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authorKarl Berry <karl@freefriends.org>2021-02-25 19:22:25 +0000
committerKarl Berry <karl@freefriends.org>2021-02-25 19:22:25 +0000
commitad547a6b5986815fda458221149728d9d9ab1d87 (patch)
tree16296910eb3eca724371474ea9aea3994dc69614 /Build/source/libs/xpdf/xpdf-src/splash/SplashScreen.h
parent947b43de3dd21d58ccc2ffadefc4441ea1c2a813 (diff)
restore Build,TODO from r57911
git-svn-id: svn://tug.org/texlive/trunk@57915 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/libs/xpdf/xpdf-src/splash/SplashScreen.h')
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1 files changed, 81 insertions, 0 deletions
diff --git a/Build/source/libs/xpdf/xpdf-src/splash/SplashScreen.h b/Build/source/libs/xpdf/xpdf-src/splash/SplashScreen.h
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index 00000000000..560e2759d82
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+++ b/Build/source/libs/xpdf/xpdf-src/splash/SplashScreen.h
@@ -0,0 +1,81 @@
+//========================================================================
+//
+// SplashScreen.h
+//
+// Copyright 2003-2013 Glyph & Cog, LLC
+//
+//========================================================================
+
+#ifndef SPLASHSCREEN_H
+#define SPLASHSCREEN_H
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma interface
+#endif
+
+#include "SplashTypes.h"
+
+//------------------------------------------------------------------------
+// SplashScreen
+//------------------------------------------------------------------------
+
+typedef Guchar *SplashScreenCursor;
+
+class SplashScreen {
+public:
+
+ SplashScreen(SplashScreenParams *params);
+ SplashScreen(SplashScreen *screen);
+ ~SplashScreen();
+
+ SplashScreen *copy() { return new SplashScreen(this); }
+
+ // Return the computed pixel value (0=black, 1=white) for the gray
+ // level <value> at (<x>, <y>).
+ int test(int x, int y, Guchar value) {
+ int xx, yy;
+ xx = x & sizeM1;
+ yy = y & sizeM1;
+ return value < mat[(yy << log2Size) + xx] ? 0 : 1;
+ }
+
+ // To do a series of tests with the same y value, call
+ // getTestCursor(y), and then call testWithCursor(cursor, x, value)
+ // for each x.
+ SplashScreenCursor getTestCursor(int y) {
+ int yy;
+ yy = y & sizeM1;
+ return &mat[yy << log2Size];
+ }
+
+ int testWithCursor(SplashScreenCursor cursor, int x, Guchar value) {
+ int xx = x & sizeM1;
+ return value >= cursor[xx];
+ }
+
+ // Returns true if value is above the white threshold or below the
+ // black threshold, i.e., if the corresponding halftone will be
+ // solid white or black.
+ GBool isStatic(Guchar value) { return value < minVal || value >= maxVal; }
+
+private:
+
+ void buildDispersedMatrix(int i, int j, int val,
+ int delta, int offset);
+ void buildClusteredMatrix();
+ int distance(int x0, int y0, int x1, int y1);
+ void buildSCDMatrix(int r);
+
+ Guchar *mat; // threshold matrix
+ int size; // size of the threshold matrix
+ int sizeM1; // size - 1
+ int log2Size; // log2(size)
+ Guchar minVal; // any pixel value below minVal generates
+ // solid black
+ Guchar maxVal; // any pixel value above maxVal generates
+ // solid white
+};
+
+#endif