public bool Add(NativeAPI.stbrp_rect rect)
{
if (rect.w > m_atlasSize || rect.h > m_atlasSize)
{
if (IsGrowable())
{
Realloc(Mathf.Max(rect.w, rect.h));
}
else
{
throw new Exception();
}
}
var requireArea = rect.w * rect.h;
var totalArea = m_atlasSize * m_atlasSize;
if (totalArea - m_usedArea - requireArea <= 0)
{
return(false);
}
RETRY:
fixed(NativeAPI.stbrp_context *ctx_ = &m_ctx)
{
NativeAPI.stbrp_pack_rects(ctx_, &rect, 1);
}
if (rect.was_packed != 0)
{
var maxx = rect.x + rect.w;
var maxy = rect.y + rect.h;
if (maxx > m_usedWidth)
{
m_usedWidth = maxx;
}
if (maxy > m_usedHeight)
{
m_usedHeight = maxy;
}
m_usedArea += requireArea;
m_packedRects.Add(rect);
return(true);
}
else
{
if (IsGrowable())
{
Realloc(m_atlasSize << 1);
goto RETRY;
}
}
return(false);
}
public void Realloc(int maxSize)
{
maxSize = MathLib.CeilPowerOfTwo(maxSize);
if (maxSize != m_atlasSize)
{
if (m_pool != null)
{
m_poolHandle.Free();
}
m_usedWidth = 0;
m_usedHeight = 0;
m_usedArea = 0;
m_atlasSize = maxSize;
m_pool = new NativeAPI.stbrp_node[m_atlasSize * 4];
UDebug.Assert(m_pool != null && m_pool.Length > 0);
m_poolHandle = GCHandle.Alloc(m_pool, GCHandleType.Pinned);
var packedRects = m_packedRects;
m_packedRects = new List <NativeAPI.stbrp_rect>();
m_ctx = new NativeAPI.stbrp_context();
fixed(NativeAPI.stbrp_context *_ctx = &m_ctx)
{
NativeAPI.stbrp_init_target(_ctx, m_atlasSize, m_atlasSize, (NativeAPI.stbrp_node *)m_poolHandle.AddrOfPinnedObject(), m_pool.Length);
NativeAPI.stbrp_setup_allow_out_of_mem(_ctx, 1);
}
for (int i = 0; i < packedRects.Count; ++i)
{
var rect = packedRects[i];
var _rect = new NativeAPI.stbrp_rect();
_rect.w = rect.w;
_rect.h = rect.h;
_rect.id = rect.id;
if (!Add(rect))
{
UDebug.LogError("Realloc failed!");
break;
}
}
}
}