Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 841 insertions, 0 deletions

diff --git a/embedserv/source/embed/tracker.cxx b/embedserv/source/embed/tracker.cxx
new file mode 100644
index 000000000..2a502671b
--- /dev/null
+++ b/embedserv/source/embed/tracker.cxx
@@ -0,0 +1,841 @@
+/* -*- 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 <sal/config.h>
+
+#include <algorithm>
+
+#include <sal/types.h>
+#include <sal/log.hxx>
+
+#include <stdafx.h>
+#include <stddef.h>
+#include <syswinwrapper.hxx>
+
+// windowserrorstring.hxx includes postwin.h, which #undef OPAQUE, so "#redef" it
+#include <comphelper/windowserrorstring.hxx>
+#ifdef OPAQUE
+#error OPAQUE should not be defined!?
+#endif
+#define OPAQUE 2
+
+static HCURSOR afxCursors[10] = { nullptr, };
+static HBRUSH afxHalftoneBrush = nullptr;
+
+namespace {
+
+// the struct below is used to determine the qualities of a particular handle
+struct AFX_HANDLEINFO
+{
+    size_t nOffsetX;    // offset within RECT for X coordinate
+    size_t nOffsetY;    // offset within RECT for Y coordinate
+    int nCenterX;       // adjust X by Width()/2 * this number
+    int nCenterY;       // adjust Y by Height()/2 * this number
+    int nHandleX;       // adjust X by handle size * this number
+    int nHandleY;       // adjust Y by handle size * this number
+    int nInvertX;       // handle converts to this when X inverted
+    int nInvertY;       // handle converts to this when Y inverted
+};
+
+}
+
+// this array describes all 8 handles (clock-wise)
+const AFX_HANDLEINFO afxHandleInfo[] =
+{
+    // corner handles (top-left, top-right, bottom-right, bottom-left
+    { offsetof(RECT, left), offsetof(RECT, top),        0, 0,  0,  0, 1, 3 },
+    { offsetof(RECT, right), offsetof(RECT, top),       0, 0, -1,  0, 0, 2 },
+    { offsetof(RECT, right), offsetof(RECT, bottom),    0, 0, -1, -1, 3, 1 },
+    { offsetof(RECT, left), offsetof(RECT, bottom),     0, 0,  0, -1, 2, 0 },
+
+    // side handles (top, right, bottom, left)
+    { offsetof(RECT, left), offsetof(RECT, top),        1, 0,  0,  0, 4, 6 },
+    { offsetof(RECT, right), offsetof(RECT, top),       0, 1, -1,  0, 7, 5 },
+    { offsetof(RECT, left), offsetof(RECT, bottom),     1, 0,  0, -1, 6, 4 },
+    { offsetof(RECT, left), offsetof(RECT, top),        0, 1,  0,  0, 5, 7 }
+};
+
+namespace {
+
+// the struct below gives us information on the layout of a RECT struct and
+//  the relationship between its members
+struct AFX_RECTINFO
+{
+    size_t nOffsetAcross;   // offset of opposite point (ie. left->right)
+    int nSignAcross;        // sign relative to that point (ie. add/subtract)
+};
+
+}
+
+// this array is indexed by the offset of the RECT member / sizeof(int)
+const AFX_RECTINFO afxRectInfo[] =
+{
+    { offsetof(RECT, right), +1 },
+    { offsetof(RECT, bottom), +1 },
+    { offsetof(RECT, left), -1 },
+    { offsetof(RECT, top), -1 },
+};
+
+
+static HBRUSH HalftoneBrush()
+{
+    if (afxHalftoneBrush == nullptr)
+    {
+        WORD grayPattern[8];
+        for (int i = 0; i < 8; i++)
+            grayPattern[i] = static_cast<WORD>(0x5555 << (i & 1));
+        HBITMAP grayBitmap = CreateBitmap(8, 8, 1, 1, &grayPattern);
+        if (grayBitmap != nullptr)
+        {
+            afxHalftoneBrush = CreatePatternBrush(grayBitmap);
+            DeleteObject(grayBitmap);
+        }
+    }
+    return afxHalftoneBrush;
+}
+
+
+static void DrawDragRect(
+    HDC hDC,LPRECT lpRect,SIZE size,
+    LPRECT lpRectLast,SIZE sizeLast,
+    HBRUSH hBrush = nullptr,HBRUSH hBrushLast = nullptr)
+{
+    // first, determine the update region and select it
+    HRGN rgnNew;
+    HRGN rgnOutside,rgnInside;
+    rgnOutside = CreateRectRgnIndirect(lpRect);
+    RECT rect = *lpRect;
+    InflateRect(&rect,-size.cx, -size.cy);
+    IntersectRect(&rect,&rect,lpRect);
+    rgnInside = CreateRectRgnIndirect(&rect);
+    rgnNew = CreateRectRgn(0, 0, 0, 0);
+    CombineRgn(rgnNew,rgnOutside,rgnInside,RGN_XOR);
+
+    HBRUSH hBrushOld = nullptr;
+    if (hBrush == nullptr)
+        hBrush = HalftoneBrush();
+    if (hBrushLast == nullptr)
+        hBrushLast = hBrush;
+
+    HRGN rgnLast(nullptr);
+    HRGN rgnUpdate(nullptr);
+    if (lpRectLast != nullptr)
+    {
+        // find difference between new region and old region
+        rgnLast = CreateRectRgn(0, 0, 0, 0);
+        SetRectRgn(
+            rgnOutside,
+            lpRectLast->left,
+            lpRectLast->top,
+            lpRectLast->right,
+            lpRectLast->bottom);
+        rect = *lpRectLast;
+        InflateRect(&rect,-sizeLast.cx, -sizeLast.cy);
+        IntersectRect(&rect,&rect, lpRectLast);
+        SetRectRgn(rgnInside,rect.left,rect.top,rect.right,rect.bottom);
+        CombineRgn(rgnLast,rgnOutside,rgnInside, RGN_XOR);
+
+//      // only diff them if brushes are the same
+        if (hBrush == hBrushLast)
+        {
+            rgnUpdate = CreateRectRgn(0, 0, 0, 0);
+            CombineRgn(rgnUpdate,rgnLast,rgnNew, RGN_XOR);
+        }
+    }
+    if (hBrush != hBrushLast && lpRectLast != nullptr)
+    {
+        // brushes are different -- erase old region first
+        SelectClipRgn(hDC,rgnLast);
+        GetClipBox(hDC,&rect);
+        hBrushOld = static_cast<HBRUSH>(SelectObject(hDC,static_cast<HGDIOBJ>(hBrushLast)));
+        PatBlt(hDC,rect.left,rect.top,(rect.right-rect.left),(rect.bottom-rect.top),PATINVERT);
+
+        SelectObject(hDC,static_cast<HGDIOBJ>(hBrushOld));
+        hBrushOld = nullptr;
+    }
+
+    // draw into the update/new region
+    SelectClipRgn(hDC,rgnUpdate);
+
+    GetClipBox(hDC,&rect);
+    hBrushOld = static_cast<HBRUSH>(SelectObject(hDC, static_cast<HGDIOBJ>(hBrush)));
+    PatBlt(hDC,rect.left, rect.top,(rect.right-rect.left),(rect.bottom-rect.top), PATINVERT);
+
+    // cleanup DC
+    if (hBrushOld != nullptr)
+        SelectObject(hDC, static_cast<HGDIOBJ>(hBrushOld));
+    SelectClipRgn(hDC,nullptr);
+}
+
+
+void winwrap::TransformRect(LPRECT rect,HWND pWnd,HWND pWndClipTo)
+{
+    POINT pt;
+    pt.x = rect->left;pt.y = rect->top;
+    ClientToScreen(pWnd,&pt);
+    ScreenToClient(pWndClipTo,&pt);
+    rect->left = pt.x; rect->top = pt.y;
+
+    pt.x = rect->right;pt.y = rect->bottom;
+    ClientToScreen(pWnd,&pt);
+    ScreenToClient(pWndClipTo,&pt);
+    rect->right = pt.x; rect->bottom = pt.y;
+}
+
+
+static void NormalizeRect(LPRECT rp)
+{
+    if(rp->left > rp->right) {
+        UINT tmp = rp->left;
+        rp->left = rp->right;
+        rp->right = tmp;
+    }
+
+    if(rp->top > rp->bottom) {
+        UINT tmp = rp->top;
+        rp->top = rp->bottom;
+        rp->bottom = tmp;
+    }
+}
+
+
+using namespace winwrap;
+
+
+Tracker::Tracker()
+{
+}
+
+
+Tracker::Tracker(LPCRECT lpSrcRect, UINT nStyle)
+{
+    Construct();
+    CopyRect(&m_rect,lpSrcRect);
+    m_nStyle = nStyle;
+}
+
+static HBRUSH afxHatchBrush = nullptr;
+static HPEN afxBlackDottedPen = nullptr;
+static int afxHandleSize = 0;
+
+
+void Tracker::Construct()
+{
+    static bool bInitialized = false;
+    if (!bInitialized)
+    {
+        if (afxHatchBrush == nullptr)
+        {
+            // create the hatch pattern + bitmap
+            WORD hatchPattern[8];
+            WORD wPattern = 0x1111;
+            for (int i = 0; i < 4; i++)
+            {
+                hatchPattern[i] = wPattern;
+                hatchPattern[i+4] = wPattern;
+                wPattern <<= 1;
+            }
+            HBITMAP hatchBitmap = CreateBitmap(8, 8, 1, 1,&hatchPattern);
+
+            // create black hatched brush
+            afxHatchBrush = CreatePatternBrush(hatchBitmap);
+            DeleteObject(hatchBitmap);
+        }
+
+        if (afxBlackDottedPen == nullptr)
+        {
+            // create black dotted pen
+            afxBlackDottedPen = CreatePen(PS_DOT, 0, RGB(0, 0, 0));
+        }
+
+        // get default handle size from Windows profile setting
+        static const WCHAR szWindows[] = L"windows";
+        static const WCHAR szInplaceBorderWidth[] = L"oleinplaceborderwidth";
+        afxHandleSize = GetProfileIntW(szWindows, szInplaceBorderWidth, 4);
+        bInitialized = true;
+
+        afxCursors[0] = afxCursors[2] = LoadCursor(nullptr,IDC_SIZENWSE);
+        afxCursors[4] = afxCursors[6] = LoadCursor(nullptr,IDC_SIZENS);
+        afxCursors[1] = afxCursors[3] = LoadCursor(nullptr,IDC_SIZENESW);
+        afxCursors[5] = afxCursors[7] = LoadCursor(nullptr,IDC_SIZEWE);
+        afxCursors[8] = LoadCursor(nullptr,IDC_SIZEALL);
+    }
+
+    m_nStyle = 0;
+    m_nHandleSize = afxHandleSize;
+    m_sizeMin.cy = m_sizeMin.cx = m_nHandleSize*2;
+
+    SetRectEmpty(&m_rectLast);
+    m_sizeLast.cx = m_sizeLast.cy = 0;
+    m_bErase = FALSE;
+    m_bFinalErase =  FALSE;
+}
+
+Tracker::~Tracker()
+{
+}
+
+
+int Tracker::HitTest(POINT point) const
+{
+    TrackerHit hitResult = hitNothing;
+
+    RECT rectTrue;
+    GetTrueRect(&rectTrue);
+    NormalizeRect(&rectTrue);
+    if (PtInRect(&rectTrue,point))
+    {
+        if ((m_nStyle & (resizeInside|resizeOutside)) != 0)
+            hitResult = static_cast<TrackerHit>(HitTestHandles(point));
+        else
+            hitResult = hitMiddle;
+    }
+    return hitResult;
+}
+
+
+BOOL Tracker::SetCursor(HWND pWnd, UINT nHitTest) const
+{
+    // trackers should only be in client area
+    if (nHitTest != HTCLIENT)
+        return FALSE;
+
+    // convert cursor position to client co-ordinates
+    POINT point;
+    GetCursorPos(&point);
+    ScreenToClient(pWnd,&point);
+
+    // do hittest and normalize hit
+    int nHandle = HitTestHandles(point);
+    if (nHandle < 0)
+        return FALSE;
+
+    // need to normalize the hittest such that we get proper cursors
+    nHandle = NormalizeHit(nHandle);
+
+    // handle special case of hitting area between handles
+    //  (logically the same -- handled as a move -- but different cursor)
+    if (nHandle == hitMiddle && !PtInRect(&m_rect,point))
+    {
+        // only for trackers with hatchedBorder (ie. in-place resizing)
+        if (m_nStyle & hatchedBorder)
+            nHandle = TrackerHit(9);
+    }
+
+    ::SetCursor(afxCursors[nHandle]);
+    return TRUE;
+}
+
+
+BOOL Tracker::Track(HWND hWnd,POINT point,BOOL bAllowInvert,
+                    HWND hWndClipTo)
+{
+    // perform hit testing on the handles
+    int nHandle = HitTestHandles(point);
+    if (nHandle < 0)
+    {
+        // didn't hit a handle, so just return FALSE
+        return FALSE;
+    }
+
+    // otherwise, call helper function to do the tracking
+    m_bAllowInvert = bAllowInvert;
+    SetCursor(hWnd,nHandle);
+    return TrackHandle(nHandle, hWnd, point, hWndClipTo);
+}
+
+
+BOOL Tracker::TrackHandle(int nHandle,HWND hWnd,POINT point,HWND hWndClipTo)
+{
+    // don't handle if capture already set
+    if (GetCapture() != nullptr)
+        return FALSE;
+
+    // save original width & height in pixels
+    int nWidth = m_rect.right - m_rect.left;
+    int nHeight = m_rect.bottom - m_rect.top;
+
+    // set capture to the window which received this message
+    SetCapture(hWnd);
+    UpdateWindow(hWnd);
+    if (hWndClipTo != nullptr)
+        UpdateWindow(hWndClipTo);
+    RECT rectSave = m_rect;
+
+    // find out what x/y coords we are supposed to modify
+    int *px, *py;
+    int xDiff, yDiff;
+    GetModifyPointers(nHandle, &px, &py, &xDiff, &yDiff);
+    xDiff = point.x - xDiff;
+    yDiff = point.y - yDiff;
+
+    // get DC for drawing
+    HDC hDrawDC;
+    if (hWndClipTo != nullptr)
+    {
+        // clip to arbitrary window by using adjusted Window DC
+        hDrawDC = GetDCEx(hWndClipTo,nullptr, DCX_CACHE);
+    }
+    else
+    {
+        // otherwise, just use normal DC
+        hDrawDC = GetDC(hWnd);
+    }
+
+    RECT rectOld;
+    bool bMoved = false;
+
+    // get messages until capture lost or cancelled/accepted
+    for (;;)
+    {
+        MSG msg;
+        int const bRet = GetMessageW(&msg, nullptr, 0, 0);
+        SAL_WARN_IF(-1 == bRet, "embedserv", "GetMessageW failed: " << WindowsErrorString(GetLastError()));
+        if (-1 == bRet || 0 == bRet)
+            break;
+
+        if (GetCapture() != hWnd)
+            break;
+
+        switch (msg.message)
+        {
+            // handle movement/accept messages
+        case WM_LBUTTONUP:
+        case WM_MOUSEMOVE:
+            rectOld = m_rect;
+            // handle resize cases (and part of move)
+            if (px != nullptr)
+                *px = static_cast<int>(static_cast<short>(LOWORD(msg.lParam))) - xDiff;
+            if (py != nullptr)
+                *py = static_cast<int>(static_cast<short>(HIWORD(msg.lParam))) - yDiff;
+
+            // handle move case
+            if (nHandle == hitMiddle)
+            {
+                m_rect.right = m_rect.left + nWidth;
+                m_rect.bottom = m_rect.top + nHeight;
+            }
+            // allow caller to adjust the rectangle if necessary
+            AdjustRect(nHandle,&m_rect);
+
+            // only redraw and callback if the rect actually changed!
+            m_bFinalErase = (msg.message == WM_LBUTTONUP);
+            if (!EqualRect(&rectOld,&m_rect) || m_bFinalErase)
+            {
+                if (bMoved)
+                {
+                    m_bErase = TRUE;
+                    DrawTrackerRect(&rectOld,hWndClipTo,hDrawDC,hWnd);
+                }
+                OnChangedRect(rectOld);
+                if (msg.message != WM_LBUTTONUP)
+                    bMoved = true;
+            }
+            if (m_bFinalErase)
+                goto ExitLoop;
+
+            if (!EqualRect(&rectOld,&m_rect))
+            {
+                m_bErase = FALSE;
+                DrawTrackerRect(&m_rect,hWndClipTo,hDrawDC,hWnd);
+            }
+            break;
+
+            // handle cancel messages
+        case WM_KEYDOWN:
+            if (msg.wParam != VK_ESCAPE)
+                break;
+            [[fallthrough]];
+        case WM_RBUTTONDOWN:
+            if (bMoved)
+            {
+                m_bErase = m_bFinalErase = TRUE;
+                DrawTrackerRect(&m_rect, hWndClipTo, hDrawDC, hWnd);
+            }
+            m_rect = rectSave;
+            goto ExitLoop;
+
+            // just dispatch rest of the messages
+        default:
+            DispatchMessageW(&msg);
+            break;
+        }
+    }
+
+  ExitLoop:
+    if (hWndClipTo != nullptr)
+        ReleaseDC(hWndClipTo,hDrawDC);
+    else
+        ReleaseDC(hWnd,hDrawDC);
+    ReleaseCapture();
+
+    // restore rect in case bMoved is still FALSE
+    if (!bMoved)
+        m_rect = rectSave;
+    m_bFinalErase = FALSE;
+    m_bErase = FALSE;
+
+    // return TRUE only if rect has changed
+    return !EqualRect(&rectSave,&m_rect);
+}
+
+
+void Tracker::OnChangedRect(const RECT& /*rectOld*/)
+{
+}
+
+
+void Tracker::AdjustRect(int nHandle, LPRECT)
+{
+    if(nHandle == hitMiddle)
+        return;
+
+    // convert the handle into locations within m_rect
+    int *px, *py;
+    GetModifyPointers(nHandle, &px, &py, nullptr, nullptr);
+
+    // enforce minimum width
+    int nNewWidth = m_rect.right - m_rect.left;
+    int nAbsWidth = m_bAllowInvert ? abs(nNewWidth) : nNewWidth;
+    if (px != nullptr && nAbsWidth < m_sizeMin.cx)
+    {
+        nNewWidth = nAbsWidth != 0 ? nNewWidth / nAbsWidth : 1;
+        const AFX_RECTINFO* pRectInfo =
+            &afxRectInfo[px - reinterpret_cast<int*>(&m_rect)];
+        *px = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pRectInfo->nOffsetAcross) +
+            nNewWidth * m_sizeMin.cx * -pRectInfo->nSignAcross;
+    }
+
+    // enforce minimum height
+    int nNewHeight = m_rect.bottom - m_rect.top;
+    int nAbsHeight = m_bAllowInvert ? abs(nNewHeight) : nNewHeight;
+    if (py != nullptr && nAbsHeight < m_sizeMin.cy)
+    {
+        nNewHeight = nAbsHeight != 0 ? nNewHeight / nAbsHeight : 1;
+        const AFX_RECTINFO* pRectInfo =
+            &afxRectInfo[py - reinterpret_cast<int*>(&m_rect)];
+        *py = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pRectInfo->nOffsetAcross) +
+            nNewHeight * m_sizeMin.cy * -pRectInfo->nSignAcross;
+    }
+}
+
+
+void Tracker::DrawTrackerRect(
+    LPRECT lpRect,HWND pWndClipTo,HDC pDC,HWND pWnd)
+{
+    // first, normalize the rectangle for drawing
+    RECT rect = *lpRect;
+    NormalizeRect(&rect);
+
+    // convert to client coordinates
+    if (pWndClipTo != nullptr)
+        TransformRect(&rect,pWnd,pWndClipTo);
+
+    SIZE size;
+    size.cx = 0; size.cy = 0;
+    if (!m_bFinalErase)
+    {
+        // otherwise, size depends on the style
+        if (m_nStyle & hatchedBorder)
+        {
+            size.cx = size.cy = std::max(1,GetHandleSize(&rect)-1);
+            InflateRect(&rect,size.cx,size.cy);
+        }
+        else
+        {
+            size.cx = 1; // CX_BORDER;
+            size.cy = 1; // CY_BORDER;
+        }
+    }
+
+    // and draw it
+    if (m_bFinalErase || !m_bErase)
+        DrawDragRect(pDC,&rect,size,&m_rectLast,m_sizeLast);
+
+    // remember last rectangles
+    m_rectLast = rect;
+    m_sizeLast = size;
+}
+
+
+void Tracker::Draw(HDC hDC) const
+{
+    // set initial DC state
+    SetMapMode(hDC,MM_TEXT);
+    SetViewportOrgEx(hDC,0, 0,nullptr);
+    SetWindowOrgEx(hDC,0, 0,nullptr);
+
+    // get normalized rectangle
+    RECT rect = m_rect;
+    NormalizeRect(&rect);
+
+    HPEN pOldPen = nullptr;
+    HBRUSH pOldBrush = nullptr;
+    HGDIOBJ pTemp;
+    int nOldROP;
+
+    // draw lines
+    if ((m_nStyle & (dottedLine|solidLine)) != 0)
+    {
+        if (m_nStyle & dottedLine)
+            pOldPen = static_cast<HPEN>(SelectObject(hDC,afxBlackDottedPen));
+        else
+            pOldPen = static_cast<HPEN>(SelectObject(hDC,reinterpret_cast<HGDIOBJ>(BLACK_PEN)));
+        pOldBrush = static_cast<HBRUSH>(SelectObject(hDC,reinterpret_cast<HGDIOBJ>(NULL_BRUSH)));
+        nOldROP = SetROP2(hDC,R2_COPYPEN);
+        InflateRect(&rect,+1, +1);   // borders are one pixel outside
+        Rectangle(hDC,rect.left, rect.top, rect.right, rect.bottom);
+        SetROP2(hDC,nOldROP);
+    }
+
+    // if hatchBrush is going to be used, need to unrealize it
+    if ((m_nStyle & (hatchInside|hatchedBorder)) != 0)
+        UnrealizeObject(static_cast<HGDIOBJ>(afxHatchBrush));
+
+    // hatch inside
+    if ((m_nStyle & hatchInside) != 0)
+    {
+        pTemp = SelectObject(hDC,reinterpret_cast<HGDIOBJ>(NULL_PEN));
+        if (pOldPen == nullptr)
+            pOldPen = static_cast<HPEN>(pTemp);
+        pTemp = SelectObject(hDC,static_cast<HGDIOBJ>(afxHatchBrush));
+        if (pOldBrush == nullptr)
+            pOldBrush = static_cast<HBRUSH>(pTemp);
+        SetBkMode(hDC,TRANSPARENT);
+        nOldROP = SetROP2(hDC,R2_MASKNOTPEN);
+        Rectangle(hDC,rect.left+1, rect.top+1, rect.right, rect.bottom);
+        SetROP2(hDC,nOldROP);
+    }
+
+    // draw hatched border
+    if ((m_nStyle & hatchedBorder) != 0)
+    {
+        pTemp = SelectObject(hDC,static_cast<HGDIOBJ>(afxHatchBrush));
+        if (pOldBrush == nullptr)
+            pOldBrush = static_cast<HBRUSH>(pTemp);
+        SetBkMode(hDC,OPAQUE);
+        RECT rectTrue;
+        GetTrueRect(&rectTrue);
+        PatBlt(hDC,rectTrue.left, rectTrue.top, rectTrue.right-rectTrue.left,
+               rect.top-rectTrue.top, 0x000F0001 /* Pn */);
+        PatBlt(hDC,rectTrue.left, rect.bottom,
+               rectTrue.right-rectTrue.left,
+               rectTrue.bottom-rect.bottom, 0x000F0001 /* Pn */);
+        PatBlt(hDC,rectTrue.left, rect.top, rect.left-rectTrue.left,
+               rect.bottom-rect.top, 0x000F0001 /* Pn */);
+        PatBlt(hDC,rect.right, rect.top, rectTrue.right-rect.right,
+               rect.bottom-rect.top, 0x000F0001 /* Pn */);
+    }
+
+    // draw resize handles
+    if ((m_nStyle & (resizeInside|resizeOutside)) != 0)
+    {
+        UINT mask = GetHandleMask();
+        HBRUSH hbrush = CreateSolidBrush(RGB(0,0,0));
+        for (int i = 0; i < 8; ++i)
+        {
+            if (mask & (1<<i))
+            {
+                GetHandleRect(static_cast<TrackerHit>(i), &rect);
+                // FillSolidRect(hDC,rect, RGB(0, 0, 0));
+                FillRect(hDC,&rect,hbrush);
+            }
+        }
+        DeleteObject(hbrush);
+    }
+
+    // cleanup pDC state
+    if (pOldPen != nullptr)
+        SelectObject(hDC,pOldPen);
+    if (pOldBrush != nullptr)
+        SelectObject(hDC,pOldBrush);
+    RestoreDC(hDC,-1);
+}
+
+
+void Tracker::GetHandleRect(int nHandle,RECT* pHandleRect) const
+{
+    // get normalized rectangle of the tracker
+    RECT rectT = m_rect;
+    NormalizeRect(&rectT);
+    if ((m_nStyle & (solidLine|dottedLine)) != 0)
+        InflateRect(&rectT,+1, +1);
+
+    // since the rectangle itself was normalized, we also have to invert the
+    //  resize handles.
+    nHandle = NormalizeHit(nHandle);
+
+    // handle case of resize handles outside the tracker
+    int size = GetHandleSize();
+    if (m_nStyle & resizeOutside)
+        InflateRect(&rectT,size-1, size-1);
+
+    // calculate position of the resize handle
+    int nWidth = rectT.right - rectT.left;
+    int nHeight = rectT.bottom - rectT.top;
+    RECT rect;
+    const AFX_HANDLEINFO* pHandleInfo = &afxHandleInfo[nHandle];
+    rect.left = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&rectT) + pHandleInfo->nOffsetX);
+    rect.top = *reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&rectT) + pHandleInfo->nOffsetY);
+    rect.left += size * pHandleInfo->nHandleX;
+    rect.top += size * pHandleInfo->nHandleY;
+    rect.left += pHandleInfo->nCenterX * (nWidth - size) / 2;
+    rect.top += pHandleInfo->nCenterY * (nHeight - size) / 2;
+    rect.right = rect.left + size;
+    rect.bottom = rect.top + size;
+
+    *pHandleRect = rect;
+}
+
+
+int Tracker::GetHandleSize(LPRECT lpRect) const
+{
+    LPCRECT rect = lpRect == nullptr ? &m_rect : lpRect;
+
+    int size = m_nHandleSize;
+    if (!(m_nStyle & resizeOutside))
+    {
+        // make sure size is small enough for the size of the rect
+        int sizeMax = std::min(abs(rect->right - rect->left),
+                          abs(rect->bottom - rect->top));
+        if (size * 2 > sizeMax)
+            size = sizeMax / 2;
+    }
+    return size;
+}
+
+
+UINT Tracker::GetHandleMask() const
+{
+    UINT mask = 0x0F;   // always have 4 corner handles
+    int size = m_nHandleSize*3;
+    if (abs(m_rect.right - m_rect.left) - size > 4)
+        mask |= 0x50;
+    if (abs(m_rect.bottom - m_rect.top) - size > 4)
+        mask |= 0xA0;
+    return mask;
+}
+
+
+void Tracker::GetTrueRect(LPRECT lpTrueRect) const
+{
+    RECT rect = m_rect;
+    NormalizeRect(&rect);
+    int nInflateBy = 0;
+    if ((m_nStyle & (resizeOutside|hatchedBorder)) != 0)
+        nInflateBy += GetHandleSize() - 1;
+    if ((m_nStyle & (solidLine|dottedLine)) != 0)
+        ++nInflateBy;
+    InflateRect(&rect,nInflateBy, nInflateBy);
+    *lpTrueRect = rect;
+}
+
+
+int Tracker::NormalizeHit(int nHandle) const
+{
+    if (nHandle == hitMiddle || nHandle == hitNothing)
+        return nHandle;
+    const AFX_HANDLEINFO* pHandleInfo = &afxHandleInfo[nHandle];
+    if (m_rect.right - m_rect.left < 0)
+    {
+        nHandle = static_cast<TrackerHit>(pHandleInfo->nInvertX);
+        pHandleInfo = &afxHandleInfo[nHandle];
+    }
+    if (m_rect.bottom - m_rect.top < 0)
+        nHandle = static_cast<TrackerHit>(pHandleInfo->nInvertY);
+    return nHandle;
+}
+
+
+int Tracker::HitTestHandles(POINT point) const
+{
+    RECT rect;
+    UINT mask = GetHandleMask();
+
+    // see if hit anywhere inside the tracker
+    GetTrueRect(&rect);
+    if (!PtInRect(&rect,point))
+        return hitNothing;  // totally missed
+
+    // see if we hit a handle
+    for (int i = 0; i < 8; ++i)
+    {
+        if (mask & (1<<i))
+        {
+            GetHandleRect(static_cast<TrackerHit>(i), &rect);
+            if (PtInRect(&rect,point))
+                return static_cast<TrackerHit>(i);
+        }
+    }
+
+    // last of all, check for non-hit outside of object, between resize handles
+    if ((m_nStyle & hatchedBorder) == 0)
+    {
+        rect = m_rect;
+        NormalizeRect(&rect);
+        if ((m_nStyle & (dottedLine|solidLine)) != 0)
+            InflateRect(&rect,+1, +1);
+        if (!PtInRect(&rect,point))
+            return hitNothing;  // must have been between resize handles
+    }
+    return hitMiddle;   // no handle hit, but hit object (or object border)
+}
+
+
+void Tracker::GetModifyPointers(
+    int nHandle, int** ppx, int** ppy, int* px, int* py)
+{
+    if (nHandle == hitMiddle)
+        nHandle = hitTopLeft;   // same as hitting top-left
+
+    *ppx = nullptr;
+    *ppy = nullptr;
+
+    // fill in the part of the rect that this handle modifies
+    //  (Note: handles that map to themselves along a given axis when that
+    //   axis is inverted don't modify the value on that axis)
+
+    const AFX_HANDLEINFO* pHandleInfo = &afxHandleInfo[nHandle];
+    if (pHandleInfo->nInvertX != nHandle)
+    {
+        *ppx = reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pHandleInfo->nOffsetX);
+        if (px != nullptr)
+            *px = **ppx;
+    }
+    else
+    {
+        // middle handle on X axis
+        if (px != nullptr)
+            *px = m_rect.left + (m_rect.left-m_rect.right) / 2;
+    }
+    if (pHandleInfo->nInvertY != nHandle)
+    {
+        *ppy = reinterpret_cast<int*>(reinterpret_cast<BYTE*>(&m_rect) + pHandleInfo->nOffsetY);
+        if (py != nullptr)
+            *py = **ppy;
+    }
+    else
+    {
+        // middle handle on Y axis
+        if (py != nullptr)
+            *py = m_rect.top + (m_rect.top-m_rect.bottom) / 2;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */