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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/StringView.h>
namespace WebCore {
SVGPreserveAspectRatioValue::SVGPreserveAspectRatioValue()
: m_align(SVG_PRESERVEASPECTRATIO_XMIDYMID)
, m_meetOrSlice(SVG_MEETORSLICE_MEET)
{
}
SVGPreserveAspectRatioValue::SVGPreserveAspectRatioValue(const String& value)
{
parse(value);
}
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 { };
}
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";
}
}
}