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