static byte[] Capture(VirtScreen screen, int x, int y, int w, int h)
{
var pixels = new byte[w * h];
var nav = new PixelNavigator(screen.Surfaces[0]);
nav.GoTo(x, y);
for (int height = 0; height < h; height++)
{
for (int width = 0; width < w; width++)
{
pixels[height * w + width] = nav.Read();
nav.OffsetX(1);
}
nav.Offset(-w, 1);
}
return(pixels);
}
/// <summary>
/// Blit the specified rectangle from the given virtual screen to the display.
/// Note: t and b are in *virtual screen* coordinates, while x is relative to
/// the *real screen*. This is due to the way tdirty/vdirty work: they are
/// arrays which map 'strips' (sections of the real screen) to dirty areas as
/// specified by top/bottom coordinate in the virtual screen.
/// </summary>
/// <param name="vs"></param>
/// <param name="x"></param>
/// <param name="width"></param>
/// <param name="top"></param>
/// <param name="bottom"></param>
void DrawStripToScreen(VirtScreen vs, int x, int width, int top, int bottom)
{
// Short-circuit if nothing has to be drawn
if (bottom <= top || top >= vs.Height)
{
return;
}
// Perform some clipping
if (width > vs.Width - x)
{
width = vs.Width - x;
}
if (top < ScreenTop)
{
top = ScreenTop;
}
if (bottom > ScreenTop + ScreenHeight)
{
bottom = ScreenTop + ScreenHeight;
}
// Convert the vertical coordinates to real screen coords
int y = vs.TopLine + top - ScreenTop;
int height = bottom - top;
if (width <= 0 || height <= 0)
{
return;
}
byte[] src;
if (Game.Version < 7)
{
if (Game.Platform == Platform.FMTowns)
{
TownsDrawStripToScreen(vs, x, y, x, top, width, height);
return;
}
var srcNav = new PixelNavigator(vs.Surfaces[0]);
srcNav.GoTo(vs.XStart + x, top);
var compNav = new PixelNavigator(_composite);
var txtNav = new PixelNavigator(_textSurface);
int m = _textSurfaceMultiplier;
txtNav.GoTo(x * m, y * m);
var vsPitch = vs.Pitch - width * vs.BytesPerPixel;
var textPitch = _textSurface.Pitch - width * m;
for (int h = height * m; h > 0; --h)
{
for (int w = width * m; w > 0; w--)
{
var temp = txtNav.Read();
int mask = temp ^ CharsetMaskTransparency;
mask = (((mask & 0x7f) + 0x7f) | mask) & 0x80;
mask = ((mask >> 7) + 0x7f) ^ 0x80;
var dst = ((temp ^ srcNav.Read()) & mask) ^ temp;
compNav.Write((byte)dst);
srcNav.OffsetX(1);
txtNav.OffsetX(1);
compNav.OffsetX(1);
}
srcNav.OffsetX(vsPitch);
txtNav.OffsetX(textPitch);
}
src = _composite.Pixels;
}
else
{
src = new byte[width * height * vs.BytesPerPixel];
var srcNav = new PixelNavigator(vs.Surfaces[0]);
srcNav.GoTo(vs.XStart + x, top);
for (int h = 0; h < height; h++)
{
for (int w = 0; w < width; w++)
{
src[h * width + w] = srcNav.Read();
srcNav.OffsetX(1);
}
srcNav.Offset(-width, 1);
}
}
// Finally blit the whole thing to the screen
_gfxManager.CopyRectToScreen(src, width * vs.BytesPerPixel, x, y, width, height);
}