1 //========================================================================
3 // SplashXPathScanner.h
5 //========================================================================
7 #ifndef SPLASHXPATHSCANNER_H
8 #define SPLASHXPATHSCANNER_H
12 #ifdef USE_GCC_PRAGMAS
16 #include "SplashTypes.h"
20 struct SplashIntersect
;
22 //------------------------------------------------------------------------
24 //------------------------------------------------------------------------
26 class SplashXPathScanner
{
29 // Create a new SplashXPathScanner object. <xPathA> must be sorted.
30 SplashXPathScanner(SplashXPath
*xPathA
, GBool eoA
);
32 ~SplashXPathScanner();
34 // Return the path's bounding box.
35 void getBBox(int *xMinA
, int *yMinA
, int *xMaxA
, int *yMaxA
)
36 { *xMinA
= xMin
; *yMinA
= yMin
; *xMaxA
= xMax
; *yMaxA
= yMax
; }
38 // Return the path's bounding box.
39 void getBBoxAA(int *xMinA
, int *yMinA
, int *xMaxA
, int *yMaxA
);
41 // Return the min/max x values for the span at <y>.
42 void getSpanBounds(int y
, int *spanXMin
, int *spanXMax
);
44 // Returns true if (<x>,<y>) is inside the path.
45 GBool
test(int x
, int y
);
47 // Returns true if the entire span ([<x0>,<x1>], <y>) is inside the
49 GBool
testSpan(int x0
, int x1
, int y
);
51 // Returns the next span inside the path at <y>. If <y> is
52 // different than the previous call to getNextSpan, this returns the
53 // first span at <y>; otherwise it returns the next span (relative
54 // to the previous call to getNextSpan). Returns false if there are
55 // no more spans at <y>.
56 GBool
getNextSpan(int y
, int *x0
, int *x1
);
58 // Renders one anti-aliased line into <aaBuf>. Returns the min and
59 // max x coordinates with non-zero pixels in <x0> and <x1>.
60 void renderAALine(SplashBitmap
*aaBuf
, int *x0
, int *x1
, int y
);
62 // Clips an anti-aliased line by setting pixels to zero. On entry,
63 // all non-zero pixels are between <x0> and <x1>. This function
64 // will update <x0> and <x1>.
65 void clipAALine(SplashBitmap
*aaBuf
, int *x0
, int *x1
, int y
);
69 void computeIntersections(int y
);
73 int xMin
, yMin
, xMax
, yMax
;
75 int interY
; // current y value
76 int interIdx
; // current index into <inter> - used by
78 int interCount
; // current EO/NZWN counter - used by
80 int xPathIdx
; // current index into <xPath> - used by
81 // computeIntersections
82 SplashIntersect
*inter
; // intersections array for <interY>
83 int interLen
; // number of intersections in <inter>
84 int interSize
; // size of the <inter> array