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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/svg/SVGUnitTypes.h"
     24 #include "platform/geometry/FloatRect.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     STACK_ALLOCATED();
     54 public:
     55     explicit SVGLengthContext(const SVGElement*);
     56 
     57     template<typename T>
     58     static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
     59     {
     60         return SVGLengthContext::resolveRectangle(context, type, viewport, context->x()->currentValue(), context->y()->currentValue(), context->width()->currentValue(), context->height()->currentValue());
     61     }
     62 
     63     static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, PassRefPtr<SVGLength> x, PassRefPtr<SVGLength> y, PassRefPtr<SVGLength> width, PassRefPtr<SVGLength> height);
     64     static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, PassRefPtr<SVGLength> x, PassRefPtr<SVGLength> y);
     65     static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, PassRefPtr<SVGLength>);
     66 
     67     float convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit, ExceptionState&) const;
     68     float convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit, ExceptionState&) const;
     69 
     70     bool determineViewport(FloatSize&) const;
     71 
     72 private:
     73     SVGLengthContext(const SVGElement*, const FloatRect& viewport);
     74 
     75     float convertValueFromUserUnitsToPercentage(float value, SVGLengthMode, ExceptionState&) const;
     76     float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, ExceptionState&) const;
     77 
     78     float convertValueFromUserUnitsToEMS(float value, ExceptionState&) const;
     79     float convertValueFromEMSToUserUnits(float value, ExceptionState&) const;
     80 
     81     float convertValueFromUserUnitsToEXS(float value, ExceptionState&) const;
     82     float convertValueFromEXSToUserUnits(float value, ExceptionState&) const;
     83 
     84     RawPtrWillBeMember<const SVGElement> m_context;
     85     FloatRect m_overridenViewport;
     86 };
     87 
     88 } // namespace WebCore
     89 
     90 #endif // SVGLengthContext_h
     91