tor-browser

The Tor Browser
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Resolution.h (1958B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #ifndef mozilla_image_Resolution_h
      7 #define mozilla_image_Resolution_h
      8 
      9 #include "mozilla/Assertions.h"
     10 #include <cmath>
     11 
     12 namespace mozilla {
     13 namespace image {
     14 
     15 /**
     16 * The resolution of an image, in dppx.
     17 */
     18 struct Resolution {
     19  Resolution() = default;
     20  Resolution(float aX, float aY) : mX(aX), mY(aY) {
     21    MOZ_ASSERT(mX != 0.0f);
     22    MOZ_ASSERT(mY != 0.0f);
     23  }
     24 
     25  bool operator==(const Resolution& aOther) const {
     26    return mX == aOther.mX && mY == aOther.mY;
     27  }
     28  bool operator!=(const Resolution& aOther) const { return !(*this == aOther); }
     29 
     30  float mX = 1.0f;
     31  float mY = 1.0f;
     32 
     33  void ScaleBy(float aScale) {
     34    if (MOZ_LIKELY(aScale != 0.0f)) {
     35      mX *= aScale;
     36      mY *= aScale;
     37    }
     38  }
     39 
     40  void ApplyXTo(int32_t& aWidth) const {
     41    if (mX != 1.0f) {
     42      aWidth = std::round(float(aWidth) / mX);
     43    }
     44  }
     45 
     46  void ApplyXTo(float& aWidth) const {
     47    if (mX != 1.0f) {
     48      aWidth /= mX;
     49    }
     50  }
     51 
     52  void ApplyYTo(int32_t& aHeight) const {
     53    if (mY != 1.0f) {
     54      aHeight = std::round(float(aHeight) / mY);
     55    }
     56  }
     57 
     58  void ApplyYTo(float& aHeight) const {
     59    if (mY != 1.0f) {
     60      aHeight /= mY;
     61    }
     62  }
     63 
     64  void ApplyTo(int32_t& aWidth, int32_t& aHeight) const {
     65    ApplyXTo(aWidth);
     66    ApplyYTo(aHeight);
     67  }
     68 
     69  void ApplyTo(float& aWidth, float& aHeight) const {
     70    ApplyXTo(aWidth);
     71    ApplyYTo(aHeight);
     72  }
     73 
     74  void ApplyInverseTo(int32_t& aWidth, int32_t& aHeight) {
     75    if (mX != 1.0f) {
     76      aWidth = std::round(float(aWidth) * mX);
     77    }
     78    if (mY != 1.0f) {
     79      aHeight = std::round(float(aHeight) * mY);
     80    }
     81  }
     82 };
     83 
     84 }  // namespace image
     85 
     86 using ImageResolution = image::Resolution;
     87 
     88 }  // namespace mozilla
     89 
     90 #endif