Move skia extensions from the port to skia/ext for Windows only. Fixed the

include guards of the moved files, but nothing else.

Review URL: http://codereview.chromium.org/11568

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@5861 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 229 insertions, 0 deletions

diff --git a/skia/ext/platform_device_win.cc b/skia/ext/platform_device_win.cc
new file mode 100644
index 0000000..15201c0
--- /dev/null
+++ b/skia/ext/platform_device_win.cc
@@ -0,0 +1,229 @@
+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "skia/ext/platform_device_win.h"
+
+#include "base/logging.h"
+#include "base/gfx/skia_utils.h"
+#include "SkMatrix.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkUtils.h"
+
+namespace gfx {
+
+PlatformDeviceWin::PlatformDeviceWin(const SkBitmap& bitmap)
+    : SkDevice(bitmap) {
+}
+
+// static
+void PlatformDeviceWin::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);
+  DCHECK_NE(res, 0);
+
+  // Enables dithering.
+  res = SetStretchBltMode(context, HALFTONE);
+  DCHECK_NE(res, 0);
+  // As per SetStretchBltMode() documentation, SetBrushOrgEx() must be called
+  // right after.
+  res = SetBrushOrgEx(context, 0, 0, NULL);
+  DCHECK_NE(res, 0);
+
+  // Sets up default orientation.
+  res = SetArcDirection(context, AD_CLOCKWISE);
+  DCHECK_NE(res, 0);
+
+  // Sets up default colors.
+  res = SetBkColor(context, RGB(255, 255, 255));
+  DCHECK_NE(res, CLR_INVALID);
+  res = SetTextColor(context, RGB(0, 0, 0));
+  DCHECK_NE(res, CLR_INVALID);
+  res = SetDCBrushColor(context, RGB(255, 255, 255));
+  DCHECK_NE(res, CLR_INVALID);
+  res = SetDCPenColor(context, RGB(0, 0, 0));
+  DCHECK_NE(res, CLR_INVALID);
+
+  // Sets up default transparency.
+  res = SetBkMode(context, OPAQUE);
+  DCHECK_NE(res, 0);
+  res = SetROP2(context, R2_COPYPEN);
+  DCHECK_NE(res, 0);
+}
+
+// static
+void PlatformDeviceWin::LoadPathToDC(HDC context, const SkPath& path) {
+  switch (path.getFillType()) {
+    case SkPath::kWinding_FillType: {
+      int res = SetPolyFillMode(context, WINDING);
+      DCHECK(res != 0);
+      break;
+    }
+    case SkPath::kEvenOdd_FillType: {
+      int res = SetPolyFillMode(context, ALTERNATE);
+      DCHECK(res != 0);
+      break;
+    }
+    default: {
+      NOTREACHED();
+      break;
+    }
+  }
+  BOOL res = BeginPath(context);
+  DCHECK(res != 0);
+
+  CubicPaths paths;
+  if (!SkPathToCubicPaths(&paths, path))
+    return;
+
+  std::vector<POINT> points;
+  for (CubicPaths::const_iterator path(paths.begin()); path != paths.end();
+       ++path) {
+    if (!path->size())
+      continue;
+    // DCHECK_EQ(points.size() % 4, 0);
+    points.resize(0);
+    points.reserve(path->size() * 3 / 4 + 1);
+    points.push_back(SkPointToPOINT(path->front().p[0]));
+    for (CubicPath::const_iterator point(path->begin()); point != path->end();
+       ++point) {
+      // Never add point->p[0]
+      points.push_back(SkPointToPOINT(point->p[1]));
+      points.push_back(SkPointToPOINT(point->p[2]));
+      points.push_back(SkPointToPOINT(point->p[3]));
+    }
+    DCHECK_EQ((points.size() - 1) % 3, 0);
+    // This is slightly inefficient since all straight line and quadratic lines
+    // are "upgraded" to a cubic line.
+    // TODO(maruel):  http://b/1147346 We should use
+    // PolyDraw/PolyBezier/Polyline whenever possible.
+    res = PolyBezier(context, &points.front(),
+                     static_cast<DWORD>(points.size()));
+    DCHECK_NE(res, 0);
+    if (res == 0)
+      break;
+  }
+  if (res == 0) {
+    // Make sure the path is discarded.
+    AbortPath(context);
+  } else {
+    res = EndPath(context);
+    DCHECK(res != 0);
+  }
+}
+
+// static
+void PlatformDeviceWin::LoadTransformToDC(HDC dc, const SkMatrix& matrix) {
+  XFORM xf;
+  xf.eM11 = matrix[SkMatrix::kMScaleX];
+  xf.eM21 = matrix[SkMatrix::kMSkewX];
+  xf.eDx = matrix[SkMatrix::kMTransX];
+  xf.eM12 = matrix[SkMatrix::kMSkewY];
+  xf.eM22 = matrix[SkMatrix::kMScaleY];
+  xf.eDy = matrix[SkMatrix::kMTransY];
+  SetWorldTransform(dc, &xf);
+}
+
+// static
+bool PlatformDeviceWin::SkPathToCubicPaths(CubicPaths* paths,
+                                           const SkPath& skpath) {
+  paths->clear();
+  CubicPath* current_path = NULL;
+  SkPoint current_points[4];
+  CubicPoints points_to_add;
+  SkPath::Iter iter(skpath, false);
+  for (SkPath::Verb verb = iter.next(current_points);
+       verb != SkPath::kDone_Verb;
+       verb = iter.next(current_points)) {
+    switch (verb) {
+      case SkPath::kMove_Verb: {  // iter.next returns 1 point
+        // Ignores it since the point is copied in the next operation. See
+        // SkPath::Iter::next() for reference.
+        paths->push_back(CubicPath());
+        current_path = &paths->back();
+        // Skip point addition.
+        continue;
+      }
+      case SkPath::kLine_Verb: {  // iter.next returns 2 points
+        points_to_add.p[0] = current_points[0];
+        points_to_add.p[1] = current_points[0];
+        points_to_add.p[2] = current_points[1];
+        points_to_add.p[3] = current_points[1];
+        break;
+      }
+      case SkPath::kQuad_Verb: {  // iter.next returns 3 points
+        points_to_add.p[0] = current_points[0];
+        points_to_add.p[1] = current_points[1];
+        points_to_add.p[2] = current_points[2];
+        points_to_add.p[3] = current_points[2];
+        break;
+      }
+      case SkPath::kCubic_Verb: {  // iter.next returns 4 points
+        points_to_add.p[0] = current_points[0];
+        points_to_add.p[1] = current_points[1];
+        points_to_add.p[2] = current_points[2];
+        points_to_add.p[3] = current_points[3];
+        break;
+      }
+      case SkPath::kClose_Verb: {  // iter.next returns 1 point (the last point)
+        paths->push_back(CubicPath());
+        current_path = &paths->back();
+        continue;
+      }
+      case SkPath::kDone_Verb:  // iter.next returns 0 points
+      default: {
+        current_path = NULL;
+        // Will return false.
+        break;
+      }
+    }
+    DCHECK(current_path);
+    if (!current_path) {
+      paths->clear();
+      return false;
+    }
+    current_path->push_back(points_to_add);
+  }
+  return true;
+}
+
+// static
+void PlatformDeviceWin::LoadClippingRegionToDC(HDC context,
+                                               const SkRegion& region,
+                                               const SkMatrix& transformation) {
+  HRGN hrgn;
+  if (region.isEmpty()) {
+    // region can be empty, in which case everything will be clipped.
+    hrgn = CreateRectRgn(0, 0, 0, 0);
+  } else if (region.isRect()) {
+    // Do the transformation.
+    SkRect rect;
+    rect.set(region.getBounds());
+    transformation.mapRect(&rect);
+    SkIRect irect;
+    rect.round(&irect);
+    hrgn = CreateRectRgnIndirect(&SkIRectToRECT(irect));
+  } else {
+    // It is complex.
+    SkPath path;
+    region.getBoundaryPath(&path);
+    // Clip. Note that windows clipping regions are not affected by the
+    // transform so apply it manually.
+    path.transform(transformation);
+    LoadPathToDC(context, path);
+    hrgn = PathToRegion(context);
+  }
+  int result = SelectClipRgn(context, hrgn);
+  DCHECK_NE(result, ERROR);
+  result = DeleteObject(hrgn);
+  DCHECK_NE(result, 0);
+}
+
+}  // namespace gfx
+