gfx/src/nsSize.h

   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 NSSIZE_H
   7 #define NSSIZE_H
   8
   9 #include "nsCoord.h"
  10 #include "mozilla/gfx/BaseSize.h"
  11 #include "mozilla/gfx/Point.h"
  12
  13 // Maximum allowable size
  14 #define NS_MAXSIZE nscoord_MAX
  15
  16 struct nsIntSize;
  17 typedef nsIntSize gfxIntSize;
  18
  19 struct nsSize : public mozilla::gfx::BaseSize<nscoord, nsSize> {
  20   typedef mozilla::gfx::BaseSize<nscoord, nsSize> Super;
  21
  22   nsSize() : Super() {}
  23   nsSize(nscoord aWidth, nscoord aHeight) : Super(aWidth, aHeight) {}
  24
  25   inline nsIntSize ScaleToNearestPixels(float aXScale, float aYScale,
  26                                         nscoord aAppUnitsPerPixel) const;
  27   inline nsIntSize ToNearestPixels(nscoord aAppUnitsPerPixel) const;
  28
  29   // Converts this size from aFromAPP, an appunits per pixel ratio, to aToAPP.
  30   inline nsSize ConvertAppUnits(int32_t aFromAPP, int32_t aToAPP) const;
  31 };
  32
  33 struct nsIntSize : public mozilla::gfx::BaseSize<int32_t, nsIntSize> {
  34   typedef mozilla::gfx::BaseSize<int32_t, nsIntSize> Super;
  35
  36   nsIntSize() : Super() {}
  37   nsIntSize(int32_t aWidth, int32_t aHeight) : Super(aWidth, aHeight) {}
  38
  39   inline nsSize ToAppUnits(nscoord aAppUnitsPerPixel) const;
  40   mozilla::gfx::IntSize ToIntSize() const
  41   {
  42     return mozilla::gfx::IntSize(width, height);
  43   };
  44 };
  45
  46 inline nsIntSize
  47 nsSize::ScaleToNearestPixels(float aXScale, float aYScale,
  48                              nscoord aAppUnitsPerPixel) const
  49 {
  50   return nsIntSize(
  51       NSToIntRoundUp(NSAppUnitsToDoublePixels(width, aAppUnitsPerPixel) * aXScale),
  52       NSToIntRoundUp(NSAppUnitsToDoublePixels(height, aAppUnitsPerPixel) * aYScale));
  53 }
  54
  55 inline nsIntSize
  56 nsSize::ToNearestPixels(nscoord aAppUnitsPerPixel) const
  57 {
  58   return ScaleToNearestPixels(1.0f, 1.0f, aAppUnitsPerPixel);
  59 }
  60
  61 inline nsSize
  62 nsSize::ConvertAppUnits(int32_t aFromAPP, int32_t aToAPP) const {
  63   if (aFromAPP != aToAPP) {
  64     nsSize size;
  65     size.width = NSToCoordRound(NSCoordScale(width, aFromAPP, aToAPP));
  66     size.height = NSToCoordRound(NSCoordScale(height, aFromAPP, aToAPP));
  67     return size;
  68   }
  69   return *this;
  70 }
  71
  72 inline nsSize
  73 nsIntSize::ToAppUnits(nscoord aAppUnitsPerPixel) const
  74 {
  75   return nsSize(NSIntPixelsToAppUnits(width, aAppUnitsPerPixel),
  76                 NSIntPixelsToAppUnits(height, aAppUnitsPerPixel));
  77 }
  78
  79 #endif /* NSSIZE_H */