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kwin/effects/screenshot/screenshot.cpp
Martin Gräßlin 10c07080bb Notify effects when the screen gets locked 
EffectsHandlerImpl starts to monitor DBus for the screen being locked and
provides this information to the Effect system by allowing them to ask
whether the screen is currently locked and by emitting a signal when the
screen gets locked/unlocked.

This information is needed to ensure that no private data is shown on the
screen. The following effects are adjusted:
* taskbar thumbnails
* thumbnail aside
* mouse mark
* screen shot

BUG: 255712
FIXED-IN: 4.11
REVIEW: 108670
2013-02-07 10:23:30 +01:00

367 lines
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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2010 Martin Gräßlin <kde@martin-graesslin.com>
Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "screenshot.h"
#include <kwinglutils.h>
#include <kwinxrenderutils.h>
#include <KDE/KDebug>
#include <KDE/KTemporaryFile>
#include <QtDBus/QDBusConnection>
#include <QtCore/QVarLengthArray>
#include <QtGui/QPainter>
#include <X11/extensions/Xfixes.h>
#include <QX11Info>
namespace KWin
{
KWIN_EFFECT(screenshot, ScreenShotEffect)
KWIN_EFFECT_SUPPORTED(screenshot, ScreenShotEffect::supported())
bool ScreenShotEffect::supported()
{
return effects->compositingType() == XRenderCompositing ||
(effects->isOpenGLCompositing() && GLRenderTarget::supported());
}
ScreenShotEffect::ScreenShotEffect()
: m_scheduledScreenshot(0)
{
connect ( effects, SIGNAL(windowClosed(KWin::EffectWindow*)), SLOT(windowClosed(KWin::EffectWindow*)) );
QDBusConnection::sessionBus().registerObject("/Screenshot", this, QDBusConnection::ExportScriptableContents);
QDBusConnection::sessionBus().registerService("org.kde.kwin.Screenshot");
}
ScreenShotEffect::~ScreenShotEffect()
{
QDBusConnection::sessionBus().unregisterObject("/Screenshot");
QDBusConnection::sessionBus().unregisterService("org.kde.kwin.Screenshot");
}
void ScreenShotEffect::postPaintScreen()
{
effects->postPaintScreen();
if (m_scheduledScreenshot) {
WindowPaintData d(m_scheduledScreenshot);
double left = 0;
double top = 0;
double right = m_scheduledScreenshot->width();
double bottom = m_scheduledScreenshot->height();
if (m_scheduledScreenshot->hasDecoration() && m_type & INCLUDE_DECORATION) {
foreach (const WindowQuad & quad, d.quads) {
// we need this loop to include the decoration padding
left = qMin(left, quad.left());
top = qMin(top, quad.top());
right = qMax(right, quad.right());
bottom = qMax(bottom, quad.bottom());
}
} else if (m_scheduledScreenshot->hasDecoration()) {
WindowQuadList newQuads;
left = m_scheduledScreenshot->width();
top = m_scheduledScreenshot->height();
right = 0;
bottom = 0;
foreach (const WindowQuad & quad, d.quads) {
if (quad.type() == WindowQuadContents) {
newQuads << quad;
left = qMin(left, quad.left());
top = qMin(top, quad.top());
right = qMax(right, quad.right());
bottom = qMax(bottom, quad.bottom());
}
}
d.quads = newQuads;
}
const int width = right - left;
const int height = bottom - top;
bool validTarget = true;
QScopedPointer<GLTexture> offscreenTexture;
QScopedPointer<GLRenderTarget> target;
if (effects->isOpenGLCompositing()) {
int w = width;
int h = height;
if (!GLTexture::NPOTTextureSupported()) {
w = nearestPowerOfTwo(w);
h = nearestPowerOfTwo(h);
}
offscreenTexture.reset(new GLTexture(w, h));
offscreenTexture->setFilter(GL_LINEAR);
offscreenTexture->setWrapMode(GL_CLAMP_TO_EDGE);
target.reset(new GLRenderTarget(*offscreenTexture));
validTarget = target->valid();
}
if (validTarget) {
d.setXTranslation(-m_scheduledScreenshot->x() - left);
d.setYTranslation(-m_scheduledScreenshot->y() - top);
// render window into offscreen texture
int mask = PAINT_WINDOW_TRANSFORMED | PAINT_WINDOW_TRANSLUCENT;
QImage img;
if (effects->isOpenGLCompositing()) {
GLRenderTarget::pushRenderTarget(target.data());
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.0, 0.0, 0.0, 1.0);
setMatrix(offscreenTexture->width(), offscreenTexture->height());
effects->drawWindow(m_scheduledScreenshot, mask, infiniteRegion(), d);
restoreMatrix();
// copy content from framebuffer into image
img = QImage(QSize(width, height), QImage::Format_ARGB32);
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)img.bits());
GLRenderTarget::popRenderTarget();
ScreenShotEffect::convertFromGLImage(img, width, height);
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (effects->compositingType() == XRenderCompositing) {
setXRenderOffscreen(true);
effects->drawWindow(m_scheduledScreenshot, mask, QRegion(0, 0, width, height), d);
if (xRenderOffscreenTarget())
img = xRenderOffscreenTarget()->toImage().copy(0, 0, width, height);
setXRenderOffscreen(false);
}
#endif
if (m_type & INCLUDE_CURSOR) {
grabPointerImage(img, m_scheduledScreenshot->x() + left, m_scheduledScreenshot->y() + top);
}
m_lastScreenshot = QPixmap::fromImage(img);
if (m_lastScreenshot.handle() == 0) {
Pixmap xpix = XCreatePixmap(display(), rootWindow(), m_lastScreenshot.width(),
m_lastScreenshot.height(), 32);
m_lastScreenshot = QPixmap::fromX11Pixmap(xpix, QPixmap::ExplicitlyShared);
QPainter p(&m_lastScreenshot);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.drawImage(QPoint(0, 0), img);
p.end();
XSync(display(), False);
}
emit screenshotCreated(m_lastScreenshot.handle());
}
m_scheduledScreenshot = NULL;
}
}
static QMatrix4x4 s_origProjection;
static QMatrix4x4 s_origModelview;
void ScreenShotEffect::setMatrix(int width, int height)
{
QMatrix4x4 projection;
QMatrix4x4 identity;
projection.ortho(QRect(0, 0, width, height));
if (effects->compositingType() == OpenGL2Compositing) {
ShaderBinder binder(ShaderManager::GenericShader);
GLShader *shader = binder.shader();
s_origProjection = shader->getUniformMatrix4x4("projection");
s_origModelview = shader->getUniformMatrix4x4("modelview");
shader->setUniform(GLShader::ProjectionMatrix, projection);
shader->setUniform(GLShader::ModelViewMatrix, identity);
} else if (effects->compositingType() == OpenGL1Compositing) {
#ifdef KWIN_HAVE_OPENGL_1
glMatrixMode(GL_PROJECTION);
glPushMatrix();
loadMatrix(projection);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
#endif
}
}
void ScreenShotEffect::restoreMatrix()
{
if (effects->compositingType() == OpenGL2Compositing) {
ShaderBinder binder(ShaderManager::GenericShader);
GLShader *shader = binder.shader();
shader->setUniform(GLShader::ProjectionMatrix, s_origProjection);
shader->setUniform(GLShader::ModelViewMatrix, s_origModelview);
} else if (effects->compositingType() == OpenGL1Compositing) {
#ifdef KWIN_HAVE_OPENGL_1
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
#endif
}
}
void ScreenShotEffect::screenshotWindowUnderCursor(int mask)
{
m_type = (ScreenShotType)mask;
const QPoint cursor = effects->cursorPos();
EffectWindowList order = effects->stackingOrder();
EffectWindowList::const_iterator it = order.constEnd(), first = order.constBegin();
while( it != first ) {
m_scheduledScreenshot = *(--it);
if (m_scheduledScreenshot->isOnCurrentDesktop() &&
!m_scheduledScreenshot->isMinimized() && !m_scheduledScreenshot->isDeleted() &&
m_scheduledScreenshot->geometry().contains(cursor))
break;
m_scheduledScreenshot = 0;
}
if (m_scheduledScreenshot) {
m_scheduledScreenshot->addRepaintFull();
}
}
void ScreenShotEffect::screenshotForWindow(qulonglong winid, int mask)
{
m_type = (ScreenShotType) mask;
EffectWindow* w = effects->findWindow(winid);
if(w && !w->isMinimized() && !w->isDeleted()) {
m_scheduledScreenshot = w;
m_scheduledScreenshot->addRepaintFull();
}
}
QString ScreenShotEffect::screenshotFullscreen()
{
return blitScreenshot(QRect(0, 0, displayWidth(), displayHeight()));
}
QString ScreenShotEffect::screenshotScreen(int screen)
{
return blitScreenshot(effects->clientArea(FullScreenArea, screen, 0));
}
QString ScreenShotEffect::screenshotArea(int x, int y, int width, int height)
{
return blitScreenshot(QRect(x, y, width, height));
}
QString ScreenShotEffect::blitScreenshot(const QRect &geometry)
{
#ifdef KWIN_HAVE_OPENGLES
Q_UNUSED(geometry)
kDebug(1212) << "Framebuffer Blit not supported";
return QString();
#else
QImage img;
if (effects->isOpenGLCompositing())
{
if (!GLRenderTarget::blitSupported()) {
kDebug(1212) << "Framebuffer Blit not supported";
return QString();
}
GLTexture tex(geometry.width(), geometry.height());
GLRenderTarget target(tex);
target.blitFromFramebuffer(geometry);
// copy content from framebuffer into image
tex.bind();
img = QImage(geometry.size(), QImage::Format_ARGB32);
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)img.bits());
tex.unbind();
ScreenShotEffect::convertFromGLImage(img, geometry.width(), geometry.height());
}
if (effects->compositingType() == XRenderCompositing) {
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
QPixmap buffer(geometry.size());
if (buffer.handle() == 0) {
Pixmap xpix = XCreatePixmap(display(), rootWindow(), geometry.width(), geometry.height(), 32);
buffer = QPixmap::fromX11Pixmap(xpix, QPixmap::ExplicitlyShared);
}
XRenderComposite(display(), PictOpSrc, effects->xrenderBufferPicture(), None, buffer.x11PictureHandle(),
0, 0, 0, 0, geometry.x(), geometry.y(), geometry.width(), geometry.height());
img = buffer.toImage();
#endif
}
KTemporaryFile temp;
temp.setSuffix(".png");
temp.setAutoRemove(false);
if (!temp.open()) {
return QString();
}
img.save(&temp);
temp.close();
return temp.fileName();
#endif
}
void ScreenShotEffect::grabPointerImage(QImage& snapshot, int offsetx, int offsety)
// Uses the X11_EXTENSIONS_XFIXES_H extension to grab the pointer image, and overlays it onto the snapshot.
{
XFixesCursorImage *xcursorimg = XFixesGetCursorImage(QX11Info::display());
if (!xcursorimg)
return;
//Annoyingly, xfixes specifies the data to be 32bit, but places it in an unsigned long *
//which can be 64 bit. So we need to iterate over a 64bit structure to put it in a 32bit
//structure.
QVarLengthArray< quint32 > pixels(xcursorimg->width * xcursorimg->height);
for (int i = 0; i < xcursorimg->width * xcursorimg->height; ++i)
pixels[i] = xcursorimg->pixels[i] & 0xffffffff;
QImage qcursorimg((uchar *) pixels.data(), xcursorimg->width, xcursorimg->height,
QImage::Format_ARGB32_Premultiplied);
QPainter painter(&snapshot);
painter.drawImage(QPointF(xcursorimg->x - xcursorimg->xhot - offsetx, xcursorimg->y - xcursorimg ->yhot - offsety), qcursorimg);
XFree(xcursorimg);
}
void ScreenShotEffect::convertFromGLImage(QImage &img, int w, int h)
{
// from QtOpenGL/qgl.cpp
// Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
// see http://qt.gitorious.org/qt/qt/blobs/master/src/opengl/qgl.cpp
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
// OpenGL gives RGBA; Qt wants ARGB
uint *p = (uint*)img.bits();
uint *end = p + w * h;
while (p < end) {
uint a = *p << 24;
*p = (*p >> 8) | a;
p++;
}
} else {
// OpenGL gives ABGR (i.e. RGBA backwards); Qt wants ARGB
for (int y = 0; y < h; y++) {
uint *q = (uint*)img.scanLine(y);
for (int x = 0; x < w; ++x) {
const uint pixel = *q;
*q = ((pixel << 16) & 0xff0000) | ((pixel >> 16) & 0xff)
| (pixel & 0xff00ff00);
q++;
}
}
}
img = img.mirrored();
}
bool ScreenShotEffect::isActive() const
{
return m_scheduledScreenshot != NULL && !effects->isScreenLocked();
}
void ScreenShotEffect::windowClosed( EffectWindow* w )
{
if (w == m_scheduledScreenshot) {
m_scheduledScreenshot = NULL;
screenshotWindowUnderCursor(m_type);
}
}
} // namespace
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