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XCB: set devicePixelRatio on backing store QImages

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The cocoa platform plugin, for example, already does this (via
QCALayerBackingStore::GraphicsBuffer::asImage, which is called by
QCALayerBackingStore::toImage).

This also fixes reporting of image details when tests fail.
For example, tst_QQuickShape::render before this patch:

    FAIL!  : tst_QQuickShape::render() 'QQuickVisualTestUtils::compareImages(actualImg, refImg, &errorMessage)' returned FALSE. (Images are of different size: QSize(400, 300) QSize(200, 150) DPR: 1 1 )

and after:

    FAIL!  : tst_QQuickShape::render() 'QQuickVisualTestUtils::compareImages(actualImg, refImg, &errorMessage)' returned FALSE. (Images are of different size: QSize(400, 300) QSize(200, 150) DPR: 2 1 )

[ChangeLog][Important Behavior Changes][XCB] The images grabbed from a
window (via e.g. QQuickWindow::grabWindow) on XCB will now respect the
window's devicePixelRatio.

Change-Id: I72937d3284e7113efa7ab2f3b5b0fd13bc6dffca
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Mitch Curtis 2024-07-11 10:17:27 +08:00
parent cd213bb750
commit c70fd79a17
1 changed files with 4 additions and 1 deletions
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5
src/plugins/platforms/xcb/qxcbbackingstore.cpp
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@ -226,6 +226,7 @@ void QXcbBackingStoreImage::resize(const QSize &size)
m_xcb_image->data = m_shm_info.shmaddr ? m_shm_info.shmaddr : (uint8_t *)malloc(segmentSize);
m_qimage = QImage(static_cast<uchar *>(m_xcb_image->data), m_xcb_image->width,
m_xcb_image->height, m_xcb_image->stride, m_qimage_format);
m_qimage.setDevicePixelRatio(m_backingStore->window()->devicePixelRatio());
m_graphics_buffer = new QXcbGraphicsBuffer(&m_qimage);
m_xcb_pixmap = xcb_generate_id(xcb_connection());
@ -820,7 +821,9 @@ QImage QXcbBackingStore::toImage() const
// Return an image that does not share QImageData with the original image,
// even if they both point to the same data of the m_xcb_image, otherwise
// painting to m_qimage would detach it from the m_xcb_image data.
return QImage(image.constBits(), image.width(), image.height(), image.format());
QImage imageWrapper = QImage(image.constBits(), image.width(), image.height(), image.format());
imageWrapper.setDevicePixelRatio(image.devicePixelRatio());
return imageWrapper;
}
QPlatformGraphicsBuffer *QXcbBackingStore::graphicsBuffer() const