Initial commit

2026-09-15 14:37:22 +03:00
commit d7b3db31b2
13 changed files with 1071 additions and 0 deletions
@@ -0,0 +1,111 @@
+#ifndef CGE_SCANLINE_H
+#define CGE_SCANLINE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+
+enum CgeScanlineFillRule {
+    CGE_SCANLINE_ODD_EVEN = 0,
+    CGE_SCANLINE_NON_ZERO = (1 << 0),
+};
+
+enum CgeScanlineCode {
+    CGE_SCANLINE_EOK,
+    CGE_SCANLINE_EDONE,
+    CGE_SCANLINE_EAET,
+    CGE_SCANLINE_ESPANS,
+};
+
+typedef struct CgeScanlineEdge {
+    uint32_t startX;
+    uint32_t startY;
+    uint32_t endY;
+    uint32_t step;
+    uint32_t error;
+    uint32_t threshold;
+    uint32_t dir;
+    int winding;
+} CgeScanlineEdge;
+
+typedef struct CgeScanlineEdgeTable {
+    size_t index;
+    uint32_t x;
+    uint32_t error;
+} CgeScanlineEdgeTable;
+
+typedef struct CgeScanlineSpan {
+    uint32_t start;
+    uint32_t end;
+} CgeScanlineSpan;
+
+typedef void (*CgeScanlineRowCallback)(uint32_t y, CgeScanlineSpan *spans,
+                                       size_t size, void *userData);
+
+typedef void (*CgeScanlineLineToCallback)(uint32_t x0, uint32_t y0,
+                                          uint32_t x1, uint32_t y1,
+                                          void *userData);
+
+typedef struct CgeScanlineState {
+    CgeScanlineEdge *edge;
+    size_t edgeSize;
+    CgeScanlineEdgeTable *aet;
+    size_t aetCapacity;
+    CgeScanlineSpan *span;
+    size_t spanCapacity;
+    CgeScanlineRowCallback callback;
+    void *userData;
+    int flags;
+
+    /* Internal state - do not edit */
+    uint32_t yCurrent;
+    uint32_t yMax;
+    size_t aetSize;
+    size_t edgeCursor;
+} CgeScanlineState;
+
+int CgeScanlineStateInit(CgeScanlineState *state, CgeScanlineEdge *edge,
+                         size_t edgeSize, CgeScanlineEdgeTable *aet,
+                         size_t aetCapacity, CgeScanlineSpan *span,
+                         size_t spanCapacity, CgeScanlineRowCallback callback,
+                         void *userData, int flags);
+
+int CgeScanlineStateNext(CgeScanlineState *state, int *result);
+
+int CgeScanlineEdgeAdd(CgeScanlineEdge *edge, uint32_t aX, uint32_t aY,
+                       uint32_t bX, uint32_t bY);
+
+int CgeScanlineSpans(CgeScanlineEdge *edge, size_t edgeSize,
+                     CgeScanlineRowCallback callback, void *userData,
+                     int flags);
+
+void CgeScanlineBezierCubicFlatten(uint32_t x0, uint32_t y0, uint32_t x1,
+                                   uint32_t y1, uint32_t x2, uint32_t y2,
+                                   uint32_t x3, uint32_t y3, uint32_t flatness,
+                                   CgeScanlineLineToCallback lineTo,
+                                   void *userData);
+
+void CgeScanlineBezierQuadFlatten(uint32_t x0, uint32_t y0, uint32_t x1,
+                                  uint32_t y1, uint32_t x2, uint32_t y2,
+                                  uint32_t flatness,
+                                  CgeScanlineLineToCallback lineTo,
+                                  void *userData);
+
+size_t CgeScanlineBezierCubicEdges(CgeScanlineEdge *edge, size_t edgeSize,
+                                   uint32_t x0, uint32_t y0, uint32_t x1,
+                                   uint32_t y1, uint32_t x2, uint32_t y2,
+                                   uint32_t x3, uint32_t y3, uint32_t flatness);
+
+size_t CgeScanlineBezierQuadEdges(CgeScanlineEdge *edge, size_t edgeSize,
+                                  uint32_t x0, uint32_t y0, uint32_t x1,
+                                  uint32_t y1, uint32_t x2, uint32_t y2,
+                                  uint32_t flatness);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CGE_SCANLINE_H */