Move Windows DC-initialization to skia_utils_win.h

skia/ext/skia_utils_win.cc

Index: skia/ext/skia_utils_win.cc
diff --git a/skia/ext/skia_utils_win.cc b/skia/ext/skia_utils_win.cc
index 3089b242c2626febb0a485c5dd8ff50c138c558b..9873373725705fe6f8e4491a54ebd56916829276 100644
--- a/skia/ext/skia_utils_win.cc
+++ b/skia/ext/skia_utils_win.cc
@@ -58,5 +58,44 @@ COLORREF SkColorToCOLORREF(SkColor color) {
 #endif
 }
 
+void InitializeDC(HDC context) {
+  // Enables world transformation.
+  // If the GM_ADVANCED graphics mode is set, GDI always draws arcs in the
+  // counterclockwise direction in logical space. This is equivalent to the
+  // statement that, in the GM_ADVANCED graphics mode, both arc control points
+  // and arcs themselves fully respect the device context's world-to-device
+  // transformation.
+  BOOL res = SetGraphicsMode(context, GM_ADVANCED);
+  SkASSERT(res != 0);
+
+  // Enables dithering.
+  res = SetStretchBltMode(context, HALFTONE);
+  SkASSERT(res != 0);
+  // As per SetStretchBltMode() documentation, SetBrushOrgEx() must be called
+  // right after.
+  res = SetBrushOrgEx(context, 0, 0, NULL);
+  SkASSERT(res != 0);
+
+  // Sets up default orientation.
+  res = SetArcDirection(context, AD_CLOCKWISE);
+  SkASSERT(res != 0);
+
+  // Sets up default colors.
+  res = SetBkColor(context, RGB(255, 255, 255));
+  SkASSERT(res != CLR_INVALID);
+  res = SetTextColor(context, RGB(0, 0, 0));
+  SkASSERT(res != CLR_INVALID);
+  res = SetDCBrushColor(context, RGB(255, 255, 255));
+  SkASSERT(res != CLR_INVALID);
+  res = SetDCPenColor(context, RGB(0, 0, 0));
+  SkASSERT(res != CLR_INVALID);
+
+  // Sets up default transparency.
+  res = SetBkMode(context, OPAQUE);
+  SkASSERT(res != 0);
+  res = SetROP2(context, R2_COPYPEN);
+  SkASSERT(res != 0);
+}
+
 }  // namespace skia