static void fillScreen(byte[] buf, pBGRA color, int pixelWidth)
{
int stride = (pixelWidth * 32) / 8;
int pixelHeight = buf.Length / stride;
for (int y = 0; y < pixelHeight; y++)
{
for (int x = 0; x < pixelWidth; x++)
{
printPixel(buf, x, y, color, pixelWidth);
}
}
}
static void printPixel(byte[] buf, int x, int y, pBGRA color, int pixelWidth)
{
int blue = color.blue;
int green = color.green;
int red = color.red;
int alpha = color.alpha;
int pixelOffset = (x + y * pixelWidth) * 32 / 8;
buf[pixelOffset] = (byte)blue;
buf[pixelOffset + 1] = (byte)green;
buf[pixelOffset + 2] = (byte)red;
buf[pixelOffset + 3] = (byte)alpha;
}
static void printLine(byte[] buf, pLine lineCoords, pBGRA color, int pixelWidth)
{
int stride = (pixelWidth * 32) / 8;
int pixelHeight = buf.Length / stride;
int x0 = lineCoords.x0;
int y0 = lineCoords.y0;
int x1 = lineCoords.x1;
int y1 = lineCoords.y1;
int dx = Math.Abs(x1 - x0);
int sx = x0 < x1 ? 1 : -1;
int dy = Math.Abs(y1 - y0);
int sy = y0 < y1 ? 1 : -1;
int err = (dx > dy ? dx : -dy) / 2;
int e2;
for (; ;)
{
if (!(x0 >= pixelWidth || y0 >= pixelHeight || x0 < 0 || y0 < 0))
{
printPixel(buf, x0, y0, color, pixelWidth);
}
if (x0 == x1 && y0 == y1)
{
break;
}
e2 = err;
if (e2 > -dx)
{
err -= dy;
x0 += sx;
}
if (e2 < dy)
{
err += dx;
y0 += sy;
}
}
}
static void lmoveScreen(byte[] buf, pBGRA fillColor, int moveAmt, int pixelWidth)
{
int stride = (pixelWidth * 32) / 8;
int pixelHeight = buf.Length / stride;
for (int y = 0; y < pixelHeight; y++)
{
for (int x = 0; x < pixelWidth; x++)
{
int nextPixel = x + moveAmt;
if (nextPixel < pixelWidth)
{
int pixelOffset = (nextPixel + y * pixelWidth) * 32 / 8;
printPixel(buf, x, y, new pBGRA(buf[pixelOffset], buf[pixelOffset + 1], buf[pixelOffset + 2], buf[pixelOffset + 3]), pixelWidth);
}
else
{
printPixel(buf, x, y, fillColor, pixelWidth);
}
}
}
}