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      1 /*
      2  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2010 Dirk Schulze <krit (at) webkit.org>
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 #include "core/svg/SVGPreserveAspectRatio.h"
     24 
     25 #include "bindings/v8/ExceptionState.h"
     26 #include "bindings/v8/ExceptionStatePlaceholder.h"
     27 #include "core/dom/ExceptionCode.h"
     28 #include "core/svg/SVGAnimationElement.h"
     29 #include "core/svg/SVGParserUtilities.h"
     30 #include "platform/geometry/FloatRect.h"
     31 #include "platform/transforms/AffineTransform.h"
     32 #include "wtf/text/WTFString.h"
     33 
     34 namespace WebCore {
     35 
     36 SVGPreserveAspectRatio::SVGPreserveAspectRatio()
     37     : SVGPropertyBase(classType())
     38 {
     39     setDefault();
     40 }
     41 
     42 void SVGPreserveAspectRatio::setDefault()
     43 {
     44     m_align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
     45     m_meetOrSlice = SVG_MEETORSLICE_MEET;
     46 }
     47 
     48 PassRefPtr<SVGPreserveAspectRatio> SVGPreserveAspectRatio::clone() const
     49 {
     50     RefPtr<SVGPreserveAspectRatio> preserveAspectRatio = create();
     51 
     52     preserveAspectRatio->m_align = m_align;
     53     preserveAspectRatio->m_meetOrSlice = m_meetOrSlice;
     54 
     55     return preserveAspectRatio.release();
     56 }
     57 
     58 PassRefPtr<SVGPropertyBase> SVGPreserveAspectRatio::cloneForAnimation(const String& value) const
     59 {
     60     RefPtr<SVGPreserveAspectRatio> preserveAspectRatio = create();
     61 
     62     preserveAspectRatio->setValueAsString(value, IGNORE_EXCEPTION);
     63 
     64     return preserveAspectRatio.release();
     65 }
     66 
     67 template<typename CharType>
     68 bool SVGPreserveAspectRatio::parseInternal(const CharType*& ptr, const CharType* end, bool validate)
     69 {
     70     SVGPreserveAspectRatioType align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
     71     SVGMeetOrSliceType meetOrSlice = SVG_MEETORSLICE_MEET;
     72 
     73     setAlign(align);
     74     setMeetOrSlice(meetOrSlice);
     75 
     76     if (!skipOptionalSVGSpaces(ptr, end))
     77         return false;
     78 
     79     if (*ptr == 'd') {
     80         if (!skipString(ptr, end, "defer"))
     81             return false;
     82 
     83         // FIXME: We just ignore the "defer" here.
     84         if (ptr == end)
     85             return true;
     86 
     87         if (!skipOptionalSVGSpaces(ptr, end))
     88             return false;
     89     }
     90 
     91     if (*ptr == 'n') {
     92         if (!skipString(ptr, end, "none"))
     93             return false;
     94         align = SVG_PRESERVEASPECTRATIO_NONE;
     95         skipOptionalSVGSpaces(ptr, end);
     96     } else if (*ptr == 'x') {
     97         if ((end - ptr) < 8)
     98             return false;
     99         if (ptr[1] != 'M' || ptr[4] != 'Y' || ptr[5] != 'M')
    100             return false;
    101         if (ptr[2] == 'i') {
    102             if (ptr[3] == 'n') {
    103                 if (ptr[6] == 'i') {
    104                     if (ptr[7] == 'n')
    105                         align = SVG_PRESERVEASPECTRATIO_XMINYMIN;
    106                     else if (ptr[7] == 'd')
    107                         align = SVG_PRESERVEASPECTRATIO_XMINYMID;
    108                     else
    109                         return false;
    110                 } else if (ptr[6] == 'a' && ptr[7] == 'x') {
    111                     align = SVG_PRESERVEASPECTRATIO_XMINYMAX;
    112                 } else {
    113                     return false;
    114                 }
    115             } else if (ptr[3] == 'd') {
    116                 if (ptr[6] == 'i') {
    117                     if (ptr[7] == 'n')
    118                         align = SVG_PRESERVEASPECTRATIO_XMIDYMIN;
    119                     else if (ptr[7] == 'd')
    120                         align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
    121                     else
    122                         return false;
    123                 } else if (ptr[6] == 'a' && ptr[7] == 'x') {
    124                     align = SVG_PRESERVEASPECTRATIO_XMIDYMAX;
    125                 } else {
    126                     return false;
    127                 }
    128             } else {
    129                 return false;
    130             }
    131         } else if (ptr[2] == 'a' && ptr[3] == 'x') {
    132             if (ptr[6] == 'i') {
    133                 if (ptr[7] == 'n')
    134                     align = SVG_PRESERVEASPECTRATIO_XMAXYMIN;
    135                 else if (ptr[7] == 'd')
    136                     align = SVG_PRESERVEASPECTRATIO_XMAXYMID;
    137                 else
    138                     return false;
    139             } else if (ptr[6] == 'a' && ptr[7] == 'x') {
    140                 align = SVG_PRESERVEASPECTRATIO_XMAXYMAX;
    141             } else {
    142                 return false;
    143             }
    144         } else {
    145             return false;
    146         }
    147         ptr += 8;
    148         skipOptionalSVGSpaces(ptr, end);
    149     } else {
    150         return false;
    151     }
    152 
    153     if (ptr < end) {
    154         if (*ptr == 'm') {
    155             if (!skipString(ptr, end, "meet"))
    156                 return false;
    157             skipOptionalSVGSpaces(ptr, end);
    158         } else if (*ptr == 's') {
    159             if (!skipString(ptr, end, "slice"))
    160                 return false;
    161             skipOptionalSVGSpaces(ptr, end);
    162             if (align != SVG_PRESERVEASPECTRATIO_NONE)
    163                 meetOrSlice = SVG_MEETORSLICE_SLICE;
    164         }
    165     }
    166 
    167     if (end != ptr && validate)
    168         return false;
    169 
    170     setAlign(align);
    171     setMeetOrSlice(meetOrSlice);
    172 
    173     return true;
    174 }
    175 
    176 void SVGPreserveAspectRatio::setValueAsString(const String& string, ExceptionState& exceptionState)
    177 {
    178     setDefault();
    179 
    180     if (string.isEmpty())
    181         return;
    182 
    183     bool valid = false;
    184     if (string.is8Bit()) {
    185         const LChar* ptr = string.characters8();
    186         const LChar* end = ptr + string.length();
    187         valid = parseInternal(ptr, end, true);
    188     } else {
    189         const UChar* ptr = string.characters16();
    190         const UChar* end = ptr + string.length();
    191         valid = parseInternal(ptr, end, true);
    192     }
    193 
    194     if (!valid) {
    195         exceptionState.throwDOMException(SyntaxError, "The value provided ('" + string + "') is invalid.");
    196     }
    197 }
    198 
    199 bool SVGPreserveAspectRatio::parse(const LChar*& ptr, const LChar* end, bool validate)
    200 {
    201     return parseInternal(ptr, end, validate);
    202 }
    203 
    204 bool SVGPreserveAspectRatio::parse(const UChar*& ptr, const UChar* end, bool validate)
    205 {
    206     return parseInternal(ptr, end, validate);
    207 }
    208 
    209 void SVGPreserveAspectRatio::transformRect(FloatRect& destRect, FloatRect& srcRect)
    210 {
    211     if (m_align == SVG_PRESERVEASPECTRATIO_NONE)
    212         return;
    213 
    214     FloatSize imageSize = srcRect.size();
    215     float origDestWidth = destRect.width();
    216     float origDestHeight = destRect.height();
    217     switch (m_meetOrSlice) {
    218     case SVGPreserveAspectRatio::SVG_MEETORSLICE_UNKNOWN:
    219         break;
    220     case SVGPreserveAspectRatio::SVG_MEETORSLICE_MEET: {
    221         float widthToHeightMultiplier = srcRect.height() / srcRect.width();
    222         if (origDestHeight > origDestWidth * widthToHeightMultiplier) {
    223             destRect.setHeight(origDestWidth * widthToHeightMultiplier);
    224             switch (m_align) {
    225             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMID:
    226             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
    227             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
    228                 destRect.setY(destRect.y() + origDestHeight / 2 - destRect.height() / 2);
    229                 break;
    230             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMAX:
    231             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
    232             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
    233                 destRect.setY(destRect.y() + origDestHeight - destRect.height());
    234                 break;
    235             default:
    236                 break;
    237             }
    238         }
    239         if (origDestWidth > origDestHeight / widthToHeightMultiplier) {
    240             destRect.setWidth(origDestHeight / widthToHeightMultiplier);
    241             switch (m_align) {
    242             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMIN:
    243             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
    244             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
    245                 destRect.setX(destRect.x() + origDestWidth / 2 - destRect.width() / 2);
    246                 break;
    247             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMIN:
    248             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
    249             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
    250                 destRect.setX(destRect.x() + origDestWidth - destRect.width());
    251                 break;
    252             default:
    253                 break;
    254             }
    255         }
    256         break;
    257     }
    258     case SVGPreserveAspectRatio::SVG_MEETORSLICE_SLICE: {
    259         float widthToHeightMultiplier = srcRect.height() / srcRect.width();
    260         // if the destination height is less than the height of the image we'll be drawing
    261         if (origDestHeight < origDestWidth * widthToHeightMultiplier) {
    262             float destToSrcMultiplier = srcRect.width() / destRect.width();
    263             srcRect.setHeight(destRect.height() * destToSrcMultiplier);
    264             switch (m_align) {
    265             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMID:
    266             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
    267             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
    268                 srcRect.setY(srcRect.y() + imageSize.height() / 2 - srcRect.height() / 2);
    269                 break;
    270             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMAX:
    271             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
    272             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
    273                 srcRect.setY(srcRect.y() + imageSize.height() - srcRect.height());
    274                 break;
    275             default:
    276                 break;
    277             }
    278         }
    279         // if the destination width is less than the width of the image we'll be drawing
    280         if (origDestWidth < origDestHeight / widthToHeightMultiplier) {
    281             float destToSrcMultiplier = srcRect.height() / destRect.height();
    282             srcRect.setWidth(destRect.width() * destToSrcMultiplier);
    283             switch (m_align) {
    284             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMIN:
    285             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID:
    286             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX:
    287                 srcRect.setX(srcRect.x() + imageSize.width() / 2 - srcRect.width() / 2);
    288                 break;
    289             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMIN:
    290             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID:
    291             case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX:
    292                 srcRect.setX(srcRect.x() + imageSize.width() - srcRect.width());
    293                 break;
    294             default:
    295                 break;
    296             }
    297         }
    298         break;
    299     }
    300     }
    301 }
    302 
    303 AffineTransform SVGPreserveAspectRatio::getCTM(float logicalX, float logicalY, float logicalWidth, float logicalHeight, float physicalWidth, float physicalHeight) const
    304 {
    305     AffineTransform transform;
    306     if (m_align == SVG_PRESERVEASPECTRATIO_UNKNOWN)
    307         return transform;
    308 
    309     double extendedLogicalX = logicalX;
    310     double extendedLogicalY = logicalY;
    311     double extendedLogicalWidth = logicalWidth;
    312     double extendedLogicalHeight = logicalHeight;
    313     double extendedPhysicalWidth = physicalWidth;
    314     double extendedPhysicalHeight = physicalHeight;
    315     double logicalRatio = extendedLogicalWidth / extendedLogicalHeight;
    316     double physicalRatio = extendedPhysicalWidth / extendedPhysicalHeight;
    317 
    318     if (m_align == SVG_PRESERVEASPECTRATIO_NONE) {
    319         transform.scaleNonUniform(extendedPhysicalWidth / extendedLogicalWidth, extendedPhysicalHeight / extendedLogicalHeight);
    320         transform.translate(-extendedLogicalX, -extendedLogicalY);
    321         return transform;
    322     }
    323 
    324     if ((logicalRatio < physicalRatio && (m_meetOrSlice == SVG_MEETORSLICE_MEET)) || (logicalRatio >= physicalRatio && (m_meetOrSlice == SVG_MEETORSLICE_SLICE))) {
    325         transform.scaleNonUniform(extendedPhysicalHeight / extendedLogicalHeight, extendedPhysicalHeight / extendedLogicalHeight);
    326 
    327         if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMINYMAX)
    328             transform.translate(-extendedLogicalX, -extendedLogicalY);
    329         else if (m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMAX)
    330             transform.translate(-extendedLogicalX - (extendedLogicalWidth - extendedPhysicalWidth * extendedLogicalHeight / extendedPhysicalHeight) / 2, -extendedLogicalY);
    331         else
    332             transform.translate(-extendedLogicalX - (extendedLogicalWidth - extendedPhysicalWidth * extendedLogicalHeight / extendedPhysicalHeight), -extendedLogicalY);
    333 
    334         return transform;
    335     }
    336 
    337     transform.scaleNonUniform(extendedPhysicalWidth / extendedLogicalWidth, extendedPhysicalWidth / extendedLogicalWidth);
    338 
    339     if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMIN)
    340         transform.translate(-extendedLogicalX, -extendedLogicalY);
    341     else if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMID)
    342         transform.translate(-extendedLogicalX, -extendedLogicalY - (extendedLogicalHeight - extendedPhysicalHeight * extendedLogicalWidth / extendedPhysicalWidth) / 2);
    343     else
    344         transform.translate(-extendedLogicalX, -extendedLogicalY - (extendedLogicalHeight - extendedPhysicalHeight * extendedLogicalWidth / extendedPhysicalWidth));
    345 
    346     return transform;
    347 }
    348 
    349 String SVGPreserveAspectRatio::valueAsString() const
    350 {
    351     String alignType;
    352 
    353     switch (m_align) {
    354     case SVG_PRESERVEASPECTRATIO_NONE:
    355         alignType = "none";
    356         break;
    357     case SVG_PRESERVEASPECTRATIO_XMINYMIN:
    358         alignType = "xMinYMin";
    359         break;
    360     case SVG_PRESERVEASPECTRATIO_XMIDYMIN:
    361         alignType = "xMidYMin";
    362         break;
    363     case SVG_PRESERVEASPECTRATIO_XMAXYMIN:
    364         alignType = "xMaxYMin";
    365         break;
    366     case SVG_PRESERVEASPECTRATIO_XMINYMID:
    367         alignType = "xMinYMid";
    368         break;
    369     case SVG_PRESERVEASPECTRATIO_XMIDYMID:
    370         alignType = "xMidYMid";
    371         break;
    372     case SVG_PRESERVEASPECTRATIO_XMAXYMID:
    373         alignType = "xMaxYMid";
    374         break;
    375     case SVG_PRESERVEASPECTRATIO_XMINYMAX:
    376         alignType = "xMinYMax";
    377         break;
    378     case SVG_PRESERVEASPECTRATIO_XMIDYMAX:
    379         alignType = "xMidYMax";
    380         break;
    381     case SVG_PRESERVEASPECTRATIO_XMAXYMAX:
    382         alignType = "xMaxYMax";
    383         break;
    384     case SVG_PRESERVEASPECTRATIO_UNKNOWN:
    385         alignType = "unknown";
    386         break;
    387     };
    388 
    389     switch (m_meetOrSlice) {
    390     default:
    391     case SVG_MEETORSLICE_UNKNOWN:
    392         return alignType;
    393     case SVG_MEETORSLICE_MEET:
    394         return alignType + " meet";
    395     case SVG_MEETORSLICE_SLICE:
    396         return alignType + " slice";
    397     }
    398 }
    399 
    400 void SVGPreserveAspectRatio::add(PassRefPtrWillBeRawPtr<SVGPropertyBase> other, SVGElement*)
    401 {
    402     ASSERT_NOT_REACHED();
    403 }
    404 
    405 void SVGPreserveAspectRatio::calculateAnimatedValue(SVGAnimationElement* animationElement, float percentage, unsigned repeatCount, PassRefPtr<SVGPropertyBase> fromValue, PassRefPtr<SVGPropertyBase> toValue, PassRefPtr<SVGPropertyBase>, SVGElement*)
    406 {
    407     ASSERT(animationElement);
    408 
    409     bool useToValue;
    410     animationElement->animateDiscreteType(percentage, false, true, useToValue);
    411 
    412     RefPtr<SVGPreserveAspectRatio> preserveAspectRatioToUse = useToValue ? toSVGPreserveAspectRatio(toValue) : toSVGPreserveAspectRatio(fromValue);
    413 
    414     m_align = preserveAspectRatioToUse->m_align;
    415     m_meetOrSlice = preserveAspectRatioToUse->m_meetOrSlice;
    416 }
    417 
    418 float SVGPreserveAspectRatio::calculateDistance(PassRefPtr<SVGPropertyBase> toValue, SVGElement* contextElement)
    419 {
    420     // No paced animations for SVGPreserveAspectRatio.
    421     return -1;
    422 }
    423 
    424 }
    425