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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/awt/font/autofit/Utils.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/awt/font/autofit/Utils.java | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/awt/font/autofit/Utils.java b/gcc-4.4.3/libjava/classpath/gnu/java/awt/font/autofit/Utils.java new file mode 100644 index 000000000..4df4705a8 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/awt/font/autofit/Utils.java @@ -0,0 +1,255 @@ +/* Utils.java -- A collection of utility functions for the autofitter + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.awt.font.autofit; + +import gnu.java.awt.font.opentype.truetype.Fixed; + +/** + * A collection of utility methods used all around the auto fitter. + */ +class Utils + implements Constants +{ + + private static final int ATAN_BITS = 8; + private static final byte[] ATAN = new byte[] + { + 0, 0, 1, 1, 1, 2, 2, 2, + 3, 3, 3, 3, 4, 4, 4, 5, + 5, 5, 6, 6, 6, 7, 7, 7, + 8, 8, 8, 9, 9, 9, 10, 10, + 10, 10, 11, 11, 11, 12, 12, 12, + 13, 13, 13, 14, 14, 14, 14, 15, + 15, 15, 16, 16, 16, 17, 17, 17, + 18, 18, 18, 18, 19, 19, 19, 20, + 20, 20, 21, 21, 21, 21, 22, 22, + 22, 23, 23, 23, 24, 24, 24, 24, + 25, 25, 25, 26, 26, 26, 26, 27, + 27, 27, 28, 28, 28, 28, 29, 29, + 29, 30, 30, 30, 30, 31, 31, 31, + 31, 32, 32, 32, 33, 33, 33, 33, + 34, 34, 34, 34, 35, 35, 35, 35, + 36, 36, 36, 36, 37, 37, 37, 38, + 38, 38, 38, 39, 39, 39, 39, 40, + 40, 40, 40, 41, 41, 41, 41, 42, + 42, 42, 42, 42, 43, 43, 43, 43, + 44, 44, 44, 44, 45, 45, 45, 45, + 46, 46, 46, 46, 46, 47, 47, 47, + 47, 48, 48, 48, 48, 48, 49, 49, + 49, 49, 50, 50, 50, 50, 50, 51, + 51, 51, 51, 51, 52, 52, 52, 52, + 52, 53, 53, 53, 53, 53, 54, 54, + 54, 54, 54, 55, 55, 55, 55, 55, + 56, 56, 56, 56, 56, 57, 57, 57, + 57, 57, 57, 58, 58, 58, 58, 58, + 59, 59, 59, 59, 59, 59, 60, 60, + 60, 60, 60, 61, 61, 61, 61, 61, + 61, 62, 62, 62, 62, 62, 62, 63, + 63, 63, 63, 63, 63, 64, 64, 64 + }; + + private static final int ANGLE_PI = 256; + private static final int ANGLE_PI2 = ANGLE_PI / 2; + private static final int ANGLE_PI4 = ANGLE_PI / 4; + private static final int ANGLE_2PI = ANGLE_PI * 2; + + /** + * Computes the direction constant for the specified vector. The vector is + * given as differential value already. + * + * @param dx the x vector + * @param dy the y vector + * + * @return the direction of that vector, or DIR_NONE, if that vector is not + * approximating against one of the major axises + */ + static int computeDirection(int dx, int dy) + { + int dir = DIR_NONE; + if (dx < 0) + { + if (dy < 0) + { + if (-dx * 12 < -dy) + dir = DIR_UP; + else if (-dy * 12 < -dx) + dir = DIR_LEFT; + } + else // dy >= 0 . + { + if (-dx * 12 < dy) + dir = DIR_DOWN; + else if (dy * 12 < -dx) + dir = DIR_LEFT; + } + } + else // dx >= 0 . + { + if (dy < 0) + { + if (dx * 12 < -dy) + dir = DIR_UP; + else if (-dy * 12 < dx) + dir = DIR_RIGHT; + } + else // dy >= 0 . + { + if (dx * 12 < dy) + dir = DIR_DOWN; + else if (dy * 12 < dx) + dir = DIR_RIGHT; + } + } + return dir; + } + + public static int atan(int dx, int dy) + { + int angle; + // Trivial cases. + if (dy == 0) + { + angle = 0; + if (dx < 0) + angle = ANGLE_PI; + return angle; + } + else if (dx == 0) + { + angle = ANGLE_PI2; + if (dy < 0) + angle = - ANGLE_PI2; + return angle; + } + + + angle = 0; + if (dx < 0) + { + dx = -dx; + dy = -dy; + angle = ANGLE_PI; + } + if (dy < 0) + { + int tmp = dx; + dx = -dy; + dy = tmp; + angle -= ANGLE_PI2; + } + if (dx == 0 && dy == 0) + return 0; + + if (dx == dy) + angle += ANGLE_PI4; + else if (dx > dy) + { + angle += ATAN[Fixed.div(dy, dx) << (ATAN_BITS - 6)]; + } + else + { + angle += ANGLE_PI2 - ATAN[Fixed.div(dx, dy) << (ATAN_BITS - 6)]; + } + + if (angle > ANGLE_PI) + angle -= ANGLE_2PI; + return angle; + } + + public static int angleDiff(int ang1, int ang2) + { + int delta = ang2 - ang1; + delta %= ANGLE_2PI; + if (delta < 0) + delta += ANGLE_2PI; + if (delta > ANGLE_PI) + delta -= ANGLE_2PI; + return delta; + } + + static void sort(int num, int[] array) + { + int swap; + for (int i = 1; i < num; i++) + { + for (int j = i; j > 0; j--) + { + if (array[j] > array[j - 1]) + break; + swap = array[j]; + array[j] = array[j - 1]; + array[j - 1] = swap; + } + } + } + + static void sort(int num, Width[] array) + { + Width swap; + for (int i = 1; i < num; i++) + { + for (int j = 1; j > 0; j--) + { + if (array[j].org > array[j - 1].org) + break; + swap = array[j]; + array[j] = array[j - 1]; + array[j - 1] = swap; + } + } + } + + static int pixRound(int val) + { + return pixFloor(val + 32); + } + + static int pixFloor(int val) + { + return val & ~63; + } + + public static int mulDiv(int a, int b, int c) + { + long prod = a * b; + long div = (prod / c); + return (int) div; + } + +} |