From f215e02bf85f68d3a6106c2a1f4f7f063f819064 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:17:27 +0200
Subject: Adding upstream version 7.0.14-dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/VBox/Frontends/VBoxFB/Helper.cpp | 106 +++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/VBox/Frontends/VBoxFB/Helper.cpp

(limited to 'src/VBox/Frontends/VBoxFB/Helper.cpp')

diff --git a/src/VBox/Frontends/VBoxFB/Helper.cpp b/src/VBox/Frontends/VBoxFB/Helper.cpp
new file mode 100644
index 00000000..544ea323
--- /dev/null
+++ b/src/VBox/Frontends/VBoxFB/Helper.cpp
@@ -0,0 +1,106 @@
+/* $Id: Helper.cpp $ */
+/** @file
+ * VBoxFB - Helper routines.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "VBoxFB.h"
+#include "Helper.h"
+
+/**
+ * Globals
+ */
+videoMode g_videoModes[MAX_VIDEOMODES] = {{0}};
+uint32_t g_numVideoModes = 0;
+
+/**
+ * callback handler for populating the supported video modes
+ *
+ * @returns callback success indicator
+ * @param   width        width in pixels of the current video mode
+ * @param   height       height in pixels of the current video mode
+ * @param   bpp          bits per pixel of the current video mode
+ * @param   callbackdata user data pointer
+ */
+DFBEnumerationResult enumVideoModesHandler(int width, int height, int bpp, void *callbackdata)
+{
+    RT_NOREF(callbackdata);
+    if (g_numVideoModes >= MAX_VIDEOMODES)
+    {
+        return DFENUM_CANCEL;
+    }
+    // don't take palette based modes
+    if (bpp >= 16)
+    {
+        // don't take modes we already have (I have seen many cases where
+        // DirectFB returns the same modes several times)
+        int32_t existingMode = getBestVideoMode(width, height, bpp);
+        if (   existingMode == -1
+            || g_videoModes[existingMode].width  != (uint32_t)width
+            || g_videoModes[existingMode].height != (uint32_t)height
+            || g_videoModes[existingMode].bpp    != (uint32_t)bpp)
+        {
+            g_videoModes[g_numVideoModes].width  = (uint32_t)width;
+            g_videoModes[g_numVideoModes].height = (uint32_t)height;
+            g_videoModes[g_numVideoModes].bpp    = (uint32_t)bpp;
+            g_numVideoModes++;
+        }
+    }
+    return DFENUM_OK;
+}
+
+/**
+ * Returns the best fitting video mode for the given characteristics.
+ *
+ * @returns index of the best video mode, -1 if no suitable mode found
+ * @param   width  requested width
+ * @param   height requested height
+ * @param   bpp    requested bit depth
+ */
+int32_t getBestVideoMode(uint32_t width, uint32_t height, uint32_t bpp)
+{
+    int32_t bestMode = -1;
+
+    for (uint32_t i = 0; i < g_numVideoModes; i++)
+    {
+        // is this mode compatible?
+        if (g_videoModes[i].width >= width && g_videoModes[i].height >= height && g_videoModes[i].bpp >= bpp)
+        {
+            // first suitable mode?
+            if (bestMode == -1)
+                bestMode = i;
+            else
+            {
+                // is it better than the one we got before?
+                if (   g_videoModes[i].width  < g_videoModes[bestMode].width
+                    || g_videoModes[i].height < g_videoModes[bestMode].height
+                    || g_videoModes[i].bpp    < g_videoModes[bestMode].bpp)
+                {
+                    bestMode = i;
+                }
+            }
+        }
+    }
+    return bestMode;
+}
-- 
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