summaryrefslogtreecommitdiffstats
path: root/vcl/source/bitmap/BitmapSymmetryCheck.cxx
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--vcl/source/bitmap/BitmapSymmetryCheck.cxx83
1 files changed, 83 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapSymmetryCheck.cxx b/vcl/source/bitmap/BitmapSymmetryCheck.cxx
new file mode 100644
index 000000000..1bd16e815
--- /dev/null
+++ b/vcl/source/bitmap/BitmapSymmetryCheck.cxx
@@ -0,0 +1,83 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ */
+
+#include <vcl/BitmapReadAccess.hxx>
+
+#include <BitmapSymmetryCheck.hxx>
+
+BitmapSymmetryCheck::BitmapSymmetryCheck()
+{}
+
+bool BitmapSymmetryCheck::check(Bitmap& rBitmap)
+{
+ Bitmap::ScopedReadAccess aReadAccess(rBitmap);
+ return checkImpl(aReadAccess.get());
+}
+
+bool BitmapSymmetryCheck::checkImpl(BitmapReadAccess const * pReadAccess)
+{
+ tools::Long nHeight = pReadAccess->Height();
+ tools::Long nWidth = pReadAccess->Width();
+
+ tools::Long nHeightHalf = nHeight / 2;
+ tools::Long nWidthHalf = nWidth / 2;
+
+ bool bHeightEven = (nHeight % 2) == 0;
+ bool bWidthEven = (nWidth % 2) == 0;
+
+ for (tools::Long y = 0; y < nHeightHalf; ++y)
+ {
+ Scanline pScanlineRead = pReadAccess->GetScanline( y );
+ Scanline pScanlineRead2 = pReadAccess->GetScanline( nHeight - y - 1 );
+ for (tools::Long x = 0; x < nWidthHalf; ++x)
+ {
+ if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, x))
+ {
+ return false;
+ }
+ if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
+ {
+ return false;
+ }
+ if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, nWidth - x - 1))
+ {
+ return false;
+ }
+ }
+ }
+
+ if (bWidthEven)
+ {
+ for (tools::Long y = 0; y < nHeightHalf; ++y)
+ {
+ if (pReadAccess->GetPixel(y, nWidthHalf) != pReadAccess->GetPixel(nHeight - y - 1, nWidthHalf))
+ {
+ return false;
+ }
+ }
+ }
+
+ if (bHeightEven)
+ {
+ Scanline pScanlineRead = pReadAccess->GetScanline( nHeightHalf );
+ for (tools::Long x = 0; x < nWidthHalf; ++x)
+ {
+ if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
+ {
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */