private static void RandomSwitch(byte[] pixelValues, int imageWidth, int imageHeight, int level)
{
int index = 0;
for (int i = 0; i < imageHeight; i++)
{
for (int j = 0; j < imageWidth; j++)
{
int yoff = i + MathTool.GetRandom(level * 3);
if (yoff >= imageHeight)
{
yoff = imageHeight - 1;
}
int xoff = j + MathTool.GetRandom(level * 3);
if (xoff >= imageWidth)
{
xoff = imageWidth - 1;
}
int tindex = (yoff * imageWidth + xoff) * 4;
pixelValues[index] = pixelValues[tindex];
index++;
pixelValues[index] = pixelValues[tindex + 1];
index++;
pixelValues[index] = pixelValues[tindex + 2];
index++;
pixelValues[index] = pixelValues[tindex + 3];
index++; //A
}
}
}
private static void RandomColumnMove(byte[] pixelValues, int imageWidth, int imageHeight, int level)
{
for (int i = 0; i < imageWidth; i++)
{
int direct = MathTool.GetRandom(2);
int len = MathTool.GetRandom(level * 3);
if (direct == 0)
{
for (int j = imageHeight - 1; j >= 0; j--)
{
int yoff = j - len;
if (yoff < 0)
{
yoff = 0;
}
int index = (j * imageWidth + i) * 4;
int tindex = (yoff * imageWidth + i) * 4;
pixelValues[index] = pixelValues[tindex];
pixelValues[index + 1] = pixelValues[tindex + 1];
pixelValues[index + 2] = pixelValues[tindex + 2];
pixelValues[index + 3] = pixelValues[tindex + 3];
}
}
else
{
for (int j = 0; j < imageHeight; j++)
{
int yoff = j + len;
if (yoff >= imageHeight)
{
yoff = imageHeight - 1;
}
int index = (j * imageWidth + i) * 4;
int tindex = (yoff * imageWidth + i) * 4;
pixelValues[index] = pixelValues[tindex];
pixelValues[index + 1] = pixelValues[tindex + 1];
pixelValues[index + 2] = pixelValues[tindex + 2];
pixelValues[index + 3] = pixelValues[tindex + 3];
}
}
}
}
private static void RandomRowMove(byte[] pixelValues, int imageWidth, int imageHeight, int level)
{
for (int i = 0; i < imageHeight; i++)
{
int direct = MathTool.GetRandom(2);
int len = MathTool.GetRandom(level * 3);
if (direct == 0) //右移
{
for (int j = imageWidth - 1; j >= 0; j--)
{
int xoff = j - len;
if (xoff < 0)
{
xoff = 0;
}
int index = (i * imageWidth + j) * 4;
int tindex = (i * imageWidth + xoff) * 4;
pixelValues[index] = pixelValues[tindex];
pixelValues[index + 1] = pixelValues[tindex + 1];
pixelValues[index + 2] = pixelValues[tindex + 2];
pixelValues[index + 3] = pixelValues[tindex + 3];
}
}
else
{
for (int j = 0; j < imageWidth; j++)
{
int xoff = j + len;
if (xoff >= imageWidth)
{
xoff = imageWidth - 1;
}
int index = (i * imageWidth + j) * 4;
int tindex = (i * imageWidth + xoff) * 4;
pixelValues[index] = pixelValues[tindex];
pixelValues[index + 1] = pixelValues[tindex + 1];
pixelValues[index + 2] = pixelValues[tindex + 2];
pixelValues[index + 3] = pixelValues[tindex + 3];
}
}
}
}
private static void RandomPoint(byte[] pixelValues, int imageWidth, int imageHeight, int level)
{
int index = 0;
for (int i = 0; i < imageHeight; i++)
{
for (int j = 0; j < imageWidth; j++)
{
if (MathTool.GetRandom(100) > level * 10)
{
index += 4;
continue;
}
int pv = MathTool.GetRandom(255);
pixelValues[index] = (byte)pv; //B
index++;
pixelValues[index] = (byte)pv; //G
index++;
pixelValues[index] = (byte)pv; //R
index++;
index++; //A
}
}
}