public void Free(BMPAlloc alloc)
{
Debug.Assert(alloc.ownedState == OwnedState.Owned);
int index = alloc.page * this.m_PageHeight + (int)alloc.pageLine;
this.m_AllocMap[index] = (this.m_AllocMap[index] | 1u << (int)alloc.bitIndex);
BitmapAllocator32.Page value = this.m_Pages[alloc.page];
value.freeSlots++;
this.m_Pages[alloc.page] = value;
}
public BMPAlloc Allocate(UIRAtlasManager atlasManager)
{
int count = this.m_Pages.Count;
BMPAlloc result;
for (int i = 0; i < count; i++)
{
BitmapAllocator32.Page page = this.m_Pages[i];
bool flag = page.freeSlots == 0;
if (!flag)
{
int j = i * this.m_PageHeight;
int num = j + this.m_PageHeight;
while (j < num)
{
uint num2 = this.m_AllocMap[j];
bool flag2 = num2 == 0u;
if (!flag2)
{
byte b = BitmapAllocator32.CountTrailingZeroes(num2);
this.m_AllocMap[j] = (num2 & ~(1u << (int)b));
page.freeSlots--;
this.m_Pages[i] = page;
result = new BMPAlloc
{
page = i,
pageLine = (ushort)(j - i * this.m_PageHeight),
bitIndex = b,
ownedState = OwnedState.Owned
};
return(result);
}
j++;
}
}
}
RectInt rectInt;
bool flag3 = atlasManager == null || !atlasManager.AllocateRect(32 * this.m_EntryWidth, this.m_PageHeight * this.m_EntryHeight, out rectInt);
if (flag3)
{
result = BMPAlloc.Invalid;
return(result);
}
this.m_AllocMap.Capacity += this.m_PageHeight;
this.m_AllocMap.Add(4294967294u);
for (int k = 1; k < this.m_PageHeight; k++)
{
this.m_AllocMap.Add(4294967295u);
}
this.m_Pages.Add(new BitmapAllocator32.Page
{
x = (ushort)rectInt.xMin,
y = (ushort)rectInt.yMin,
freeSlots = 32 * this.m_PageHeight - 1
});
result = new BMPAlloc
{
page = this.m_Pages.Count - 1,
ownedState = OwnedState.Owned
};
return(result);
}
internal void GetAllocPageAtlasLocation(int page, out ushort x, out ushort y)
{
BitmapAllocator32.Page page2 = this.m_Pages[page];
x = page2.x;
y = page2.y;
}