void X11Window::setMouseCursor(const std::string& file, const Point& hotSpot)
{
std::stringstream fin;
g_resources.loadFile(file, fin);
apng_data apng;
if(load_apng(fin, &apng) != 0) {
g_logger.traceError(stdext::format("unable to load png file %s", file));
return;
}
if(apng.bpp != 4) {
g_logger.error("the cursor png must have 4 channels");
free_apng(&apng);
return;
}
if(apng.width != 32|| apng.height != 32) {
g_logger.error("the cursor png must have 32x32 dimension");
free_apng(&apng);
return;
}
if(m_cursor != None)
restoreMouseCursor();
int width = apng.width;
int height = apng.height;
int numbits = width * height;
int numbytes = (width * height)/8;
XColor bg, fg;
bg.red = 255 << 8;
bg.green = 255 << 8;
bg.blue = 255 << 8;
fg.red = 0;
fg.green = 0;
fg.blue = 0;
std::vector<uchar> mapBits(numbytes, 0);
std::vector<uchar> maskBits(numbytes, 0);
for(int i=0;i<numbits;++i) {
uint32 rgba = stdext::readLE32(apng.pdata + i*4);
if(rgba == 0xffffffff) { //white, background
LSB_BIT_SET(maskBits, i);
} else if(rgba == 0xff000000) { //black, foreground
LSB_BIT_SET(mapBits, i);
LSB_BIT_SET(maskBits, i);
} //otherwise 0x00000000 => alpha
}
free_apng(&apng);
Pixmap cp = XCreateBitmapFromData(m_display, m_window, (char*)&mapBits[0], width, height);
Pixmap mp = XCreateBitmapFromData(m_display, m_window, (char*)&maskBits[0], width, height);
m_cursor = XCreatePixmapCursor(m_display, cp, mp, &fg, &bg, hotSpot.x, hotSpot.y);
XDefineCursor(m_display, m_window, m_cursor);
XFreePixmap(m_display, cp);
XFreePixmap(m_display, mp);
}
int X11Window::internalLoadMouseCursor(const ImagePtr& image, const Point& hotSpot)
{
int width = image->getWidth();
int height = image->getHeight();
int numbits = width * height;
int numbytes = (width * height)/8;
XColor bg, fg;
bg.red = 255 << 8;
bg.green = 255 << 8;
bg.blue = 255 << 8;
fg.red = 0;
fg.green = 0;
fg.blue = 0;
std::vector<uchar> mapBits(numbytes, 0);
std::vector<uchar> maskBits(numbytes, 0);
for(int i=0;i<numbits;++i) {
uint32 rgba = stdext::readULE32(image->getPixelData() + i*4);
if(rgba == 0xffffffff) { //white, background
LSB_BIT_SET(maskBits, i);
} else if(rgba == 0xff000000) { //black, foreground
LSB_BIT_SET(mapBits, i);
LSB_BIT_SET(maskBits, i);
} //otherwise 0x00000000 => alpha
}
Pixmap cp = XCreateBitmapFromData(m_display, m_window, (char*)&mapBits[0], width, height);
Pixmap mp = XCreateBitmapFromData(m_display, m_window, (char*)&maskBits[0], width, height);
Cursor cursor = XCreatePixmapCursor(m_display, cp, mp, &fg, &bg, hotSpot.x, hotSpot.y);
XFreePixmap(m_display, cp);
XFreePixmap(m_display, mp);
m_cursors.push_back(cursor);
return m_cursors.size()-1;
}