static private void WriteColorDiff2(CBitWriter writer, ref Color color, Color next, ref int dg, int alpha)
{
int r = color.R;
int g = color.G;
int b = color.B;
int t = g + (dg * 2);
if (t > 255)
{
t = 255;
}
else if (t < 0)
{
t = 0;
}
t -= g;
if (t < -128)
{
t += 256;
}
if (t > 127)
{
t -= 256;
}
dg = (int)((next.G - color.G) / 2);
if (dg < -128)
{
dg = -128;
}
if (dg > 127)
{
dg = 127;
}
r += (dg * 2);
g += (dg * 2);
b += (dg * 2);
if (r > 255)
{
r = 255;
}
if (g > 255)
{
g = 255;
}
if (b > 255)
{
b = 255;
}
if (r < 0)
{
r = 0;
}
if (g < 0)
{
g = 0;
}
if (b < 0)
{
b = 0;
}
int dr2 = (next.R - r) / 2;
int db2 = (next.B - b) / 2;
if (dr2 < -128)
{
dr2 = -128;
}
if (dr2 > 127)
{
dr2 = 127;
}
if (db2 < -128)
{
db2 = -128;
}
if (db2 > 127)
{
db2 = 127;
}
r += (dr2 * 2);
b += (db2 * 2);
if (r > 255)
{
r = 255;
}
if (b > 255)
{
b = 255;
}
if (r < 0)
{
r = 0;
}
if (b < 0)
{
b = 0;
}
writer.Write((sbyte)(dg - (t / 2)));
writer.Write((sbyte)db2);
writer.Write((sbyte)dr2);
color = Color.FromArgb(alpha, r & 0xFE, g & 0xFE, b & 0xFE);
}
/**
* Transparent images
*/
static public void WriteTransparent(Bitmap bitmap, CBitWriter writer, Int16 width, Int16 height)
{
Color[] widthBuffer = new Color[width];
// Every row
for (int y = 0; y < height; y++)
{
int x = 0;
Color color = Color.FromArgb(0, 0, 0, 0);
int alphaRepetition = 0;
int ta = 0;
int a = 0;
int tempa = 0;
int n = 0;
int dg = 0;
int frameRepetition = 0;
bool repetition = true;
UInt16 count = 0;
while (x < width)
{
// ALPHA CHANNEL STUFF
if (--alphaRepetition < 0)
{
ta = (int)Math.Round(bitmap.GetPixel(x, y).A * 0.125, 0);
ta -= (int)Math.Round(color.A * 0.125, 0);
a = FixAlpha(bitmap.GetPixel(x, y).A);
color = Color.FromArgb(a, color.R, color.G, color.B);
writer.Write((sbyte)ta);
if (a == 0)
{
n = 0;
tempa = 0;
widthBuffer[x++] = Color.FromArgb(0, 0, 0, 0);
while (x < width)
{
tempa = FixAlpha(bitmap.GetPixel(x, y).A);
if (tempa != 0)
{
break;
}
n++;
widthBuffer[x++] = Color.FromArgb(0, 0, 0, 0);
}
writer.Write((UInt16)n);
continue;
}
if (a == 255)
{
n = 0;
tempa = 0;
int x2 = x + 1;
while (x2 < width)
{
tempa = FixAlpha(bitmap.GetPixel(x2, y).A);
if (tempa != 255)
{
break;
}
n++;
x2++;
}
writer.Write((UInt16)n);
alphaRepetition = n;
}
}
// FRAME REPETITION
if (--frameRepetition < 0)
{
repetition = !repetition;
dg = 0;
if (repetition)
{
writer.Write((UInt16)(count - 1));
frameRepetition = count - 1;
}
else
{
frameRepetition = FindNextRepetition2(bitmap, x, y, width, ref count);
writer.Write((UInt16)frameRepetition);
}
}
// MAIN PART
if (repetition)
{
if (alphaRepetition < frameRepetition)
{
widthBuffer[x++] = color;
}
// All repeated frames have the same alpha
else
{
if (frameRepetition > 0)
{
alphaRepetition -= frameRepetition;
}
for (int i = 0; i < (frameRepetition + 1); i++)
{
widthBuffer[x++] = color;
}
frameRepetition = 0;
}
}
else
{
// If this pixel is the same as the one in previous row - copy its RGBs
if (y > 0 && widthBuffer[x].R == bitmap.GetPixel(x, y).R&& widthBuffer[x].G == bitmap.GetPixel(x, y).G&& widthBuffer[x].B == bitmap.GetPixel(x, y).B)
{
writer.Write(true);
dg = 0;
widthBuffer[x] = Color.FromArgb(color.A, widthBuffer[x].R, widthBuffer[x].G, widthBuffer[x].B);
color = widthBuffer[x++];
}
// Otherwise write color difference and transform our current color
else
{
writer.Write(false);
WriteColorDiff2(writer, ref color, bitmap.GetPixel(x, y), ref dg, color.A);
widthBuffer[x++] = color;
}
}
}
}
}
/**
* 1 opaque version
*/
static public void WriteOpaque1(Bitmap bitmap, CBitWriter writer, Int16 width, Int16 height)
{
Color[] widthBuffer = new Color[width];
// Every row
for (int y = 0; y < height; y++)
{
// Clear stuff
int x = 0;
int repetition = -1;
UInt16 n = 0;
Color color = Color.FromArgb(0, 0, 0);
int dr = 0;
int dg = 0;
int db = 0;
// Every column
while (x < width)
{
// Find next duplicated pixels in this row (n is count of the pixels, repetition is relative location)
if (repetition == -1)
{
repetition = FindNextRepetition(bitmap, x, y, width, ref n);
writer.Write((UInt16)repetition);
}
// If this pixel is the same as the one in previous row - copy its RGBs
if (y > 0 && widthBuffer[x] == bitmap.GetPixel(x, y))
{
writer.Write(true);
dr = dg = db = 0;
color = widthBuffer[x];
}
// Otherwise write color difference and transform our current color
else
{
writer.Write(false);
WriteColorDiff(writer, ref color, bitmap.GetPixel(x, y), ref dr, ref dg, ref db);
}
widthBuffer[x++] = color;
// Process repetition
if (repetition-- == 0 && x < width)
{
if (n == 0)
{
writer.Write((byte)0);
widthBuffer[x++] = color;
}
else
{
writer.Write((UInt16)(n - 1));
for (int i = 0; i < n; i++)
{
widthBuffer[x++] = color;
}
}
dr = dg = db = 0;
}
}
}
}