1 files changed, 226 insertions, 0 deletions
diff --git a/vcl/headless/BitmapHelper.cxx b/vcl/headless/BitmapHelper.cxx
new file mode 100644
index 0000000000..2cdf502fc9
--- /dev/null
+++ b/vcl/headless/BitmapHelper.cxx
@@ -0,0 +1,226 @@
+/* -*- 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <headless/BitmapHelper.hxx>
+#include <svdata.hxx>
+#include <utility>
+
+BitmapHelper::BitmapHelper(const SalBitmap& rSourceBitmap, const bool bForceARGB32)
+#ifdef HAVE_CAIRO_FORMAT_RGB24_888
+    : m_bForceARGB32(bForceARGB32)
+#endif
+{
+    const SvpSalBitmap& rSrcBmp = static_cast<const SvpSalBitmap&>(rSourceBitmap);
+#ifdef HAVE_CAIRO_FORMAT_RGB24_888
+    if ((rSrcBmp.GetBitCount() != 32 && rSrcBmp.GetBitCount() != 24) || bForceARGB32)
+#else
+    (void)bForceARGB32;
+    if (rSrcBmp.GetBitCount() != 32)
+#endif
+    {
+        //big stupid copy here
+        const BitmapBuffer* pSrc = rSrcBmp.GetBuffer();
+        const SalTwoRect aTwoRect
+            = { 0, 0, pSrc->mnWidth, pSrc->mnHeight, 0, 0, pSrc->mnWidth, pSrc->mnHeight };
+        std::optional<BitmapBuffer> pTmp
+            = (pSrc->mnFormat == SVP_24BIT_FORMAT
+                   ? FastConvert24BitRgbTo32BitCairo(pSrc)
+                   : StretchAndConvert(*pSrc, aTwoRect, SVP_CAIRO_FORMAT));
+        aTmpBmp.Create(std::move(pTmp));
+
+        assert(aTmpBmp.GetBitCount() == 32);
+        implSetSurface(CairoCommon::createCairoSurface(aTmpBmp.GetBuffer()));
+    }
+    else
+    {
+        implSetSurface(CairoCommon::createCairoSurface(rSrcBmp.GetBuffer()));
+    }
+}
+
+void BitmapHelper::mark_dirty() { cairo_surface_mark_dirty(implGetSurface()); }
+
+unsigned char* BitmapHelper::getBits(sal_Int32& rStride)
+{
+    cairo_surface_flush(implGetSurface());
+
+    unsigned char* mask_data = cairo_image_surface_get_data(implGetSurface());
+
+    const cairo_format_t nFormat = cairo_image_surface_get_format(implGetSurface());
+#ifdef HAVE_CAIRO_FORMAT_RGB24_888
+    if (!m_bForceARGB32)
+        assert(nFormat == CAIRO_FORMAT_RGB24_888 && "Expected RGB24_888 image");
+    else
+#endif
+    {
+        assert(nFormat == CAIRO_FORMAT_ARGB32
+               && "need to implement CAIRO_FORMAT_A1 after all here");
+    }
+
+    rStride
+        = cairo_format_stride_for_width(nFormat, cairo_image_surface_get_width(implGetSurface()));
+
+    return mask_data;
+}
+
+MaskHelper::MaskHelper(const SalBitmap& rAlphaBitmap)
+{
+    const SvpSalBitmap& rMask = static_cast<const SvpSalBitmap&>(rAlphaBitmap);
+    const BitmapBuffer* pMaskBuf = rMask.GetBuffer();
+    assert(rAlphaBitmap.GetBitCount() == 8 && "we only support 8-bit masks now");
+
+    implSetSurface(cairo_image_surface_create_for_data(pMaskBuf->mpBits, CAIRO_FORMAT_A8,
+                                                       pMaskBuf->mnWidth, pMaskBuf->mnHeight,
+                                                       pMaskBuf->mnScanlineSize));
+}
+
+namespace
+{
+// check for env var that decides for using downscale pattern
+const char* pDisableDownScale(getenv("SAL_DISABLE_CAIRO_DOWNSCALE"));
+bool bDisableDownScale(nullptr != pDisableDownScale);
+
+sal_Int64 estimateUsageInBytesForSurfaceHelper(const SurfaceHelper* pHelper)
+{
+    sal_Int64 nRetval(0);
+
+    if (nullptr != pHelper)
+    {
+        cairo_surface_t* pSurface(pHelper->getSurface());
+
+        if (pSurface)
+        {
+            const tools::Long nStride(cairo_image_surface_get_stride(pSurface));
+            const tools::Long nHeight(cairo_image_surface_get_height(pSurface));
+
+            nRetval = nStride * nHeight;
+
+            // if we do downscale, size will grow by 1/4 + 1/16 + 1/32 + ...,
+            // rough estimation just multiplies by 1.25, should be good enough
+            // for estimation of buffer survival time
+            if (!bDisableDownScale)
+            {
+                nRetval = (nRetval * 5) / 4;
+            }
+        }
+    }
+
+    return nRetval;
+}
+
+} // end anonymous namespace
+
+SystemDependentData_BitmapHelper::SystemDependentData_BitmapHelper(
+    std::shared_ptr<BitmapHelper> xBitmapHelper)
+    : basegfx::SystemDependentData(Application::GetSystemDependentDataManager())
+    , maBitmapHelper(std::move(xBitmapHelper))
+{
+}
+
+sal_Int64 SystemDependentData_BitmapHelper::estimateUsageInBytes() const
+{
+    return estimateUsageInBytesForSurfaceHelper(maBitmapHelper.get());
+}
+
+SystemDependentData_MaskHelper::SystemDependentData_MaskHelper(
+    std::shared_ptr<MaskHelper> xMaskHelper)
+    : basegfx::SystemDependentData(Application::GetSystemDependentDataManager())
+    , maMaskHelper(std::move(xMaskHelper))
+{
+}
+
+sal_Int64 SystemDependentData_MaskHelper::estimateUsageInBytes() const
+{
+    return estimateUsageInBytesForSurfaceHelper(maMaskHelper.get());
+}
+
+namespace
+{
+// MM02 decide to use buffers or not
+const char* pDisableMM02Goodies(getenv("SAL_DISABLE_MM02_GOODIES"));
+bool bUseBuffer(nullptr == pDisableMM02Goodies);
+const tools::Long nMinimalSquareSizeToBuffer(64 * 64);
+}
+
+void tryToUseSourceBuffer(const SalBitmap& rSourceBitmap, std::shared_ptr<BitmapHelper>& rSurface)
+{
+    // MM02 try to access buffered BitmapHelper
+    std::shared_ptr<SystemDependentData_BitmapHelper> pSystemDependentData_BitmapHelper;
+    const bool bBufferSource(bUseBuffer
+                             && rSourceBitmap.GetSize().Width() * rSourceBitmap.GetSize().Height()
+                                    > nMinimalSquareSizeToBuffer);
+
+    if (bBufferSource)
+    {
+        pSystemDependentData_BitmapHelper
+            = rSourceBitmap.getSystemDependentData<SystemDependentData_BitmapHelper>();
+
+        if (pSystemDependentData_BitmapHelper)
+        {
+            // reuse buffered data
+            rSurface = pSystemDependentData_BitmapHelper->getBitmapHelper();
+        }
+    }
+
+    if (rSurface)
+        return;
+
+    // create data on-demand
+    rSurface = std::make_shared<BitmapHelper>(rSourceBitmap);
+
+    if (bBufferSource)
+    {
+        // add to buffering mechanism to potentially reuse next time
+        rSourceBitmap.addOrReplaceSystemDependentData<SystemDependentData_BitmapHelper>(rSurface);
+    }
+}
+
+void tryToUseMaskBuffer(const SalBitmap& rMaskBitmap, std::shared_ptr<MaskHelper>& rMask)
+{
+    // MM02 try to access buffered MaskHelper
+    std::shared_ptr<SystemDependentData_MaskHelper> pSystemDependentData_MaskHelper;
+    const bool bBufferMask(bUseBuffer
+                           && rMaskBitmap.GetSize().Width() * rMaskBitmap.GetSize().Height()
+                                  > nMinimalSquareSizeToBuffer);
+
+    if (bBufferMask)
+    {
+        pSystemDependentData_MaskHelper
+            = rMaskBitmap.getSystemDependentData<SystemDependentData_MaskHelper>();
+
+        if (pSystemDependentData_MaskHelper)
+        {
+            // reuse buffered data
+            rMask = pSystemDependentData_MaskHelper->getMaskHelper();
+        }
+    }
+
+    if (rMask)
+        return;
+
+    // create data on-demand
+    rMask = std::make_shared<MaskHelper>(rMaskBitmap);
+
+    if (bBufferMask)
+    {
+        // add to buffering mechanism to potentially reuse next time
+        rMaskBitmap.addOrReplaceSystemDependentData<SystemDependentData_MaskHelper>(rMask);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */