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//========================================================================
//
// SplashClip.h
//
//========================================================================
#ifndef SPLASHCLIP_H
#define SPLASHCLIP_H
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "SplashTypes.h"
#include "SplashMath.h"
class SplashPath;
class SplashXPath;
class SplashXPathScanner;
class SplashBitmap;
//------------------------------------------------------------------------
enum SplashClipResult {
splashClipAllInside,
splashClipAllOutside,
splashClipPartial
};
//------------------------------------------------------------------------
// SplashClip
//------------------------------------------------------------------------
class SplashClip {
public:
// Create a clip, for the given rectangle.
SplashClip(SplashCoord x0, SplashCoord y0,
SplashCoord x1, SplashCoord y1,
GBool antialiasA);
// Copy a clip.
SplashClip *copy() { return new SplashClip(this); }
~SplashClip();
// Reset the clip to a rectangle.
void resetToRect(SplashCoord x0, SplashCoord y0,
SplashCoord x1, SplashCoord y1);
// Intersect the clip with a rectangle.
SplashError clipToRect(SplashCoord x0, SplashCoord y0,
SplashCoord x1, SplashCoord y1);
// Interesect the clip with <path>.
SplashError clipToPath(SplashPath *path, SplashCoord *matrix,
SplashCoord flatness, GBool eo);
// Returns true if (<x>,<y>) is inside the clip.
GBool test(int x, int y);
// Tests a rectangle against the clipping region. Returns one of:
// - splashClipAllInside if the entire rectangle is inside the
// clipping region, i.e., all pixels in the rectangle are
// visible
// - splashClipAllOutside if the entire rectangle is outside the
// clipping region, i.e., all the pixels in the rectangle are
// clipped
// - splashClipPartial if the rectangle is part inside and part
// outside the clipping region
SplashClipResult testRect(int rectXMin, int rectYMin,
int rectXMax, int rectYMax);
// Similar to testRect, but tests a horizontal span.
SplashClipResult testSpan(int spanXMin, int spanXMax, int spanY);
// Clips an anti-aliased line by setting pixels to zero. On entry,
// all non-zero pixels are between <x0> and <x1>. This function
// will update <x0> and <x1>.
void clipAALine(SplashBitmap *aaBuf, int *x0, int *x1, int y);
// Get the rectangle part of the clip region, in integer coordinates.
int getXMinI() { return xMinI; }
int getXMaxI() { return xMaxI; }
int getYMinI() { return yMinI; }
int getYMaxI() { return yMaxI; }
// Get the number of arbitrary paths used by the clip region.
int getNumPaths() { return length; }
private:
SplashClip(SplashClip *clip);
void grow(int nPaths);
GBool antialias;
SplashCoord xMin, yMin, xMax, yMax;
int xMinI, yMinI, xMaxI, yMaxI;
SplashXPath **paths;
Guchar *flags;
SplashXPathScanner **scanners;
int length, size;
};
#endif
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