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kwin/effects/screenshot/screenshot.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2010 Martin Gräßlin <mgraesslin@kde.org>
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 <kwinglplatform.h>
#include <kwinglutils.h>
#include <kwinxrenderutils.h>
#include <QtCore/QTemporaryFile>
#include <QtCore/QDir>
#include <QtDBus/QDBusConnection>
#include <QVarLengthArray>
#include <QtGui/QPainter>
#include <QMatrix4x4>
#include <xcb/xcb_image.h>
namespace KWin
{
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(QStringLiteral("/Screenshot"), this, QDBusConnection::ExportScriptableContents);
QDBusConnection::sessionBus().registerService(QStringLiteral("org.kde.kwin.Screenshot"));
}
ScreenShotEffect::~ScreenShotEffect()
{
QDBusConnection::sessionBus().unregisterObject(QStringLiteral("/Screenshot"));
QDBusConnection::sessionBus().unregisterService(QStringLiteral("org.kde.kwin.Screenshot"));
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
static QImage xPictureToImage(xcb_render_picture_t srcPic, const QRect &geometry, xcb_image_t **xImage)
{
xcb_connection_t *c = effects->xcbConnection();
xcb_pixmap_t xpix = xcb_generate_id(c);
xcb_create_pixmap(c, 32, xpix, effects->x11RootWindow(), geometry.width(), geometry.height());
XRenderPicture pic(xpix, 32);
xcb_render_composite(c, XCB_RENDER_PICT_OP_SRC, srcPic, XCB_RENDER_PICTURE_NONE, pic,
geometry.x(), geometry.y(), 0, 0, 0, 0, geometry.width(), geometry.height());
xcb_flush(c);
*xImage = xcb_image_get(c, xpix, 0, 0, geometry.width(), geometry.height(), ~0, XCB_IMAGE_FORMAT_Z_PIXMAP);
QImage img((*xImage)->data, (*xImage)->width, (*xImage)->height, (*xImage)->stride, QImage::Format_ARGB32_Premultiplied);
// TODO: byte order might need swapping
xcb_free_pixmap(c, xpix);
return img;
}
#endif
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()) {
offscreenTexture.reset(new GLTexture(GL_RGBA8, width, height));
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);
QMatrix4x4 projection;
projection.ortho(QRect(0, 0, offscreenTexture->width(), offscreenTexture->height()));
d.setProjectionMatrix(projection);
effects->drawWindow(m_scheduledScreenshot, mask, infiniteRegion(), d);
// copy content from framebuffer into image
img = QImage(QSize(width, height), QImage::Format_ARGB32);
glReadnPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, img.byteCount(), (GLvoid*)img.bits());
GLRenderTarget::popRenderTarget();
ScreenShotEffect::convertFromGLImage(img, width, height);
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
xcb_image_t *xImage = NULL;
if (effects->compositingType() == XRenderCompositing) {
setXRenderOffscreen(true);
effects->drawWindow(m_scheduledScreenshot, mask, QRegion(0, 0, width, height), d);
if (xRenderOffscreenTarget()) {
img = xPictureToImage(xRenderOffscreenTarget(), QRect(0, 0, width, height), &xImage);
}
setXRenderOffscreen(false);
}
#endif
if (m_type & INCLUDE_CURSOR) {
grabPointerImage(img, m_scheduledScreenshot->x() + left, m_scheduledScreenshot->y() + top);
}
const int depth = img.depth();
xcb_pixmap_t xpix = xcb_generate_id(xcbConnection());
xcb_create_pixmap(xcbConnection(), depth, xpix, x11RootWindow(), img.width(), img.height());
xcb_gcontext_t cid = xcb_generate_id(xcbConnection());
xcb_create_gc(xcbConnection(), cid, xpix, 0, NULL);
xcb_put_image(xcbConnection(), XCB_IMAGE_FORMAT_Z_PIXMAP, xpix, cid, img.width(), img.height(),
0, 0, 0, depth, img.byteCount(), img.constBits());
xcb_free_gc(xcbConnection(), cid);
xcb_flush(xcbConnection());
emit screenshotCreated(xpix);
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (xImage) {
xcb_image_destroy(xImage);
}
#endif
}
m_scheduledScreenshot = NULL;
}
}
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(effects->virtualScreenGeometry());
}
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)
{
QImage img;
if (effects->isOpenGLCompositing())
{
if (!GLRenderTarget::blitSupported()) {
qCDebug(KWINEFFECTS) << "Framebuffer Blit not supported";
return QString();
}
GLTexture tex(GL_RGBA8, 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);
if (GLPlatform::instance()->isGLES()) {
glReadPixels(0, 0, img.width(), img.height(), GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)img.bits());
} else {
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)img.bits());
}
tex.unbind();
ScreenShotEffect::convertFromGLImage(img, geometry.width(), geometry.height());
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
xcb_image_t *xImage = NULL;
#endif
if (effects->compositingType() == XRenderCompositing) {
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
img = xPictureToImage(effects->xrenderBufferPicture(), geometry, &xImage);
#endif
}
QTemporaryFile temp(QDir::tempPath() + QDir::separator() + QLatin1String("kwin_screenshot_XXXXXX.png"));
temp.setAutoRemove(false);
if (!temp.open()) {
return QString();
}
img.save(&temp);
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (xImage) {
xcb_image_destroy(xImage);
}
#endif
temp.close();
return temp.fileName();
}
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.
{
QScopedPointer<xcb_xfixes_get_cursor_image_reply_t, QScopedPointerPodDeleter> cursor(
xcb_xfixes_get_cursor_image_reply(xcbConnection(),
xcb_xfixes_get_cursor_image_unchecked(xcbConnection()),
NULL));
if (cursor.isNull())
return;
QImage qcursorimg((uchar *) xcb_xfixes_get_cursor_image_cursor_image(cursor.data()), cursor->width, cursor->height,
QImage::Format_ARGB32_Premultiplied);
QPainter painter(&snapshot);
painter.drawImage(QPointF(cursor->x - cursor->xhot - offsetx, cursor->y - cursor ->yhot - offsety), qcursorimg);
}
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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