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/*
* 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 "FloatRect.h"
#include "SVGParserUtilities.h"
#include <wtf/text/StringConcatenateNumbers.h>
#include <wtf/text/StringParsingBuffer.h>
#include <wtf/text/StringView.h>
namespace WebCore {
SVGPreserveAspectRatioValue::SVGPreserveAspectRatioValue(StringView value)
{
parse(value);
}
SVGPreserveAspectRatioValue::SVGPreserveAspectRatioValue(SVGPreserveAspectRatioType align, SVGMeetOrSliceType meetOrSlice)
: m_align(align)
, m_meetOrSlice(meetOrSlice)
{
}
ExceptionOr<void> SVGPreserveAspectRatioValue::setAlign(unsigned short align)
{
if (align == SVG_PRESERVEASPECTRATIO_UNKNOWN || align > SVG_PRESERVEASPECTRATIO_XMAXYMAX)
return Exception { NotSupportedError };
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 { NotSupportedError };
m_meetOrSlice = static_cast<SVGMeetOrSliceType>(meetOrSlice);
return { };
}
bool SVGPreserveAspectRatioValue::parse(StringView value)
{
return readCharactersForParsing(value, [&](auto buffer) {
return parseInternal(buffer, true);
});
}
bool SVGPreserveAspectRatioValue::parse(StringParsingBuffer<LChar>& buffer, bool validate)
{
return parseInternal(buffer, validate);
}
bool SVGPreserveAspectRatioValue::parse(StringParsingBuffer<UChar>& buffer, bool validate)
{
return parseInternal(buffer, validate);
}
template<typename CharacterType> static constexpr CharacterType deferDesc[] = {'d', 'e', 'f', 'e', 'r'};
template<typename CharacterType> static constexpr CharacterType noneDesc[] = {'n', 'o', 'n', 'e'};
template<typename CharacterType> static constexpr CharacterType meetDesc[] = {'m', 'e', 'e', 't'};
template<typename CharacterType> static constexpr CharacterType sliceDesc[] = {'s', 'l', 'i', 'c', 'e'};
template<typename CharacterType> bool SVGPreserveAspectRatioValue::parseInternal(StringParsingBuffer<CharacterType>& buffer, bool validate)
{
SVGPreserveAspectRatioType align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
SVGMeetOrSliceType meetOrSlice = SVG_MEETORSLICE_MEET;
m_align = align;
m_meetOrSlice = meetOrSlice;
if (!skipOptionalSVGSpaces(buffer))
return false;
if (*buffer == 'd') {
if (!skipCharactersExactly(buffer, deferDesc<CharacterType>)) {
LOG_ERROR("Skipped to parse except for *defer* value.");
return false;
}
// FIXME: We just ignore the "defer" here.
if (buffer.atEnd())
return true;
if (!skipOptionalSVGSpaces(buffer))
return false;
}
if (*buffer == 'n') {
if (!skipCharactersExactly(buffer, noneDesc<CharacterType>)) {
LOG_ERROR("Skipped to parse except for *none* value.");
return false;
}
align = SVG_PRESERVEASPECTRATIO_NONE;
skipOptionalSVGSpaces(buffer);
} else if (*buffer == 'x') {
if (buffer.lengthRemaining() < 8)
return false;
if (buffer[1] != 'M' || buffer[4] != 'Y' || buffer[5] != 'M')
return false;
if (buffer[2] == 'i') {
if (buffer[3] == 'n') {
if (buffer[6] == 'i') {
if (buffer[7] == 'n')
align = SVG_PRESERVEASPECTRATIO_XMINYMIN;
else if (buffer[7] == 'd')
align = SVG_PRESERVEASPECTRATIO_XMINYMID;
else
return false;
} else if (buffer[6] == 'a' && buffer[7] == 'x')
align = SVG_PRESERVEASPECTRATIO_XMINYMAX;
else
return false;
} else if (buffer[3] == 'd') {
if (buffer[6] == 'i') {
if (buffer[7] == 'n')
align = SVG_PRESERVEASPECTRATIO_XMIDYMIN;
else if (buffer[7] == 'd')
align = SVG_PRESERVEASPECTRATIO_XMIDYMID;
else
return false;
} else if (buffer[6] == 'a' && buffer[7] == 'x')
align = SVG_PRESERVEASPECTRATIO_XMIDYMAX;
else
return false;
} else
return false;
} else if (buffer[2] == 'a' && buffer[3] == 'x') {
if (buffer[6] == 'i') {
if (buffer[7] == 'n')
align = SVG_PRESERVEASPECTRATIO_XMAXYMIN;
else if (buffer[7] == 'd')
align = SVG_PRESERVEASPECTRATIO_XMAXYMID;
else
return false;
} else if (buffer[6] == 'a' && buffer[7] == 'x')
align = SVG_PRESERVEASPECTRATIO_XMAXYMAX;
else
return false;
} else
return false;
buffer += 8;
skipOptionalSVGSpaces(buffer);
} else
return false;
if (buffer.hasCharactersRemaining()) {
if (*buffer == 'm') {
if (!skipCharactersExactly(buffer, meetDesc<CharacterType>)) {
LOG_ERROR("Skipped to parse except for *meet* or *slice* value.");
return false;
}
skipOptionalSVGSpaces(buffer);
} else if (*buffer == 's') {
if (!skipCharactersExactly(buffer, sliceDesc<CharacterType>)) {
LOG_ERROR("Skipped to parse except for *meet* or *slice* value.");
return false;
}
skipOptionalSVGSpaces(buffer);
if (align != SVG_PRESERVEASPECTRATIO_NONE)
meetOrSlice = SVG_MEETORSLICE_SLICE;
}
}
if (!buffer.atEnd() && validate)
return false;
m_align = align;
m_meetOrSlice = meetOrSlice;
return true;
}
void SVGPreserveAspectRatioValue::transformRect(FloatRect& destRect, FloatRect& srcRect) const
{
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
{
auto alignType = [&]() {
switch (m_align) {
case SVG_PRESERVEASPECTRATIO_NONE:
return "none"_s;
case SVG_PRESERVEASPECTRATIO_XMINYMIN:
return "xMinYMin"_s;
case SVG_PRESERVEASPECTRATIO_XMIDYMIN:
return "xMidYMin"_s;
case SVG_PRESERVEASPECTRATIO_XMAXYMIN:
return "xMaxYMin"_s;
case SVG_PRESERVEASPECTRATIO_XMINYMID:
return "xMinYMid"_s;
case SVG_PRESERVEASPECTRATIO_XMIDYMID:
return "xMidYMid"_s;
case SVG_PRESERVEASPECTRATIO_XMAXYMID:
return "xMaxYMid"_s;
case SVG_PRESERVEASPECTRATIO_XMINYMAX:
return "xMinYMax"_s;
case SVG_PRESERVEASPECTRATIO_XMIDYMAX:
return "xMidYMax"_s;
case SVG_PRESERVEASPECTRATIO_XMAXYMAX:
return "xMaxYMax"_s;
case SVG_PRESERVEASPECTRATIO_UNKNOWN:
return "unknown"_s;
};
ASSERT_NOT_REACHED();
return "unknown"_s;
};
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");
}
}
}