1 files changed, 30 insertions, 0 deletions
diff --git a/thirdparty/msdfgen/core/sdf-error-estimation.h b/thirdparty/msdfgen/core/sdf-error-estimation.h
new file mode 100644
index 0000000000..d2fd40d2b8
--- /dev/null
+++ b/thirdparty/msdfgen/core/sdf-error-estimation.h
@@ -0,0 +1,30 @@
+
+#pragma once
+
+#include "Vector2.h"
+#include "Shape.h"
+#include "Projection.h"
+#include "Scanline.h"
+#include "BitmapRef.hpp"
+
+namespace msdfgen {
+
+/// Analytically constructs a scanline at y evaluating fill by linear interpolation of the SDF.
+void scanlineSDF(Scanline &line, const BitmapConstRef<float, 1> &sdf, const Projection &projection, double y, bool inverseYAxis = false);
+void scanlineSDF(Scanline &line, const BitmapConstRef<float, 3> &sdf, const Projection &projection, double y, bool inverseYAxis = false);
+void scanlineSDF(Scanline &line, const BitmapConstRef<float, 4> &sdf, const Projection &projection, double y, bool inverseYAxis = false);
+
+/// Estimates the portion of the area that will be filled incorrectly when rendering using the SDF.
+double estimateSDFError(const BitmapConstRef<float, 1> &sdf, const Shape &shape, const Projection &projection, int scanlinesPerRow, FillRule fillRule = FILL_NONZERO);
+double estimateSDFError(const BitmapConstRef<float, 3> &sdf, const Shape &shape, const Projection &projection, int scanlinesPerRow, FillRule fillRule = FILL_NONZERO);
+double estimateSDFError(const BitmapConstRef<float, 4> &sdf, const Shape &shape, const Projection &projection, int scanlinesPerRow, FillRule fillRule = FILL_NONZERO);
+
+// Old version of the function API's kept for backwards compatibility
+void scanlineSDF(Scanline &line, const BitmapConstRef<float, 1> &sdf, const Vector2 &scale, const Vector2 &translate, bool inverseYAxis, double y);
+void scanlineSDF(Scanline &line, const BitmapConstRef<float, 3> &sdf, const Vector2 &scale, const Vector2 &translate, bool inverseYAxis, double y);
+void scanlineSDF(Scanline &line, const BitmapConstRef<float, 4> &sdf, const Vector2 &scale, const Vector2 &translate, bool inverseYAxis, double y);
+double estimateSDFError(const BitmapConstRef<float, 1> &sdf, const Shape &shape, const Vector2 &scale, const Vector2 &translate, int scanlinesPerRow, FillRule fillRule = FILL_NONZERO);
+double estimateSDFError(const BitmapConstRef<float, 3> &sdf, const Shape &shape, const Vector2 &scale, const Vector2 &translate, int scanlinesPerRow, FillRule fillRule = FILL_NONZERO);
+double estimateSDFError(const BitmapConstRef<float, 4> &sdf, const Shape &shape, const Vector2 &scale, const Vector2 &translate, int scanlinesPerRow, FillRule fillRule = FILL_NONZERO);
+
+}