//--------------------------------------------------------------------
public byte pixel(int x, int y)
{
int bufferIndex = m_rbuf.GetBufferOffsetXY(x, y);
byte[] buffer = m_rbuf.GetBuffer();
return(buffer[bufferIndex]);
}
byte[] GetPixels(out int bufferByteOffset)
{
int x = m_x;
int y = m_y;
unchecked
{
if ((uint)x >= (uint)m_src_width)
{
if (x < 0)
{
x = 0;
}
else
{
x = (int)m_src_width - 1;
}
}
if ((uint)y >= (uint)m_src_height)
{
if (y < 0)
{
y = 0;
}
else
{
y = (int)m_src_height - 1;
}
}
}
bufferByteOffset = imgRW.GetBufferOffsetXY(x, y);
return(imgRW.GetBuffer());
}
//--------------------------------------------------------------------
public byte pixel(int x, int y)
{
unchecked
{
if ((uint)x < (uint)m_rbuf.Width &&
(uint)y < (uint)m_rbuf.Height)
{
int bufferIndex = m_rbuf.GetBufferOffsetXY(x, y);
byte[] buffer = m_rbuf.GetBuffer();
return(buffer[bufferIndex]);
}
}
return(0);
}
public void RenderScanline(
IImageReaderWriter dest,
ScanlineRasterizer sclineRas,
Scanline scline,
Color color)
{
#if DEBUG
int dbugMinScanlineCount = 0;
#endif
//1. ensure single line buffer width
_grayScaleLine.EnsureLineStride(dest.Width + 4);
//2. setup vars
byte[] dest_buffer = dest.GetBuffer();
int dest_w = dest.Width;
int dest_h = dest.Height;
int dest_stride = dest.Stride;
int src_w = dest_w;
int src_stride = dest_stride;
//*** set color before call Blend()
this._color = color;
byte color_alpha = color.alpha;
//---------------------------
//3. loop, render single scanline with subpixel rendering
byte[] lineBuff = _grayScaleLine.GetInternalBuffer();
while (sclineRas.SweepScanline(scline))
{
//3.1. clear
_grayScaleLine.Clear();
//3.2. write grayscale span to temp buffer
//3.3 convert to subpixel value and write to dest buffer
//render solid single scanline
int num_spans = scline.SpanCount;
byte[] covers = scline.GetCovers();
//render each span in the scanline
for (int i = 1; i <= num_spans; ++i)
{
ScanlineSpan span = scline.GetSpan(i);
if (span.len > 0)
{
//positive len
_grayScaleLine.SubPixBlendSolidHSpan(span.x, span.len, color_alpha, covers, span.cover_index);
}
else
{
//fill the line, same coverage area
int x = span.x;
int x2 = (x - span.len - 1);
_grayScaleLine.SubPixBlendHL(x, x2, color_alpha, covers[span.cover_index]);
}
}
BlendScanline(dest_buffer, dest_stride, scline.Y, src_w, src_stride, lineBuff);
#if DEBUG
dbugMinScanlineCount++;
#endif
}
}
void Attach(IImageReaderWriter imgRW)
{
this.imgRW = imgRW;
m_buffer = imgRW.GetBuffer();
m_src_width = imgRW.Width;
m_src_height = imgRW.Height;
m_distanceBetweenPixelsInclusive = imgRW.BytesBetweenPixelsInclusive;
}
void Attach(IImageReaderWriter imgRW)
{
this.imgRW = imgRW;
m_buffer = imgRW.GetBuffer();
m_src_width = imgRW.Width;
m_src_height = imgRW.Height;
m_distanceBetweenPixelsInclusive = imgRW.BytesBetweenPixelsInclusive;
}
int bufferOffset; // the beggining of the image in this buffer
public ChildImage(IImageReaderWriter image,
int bufferOffsetToFirstPixel,
int width,
int height)
{
SetRecieveBlender(image.GetRecieveBlender());
AttachBuffer(image.GetBuffer(),
bufferOffsetToFirstPixel,
width,
height,
image.Stride,
image.BitDepth,
image.BytesBetweenPixelsInclusive);
}
int bufferOffset; // the beggining of the image in this buffer
public ChildImage(IImageReaderWriter image,
int bufferOffsetToFirstPixel,
int width,
int height)
{
SetRecieveBlender(image.GetRecieveBlender());
AttachBuffer(image.GetBuffer(),
bufferOffsetToFirstPixel,
width,
height,
image.Stride,
image.BitDepth,
image.BytesBetweenPixelsInclusive);
}
void Attach(IImageReaderWriter sourceImage,
IPixelBlender recieveBlender,
int distanceBetweenPixelsInclusive,
int bufferOffset,
int bitsPerPixel)
{
SetDimmensionAndFormat(sourceImage.Width,
sourceImage.Height,
sourceImage.Stride,
bitsPerPixel,
distanceBetweenPixelsInclusive);
int offset = sourceImage.GetBufferOffsetXY(0, 0);
byte[] buffer = sourceImage.GetBuffer();
SetBuffer(buffer, offset + bufferOffset);
SetRecieveBlender(recieveBlender);
}
bool Attach(IImageReaderWriter sourceImage, int x1, int y1, int x2, int y2)
{
m_ByteBuffer = null;
if (x1 > x2 || y1 > y2)
{
throw new Exception("You need to have your x1 and y1 be the lower left corner of your sub image.");
}
RectInt boundsRect = new RectInt(x1, y1, x2, y2);
if (boundsRect.Clip(new RectInt(0, 0, (int)sourceImage.Width - 1, (int)sourceImage.Height - 1)))
{
SetDimmensionAndFormat(boundsRect.Width, boundsRect.Height, sourceImage.Stride, sourceImage.BitDepth, sourceImage.BytesBetweenPixelsInclusive);
int bufferOffset = sourceImage.GetBufferOffsetXY(boundsRect.Left, boundsRect.Bottom);
byte[] buffer = sourceImage.GetBuffer();
SetBuffer(buffer, bufferOffset);
return(true);
}
return(false);
}
void CopyFromNoClipping(IImageReaderWriter sourceImage, RectInt clippedSourceImageRect, int destXOffset, int destYOffset)
{
if (BytesBetweenPixelsInclusive != BitDepth / 8 ||
sourceImage.BytesBetweenPixelsInclusive != sourceImage.BitDepth / 8)
{
throw new Exception("WIP we only support packed pixel formats at this time.");
}
if (BitDepth == sourceImage.BitDepth)
{
int lengthInBytes = clippedSourceImageRect.Width * BytesBetweenPixelsInclusive;
int sourceOffset = sourceImage.GetBufferOffsetXY(clippedSourceImageRect.Left, clippedSourceImageRect.Bottom);
byte[] sourceBuffer = sourceImage.GetBuffer();
byte[] destBuffer = GetBuffer();
int destOffset = GetBufferOffsetXY(clippedSourceImageRect.Left + destXOffset, clippedSourceImageRect.Bottom + destYOffset);
for (int i = 0; i < clippedSourceImageRect.Height; i++)
{
AggMemMx.memmove(destBuffer, destOffset, sourceBuffer, sourceOffset, lengthInBytes);
sourceOffset += sourceImage.Stride;
destOffset += Stride;
}
}
else
{
bool haveConversion = true;
switch (sourceImage.BitDepth)
{
case 24:
switch (BitDepth)
{
case 32:
{
int numPixelsToCopy = clippedSourceImageRect.Width;
for (int i = clippedSourceImageRect.Bottom; i < clippedSourceImageRect.Top; i++)
{
int sourceOffset = sourceImage.GetBufferOffsetXY(clippedSourceImageRect.Left, clippedSourceImageRect.Bottom + i);
byte[] sourceBuffer = sourceImage.GetBuffer();
byte[] destBuffer = GetBuffer();
int destOffset = GetBufferOffsetXY(clippedSourceImageRect.Left + destXOffset,
clippedSourceImageRect.Bottom + i + destYOffset);
for (int x = 0; x < numPixelsToCopy; x++)
{
destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
destBuffer[destOffset++] = 255;
}
}
}
break;
default:
haveConversion = false;
break;
}
break;
default:
haveConversion = false;
break;
}
if (!haveConversion)
{
throw new NotImplementedException("You need to write the " + sourceImage.BitDepth.ToString() + " to " + BitDepth.ToString() + " conversion");
}
}
}
void SubPixRender(IImageReaderWriter dest, Scanline scanline, Color color)
{
byte[] covers = scanline.GetCovers();
int num_spans = scanline.SpanCount;
int y = scanline.Y;
byte[] buffer = dest.GetBuffer();
IPixelBlender blender = dest.GetRecieveBlender();
int last_x = int.MinValue;
int bufferOffset = 0;
//------------------------------------------
Color bgColor = Color.White;
float cb_R = bgColor.R / 255f;
float cb_G = bgColor.G / 255f;
float cb_B = bgColor.B / 255f;
float cf_R = color.R / 255f;
float cf_G = color.G / 255f;
float cf_B = color.B / 255f;
//------------------------------------------
int prevCover = -1;
for (int i = 1; i <= num_spans; ++i)
{
//render span by span
ScanlineSpan span = scanline.GetSpan(i);
if (span.x != last_x + 1)
{
bufferOffset = dest.GetBufferOffsetXY(span.x, y);
}
last_x = span.x;
int num_pix = span.len;
if (num_pix < 0)
{
//special encode***
num_pix = -num_pix; //make it positive value
last_x += (num_pix - 1);
//long span with coverage
int coverageValue = covers[span.cover_index];
//-------------------------------------------
if (coverageValue >= 255)
{
//100% cover
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
Color todrawColor = Color.FromArgb(a, Color.FromArgb(color.R, color.G, color.B));
while (num_pix > 0)
{
blender.BlendPixel(buffer, bufferOffset, todrawColor);
bufferOffset += 4; //1 pixel 4 bytes
--num_pix;
}
}
else
{
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
Color newc = Color.FromArgb(color.R, color.G, color.B);
Color todrawColor = Color.FromArgb(a, newc);
while (num_pix > 0)
{
blender.BlendPixel(buffer, bufferOffset, todrawColor);
bufferOffset += 4; //1 pixel 4 bytes
--num_pix;
}
}
prevCover = coverageValue;
}
else
{
int coverIndex = span.cover_index;
last_x += (num_pix - 1);
while (num_pix > 0)
{
int coverageValue = covers[coverIndex++];
if (coverageValue >= 255)
{
//100% cover
Color newc = Color.FromArgb(color.R, color.G, color.B);
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, Color.FromArgb(a, newc));
prevCover = coverageValue;
}
else
{
//check direction :
bool isUpHill = coverageValue >= prevCover;
//if (isUpHill != ((coverageValue % 2) > 0))
//{
//}
//----------------------------
byte c_r = 0, c_g = 0, c_b = 0;
//----------------------------
//assume lcd screen is RGB
float subpix_percent = ((float)(coverageValue) / 256f);
if (coverageValue < cover_1_3)
{
//assume LCD color arrangement is BGR
if (isUpHill)
{
c_r = bgColor.R;
c_g = bgColor.G;
c_b = (byte)(mix(cb_B, cf_B, subpix_percent) * 255);
}
else
{
c_r = (byte)(mix(cb_R, cf_R, subpix_percent) * 255);
c_g = bgColor.G;
c_b = bgColor.B;
}
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, Color.FromArgb(a, Color.FromArgb(c_r, c_g, c_b)));
}
else if (coverageValue < cover_2_3)
{
if (isUpHill)
{
c_r = bgColor.R;
c_g = (byte)(mix(cb_G, cf_G, subpix_percent) * 255);
c_b = (byte)(mix(cb_B, cf_B, 1) * 255);
}
else
{
c_r = (byte)(mix(cb_R, cf_R, 1) * 255);
c_g = (byte)(mix(cb_G, cf_G, subpix_percent) * 255);
c_b = bgColor.B;
}
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, Color.FromArgb(a, Color.FromArgb(c_r, c_g, c_b)));
}
else
{
//cover > 2/3 but not full
if (isUpHill)
{
c_r = (byte)(mix(cb_R, cf_R, subpix_percent) * 255);
c_g = (byte)(mix(cb_G, cf_G, 1) * 255);
c_b = (byte)(mix(cb_B, cf_B, 1) * 255);
}
else
{
c_r = (byte)(mix(cb_R, cf_R, 1) * 255);
c_g = (byte)(mix(cb_G, cf_G, 1) * 255);
c_b = (byte)(mix(cb_B, cf_B, subpix_percent) * 255);
}
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, Color.FromArgb(a, Color.FromArgb(c_r, c_g, c_b)));
}
}
bufferOffset += 4; //1 pixel 4 bits
--num_pix;
prevCover = coverageValue;
}
}
}
}
public byte[] GetBuffer()
{
return(linkedImage.GetBuffer());
}
void CopyFromNoClipping(IImageReaderWriter sourceImage, RectInt clippedSourceImageRect, int destXOffset, int destYOffset)
{
if (BytesBetweenPixelsInclusive != BitDepth / 8
|| sourceImage.BytesBetweenPixelsInclusive != sourceImage.BitDepth / 8)
{
throw new Exception("WIP we only support packed pixel formats at this time.");
}
if (BitDepth == sourceImage.BitDepth)
{
int lengthInBytes = clippedSourceImageRect.Width * BytesBetweenPixelsInclusive;
int sourceOffset = sourceImage.GetBufferOffsetXY(clippedSourceImageRect.Left, clippedSourceImageRect.Bottom);
byte[] sourceBuffer = sourceImage.GetBuffer();
byte[] destBuffer = GetBuffer();
int destOffset = GetBufferOffsetXY(clippedSourceImageRect.Left + destXOffset, clippedSourceImageRect.Bottom + destYOffset);
for (int i = 0; i < clippedSourceImageRect.Height; i++)
{
AggMemMx.memmove(destBuffer, destOffset, sourceBuffer, sourceOffset, lengthInBytes);
sourceOffset += sourceImage.Stride;
destOffset += Stride;
}
}
else
{
bool haveConversion = true;
switch (sourceImage.BitDepth)
{
case 24:
switch (BitDepth)
{
case 32:
{
int numPixelsToCopy = clippedSourceImageRect.Width;
for (int i = clippedSourceImageRect.Bottom; i < clippedSourceImageRect.Top; i++)
{
int sourceOffset = sourceImage.GetBufferOffsetXY(clippedSourceImageRect.Left, clippedSourceImageRect.Bottom + i);
byte[] sourceBuffer = sourceImage.GetBuffer();
byte[] destBuffer = GetBuffer();
int destOffset = GetBufferOffsetXY(clippedSourceImageRect.Left + destXOffset,
clippedSourceImageRect.Bottom + i + destYOffset);
for (int x = 0; x < numPixelsToCopy; x++)
{
destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
destBuffer[destOffset++] = sourceBuffer[sourceOffset++];
destBuffer[destOffset++] = 255;
}
}
}
break;
default:
haveConversion = false;
break;
}
break;
default:
haveConversion = false;
break;
}
if (!haveConversion)
{
throw new NotImplementedException("You need to write the " + sourceImage.BitDepth.ToString() + " to " + BitDepth.ToString() + " conversion");
}
}
}
void SubPixRender(IImageReaderWriter dest, Scanline scanline, ColorRGBA color)
{
byte[] covers = scanline.GetCovers();
int num_spans = scanline.SpanCount;
int y = scanline.Y;
byte[] buffer = dest.GetBuffer();
IPixelBlender blender = dest.GetRecieveBlender();
int last_x = int.MinValue;
int prev_cover = 0;
int bufferOffset = 0;
ColorRGBA prevColor = ColorRGBA.White;
for (int i = 1; i <= num_spans; ++i)
{
//render span by span
ScanlineSpan span = scanline.GetSpan(i);
if (span.x != last_x + 1)
{
bufferOffset = dest.GetBufferOffsetXY(span.x, y);
//when skip then reset
prev_cover = 0;
prevColor = ColorRGBA.White;
}
last_x = span.x;
int num_pix = span.len;
if (num_pix < 0)
{
//special encode***
num_pix = -num_pix; //make it positive value
last_x += (num_pix - 1);
//long span with coverage
int coverageValue = covers[span.cover_index];
//-------------------------------------------
if (coverageValue >= 255)
{
//100% cover
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
ColorRGBA newc = prevColor = new ColorRGBA(color.red, color.green, color.blue);
ColorRGBA todrawColor = new ColorRGBA(newc, a);
prev_cover = 255;//full
while (num_pix > 0)
{
blender.BlendPixel(buffer, bufferOffset, todrawColor);
bufferOffset += 4; //1 pixel 4 bytes
--num_pix;
}
}
else
{
prev_cover = coverageValue;
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
ColorRGBA newc = prevColor = new ColorRGBA(color.red, color.green, color.blue);
ColorRGBA todrawColor = new ColorRGBA(newc, a);
while (num_pix > 0)
{
blender.BlendPixel(buffer, bufferOffset, todrawColor);
bufferOffset += 4; //1 pixel 4 bytes
--num_pix;
}
}
}
else
{
int coverIndex = span.cover_index;
last_x += (num_pix - 1);
while (num_pix > 0)
{
int coverageValue = covers[coverIndex++];
if (coverageValue >= 255)
{
//100% cover
ColorRGBA newc = new ColorRGBA(color.red, color.green, color.blue);
prevColor = newc;
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, new ColorRGBA(newc, a));
prev_cover = 255;//full
}
else
{
//check direction :
bool isLeftToRight = coverageValue >= prev_cover;
prev_cover = coverageValue;
byte c_r, c_g, c_b;
float subpix_percent = ((float)(coverageValue) / 256f);
if (coverageValue < cover_1_3)
{
if (isLeftToRight)
{
c_r = 255;
c_g = 255;
c_b = (byte)(255 - (255f * (subpix_percent)));
}
else
{
c_r = (byte)(255 - (255f * (subpix_percent)));
c_g = 255;
c_b = 255;
}
ColorRGBA newc = prevColor = new ColorRGBA(c_r, c_g, c_b);
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, new ColorRGBA(newc, a));
}
else if (coverageValue < cover_2_3)
{
if (isLeftToRight)
{
c_r = prevColor.blue;
c_g = (byte)(255 - (255f * (subpix_percent)));
c_b = color.blue;
}
else
{
c_r = color.blue;
c_g = (byte)(255 - (255f * (subpix_percent)));
c_b = 255;
}
ColorRGBA newc = prevColor = new ColorRGBA(c_r, c_g, c_b);
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, new ColorRGBA(newc, a));
}
else
{
//cover > 2/3 but not full
if (isLeftToRight)
{
c_r = (byte)(255 - (255f * (subpix_percent)));
c_g = color.green;
c_b = color.blue;
}
else
{
c_r = prevColor.green;
c_g = prevColor.blue;
c_b = (byte)(255 - (255f * (subpix_percent)));
}
ColorRGBA newc = prevColor = new ColorRGBA(c_r, c_g, c_b);
int a = ((coverageValue + 1) * color.Alpha0To255) >> 8;
blender.BlendPixel(buffer, bufferOffset, new ColorRGBA(newc, a));
}
}
bufferOffset += 4; //1 pixel 4 bits
--num_pix;
}
}
}
}
bool Attach(IImageReaderWriter sourceImage, int x1, int y1, int x2, int y2)
{
m_ByteBuffer = null;
if (x1 > x2 || y1 > y2)
{
throw new Exception("You need to have your x1 and y1 be the lower left corner of your sub image.");
}
RectInt boundsRect = new RectInt(x1, y1, x2, y2);
if (boundsRect.Clip(new RectInt(0, 0, (int)sourceImage.Width - 1, (int)sourceImage.Height - 1)))
{
SetDimmensionAndFormat(boundsRect.Width, boundsRect.Height, sourceImage.Stride, sourceImage.BitDepth, sourceImage.BytesBetweenPixelsInclusive);
int bufferOffset = sourceImage.GetBufferOffsetXY(boundsRect.Left, boundsRect.Bottom);
byte[] buffer = sourceImage.GetBuffer();
SetBuffer(buffer, bufferOffset);
return true;
}
return false;
}
void Attach(IImageReaderWriter sourceImage,
IPixelBlender recieveBlender,
int distanceBetweenPixelsInclusive,
int bufferOffset,
int bitsPerPixel)
{
SetDimmensionAndFormat(sourceImage.Width,
sourceImage.Height,
sourceImage.Stride,
bitsPerPixel,
distanceBetweenPixelsInclusive);
int offset = sourceImage.GetBufferOffsetXY(0, 0);
byte[] buffer = sourceImage.GetBuffer();
SetBuffer(buffer, offset + bufferOffset);
SetRecieveBlender(recieveBlender);
}
public byte[] GetBuffer()
{
//TODO: review here, this may not correct
return(linkedImage.GetBuffer());
}
// Create
//--------------------------------------------------------------------
public void Create(IImageReaderWriter src)
{
// we are going to create a dialated image for filtering
// we add m_dilation pixels to every side of the image and then copy the image in the x
// dirrection into each end so that we can sample into this image to get filtering on x repeating
// if the original image look like this
//
// 123456
//
// the new image would look like this
//
// 0000000000
// 0000000000
// 5612345612
// 0000000000
// 0000000000
m_height = (int)AggBasics.uceil(src.Height);
m_width = (int)AggBasics.uceil(src.Width);
m_width_hr = (int)AggBasics.uround(src.Width * LineAA.SUBPIXEL_SCALE);
m_half_height_hr = (int)AggBasics.uround(src.Height * LineAA.SUBPIXEL_SCALE / 2);
m_offset_y_hr = m_dilation_hr + m_half_height_hr - LineAA.SUBPIXEL_SCALE / 2;
m_half_height_hr += LineAA.SUBPIXEL_SCALE / 2;
int bufferWidth = m_width + m_dilation * 2;
int bufferHeight = m_height + m_dilation * 2;
int bytesPerPixel = src.BitDepth / 8;
int newSizeInBytes = bufferWidth * bufferHeight * bytesPerPixel;
if (m_DataSizeInBytes < newSizeInBytes)
{
m_DataSizeInBytes = newSizeInBytes;
m_data = new byte[m_DataSizeInBytes];
}
m_buf = new ChildImage(m_data, 0, bufferWidth, bufferHeight, bufferWidth * bytesPerPixel, src.BitDepth, bytesPerPixel);
byte[] destBuffer = m_buf.GetBuffer();
byte[] srcBuffer = src.GetBuffer();
// copy the image into the middle of the dest
for (int y = 0; y < m_height; y++)
{
for (int x = 0; x < m_width; x++)
{
int sourceOffset = src.GetBufferOffsetXY(x, y);
int destOffset = m_buf.GetBufferOffsetXY(m_dilation, y + m_dilation);
for (int channel = 0; channel < bytesPerPixel; channel++)
{
destBuffer[destOffset++] = srcBuffer[sourceOffset++];
}
}
}
// copy the first two pixels form the end into the begining and from the begining into the end
for (int y = 0; y < m_height; y++)
{
int s1Offset = src.GetBufferOffsetXY(0, y);
int d1Offset = m_buf.GetBufferOffsetXY(m_dilation + m_width, y);
int s2Offset = src.GetBufferOffsetXY(m_width - m_dilation, y);
int d2Offset = m_buf.GetBufferOffsetXY(0, y);
for (int x = 0; x < m_dilation; x++)
{
for (int channel = 0; channel < bytesPerPixel; channel++)
{
destBuffer[d1Offset++] = srcBuffer[s1Offset++];
destBuffer[d2Offset++] = srcBuffer[s2Offset++];
}
}
}
}
// Create
//--------------------------------------------------------------------
public void Create(IImageReaderWriter src)
{
// we are going to create a dialated image for filtering
// we add m_dilation pixels to every side of the image and then copy the image in the x
// dirrection into each end so that we can sample into this image to get filtering on x repeating
// if the original image look like this
//
// 123456
//
// the new image would look like this
//
// 0000000000
// 0000000000
// 5612345612
// 0000000000
// 0000000000
m_height = (int)AggBasics.uceil(src.Height);
m_width = (int)AggBasics.uceil(src.Width);
m_width_hr = (int)AggBasics.uround(src.Width * LineAA.SUBPIXEL_SCALE);
m_half_height_hr = (int)AggBasics.uround(src.Height * LineAA.SUBPIXEL_SCALE / 2);
m_offset_y_hr = m_dilation_hr + m_half_height_hr - LineAA.SUBPIXEL_SCALE / 2;
m_half_height_hr += LineAA.SUBPIXEL_SCALE / 2;
int bufferWidth = m_width + m_dilation * 2;
int bufferHeight = m_height + m_dilation * 2;
int bytesPerPixel = src.BitDepth / 8;
int newSizeInBytes = bufferWidth * bufferHeight * bytesPerPixel;
if (m_DataSizeInBytes < newSizeInBytes)
{
m_DataSizeInBytes = newSizeInBytes;
m_data = new byte[m_DataSizeInBytes];
}
m_buf = new ChildImage(m_data, 0, bufferWidth, bufferHeight, bufferWidth * bytesPerPixel, src.BitDepth, bytesPerPixel);
byte[] destBuffer = m_buf.GetBuffer();
byte[] srcBuffer = src.GetBuffer();
// copy the image into the middle of the dest
for (int y = 0; y < m_height; y++)
{
for (int x = 0; x < m_width; x++)
{
int sourceOffset = src.GetBufferOffsetXY(x, y);
int destOffset = m_buf.GetBufferOffsetXY(m_dilation, y + m_dilation);
for (int channel = 0; channel < bytesPerPixel; channel++)
{
destBuffer[destOffset++] = srcBuffer[sourceOffset++];
}
}
}
// copy the first two pixels form the end into the begining and from the begining into the end
for (int y = 0; y < m_height; y++)
{
int s1Offset = src.GetBufferOffsetXY(0, y);
int d1Offset = m_buf.GetBufferOffsetXY(m_dilation + m_width, y);
int s2Offset = src.GetBufferOffsetXY(m_width - m_dilation, y);
int d2Offset = m_buf.GetBufferOffsetXY(0, y);
for (int x = 0; x < m_dilation; x++)
{
for (int channel = 0; channel < bytesPerPixel; channel++)
{
destBuffer[d1Offset++] = srcBuffer[s1Offset++];
destBuffer[d2Offset++] = srcBuffer[s2Offset++];
}
}
}
}
