public void DoesNotOverwriteIsDirtyFlagWhenOnlyFillingSubpixels()
{
var scanner = PolygonScanner.Create(new RectangularPolygon(0.3f, 0.2f, 0.7f, 1.423f), 0, 20, 1, IntersectionRule.OddEven, MemoryAllocator.Default);
float[] buffer = new float[12];
scanner.MoveToNextPixelLine(); // offset
bool isDirty = scanner.ScanCurrentPixelLineInto(0, 0, buffer.AsSpan());
Assert.True(isDirty);
}
/// <inheritdoc/>
protected override void OnFrameApply(ImageFrame <TPixel> source)
{
Configuration configuration = this.Configuration;
ShapeOptions shapeOptions = this.definition.Options.ShapeOptions;
GraphicsOptions graphicsOptions = this.definition.Options.GraphicsOptions;
IBrush brush = this.definition.Brush;
Region region = this.definition.Region;
Rectangle rect = region.Bounds;
bool isSolidBrushWithoutBlending = IsSolidBrushWithoutBlending(graphicsOptions, this.definition.Brush, out SolidBrush solidBrush);
TPixel solidBrushColor = isSolidBrushWithoutBlending ? solidBrush.Color.ToPixel <TPixel>() : default;
// Align start/end positions.
int minX = Math.Max(0, rect.Left);
int maxX = Math.Min(source.Width, rect.Right);
int minY = Math.Max(0, rect.Top);
int maxY = Math.Min(source.Height, rect.Bottom);
if (minX >= maxX)
{
return; // no effect inside image;
}
if (minY >= maxY)
{
return; // no effect inside image;
}
int subpixelCount = FillRegionProcessor.MinimumSubpixelCount;
// we need to offset the pixel grid to account for when we outline a path.
// basically if the line is [1,2] => [3,2] then when outlining at 1 we end up with a region of [0.5,1.5],[1.5, 1.5],[3.5,2.5],[2.5,2.5]
// and this can cause missed fills when not using antialiasing.so we offset the pixel grid by 0.5 in the x & y direction thus causing the#
// region to align with the pixel grid.
if (graphicsOptions.Antialias)
{
subpixelCount = Math.Max(subpixelCount, graphicsOptions.AntialiasSubpixelDepth);
}
using BrushApplicator <TPixel> applicator = brush.CreateApplicator(configuration, graphicsOptions, source, rect);
int scanlineWidth = maxX - minX;
MemoryAllocator allocator = this.Configuration.MemoryAllocator;
bool scanlineDirty = true;
var scanner = PolygonScanner.Create(
region.Shape,
minY,
maxY,
subpixelCount,
shapeOptions.IntersectionRule,
configuration.MemoryAllocator);
try
{
using IMemoryOwner <float> bScanline = allocator.Allocate <float>(scanlineWidth);
Span <float> scanline = bScanline.Memory.Span;
while (scanner.MoveToNextPixelLine())
{
if (scanlineDirty)
{
scanline.Clear();
}
scanlineDirty = scanner.ScanCurrentPixelLineInto(minX, 0, scanline);
if (scanlineDirty)
{
int y = scanner.PixelLineY;
if (!graphicsOptions.Antialias)
{
bool hasOnes = false;
bool hasZeros = false;
for (int x = 0; x < scanline.Length; x++)
{
if (scanline[x] >= 0.5)
{
scanline[x] = 1;
hasOnes = true;
}
else
{
scanline[x] = 0;
hasZeros = true;
}
}
if (isSolidBrushWithoutBlending && hasOnes != hasZeros)
{
if (hasOnes)
{
source.GetPixelRowSpan(y).Slice(minX, scanlineWidth).Fill(solidBrushColor);
}
continue;
}
}
applicator.Apply(scanline, minX, y);
}
}
}
finally
{
// ref structs can't implement interfaces so technically PolygonScanner is not IDisposable
scanner.Dispose();
}
}
/// <inheritdoc/>
protected override void OnFrameApply(ImageFrame <TPixel> source)
{
Configuration configuration = this.Configuration;
ShapeOptions shapeOptions = this.definition.Options.ShapeOptions;
GraphicsOptions graphicsOptions = this.definition.Options.GraphicsOptions;
IBrush brush = this.definition.Brush;
bool isSolidBrushWithoutBlending = IsSolidBrushWithoutBlending(graphicsOptions, brush, out SolidBrush solidBrush);
TPixel solidBrushColor = isSolidBrushWithoutBlending ? solidBrush.Color.ToPixel <TPixel>() : default;
// Align start/end positions.
var interest = Rectangle.Intersect(this.bounds, source.Bounds());
if (interest.Equals(Rectangle.Empty))
{
return; // No effect inside image;
}
int minX = interest.Left;
int subpixelCount = FillPathProcessor.MinimumSubpixelCount;
// We need to offset the pixel grid to account for when we outline a path.
// basically if the line is [1,2] => [3,2] then when outlining at 1 we end up with a region of [0.5,1.5],[1.5, 1.5],[3.5,2.5],[2.5,2.5]
// and this can cause missed fills when not using antialiasing.so we offset the pixel grid by 0.5 in the x & y direction thus causing the#
// region to align with the pixel grid.
if (graphicsOptions.Antialias)
{
subpixelCount = Math.Max(subpixelCount, graphicsOptions.AntialiasSubpixelDepth);
}
using BrushApplicator <TPixel> applicator = brush.CreateApplicator(configuration, graphicsOptions, source, interest);
int scanlineWidth = interest.Width;
MemoryAllocator allocator = this.Configuration.MemoryAllocator;
bool scanlineDirty = true;
var scanner = PolygonScanner.Create(
this.path,
interest.Top,
interest.Bottom,
subpixelCount,
shapeOptions.IntersectionRule,
configuration.MemoryAllocator);
try
{
using IMemoryOwner <float> bScanline = allocator.Allocate <float>(scanlineWidth);
Span <float> scanline = bScanline.Memory.Span;
while (scanner.MoveToNextPixelLine())
{
if (scanlineDirty)
{
scanline.Clear();
}
scanlineDirty = scanner.ScanCurrentPixelLineInto(minX, 0F, scanline);
if (scanlineDirty)
{
int y = scanner.PixelLineY;
if (!graphicsOptions.Antialias)
{
bool hasOnes = false;
bool hasZeros = false;
for (int x = 0; x < scanline.Length; x++)
{
if (scanline[x] >= 0.5F)
{
scanline[x] = 1F;
hasOnes = true;
}
else
{
scanline[x] = 0F;
hasZeros = true;
}
}
if (isSolidBrushWithoutBlending && hasOnes != hasZeros)
{
if (hasOnes)
{
source.PixelBuffer.DangerousGetRowSpan(y).Slice(minX, scanlineWidth).Fill(solidBrushColor);
}
continue;
}
}
applicator.Apply(scanline, minX, y);
}
}
}
finally
{
scanner.Dispose();
}
}