1 files changed, 152 insertions, 0 deletions
diff --git a/src/libs/threadimageio/loadingdescription.cpp b/src/libs/threadimageio/loadingdescription.cpp
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+++ b/src/libs/threadimageio/loadingdescription.cpp
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2007-02-03
+ * Description : Loading parameters for multithreaded loading
+ *
+ * Copyright (C) 2006-2007 by Marcel Wiesweg <marcel.wiesweg@gmx.de>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software Foundation;
+ * either version 2, or (at your option)
+ * any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * ============================================================ */
+
+// Local includes.
+
+#include "loadingdescription.h"
+
+namespace Digikam
+{
+
+bool LoadingDescription::PreviewParameters::operator==(const PreviewParameters &other) const
+{
+    return isPreview  == other.isPreview
+            && size       == other.size
+            && exifRotate == other.exifRotate;
+}
+
+LoadingDescription::LoadingDescription(const TQString &filePath)
+    : filePath(filePath)
+{
+    rawDecodingSettings = DRawDecoding();
+}
+
+LoadingDescription::LoadingDescription(const TQString &filePath, DRawDecoding settings)
+    : filePath(filePath), rawDecodingSettings(settings)
+{
+}
+
+LoadingDescription::LoadingDescription(const TQString &filePath, int size, bool exifRotate)
+    : filePath(filePath)
+{
+    rawDecodingSettings = DRawDecoding();
+    previewParameters.isPreview  = false;
+    previewParameters.size       = size;
+    previewParameters.exifRotate = exifRotate;
+}
+
+TQString LoadingDescription::cacheKey() const
+{
+    // Here we have the knowledge which LoadingDescriptions / RawFileDecodingSettings
+    // must be cached separately.
+    // Current assumption:
+    // Eight-bit images are needed for LightTable, and if 16-bit is enabled,
+    // 16-bit half size images for the histogram sidebar,
+    // and 16-bit full size images for the image editor.
+    // Use previewParameters.size, not isPreview - if it is 0, full loading is used.
+
+    TQString suffix = rawDecodingSettings.sixteenBitsImage ? "-16" : "-8";
+
+    if (rawDecodingSettings.halfSizeColorImage)
+        return filePath + suffix + "-halfSizeColorImage";
+    else if (previewParameters.size)
+        return filePath + suffix + "-previewImage";
+    else
+        return filePath + suffix;
+}
+
+TQStringList LoadingDescription::lookupCacheKeys() const
+{
+    // Build a hierarchy which cache entries may be used for this LoadingDescription.
+    // Typically, the first is the best, but an actual loading operation may use a
+    // lower-quality loading and will effectively only add the last entry of the
+    // list to the cache, although it can accept the first if already available.
+    // Sixteen-bit images cannot be used used instead of eight-bit ones because
+    // color management is needed to display them.
+
+    TQString suffix = rawDecodingSettings.sixteenBitsImage ? "-16" : "-8";
+
+    TQStringList keys;
+    keys.append(filePath + suffix);
+    if (rawDecodingSettings.halfSizeColorImage)
+        keys.append(filePath + suffix + "-halfSizeColorImage");
+    if (previewParameters.size)
+        keys.append(filePath + suffix + "-previewImage");
+    return keys;
+}
+
+bool LoadingDescription::isReducedVersion() const
+{
+    // return true if this loads anything but the full version
+    return rawDecodingSettings.halfSizeColorImage
+        || previewParameters.isPreview;
+}
+
+bool LoadingDescription::operator==(const LoadingDescription &other) const
+{
+    return filePath == other.filePath &&
+            rawDecodingSettings == other.rawDecodingSettings &&
+            previewParameters == other.previewParameters;
+}
+
+bool LoadingDescription::equalsIgnoreReducedVersion(const LoadingDescription &other) const
+{
+    return filePath == other.filePath;
+}
+
+bool LoadingDescription::equalsOrBetterThan(const LoadingDescription &other) const
+{
+    // This method is similar to operator==. But it returns true as well if other
+    // Loads a "better" version than this.
+    // Preview parameters must have the same size, or other has no size restriction.
+    // All raw decoding settings must be equal, only the half size parameter is allowed to vary.
+
+    DRawDecoding fullSize = other.rawDecodingSettings;
+    fullSize.halfSizeColorImage = false;
+
+    return filePath == other.filePath &&
+            (
+             rawDecodingSettings == other.rawDecodingSettings ||
+             rawDecodingSettings == fullSize
+            ) &&
+            (
+             (previewParameters.size == other.previewParameters.size) ||
+              other.previewParameters.size
+            );
+}
+
+TQStringList LoadingDescription::possibleCacheKeys(const TQString &filePath)
+{
+    TQStringList keys;
+    keys.append(filePath + "-16");
+    keys.append(filePath + "-16-halfSizeColorImage");
+    keys.append(filePath + "-16-previewImage");
+    keys.append(filePath + "-8");
+    keys.append(filePath + "-8-halfSizeColorImage");
+    keys.append(filePath + "-8-previewImage");
+    return keys;
+}
+
+
+} // namespace Digikam
+