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#include "geometry/packer.hpp"
#include "base/assert.hpp"
#include "base/logging.hpp"
namespace m2
{
Packer::Packer()
: m_currentX(0),
m_currentY(0),
m_yStep(0),
m_width(0),
m_height(0),
m_currentHandle(0),
m_maxHandle(0),
m_invalidHandle(0x00FFFFFF)
{}
Packer::Packer(unsigned width, unsigned height, uint32_t maxHandle)
: m_currentX(0),
m_currentY(0),
m_yStep(0),
m_width(width),
m_height(height),
m_currentHandle(0),
m_maxHandle(maxHandle),
m_invalidHandle(0x00FFFFFF)
{
}
uint32_t Packer::invalidHandle() const
{
return m_invalidHandle;
}
Packer::handle_t Packer::pack(unsigned width, unsigned height)
{
ASSERT(width <= m_width, ());
ASSERT(height <= m_height, ());
if ((width > m_width) || (height > m_height))
return m_invalidHandle;
/// checking whether there is enough space on X axis
if (m_currentX + width > m_width)
{
m_currentY += m_yStep;
m_currentX = 0;
m_yStep = 0;
}
/// checking whether there is enough space on Y axis
if (m_currentY + height > m_height)
{
/// texture overflow detected. all packed rects should be forgotten.
callOverflowFns();
reset();
}
/// check handleOverflow
if (m_currentHandle == m_maxHandle)
{
/// handles overflow detected. all packed rects should be forgotten.
callOverflowFns();
reset();
m_currentHandle = 0;
}
/// can pack
m_yStep = max(height, m_yStep);
handle_t curHandle = m_currentHandle++;
m_rects[curHandle] = m2::RectU(m_currentX, m_currentY, m_currentX + width, m_currentY + height);
m_currentX += width;
return curHandle;
}
Packer::handle_t Packer::freeHandle()
{
if (m_currentHandle == m_maxHandle)
{
callOverflowFns();
reset();
m_currentHandle = 0;
}
return m_currentHandle++;
}
bool Packer::hasRoom(unsigned width, unsigned height) const
{
return ((m_width >= width) && (m_height - m_currentY - m_yStep >= height))
|| ((m_width - m_currentX >= width ) && (m_height - m_currentY >= height));
}
bool Packer::hasRoom(m2::PointU const * sizes, size_t cnt) const
{
unsigned currentX = m_currentX;
unsigned currentY = m_currentY;
unsigned yStep = m_yStep;
for (unsigned i = 0; i < cnt; ++i)
{
unsigned width = sizes[i].x;
unsigned height = sizes[i].y;
if (width <= m_width - currentX)
{
if (height <= m_height - currentY)
{
yStep = max(height, yStep);
currentX += width;
}
else
return false;
}
else
{
currentX = 0;
currentY += yStep;
yStep = 0;
if (width <= m_width - currentX)
{
if (height <= m_height - currentY)
{
yStep = max(height, yStep);
currentX += width;
}
else
return false;
}
}
}
return true;
}
bool Packer::isPacked(handle_t handle)
{
return m_rects.find(handle) != m_rects.end();
}
Packer::find_result_t Packer::find(handle_t handle) const
{
rects_t::const_iterator it = m_rects.find(handle);
std::pair<bool, m2::RectU> res;
res.first = (it != m_rects.end());
if (res.first)
res.second = it->second;
return res;
}
void Packer::remove(handle_t handle)
{
m_rects.erase(handle);
}
void Packer::reset()
{
m_rects.clear();
m_currentX = 0;
m_currentY = 0;
m_yStep = 0;
m_currentHandle = 0;
}
void Packer::addOverflowFn(overflowFn fn, int priority)
{
m_overflowFns.push(std::pair<size_t, overflowFn>(priority, fn));
}
void Packer::callOverflowFns()
{
LOG(LDEBUG, ("Texture|Handles Overflow"));
overflowFns handlersCopy = m_overflowFns;
while (!handlersCopy.empty())
{
handlersCopy.top().second();
handlersCopy.pop();
}
}
}
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