void EventsManager::changeCursor() {
if (_cursorSprites) {
MSprite *cursor = _cursorSprites->getFrame(_cursorId - 1);
assert(cursor->w == cursor->h);
byte transIndex = cursor->getTransparencyIndex();
// Check for hotspot indication pixels along the right-hand and bottom
// row. Put together, these give the cursor's hotspot x,y
int hotspotX = 0, hotspotY = 0;
const byte *cursorData = (const byte *)cursor->getPixels();
for (int idx = 0; idx < cursor->w; ++idx) {
if (cursorData[(cursor->h - 1) * cursor->w + idx] != transIndex)
hotspotX = idx;
if (cursorData[(idx + 1) * cursor->w - 1] != transIndex)
hotspotY = idx;
}
// Reduce the cursor data to remove the last column from each row, since
// the cursor routines don't have a pitch option
byte *destCursor = new byte[(cursor->w - 1) * (cursor->h - 1)];
const byte *srcP = cursorData;
byte *destP = destCursor;
for (int idx = 0; idx < (cursor->h - 1); ++idx) {
Common::copy(srcP, srcP + cursor->w - 1, destP);
srcP += cursor->w;
destP += cursor->w - 1;
}
// Set the raw cursor data to use
CursorMan.replaceCursor(destCursor, cursor->w - 1, cursor->h - 1,
hotspotX, hotspotY, transIndex);
showCursor();
delete[] destCursor;
}
}
