14.28 round 1: the cache, the job's brightness and the scope's bytes pinned

tests/CameraRawFoldFailureTests.cpp

@@ -0,0 +1,58 @@
+#include "AddressSpaceLimit.h"
+#include "Document/BrushStroke.h"
+#include "Document/EditorSession.h"
+#include "Document/Filters.h"
+#include <QtTest>
+#include <malloc.h>
+
+// What a8630e4 spares: a second measure, a second picture.
+class CameraRawFoldFailureTests : public QObject {
+    Q_OBJECT
+private slots:
+    void aMeasuredSourceIsNotDrawnAgain();
+    void theScopeReadsPremultipliedBytesInPlace();
+};
+
+void CameraRawFoldFailureTests::aMeasuredSourceIsNotDrawnAgain()
+{
+    QImage gray = BrushRaster::context(2048, 2048, false);
+    gray.fill(QColor(64, 64, 64));
+    EditorSession session;
+    session.createDocument(2048, 2048);
+    session.insert(ImportedImage(gray, gray.scaled(96, 96), QStringLiteral("Gray")));
+    session.beginFilter(FilterKind::cameraRaw);
+    const FilterEdit &edit = session.filterEdit().value();
+    QCOMPARE(edit.previewSource.size(), QSize(2048, 2048));
+    QVERIFY(std::abs(edit.previewBrightness().brightest - 64) < 0.01);
+    double again = 0;
+    {
+        // No room for a 16 MB redraw: the reading stays.
+        const AddressSpaceLimit limit(2ll << 20);
+        again = edit.previewBrightness().brightest;
+    }
+    QVERIFY(std::abs(again - 64) < 0.01);
+}
+
+void CameraRawFoldFailureTests::theScopeReadsPremultipliedBytesInPlace()
+{
+    QImage gray = BrushRaster::context(4096, 4096, false);
+    gray.fill(QColor(64, 64, 64));
+    std::optional<CameraRawScope> scope;
+    {
+        // A 64 MB copy cannot fit; bytes read in place.
+        const AddressSpaceLimit limit(2ll << 20);
+        scope = CameraRawScope::make(gray);
+    }
+    QCOMPARE(scope.value().red[64], 2048.0 * 2048.0);
+}
+
+int main(int argc, char **argv)
+{
+    // Large asks map memory the limit counts.
+    mallopt(M_MMAP_THRESHOLD, 64 * 1024);
+    QApplication app(argc, argv);
+    CameraRawFoldFailureTests tests;
+    return QTest::qExec(&tests, argc, argv);
+}
+
+#include "CameraRawFoldFailureTests.moc"