kwin/effects/screenshot/screenshot.cpp
Méven Car 137a6a1705 ScreenShotEffect: Add a shouldReturnNativeSize argument to screenshotFullscreen
Summary:
Add a shouldReturnNativeSize to screenshotFullscreen so that KWin can export
screenshot that are screen pixel accurate.

Useful for spectacle to be able to do rectangular selection kind of screenshot.

Test Plan:
Example of a top screen using a 1.25 scale ratio being export in native resolution
{F8255144}
(The top screen has a bigger size than its virtual geometry and next screen doesn't overlap)

Example of the same screen in virtual resolution:
{F8255146}

Reviewers: #kwin, davidedmundson, bport, zzag, apol

Reviewed By: #kwin, davidedmundson

Subscribers: broulik, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D29122
2020-04-29 19:16:22 +02:00

824 lines
29 KiB
C++

/********************************************************************
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 <QtConcurrentRun>
#include <QDataStream>
#include <QTemporaryFile>
#include <QDir>
#include <QDBusConnection>
#include <QVarLengthArray>
#include <QPainter>
#include <QMatrix4x4>
#include <xcb/xcb_image.h>
#include <QPoint>
#include <KLocalizedString>
#include <KNotification>
#include <unistd.h>
class ComparableQPoint : public QPoint
{
public:
ComparableQPoint(QPoint& point): QPoint(point.x(), point.y())
{}
ComparableQPoint(QPoint point): QPoint(point.x(), point.y())
{}
ComparableQPoint(): QPoint()
{}
// utility class that allows using QMap to sort its keys when they are QPoint
// so that the bottom and right points are after the top left ones
bool operator<(const ComparableQPoint &other) const {
return x() < other.x() || y() < other.y();
}
};
namespace KWin
{
const static QString s_errorAlreadyTaking = QStringLiteral("org.kde.kwin.Screenshot.Error.AlreadyTaking");
const static QString s_errorAlreadyTakingMsg = QStringLiteral("A screenshot is already been taken");
const static QString s_errorFd = QStringLiteral("org.kde.kwin.Screenshot.Error.FileDescriptor");
const static QString s_errorFdMsg = QStringLiteral("No valid file descriptor");
const static QString s_errorCancelled = QStringLiteral("org.kde.kwin.Screenshot.Error.Cancelled");
const static QString s_errorCancelledMsg = QStringLiteral("Screenshot got cancelled");
const static QString s_errorInvalidArea = QStringLiteral("org.kde.kwin.Screenshot.Error.InvalidArea");
const static QString s_errorInvalidAreaMsg = QStringLiteral("Invalid area requested");
const static QString s_errorInvalidScreen = QStringLiteral("org.kde.kwin.Screenshot.Error.InvalidScreen");
const static QString s_errorInvalidScreenMsg = QStringLiteral("Invalid screen requested");
bool ScreenShotEffect::supported()
{
return effects->compositingType() == XRenderCompositing ||
(effects->isOpenGLCompositing() && GLRenderTarget::supported());
}
ScreenShotEffect::ScreenShotEffect()
: m_scheduledScreenshot(nullptr)
{
connect(effects, &EffectsHandler::windowClosed, this, &ScreenShotEffect::windowClosed);
QDBusConnection::sessionBus().registerObject(QStringLiteral("/Screenshot"), this, QDBusConnection::ExportScriptableContents);
}
ScreenShotEffect::~ScreenShotEffect()
{
QDBusConnection::sessionBus().unregisterObject(QStringLiteral("/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.copy();
}
#endif
static QSize pickWindowSize(const QImage &image)
{
xcb_connection_t *c = effects->xcbConnection();
// This will implicitly enable BIG-REQUESTS extension.
const uint32_t maximumRequestSize = xcb_get_maximum_request_length(c);
const xcb_setup_t *setup = xcb_get_setup(c);
uint32_t requestSize = sizeof(xcb_put_image_request_t);
// With BIG-REQUESTS extension an additional 32-bit field is inserted into
// the request so we better take it into account.
if (setup->maximum_request_length < maximumRequestSize) {
requestSize += 4;
}
const uint32_t maximumDataSize = 4 * maximumRequestSize - requestSize;
const uint32_t bytesPerPixel = image.depth() >> 3;
const uint32_t bytesPerLine = image.bytesPerLine();
if (image.sizeInBytes() <= maximumDataSize) {
return image.size();
}
if (maximumDataSize < bytesPerLine) {
return QSize(maximumDataSize / bytesPerPixel, 1);
}
return QSize(image.width(), maximumDataSize / bytesPerLine);
}
static xcb_pixmap_t xpixmapFromImage(const QImage &image)
{
xcb_connection_t *c = effects->xcbConnection();
xcb_pixmap_t pixmap = xcb_generate_id(c);
xcb_gcontext_t gc = xcb_generate_id(c);
xcb_create_pixmap(c, image.depth(), pixmap, effects->x11RootWindow(),
image.width(), image.height());
xcb_create_gc(c, gc, pixmap, 0, nullptr);
const int bytesPerPixel = image.depth() >> 3;
// Figure out how much data we can send with one invocation of xcb_put_image.
// In contrast to XPutImage, xcb_put_image doesn't implicitly split the data.
const QSize window = pickWindowSize(image);
for (int i = 0; i < image.height(); i += window.height()) {
const int targetHeight = qMin(image.height() - i, window.height());
const uint8_t *line = image.scanLine(i);
for (int j = 0; j < image.width(); j += window.width()) {
const int targetWidth = qMin(image.width() - j, window.width());
const uint8_t *bytes = line + j * bytesPerPixel;
const uint32_t byteCount = targetWidth * targetHeight * bytesPerPixel;
xcb_put_image(c, XCB_IMAGE_FORMAT_Z_PIXMAP, pixmap,
gc, targetWidth, targetHeight, j, i, 0, image.depth(),
byteCount, bytes);
}
}
xcb_flush(c);
xcb_free_gc(c, gc);
return pixmap;
}
void ScreenShotEffect::paintScreen(int mask, const QRegion &region, ScreenPaintData &data)
{
m_cachedOutputGeometry = data.outputGeometry();
// When taking a non-nativeSize fullscreenshot, pretend we have a uniform 1.0 ratio
// so the screenshot size will match the virtualGeometry
m_cachedScale = m_nativeSize ? data.screenScale() : 1.0;
effects->paintScreen(mask, region, data);
}
/**
* Translates the Point coordinates in m_cacheOutputsImages keys from the virtualGeometry
* To a new geometry taking into account the real size of the images (virtualSize * dpr),
* moving the siblings images on the right bottom of the image as necessary
*/
void ScreenShotEffect::computeCoordinatesAfterScaling()
{
// prepare a translation table that will store oldPoint -> newPoint in the new coordinates
QMap<ComparableQPoint, ComparableQPoint> translationMap;
for (auto i = m_cacheOutputsImages.keyBegin(); i != m_cacheOutputsImages.keyEnd(); ++i) {
translationMap.insert(*i, *i);
}
for (auto i = m_cacheOutputsImages.constBegin(); i != m_cacheOutputsImages.constEnd(); ++i) {
const auto p = i.key();
const auto img = i.value();
const auto dpr = img.devicePixelRatio();
if (!qFuzzyCompare(dpr, 1.0)) {
// must update all coordinates of next rects
const int deltaX = img.width() - (img.width() / dpr);
const int deltaY = img.height() - (img.height() / dpr);
// for the next images on the right or bottom
// thanks to ComparableQPoint
for (auto i2 = m_cacheOutputsImages.constFind(p);
i2 != m_cacheOutputsImages.constEnd(); ++i2) {
const auto point = i2.key();
auto finalPoint = translationMap.value(point);
if (point.x() >= img.width() + p.x() - deltaX) {
finalPoint.setX(finalPoint.x() + deltaX);
}
if (point.y() >= img.height() + p.y() - deltaY) {
finalPoint.setY(finalPoint.y() + deltaY);
}
// update final position point with the necessary deltas
translationMap.insert(point, finalPoint);
}
}
}
// make the new coordinates effective
for (auto i = translationMap.keyBegin(); i != translationMap.keyEnd(); ++i) {
const auto key = *i;
const auto img = m_cacheOutputsImages.take(key);
m_cacheOutputsImages.insert(translationMap.value(key), img);
}
}
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.sizeInBytes(), (GLvoid*)img.bits());
GLRenderTarget::popRenderTarget();
ScreenShotEffect::convertFromGLImage(img, width, height);
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
xcb_image_t *xImage = nullptr;
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);
}
if (m_windowMode == WindowMode::Xpixmap) {
const xcb_pixmap_t xpix = xpixmapFromImage(img);
emit screenshotCreated(xpix);
m_windowMode = WindowMode::NoCapture;
} else if (m_windowMode == WindowMode::File) {
sendReplyImage(img);
} else if (m_windowMode == WindowMode::FileDescriptor) {
QtConcurrent::run(
[] (int fd, const QImage &img) {
QFile file;
if (file.open(fd, QIODevice::WriteOnly, QFileDevice::AutoCloseHandle)) {
QDataStream ds(&file);
ds << img;
file.close();
} else {
close(fd);
}
}, m_fd, img);
m_windowMode = WindowMode::NoCapture;
m_fd = -1;
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (xImage) {
xcb_image_destroy(xImage);
}
#endif
}
m_scheduledScreenshot = nullptr;
}
if (!m_scheduledGeometry.isNull()) {
if (!m_cachedOutputGeometry.isNull()) {
// special handling for per-output geometry rendering
const QRect intersection = m_scheduledGeometry.intersected(m_cachedOutputGeometry);
if (intersection.isEmpty()) {
// doesn't intersect, not going onto this screenshot
return;
}
QImage img = blitScreenshot(intersection, m_cachedScale);
if (img.size() == (m_scheduledGeometry.size() * m_cachedScale)) {
// we are done
sendReplyImage(img);
return;
}
img.setDevicePixelRatio(m_cachedScale);
m_cacheOutputsImages.insert(ComparableQPoint(m_cachedOutputGeometry.topLeft()), img);
m_multipleOutputsRendered = m_multipleOutputsRendered.united(intersection);
if (m_multipleOutputsRendered.boundingRect() == m_scheduledGeometry) {
// Recompute coordinates
if (m_nativeSize) {
computeCoordinatesAfterScaling();
}
// find the output image size
int width = 0;
int height = 0;
QMap<ComparableQPoint, QImage>::const_iterator i;
for (i = m_cacheOutputsImages.constBegin(); i != m_cacheOutputsImages.constEnd(); ++i) {
const auto pos = i.key();
const auto img = i.value();
width = qMax(width, pos.x() + img.width());
height = qMax(height, pos.y() + img.height());
}
QImage multipleOutputsImage = QImage(width, height, QImage::Format_ARGB32);
QPainter p;
p.begin(&multipleOutputsImage);
// reassemble images together
for (i = m_cacheOutputsImages.begin(); i != m_cacheOutputsImages.end(); ++i) {
auto pos = i.key();
auto img = i.value();
// disable dpr rendering, we already took care of this
img.setDevicePixelRatio(1.0);
p.drawImage(pos, img);
}
p.end();
sendReplyImage(multipleOutputsImage);
}
} else {
const QImage img = blitScreenshot(m_scheduledGeometry);
sendReplyImage(img);
}
}
}
void ScreenShotEffect::sendReplyImage(const QImage &img)
{
if (m_fd != -1) {
QtConcurrent::run(
[] (int fd, const QImage &img) {
QFile file;
if (file.open(fd, QIODevice::WriteOnly, QFileDevice::AutoCloseHandle)) {
QDataStream ds(&file);
ds << img;
file.close();
} else {
close(fd);
}
}, m_fd, img);
m_fd = -1;
} else {
QDBusConnection::sessionBus().send(m_replyMessage.createReply(saveTempImage(img)));
}
m_scheduledGeometry = QRect();
m_multipleOutputsRendered = QRegion();
m_captureCursor = false;
m_windowMode = WindowMode::NoCapture;
m_cacheOutputsImages.clear();
m_cachedOutputGeometry = QRect();
}
QString ScreenShotEffect::saveTempImage(const QImage &img)
{
if (img.isNull()) {
return QString();
}
QTemporaryFile temp(QDir::tempPath() + QDir::separator() + QLatin1String("kwin_screenshot_XXXXXX.png"));
temp.setAutoRemove(false);
if (!temp.open()) {
return QString();
}
img.save(&temp);
temp.close();
KNotification::event(KNotification::Notification,
i18nc("Notification caption that a screenshot got saved to file", "Screenshot"),
i18nc("Notification with path to screenshot file", "Screenshot saved to %1", temp.fileName()),
QStringLiteral("spectacle"));
return temp.fileName();
}
void ScreenShotEffect::screenshotWindowUnderCursor(int mask)
{
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return;
}
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 = nullptr;
}
if (m_scheduledScreenshot) {
m_windowMode = WindowMode::Xpixmap;
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_windowMode = WindowMode::Xpixmap;
m_scheduledScreenshot = w;
m_scheduledScreenshot->addRepaintFull();
}
}
QString ScreenShotEffect::interactive(int mask)
{
if (!calledFromDBus()) {
return QString();
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return QString();
}
m_type = (ScreenShotType) mask;
m_windowMode = WindowMode::File;
m_replyMessage = message();
setDelayedReply(true);
effects->startInteractiveWindowSelection(
[this] (EffectWindow *w) {
hideInfoMessage();
if (!w) {
QDBusConnection::sessionBus().send(m_replyMessage.createErrorReply(s_errorCancelled, s_errorCancelledMsg));
m_windowMode = WindowMode::NoCapture;
return;
} else {
m_scheduledScreenshot = w;
m_scheduledScreenshot->addRepaintFull();
}
});
showInfoMessage(InfoMessageMode::Window);
return QString();
}
void ScreenShotEffect::interactive(QDBusUnixFileDescriptor fd, int mask)
{
if (!calledFromDBus()) {
return;
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return;
}
m_fd = dup(fd.fileDescriptor());
if (m_fd == -1) {
sendErrorReply(s_errorFd, s_errorFdMsg);
return;
}
m_type = (ScreenShotType) mask;
m_windowMode = WindowMode::FileDescriptor;
effects->startInteractiveWindowSelection(
[this] (EffectWindow *w) {
hideInfoMessage();
if (!w) {
close(m_fd);
m_fd = -1;
m_windowMode = WindowMode::NoCapture;
return;
} else {
m_scheduledScreenshot = w;
m_scheduledScreenshot->addRepaintFull();
}
});
showInfoMessage(InfoMessageMode::Window);
}
void ScreenShotEffect::showInfoMessage(InfoMessageMode mode)
{
QString text;
switch (mode) {
case InfoMessageMode::Window:
text = i18n("Select window to screen shot with left click or enter.\nEscape or right click to cancel.");
break;
case InfoMessageMode::Screen:
text = i18n("Create screen shot with left click or enter.\nEscape or right click to cancel.");
break;
}
effects->showOnScreenMessage(text, QStringLiteral("spectacle"));
}
void ScreenShotEffect::hideInfoMessage()
{
effects->hideOnScreenMessage(EffectsHandler::OnScreenMessageHideFlag::SkipsCloseAnimation);
}
QString ScreenShotEffect::screenshotFullscreen(bool captureCursor)
{
if (!calledFromDBus()) {
return QString();
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return QString();
}
m_replyMessage = message();
setDelayedReply(true);
m_scheduledGeometry = effects->virtualScreenGeometry();
m_captureCursor = captureCursor;
effects->addRepaintFull();
return QString();
}
void ScreenShotEffect::screenshotFullscreen(QDBusUnixFileDescriptor fd, bool captureCursor, bool shouldReturnNativeSize)
{
if (!calledFromDBus()) {
return;
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return;
}
m_fd = dup(fd.fileDescriptor());
if (m_fd == -1) {
sendErrorReply(s_errorFd, s_errorFdMsg);
return;
}
m_captureCursor = captureCursor;
m_nativeSize = shouldReturnNativeSize;
showInfoMessage(InfoMessageMode::Screen);
effects->startInteractivePositionSelection(
[this] (const QPoint &p) {
hideInfoMessage();
if (p == QPoint(-1, -1)) {
// error condition
close(m_fd);
m_fd = -1;
} else {
m_scheduledGeometry = effects->virtualScreenGeometry();
effects->addRepaint(m_scheduledGeometry);
}
}
);
}
QString ScreenShotEffect::screenshotScreen(int screen, bool captureCursor)
{
if (!calledFromDBus()) {
return QString();
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return QString();
}
m_scheduledGeometry = effects->clientArea(FullScreenArea, screen, 0);
if (m_scheduledGeometry.isNull()) {
sendErrorReply(s_errorInvalidScreen, s_errorInvalidScreenMsg);
return QString();
}
m_captureCursor = captureCursor;
m_replyMessage = message();
setDelayedReply(true);
effects->addRepaint(m_scheduledGeometry);
return QString();
}
void ScreenShotEffect::screenshotScreen(QDBusUnixFileDescriptor fd, bool captureCursor)
{
if (!calledFromDBus()) {
return;
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return;
}
m_fd = dup(fd.fileDescriptor());
if (m_fd == -1) {
sendErrorReply(s_errorFd, s_errorFdMsg);
return;
}
m_captureCursor = captureCursor;
showInfoMessage(InfoMessageMode::Screen);
effects->startInteractivePositionSelection(
[this] (const QPoint &p) {
hideInfoMessage();
if (p == QPoint(-1, -1)) {
// error condition
close(m_fd);
m_fd = -1;
} else {
m_scheduledGeometry = effects->clientArea(FullScreenArea, effects->screenNumber(p), 0);
if (m_scheduledGeometry.isNull()) {
close(m_fd);
m_fd = -1;
return;
}
effects->addRepaint(m_scheduledGeometry);
}
}
);
}
QString ScreenShotEffect::screenshotArea(int x, int y, int width, int height, bool captureCursor)
{
if (!calledFromDBus()) {
return QString();
}
if (isTakingScreenshot()) {
sendErrorReply(s_errorAlreadyTaking, s_errorAlreadyTakingMsg);
return QString();
}
m_scheduledGeometry = QRect(x, y, width, height);
if (m_scheduledGeometry.isNull() || m_scheduledGeometry.isEmpty()) {
m_scheduledGeometry = QRect();
sendErrorReply(s_errorInvalidArea, s_errorInvalidAreaMsg);
return QString();
}
m_captureCursor = captureCursor;
m_replyMessage = message();
setDelayedReply(true);
effects->addRepaint(m_scheduledGeometry);
return QString();
}
QImage ScreenShotEffect::blitScreenshot(const QRect &geometry, const qreal scale)
{
QImage img;
if (effects->isOpenGLCompositing())
{
int width = geometry.width();
int height = geometry.height();
if (GLRenderTarget::blitSupported() && !GLPlatform::instance()->isGLES()) {
width = static_cast<int>(width * scale);
height = static_cast<int>(height * scale);
img = QImage(width, height, QImage::Format_ARGB32);
GLTexture tex(GL_RGBA8, width, height);
GLRenderTarget target(tex);
target.blitFromFramebuffer(geometry);
// copy content from framebuffer into image
tex.bind();
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, static_cast<GLvoid*>(img.bits()));
tex.unbind();
} else {
img = QImage(width, height, QImage::Format_ARGB32);
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)img.bits());
}
ScreenShotEffect::convertFromGLImage(img, width, height);
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
if (effects->compositingType() == XRenderCompositing) {
xcb_image_t *xImage = nullptr;
img = xPictureToImage(effects->xrenderBufferPicture(), geometry, &xImage);
if (xImage) {
xcb_image_destroy(xImage);
}
}
#endif
if (m_captureCursor) {
grabPointerImage(img, geometry.x() * scale, geometry.y() * scale);
}
return img;
}
void ScreenShotEffect::grabPointerImage(QImage& snapshot, int offsetx, int offsety)
{
const auto cursor = effects->cursorImage();
if (cursor.image().isNull())
return;
QPainter painter(&snapshot);
painter.drawImage(effects->cursorPos() - cursor.hotSpot() - QPoint(offsetx, offsety), cursor.image());
}
void ScreenShotEffect::convertFromGLImage(QImage &img, int w, int h)
{
// from QtOpenGL/qgl.cpp
// Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
// see https://github.com/qt/qtbase/blob/dev/src/opengl/qgl.cpp
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
// OpenGL gives RGBA; Qt wants ARGB
uint *p = reinterpret_cast<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 = reinterpret_cast<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 != nullptr || !m_scheduledGeometry.isNull()) && !effects->isScreenLocked();
}
void ScreenShotEffect::windowClosed( EffectWindow* w )
{
if (w == m_scheduledScreenshot) {
m_scheduledScreenshot = nullptr;
screenshotWindowUnderCursor(m_type);
}
}
bool ScreenShotEffect::isTakingScreenshot() const
{
if (!m_scheduledGeometry.isNull()) {
return true;
}
if (m_windowMode != WindowMode::NoCapture) {
return true;
}
if (m_fd != -1) {
return true;
}
return false;
}
} // namespace