/*
* $Id$
*
* Copyright © 2002 Keith Packard
*
* 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 (!dpy || !font)
return XcursorFalse;
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 (!dpy || !source_font || !mask_font || !foreground || !background)
return 0;
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 (!dpy)
return;
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;
int i;
if (!dpy || !bitmap)
return NULL;
info = _XcursorGetDisplayInfo (dpy);
if (!info)
return NULL;
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 NULL;
}
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;
if (!image)
return;
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 (!dpy || !image)
return;
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 (!dpy || !foreground || !background)
return 0;
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;
}
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