static SwfRectIntData CalculateBitmapTrimmedRect(SwfLibraryBitmapDefine bitmap)
{
var rect = new SwfRectIntData {
xMin = bitmap.Width,
yMin = bitmap.Height,
xMax = 0,
yMax = 0
};
for (var i = 0; i < bitmap.Height; ++i)
{
for (var j = 0; j < bitmap.Width; ++j)
{
var a = bitmap.ARGB32[(j + i * bitmap.Width) * 4];
if (a > 0)
{
rect.xMin = Mathf.Min(j, rect.xMin);
rect.yMin = Mathf.Min(i, rect.yMin);
rect.xMax = Mathf.Max(j + 1, rect.xMax);
rect.yMax = Mathf.Max(i + 1, rect.yMax);
}
}
}
return(rect.width < 1 || rect.height < 1
? new SwfRectIntData(0, 0, 1, 1)
: rect);
}
static byte[] TrimBitmapByRect(SwfBitmapData bitmap, SwfRectIntData rect)
{
var argb32 = new byte[rect.area * 4];
for (var i = 0; i < rect.height; ++i)
{
var src_index = rect.xMin + (rect.yMin + i) * bitmap.RealWidth;
var dst_index = i * rect.width;
Array.Copy(
bitmap.ARGB32, src_index * 4,
argb32, dst_index * 4,
rect.width * 4);
}
return(argb32);
}