From 521b9caad999d5777ae20aa0c4c7b2fcb4a3f49f Mon Sep 17 00:00:00 2001
From: Filip Navara <filip.navara@gmail.com>
Date: Wed, 21 Jun 2006 08:33:27 +0000
Subject: [PATCH] Implement the isometric mapping mode and call the mapping
 functions for Ellipse and Polygon drawing. Thanks MgW from IRC for testing.
 :)

svn path=/trunk/; revision=22448
---
 .../subsystems/win32/win32k/objects/coord.c   | 77 ++++++++++++++++++-
 .../win32/win32k/objects/fillshap.c           | 23 +++---
 2 files changed, 89 insertions(+), 11 deletions(-)

diff --git a/reactos/subsystems/win32/win32k/objects/coord.c b/reactos/subsystems/win32/win32k/objects/coord.c
index 9097fa196fc..d6a8b888aaa 100644
--- a/reactos/subsystems/win32/win32k/objects/coord.c
+++ b/reactos/subsystems/win32/win32k/objects/coord.c
@@ -34,6 +34,24 @@
 
 /* FUNCTIONS *****************************************************************/
 
+void FASTCALL
+IntFixIsotropicMapping(PDC dc)
+{
+  ULONG xdim = EngMulDiv(dc->vportExtX, dc->GDIInfo->ulHorzSize, dc->GDIInfo->ulHorzRes) / dc->wndExtX;
+  ULONG ydim = EngMulDiv(dc->vportExtY, dc->GDIInfo->ulVertSize, dc->GDIInfo->ulVertRes) / dc->wndExtY;
+
+  if (xdim > ydim)
+  {
+    dc->vportExtX = dc->vportExtX * abs(ydim / xdim);
+    if (!dc->vportExtX) dc->vportExtX = 1;
+  }
+  else
+  {
+    dc->vportExtY = dc->vportExtY * abs(xdim / ydim);
+    if (!dc->vportExtY) dc->vportExtY = 1;
+  }
+}
+
 BOOL FASTCALL
 IntGdiCombineTransform(LPXFORM XFormResult,
                        LPXFORM xform1,
@@ -668,7 +686,62 @@ NtGdiSetMapMode(HDC  hDC,
   }
 
   PrevMapMode = dc->w.MapMode;
-  dc->w.MapMode = MapMode;
+
+  if (MapMode != dc->w.MapMode || (MapMode != MM_ISOTROPIC && MapMode != MM_ANISOTROPIC))
+  {
+    dc->w.MapMode = MapMode;
+
+    switch (MapMode)
+    {
+      case MM_TEXT:
+        dc->wndExtX = 1;
+        dc->wndExtY = 1;
+        dc->vportExtX = 1;
+        dc->vportExtY = 1;
+        break;
+
+      case MM_LOMETRIC:
+      case MM_ISOTROPIC:
+        dc->wndExtX = dc->GDIInfo->ulHorzSize * 10;
+        dc->wndExtY = dc->GDIInfo->ulVertSize * 10;
+        dc->vportExtX = dc->GDIInfo->ulHorzRes;
+        dc->vportExtY = -dc->GDIInfo->ulVertRes;
+        break;
+
+      case MM_HIMETRIC:
+        dc->wndExtX = dc->GDIInfo->ulHorzSize * 100;
+        dc->wndExtY = dc->GDIInfo->ulVertSize * 100;
+        dc->vportExtX = dc->GDIInfo->ulHorzRes;
+        dc->vportExtY = -dc->GDIInfo->ulVertRes;
+        break;
+
+      case MM_LOENGLISH:
+        dc->wndExtX = EngMulDiv(1000, dc->GDIInfo->ulHorzSize, 254);
+        dc->wndExtY = EngMulDiv(1000, dc->GDIInfo->ulVertSize, 254);
+        dc->vportExtX = dc->GDIInfo->ulHorzRes;
+        dc->vportExtY = -dc->GDIInfo->ulVertRes;
+        break;
+
+      case MM_HIENGLISH:
+        dc->wndExtX = EngMulDiv(10000, dc->GDIInfo->ulHorzSize, 254);
+        dc->wndExtY = EngMulDiv(10000, dc->GDIInfo->ulVertSize, 254);
+        dc->vportExtX = dc->GDIInfo->ulHorzRes;
+        dc->vportExtY = -dc->GDIInfo->ulVertRes;
+        break;
+
+      case MM_TWIPS:
+        dc->wndExtX = EngMulDiv(14400, dc->GDIInfo->ulHorzSize, 254);
+        dc->wndExtY = EngMulDiv(14400, dc->GDIInfo->ulVertSize, 254);
+        dc->vportExtX = dc->GDIInfo->ulHorzRes;
+        dc->vportExtY = -dc->GDIInfo->ulVertRes;
+        break;
+
+      case MM_ANISOTROPIC:
+        break;
+    }
+
+    DC_UpdateXforms(dc);
+  }
 
   DC_UnlockDc(dc);
 
@@ -737,6 +810,8 @@ NtGdiSetViewportExtEx(HDC  hDC,
   dc->vportExtX = XExtent;
   dc->vportExtY = YExtent;
 
+  if (dc->w.MapMode == MM_ISOTROPIC)
+    IntFixIsotropicMapping(dc);
   DC_UpdateXforms(dc);
   DC_UnlockDc(dc);
 
diff --git a/reactos/subsystems/win32/win32k/objects/fillshap.c b/reactos/subsystems/win32/win32k/objects/fillshap.c
index f98d1005500..a8964bb668a 100644
--- a/reactos/subsystems/win32/win32k/objects/fillshap.c
+++ b/reactos/subsystems/win32/win32k/objects/fillshap.c
@@ -66,6 +66,7 @@ IntGdiPolygon(PDC    dc,
   ASSERT(BitmapObj);
 
       /* Convert to screen coordinates */
+      IntLPtoDP(dc, UnsafePoints, Count);
       for (CurrentPoint = 0; CurrentPoint < Count; CurrentPoint++)
 	{
 	  UnsafePoints[CurrentPoint].x += dc->w.DCOrgX;
@@ -258,21 +259,23 @@ NtGdiEllipse(
    IntGdiInitBrushInstance(&FillBrushInst, FillBrush, dc->XlateBrush);
    IntGdiInitBrushInstance(&PenBrushInst, PenBrush, dc->XlatePen);
 
-   nLeftRect += dc->w.DCOrgX;
-   nRightRect += dc->w.DCOrgX - 1;
-   nTopRect += dc->w.DCOrgY;
-   nBottomRect += dc->w.DCOrgY - 1;
-
-   RadiusX = max((nRightRect - nLeftRect) >> 1, 1);
-   RadiusY = max((nBottomRect - nTopRect) >> 1, 1);
-   CenterX = nLeftRect + RadiusX;
-   CenterY = nTopRect + RadiusY;
-
    RectBounds.left = nLeftRect;
    RectBounds.right = nRightRect;
    RectBounds.top = nTopRect;
    RectBounds.bottom = nBottomRect;
 
+   IntLPtoDP(dc, (LPPOINT)&RectBounds, 2);
+
+   RectBounds.left += dc->w.DCOrgX;
+   RectBounds.right += dc->w.DCOrgX;
+   RectBounds.top += dc->w.DCOrgY;
+   RectBounds.bottom += dc->w.DCOrgY;
+
+   RadiusX = max((RectBounds.right - RectBounds.left) >> 1, 1);
+   RadiusY = max((RectBounds.bottom - RectBounds.top) >> 1, 1);
+   CenterX = RectBounds.left + RadiusX;
+   CenterY = RectBounds.top + RadiusY;
+
    if (RadiusX > RadiusY)
    {
       nx = RadiusX;