From fd1467e3a2e35d0800675317ead788cdea1adf2f Mon Sep 17 00:00:00 2001
From: James Tabor <james.tabor@reactos.org>
Date: Thu, 18 Jan 2007 13:56:58 +0000
Subject: [PATCH] Add Arc.c to win32k. See gdi32 painting.c for more info.

svn path=/trunk/; revision=25508
---
 reactos/subsystems/win32/win32k/objects/arc.c | 132 ++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 reactos/subsystems/win32/win32k/objects/arc.c

diff --git a/reactos/subsystems/win32/win32k/objects/arc.c b/reactos/subsystems/win32/win32k/objects/arc.c
new file mode 100644
index 00000000000..dedbbdf3536
--- /dev/null
+++ b/reactos/subsystems/win32/win32k/objects/arc.c
@@ -0,0 +1,132 @@
+
+#include <w32k.h>
+
+#define NDEBUG
+#include <debug.h>
+
+static BOOL FASTCALL
+IntArc( DC *dc, int LeftRect, int TopRect, int RightRect, int BottomRect,
+        int XStartArc, int YStartArc, int XEndArc, int YEndArc, ARCTYPE arctype)
+{
+  return TRUE;
+}
+
+BOOL FASTCALL
+IntGdiArcInternal(
+          ARCTYPE arctype,
+          DC  *dc,
+          int LeftRect,
+          int TopRect,
+          int RightRect,
+          int BottomRect,
+          int XStartArc,
+          int YStartArc,
+          int XEndArc,
+          int YEndArc)
+{
+  INT rx, ry;
+  RECT rc, rc1;
+
+  if(PATH_IsPathOpen(dc->w.path))
+  {
+    INT type = arctype;
+    if (arctype == GdiTypeArcTo) type = GdiTypeArc;
+    return PATH_Arc(dc, LeftRect, TopRect, RightRect, BottomRect,
+                    XStartArc, YStartArc, XEndArc, YEndArc, type);
+  }
+
+  IntGdiSetRect(&rc, LeftRect, TopRect, RightRect, BottomRect);
+  IntGdiSetRect(&rc1, XStartArc, YStartArc, XEndArc, YEndArc);
+
+  if (dc->w.flags & DCX_WINDOW) //window rectangle instead of client rectangle
+  {
+    HWND hWnd;
+    PWINDOW_OBJECT Window;
+
+    hWnd = IntWindowFromDC(dc->hSelf);
+    Window = UserGetWindowObject(hWnd);
+    if(!Window) return FALSE;
+
+    rc.left += Window->ClientRect.left;
+    rc.top += Window->ClientRect.top;
+    rc.right += Window->ClientRect.left;
+    rc.bottom += Window->ClientRect.top;
+
+    rc1.left += Window->ClientRect.left;
+    rc1.top += Window->ClientRect.top;
+    rc1.right += Window->ClientRect.left;
+    rc1.bottom += Window->ClientRect.top;
+  }
+
+  rx = (rc.right - rc.left)/2 - 1;
+  ry = (rc.bottom - rc.top)/2 -1;
+  rc.left += rx;
+  rc.top += ry;
+
+  return  IntArc( dc, rc.left, rc.top, rx, ry,
+          rc1.left, rc1.top, rc1.right, rc1.bottom, arctype);
+}
+
+BOOL
+STDCALL
+NtGdiArcInternal(
+        ARCTYPE arctype,
+        HDC  hDC,
+        int  LeftRect,
+        int  TopRect,
+        int  RightRect,
+        int  BottomRect,
+        int  XStartArc,
+        int  YStartArc,
+        int  XEndArc,
+        int  YEndArc)
+{
+  DC *dc;
+  BOOL Ret;
+
+  dc = DC_LockDc (hDC);
+  if(!dc)
+  {
+    SetLastWin32Error(ERROR_INVALID_HANDLE);
+    return FALSE;
+  }
+  if (dc->IsIC)
+  {
+    DC_UnlockDc(dc);
+    /* Yes, Windows really returns TRUE in this case */
+    return TRUE;
+  }
+
+  if (arctype == GdiTypeArcTo)
+  {
+    // Line from current position to starting point of arc
+    if ( !IntGdiLineTo(dc, XStartArc, YStartArc) )
+    {
+      DC_UnlockDc(dc);
+      return FALSE;
+    }
+  }
+
+  Ret = IntGdiArcInternal(
+                  arctype,
+                  dc,
+                  LeftRect,
+                  TopRect,
+                  RightRect,
+                  BottomRect,
+                  XStartArc,
+                  YStartArc,
+                  XEndArc,
+                  YEndArc);
+
+  if (arctype == GdiTypeArcTo)
+  {
+    // If no error occured, the current position is moved to the ending point of the arc.
+    if(Ret)
+      IntGdiMoveToEx(dc, XEndArc, YEndArc, NULL);
+  }
+
+  DC_UnlockDc( dc );
+  return Ret;
+}
+