public void Clear(Color c)
{
m_bmpImage.Lock();
for (Int32 y = 0; y < m_bmpImage.Height; y++)
{
for (Int32 x = 0; x < m_bmpImage.Width; x++)
{
m_bmpImage.SetPixel(x, y, c);
}
}
m_bmpImage.Unlock();
}
internal FastBitmap Flatten(Color crBack)
{
// create a bitmap for result image
FastBitmap bmpFinal = new FastBitmap(m_nWidth, m_nHeight, PixelFormat.Format24bppRgb);
// lock all bitmaps
bmpFinal.Lock();
for (Int32 i = 0; i < m_arLayers.Count; i++)
{
Layer layer = m_arLayers[i];
layer.m_bmpImage.Lock();
if (layer.Mask != null)
{
layer.Mask.Lock();
}
}
// calculate colors of flattened image
// 1. take offsetx, offsety into consideration
// 2. calculate alpha of color (alpha, opacity, mask)
// 3. mix colors of current layer and layer below
for (Int32 y = 0; y < m_nHeight; y++)
{
for (Int32 x = 0; x < m_nWidth; x++)
{
Color c0 = m_arLayers[0].m_bmpImage.GetPixel(x, y);
for (Int32 i = 1; i < m_arLayers.Count; i++)
{
Layer layer = m_arLayers[i];
Color c1 = Color.Transparent;
if (x >= layer.OffsetX &&
x <= layer.OffsetX + layer.m_bmpImage.Width - 1 &&
y >= layer.OffsetY &&
y <= layer.OffsetY + layer.m_bmpImage.Height - 1)
{
c1 = layer.m_bmpImage.GetPixel(x - layer.OffsetX, y - layer.OffsetY);
}
if (c1.A == 255 && layer.Opacity == 1.0 &&
layer.Mask == null)
{
c0 = c1;
}
else
{
Double tr, tg, tb, a;
a = (c1.A / 255.0) * layer.Opacity;
if (layer.Mask != null)
{
a *= layer.Mask.GetIntensity(x, y) / 255.0;
}
tr = c1.R * a + c0.R * (1.0 - a);
tg = c1.G * a + c0.G * (1.0 - a);
tb = c1.B * a + c0.B * (1.0 - a);
tr = Math.Round(tr);
tg = Math.Round(tg);
if (i == 4) // shadow layer
{
tb = Math.Round(tb);
tr = Math.Min(tr, crBack.R);
tg = Math.Min(tg, crBack.G);
tb = Math.Min(tb, crBack.B);
}
else
{
tr = Math.Min(tr, 255);
tg = Math.Min(tg, 255);
tb = Math.Min(tb, 255);
}
c0 = Color.FromArgb((Byte)tr, (Byte)tg, (Byte)tb);
}
}
bmpFinal.SetPixel(x, y, c0);
}
}
// unlock all bitmaps
for (Int32 i = 0; i < m_arLayers.Count; i++)
{
Layer layer = m_arLayers[i];
layer.m_bmpImage.Unlock();
if (layer.Mask != null)
{
layer.Mask.Unlock();
}
}
bmpFinal.Unlock();
return(bmpFinal);
}
