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/. */
7 #include "nsViewportInfo.h"
8 #include "mozilla/Assertions.h"
11 using namespace mozilla
;
13 void nsViewportInfo::ConstrainViewportValues() {
14 // Non-positive zoom factors can produce NaN or negative viewport sizes,
15 // so we better be sure our constraints will produce positive zoom factors.
16 MOZ_ASSERT(mMinZoom
> CSSToScreenScale(0.0f
), "zoom factor must be positive");
17 MOZ_ASSERT(mMaxZoom
> CSSToScreenScale(0.0f
), "zoom factor must be positive");
19 if (mDefaultZoom
> mMaxZoom
) {
20 mDefaultZoomValid
= false;
21 mDefaultZoom
= mMaxZoom
;
23 if (mDefaultZoom
< mMinZoom
) {
24 mDefaultZoomValid
= false;
25 mDefaultZoom
= mMinZoom
;
29 static const float& MinOrMax(const float& aA
, const float& aB
,
30 const float& (*aMinOrMax
)(const float&,
32 MOZ_ASSERT(aA
!= nsViewportInfo::kExtendToZoom
&&
33 aA
!= nsViewportInfo::kDeviceSize
&&
34 aB
!= nsViewportInfo::kExtendToZoom
&&
35 aB
!= nsViewportInfo::kDeviceSize
);
36 if (aA
== nsViewportInfo::kAuto
) {
39 if (aB
== nsViewportInfo::kAuto
) {
42 return aMinOrMax(aA
, aB
);
46 const float& nsViewportInfo::Min(const float& aA
, const float& aB
) {
47 return MinOrMax(aA
, aB
, std::min
);
51 const float& nsViewportInfo::Max(const float& aA
, const float& aB
) {
52 return MinOrMax(aA
, aB
, std::max
);