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Android: Add grabWindow handling

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Draws to a pixmap contents of the requested window. On Android it works
only for QtWidgets application.

Qml application contents could not be grabbed due to lack of access to
the contents of OpenGL framebuffer from QAndroidPlatformScreen

Fixes: QTBUG-63275
Pick-to: 5.15
Change-Id: Ief7de1b709387d798138387bb735f4b48cf2928d
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>
This commit is contained in:
Piotr Mikolajczyk 2021-02-02 06:45:21 +01:00 committed by Ville Voutilainen
parent 4f37cf2ce5
commit bacf9cd04c
2 changed files with 75 additions and 5 deletions
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72
src/plugins/platforms/android/qandroidplatformscreen.cpp
View File

@ -302,7 +302,7 @@ int QAndroidPlatformScreen::rasterSurfaces()
return m_rasterSurfaces;
}
void QAndroidPlatformScreen::doRedraw()
void QAndroidPlatformScreen::doRedraw(QImage* screenGrabImage)
{
PROFILE_SCOPE;
if (!QtAndroid::activity())
@ -357,15 +357,14 @@ void QAndroidPlatformScreen::doRedraw()
}
int bpp = 4;
QImage::Format format = QImage::Format_RGBA8888_Premultiplied;
if (nativeWindowBuffer.format == WINDOW_FORMAT_RGB_565) {
bpp = 2;
format = QImage::Format_RGB16;
m_pixelFormat = QImage::Format_RGB16;
}
QImage screenImage(reinterpret_cast<uchar *>(nativeWindowBuffer.bits)
, nativeWindowBuffer.width, nativeWindowBuffer.height
, nativeWindowBuffer.stride * bpp , format);
, nativeWindowBuffer.stride * bpp , m_pixelFormat);
QPainter compositePainter(&screenImage);
compositePainter.setCompositionMode(QPainter::CompositionMode_Source);
@ -398,6 +397,31 @@ void QAndroidPlatformScreen::doRedraw()
ret = ANativeWindow_unlockAndPost(m_nativeSurface);
if (ret >= 0)
m_dirtyRect = QRect();
if (screenGrabImage) {
if (screenGrabImage->size() != screenImage.size()) {
uchar* bytes = static_cast<uchar*>(malloc(screenImage.height() * screenImage.bytesPerLine()));
*screenGrabImage = QImage(bytes, screenImage.width(), screenImage.height(),
screenImage.bytesPerLine(), m_pixelFormat,
[](void* ptr){ if (ptr) free (ptr);});
}
memcpy(screenGrabImage->bits(),
screenImage.bits(),
screenImage.bytesPerLine() * screenImage.height());
}
m_repaintOccurred = true;
}
QPixmap QAndroidPlatformScreen::doScreenShot(QRect grabRect)
{
if (!m_repaintOccurred)
return QPixmap::fromImage(m_lastScreenshot.copy(grabRect));
QRect tmp = m_dirtyRect;
m_dirtyRect = geometry();
doRedraw(&m_lastScreenshot);
m_dirtyRect = tmp;
m_repaintOccurred = false;
return QPixmap::fromImage(m_lastScreenshot.copy(grabRect));
}
static const int androidLogicalDpi = 72;
@ -445,4 +469,44 @@ void QAndroidPlatformScreen::releaseSurface()
}
}
/*!
This function is called when Qt needs to be able to grab the content of a window.
Returns the content of the window specified with the WId handle within the boundaries of
QRect(x, y, width, height).
*/
QPixmap QAndroidPlatformScreen::grabWindow(WId window, int x, int y, int width, int height) const
{
QRectF screenshotRect(x, y, width, height);
QWindow* wnd = 0;
if (window)
{
const auto windowList = qApp->allWindows();
for (QWindow *w : windowList)
if (w->winId() == window) {
wnd = w;
break;
}
}
if (wnd) {
const qreal factor = logicalDpi().first / androidLogicalDpi; //HighDPI factor;
QRectF wndRect = wnd->geometry();
if (wnd->parent())
wndRect.moveTopLeft(wnd->parent()->mapToGlobal(wndRect.topLeft().toPoint()));
if (!qFuzzyCompare(factor, 1))
wndRect = QRectF(wndRect.left() * factor, wndRect.top() * factor,
wndRect.width() * factor, wndRect.height() * factor);
if (!screenshotRect.isEmpty()) {
screenshotRect.moveTopLeft(wndRect.topLeft() + screenshotRect.topLeft());
screenshotRect = screenshotRect.intersected(wndRect);
} else {
screenshotRect = wndRect;
}
} else {
screenshotRect = screenshotRect.isValid() ? screenshotRect : geometry();
}
return const_cast<QAndroidPlatformScreen *>(this)->doScreenShot(screenshotRect.toRect());
}
QT_END_NAMESPACE

8
src/plugins/platforms/android/qandroidplatformscreen.h
View File

@ -106,12 +106,14 @@ private:
QDpi logicalBaseDpi() const override;
Qt::ScreenOrientation orientation() const override;
Qt::ScreenOrientation nativeOrientation() const override;
QPixmap grabWindow(WId window, int x, int y, int width, int height) const override;
void surfaceChanged(JNIEnv *env, jobject surface, int w, int h) override;
void releaseSurface();
void applicationStateChanged(Qt::ApplicationState);
QPixmap doScreenShot(QRect grabRect = QRect());
private slots:
void doRedraw();
void doRedraw(QImage *screenGrabImage = nullptr);
private:
int m_id = -1;
@ -119,6 +121,10 @@ private:
ANativeWindow* m_nativeSurface = nullptr;
QWaitCondition m_surfaceWaitCondition;
QSize m_size;
QImage m_lastScreenshot;
QImage::Format m_pixelFormat = QImage::Format_RGBA8888_Premultiplied;
bool m_repaintOccurred = false;
};
QT_END_NAMESPACE