commit 7889168c

Poul Sander · 2026-02-26 18:27
7889168c675ba4beabd2e3bdf0477727bf6175c8 patch · browse files
parent 4ae57f605f6f277051ad1fd5b4e3c064dbec0576

Make the image viewer able to show large pictures.

Changed files

M	src/imageviewwidget.cpp before
M	src/mainwindow.cpp before
M	src/thumbnailworker.cpp before

diff --git a/src/imageviewwidget.cpp b/src/imageviewwidget.cpp index 7889a96..1f8b39e 100644 --- a/src/imageviewwidget.cpp +++ b/src/imageviewwidget.cpp

@@ -20,6 +20,9 @@ void ImageViewWidget::setImage(const QString &path)

QImageReader reader(path);

reader.setAutoTransform(true);

reader.setDecideFormatFromContent(true);

+ // Disable the allocation limit so very large images can be viewed.

+ // The default 128 MB limit rejects high-resolution photos.

+ reader.setAllocationLimit(0);

QImage image = reader.read();

if (!image.isNull()) {

diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp index fd2b7a6..c6fe438 100644 --- a/src/mainwindow.cpp +++ b/src/mainwindow.cpp

@@ -258,6 +258,12 @@ void MainWindow::showPreview(const QModelIndex &index)

QImageReader reader(path);

reader.setAutoTransform(true);

+ // Scale during decoding for the preview to avoid the 128 MB allocation limit

+ QSize fullSize = reader.size();

+ if (fullSize.isValid()) {

+ QSize target = fullSize.scaled(m_previewLabel->size(), Qt::KeepAspectRatio);

+ reader.setScaledSize(target);

+ }

QImage image = reader.read();

m_previewLabel->setPixmap(

diff --git a/src/thumbnailworker.cpp b/src/thumbnailworker.cpp index 9b094ba..5a209ab 100644 --- a/src/thumbnailworker.cpp +++ b/src/thumbnailworker.cpp

@@ -20,6 +20,14 @@ void ThumbnailWorker::run()

QImageReader reader(m_path);

reader.setAutoTransform(true);

+ // Scale during decoding to avoid hitting the allocation limit

+ // on very large images (Qt 6 defaults to 128 MB).

+ QSize fullSize = reader.size();

+ if (fullSize.isValid()) {

+ QSize target = fullSize.scaled(128, 128, Qt::KeepAspectRatio);

+ reader.setScaledSize(target);

+ }

QImage image = reader.read();

if (*m_cancelFlag)

@@ -28,6 +36,7 @@ void ThumbnailWorker::run()

if (!image.isNull())

{

// Scale to fit within 128x128 keeping aspect ratio

+ // (may already be the right size if setScaledSize succeeded)

QImage scaled = image.scaled(128, 128,

Qt::KeepAspectRatio,

Qt::SmoothTransformation);