Initial revisionXORG-STABLE

1 files changed, 399 insertions, 0 deletions

diff --git a/src/xlib.c b/src/xlib.c
new file mode 100644
index 0000000..13e2433
--- /dev/null
+++ b/src/xlib.c
@@ -0,0 +1,399 @@
+/*
+ * $XFree86: xc/lib/Xcursor/xlib.c,v 1.4 2003/02/22 06:16:15 dawes Exp $
+ *
+ * Copyright © 2002 Keith Packard, member of The XFree86 Project, Inc.
+ *
+ * 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, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Keith Packard makes no
+ * representations about the suitability of this software for any purpose.  It
+ * is provided "as is" without express or implied warranty.
+ *
+ * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "xcursorint.h"
+#include <X11/Xlibint.h>
+#include <X11/Xatom.h>
+#include <stdlib.h>
+
+static XcursorBool
+_XcursorFontIsCursor (Display *dpy, Font font)
+{
+    XcursorFontInfo	*fi;
+    XcursorDisplayInfo	*info;
+    XcursorBool		ret;
+    XFontStruct		*fs;
+    int			n;
+    Atom		cursor;
+
+    if (font == dpy->cursor_font)
+	return XcursorTrue;
+
+    info = _XcursorGetDisplayInfo (dpy);
+    if (!info)
+	return XcursorFalse;
+    LockDisplay (dpy);
+    for (fi = info->fonts; fi; fi = fi->next)
+	if (fi->font == font)
+	{
+	    ret = fi->is_cursor_font;
+	    UnlockDisplay (dpy);
+	    return ret;
+	}
+    UnlockDisplay (dpy);
+    ret = XcursorFalse;
+    fs = XQueryFont (dpy, font);
+    if (fs)
+    {
+	cursor = XInternAtom (dpy, "cursor", False);
+	for (n = 0; n < fs->n_properties; n++)
+	    if (fs->properties[n].name == XA_FONT)
+	    {
+		ret = (fs->properties[n].card32 == cursor);
+		break;
+	    }
+    }
+    fi = malloc (sizeof (XcursorFontInfo));
+    if (fi)
+    {
+	fi->font = font;
+	fi->is_cursor_font = ret;
+	LockDisplay (dpy);
+	fi->next = info->fonts;
+	info->fonts = fi;
+	UnlockDisplay (dpy);
+    }
+    return ret;
+}
+
+Cursor
+XcursorTryShapeCursor (Display	    *dpy,
+		       Font	    source_font,
+		       Font	    mask_font,
+		       unsigned int source_char,
+		       unsigned int mask_char,
+		       XColor _Xconst *foreground,
+		       XColor _Xconst *background)
+{
+    Cursor  cursor = None;
+    
+    if (!XcursorSupportsARGB (dpy) && !XcursorGetThemeCore (dpy))
+	return None;
+    
+    if (source_font == mask_font && 
+	_XcursorFontIsCursor (dpy, source_font) &&
+	source_char + 1 == mask_char)
+    {
+	int		size = XcursorGetDefaultSize (dpy);
+	char		*theme = XcursorGetTheme (dpy);
+	XcursorImages   *images = XcursorShapeLoadImages (source_char, theme, size);
+
+	if (images)
+	{
+	    cursor = XcursorImagesLoadCursor (dpy, images);
+	    XcursorImagesDestroy (images);
+	}
+    }
+    return cursor;
+}
+
+void
+XcursorNoticeCreateBitmap (Display	*dpy,
+			   Pixmap	pid,
+			   unsigned int width,
+			   unsigned int height)
+{
+    XcursorDisplayInfo	*info;
+    unsigned long	oldest;
+    unsigned long	now;
+    int			i;
+    int			replace = 0;
+    XcursorBitmapInfo	*bmi;
+
+    if (!XcursorSupportsARGB (dpy) && !XcursorGetThemeCore (dpy))
+	return;
+    
+    if (width > MAX_BITMAP_CURSOR_SIZE || height > MAX_BITMAP_CURSOR_SIZE)
+	return;
+    
+    info = _XcursorGetDisplayInfo (dpy);
+    if (!info)
+	return;
+    
+    LockDisplay (dpy);
+    replace = 0;
+    now = dpy->request;
+    oldest = now;
+    for (i = 0; i < NUM_BITMAPS; i++)
+    {
+	if (!info->bitmaps[i].bitmap)
+	{
+	    replace = i;
+	    break;
+	}
+	if ((long) (now - info->bitmaps[i].sequence) >
+	    (long) (now - oldest))
+	{
+	    replace = i;
+	    oldest = info->bitmaps[i].sequence;
+	}
+    }
+    bmi = &info->bitmaps[replace];
+    bmi->bitmap = pid;
+    bmi->sequence = now;
+    bmi->width = width;
+    bmi->height = height;
+    bmi->has_image = False;
+    UnlockDisplay (dpy);
+}
+
+static XcursorBitmapInfo *
+_XcursorGetBitmap (Display *dpy, Pixmap bitmap)
+{
+    XcursorDisplayInfo	*info = _XcursorGetDisplayInfo (dpy);
+    int			i;
+
+    if (!info)
+	return 0;
+    LockDisplay (dpy);
+    for (i = 0; i < NUM_BITMAPS; i++)
+	if (info->bitmaps[i].bitmap == bitmap)
+	{
+	    info->bitmaps[i].sequence = dpy->request;
+	    UnlockDisplay (dpy);
+	    return &info->bitmaps[i];
+	}
+    UnlockDisplay (dpy);
+    return 0;
+}
+
+static Bool
+_XcursorClientLSB (void)
+{
+    int	    v = 1;
+    return *((char *) &v) == 1;
+}
+
+/* stolen from Xlib */
+static unsigned char const _reverse_byte[0x100] = {
+	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
+	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
+	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
+	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
+	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
+	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
+	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
+	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
+	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
+	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
+	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
+	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
+	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
+	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
+	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
+	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
+	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
+	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
+	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
+	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
+	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
+	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
+	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
+	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
+	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
+	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
+	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
+	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
+	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
+	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
+	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
+	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
+};
+    
+#define RotByte(t,i)    (((t) << (i)) | ((t) >> (8 - (i))))
+
+void
+XcursorImageHash (XImage	  *image,
+		  unsigned char   hash[XCURSOR_BITMAP_HASH_SIZE])
+{
+    int		    i;
+    int		    x, y;
+    unsigned char   *line;
+    unsigned char   t;
+    int		    low_addr;
+    Bool	    bit_swap;
+
+    for (i = 0; i < XCURSOR_BITMAP_HASH_SIZE; i++)
+	hash[i] = 0;
+    /*
+     * Flip byte order on MSB machines where the bitmap_unit isn't
+     * in bytes
+     */
+    low_addr = 0;
+    if (image->bitmap_unit != 8)
+    {
+	if (!_XcursorClientLSB())
+	    switch (image->bitmap_unit) {
+	    case 16:
+		low_addr = 1;
+		break;
+	    case 32:
+		low_addr = 3;
+		break;
+	    }
+    }
+    /*
+     * Flip bit order on MSB images
+     */
+    bit_swap = (image->bitmap_bit_order != LSBFirst);
+    
+    line = (unsigned char *) image->data;
+    i = 0;
+    /*
+     * Compute the hash.  Yes, it might be nice to use
+     * a stronger hash function, but MD5 and SHA1 are both
+     * a bit to expensive in time and space for this,
+     * and cursors are generally small enough that a weak
+     * hash is sufficient to distinguish among them.
+     */
+    for (y = 0; y < image->height; y++)
+    {
+	for (x = 0; x < image->bytes_per_line; x++)
+	{
+	    t = line[x^low_addr];
+	    if (bit_swap)
+		t = _reverse_byte[t];
+	    if (t)
+		hash[(i++) & (XCURSOR_BITMAP_HASH_SIZE - 1)] ^= RotByte (t, y & 7);
+	}
+	line += image->bytes_per_line;
+    }
+}
+
+static Bool
+_XcursorLogDiscover (void)
+{
+    static Bool	been_here;
+    static Bool	log;
+
+    if (!been_here)
+    {
+	been_here = True;
+
+	if (getenv ("XCURSOR_DISCOVER"))
+	    log = True;
+    }
+    return log;
+}
+    
+void
+XcursorNoticePutBitmap (Display	    *dpy,
+			Drawable    draw,
+			XImage	    *image)
+{
+    XcursorBitmapInfo	*bmi;
+    
+    if (!XcursorSupportsARGB (dpy) && !XcursorGetThemeCore (dpy))
+	return;
+    
+    if (image->width > MAX_BITMAP_CURSOR_SIZE || 
+	image->height > MAX_BITMAP_CURSOR_SIZE)
+	return;
+    
+    bmi = _XcursorGetBitmap (dpy, (Pixmap) draw);
+    if (!bmi)
+	return;
+    /*
+     * Make sure the image fills the bitmap
+     */
+    if (image->width != bmi->width || image->height != bmi->height)
+    {
+	bmi->bitmap = 0;
+	return;
+    }
+    /*
+     * If multiple images are placed in the same bitmap,
+     * assume it's not going to be a cursor
+     */
+    if (bmi->has_image)
+    {
+	bmi->bitmap = 0;
+	return;
+    }
+    /*
+     * Make sure the image is valid
+     */
+    if (image->bytes_per_line & ((image->bitmap_unit >> 3) - 1))
+    {
+	bmi->bitmap = 0;
+	return;
+    }
+    /*
+     * Hash the image
+     */
+    XcursorImageHash (image, bmi->hash);
+    /*
+     * Display the hash value and the image if
+     * requested so that users can find out what
+     * cursor name is associated with each image
+     */
+    if (_XcursorLogDiscover())
+    {
+	int x, y;
+	int i;
+	XImage	t = *image;
+
+	XInitImage (&t);
+	
+	printf ("Cursor image name: ");
+	for (i = 0; i < XCURSOR_BITMAP_HASH_SIZE; i++)
+	    printf ("%02x", bmi->hash[i]);
+	printf ("\n");
+	for (y = 0; y < image->height; y++)
+	{
+	    for (x = 0; x < image->width; x++)
+		putchar (XGetPixel (&t, x, y) ? '*' : ' ');
+	    putchar ('\n');
+	}
+    }
+    bmi->has_image = True;
+}
+
+Cursor
+XcursorTryShapeBitmapCursor (Display		*dpy,
+			     Pixmap		source,
+			     Pixmap		mask,
+			     XColor		*foreground,
+			     XColor		*background,
+			     unsigned int	x,
+			     unsigned int	y)
+{
+    XcursorBitmapInfo	*bmi;
+    char		name[8 * XCURSOR_BITMAP_HASH_SIZE];
+    int			i;
+    Cursor		cursor;
+
+    if (!XcursorSupportsARGB (dpy) && !XcursorGetThemeCore (dpy))
+	return None;
+    
+    bmi = _XcursorGetBitmap (dpy, source);
+    if (!bmi || !bmi->has_image)
+	return None;
+    for (i = 0; i < XCURSOR_BITMAP_HASH_SIZE; i++)
+	sprintf (name + 2 * i, "%02x", bmi->hash[i]);
+    cursor = XcursorLibraryLoadCursor (dpy, name);
+    if (_XcursorLogDiscover())
+	printf ("Cursor hash %s returns 0x%x\n", name, (unsigned int) cursor);
+    return cursor;
+}