, xmin, xmax, ymin, ymax);
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+
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+ do
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+ {
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+ if (!(outcode0 | outcode1))
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+ {
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+ accept = TRUE;
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+ done = TRUE;
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+ }
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+ else if (outcode0 & outcode1)
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+ done = TRUE;
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+ else
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+ {
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+ double x, y;
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+
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+ outcode_out = outcode0 ? outcode0 : outcode1;
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+ if (outcode_out & TOP)
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+ {
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+ x = dx0 + (dx1 - dx0) * ((double)ymax - dy0) / (dy1 - dy0);
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+ y = ymax;
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+ }
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+ else if (outcode_out & BOTTOM)
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+ {
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+ x = dx0 + (dx1 - dx0) * ((double)ymin - dy0) / (dy1 - dy0);
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+ y = ymin;
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+ }
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+ else if (outcode_out & RIGHT)
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+ {
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+ y = dy0 + (dy1 - dy0) * ((double)xmax - dx0) / (dx1 - dx0);
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+ x = xmax;
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+ }
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+ else
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+ {
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+ y = dy0 + (dy1 - dy0) * ((double)xmin - dx0) / (dx1 - dx0);
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+ x = xmin;
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+ }
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+ if (outcode_out == outcode0)
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+ {
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+ dx0 = x;
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+ dy0 = y;
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+ outcode0 =
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+ __imlib_comp_outcode(dx0, dy0, xmin, xmax, ymin, ymax);
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+ }
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+ else
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+ {
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+ dx1 = x;
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+ dy1 = y;
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+ outcode1 =
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+ __imlib_comp_outcode(dx1, dy1, xmin, xmax, ymin, ymax);
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+ }
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+ }
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+ }
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+ while (done == FALSE);
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+
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+ /* round up before converting down to ints */
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+ dx0 = floor(dx0 + 0.5);
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+ dx1 = floor(dx1 + 0.5);
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+ dy0 = floor(dy0 + 0.5);
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+ dy1 = floor(dy1 + 0.5);
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+
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+ *clip_x0 = dx0;
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+ *clip_y0 = dy0;
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+ *clip_x1 = dx1;
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+ *clip_y1 = dy1;
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+
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+ return accept;
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+}
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+
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int
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geist_line_get_clipped_line(geist_line * line, int *clip_x0, int *clip_y0,
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int *clip_x1, int *clip_y1)
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