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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2015 - ROLI Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE 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 General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
#if JUCE_MSVC && JUCE_DEBUG
#pragma optimize ("t", on)
#endif
//==============================================================================
PathFlatteningIterator::PathFlatteningIterator (const Path& path_,
const AffineTransform& transform_,
const float tolerance)
: x2 (0),
y2 (0),
closesSubPath (false),
subPathIndex (-1),
path (path_),
transform (transform_),
points (path_.data.elements),
toleranceSquared (tolerance * tolerance),
subPathCloseX (0),
subPathCloseY (0),
isIdentityTransform (transform_.isIdentity()),
stackBase (32),
index (0),
stackSize (32)
{
stackPos = stackBase;
}
PathFlatteningIterator::~PathFlatteningIterator()
{
}
bool PathFlatteningIterator::isLastInSubpath() const noexcept
{
return stackPos == stackBase.getData()
&& (index >= path.numElements || points [index] == Path::moveMarker);
}
bool PathFlatteningIterator::next()
{
x1 = x2;
y1 = y2;
float x3 = 0;
float y3 = 0;
float x4 = 0;
float y4 = 0;
for (;;)
{
float type;
if (stackPos == stackBase)
{
if (index >= path.numElements)
return false;
type = points [index++];
if (type != Path::closeSubPathMarker)
{
x2 = points [index++];
y2 = points [index++];
if (type == Path::quadMarker)
{
x3 = points [index++];
y3 = points [index++];
if (! isIdentityTransform)
transform.transformPoints (x2, y2, x3, y3);
}
else if (type == Path::cubicMarker)
{
x3 = points [index++];
y3 = points [index++];
x4 = points [index++];
y4 = points [index++];
if (! isIdentityTransform)
transform.transformPoints (x2, y2, x3, y3, x4, y4);
}
else
{
if (! isIdentityTransform)
transform.transformPoint (x2, y2);
}
}
}
else
{
type = *--stackPos;
if (type != Path::closeSubPathMarker)
{
x2 = *--stackPos;
y2 = *--stackPos;
if (type == Path::quadMarker)
{
x3 = *--stackPos;
y3 = *--stackPos;
}
else if (type == Path::cubicMarker)
{
x3 = *--stackPos;
y3 = *--stackPos;
x4 = *--stackPos;
y4 = *--stackPos;
}
}
}
if (type == Path::lineMarker)
{
++subPathIndex;
closesSubPath = (stackPos == stackBase)
&& (index < path.numElements)
&& (points [index] == Path::closeSubPathMarker)
&& x2 == subPathCloseX
&& y2 == subPathCloseY;
return true;
}
if (type == Path::quadMarker)
{
const size_t offset = (size_t) (stackPos - stackBase);
if (offset >= stackSize - 10)
{
stackSize <<= 1;
stackBase.realloc (stackSize);
stackPos = stackBase + offset;
}
const float m1x = (x1 + x2) * 0.5f;
const float m1y = (y1 + y2) * 0.5f;
const float m2x = (x2 + x3) * 0.5f;
const float m2y = (y2 + y3) * 0.5f;
const float m3x = (m1x + m2x) * 0.5f;
const float m3y = (m1y + m2y) * 0.5f;
const float errorX = m3x - x2;
const float errorY = m3y - y2;
if (errorX * errorX + errorY * errorY > toleranceSquared)
{
*stackPos++ = y3;
*stackPos++ = x3;
*stackPos++ = m2y;
*stackPos++ = m2x;
*stackPos++ = Path::quadMarker;
*stackPos++ = m3y;
*stackPos++ = m3x;
*stackPos++ = m1y;
*stackPos++ = m1x;
*stackPos++ = Path::quadMarker;
}
else
{
*stackPos++ = y3;
*stackPos++ = x3;
*stackPos++ = Path::lineMarker;
*stackPos++ = m3y;
*stackPos++ = m3x;
*stackPos++ = Path::lineMarker;
}
jassert (stackPos < stackBase + stackSize);
}
else if (type == Path::cubicMarker)
{
const size_t offset = (size_t) (stackPos - stackBase);
if (offset >= stackSize - 16)
{
stackSize <<= 1;
stackBase.realloc (stackSize);
stackPos = stackBase + offset;
}
const float m1x = (x1 + x2) * 0.5f;
const float m1y = (y1 + y2) * 0.5f;
const float m2x = (x3 + x2) * 0.5f;
const float m2y = (y3 + y2) * 0.5f;
const float m3x = (x3 + x4) * 0.5f;
const float m3y = (y3 + y4) * 0.5f;
const float m4x = (m1x + m2x) * 0.5f;
const float m4y = (m1y + m2y) * 0.5f;
const float m5x = (m3x + m2x) * 0.5f;
const float m5y = (m3y + m2y) * 0.5f;
const float error1X = m4x - x2;
const float error1Y = m4y - y2;
const float error2X = m5x - x3;
const float error2Y = m5y - y3;
if (error1X * error1X + error1Y * error1Y > toleranceSquared
|| error2X * error2X + error2Y * error2Y > toleranceSquared)
{
*stackPos++ = y4;
*stackPos++ = x4;
*stackPos++ = m3y;
*stackPos++ = m3x;
*stackPos++ = m5y;
*stackPos++ = m5x;
*stackPos++ = Path::cubicMarker;
*stackPos++ = (m4y + m5y) * 0.5f;
*stackPos++ = (m4x + m5x) * 0.5f;
*stackPos++ = m4y;
*stackPos++ = m4x;
*stackPos++ = m1y;
*stackPos++ = m1x;
*stackPos++ = Path::cubicMarker;
}
else
{
*stackPos++ = y4;
*stackPos++ = x4;
*stackPos++ = Path::lineMarker;
*stackPos++ = m5y;
*stackPos++ = m5x;
*stackPos++ = Path::lineMarker;
*stackPos++ = m4y;
*stackPos++ = m4x;
*stackPos++ = Path::lineMarker;
}
}
else if (type == Path::closeSubPathMarker)
{
if (x2 != subPathCloseX || y2 != subPathCloseY)
{
x1 = x2;
y1 = y2;
x2 = subPathCloseX;
y2 = subPathCloseY;
closesSubPath = true;
return true;
}
}
else
{
jassert (type == Path::moveMarker);
subPathIndex = -1;
subPathCloseX = x1 = x2;
subPathCloseY = y1 = y2;
}
}
}
#if JUCE_MSVC && JUCE_DEBUG
#pragma optimize ("", on) // resets optimisations to the project defaults
#endif
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