import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

image/ImageRegion.h

@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_image_ImageRegion_h
+#define mozilla_image_ImageRegion_h
+
+#include "gfxRect.h"
+#include "mozilla/gfx/Types.h"
+
+namespace mozilla {
+namespace image {
+
+/**
+ * An axis-aligned rectangle in tiled image space, with an optional sampling
+ * restriction rect. The drawing code ensures that if a sampling restriction
+ * rect is present, any pixels sampled during the drawing process are found
+ * within that rect.
+ *
+ * The sampling restriction rect exists primarily for callers which perform
+ * pixel snapping. Other callers should generally use one of the Create()
+ * overloads.
+ */
+class ImageRegion
+{
+  typedef mozilla::gfx::ExtendMode ExtendMode;
+
+public:
+  static ImageRegion Empty()
+  {
+    return ImageRegion(gfxRect(), ExtendMode::CLAMP);
+  }
+
+  static ImageRegion Create(const gfxRect& aRect,
+                            ExtendMode aExtendMode = ExtendMode::CLAMP)
+  {
+    return ImageRegion(aRect, aExtendMode);
+  }
+
+  static ImageRegion Create(const gfxSize& aSize,
+                            ExtendMode aExtendMode = ExtendMode::CLAMP)
+  {
+    return ImageRegion(gfxRect(0, 0, aSize.width, aSize.height), aExtendMode);
+  }
+
+  static ImageRegion Create(const nsIntSize& aSize,
+                            ExtendMode aExtendMode = ExtendMode::CLAMP)
+  {
+    return ImageRegion(gfxRect(0, 0, aSize.width, aSize.height), aExtendMode);
+  }
+
+  static ImageRegion CreateWithSamplingRestriction(const gfxRect& aRect,
+                                                   const gfxRect& aRestriction,
+                                                   ExtendMode aExtendMode = ExtendMode::CLAMP)
+  {
+    return ImageRegion(aRect, aRestriction, aExtendMode);
+  }
+
+  bool IsRestricted() const { return mIsRestricted; }
+  const gfxRect& Rect() const { return mRect; }
+
+  const gfxRect& Restriction() const
+  {
+    MOZ_ASSERT(mIsRestricted);
+    return mRestriction;
+  }
+
+  bool RestrictionContains(const gfxRect& aRect) const
+  {
+    if (!mIsRestricted) {
+      return true;
+    }
+    return mRestriction.Contains(aRect);
+  }
+
+  ImageRegion Intersect(const gfxRect& aRect) const
+  {
+    if (mIsRestricted) {
+      return CreateWithSamplingRestriction(aRect.Intersect(mRect),
+                                           aRect.Intersect(mRestriction));
+    }
+    return Create(aRect.Intersect(mRect));
+  }
+
+  gfxRect IntersectAndRestrict(const gfxRect& aRect) const
+  {
+    gfxRect intersection = mRect.Intersect(aRect);
+    if (mIsRestricted) {
+      intersection = mRestriction.Intersect(intersection);
+    }
+    return intersection;
+  }
+
+  void MoveBy(gfxFloat dx, gfxFloat dy)
+  {
+    mRect.MoveBy(dx, dy);
+    if (mIsRestricted) {
+      mRestriction.MoveBy(dx, dy);
+    }
+  }
+
+  void Scale(gfxFloat sx, gfxFloat sy)
+  {
+    mRect.Scale(sx, sy);
+    if (mIsRestricted) {
+      mRestriction.Scale(sx, sy);
+    }
+  }
+
+  void TransformBy(const gfxMatrix& aMatrix)
+  {
+    mRect = aMatrix.Transform(mRect);
+    if (mIsRestricted) {
+      mRestriction = aMatrix.Transform(mRestriction);
+    }
+  }
+
+  void TransformBoundsBy(const gfxMatrix& aMatrix)
+  {
+    mRect = aMatrix.TransformBounds(mRect);
+    if (mIsRestricted) {
+      mRestriction = aMatrix.TransformBounds(mRestriction);
+    }
+  }
+
+  ImageRegion operator-(const gfxPoint& aPt) const
+  {
+    if (mIsRestricted) {
+      return CreateWithSamplingRestriction(mRect - aPt, mRestriction - aPt);
+    }
+    return Create(mRect - aPt);
+  }
+
+  ImageRegion operator+(const gfxPoint& aPt) const
+  {
+    if (mIsRestricted) {
+      return CreateWithSamplingRestriction(mRect + aPt, mRestriction + aPt);
+    }
+    return Create(mRect + aPt);
+  }
+
+  gfx::ExtendMode GetExtendMode() const
+  {
+    return mExtendMode;
+  }
+
+  /* ImageRegion() : mIsRestricted(false) { } */
+
+private:
+  explicit ImageRegion(const gfxRect& aRect, ExtendMode aExtendMode)
+    : mRect(aRect)
+    , mExtendMode(aExtendMode)
+    , mIsRestricted(false)
+  { }
+
+  ImageRegion(const gfxRect& aRect, const gfxRect& aRestriction, ExtendMode aExtendMode)
+    : mRect(aRect)
+    , mRestriction(aRestriction)
+    , mExtendMode(aExtendMode)
+    , mIsRestricted(true)
+  { }
+
+  gfxRect mRect;
+  gfxRect mRestriction;
+  ExtendMode mExtendMode;
+  bool    mIsRestricted;
+};
+
+} // namespace image
+} // namespace mozilla
+
+#endif // mozilla_image_ImageRegion_h