/// <summary> Initialize this PixelMap from another image map.
///
/// </summary>
/// <param name="ref">image map to initialize from
///
/// </param>
/// <returns> the initialized PixelMap
/// </returns>
public virtual PixelMap Init(Map ref_Renamed)
{
Init(ref_Renamed.ImageHeight, ref_Renamed.ImageWidth, ((null)));
PixelReference pixel = CreateGPixelReference(0);
if ((ImageHeight > 0) && (ImageWidth > 0))
{
PixelReference refPixel = (ref_Renamed).CreateGPixelReference(0);
for (int y = 0; y < ImageHeight; y++)
{
pixel.SetOffset(y, 0);
refPixel.SetOffset(y, 0);
if (!IsRampNeeded)
{
for (int x = ImageWidth; x-- > 0; pixel.IncOffset(), refPixel.IncOffset())
{
pixel.CopyFrom(refPixel);
}
}
else
{
for (int x = ImageWidth; x-- > 0; pixel.IncOffset(), refPixel.IncOffset())
{
pixel.CopyFrom(ref_Renamed.PixelRamp(refPixel));
}
}
}
}
return(this);
}
/// <summary> Fills an array of pixels from the specified values.
///
/// </summary>
/// <param name="x">the x-coordinate of the upper-left corner of the region of
/// pixels
/// </param>
/// <param name="y">the y-coordinate of the upper-left corner of the region of
/// pixels
/// </param>
/// <param name="w">the width of the region of pixels
/// </param>
/// <param name="h">the height of the region of pixels
/// </param>
/// <param name="pixels">the array of pixels
/// </param>
/// <param name="off">the offset into the pixel array
/// </param>
/// <param name="scansize">the distance from one row of pixels to the next in the
/// array
/// </param>
public void FillRgbPixels(int x, int y, int w, int h, int[] pixels, int off, int scansize)
{
int yrev = _parent.ImageHeight - y;
if (!_parent.IsRampNeeded)
{
for (int y0 = yrev; y0-- > (yrev - h); off += scansize)
{
for (int i = off, j = (_parent.RowOffset(y0) + x) * _ncolors, k = w; k > 0; k--, j += _ncolors)
{
pixels[i++] = unchecked ((int)0xff000000) | (0xff0000 & (_parent.Data[j + _redOffset] << 16)) |
(0xff00 & (_parent.Data[j + _greenOffset] << 8)) |
(0xff & _parent.Data[j + _blueOffset]);
}
}
}
else
{
PixelReference ref_Renamed = _parent.CreateGPixelReference(0);
for (int y0 = yrev; y0-- > (yrev - h); off += scansize)
{
ref_Renamed.SetOffset(y0, x);
for (int i = off, k = w; k > 0; k--, ref_Renamed.IncOffset())
{
pixels[i++] = _parent.PixelRamp(ref_Renamed).GetHashCode();
}
}
}
}
/// <summary> Insert the reference map at the specified location.
///
/// </summary>
/// <param name="ref">map to insert
/// </param>
/// <param name="dx">horizontal position to insert at
/// </param>
/// <param name="dy">vertical position to insert at
/// </param>
public override void Fill(Map ref_Renamed, int dx, int dy)
{
int x0 = (dx > 0) ? dx : 0;
int y0 = (dy > 0) ? dy : 0;
int x1 = (dx < 0) ? (-dx) : 0;
int y1 = (dy < 0) ? (-dy) : 0;
int w0 = ImageWidth - x0;
int w1 = ref_Renamed.ImageWidth - x1;
int w = (w0 < w1) ? w0 : w1;
int h0 = ImageHeight - y0;
int h1 = ref_Renamed.ImageHeight - y1;
int h = (h0 < h1) ? h0 : h1;
if ((w > 0) && (h > 0))
{
PixelReference pixel = CreateGPixelReference(0);
PixelReference refPixel = ref_Renamed.CreateGPixelReference(0);
do
{
pixel.SetOffset(y0++, x0);
refPixel.SetOffset(y1++, x1);
if (!IsRampNeeded)
{
pixel.SetPixels(refPixel, w);
}
else
{
int i = w;
do
{
pixel.CopyFrom(ref_Renamed.PixelRamp(refPixel));
pixel.IncOffset();
refPixel.IncOffset();
} while (--i > 0);
}
} while (--h > 0);
}
}
/// <summary> Initialize this PixelMap from a segment of another image map.
///
/// </summary>
/// <param name="ref">image map to initialize from
/// </param>
/// <param name="rect">bounding rectangle to initialize from
///
/// </param>
/// <returns> the initialized PixelMap
/// </returns>
public virtual PixelMap Init(Map ref_Renamed, Rectangle rect)
{
Init(rect.Height, rect.Width, ((null)));
Rectangle rect2 = new Rectangle(0, 0, ref_Renamed.ImageWidth, ref_Renamed.ImageHeight);
rect2.Intersect(rect2, rect);
rect2.Translate(-rect.Right, -rect.Bottom);
if (!rect2.Empty)
{
PixelReference pixel = CreateGPixelReference(0);
PixelReference refPixel = ref_Renamed.CreateGPixelReference(0);
for (int y = rect2.Bottom; y < rect2.Top; y++)
{
pixel.SetOffset(y, rect2.Right);
refPixel.SetOffset(y + rect.Bottom, rect.Right + rect2.Right);
if (!IsRampNeeded)
{
for (int x = rect2.Left - rect2.Right; x-- > 0; pixel.IncOffset(), refPixel.IncOffset())
{
pixel.CopyFrom(refPixel);
}
}
else
{
for (int x = rect2.Left - rect2.Right; x-- > 0; pixel.IncOffset(), refPixel.IncOffset())
{
pixel.CopyFrom(ref_Renamed.PixelRamp(refPixel));
}
}
}
}
return(this);
}
private PixelReference GetLine(int fy, Rectangle required_red, Rectangle provided_input, PixelMap input)
{
if (fy < required_red.YMin)
{
fy = required_red.YMin;
}
else if (fy >= required_red.YMax)
{
fy = required_red.YMax - 1;
}
// Cached line
if (fy == l2)
{
return(p2.CreateGPixelReference(0));
}
if (fy == l1)
{
return(p1.CreateGPixelReference(0));
}
// Shift
PixelMap p = p1;
p1 = p2;
l1 = l2;
p2 = p;
l2 = fy;
// Compute location of line
Rectangle line = new Rectangle();
line.XMin = required_red.XMin << xshift;
line.XMax = required_red.XMax << xshift;
line.YMin = fy << yshift;
line.YMax = (fy + 1) << yshift;
line.Intersect(line, provided_input);
line.Translate(-provided_input.XMin, -provided_input.YMin);
// Prepare variables
int botline = input.RowOffset(line.YMin);
int rowsize = input.GetRowSize();
int sw = 1 << xshift;
int div = xshift + yshift;
int rnd = 1 << (div - 1);
int rnd2 = rnd + rnd;
PixelReference inp1 = input.CreateGPixelReference(0);
PixelReference ip = p.CreateGPixelReference(0);
// Compute averages
for (int x = line.XMin; x < line.XMax; x += sw, ip.IncOffset())
{
int r = 0;
int g = 0;
int b = 0;
int s = 0;
int inp0 = botline + x;
int sy2 = line.Height;
int sy1 = (1 << yshift);
if (sy1 > sy2)
{
sy1 = sy2;
}
for (int sy = 0; sy < sy1; sy++, inp0 += rowsize)
{
int sx1 = x + sw;
inp1.SetOffset(inp0);
if (sx1 > line.XMax)
{
sx1 = line.XMax;
}
for (int sx = sx1 - x; sx-- > 0; s++, inp1.IncOffset())
{
r += inp1.Red;
g += inp1.Green;
b += inp1.Blue;
}
}
if (s == rnd2)
{
ip.SetBGR((b + rnd) >> div, (g + r) >> div, (r + rnd) >> div);
}
else
{
ip.SetBGR((b + (s / 2)) / 2, (g + (s / 2)) / s, (r + (s / 2)) / s);
}
}
// Return
return(p2.CreateGPixelReference(0));
}
/// <summary> Draw the foreground layer onto this background image.
///
/// </summary>
/// <param name="mask">the mask layer
/// </param>
/// <param name="foregroundMap">the foreground colors
/// </param>
/// <param name="supersample">rate to upsample the foreground colors
/// </param>
/// <param name="subsample">rate to subsample the foreground colors
/// </param>
/// <param name="bounds">the target rectangle
/// </param>
/// <param name="gamma">color correction factor
///
/// </param>
/// <throws> IllegalArgumentException if the specified bounds are not contained in the page </throws>
public virtual void Stencil(Bitmap mask, PixelMap foregroundMap, int supersample, int subsample, Rectangle bounds,
double gamma)
{
// Check arguments
Rectangle rect = new Rectangle(0, 0, (foregroundMap.ImageWidth * supersample + subsample - 1) / subsample,
(foregroundMap.ImageHeight * supersample + subsample - 1) / subsample);
if (bounds != null)
{
if ((bounds.Right < rect.Right) || (bounds.Bottom < rect.Bottom) || (bounds.Left > rect.Left) ||
(bounds.Top > rect.Top))
{
throw new ArgumentException("rectangle out of bounds" + "bounds=(" + bounds.Right + "," + bounds.Bottom +
"," + bounds.Left + "," + bounds.Top + "),rect=(" + rect.Right + "," +
rect.Bottom + "," + rect.Left + "," + rect.Top + ")");
}
rect = bounds;
}
// Compute number of rows
int xrows = ImageHeight;
if (mask.ImageHeight < xrows)
{
xrows = mask.ImageHeight;
}
if (rect.Height < xrows)
{
xrows = rect.Height;
}
// Compute number of columns
int xcolumns = ImageWidth;
if (mask.ImageWidth < xcolumns)
{
xcolumns = mask.ImageWidth;
}
if (rect.Width < xcolumns)
{
xcolumns = rect.Width;
}
// Precompute multiplier map
int maxgray = mask.Grays - 1;
int[] multiplier = new int[maxgray];
for (int i = 1; i < maxgray; i++)
{
multiplier[i] = (0x10000 * i) / maxgray;
}
// Prepare color correction table
int[] gtable = GetColorCorrection(gamma);
double ratioFg = supersample / (double)subsample;
// Compute starting point in blown up foreground PixelMap
int fgy = (rect.Bottom * subsample) / supersample;
double fgy1 = rect.Bottom - ratioFg * fgy;
if (fgy1 < 0)
{
fgy--;
fgy1 += ratioFg;
}
int fgxz = (rect.Right * subsample) / supersample;
double fgx1z = rect.Right - ratioFg * fgxz;
if (fgx1z < 0)
{
fgxz--;
fgx1z += ratioFg;
}
int fg = foregroundMap.RowOffset(fgy);
PixelReference fgx = foregroundMap.CreateGPixelReference(0);
PixelReference dst = CreateGPixelReference(0);
// Loop over rows
for (int y = 0; y < xrows; y++)
{
// Loop over columns
fgx.SetOffset(fg + fgxz);
double fgx1 = fgx1z;
dst.SetOffset(y, 0);
int src = mask.RowOffset(y);
for (int x = 0; x < xcolumns; x++, dst.IncOffset())
{
int srcpix = mask.GetByteAt(src + x);
// Perform pixel operation
if (srcpix > 0)
{
//fixed (int* gTableLocation = gtable)
{
if (srcpix >= maxgray)
{
dst.SetBGR(gtable[fgx.Blue], gtable[fgx.Green],
gtable[fgx.Red]);
}
else
{
int level = multiplier[srcpix];
dst.SetBGR(((dst.Blue * (0x10000 - level)) + (level * gtable[fgx.Blue])) >> 16,
((dst.Green * (0x10000 - level)) + (level * gtable[fgx.Green])) >> 16,
((dst.Red * (0x10000 - level)) + (level * gtable[fgx.Red])) >> 16);
}
}
}
// Next column
if (++fgx1 >= ratioFg)
{
fgx1 -= ratioFg;
fgx.IncOffset();
}
}
// Next line
if (++fgy1 >= ratioFg)
{
fgy1 -= ratioFg;
fg += foregroundMap.GetRowSize();
}
}
}
/// <summary> Fill this image from another source at reduced resolution of 4 vertical
/// pixels to 3. An extrapulating pixel averaging algorithm is used.
///
/// </summary>
/// <param name="src">image map to reduce
/// </param>
/// <param name="pdr">target bounds
///
/// </param>
/// <throws> IllegalArgumentException if the target rectangle is out of bounds </throws>
public virtual void Downsample43(Map src, Rectangle pdr)
{
int srcwidth = src.ImageWidth;
int srcheight = src.ImageHeight;
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
int destwidth = (int)Math.Ceiling(srcwidth * 0.75D);
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
int destheight = (int)Math.Ceiling(srcheight * 0.75D);
Rectangle rect = new Rectangle(0, 0, destwidth, destheight);
if (pdr != null)
{
if ((pdr.Right < rect.Right) || (pdr.Bottom < rect.Bottom) || (pdr.Left > rect.Left) || (pdr.Top > rect.Top))
{
throw new ArgumentException("rectangle out of bounds" + "pdr=(" + pdr.Right + "," + pdr.Bottom + "," +
pdr.Left + "," + pdr.Top + "),rect=(" + rect.Right + "," + rect.Bottom +
"," + rect.Left + "," + rect.Top + ")");
}
rect = pdr;
destwidth = rect.Width;
destheight = rect.Height;
}
Init(destheight, destwidth, null);
int sy = rect.Bottom / 3;
int dy = rect.Bottom - (3 * sy);
// if(dy < 0)
// {
// sy--;
// dy += 3;
// }
int sxz = rect.Right / 3;
int dxz = rect.Right - (3 * sxz);
if (dxz < 0)
{
sxz--;
dxz += 3;
}
sxz *= 4;
sy *= 4;
PixelReference spix0 = src.CreateGPixelReference(0);
PixelReference spix1 = src.CreateGPixelReference(0);
PixelReference spix2 = src.CreateGPixelReference(0);
PixelReference spix3 = src.CreateGPixelReference(0);
PixelReference dpix0 = CreateGPixelReference(0);
PixelReference dpix1 = CreateGPixelReference(0);
PixelReference dpix2 = CreateGPixelReference(0);
while (dy < destheight)
{
spix0.SetOffset(sy++, sxz);
if (sy >= srcheight)
{
sy--;
}
spix1.SetOffset(sy++, sxz);
if (sy >= srcheight)
{
sy--;
}
spix2.SetOffset(sy++, sxz);
if (sy >= srcheight)
{
sy--;
}
spix3.SetOffset(sy++, sxz);
dpix0.SetOffset((dy < 0) ? 0 : dy, dxz);
if (++dy >= destheight)
{
dy--;
}
dpix1.SetOffset((dy < 0) ? 0 : dy, dxz);
if (++dy >= destheight)
{
dy--;
}
dpix2.SetOffset(dy++, dxz);
int dx = dxz;
int sx = sxz;
Pixel pix0 = src.PixelRamp(spix0);
Pixel pix1 = src.PixelRamp(spix1);
Pixel pix2 = src.PixelRamp(spix2);
Pixel pix3 = src.PixelRamp(spix3);
while (dx < destwidth)
{
int s00b = pix0.Blue;
int s00g = pix0.Green;
int s00r = pix0.Red;
int s01b = pix1.Blue;
int s01g = pix1.Green;
int s01r = pix1.Red;
int s02b = pix2.Blue;
int s02g = pix2.Green;
int s02r = pix2.Red;
int s03b = pix3.Blue;
int s03g = pix3.Green;
int s03r = pix3.Red;
if (++sx < srcwidth)
{
spix0.IncOffset();
spix1.IncOffset();
spix2.IncOffset();
spix3.IncOffset();
pix0 = src.PixelRamp(spix0);
pix1 = src.PixelRamp(spix1);
pix2 = src.PixelRamp(spix2);
pix3 = src.PixelRamp(spix3);
}
int s10b = pix0.Blue;
int s10g = pix0.Green;
int s10r = pix0.Red;
int s11b = pix1.Blue;
int s11g = pix1.Green;
int s11r = pix1.Red;
int s12b = pix2.Blue;
int s12g = pix2.Green;
int s12r = pix2.Red;
int s13b = pix3.Blue;
int s13g = pix3.Green;
int s13r = pix3.Red;
if (++sx < srcwidth)
{
spix0.IncOffset();
spix1.IncOffset();
spix2.IncOffset();
spix3.IncOffset();
pix0 = src.PixelRamp(spix0);
pix1 = src.PixelRamp(spix1);
pix2 = src.PixelRamp(spix2);
pix3 = src.PixelRamp(spix3);
}
int s20b = pix0.Blue;
int s20g = pix0.Green;
int s20r = pix0.Red;
int s21b = pix1.Blue;
int s21g = pix1.Green;
int s21r = pix1.Red;
int s22b = pix2.Blue;
int s22g = pix2.Green;
int s22r = pix2.Red;
int s23b = pix3.Blue;
int s23g = pix3.Green;
int s23r = pix3.Red;
if (++sx < srcwidth)
{
spix0.IncOffset();
spix1.IncOffset();
spix2.IncOffset();
spix3.IncOffset();
pix0 = src.PixelRamp(spix0);
pix1 = src.PixelRamp(spix1);
pix2 = src.PixelRamp(spix2);
pix3 = src.PixelRamp(spix3);
}
int s30b = pix0.Blue;
int s30g = pix0.Green;
int s30r = pix0.Red;
int s31b = pix1.Blue;
int s31g = pix1.Green;
int s31r = pix1.Red;
int s32b = pix2.Blue;
int s32g = pix2.Green;
int s32r = pix2.Red;
int s33b = pix3.Blue;
int s33g = pix3.Green;
int s33r = pix3.Red;
if (++sx < srcwidth)
{
spix0.IncOffset();
spix1.IncOffset();
spix2.IncOffset();
spix3.IncOffset();
pix0 = src.PixelRamp(spix0);
pix1 = src.PixelRamp(spix1);
pix2 = src.PixelRamp(spix2);
pix3 = src.PixelRamp(spix3);
}
dpix0.Blue = (sbyte)(((11 * s00b) + (2 * (s01b + s10b)) + s11b + 8) >> 4);
dpix0.Green = (sbyte)(((11 * s00g) + (2 * (s01g + s10g)) + s11g + 8) >> 4);
dpix0.Red = (sbyte)(((11 * s00r) + (2 * (s01r + s10r)) + s11r + 8) >> 4);
dpix1.Blue = (sbyte)(((7 * (s01b + s02b)) + s11b + s12b + 8) >> 4);
dpix1.Green = (sbyte)(((7 * (s01g + s02g)) + s11g + s12g + 8) >> 4);
dpix1.Red = (sbyte)(((7 * (s01r + s02r)) + s11r + s12r + 8) >> 4);
dpix2.Blue = (sbyte)(((11 * s03b) + (2 * (s02b + s13b)) + s12b + 8) >> 4);
dpix2.Green = (sbyte)(((11 * s03g) + (2 * (s02g + s13g)) + s12g + 8) >> 4);
dpix2.Red = (sbyte)(((11 * s03r) + (2 * (s02r + s13r)) + s12r + 8) >> 4);
if (++dx < destwidth)
{
dpix0.IncOffset();
dpix1.IncOffset();
dpix2.IncOffset();
}
dpix0.Blue = (sbyte)(((7 * (s10b + s20b)) + s11b + s21b + 8) >> 4);
dpix0.Green = (sbyte)(((7 * (s10g + s20g)) + s11g + s21g + 8) >> 4);
dpix0.Red = (sbyte)(((7 * (s10r + s20r)) + s11r + s21r + 8) >> 4);
dpix1.Blue = (sbyte)((s12b + s22b + s11b + s21b + 2) >> 2);
dpix1.Green = (sbyte)((s12g + s22g + s11g + s21g + 2) >> 2);
dpix1.Red = (sbyte)((s12r + s22r + s11r + s21r + 2) >> 2);
dpix2.Blue = (sbyte)(((7 * (s13b + s23b)) + s12b + s22b + 8) >> 4);
dpix2.Green = (sbyte)(((7 * (s13g + s23g)) + s12g + s22g + 8) >> 4);
dpix2.Red = (sbyte)(((7 * (s13r + s23r)) + s12r + s22r + 8) >> 4);
if (++dx < destwidth)
{
dpix0.IncOffset();
dpix1.IncOffset();
dpix2.IncOffset();
}
dpix0.Blue = (sbyte)(((11 * s30b) + (2 * (s31b + s20b)) + s21b + 8) >> 4);
dpix0.Green = (sbyte)(((11 * s30g) + (2 * (s31g + s20g)) + s21g + 8) >> 4);
dpix0.Red = (sbyte)(((11 * s30r) + (2 * (s31r + s20r)) + s21r + 8) >> 4);
dpix1.Blue = (sbyte)(((7 * (s31b + s32b)) + s21b + s22b + 8) >> 4);
dpix1.Green = (sbyte)(((7 * (s31g + s32g)) + s21g + s22g + 8) >> 4);
dpix1.Red = (sbyte)(((7 * (s31r + s32r)) + s21r + s22r + 8) >> 4);
dpix2.Blue = (sbyte)(((11 * s33b) + (2 * (s32b + s23b)) + s22b + 8) >> 4);
dpix2.Green = (sbyte)(((11 * s33g) + (2 * (s32g + s23g)) + s22g + 8) >> 4);
dpix2.Red = (sbyte)(((11 * s33r) + (2 * (s32r + s23r)) + s22r + 8) >> 4);
if (++dx < destwidth)
{
dpix0.IncOffset();
dpix1.IncOffset();
dpix2.IncOffset();
}
}
}
}
/// <summary> Fill this image from another source at reduced resolution. Pixel
/// averaging will be used.
///
/// </summary>
/// <param name="src">image map to reduce
/// </param>
/// <param name="subsample">rate to subsample
/// </param>
/// <param name="pdr">target bounds
/// </param>
public virtual void Downsample(Map src, int subsample, Rectangle pdr)
{
Rectangle rect = new Rectangle(0, 0, ((src.ImageWidth + subsample) - 1) / subsample,
((src.ImageHeight + subsample) - 1) / subsample);
if (pdr != null)
{
if ((pdr.Right < rect.Right) || (pdr.Bottom < rect.Bottom) || (pdr.Left > rect.Left) || (pdr.Top > rect.Top))
{
throw new ArgumentException("Specified rectangle overflows destination PixelMap");
}
rect = pdr;
}
Init(rect.Height, rect.Width, null);
int sy = rect.Bottom * subsample;
int sxz = rect.Right * subsample;
int sidx = src.RowOffset(sy);
int didx = 0;
PixelReference sptr = src.CreateGPixelReference(0);
PixelReference dptr = CreateGPixelReference(0);
for (int y = 0; y < ImageHeight; y++)
{
int sx = sxz;
for (int x = ImageWidth; x-- > 0; dptr.IncOffset())
{
int r = 0;
int g = 0;
int b = 0;
int s = 0;
int kidx = sidx;
int lsy = sy + subsample;
if (lsy > src.ImageHeight)
{
lsy = src.ImageHeight;
}
int lsx = sx + subsample;
if (lsx > src.ImageWidth)
{
lsx = src.ImageWidth;
}
for (int rsy = sy; rsy < lsy; rsy++)
{
sptr.SetOffset(kidx + sx);
if (!IsRampNeeded)
{
for (int rsx = lsx - sx; rsx-- > 0; sptr.IncOffset())
{
r += sptr.Red;
g += sptr.Green;
b += sptr.Blue;
s++;
}
}
else
{
for (int rsx = lsx - sx; rsx-- > 0; sptr.IncOffset())
{
Pixel pix = src.PixelRamp(sptr);
r += pix.Red;
g += pix.Green;
b += pix.Blue;
s++;
}
}
kidx += src.GetRowSize();
}
if (s >= _invmap.Length)
{
dptr.SetBGR(b / s, g / s, r / s);
}
else
{
dptr.SetBGR(((b * _invmap[s]) + 32768) >> 16, ((g * _invmap[s]) + 32768) >> 16,
((r * _invmap[s]) + 32768) >> 16);
}
sx += subsample;
}
sy += subsample;
sidx += src.RowOffset(subsample);
dptr.SetOffset(didx += GetRowSize());
}
}
/// <summary> Insert the specified bitmap with the specified color.
///
/// </summary>
/// <param name="bm">bitmap to insert
/// </param>
/// <param name="xpos">horizontal position
/// </param>
/// <param name="ypos">vertical position
/// </param>
/// <param name="color">color to insert bitmap with
/// </param>
public virtual void Blit(Bitmap bm, int xpos, int ypos, Pixel color)
{
// Check
if (color == null)
{
return;
}
// Compute number of rows and columns
int xrows = ypos + bm.ImageHeight;
if (xrows > ImageHeight)
{
xrows = ImageHeight;
}
if (ypos > 0)
{
xrows -= ypos;
}
int xcolumns = xpos + bm.ImageWidth;
if (xcolumns > ImageWidth)
{
xcolumns = ImageWidth;
}
if (xpos > 0)
{
xcolumns -= xpos;
}
if ((xrows <= 0) || (xcolumns <= 0))
{
return;
}
// Precompute multiplier map
int maxgray = bm.Grays - 1;
int[] multiplier = new int[maxgray];
for (int i = 0; i < maxgray; i++)
{
multiplier[i] = 0x10000 - ((i << 16) / maxgray);
}
// Cache target color
int gr = color.Red;
int gg = color.Green;
int gb = color.Blue;
// Compute starting point
int src = bm.RowOffset((ypos < 0) ? (-ypos) : 0) - ((xpos < 0) ? xpos : 0);
int dst = ((ypos > 0) ? RowOffset(ypos) : 0) + ((xpos > 0) ? xpos : 0);
PixelReference dstPixel = CreateGPixelReference(dst);
// Loop over rows
for (int y = 0; y < xrows; y++)
{
// Loop over columns
dstPixel.SetOffset(dst);
for (int x = 0; x < xcolumns; dstPixel.IncOffset())
{
int srcpix = bm.GetByteAt(src + (x++));
// Perform pixel operation
if (srcpix != 0)
{
if (srcpix >= maxgray)
{
dstPixel.SetBGR(gb, gg, gr);
}
else
{
int level0 = multiplier[srcpix];
int level1 = 0x10000 - level0;
dstPixel.SetBGR(_clip[((dstPixel.Blue * level0) + (gb * level1)) >> 16],
_clip[((dstPixel.Green * level0) + (gg * level1)) >> 16],
_clip[((dstPixel.Red * level0) + (gr * level1)) >> 16]);
}
}
}
// Next line
dst += GetRowSize();
src += bm.GetRowSize();
}
}
/// <summary> Attenuate the specified bitmap.
///
/// </summary>
/// <param name="bm">Bitmap to attenuate
/// </param>
/// <param name="xpos">horizontal position
/// </param>
/// <param name="ypos">vertical position
/// </param>
public virtual void Attenuate(Bitmap bm, int xpos, int ypos)
{
// Check
// Compute number of rows and columns
int xrows = ypos + bm.ImageHeight;
if (xrows > ImageHeight)
{
xrows = ImageHeight;
}
if (ypos > 0)
{
xrows -= ypos;
}
int xcolumns = xpos + bm.ImageWidth;
if (xcolumns > ImageWidth)
{
xcolumns = ImageWidth;
}
if (xpos > 0)
{
xcolumns -= xpos;
}
if ((xrows <= 0) || (xcolumns <= 0))
{
return;
}
// Precompute multiplier map
int maxgray = bm.Grays - 1;
int[] multiplier = GetMultiplier(maxgray);
// Compute starting point
int src = bm.RowOffset((ypos < 0) ? (-ypos) : 0) - ((xpos < 0) ? xpos : 0);
int dst = RowOffset((ypos > 0) ? ypos : 0) + ((xpos > 0) ? xpos : 0);
PixelReference dstPixel = CreateGPixelReference(0);
// Loop over rows
for (int y = 0; y < xrows; y++)
{
// Loop over columns
dstPixel.SetOffset(dst);
for (int x = 0; x < xcolumns; dstPixel.IncOffset())
{
int srcpix = bm.GetByteAt(src + (x++));
// Perform pixel operation
if (srcpix > 0)
{
if (srcpix >= maxgray)
{
dstPixel.SetGray(0);
}
else
{
int level = multiplier[srcpix];
dstPixel.SetBGR((dstPixel.Blue * level) >> 16, (dstPixel.Green * level) >> 16,
(dstPixel.Red * level) >> 16);
}
}
}
// Next line
dst += GetRowSize();
src += bm.GetRowSize();
}
}