public override void RoomChanged(Room room)
{
var roomPtr = room.Image.Data;
_roomStrips = GenerateStripTable(roomPtr,
room.Header.Width, room.Header.Height);
}
/// <summary>
/// Create and fill a table with offsets to the graphic and mask strips in the
/// given V2 EGA bitmap.
/// </summary>
/// <returns>The filled strip table.</returns>
/// <param name="src">The V2 EGA bitmap.</param>
/// <param name="width">The width of the bitmap.</param>
/// <param name="height">The height of the bitmap.</param>
StripTable GenerateStripTable(byte[] src, int width, int height)
{
int srcPos = 0;
var table = new StripTable();
byte color = 0, data = 0;
int x, y, length = 0;
byte run = 1;
// Decode the graphics strips, and memorize the run/color values
// as well as the byte offset.
for (x = 0; x < width; x++)
{
if ((x % 8) == 0)
{
Debug.Assert(x / 8 < 160);
table.run[x / 8] = run;
table.color[x / 8] = color;
table.offsets[x / 8] = srcPos;
}
for (y = 0; y < height; y++)
{
if (--run == 0)
{
data = src[srcPos++];
if ((data & 0x80) != 0)
{
run = (byte)(data & 0x7f);
}
else
{
run = (byte)(data >> 4);
}
if (run == 0)
{
run = src[srcPos++];
}
color = (byte)(data & 0x0f);
}
}
}
// The mask data follows immediately after the graphics.
x = 0;
y = height;
width /= 8;
for (;;)
{
length = src[srcPos++];
byte runFlag = (byte)(length & 0x80);
if (runFlag != 0)
{
length &= 0x7f;
data = src[srcPos++];
}
do
{
if (runFlag == 0)
{
data = src[srcPos++];
}
if (y == height)
{
Debug.Assert(x < 120);
table.zoffsets[x] = srcPos - 1;
table.zrun[x] = length | runFlag;
}
if (--y == 0)
{
if (--width == 0)
{
return(table);
}
x++;
y = height;
}
} while ((--length) != 0);
}
}
/// <summary>
/// Create and fill a table with offsets to the graphic and mask strips in the
/// given V2 EGA bitmap.
/// </summary>
/// <returns>The filled strip table.</returns>
/// <param name="src">The V2 EGA bitmap.</param>
/// <param name="width">The width of the bitmap.</param>
/// <param name="height">The height of the bitmap.</param>
StripTable GenerateStripTable(byte[] src, int width, int height)
{
int srcPos = 0;
var table = new StripTable();
byte color = 0, data = 0;
int x, y, length = 0;
byte run = 1;
// Decode the graphics strips, and memorize the run/color values
// as well as the byte offset.
for (x = 0; x < width; x++)
{
if ((x % 8) == 0)
{
Debug.Assert(x / 8 < 160);
table.run[x / 8] = run;
table.color[x / 8] = color;
table.offsets[x / 8] = srcPos;
}
for (y = 0; y < height; y++)
{
if (--run == 0)
{
data = src[srcPos++];
if ((data & 0x80) != 0)
{
run = (byte)(data & 0x7f);
}
else
{
run = (byte)(data >> 4);
}
if (run == 0)
{
run = src[srcPos++];
}
color = (byte)(data & 0x0f);
}
}
}
// The mask data follows immediately after the graphics.
x = 0;
y = height;
width /= 8;
for (;;)
{
length = src[srcPos++];
byte runFlag = (byte)(length & 0x80);
if (runFlag != 0)
{
length &= 0x7f;
data = src[srcPos++];
}
do
{
if (runFlag == 0)
data = src[srcPos++];
if (y == height)
{
Debug.Assert(x < 120);
table.zoffsets[x] = srcPos - 1;
table.zrun[x] = length | runFlag;
}
if (--y == 0)
{
if (--width == 0)
return table;
x++;
y = height;
}
} while ((--length) != 0);
}
}
public override void RoomChanged(Room room)
{
var roomPtr = room.Image.Data;
_roomStrips = GenerateStripTable(roomPtr,
room.Header.Width, room.Header.Height);
}
