third_party/WebKit/Source/core/svg/SVGLengthContext.h

   1 /*
   2  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #ifndef SVGLengthContext_h
  21 #define SVGLengthContext_h
  22
  23 #include "core/svg/SVGUnitTypes.h"
  24 #include "platform/Length.h"
  25 #include "platform/geometry/FloatRect.h"
  26
  27 namespace blink {
  28
  29 class ComputedStyle;
  30 class SVGElement;
  31 class SVGLength;
  32 class UnzoomedLength;
  33
  34 enum SVGLengthType {
  35     LengthTypeUnknown = 0,
  36     LengthTypeNumber,
  37     LengthTypePercentage,
  38     LengthTypeEMS,
  39     LengthTypeEXS,
  40     LengthTypePX,
  41     LengthTypeCM,
  42     LengthTypeMM,
  43     LengthTypeIN,
  44     LengthTypePT,
  45     LengthTypePC,
  46     LengthTypeREMS,
  47     LengthTypeCHS
  48 };
  49
  50 enum class SVGLengthMode {
  51     Width,
  52     Height,
  53     Other
  54 };
  55
  56 class SVGLengthContext {
  57     STACK_ALLOCATED();
  58 public:
  59     explicit SVGLengthContext(const SVGElement*);
  60
  61     template<typename T>
  62     static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
  63     {
  64         return resolveRectangle(context, type, viewport, *context->x()->currentValue(), *context->y()->currentValue(), *context->width()->currentValue(), *context->height()->currentValue());
  65     }
  66
  67     static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, const SVGLength& x, const SVGLength& y, const SVGLength& width, const SVGLength& height);
  68     static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength& x, const SVGLength& y);
  69     static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength&);
  70
  71     float convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit) const;
  72     float convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit) const;
  73
  74     float valueForLength(const UnzoomedLength&, SVGLengthMode = SVGLengthMode::Other) const;
  75     float valueForLength(const Length&, const ComputedStyle&, SVGLengthMode = SVGLengthMode::Other) const;
  76     static float valueForLength(const Length&, const ComputedStyle&, float dimension);
  77
  78     bool determineViewport(FloatSize&) const;
  79
  80 private:
  81     float valueForLength(const Length&, float zoom, SVGLengthMode) const;
  82     static float valueForLength(const Length&, float zoom, float dimension);
  83
  84     float convertValueFromUserUnitsToEXS(float value) const;
  85     float convertValueFromEXSToUserUnits(float value) const;
  86
  87     float convertValueFromUserUnitsToCHS(float value) const;
  88     float convertValueFromCHSToUserUnits(float value) const;
  89
  90     RawPtrWillBeMember<const SVGElement> m_context;
  91 };
  92
  93 } // namespace blink
  94
  95 #endif // SVGLengthContext_h