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effects/screenshot: Add support for HiDPI window screenshots

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In general, on Wayland, there is no such a thing as "window scale factor"
because sub-surfaces can have different buffer scales. However, we know
the scale factor of the output where the window is considered to be on. So
we can use the screen's scale factor as the window's scale factor. In
most cases, it will produce the correct result.
This commit is contained in:
Vlad Zahorodnii 2021-05-28 17:33:26 +03:00
parent a8d702ba30
commit 2b88fab8c1
1 changed files with 8 additions and 1 deletions
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9
src/effects/screenshot/screenshot.cpp
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@ -239,14 +239,20 @@ void ScreenShotEffect::takeScreenShot(ScreenShotWindowData *screenshot)
WindowPaintData d(window);
QRect geometry = window->expandedGeometry();
qreal devicePixelRatio = 1;
if (window->hasDecoration() && !(screenshot->flags & ScreenShotIncludeDecoration)) {
geometry = window->clientGeometry();
}
if (screenshot->flags & ScreenShotNativeResolution) {
if (const EffectScreen *screen = effects->findScreen(window->screen())) {
devicePixelRatio = screen->devicePixelRatio();
}
}
bool validTarget = true;
QScopedPointer<GLTexture> offscreenTexture;
QScopedPointer<GLRenderTarget> target;
if (effects->isOpenGLCompositing()) {
offscreenTexture.reset(new GLTexture(GL_RGBA8, geometry.size()));
offscreenTexture.reset(new GLTexture(GL_RGBA8, geometry.size() * devicePixelRatio));
offscreenTexture->setFilter(GL_LINEAR);
offscreenTexture->setWrapMode(GL_CLAMP_TO_EDGE);
target.reset(new GLRenderTarget(*offscreenTexture));
@ -273,6 +279,7 @@ void ScreenShotEffect::takeScreenShot(ScreenShotWindowData *screenshot)
// copy content from framebuffer into image
img = QImage(offscreenTexture->size(), QImage::Format_ARGB32);
img.setDevicePixelRatio(devicePixelRatio);
glReadnPixels(0, 0, img.width(), img.height(), GL_RGBA, GL_UNSIGNED_BYTE, img.sizeInBytes(),
static_cast<GLvoid *>(img.bits()));
GLRenderTarget::popRenderTarget();