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      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/platform/graphics/FloatRect.h"
     24 #include "core/svg/SVGUnitTypes.h"
     25 
     26 namespace WebCore {
     27 
     28 class ExceptionState;
     29 class SVGElement;
     30 class SVGLength;
     31 
     32 enum SVGLengthType {
     33     LengthTypeUnknown = 0,
     34     LengthTypeNumber,
     35     LengthTypePercentage,
     36     LengthTypeEMS,
     37     LengthTypeEXS,
     38     LengthTypePX,
     39     LengthTypeCM,
     40     LengthTypeMM,
     41     LengthTypeIN,
     42     LengthTypePT,
     43     LengthTypePC
     44 };
     45 
     46 enum SVGLengthMode {
     47     LengthModeWidth = 0,
     48     LengthModeHeight,
     49     LengthModeOther
     50 };
     51 
     52 class SVGLengthContext {
     53 public:
     54     explicit SVGLengthContext(const SVGElement*);
     55 
     56     template<typename T>
     57     static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
     58     {
     59         return SVGLengthContext::resolveRectangle(context, type, viewport, context->xCurrentValue(), context->yCurrentValue(), context->widthCurrentValue(), context->heightCurrentValue());
     60     }
     61 
     62     static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, const SVGLength& x, const SVGLength& y, const SVGLength& width, const SVGLength& height);
     63     static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength& x, const SVGLength& y);
     64     static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength&);
     65 
     66     float convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit, ExceptionState&) const;
     67     float convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit, ExceptionState&) const;
     68 
     69     bool determineViewport(float& width, float& height) const;
     70 
     71 private:
     72     SVGLengthContext(const SVGElement*, const FloatRect& viewport);
     73 
     74     float convertValueFromUserUnitsToPercentage(float value, SVGLengthMode, ExceptionState&) const;
     75     float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, ExceptionState&) const;
     76 
     77     float convertValueFromUserUnitsToEMS(float value, ExceptionState&) const;
     78     float convertValueFromEMSToUserUnits(float value, ExceptionState&) const;
     79 
     80     float convertValueFromUserUnitsToEXS(float value, ExceptionState&) const;
     81     float convertValueFromEXSToUserUnits(float value, ExceptionState&) const;
     82 
     83     const SVGElement* m_context;
     84     FloatRect m_overridenViewport;
     85 };
     86 
     87 } // namespace WebCore
     88 
     89 #endif // SVGLengthContext_h
     90