82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
//========================================================================
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//
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// SplashScreen.h
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//
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// Copyright 2003-2013 Glyph & Cog, LLC
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//
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//========================================================================
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#ifndef SPLASHSCREEN_H
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#define SPLASHSCREEN_H
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#include <aconf.h>
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#ifdef USE_GCC_PRAGMAS
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#pragma interface
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#endif
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#include "SplashTypes.h"
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//------------------------------------------------------------------------
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// SplashScreen
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//------------------------------------------------------------------------
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typedef Guchar *SplashScreenCursor;
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class SplashScreen {
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public:
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SplashScreen(SplashScreenParams *params);
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SplashScreen(SplashScreen *screen);
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~SplashScreen();
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SplashScreen *copy() { return new SplashScreen(this); }
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// Return the computed pixel value (0=black, 1=white) for the gray
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// level <value> at (<x>, <y>).
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int test(int x, int y, Guchar value) {
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int xx, yy;
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xx = x & sizeM1;
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yy = y & sizeM1;
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return value < mat[(yy << log2Size) + xx] ? 0 : 1;
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}
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// To do a series of tests with the same y value, call
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// getTestCursor(y), and then call testWithCursor(cursor, x, value)
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// for each x.
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SplashScreenCursor getTestCursor(int y) {
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int yy;
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yy = y & sizeM1;
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return &mat[yy << log2Size];
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}
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int testWithCursor(SplashScreenCursor cursor, int x, Guchar value) {
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int xx = x & sizeM1;
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return value >= cursor[xx];
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}
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// Returns true if value is above the white threshold or below the
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// black threshold, i.e., if the corresponding halftone will be
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// solid white or black.
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GBool isStatic(Guchar value) { return value < minVal || value >= maxVal; }
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private:
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void buildDispersedMatrix(int i, int j, int val,
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int delta, int offset);
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void buildClusteredMatrix();
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int distance(int x0, int y0, int x1, int y1);
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void buildSCDMatrix(int r);
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Guchar *mat; // threshold matrix
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int size; // size of the threshold matrix
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int sizeM1; // size - 1
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int log2Size; // log2(size)
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Guchar minVal; // any pixel value below minVal generates
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// solid black
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Guchar maxVal; // any pixel value above maxVal generates
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// solid white
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};
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#endif
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