diff options
Diffstat (limited to 'src/xlib.c')
| -rw-r--r-- | src/xlib.c | 399 |
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; +} |