diff options
Diffstat (limited to 'Source/WebCore/svg/SVGPreserveAspectRatioValue.cpp')
| -rw-r--r-- | Source/WebCore/svg/SVGPreserveAspectRatioValue.cpp | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/Source/WebCore/svg/SVGPreserveAspectRatioValue.cpp b/Source/WebCore/svg/SVGPreserveAspectRatioValue.cpp new file mode 100644 index 000000000..d5d393eaf --- /dev/null +++ b/Source/WebCore/svg/SVGPreserveAspectRatioValue.cpp @@ -0,0 +1,375 @@ +/* + * 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" +#include "SVGPreserveAspectRatioValue.h" + +#include "AffineTransform.h" +#include "ExceptionCode.h" +#include "FloatRect.h" +#include "SVGParserUtilities.h" +#include <wtf/text/StringView.h> + +namespace WebCore { + +SVGPreserveAspectRatioValue::SVGPreserveAspectRatioValue() + : m_align(SVG_PRESERVEASPECTRATIO_XMIDYMID) + , m_meetOrSlice(SVG_MEETORSLICE_MEET) +{ +} + +ExceptionOr<void> SVGPreserveAspectRatioValue::setAlign(unsigned short align) +{ + if (align == SVG_PRESERVEASPECTRATIO_UNKNOWN || align > SVG_PRESERVEASPECTRATIO_XMAXYMAX) + return Exception { NOT_SUPPORTED_ERR }; + + m_align = static_cast<SVGPreserveAspectRatioType>(align); + return { }; +} + +ExceptionOr<void> SVGPreserveAspectRatioValue::setMeetOrSlice(unsigned short meetOrSlice) +{ + if (meetOrSlice == SVG_MEETORSLICE_UNKNOWN || meetOrSlice > SVG_MEETORSLICE_SLICE) + return Exception { NOT_SUPPORTED_ERR }; + + m_meetOrSlice = static_cast<SVGMeetOrSliceType>(meetOrSlice); + return { }; +} + +void SVGPreserveAspectRatioValue::parse(const String& value) +{ + auto upconvertedCharacters = StringView(value).upconvertedCharacters(); + const UChar* begin = upconvertedCharacters; + parseInternal(begin, begin + value.length(), true); +} + +bool SVGPreserveAspectRatioValue::parse(const UChar*& currParam, const UChar* end, bool validate) +{ + return parseInternal(currParam, end, validate); +} + +bool SVGPreserveAspectRatioValue::parseInternal(const UChar*& currParam, const UChar* end, bool validate) +{ + SVGPreserveAspectRatioType align = SVG_PRESERVEASPECTRATIO_XMIDYMID; + SVGMeetOrSliceType meetOrSlice = SVG_MEETORSLICE_MEET; + + m_align = align; + m_meetOrSlice = meetOrSlice; + + if (!skipOptionalSVGSpaces(currParam, end)) + return false; + + if (*currParam == 'd') { + if (!skipString(currParam, end, "defer")) { + LOG_ERROR("Skipped to parse except for *defer* value."); + return false; + } + + // FIXME: We just ignore the "defer" here. + if (currParam == end) + return true; + + if (!skipOptionalSVGSpaces(currParam, end)) + return false; + } + + if (*currParam == 'n') { + if (!skipString(currParam, end, "none")) { + LOG_ERROR("Skipped to parse except for *none* value."); + return false; + } + align = SVG_PRESERVEASPECTRATIO_NONE; + skipOptionalSVGSpaces(currParam, end); + } else if (*currParam == 'x') { + if ((end - currParam) < 8) + return false; + if (currParam[1] != 'M' || currParam[4] != 'Y' || currParam[5] != 'M') + return false; + if (currParam[2] == 'i') { + if (currParam[3] == 'n') { + if (currParam[6] == 'i') { + if (currParam[7] == 'n') + align = SVG_PRESERVEASPECTRATIO_XMINYMIN; + else if (currParam[7] == 'd') + align = SVG_PRESERVEASPECTRATIO_XMINYMID; + else + return false; + } else if (currParam[6] == 'a' && currParam[7] == 'x') + align = SVG_PRESERVEASPECTRATIO_XMINYMAX; + else + return false; + } else if (currParam[3] == 'd') { + if (currParam[6] == 'i') { + if (currParam[7] == 'n') + align = SVG_PRESERVEASPECTRATIO_XMIDYMIN; + else if (currParam[7] == 'd') + align = SVG_PRESERVEASPECTRATIO_XMIDYMID; + else + return false; + } else if (currParam[6] == 'a' && currParam[7] == 'x') + align = SVG_PRESERVEASPECTRATIO_XMIDYMAX; + else + return false; + } else + return false; + } else if (currParam[2] == 'a' && currParam[3] == 'x') { + if (currParam[6] == 'i') { + if (currParam[7] == 'n') + align = SVG_PRESERVEASPECTRATIO_XMAXYMIN; + else if (currParam[7] == 'd') + align = SVG_PRESERVEASPECTRATIO_XMAXYMID; + else + return false; + } else if (currParam[6] == 'a' && currParam[7] == 'x') + align = SVG_PRESERVEASPECTRATIO_XMAXYMAX; + else + return false; + } else + return false; + currParam += 8; + skipOptionalSVGSpaces(currParam, end); + } else + return false; + + if (currParam < end) { + if (*currParam == 'm') { + if (!skipString(currParam, end, "meet")) { + LOG_ERROR("Skipped to parse except for *meet* or *slice* value."); + return false; + } + skipOptionalSVGSpaces(currParam, end); + } else if (*currParam == 's') { + if (!skipString(currParam, end, "slice")) { + LOG_ERROR("Skipped to parse except for *meet* or *slice* value."); + return false; + } + skipOptionalSVGSpaces(currParam, end); + if (align != SVG_PRESERVEASPECTRATIO_NONE) + meetOrSlice = SVG_MEETORSLICE_SLICE; + } + } + + if (end != currParam && validate) + return false; + + m_align = align; + m_meetOrSlice = meetOrSlice; + + return true; +} + +void SVGPreserveAspectRatioValue::transformRect(FloatRect& destRect, FloatRect& srcRect) +{ + if (m_align == SVG_PRESERVEASPECTRATIO_NONE) + return; + + FloatSize imageSize = srcRect.size(); + float origDestWidth = destRect.width(); + float origDestHeight = destRect.height(); + switch (m_meetOrSlice) { + case SVGPreserveAspectRatioValue::SVG_MEETORSLICE_UNKNOWN: + break; + case SVGPreserveAspectRatioValue::SVG_MEETORSLICE_MEET: { + float widthToHeightMultiplier = srcRect.height() / srcRect.width(); + if (origDestHeight > origDestWidth * widthToHeightMultiplier) { + destRect.setHeight(origDestWidth * widthToHeightMultiplier); + switch (m_align) { + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMINYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMID: + destRect.setY(destRect.y() + origDestHeight / 2 - destRect.height() / 2); + break; + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMINYMAX: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + case SVGPreserveAspectRatioValue::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 SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMIN: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + destRect.setX(destRect.x() + origDestWidth / 2 - destRect.width() / 2); + break; + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMIN: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + destRect.setX(destRect.x() + origDestWidth - destRect.width()); + break; + default: + break; + } + } + break; + } + case SVGPreserveAspectRatioValue::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 SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMINYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMID: + srcRect.setY(srcRect.y() + imageSize.height() / 2 - srcRect.height() / 2); + break; + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMINYMAX: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + srcRect.setY(srcRect.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 SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMIN: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMIDYMAX: + srcRect.setX(srcRect.x() + imageSize.width() / 2 - srcRect.width() / 2); + break; + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMIN: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMID: + case SVGPreserveAspectRatioValue::SVG_PRESERVEASPECTRATIO_XMAXYMAX: + srcRect.setX(srcRect.x() + imageSize.width() - srcRect.width()); + break; + default: + break; + } + } + break; + } + } +} + +AffineTransform SVGPreserveAspectRatioValue::getCTM(float logicalX, float logicalY, float logicalWidth, float logicalHeight, float physicalWidth, float physicalHeight) const +{ + AffineTransform transform; + if (!logicalWidth || !logicalHeight || !physicalWidth || !physicalHeight) { + ASSERT_NOT_REACHED(); + return transform; + } + + if (m_align == SVG_PRESERVEASPECTRATIO_UNKNOWN) + return transform; + + double extendedLogicalX = logicalX; + double extendedLogicalY = logicalY; + double extendedLogicalWidth = logicalWidth; + double extendedLogicalHeight = logicalHeight; + double extendedPhysicalWidth = physicalWidth; + double extendedPhysicalHeight = physicalHeight; + double logicalRatio = extendedLogicalWidth / extendedLogicalHeight; + double physicalRatio = extendedPhysicalWidth / extendedPhysicalHeight; + + if (m_align == SVG_PRESERVEASPECTRATIO_NONE) { + transform.scaleNonUniform(extendedPhysicalWidth / extendedLogicalWidth, extendedPhysicalHeight / extendedLogicalHeight); + transform.translate(-extendedLogicalX, -extendedLogicalY); + return transform; + } + + if ((logicalRatio < physicalRatio && (m_meetOrSlice == SVG_MEETORSLICE_MEET)) || (logicalRatio >= physicalRatio && (m_meetOrSlice == SVG_MEETORSLICE_SLICE))) { + transform.scaleNonUniform(extendedPhysicalHeight / extendedLogicalHeight, extendedPhysicalHeight / extendedLogicalHeight); + + if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMINYMAX) + transform.translate(-extendedLogicalX, -extendedLogicalY); + else if (m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMAX) + transform.translate(-extendedLogicalX - (extendedLogicalWidth - extendedPhysicalWidth * extendedLogicalHeight / extendedPhysicalHeight) / 2, -extendedLogicalY); + else + transform.translate(-extendedLogicalX - (extendedLogicalWidth - extendedPhysicalWidth * extendedLogicalHeight / extendedPhysicalHeight), -extendedLogicalY); + + return transform; + } + + transform.scaleNonUniform(extendedPhysicalWidth / extendedLogicalWidth, extendedPhysicalWidth / extendedLogicalWidth); + + if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMIN || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMIN) + transform.translate(-extendedLogicalX, -extendedLogicalY); + else if (m_align == SVG_PRESERVEASPECTRATIO_XMINYMID || m_align == SVG_PRESERVEASPECTRATIO_XMIDYMID || m_align == SVG_PRESERVEASPECTRATIO_XMAXYMID) + transform.translate(-extendedLogicalX, -extendedLogicalY - (extendedLogicalHeight - extendedPhysicalHeight * extendedLogicalWidth / extendedPhysicalWidth) / 2); + else + transform.translate(-extendedLogicalX, -extendedLogicalY - (extendedLogicalHeight - extendedPhysicalHeight * extendedLogicalWidth / extendedPhysicalWidth)); + + return transform; +} + +String SVGPreserveAspectRatioValue::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 alignType + " meet"; + case SVG_MEETORSLICE_SLICE: + return alignType + " slice"; + } +} + +} |