Revert "Pull chromium at 2c3ffb2355a27c32f45e508ef861416b820c823b"

skia/ext/platform_device_mac.cc

 // 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.h"
 #include "skia/ext/bitmap_platform_device.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #include "skia/ext/skia_utils_mac.h"
 #include "third_party/skia/include/core/SkMatrix.h"
@@ skipping 12 matching lines @@
 }
 
 CGContextRef PlatformDevice::BeginPlatformPaint() {
   return GetBitmapContext();
 }
 
 void PlatformDevice::EndPlatformPaint() {
   // Flushing will be done in onAccessBitmap.
 }
 
+// Set up the CGContextRef for peaceful coexistence with Skia
+void PlatformDevice::InitializeCGContext(CGContextRef context) {
+  // CG defaults to the same settings as Skia
+}
+
+// static
+void PlatformDevice::LoadPathToCGContext(CGContextRef context,
+                                         const SkPath& path) {
+  // instead of a persistent attribute of the context, CG specifies the fill
+  // type per call, so we just have to load up the geometry.
+  CGContextBeginPath(context);
+
+  SkPoint points[4] = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
+  SkPath::Iter iter(path, false);
+  for (SkPath::Verb verb = iter.next(points); verb != SkPath::kDone_Verb;
+       verb = iter.next(points)) {
+    switch (verb) {
+      case SkPath::kMove_Verb: {  // iter.next returns 1 point
+        CGContextMoveToPoint(context, points[0].fX, points[0].fY);
+        break;
+      }
+      case SkPath::kLine_Verb: {  // iter.next returns 2 points
+        CGContextAddLineToPoint(context, points[1].fX, points[1].fY);
+        break;
+      }
+      case SkPath::kQuad_Verb: {  // iter.next returns 3 points
+        CGContextAddQuadCurveToPoint(context, points[1].fX, points[1].fY,
+                                     points[2].fX, points[2].fY);
+        break;
+      }
+      case SkPath::kCubic_Verb: {  // iter.next returns 4 points
+        CGContextAddCurveToPoint(context, points[1].fX, points[1].fY,
+                                 points[2].fX, points[2].fY,
+                                 points[3].fX, points[3].fY);
+        break;
+      }
+      case SkPath::kClose_Verb: {  // iter.next returns 1 point (the last point)
+        break;
+      }
+      case SkPath::kDone_Verb:  // iter.next returns 0 points
+      default: {
+        SkASSERT(false);
+        break;
+      }
+    }
+  }
+  CGContextClosePath(context);
+}
+
+// static
+void PlatformDevice::LoadTransformToCGContext(CGContextRef context,
+                                              const SkMatrix& matrix) {
+  // CoreGraphics can concatenate transforms, but not reset the current one.
+  // So in order to get the required behavior here, we need to first make
+  // the current transformation matrix identity and only then load the new one.
+
+  // Reset matrix to identity.
+  CGAffineTransform orig_cg_matrix = CGContextGetCTM(context);
+  CGAffineTransform orig_cg_matrix_inv = CGAffineTransformInvert(
+      orig_cg_matrix);
+  CGContextConcatCTM(context, orig_cg_matrix_inv);
+
+  // assert that we have indeed returned to the identity Matrix.
+  SkASSERT(CGAffineTransformIsIdentity(CGContextGetCTM(context)));
+
+  // Convert xform to CG-land.
+  // Our coordinate system is flipped to match WebKit's so we need to modify
+  // the xform to match that.
+  SkMatrix transformed_matrix = matrix;
+  SkScalar sy = matrix.getScaleY() * (SkScalar)-1;
+  transformed_matrix.setScaleY(sy);
+  size_t height = CGBitmapContextGetHeight(context);
+  SkScalar ty = -matrix.getTranslateY(); // y axis is flipped.
+  transformed_matrix.setTranslateY(ty + (SkScalar)height);
+
+  CGAffineTransform cg_matrix = gfx::SkMatrixToCGAffineTransform(
+      transformed_matrix);
+
+  // Load final transform into context.
+  CGContextConcatCTM(context, cg_matrix);
+}
+
+// static
+void PlatformDevice::LoadClippingRegionToCGContext(
+         CGContextRef context,
+         const SkRegion& region,
+         const SkMatrix& transformation) {
+  if (region.isEmpty()) {
+    // region can be empty, in which case everything will be clipped.
+    SkRect rect;
+    rect.setEmpty();
+    CGContextClipToRect(context, gfx::SkRectToCGRect(rect));
+  } else if (region.isRect()) {
+    // CoreGraphics applies the current transform to clip rects, which is
+    // unwanted. Inverse-transform the rect before sending it to CG. This only
+    // works for translations and scaling, but not for rotations (but the
+    // viewport is never rotated anyway).
+    SkMatrix t;
+    bool did_invert = transformation.invert(&t);
+    if (!did_invert)
+      t.reset();
+    // Do the transformation.
+    SkRect rect;
+    rect.set(region.getBounds());
+    t.mapRect(&rect);
+    SkIRect irect;
+    rect.round(&irect);
+    CGContextClipToRect(context, gfx::SkIRectToCGRect(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);
+    // TODO(playmobil): Implement.
+    SkASSERT(false);
+    // LoadPathToDC(context, path);
+    // hrgn = PathToRegion(context);
+  }
+}
+
 }  // namespace skia