tor-browser

The Tor Browser
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nsSize.h (2186B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef NSSIZE_H
      8 #define NSSIZE_H
      9 
     10 #include "nsCoord.h"
     11 #include "mozilla/gfx/BaseSize.h"
     12 #include "mozilla/gfx/Point.h"
     13 
     14 // Maximum allowable size
     15 inline constexpr nscoord NS_MAXSIZE = nscoord_MAX;
     16 
     17 typedef mozilla::gfx::IntSize nsIntSize;
     18 
     19 struct nsSize : public mozilla::gfx::BaseSize<nscoord, nsSize> {
     20  typedef mozilla::gfx::BaseSize<nscoord, nsSize> Super;
     21 
     22  constexpr nsSize() = default;
     23  constexpr nsSize(nscoord aWidth, nscoord aHeight) : Super(aWidth, aHeight) {}
     24 
     25  mozilla::gfx::IntSize ScaleToNearestPixels(float aXScale, float aYScale,
     26                                             nscoord aAppUnitsPerPixel) const {
     27    return {NSToIntRoundUp(NSAppUnitsToDoublePixels(width, aAppUnitsPerPixel) *
     28                           aXScale),
     29            NSToIntRoundUp(NSAppUnitsToDoublePixels(height, aAppUnitsPerPixel) *
     30                           aYScale)};
     31  }
     32 
     33  mozilla::gfx::IntSize ToNearestPixels(nscoord aAppUnitsPerPixel) const {
     34    return ScaleToNearestPixels(1.0f, 1.0f, aAppUnitsPerPixel);
     35  }
     36 
     37  /**
     38   * Return this size scaled to a different appunits per pixel (APP) ratio.
     39   * @param aFromAPP the APP to scale from
     40   * @param aToAPP the APP to scale to
     41   */
     42  [[nodiscard]] nsSize ScaleToOtherAppUnits(int32_t aFromAPP,
     43                                            int32_t aToAPP) const {
     44    if (aFromAPP != aToAPP) {
     45      nsSize size;
     46      size.width = NSToCoordRound(NSCoordScale(width, aFromAPP, aToAPP));
     47      size.height = NSToCoordRound(NSCoordScale(height, aFromAPP, aToAPP));
     48      return size;
     49    }
     50    return *this;
     51  }
     52 };
     53 
     54 inline nsSize IntSizeToAppUnits(mozilla::gfx::IntSize aSize,
     55                                nscoord aAppUnitsPerPixel) {
     56  return nsSize(NSIntPixelsToAppUnits(aSize.width, aAppUnitsPerPixel),
     57                NSIntPixelsToAppUnits(aSize.height, aAppUnitsPerPixel));
     58 }
     59 
     60 #endif /* NSSIZE_H */