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Export JPEG: a zoomable full-size preview, its buttons and the View menu's zoom keys (13.4b)

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ZacharyZhang-NY committed 2026-10-01 08:53:43 -04:00
1 parent bc49b722eb
commit 64ebd1cdf9
17 files changed
+702 -74
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tests/JPEGExportTests.cpp
+13 -10
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@@ -14,7 +14,7 @@ private slots:
void transparencyUsesChosenMatteAndProducesOpaqueSRGB_data();
void transparencyUsesChosenMatteAndProducesOpaqueSRGB();
void qualityChangesBytesAndDecodedPixels();
void thePreviewIsDecodedFromTheFileAndKeptSmall();
void thePreviewIsDecodedFromTheFileUpToItsLimit();
void pixelsLieOverTheMatteOnce();
void whatCannotBeEncodedDecodedOrAllocatedThrows();
void cancellationStopsAtSwiftsThreePoints();
@@ -88,22 +88,25 @@ void JPEGExportTests::qualityChangesBytesAndDecodedPixels()
QCOMPARE(written.readAll(), high.data);
}
void JPEGExportTests::thePreviewIsDecodedFromTheFileAndKeptSmall()
void JPEGExportTests::thePreviewIsDecodedFromTheFileUpToItsLimit()
{
const JPEGResult small = ImageExporter::jpeg({noise(64, 48, 1)}, {.quality = 0.1});
QCOMPARE(small.preview.size(), QSize(64, 48));
// Compression shows in the preview: it is not the source.
QCOMPARE(small.preview.convertToFormat(QImage::Format_RGB888), QImage::fromData(small.data).convertToFormat(QImage::Format_RGB888));
QVERIFY(small.preview.convertToFormat(QImage::Format_RGB888) != noise(64, 48, 1).convertToFormat(QImage::Format_RGB888));
const JPEGResult wide = ImageExporter::jpeg({solid(2400, 600, qRgba(10, 200, 30, 255))}, {});
QCOMPARE(wide.preview.size(), QSize(1000, 250));
QCOMPARE(QImage::fromData(wide.data).size(), QSize(2400, 600));
const JPEGResult tall = ImageExporter::jpeg({solid(500, 2000, qRgba(10, 200, 30, 255))}, {});
QCOMPARE(tall.preview.size(), QSize(250, 1000));
QCOMPARE(ImageExporter::jpeg({solid(1000, 1000, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(1000, 1000));
// Full size for 100%, past Qt's 128 MB decode limit.
QCOMPARE(ImageExporter::jpeg({solid(6000, 6000, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(6000, 6000));
QCOMPARE(ImageExporter::jpeg({solid(2400, 600, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(2400, 600));
QCOMPARE(JPEGResult::previewLimit, 8192);
QCOMPARE(ImageExporter::jpeg({solid(8192, 4, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(8192, 4));
const JPEGResult wide = ImageExporter::jpeg({solid(9000, 900, qRgba(10, 200, 30, 255))}, {});
QCOMPARE(wide.preview.size(), QSize(8192, 819));
QCOMPARE(QImage::fromData(wide.data).size(), QSize(9000, 900));
QCOMPARE(ImageExporter::jpeg({solid(900, 9000, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(819, 8192));
// Thin images keep a pixel across.
QCOMPARE(ImageExporter::jpeg({solid(2400, 1, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(1000, 1));
QCOMPARE(ImageExporter::jpeg({solid(1, 2400, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(1, 1000));
QCOMPARE(ImageExporter::jpeg({solid(9000, 1, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(8192, 1));
QCOMPARE(ImageExporter::jpeg({solid(1, 9000, qRgba(10, 200, 30, 255))}, {}).preview.size(), QSize(1, 8192));
}
void JPEGExportTests::pixelsLieOverTheMatteOnce()