diff options
Diffstat (limited to 'Source/WebCore/svg/SVGPreserveAspectRatio.cpp')
| -rw-r--r-- | Source/WebCore/svg/SVGPreserveAspectRatio.cpp | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/Source/WebCore/svg/SVGPreserveAspectRatio.cpp b/Source/WebCore/svg/SVGPreserveAspectRatio.cpp new file mode 100644 index 0000000..3f1172d --- /dev/null +++ b/Source/WebCore/svg/SVGPreserveAspectRatio.cpp @@ -0,0 +1,344 @@ +/* + * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org> + * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org> + * Copyright (C) 2010 Dirk Schulze <krit@webkit.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this library; see the file COPYING.LIB. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#include "config.h" + +#if ENABLE(SVG) +#include "SVGPreserveAspectRatio.h" + +#include "AffineTransform.h" +#include "FloatRect.h" +#include "SVGParserUtilities.h" +#include <wtf/text/StringConcatenate.h> + +namespace WebCore { + +SVGPreserveAspectRatio::SVGPreserveAspectRatio() + : m_align(SVG_PRESERVEASPECTRATIO_XMIDYMID) + , m_meetOrSlice(SVG_MEETORSLICE_MEET) +{ +} + +void SVGPreserveAspectRatio::setAlign(unsigned short align, ExceptionCode& ec) +{ + if (align == SVG_PRESERVEASPECTRATIO_UNKNOWN || align > SVG_PRESERVEASPECTRATIO_XMAXYMAX) { + ec = NOT_SUPPORTED_ERR; + return; + } + + m_align = static_cast<SVGPreserveAspectRatioType>(align); +} + +void SVGPreserveAspectRatio::setMeetOrSlice(unsigned short meetOrSlice, ExceptionCode& ec) +{ + if (meetOrSlice == SVG_MEETORSLICE_UNKNOWN || meetOrSlice > SVG_MEETORSLICE_SLICE) { + ec = NOT_SUPPORTED_ERR; + return; + } + + m_meetOrSlice = static_cast<SVGMeetOrSliceType>(meetOrSlice); +} + +SVGPreserveAspectRatio SVGPreserveAspectRatio::parsePreserveAspectRatio(const UChar*& currParam, const UChar* end, bool validate, bool& result) +{ + SVGPreserveAspectRatio aspectRatio; + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_NONE; + aspectRatio.m_meetOrSlice = SVG_MEETORSLICE_MEET; + result = false; + + // FIXME: Rewrite this parser, without gotos! + if (!skipOptionalSpaces(currParam, end)) + goto bailOut; + + if (*currParam == 'd') { + if (!skipString(currParam, end, "defer")) + goto bailOut; + // FIXME: We just ignore the "defer" here. + if (!skipOptionalSpaces(currParam, end)) + goto bailOut; + } + + if (*currParam == 'n') { + if (!skipString(currParam, end, "none")) + goto bailOut; + skipOptionalSpaces(currParam, end); + } else if (*currParam == 'x') { + if ((end - currParam) < 8) + goto bailOut; + if (currParam[1] != 'M' || currParam[4] != 'Y' || currParam[5] != 'M') + goto bailOut; + if (currParam[2] == 'i') { + if (currParam[3] == 'n') { + if (currParam[6] == 'i') { + if (currParam[7] == 'n') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMINYMIN; + else if (currParam[7] == 'd') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMINYMID; + else + goto bailOut; + } else if (currParam[6] == 'a' && currParam[7] == 'x') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMINYMAX; + else + goto bailOut; + } else if (currParam[3] == 'd') { + if (currParam[6] == 'i') { + if (currParam[7] == 'n') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMIDYMIN; + else if (currParam[7] == 'd') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMIDYMID; + else + goto bailOut; + } else if (currParam[6] == 'a' && currParam[7] == 'x') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMIDYMAX; + else + goto bailOut; + } else + goto bailOut; + } else if (currParam[2] == 'a' && currParam[3] == 'x') { + if (currParam[6] == 'i') { + if (currParam[7] == 'n') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMAXYMIN; + else if (currParam[7] == 'd') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMAXYMID; + else + goto bailOut; + } else if (currParam[6] == 'a' && currParam[7] == 'x') + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_XMAXYMAX; + else + goto bailOut; + } else + goto bailOut; + currParam += 8; + skipOptionalSpaces(currParam, end); + } else + goto bailOut; + + if (currParam < end) { + if (*currParam == 'm') { + if (!skipString(currParam, end, "meet")) + goto bailOut; + skipOptionalSpaces(currParam, end); + } else if (*currParam == 's') { + if (!skipString(currParam, end, "slice")) + goto bailOut; + skipOptionalSpaces(currParam, end); + if (aspectRatio.m_align != SVG_PRESERVEASPECTRATIO_NONE) + aspectRatio.m_meetOrSlice = SVG_MEETORSLICE_SLICE; + } + } + + if (end != currParam && validate) { +bailOut: + // FIXME: Should the two values be set to UNKNOWN instead? + aspectRatio.m_align = SVG_PRESERVEASPECTRATIO_NONE; + aspectRatio.m_meetOrSlice = SVG_MEETORSLICE_MEET; + } else + result = true; + + return aspectRatio; +} + +void SVGPreserveAspectRatio::transformRect(FloatRect& destRect, FloatRect& srcRect) +{ + FloatSize imageSize = srcRect.size(); + float origDestWidth = destRect.width(); + float origDestHeight = destRect.height(); + switch (m_meetOrSlice) { + case SVGPreserveAspectRatio::SVG_MEETORSLICE_UNKNOWN: + break; + case SVGPreserveAspectRatio::SVG_MEETORSLICE_MEET: { + float widthToHeightMultiplier = srcRect.height() / srcRect.width(); + if (origDestHeight > origDestWidth * widthToHeightMultiplier) { + destRect.setHeight(origDestWidth * widthToHeightMultiplier); + switch (m_align) { + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID: + destRect.setY(destRect.y() + origDestHeight / 2 - destRect.height() / 2); + break; + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMAX: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + destRect.setY(destRect.y() + origDestHeight - destRect.height()); + break; + default: + break; + } + } + if (origDestWidth > origDestHeight / widthToHeightMultiplier) { + destRect.setWidth(origDestHeight / widthToHeightMultiplier); + switch (m_align) { + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMIN: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + destRect.setX(destRect.x() + origDestWidth / 2 - destRect.width() / 2); + break; + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMIN: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + destRect.setX(destRect.x() + origDestWidth - destRect.width()); + break; + default: + break; + } + } + break; + } + case SVGPreserveAspectRatio::SVG_MEETORSLICE_SLICE: { + float widthToHeightMultiplier = srcRect.height() / srcRect.width(); + // if the destination height is less than the height of the image we'll be drawing + if (origDestHeight < origDestWidth * widthToHeightMultiplier) { + float destToSrcMultiplier = srcRect.width() / destRect.width(); + srcRect.setHeight(destRect.height() * destToSrcMultiplier); + switch (m_align) { + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID: + srcRect.setY(destRect.y() + imageSize.height() / 2 - srcRect.height() / 2); + break; + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMINYMAX: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + srcRect.setY(destRect.y() + imageSize.height() - srcRect.height()); + break; + default: + break; + } + } + // if the destination width is less than the width of the image we'll be drawing + if (origDestWidth < origDestHeight / widthToHeightMultiplier) { + float destToSrcMultiplier = srcRect.height() / destRect.height(); + srcRect.setWidth(destRect.width() * destToSrcMultiplier); + switch (m_align) { + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMIN: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + srcRect.setX(destRect.x() + imageSize.width() / 2 - srcRect.width() / 2); + break; + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMIN: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMID: + case SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + srcRect.setX(destRect.x() + imageSize.width() - srcRect.width()); + break; + default: + break; + } + } + break; + } + } +} + +// FIXME: We should use floats here, like everywhere else! +AffineTransform SVGPreserveAspectRatio::getCTM(double logicX, double logicY, double logicWidth, double logicHeight, double physWidth, double physHeight) const +{ + AffineTransform transform; + if (m_align == SVG_PRESERVEASPECTRATIO_UNKNOWN) + return transform; + + double logicalRatio = logicWidth / logicHeight; + double physRatio = physWidth / physHeight; + + if (m_align == SVG_PRESERVEASPECTRATIO_NONE) { + transform.scaleNonUniform(physWidth / logicWidth, physHeight / logicHeight); + transform.translate(-logicX, -logicY); + return transform; + } + + if ((logicalRatio < physRatio && (m_meetOrSlice == SVG_MEETORSLICE_MEET)) || (logicalRatio >= physRatio && (m_meetOrSlice == SVG_MEETORSLICE_SLICE))) { + transform.scaleNonUniform(physHeight / logicHeight, physHeight / logicHeight); + + if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMINYMAX) + transform.translate(-logicX, -logicY); + else if (m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMAX) + transform.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight) / 2, -logicY); + else + transform.translate(-logicX - (logicWidth - physWidth * logicHeight / physHeight), -logicY); + + return transform; + } + + transform.scaleNonUniform(physWidth / logicWidth, physWidth / logicWidth); + + if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMIN) + transform.translate(-logicX, -logicY); + else if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMID) + transform.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth) / 2); + else + transform.translate(-logicX, -logicY - (logicHeight - physHeight * logicWidth / physWidth)); + + return transform; +} + +String SVGPreserveAspectRatio::valueAsString() const +{ + String alignType; + + switch (m_align) { + case SVG_PRESERVEASPECTRATIO_NONE: + alignType = "none"; + break; + case SVG_PRESERVEASPECTRATIO_XMINYMIN: + alignType = "xMinYMin"; + break; + case SVG_PRESERVEASPECTRATIO_XMIDYMIN: + alignType = "xMidYMin"; + break; + case SVG_PRESERVEASPECTRATIO_XMAXYMIN: + alignType = "xMaxYMin"; + break; + case SVG_PRESERVEASPECTRATIO_XMINYMID: + alignType = "xMinYMid"; + break; + case SVG_PRESERVEASPECTRATIO_XMIDYMID: + alignType = "xMidYMid"; + break; + case SVG_PRESERVEASPECTRATIO_XMAXYMID: + alignType = "xMaxYMid"; + break; + case SVG_PRESERVEASPECTRATIO_XMINYMAX: + alignType = "xMinYMax"; + break; + case SVG_PRESERVEASPECTRATIO_XMIDYMAX: + alignType = "xMidYMax"; + break; + case SVG_PRESERVEASPECTRATIO_XMAXYMAX: + alignType = "xMaxYMax"; + break; + case SVG_PRESERVEASPECTRATIO_UNKNOWN: + alignType = "unknown"; + break; + }; + + switch (m_meetOrSlice) { + default: + case SVG_MEETORSLICE_UNKNOWN: + return alignType; + case SVG_MEETORSLICE_MEET: + return makeString(alignType, " meet"); + case SVG_MEETORSLICE_SLICE: + return makeString(alignType, " slice"); + }; +} + +} + +#endif // ENABLE(SVG) |