| /* |
| * Copyright (C) 2000 Lars Knoll (knoll@kde.org) |
| * (C) 2000 Antti Koivisto (koivisto@kde.org) |
| * (C) 2000 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All |
| * rights reserved. |
| * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_ADJUST_FOR_ABSOLUTE_ZOOM_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_ADJUST_FOR_ABSOLUTE_ZOOM_H_ |
| |
| #include "third_party/blink/renderer/core/layout/layout_object.h" |
| #include "third_party/blink/renderer/core/style/computed_style.h" |
| #include "third_party/blink/renderer/platform/geometry/layout_unit.h" |
| |
| namespace blink { |
| |
| class AdjustForAbsoluteZoom { |
| STATIC_ONLY(AdjustForAbsoluteZoom); |
| |
| public: |
| // FIXME: Reduce/remove the dependency on zoom adjusted int values. |
| // The float or LayoutUnit versions of layout values should be used. |
| static int AdjustInt(int value, float zoom_factor) { |
| if (zoom_factor == 1) |
| return value; |
| // Needed because computeLengthInt truncates (rather than rounds) when |
| // scaling up. |
| float fvalue = value; |
| if (zoom_factor > 1) { |
| if (value < 0) |
| fvalue -= 0.5f; |
| else |
| fvalue += 0.5f; |
| } |
| return RoundForImpreciseConversion<int>(fvalue / zoom_factor); |
| } |
| inline static int AdjustInt(int value, const ComputedStyle& style) { |
| float zoom_factor = style.EffectiveZoom(); |
| if (zoom_factor == 1) |
| return value; |
| return AdjustInt(value, zoom_factor); |
| } |
| inline static int AdjustInt(int value, LayoutObject* layout_object) { |
| DCHECK(layout_object); |
| return AdjustInt(value, layout_object->StyleRef()); |
| } |
| |
| inline static float AdjustFloat(float value, const ComputedStyle& style) { |
| return value / style.EffectiveZoom(); |
| } |
| |
| inline static double AdjustDouble(double value, const ComputedStyle& style) { |
| return value / style.EffectiveZoom(); |
| } |
| |
| inline static LayoutUnit AdjustLayoutUnit(LayoutUnit value, |
| const ComputedStyle& style) { |
| return LayoutUnit(value / style.EffectiveZoom()); |
| } |
| inline static LayoutUnit AdjustLayoutUnit(LayoutUnit value, |
| LayoutObject& layout_object) { |
| return AdjustLayoutUnit(value, layout_object.StyleRef()); |
| } |
| |
| inline static void AdjustFloatQuad(FloatQuad& quad, |
| const LayoutObject& layout_object) { |
| float zoom = layout_object.StyleRef().EffectiveZoom(); |
| if (zoom != 1) |
| quad.Scale(1 / zoom, 1 / zoom); |
| } |
| inline static void AdjustFloatRect(FloatRect& rect, |
| const LayoutObject& layout_object) { |
| float zoom = layout_object.StyleRef().EffectiveZoom(); |
| if (zoom != 1) |
| rect.Scale(1 / zoom, 1 / zoom); |
| } |
| |
| inline static float AdjustScroll(float scroll_offset, float zoom_factor) { |
| return scroll_offset / zoom_factor; |
| } |
| inline static float AdjustScroll(float scroll_offset, |
| const ComputedStyle& style) { |
| return AdjustScroll(scroll_offset, style.EffectiveZoom()); |
| } |
| inline static double AdjustScroll(double value, LayoutObject& layout_object) { |
| return AdjustScroll(value, layout_object.StyleRef()); |
| } |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_ADJUST_FOR_ABSOLUTE_ZOOM_H_ |