//======================================================render_scanline_aa
private static void GenerateAndRenderSingleScanline(IScanlineCache sl, IPixelFormat ren,
SpanAllocator alloc, ISpanGenerator<T> span_gen)
{
int y = sl.Y;
uint num_spans = sl.NumSpans;
ScanlineSpan scanlineSpan = sl.Begin();
byte[] ManagedCoversArray = sl.Covers;
unsafe
{
fixed (byte* pCovers = ManagedCoversArray)
{
for (; ; )
{
int x = scanlineSpan.X;
int len = scanlineSpan.Len;
if (len < 0) len = -len;
if (tempSpanColors.Capacity() < len)
{
tempSpanColors.Allocate((uint)(len));
}
fixed (RGBA_Bytes* pColors = tempSpanColors.Array)
{
span_gen.Generate(pColors, x, y, (uint)len);
#if use_timers
blend_color_hspan.Start();
#endif
ren.BlendColorHSpan(x, y, (uint)len, pColors, (scanlineSpan.Len < 0) ? null : &pCovers[scanlineSpan.CoverIndex], pCovers[scanlineSpan.CoverIndex]);
#if use_timers
blend_color_hspan.Stop();
#endif
}
if (--num_spans == 0) break;
scanlineSpan = sl.GetNextScanlineSpan();
}
}
}
}
public static void RenderCompound(RasterizerCompoundAA<T> ras,
IScanlineCache sl_aa,
IScanlineCache sl_bin,
IPixelFormat pixelFormat,
SpanAllocator alloc,
IStyleHandler sh)
{
#if true
unsafe
{
if (ras.RewindScanlines())
{
int min_x = ras.MinX;
int len = ras.MaxX - min_x + 2;
sl_aa.Reset(min_x, ras.MaxX);
sl_bin.Reset(min_x, ras.MaxX);
//typedef typename BaseRenderer::color_type color_type;
ArrayPOD<RGBA_Bytes> color_span = alloc.Allocate((uint)len * 2);
byte[] ManagedCoversArray = sl_aa.Covers;
fixed (byte* pCovers = ManagedCoversArray)
{
fixed (RGBA_Bytes* pColorSpan = color_span.Array)
{
int mix_bufferOffset = len;
uint num_spans;
uint num_styles;
uint style;
bool solid;
while ((num_styles = ras.SweepStyles()) > 0)
{
if (num_styles == 1)
{
// Optimization for a single style. Happens often
//-------------------------
if (ras.SweepScanline(sl_aa, 0))
{
style = ras.Style(0);
if (sh.IsSolid(style))
{
// Just solid fill
//-----------------------
RenderSolidSingleScanLine(pixelFormat, sl_aa, sh.Color(style));
}
else
{
// Arbitrary span generator
//-----------------------
ScanlineSpan span_aa = sl_aa.Begin();
num_spans = sl_aa.NumSpans;
for (; ; )
{
len = span_aa.Len;
sh.GenerateSpan(pColorSpan,
span_aa.X,
sl_aa.Y,
(uint)len,
style);
pixelFormat.BlendColorHSpan(span_aa.X,
sl_aa.Y,
(uint)span_aa.Len,
pColorSpan,
&pCovers[span_aa.CoverIndex], 0);
if (--num_spans == 0) break;
span_aa = sl_aa.GetNextScanlineSpan();
}
}
}
}
else // there are multiple styles
{
if (ras.SweepScanline(sl_bin, -1))
{
// Clear the spans of the mix_buffer
//--------------------
ScanlineSpan span_bin = sl_bin.Begin();
num_spans = sl_bin.NumSpans;
for (; ; )
{
Basics.MemClear((byte*)&pColorSpan[mix_bufferOffset + span_bin.X - min_x],
span_bin.Len * sizeof(RGBA_Bytes));
if (--num_spans == 0) break;
span_bin = sl_bin.GetNextScanlineSpan();
}
for (uint i = 0; i < num_styles; i++)
{
style = ras.Style(i);
solid = sh.IsSolid(style);
if (ras.SweepScanline(sl_aa, (int)i))
{
//IColorType* colors;
//IColorType* cspan;
//typename ScanlineAA::cover_type* covers;
ScanlineSpan span_aa = sl_aa.Begin();
num_spans = sl_aa.NumSpans;
if (solid)
{
// Just solid fill
//-----------------------
for (; ; )
{
RGBA_Bytes c = sh.Color(style);
len = span_aa.Len;
RGBA_Bytes* colors = &pColorSpan[mix_bufferOffset + span_aa.X - min_x];
byte* covers = &pCovers[span_aa.CoverIndex];
do
{
if (*covers == CoverFull)
{
*colors = c;
}
else
{
colors->Add(c, *covers);
}
++colors;
++covers;
}
while (--len != 0);
if (--num_spans == 0) break;
span_aa = sl_aa.GetNextScanlineSpan();
}
}
else
{
// Arbitrary span generator
//-----------------------
for (; ; )
{
len = span_aa.Len;
RGBA_Bytes* colors = &pColorSpan[mix_bufferOffset + span_aa.X - min_x];
RGBA_Bytes* cspan = pColorSpan;
sh.GenerateSpan(cspan,
span_aa.X,
sl_aa.Y,
(uint)len,
style);
byte* covers = &pCovers[span_aa.CoverIndex];
do
{
if (*covers == CoverFull)
{
*colors = *cspan;
}
else
{
colors->Add(*cspan, *covers);
}
++cspan;
++colors;
++covers;
}
while (--len != 0);
if (--num_spans == 0) break;
span_aa = sl_aa.GetNextScanlineSpan();
}
}
}
}
// Emit the blended result as a color hspan
//-------------------------
span_bin = sl_bin.Begin();
num_spans = sl_bin.NumSpans;
for (; ; )
{
pixelFormat.BlendColorHSpan(span_bin.X,
sl_bin.Y,
(uint)span_bin.Len,
&pColorSpan[mix_bufferOffset + span_bin.X - min_x],
null,
CoverFull);
if (--num_spans == 0) break;
span_bin = sl_bin.GetNextScanlineSpan();
}
} // if(ras.sweep_scanline(sl_bin, -1))
} // if(num_styles == 1) ... else
} // while((num_styles = ras.sweep_styles()) > 0)
}
}
} // if(ras.rewind_scanlines())
#endif
}
}
public unsafe virtual void BlendColorHSpan(int x, int y, uint len, RGBA_Bytes *colors, byte *covers, byte cover)
{
m_pixf.BlendColorHSpan(x, y, len, colors, covers, cover);
}