Initial revisionXORG-STABLE

2 files changed, 201 insertions, 0 deletions

diff --git a/RenderLogo.c b/RenderLogo.c
new file mode 100644
index 0000000..ce8c462
--- /dev/null
+++ b/RenderLogo.c
@@ -0,0 +1,163 @@
+/* $Xorg: DrawLogo.c,v 1.4 2001/02/09 02:03:52 xorgcvs Exp $ */
+
+/*
+
+Copyright 1988, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+/* $XFree86: xc/programs/xlogo/RenderLogo.c,v 1.2 2002/10/19 19:15:32 herrb Exp $ */
+
+#include <stdio.h>
+#include <math.h>
+
+#include <X11/Xlib.h>  
+#include <X11/extensions/Xrender.h>
+
+#include "RenderLogo.h"
+
+typedef struct _XLineDouble {
+    XPointDouble  p1, p2;
+} XLineDouble;
+
+static void
+intersect(XLineDouble *l1, XLineDouble *l2, XPointDouble *intersection);
+
+/*
+ *  Draw the "official" X Window System Logo, designed by Danny Chong
+ *
+ *  Written by Ollie Jones, Apollo Computer
+ *
+ *  Does some fancy stuff to make the logo look acceptable even
+ *  if it is tiny.  Also makes the various linear elements of
+ *  the logo line up as well as possible considering rasterization.
+ *
+ *  Munged to draw anti-aliased logo using Render extension.
+ *  Carl Worth, 2002-05-16
+ */
+void
+RenderLogo(Display *dpy, int op, Picture src, Picture dst, XRenderPictFormat *maskFormat,
+	   int x, int y, unsigned int width, unsigned int height)
+{
+    unsigned int size;
+    double thin, thick, gap, d31;
+    XPointDouble poly[6];
+    XLineDouble thick_left, thick_right, thin_left, thin_right, gap_left, gap_right;
+
+    /* for now, do a centered even-sized square, at least for now */
+    size = width;
+    if (height < width)
+	 size = height;
+    size &= ~1;
+    x += (width - size) >> 1;
+    y += (height - size) >> 1;
+
+    thin = (size / 11.0);
+    thick = (size / 4.0);
+    gap = thin / 4.0;
+    d31 = thin + thin + gap;
+
+    thick_left.p1.x = x;		thick_left.p1.y = y;
+    thick_left.p2.x = x + size - thick;	thick_left.p2.y = y + size;
+
+    thick_right.p1.x = x + thick;	thick_right.p1.y = y;
+    thick_right.p2.x = x + size;	thick_right.p2.y = y + size;
+
+    thin_left.p1.x = x + size-d31;	thin_left.p1.y = y;
+    thin_left.p2.x = x + 0;		thin_left.p2.y = y + size;
+
+    thin_right.p1.x = x + size;		thin_right.p1.y = y;
+    thin_right.p2.x = x + d31;		thin_right.p2.y = y + size;
+
+    gap_left.p1.x = x + size-( thin+gap);	gap_left.p1.y = y;
+    gap_left.p2.x = x + thin;			gap_left.p2.y = y + size;
+
+    gap_right.p1.x = x + size- thin;	gap_right.p1.y = y;
+    gap_right.p2.x = x + thin + gap;	gap_right.p2.y = y + size;
+
+    poly[0] = thick_left.p1;
+    poly[1] = thick_right.p1;
+    intersect(&thick_right, &gap_left, &poly[2]);
+    poly[3] = gap_left.p2;
+    poly[4] = thin_left.p2;
+    intersect(&thick_left, &thin_left, &poly[5]);
+
+    XRenderCompositeDoublePoly(dpy, op,
+			       src, dst, maskFormat,
+			       0, 0, 0, 0,
+			       poly, 6, 0);
+
+    poly[0] = thin_right.p1;
+    poly[1] = gap_right.p1;
+    intersect(&thick_left, &gap_right, &poly[2]);
+    poly[3] = thick_left.p2;
+    poly[4] = thick_right.p2;
+    intersect(&thick_right, &thin_right, &poly[5]);
+
+    XRenderCompositeDoublePoly(dpy, op,
+			       src, dst, maskFormat,
+			       0, 0, 0, 0,
+			       poly, 6, 0);
+}
+
+static double
+compute_inverse_slope (XLineDouble *l)
+{
+    return ((l->p2.x - l->p1.x) / 
+	    (l->p2.y - l->p1.y));
+}
+
+static double
+compute_x_intercept(XLineDouble *l, double inverse_slope)
+{
+    return (l->p1.x) - inverse_slope * l->p1.y;
+}
+
+static void
+intersect(XLineDouble *l1, XLineDouble *l2, XPointDouble *intersection)
+{
+    double check;
+    /*
+     * x = m1y + b1
+     * x = m2y + b2
+     * m1y + b1 = m2y + b2
+     * y * (m1 - m2) = b2 - b1
+     * y = (b2 - b1) / (m1 - m2)
+     */
+    double  m1 = compute_inverse_slope (l1);
+    double  b1 = compute_x_intercept (l1, m1);
+    double  m2 = compute_inverse_slope (l2);
+    double  b2 = compute_x_intercept (l2, m2);
+
+    intersection->y = (b2 - b1) / (m1 - m2);
+    intersection->x = m1 * intersection->y + b1;
+
+    check = m2 * intersection->y + b2;
+    if (fabs(check - intersection->x) > (1/(double)(1<<16))) {
+#ifdef __GNUC__
+	fprintf(stderr, "%s: intersection is off by: %f\n", __FUNCTION__, fabs(check - intersection->x));
+#else
+	fprintf(stderr, "intersect: intersection is off by %f\n", fabs(check - instersection->x));
+#endif
+    }
+}
+
diff --git a/RenderLogo.h b/RenderLogo.h
new file mode 100644
index 0000000..4d6b8cb
--- /dev/null
+++ b/RenderLogo.h
@@ -0,0 +1,38 @@
+/* $Xorg: Logo.h,v 1.4 2001/02/09 02:05:54 xorgcvs Exp $ */
+/*
+
+Copyright 1988, 1990, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+/* $XFree86: xc/programs/xlogo/RenderLogo.h,v 1.2 2002/07/01 02:26:04 tsi Exp $ */
+
+#ifndef _RenderLogo_h
+#define _RenderLogo_h
+
+void
+RenderLogo(Display *dpy, int op, Picture src, Picture dst, XRenderPictFormat *maskFormat,
+	   int x, int y, unsigned int width, unsigned int height);
+
+#endif /* _RenderLogo_h */