gfx/src/nsSize.h

   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() {}
  23   constexpr nsSize(nscoord aWidth, nscoord aHeight) : Super(aWidth, aHeight) {}
  24
  25   inline mozilla::gfx::IntSize ScaleToNearestPixels(
  26       float aXScale, float aYScale, nscoord aAppUnitsPerPixel) const;
  27   inline mozilla::gfx::IntSize ToNearestPixels(nscoord aAppUnitsPerPixel) const;
  28
  29   /**
  30    * Return this size scaled to a different appunits per pixel (APP) ratio.
  31    * @param aFromAPP the APP to scale from
  32    * @param aToAPP the APP to scale to
  33    */
  34   [[nodiscard]] inline nsSize ScaleToOtherAppUnits(int32_t aFromAPP,
  35                                                    int32_t aToAPP) const;
  36 };
  37
  38 inline mozilla::gfx::IntSize nsSize::ScaleToNearestPixels(
  39     float aXScale, float aYScale, nscoord aAppUnitsPerPixel) const {
  40   return mozilla::gfx::IntSize(
  41       NSToIntRoundUp(NSAppUnitsToDoublePixels(width, aAppUnitsPerPixel) *
  42                      aXScale),
  43       NSToIntRoundUp(NSAppUnitsToDoublePixels(height, aAppUnitsPerPixel) *
  44                      aYScale));
  45 }
  46
  47 inline mozilla::gfx::IntSize nsSize::ToNearestPixels(
  48     nscoord aAppUnitsPerPixel) const {
  49   return ScaleToNearestPixels(1.0f, 1.0f, aAppUnitsPerPixel);
  50 }
  51
  52 inline nsSize nsSize::ScaleToOtherAppUnits(int32_t aFromAPP,
  53                                            int32_t aToAPP) const {
  54   if (aFromAPP != aToAPP) {
  55     nsSize size;
  56     size.width = NSToCoordRound(NSCoordScale(width, aFromAPP, aToAPP));
  57     size.height = NSToCoordRound(NSCoordScale(height, aFromAPP, aToAPP));
  58     return size;
  59   }
  60   return *this;
  61 }
  62
  63 inline nsSize IntSizeToAppUnits(mozilla::gfx::IntSize aSize,
  64                                 nscoord aAppUnitsPerPixel) {
  65   return nsSize(NSIntPixelsToAppUnits(aSize.width, aAppUnitsPerPixel),
  66                 NSIntPixelsToAppUnits(aSize.height, aAppUnitsPerPixel));
  67 }
  68
  69 #endif /* NSSIZE_H */