public void Scale(Rectangle provided_input, PixelMap sourceMap, Rectangle targetRect, PixelMap output)
{
// Compute rectangles
Rectangle required_red = new Rectangle();
Rectangle sourceRect = CreateRectangles(targetRect, required_red);
// Parameter validation
if (
(provided_input.Width != sourceMap.ImageWidth) ||
(provided_input.Height != sourceMap.ImageHeight))
{
throw new Exception("invalid rectangle");
}
if (
(provided_input.XMin > sourceRect.XMin) ||
(provided_input.YMin > sourceRect.YMin) ||
(provided_input.XMax < sourceRect.XMax) ||
(provided_input.YMax < sourceRect.YMax))
{
throw new Exception("invalid rectangle");
}
// Adjust output pixmap
if (
(targetRect.Width != (int)output.ImageWidth) ||
(targetRect.Height != (int)output.ImageHeight))
{
output.Init(
targetRect.Height,
targetRect.Width,
null);
}
// Prepare temp stuff
int bufw = required_red.Width;
Pixel[] lbuffer = new Pixel[bufw + 2];
for (int i = 0; i < lbuffer.Length;)
{
lbuffer[i++] = new Pixel();
}
try
{
if ((xshift > 0) || (yshift > 0))
{
p1 = new PixelMap().Init(1, bufw, null);
p2 = new PixelMap().Init(2, bufw, null);
l1 = l2 = -1;
}
// Loop on output lines
for (int y = targetRect.YMin; y < targetRect.YMax; y++)
{
// Perform vertical interpolation
{
int fy = vcoord[y];
int fy1 = fy >> FRACBITS;
int fy2 = fy1 + 1;
PixelReference upper;
PixelReference lower;
// Obtain upper and lower line in reduced image
if ((xshift > 0) || (yshift > 0))
{
lower = GetLine(fy1, required_red, provided_input, sourceMap);
upper = GetLine(fy2, required_red, provided_input, sourceMap);
}
else
{
int dx = required_red.XMin - provided_input.XMin;
if (required_red.YMin > fy1)
{
fy1 = required_red.YMin;
}
if (required_red.YMax <= fy2)
{
fy2 = required_red.YMax - 1;
}
lower =
sourceMap.CreateGPixelReference(fy1 - provided_input.YMin, dx);
upper =
sourceMap.CreateGPixelReference(fy2 - provided_input.YMin, dx);
}
// Compute line
int idest = 1;
short[] deltas = interp[fy & FRACMASK];
for (
int edest = idest + bufw;
idest < edest;
upper.IncOffset(), lower.IncOffset())
{
Pixel dest = lbuffer[idest++];
int lower_r = lower.Red;
int delta_r = deltas[(256 + upper.Red) - lower_r];
int lower_g = lower.Green;
int delta_g = deltas[(256 + upper.Green) - lower_g];
int lower_b = lower.Blue;
int delta_b = deltas[(256 + upper.Blue) - lower_b];
dest.SetBGR(lower_b + delta_b, lower_g + delta_g, lower_r + delta_r);
}
}
// Perform horizontal interpolation
{
// Prepare for side effects
lbuffer[0] = lbuffer[1];
// lbuffer[bufw] = lbuffer[bufw];
int line = 1 - required_red.XMin;
PixelReference dest =
output.CreateGPixelReference(y - targetRect.YMin, 0);
// Loop horizontally
for (int x = targetRect.XMin; x < targetRect.XMax; x++)
{
int n = hcoord[x];
int lower = line + (n >> FRACBITS);
Pixel lower0 = lbuffer[lower];
Pixel lower1 = lbuffer[lower + 1];
short[] deltas = interp[n & FRACMASK];
int lower_r = lower0.Red;
int delta_r = deltas[(256 + lower1.Red) - lower_r];
int lower_g = lower0.Green;
int delta_g = deltas[(256 + lower1.Green) - lower_g];
int lower_b = lower0.Blue;
int delta_b = deltas[(256 + lower1.Blue) - lower_b];
dest.SetBGR(lower_b + delta_b, lower_g + delta_g, lower_r + delta_r);
dest.IncOffset();
}
}
}
}
finally
{
p1 = null;
p2 = null;
}
}
public void Scale(Rectangle srcRect, IPixelMap srcMap, Rectangle targetRect, IPixelMap targetMap)
{
// Parameter validation
if ((srcRect.Width != srcMap.Width) || (srcRect.Height != srcMap.Height))
{
throw new DjvuArgumentException("Invalid rectangle", nameof(srcRect));
}
// Compute rectangles
Rectangle required_red = new Rectangle();
Rectangle sourceRect = CreateRectangles(targetRect, required_red);
if ((srcRect.XMin > sourceRect.XMin) || (srcRect.YMin > sourceRect.YMin) ||
(srcRect.XMax < sourceRect.XMax) || (srcRect.YMax < sourceRect.YMax))
{
throw new DjvuArgumentException("Invalid rectangle", nameof(srcRect));
}
// Adjust output pixmap
if ((targetRect.Width != (int)targetMap.Width) || (targetRect.Height != (int)targetMap.Height))
{
targetMap.Init(targetRect.Height, targetRect.Width, null);
}
// Prepare temp stuff
int bufw = required_red.Width;
Pixel[] lbuffer = new Pixel[bufw + 2];
try
{
if ((_XShift > 0) || (_YShift > 0))
{
_PixelMap1 = new PixelMap().Init(1, bufw, null);
_PixelMap2 = new PixelMap().Init(2, bufw, null);
_L1 = _L2 = -1;
}
IPixelReference upper = srcMap.CreateGPixelReference(0, 0);
IPixelReference lower = srcMap.CreateGPixelReference(0, 0);
IPixelReference dest = targetMap.CreateGPixelReference(0, 0);
// Loop on output lines
for (int y = targetRect.YMin; y < targetRect.YMax; y++)
{
// Perform vertical interpolation
{
int fy = _VCoord[y];
int fy1 = fy >> FRACBITS;
int fy2 = fy1 + 1;
// Obtain upper and lower line in reduced image
if ((_XShift > 0) || (_YShift > 0))
{
lower = GetLine(fy1, required_red, srcRect, srcMap);
upper = GetLine(fy2, required_red, srcRect, srcMap);
}
else
{
int dx = required_red.XMin - srcRect.XMin;
if (required_red.YMin > fy1)
{
fy1 = required_red.YMin;
}
if (required_red.YMax <= fy2)
{
fy2 = required_red.YMax - 1;
}
lower.SetOffset(fy1 - srcRect.YMin, dx);
// srcMap.CreateGPixelReference(fy1 - srcRect.YMin, dx);
upper.SetOffset(fy2 - srcRect.YMin, dx);
// srcMap.CreateGPixelReference(fy2 - srcRect.YMin, dx);
}
// Compute line
int idest = 1;
short[] deltas = interp[fy & FRACMASK];
unsafe
{
for (int edest = idest + bufw; idest < edest; upper.IncOffset(), lower.IncOffset())
{
Pixel destPix = lbuffer[idest++];
int color = 0;
sbyte *colorPtr = (sbyte *)&color;
// Skip alpha and set pointer to Blue
colorPtr++;
*colorPtr = lower.Blue;
*colorPtr += (sbyte)deltas[(256 + upper.Blue) - *colorPtr];
// Set pointer to Green
colorPtr++;
*colorPtr = lower.Green;
*colorPtr += (sbyte)deltas[(256 + upper.Green) - *colorPtr];
// Set pointer to Red
colorPtr++;
*colorPtr = lower.Red;
*colorPtr += (sbyte)deltas[(256 + upper.Red) - *colorPtr];
//Pixel d = (Pixel) lower.ToPixel();
//destPix.SetBGR(d);
destPix.SetBGR(*colorPtr);
}
}
}
// Perform horizontal interpolation
{
// Prepare for side effects
lbuffer[0] = lbuffer[1];
// lbuffer[bufw] = lbuffer[bufw];
int line = 1 - required_red.XMin;
dest.SetOffset(y - targetRect.YMin, 0);
//= targetMap.CreateGPixelReference(y - targetRect.YMin, 0);
// Loop horizontally
unsafe
{
for (int x = targetRect.XMin; x < targetRect.XMax; x++)
{
int n = _HCoord[x];
int lowerl = line + (n >> FRACBITS);
Pixel lower0 = lbuffer[lowerl];
Pixel lower1 = lbuffer[lowerl + 1];
short[] deltas = interp[n & FRACMASK];
int color = 0;
sbyte *colorPtr = (sbyte *)&color;
// Skip alpha and set pointer to Blue
colorPtr++;
*colorPtr = lower0.Blue;
*colorPtr += (sbyte)deltas[(256 + lower1.Blue) - *colorPtr];
// Set pointer to Green
colorPtr++;
*colorPtr = lower0.Green;
*colorPtr += (sbyte)deltas[(256 + lower1.Green) - *colorPtr];
// Set pointer to Red
colorPtr++;
*colorPtr = lower0.Red;
*colorPtr += (sbyte)deltas[(256 + lower1.Red) - *colorPtr];
dest.SetBGR(*colorPtr);
dest.IncOffset();
}
}
}
}
}
finally
{
_PixelMap1 = null;
_PixelMap2 = null;
}
}