Fix copying images to clipboard

The SkBitmap to QImage conversion in ClipboardQt::WriteBitmap was
hardcoding the image format to ARGB32. This failed whenever the format
of the SkBitmap provided by Chromium was different.

This change backports 1cf9175e from 5.7.

Task-number: QTBUG-52715
Change-Id: Icf27b97bc421a2201c307a4514928dcf384d9ba6
Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/src/core/type_conversion.cpp b/src/core/type_conversion.cpp
new file mode 100644
index 000000000..705d22aed
--- /dev/null
+++ b/src/core/type_conversion.cpp
@@ -0,0 +1,116 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWebEngine module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "type_conversion.h"
+
+namespace QtWebEngineCore {
+
+QImage toQImage(const SkBitmap &bitmap)
+{
+    QImage image;
+    switch (bitmap.colorType()) {
+    case kUnknown_SkColorType:
+        break;
+    case kAlpha_8_SkColorType:
+        image = toQImage(bitmap, QImage::Format_Alpha8);
+        break;
+    case kRGB_565_SkColorType:
+        image = toQImage(bitmap, QImage::Format_RGB16);
+        break;
+    case kARGB_4444_SkColorType:
+        switch (bitmap.alphaType()) {
+        case kUnknown_SkAlphaType:
+            break;
+        case kUnpremul_SkAlphaType:
+            // not supported - treat as opaque
+        case kOpaque_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_RGB444);
+            break;
+        case kPremul_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_ARGB4444_Premultiplied);
+            break;
+        }
+        break;
+    case kRGBA_8888_SkColorType:
+        switch (bitmap.alphaType()) {
+        case kUnknown_SkAlphaType:
+            break;
+        case kOpaque_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_RGBX8888);
+            break;
+        case kPremul_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_RGBA8888_Premultiplied);
+            break;
+        case kUnpremul_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_RGBA8888);
+            break;
+        }
+        break;
+    case kBGRA_8888_SkColorType:
+        // we are assuming little-endian arch here.
+        switch (bitmap.alphaType()) {
+        case kUnknown_SkAlphaType:
+            break;
+        case kOpaque_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_RGB32);
+            break;
+        case kPremul_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_ARGB32_Premultiplied);
+            break;
+        case kUnpremul_SkAlphaType:
+            image = toQImage(bitmap, QImage::Format_ARGB32);
+            break;
+        }
+        break;
+    case kIndex_8_SkColorType: {
+        image = toQImage(bitmap, QImage::Format_Indexed8);
+        SkColorTable *skTable = bitmap.getColorTable();
+        if (skTable) {
+            QVector<QRgb> qTable(skTable->count());
+            for (int i = 0; i < skTable->count(); ++i)
+                qTable[i] = (*skTable)[i];
+            image.setColorTable(qTable);
+        }
+        break;
+    }
+    case kGray_8_SkColorType:
+        image = toQImage(bitmap, QImage::Format_Grayscale8);
+        break;
+    }
+    return image;
+}
+
+} // namespace QtWebEngineCore