private void DrawOnCanvas(FDBitmap imageData, int posX, int posY, byte rotation = 0)
{
if (imageData == null)
{
return;
}
int canvasX = (posX + 2) * unitWidth - 1;
int canvasY = (posY + 2) * unitHeight - 1;
for (int i = imageData.Width - 1; i >= 0; i--)
{
for (int j = imageData.Height - 1; j >= 0; j--)
{
int targetX = canvasX + i + 1 - imageData.Width;
int targetY = canvasY + j + 1 - imageData.Height;
if (targetX < 0 || targetY < 0 || targetX >= canvasWidth || targetY >= canvasHeight)
{
continue;
}
int targetIndex = (targetY * canvasWidth + targetX) << 2;
Color clr = imageData.GetPixelColor(i, j, rotation);
// For transparent color, just skip
if (clr.A == 0 && clr.R == 0 && clr.G == 255 && clr.B == 255)
{
continue;
}
if (clr.A != 0 && clr.A != 255)
{
canvasData[targetIndex] = (byte)((canvasData[targetIndex] + clr.R) / 2);
canvasData[targetIndex + 1] = (byte)((canvasData[targetIndex] + clr.G) / 2);
canvasData[targetIndex + 2] = (byte)((canvasData[targetIndex] + clr.B) / 2);
canvasData[targetIndex + 3] = 255;
}
else
{
canvasData[targetIndex] = clr.R;
canvasData[targetIndex + 1] = clr.G;
canvasData[targetIndex + 2] = clr.B;
canvasData[targetIndex + 3] = clr.A;
}
}
}
}
public ImageDataExporter(FDBitmap data)
{
this.bitmapData = data;
}
