Upstream iOS UI utilities.

ios/chrome/browser/ui/ui_util.h

Index: ios/chrome/browser/ui/ui_util.h
diff --git a/ios/chrome/browser/ui/ui_util.h b/ios/chrome/browser/ui/ui_util.h
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+// Copyright 2012 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.
+
+#ifndef IOS_CHROME_BROWSER_UI_UI_UTIL_H_
+#define IOS_CHROME_BROWSER_UI_UI_UTIL_H_
+
+#include <CoreGraphics/CoreGraphics.h>
+
+// UI Util containing functions that do not require Objective-C.
+
+// Running on an iPad?
+bool IsIPadIdiom();
+
+// Is the screen of the device a high resolution screen, i.e. Retina Display.
+bool IsHighResScreen();
+
+// Returns true if the device is in portrait orientation or if interface
+// orientation is unknown.
+bool IsPortrait();
+
+// Returns true if the device is in landscape orientation.
+bool IsLandscape();
+
+// Returns the height of the screen in the current orientation.
+CGFloat CurrentScreenHeight();
+
+// Returns the width of the screen in the current orientation.
+CGFloat CurrentScreenWidth();
+
+// Returns the height of the status bar, accounting for orientation.
+CGFloat StatusBarHeight();
+
+// Returns the closest pixel-aligned value less than |value|, taking the scale
+// factor into account. At a scale of 1, equivalent to floor().
+CGFloat AlignValueToPixel(CGFloat value);
+
+// Returns the point resulting from applying AlignValueToPixel() to both
+// components.
+CGPoint AlignPointToPixel(CGPoint point);
+
+// Returns the rectangle resulting from applying AlignPointToPixel() to the
+// origin.
+CGRect AlignRectToPixel(CGRect rect);
+
+// Returns the rectangle resulting from applying AlignPointToPixel() to the
+// origin, and ui::AlignSizeToUpperPixel() to the size.
+CGRect AlignRectOriginAndSizeToPixels(CGRect rect);
+
+// Makes a copy of |rect| with a new origin specified by |x| and |y|.
+CGRect CGRectCopyWithOrigin(CGRect rect, CGFloat x, CGFloat y);
+
+// Returns a square CGRect centered at |x|, |y| with a width of |width|.
+// Both the position and the size of the CGRect will be aligned to points.
+CGRect CGRectMakeAlignedAndCenteredAt(CGFloat x, CGFloat y, CGFloat width);
+
+// This function is used to figure out how to resize an image from an
+// |originalSize| to a |targetSize|. It returns the final size of the resized
+// image and |projectTo| that is used to select which part of the original image
+// to scale into the destination.
+//
+// If |preserveAspectRatio| is YES, the original image aspect ratio is
+// preserved.
+//
+// When |preserveAspectRatio| is YES and if |targetSize|'s aspect ratio
+// is different from the image, the resulting image will be shrunken to
+// a size that is within |targetSize|.
+//
+// To preserve the |targetSize| when |preserveAspectRatio| is YES, set
+// |trimToFit| to YES. The resulting image will be the largest proportion
+// of the receiver that fits in the targetSize, aligned to center of the image.
+void CalculateProjection(CGSize originalSize,
+                         CGSize targetSize,
+                         bool preserveAspectRatio,
+                         bool trimToFit,
+                         CGSize& revisedTargetSize,
+                         CGRect& projectTo);
+
+#endif  // IOS_CHROME_BROWSER_UI_UI_UTIL_H_