/* * $Id: xlib.c,v 1.1 2006/11/25 17:00:29 matthieu Exp $ * * 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 #include #include 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; }