1 /* |
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2 * Copyright (c) 1995, 2004, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.awt.motif; |
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27 |
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28 import java.awt.*; |
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29 import java.util.Hashtable; |
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30 import sun.awt.PlatformFont; |
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31 |
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32 /** |
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33 * A font metrics object for a WServer font. |
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34 * |
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35 * @author Jim Graham |
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36 */ |
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37 public class X11FontMetrics extends FontMetrics { |
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38 /** |
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39 * The widths of the first 256 characters. |
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40 */ |
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41 int widths[]; |
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42 |
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43 /** |
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44 * The standard ascent of the font. This is the logical height |
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45 * above the baseline for the Alphanumeric characters and should |
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46 * be used for determining line spacing. Note, however, that some |
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47 * characters in the font may extend above this height. |
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48 */ |
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49 int ascent; |
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50 |
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51 /** |
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52 * The standard descent of the font. This is the logical height |
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53 * below the baseline for the Alphanumeric characters and should |
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54 * be used for determining line spacing. Note, however, that some |
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55 * characters in the font may extend below this height. |
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56 */ |
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57 int descent; |
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58 |
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59 /** |
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60 * The standard leading for the font. This is the logical amount |
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61 * of space to be reserved between the descent of one line of text |
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62 * and the ascent of the next line. The height metric is calculated |
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63 * to include this extra space. |
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64 */ |
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65 int leading; |
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66 |
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67 /** |
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68 * The standard height of a line of text in this font. This is |
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69 * the distance between the baseline of adjacent lines of text. |
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70 * It is the sum of the ascent+descent+leading. There is no |
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71 * guarantee that lines of text spaced at this distance will be |
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72 * disjoint; such lines may overlap if some characters overshoot |
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73 * the standard ascent and descent metrics. |
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74 */ |
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75 int height; |
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76 |
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77 /** |
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78 * The maximum ascent for all characters in this font. No character |
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79 * will extend further above the baseline than this metric. |
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80 */ |
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81 int maxAscent; |
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82 |
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83 /** |
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84 * The maximum descent for all characters in this font. No character |
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85 * will descend further below the baseline than this metric. |
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86 */ |
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87 int maxDescent; |
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88 |
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89 /** |
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90 * The maximum possible height of a line of text in this font. |
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91 * Adjacent lines of text spaced this distance apart will be |
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92 * guaranteed not to overlap. Note, however, that many paragraphs |
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93 * that contain ordinary alphanumeric text may look too widely |
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94 * spaced if this metric is used to determine line spacing. The |
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95 * height field should be preferred unless the text in a given |
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96 * line contains particularly tall characters. |
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97 */ |
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98 int maxHeight; |
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99 |
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100 /** |
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101 * The maximum advance width of any character in this font. |
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102 */ |
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103 int maxAdvance; |
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104 |
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105 static { |
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106 initIDs(); |
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107 } |
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108 |
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109 /** |
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110 * Initialize JNI field and method IDs for fields that may be |
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111 accessed from C. |
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112 */ |
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113 private static native void initIDs(); |
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114 |
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115 /** |
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116 * Calculate the metrics from the given WServer and font. |
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117 */ |
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118 public X11FontMetrics(Font font) { |
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119 super(font); |
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120 init(); |
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121 } |
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122 |
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123 /** |
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124 * Get leading |
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125 */ |
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126 public int getLeading() { |
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127 return leading; |
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128 } |
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129 |
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130 /** |
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131 * Get ascent. |
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132 */ |
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133 public int getAscent() { |
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134 return ascent; |
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135 } |
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136 |
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137 /** |
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138 * Get descent |
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139 */ |
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140 public int getDescent() { |
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141 return descent; |
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142 } |
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143 |
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144 /** |
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145 * Get height |
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146 */ |
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147 public int getHeight() { |
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148 return height; |
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149 } |
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150 |
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151 /** |
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152 * Get maxAscent |
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153 */ |
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154 public int getMaxAscent() { |
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155 return maxAscent; |
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156 } |
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157 |
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158 /** |
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159 * Get maxDescent |
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160 */ |
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161 public int getMaxDescent() { |
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162 return maxDescent; |
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163 } |
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164 |
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165 /** |
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166 * Get maxAdvance |
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167 */ |
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168 public int getMaxAdvance() { |
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169 return maxAdvance; |
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170 } |
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171 |
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172 /** |
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173 * Return the width of the specified string in this Font. |
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174 */ |
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175 public int stringWidth(String string) { |
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176 return charsWidth(string.toCharArray(), 0, string.length()); |
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177 } |
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178 |
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179 /** |
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180 * Return the width of the specified char[] in this Font. |
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181 */ |
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182 public int charsWidth(char chars[], int offset, int length) { |
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183 Font font = getFont(); |
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184 PlatformFont pf = ((PlatformFont) font.getPeer()); |
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185 if (pf.mightHaveMultiFontMetrics()) { |
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186 return getMFCharsWidth(chars, offset, length, font); |
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187 } else { |
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188 if (widths != null) { |
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189 int w = 0; |
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190 for (int i = offset; i < offset + length; i++) { |
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191 int ch = chars[i]; |
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192 if (ch < 0 || ch >= widths.length) { |
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193 w += maxAdvance; |
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194 } else { |
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195 w += widths[ch]; |
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196 } |
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197 } |
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198 return w; |
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199 } else { |
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200 return maxAdvance * length; |
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201 } |
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202 } |
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203 } |
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204 |
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205 private native int getMFCharsWidth(char chars[], int offset, int length, Font font); |
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206 |
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207 /** |
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208 * Return the width of the specified byte[] in this Font. |
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209 */ |
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210 public native int bytesWidth(byte data[], int off, int len); |
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211 |
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212 /** |
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213 * Get the widths of the first 256 characters in the font. |
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214 */ |
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215 public int[] getWidths() { |
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216 return widths; |
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217 } |
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218 |
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219 native void init(); |
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220 |
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221 static Hashtable table = new Hashtable(); |
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222 |
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223 static synchronized FontMetrics getFontMetrics(Font font) { |
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224 FontMetrics fm = (FontMetrics)table.get(font); |
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225 if (fm == null) { |
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226 table.put(font, fm = new X11FontMetrics(font)); |
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227 } |
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228 return fm; |
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229 } |
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230 } |
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