1 files changed, 128 insertions, 0 deletions
diff --git a/include/vcl/BitmapWriteAccess.hxx b/include/vcl/BitmapWriteAccess.hxx
new file mode 100644
index 0000000000..9027210adb
--- /dev/null
+++ b/include/vcl/BitmapWriteAccess.hxx
@@ -0,0 +1,128 @@
+/* -*- 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/.
+ *
+ */
+#pragma once
+
+#include <vcl/alpha.hxx>
+#include <vcl/bitmap.hxx>
+#include <vcl/BitmapReadAccess.hxx>
+#include <optional>
+
+class VCL_DLLPUBLIC BitmapWriteAccess final : public BitmapReadAccess
+{
+public:
+    BitmapWriteAccess(Bitmap& rBitmap);
+    BitmapWriteAccess(AlphaMask& rBitmap);
+    virtual ~BitmapWriteAccess() override;
+
+    void CopyScanline(tools::Long nY, const BitmapReadAccess& rReadAcc);
+    void CopyScanline(tools::Long nY, ConstScanline aSrcScanline, ScanlineFormat nSrcScanlineFormat,
+                      sal_uInt32 nSrcScanlineSize);
+
+    void SetPalette(const BitmapPalette& rPalette)
+    {
+        assert(mpBuffer && "Access is not valid!");
+
+        mpBuffer->maPalette = rPalette;
+    }
+
+    void SetPaletteEntryCount(sal_uInt16 nCount)
+    {
+        assert(mpBuffer && "Access is not valid!");
+
+        mpBuffer->maPalette.SetEntryCount(nCount);
+    }
+
+    void SetPaletteColor(sal_uInt16 nColor, const BitmapColor& rBitmapColor)
+    {
+        assert(mpBuffer && "Access is not valid!");
+        assert(HasPalette() && "Bitmap has no palette!");
+
+        mpBuffer->maPalette[nColor] = rBitmapColor;
+    }
+
+    void SetPixel(tools::Long nY, tools::Long nX, const BitmapColor& rBitmapColor)
+    {
+        assert(mpBuffer && "Access is not valid!");
+        assert(nX < mpBuffer->mnWidth && "x-coordinate out of range!");
+        assert(nY < mpBuffer->mnHeight && "y-coordinate out of range!");
+
+        mFncSetPixel(GetScanline(nY), nX, rBitmapColor, maColorMask);
+    }
+
+    void SetPixelIndex(tools::Long nY, tools::Long nX, sal_uInt8 cIndex)
+    {
+        SetPixel(nY, nX, BitmapColor(cIndex));
+    }
+
+    void SetLineColor(const Color& rColor);
+
+    void SetFillColor();
+    void SetFillColor(const Color& rColor);
+
+    void Erase(const Color& rColor);
+
+    void DrawLine(const Point& rStart, const Point& rEnd);
+
+    void FillRect(const tools::Rectangle& rRect);
+    void DrawRect(const tools::Rectangle& rRect);
+
+private:
+    std::optional<BitmapColor> mpLineColor;
+    std::optional<BitmapColor> mpFillColor;
+
+    BitmapWriteAccess() = delete;
+    BitmapWriteAccess(const BitmapWriteAccess&) = delete;
+    BitmapWriteAccess& operator=(const BitmapWriteAccess&) = delete;
+};
+
+class BitmapScopedWriteAccess
+{
+public:
+    BitmapScopedWriteAccess(Bitmap& rBitmap)
+        : moAccess(rBitmap)
+    {
+    }
+    BitmapScopedWriteAccess(AlphaMask& rBitmap)
+        : moAccess(rBitmap)
+    {
+    }
+    BitmapScopedWriteAccess() {}
+
+    BitmapScopedWriteAccess& operator=(Bitmap& rBitmap)
+    {
+        moAccess.emplace(rBitmap);
+        return *this;
+    }
+
+    BitmapScopedWriteAccess& operator=(AlphaMask& rBitmap)
+    {
+        moAccess.emplace(rBitmap);
+        return *this;
+    }
+
+    bool operator!() const { return !moAccess.has_value() || !*moAccess; }
+    explicit operator bool() const { return moAccess && bool(*moAccess); }
+
+    void reset() { moAccess.reset(); }
+
+    BitmapWriteAccess* get() { return moAccess ? &*moAccess : nullptr; }
+    const BitmapWriteAccess* get() const { return moAccess ? &*moAccess : nullptr; }
+
+    BitmapWriteAccess* operator->() { return &*moAccess; }
+    const BitmapWriteAccess* operator->() const { return &*moAccess; }
+
+    BitmapWriteAccess& operator*() { return *moAccess; }
+    const BitmapWriteAccess& operator*() const { return *moAccess; }
+
+private:
+    std::optional<BitmapWriteAccess> moAccess;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */