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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2023 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Window/Unix/CursorImpl.hpp>
#include <SFML/Window/Unix/Display.hpp>
#include <X11/cursorfont.h>
#include <X11/Xutil.h>
#include <X11/Xcursor/Xcursor.h>
#include <cassert>
#include <cstdlib>
#include <vector>
namespace sf
{
namespace priv
{
////////////////////////////////////////////////////////////
CursorImpl::CursorImpl() :
m_display(OpenDisplay()),
m_cursor(None)
{
// That's it.
}
////////////////////////////////////////////////////////////
CursorImpl::~CursorImpl()
{
release();
CloseDisplay(m_display);
}
////////////////////////////////////////////////////////////
bool CursorImpl::loadFromPixels(const Uint8* pixels, Vector2u size, Vector2u hotspot)
{
release();
if (isColorCursorSupported())
return loadFromPixelsARGB(pixels, size, hotspot);
else
return loadFromPixelsMonochrome(pixels, size, hotspot);
}
////////////////////////////////////////////////////////////
bool CursorImpl::loadFromPixelsARGB(const Uint8* pixels, Vector2u size, Vector2u hotspot)
{
// Create cursor image, convert from RGBA to ARGB.
XcursorImage* cursorImage = XcursorImageCreate(static_cast<int>(size.x), static_cast<int>(size.y));
cursorImage->xhot = hotspot.x;
cursorImage->yhot = hotspot.y;
const std::size_t numPixels = size.x * size.y;
for (std::size_t pixelIndex = 0; pixelIndex < numPixels; ++pixelIndex)
{
cursorImage->pixels[pixelIndex] = static_cast<Uint32>(pixels[pixelIndex * 4 + 2] +
(pixels[pixelIndex * 4 + 1] << 8) +
(pixels[pixelIndex * 4 + 0] << 16) +
(pixels[pixelIndex * 4 + 3] << 24));
}
// Create the cursor.
m_cursor = XcursorImageLoadCursor(m_display, cursorImage);
// Free the resources
XcursorImageDestroy(cursorImage);
// We assume everything went fine...
return true;
}
////////////////////////////////////////////////////////////
bool CursorImpl::loadFromPixelsMonochrome(const Uint8* pixels, Vector2u size, Vector2u hotspot)
{
// Convert the image into a bitmap (monochrome!).
// The bit data is stored packed into bytes. If the number of pixels on each row of the image
// does not fit exactly into (width/8) bytes, one extra byte is allocated at the end of each
// row to store the extra pixels.
std::size_t packedWidth = (size.x + 7) / 8;
std::size_t bytes = packedWidth * size.y;
std::vector<Uint8> mask(bytes, 0); // Defines which pixel is opaque (1) or transparent (0).
std::vector<Uint8> data(bytes, 0); // Defines which pixel is white (1) or black (0).
for (std::size_t j = 0; j < size.y; ++j)
{
for (std::size_t i = 0; i < size.x; ++i)
{
std::size_t pixelIndex = i + j * size.x;
std::size_t byteIndex = i / 8 + j * packedWidth;
std::size_t bitIndex = i % 8;
// Turn on pixel that are not transparent
Uint8 opacity = pixels[pixelIndex * 4 + 3] > 0 ? 1 : 0;
mask[byteIndex] |= static_cast<Uint8>(opacity << bitIndex);
// Choose between black/background & white/foreground color for each pixel,
// based on the pixel color intensity: on average, if a channel is "active"
// at 50%, the bit is white.
int intensity = (pixels[pixelIndex * 4 + 0] + pixels[pixelIndex * 4 + 1] + pixels[pixelIndex * 4 + 2]) / 3;
Uint8 bit = intensity > 128 ? 1 : 0;
data[byteIndex] |= static_cast<Uint8>(bit << bitIndex);
}
}
Pixmap maskPixmap = XCreateBitmapFromData(m_display, XDefaultRootWindow(m_display),
reinterpret_cast<char*>(&mask[0]), size.x, size.y);
Pixmap dataPixmap = XCreateBitmapFromData(m_display, XDefaultRootWindow(m_display),
reinterpret_cast<char*>(&data[0]), size.x, size.y);
// Define the foreground color as white and the background as black.
XColor fg, bg;
fg.red = 0xFFFF;
fg.blue = 0xFFFF;
fg.green = 0xFFFF;
bg.red = 0x0000;
bg.blue = 0x0000;
bg.green = 0x0000;
// Create the monochrome cursor.
m_cursor = XCreatePixmapCursor(m_display,
dataPixmap, maskPixmap,
&fg, &bg,
hotspot.x, hotspot.y);
// Free the resources
XFreePixmap(m_display, dataPixmap);
XFreePixmap(m_display, maskPixmap);
// We assume everything went fine...
return true;
}
////////////////////////////////////////////////////////////
bool CursorImpl::loadFromSystem(Cursor::Type type)
{
release();
unsigned int shape;
switch (type)
{
default: return false;
case Cursor::Arrow: shape = XC_arrow; break;
case Cursor::Wait: shape = XC_watch; break;
case Cursor::Text: shape = XC_xterm; break;
case Cursor::Hand: shape = XC_hand2; break;
case Cursor::SizeHorizontal: shape = XC_sb_h_double_arrow; break;
case Cursor::SizeVertical: shape = XC_sb_v_double_arrow; break;
case Cursor::SizeLeft: shape = XC_left_side; break;
case Cursor::SizeRight: shape = XC_right_side; break;
case Cursor::SizeTop: shape = XC_top_side; break;
case Cursor::SizeBottom: shape = XC_bottom_side; break;
case Cursor::SizeTopLeft: shape = XC_top_left_corner; break;
case Cursor::SizeBottomRight: shape = XC_bottom_right_corner; break;
case Cursor::SizeBottomLeft: shape = XC_bottom_left_corner; break;
case Cursor::SizeTopRight: shape = XC_top_right_corner; break;
case Cursor::SizeAll: shape = XC_fleur; break;
case Cursor::Cross: shape = XC_crosshair; break;
case Cursor::Help: shape = XC_question_arrow; break;
case Cursor::NotAllowed: shape = XC_X_cursor; break;
}
m_cursor = XCreateFontCursor(m_display, shape);
return true;
}
////////////////////////////////////////////////////////////
bool CursorImpl::isColorCursorSupported()
{
return XcursorSupportsARGB(m_display);
}
////////////////////////////////////////////////////////////
void CursorImpl::release()
{
if (m_cursor != None)
{
XFreeCursor(m_display, m_cursor);
m_cursor = None;
}
}
} // namespace priv
} // namespace sf
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