1 files changed, 175 insertions, 0 deletions
diff --git a/vcl/skia/x11/gdiimpl.cxx b/vcl/skia/x11/gdiimpl.cxx
new file mode 100644
index 0000000000..6a7cce14dd
--- /dev/null
+++ b/vcl/skia/x11/gdiimpl.cxx
@@ -0,0 +1,175 @@
+/* -*- 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/.
+ *
+ * Some of this code is based on Skia source code, covered by the following
+ * license notice (see readlicense_oo for the full license):
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ */
+
+#include <skia/x11/gdiimpl.hxx>
+
+#include <tools/sk_app/unix/WindowContextFactory_unix.h>
+
+#include <skia/utils.hxx>
+#include <skia/zone.hxx>
+
+#include <X11/Xutil.h>
+
+using namespace SkiaHelper;
+
+X11SkiaSalGraphicsImpl::X11SkiaSalGraphicsImpl(X11SalGraphics& rParent)
+    : SkiaSalGraphicsImpl(rParent, rParent.GetGeometryProvider())
+    , mX11Parent(rParent)
+{
+}
+
+void X11SkiaSalGraphicsImpl::Init()
+{
+    // The m_pFrame and m_pVDev pointers are updated late in X11
+    setProvider(mX11Parent.GetGeometryProvider());
+    SkiaSalGraphicsImpl::Init();
+}
+
+void X11SkiaSalGraphicsImpl::createWindowSurfaceInternal(bool forceRaster)
+{
+    assert(!mWindowContext);
+    assert(!mSurface);
+    assert(mX11Parent.GetDrawable() != None);
+    RenderMethod renderMethod = forceRaster ? RenderRaster : renderMethodToUse();
+    mScaling = getWindowScaling();
+    mWindowContext = createWindowContext(mX11Parent.GetXDisplay(), mX11Parent.GetDrawable(),
+                                         &mX11Parent.GetVisual(), GetWidth() * mScaling,
+                                         GetHeight() * mScaling, renderMethod, false);
+    if (mWindowContext)
+    {
+        // See flushSurfaceToWindowContext().
+        if (renderMethod == RenderRaster)
+            mSurface = mWindowContext->getBackbufferSurface();
+        else
+            mSurface = createSkSurface(GetWidth(), GetHeight());
+    }
+}
+
+std::unique_ptr<sk_app::WindowContext>
+X11SkiaSalGraphicsImpl::createWindowContext(Display* display, Drawable drawable,
+                                            const XVisualInfo* visual, int width, int height,
+                                            RenderMethod renderMethod, bool temporary)
+{
+    SkiaZone zone;
+    sk_app::DisplayParams displayParams;
+    displayParams.fColorType = kN32_SkColorType;
+#if defined LINUX
+    // WORKAROUND: VSync causes freezes that can even temporarily freeze the entire desktop.
+    // This happens even with the latest 450.66 drivers despite them claiming a fix for vsync.
+    // https://forums.developer.nvidia.com/t/hangs-freezes-when-vulkan-v-sync-vk-present-mode-fifo-khr-is-enabled/67751
+    if (getVendor() == DriverBlocklist::VendorNVIDIA)
+        displayParams.fDisableVsync = true;
+#endif
+    sk_app::window_context_factory::XlibWindowInfo winInfo;
+    assert(display);
+    winInfo.fDisplay = display;
+    winInfo.fWindow = drawable;
+    winInfo.fFBConfig = nullptr; // not used
+    winInfo.fVisualInfo = const_cast<XVisualInfo*>(visual);
+    assert(winInfo.fVisualInfo->visual != nullptr); // make sure it's not an uninitialized SalVisual
+    winInfo.fWidth = width;
+    winInfo.fHeight = height;
+#if defined DBG_UTIL && !defined NDEBUG
+    // Our patched Skia has VulkanWindowContext that shares grDirectContext, which requires
+    // that the X11 visual is always the same. Ensure it is so.
+    static VisualID checkVisualID = -1U;
+    // Exception is for the temporary case during startup, when SkiaHelper's
+    // checkDeviceDenylisted() needs a WindowContext and may be called before SalVisual
+    // is ready.
+    if (!temporary)
+    {
+        assert(checkVisualID == -1U || winInfo.fVisualInfo->visualid == checkVisualID);
+        checkVisualID = winInfo.fVisualInfo->visualid;
+    }
+#else
+    (void)temporary;
+#endif
+    switch (renderMethod)
+    {
+        case RenderRaster:
+            // Make sure we ask for color type that matches the X11 visual. If red mask
+            // is larger value than blue mask, then on little endian this means blue is first.
+            // This should also preferably match SK_R32_SHIFT set in config_skia.h, as that
+            // improves performance, the common setup seems to be BGRA (possibly because of
+            // choosing OpenGL-capable visual).
+            displayParams.fColorType
+                = (visual->red_mask > visual->blue_mask ? kBGRA_8888_SkColorType
+                                                        : kRGBA_8888_SkColorType);
+            return sk_app::window_context_factory::MakeRasterForXlib(winInfo, displayParams);
+        case RenderVulkan:
+            return sk_app::window_context_factory::MakeVulkanForXlib(winInfo, displayParams);
+        case RenderMetal:
+            abort();
+            break;
+    }
+    abort();
+}
+
+bool X11SkiaSalGraphicsImpl::avoidRecreateByResize() const
+{
+    if (SkiaSalGraphicsImpl::avoidRecreateByResize())
+        return true;
+    if (!mSurface || isOffscreen())
+        return false;
+    // Skia's WindowContext uses actual dimensions of the X window, which due to X11 being
+    // asynchronous may be temporarily different from what VCL thinks are the dimensions.
+    // That can lead to us repeatedly calling recreateSurface() because of "incorrect"
+    // size, and we otherwise need to check for size changes, because VCL does not inform us.
+    // Avoid the problem here by checking the size of the X window and bail out if Skia
+    // would just return the same size as it is now.
+    Window r;
+    int x, y;
+    unsigned int w, h, border, depth;
+    XGetGeometry(mX11Parent.GetXDisplay(), mX11Parent.GetDrawable(), &r, &x, &y, &w, &h, &border,
+                 &depth);
+    return mSurface->width() == int(w) && mSurface->height() == int(h);
+}
+
+void X11SkiaSalGraphicsImpl::freeResources() {}
+
+void X11SkiaSalGraphicsImpl::Flush() { performFlush(); }
+
+std::unique_ptr<sk_app::WindowContext> createVulkanWindowContext(bool temporary)
+{
+    SalDisplay* salDisplay = vcl_sal::getSalDisplay(GetGenericUnixSalData());
+    const XVisualInfo* visual;
+    XVisualInfo* visuals = nullptr;
+    if (!temporary)
+        visual = &salDisplay->GetVisual(salDisplay->GetDefaultXScreen());
+    else
+    {
+        // SalVisual from salDisplay may not be setup yet at this point, get
+        // info for the default visual.
+        XVisualInfo search;
+        search.visualid = XVisualIDFromVisual(
+            DefaultVisual(salDisplay->GetDisplay(), salDisplay->GetDefaultXScreen().getXScreen()));
+        int count;
+        visuals = XGetVisualInfo(salDisplay->GetDisplay(), VisualIDMask, &search, &count);
+        assert(count == 1);
+        visual = visuals;
+    }
+    std::unique_ptr<sk_app::WindowContext> ret = X11SkiaSalGraphicsImpl::createWindowContext(
+        salDisplay->GetDisplay(), None, visual, 1, 1, RenderVulkan, temporary);
+    if (temporary)
+        XFree(visuals);
+    return ret;
+}
+
+void X11SkiaSalGraphicsImpl::prepareSkia() { SkiaHelper::prepareSkia(createVulkanWindowContext); }
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */