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