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1 /* Face data structures.
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2 Copyright (C) 1995 Board of Trustees, University of Illinois.
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3 Copyright (C) 1995 Ben Wing
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 #ifndef _XEMACS_FACES_H_
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25 #define _XEMACS_FACES_H_
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26
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27 #include "dynarr.h"
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28 #include "buffer.h" /* for NUM_LEADING_BYTES */
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29
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30 /* a struct Lisp_Face is the C object corresponding to a face. There
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31 is one of these per face. It basically contains all of the specifiers
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32 for the built-in face properties, plus the plist of user-specified
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33 properties. */
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34
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35 struct Lisp_Face
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36 {
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37 struct lcrecord_header header;
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38
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39 Lisp_Object name;
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40 Lisp_Object doc_string;
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41 unsigned int dirty :1; /* Set whenever a face property is changed on
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42 a face. */
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43
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44 Lisp_Object foreground;
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45 Lisp_Object background;
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46 Lisp_Object font;
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47
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48 Lisp_Object display_table;
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49 Lisp_Object background_pixmap;
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50
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51 Lisp_Object underline;
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52 Lisp_Object strikethru;
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53 Lisp_Object highlight;
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54 Lisp_Object dim;
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55 Lisp_Object blinking;
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56 Lisp_Object reverse;
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57
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58 Lisp_Object plist;
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59
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60 Lisp_Object charsets_warned_about;
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61 };
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62
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63 /*
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64
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65 A face cache element caches the results of instantiating the
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66 properties of a face in a particular window. (Instantiation can
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67 take a long time so this is very important.) Each window contains
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68 an array of face cache elements (called the "face cache"), one for
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69 each face that has been seen in the window so far.
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70
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71 Some tricky stuff is done to make sure the face cache does not
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72 become inconsistent:
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73
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74 1) Switching buffers in a window clears the face cache for that
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75 window, because this can change the way any property is
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76 instantiated in the window.
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77 2) Setting a face property causes that face to be marked as
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78 dirty. This causes various stuff to happen to make sure
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79 the appropriate face cache elements are invalidated.
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80 (#### Actually this doesn't work quite right, and errs
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81 too much on the side of invalidating unnecessary stuff.)
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82
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83 There are also face cache elements for "merged faces", which are the
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84 result of merging all the faces that overlap a particular buffer
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85 position. The merging is always done in the context of a particular
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86 domain (specifically, a window), and the face cache element is
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87 specific to a particular window. (Face cache elements are contained
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88 in an array that is attached to each struct_window.) The reason that
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89 the merging takes place in the context of a particular window has
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90 to do with the way the merging works:
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91
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92 1) All extents overlying the buffer position are sorted by descending
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93 priority.
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94 2) The property of a particular merged face comes from the highest-
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95 priority face that specifies a value for that particular property.
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96 3) The way to determine whether a face specifies a value for a
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97 particular property is to instantiate that face's property in
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98 the window in question with the no-fallback option set, to
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99 see if we got anything.
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100
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101 For Mule, things get a bit trickier because there can be multiple
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102 fonts per face/window combination -- the charset is an argument
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103 to specifier-instance.
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104
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105 We have two possible data structure representations:
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106
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107 1) Keep the original "one font per face cache element" representation
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108 and use a different face cache element for each charset.
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109 2) Allow multiple fonts to be in a single face cache element.
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110
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111 I've chosen to use (2) -- the data structure gets more complicated
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112 but the algorithms for maintaining face cache elements end up
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113 simpler.
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114 */
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115
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116 #define NUM_STATIC_CACHEL_FACES 4
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117
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118 struct face_cachel
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119 {
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120 /* There are two kinds of cachels; those created from a single face
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121 and those created by merging more than one face. In the former
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122 case, the FACE element specifies the face used. In the latter
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123 case, the MERGED_FACES_STATIC and MERGED_FACES elements specify
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124 the faces used for merging by giving the indices of the
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125 corresponding single-face cachels.
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126
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127 Formerly we didn't bother to keep track of the faces used for
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128 merging. We do know because we need to do so because there is no
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129 other way to properly handle multiple charsets for Mule in the
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130 presence of display tables short of always computing the values
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131 for all charsets, which is very expensive. Instead, we use a
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132 lazy scheme where we only compute the font for a particular charset
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133 when it is needed. (The exception is the font for the ASCII charset.
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134 We always compute it, just like the other attributes, because
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135 many places in the C code refer to the font of the ASCII charset
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136 and expect it to always be there.)
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137
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138 We store the first four faces in a static array, and use a
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139 Dynarr for the rest. This has the advantage that the space used
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140 is small but the Dynarr will almost never be created, so we
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141 won't spend much time in malloc()/free().
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142
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143 The order of the faces here is decreasing extent priority. */
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144 Lisp_Object face;
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145 int merged_faces_static[NUM_STATIC_CACHEL_FACES];
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146 int_dynarr *merged_faces;
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147 int nfaces;
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148
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149 /* The values stored here are computed by calling specifier_instance()
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150 on the appropriate specifiers. This means that we will have either
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151 a value computed from the face itself or a value computed from the
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152 default face. We need to distinguish the two so that merging works
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153 properly -- a value that comes from the default face is treated
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154 as "unspecified" during merging and is overridden by lower-priority
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155 faces. This is what the _specified flags below are for. */
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156
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157 Lisp_Object foreground;
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158 Lisp_Object background;
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159 /* There are currently 128 possible charsets under Mule. For the
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160 moment we just take the easy way out and allocate space for each
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161 of them. This avoids messing with Dynarrs.
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162
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163 #### We should look into this and probably clean it up
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164 to use Dynarrs. This may be a big space hog as is. */
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165 Lisp_Object font[NUM_LEADING_BYTES];
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166
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167 Lisp_Object display_table;
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168 Lisp_Object background_pixmap;
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169
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170 unsigned int underline :1;
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171 unsigned int strikethru :1;
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172 unsigned int highlight :1;
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173 unsigned int dim :1;
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174 unsigned int blinking :1;
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175 unsigned int reverse :1;
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176
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177 /* Used when merging to tell if the above field represents an actual
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178 value of this face or a fallback value. */
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179 /* #### Of course we should use a bit array or something. */
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180 unsigned char font_specified[NUM_LEADING_BYTES];
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181 unsigned int foreground_specified :1;
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182 unsigned int background_specified :1;
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183 unsigned int display_table_specified :1;
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184 unsigned int background_pixmap_specified :1;
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185
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186 unsigned int strikethru_specified :1;
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187 unsigned int underline_specified :1;
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188 unsigned int highlight_specified :1;
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189 unsigned int dim_specified :1;
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190 unsigned int blinking_specified :1;
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191 unsigned int reverse_specified :1;
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192
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193 /* The updated flag is set after we calculate the values for the
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194 face cachel and cleared whenever a face changes, to indicate
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195 that the values stored here might be wrong. The next time
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196 we go to access the values, we recompute them; if any values
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197 change, we set the DIRTY flag, which tells the output routines
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198 that a face value has in fact changed and the sections of text
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199 using this face need to be redrawn.
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200
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201 It is trickier with fonts because we don't automatically
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202 recompute the fonts but do it only when it is necessary.
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203 (The ASCII font is an exception, of course; see above).
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204
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205 In the case of fonts, we maintain a separate updated flag
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206 for each font. Whenever we need to access the font for
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207 a particular charset, we recalculate it if either its
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208 value is Qunbound (meaning it's never been computed at all)
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209 or the updated flag is not set. We set the dirty flag if
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210 the value is not the same as before and the previous value
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211 was not Qunbound.
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212
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213 #### Note that we don't yet deal with the case of the new
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214 value being Qunbound, as could happen if no fonts of the
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215 right sort are available on the system. In this case, the
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216 whole program will just crash. For the moment, this is
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217 OK (for debugging purposes) but we should fix this by
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218 storing a "blank font" if the instantation fails. */
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219 unsigned int dirty :1;
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220 unsigned int updated :1;
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221 /* #### Of course we should use a bit array or something. */
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222 unsigned char font_updated[NUM_LEADING_BYTES];
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223 };
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224
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225 DECLARE_LRECORD (face, struct Lisp_Face);
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226 #define XFACE(x) XRECORD (x, face, struct Lisp_Face)
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227 #define XSETFACE(x, p) XSETRECORD (x, p, face)
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228 #define FACEP(x) RECORDP (x, face)
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229 #define GC_FACEP(x) GC_RECORDP (x, face)
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230 #define CHECK_FACE(x) CHECK_RECORD (x, face)
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231
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232 Lisp_Object ensure_face_cachel_contains_charset (struct face_cachel *cachel,
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233 Lisp_Object domain,
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234 Lisp_Object charset);
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235 void ensure_face_cachel_complete (struct face_cachel *cachel,
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236 Lisp_Object domain,
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237 unsigned char *charsets);
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238 void update_face_cachel_data (struct face_cachel *cachel,
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239 Lisp_Object domain,
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240 Lisp_Object face);
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241 void face_cachel_charset_font_metric_info (struct face_cachel *cachel,
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242 unsigned char *charsets,
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243 struct font_metric_info *fm);
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244 void mark_face_cachels (face_cachel_dynarr *elements,
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245 void (*markobj) (Lisp_Object));
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246 void mark_face_cachels_as_clean (struct window *w);
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247 void mark_face_cachels_as_not_updated (struct window *w);
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248 void reset_face_cachel (struct face_cachel *inst);
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249 void reset_face_cachels (struct window *w);
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250 face_index get_builtin_face_cache_index (struct window *w,
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251 Lisp_Object face);
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252 #ifdef MEMORY_USAGE_STATS
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253 int compute_face_cachel_usage (face_cachel_dynarr *face_cachels,
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254 struct overhead_stats *ovstats);
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255 #endif /* MEMORY_USAGE_STATS */
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256
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257 void mark_all_faces_as_clean (void);
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258 void init_frame_faces (struct frame *f);
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259 void init_device_faces (struct device *d);
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260 void init_global_faces (struct device *d);
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261 face_index get_extent_fragment_face_cache_index (struct window *w,
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262 struct extent_fragment *ef);
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263 Lisp_Object Ffind_face (Lisp_Object face_or_name);
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264 Lisp_Object Fget_face (Lisp_Object face_or_name);
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265 void update_frame_face_values (struct frame *f);
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266 void face_property_was_changed (Lisp_Object face, Lisp_Object property,
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267 Lisp_Object locale);
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268 void default_face_font_info (Lisp_Object domain, int *ascent,
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269 int *descent, int *height, int *width,
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270 int *proportional_p);
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271 void default_face_height_and_width (Lisp_Object domain,
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272 int *height, int *width);
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273
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274 extern Lisp_Object Qforeground, Qbackground, Qfont, Qdisplay_table;
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275 extern Lisp_Object Qbackground_pixmap, Qunderline, Qhighlight, Qdim;
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276 extern Lisp_Object Qstrikethru,Qblinking, Qreverse;
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277
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278 extern Lisp_Object Vdefault_face, Vmodeline_face;
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279 extern Lisp_Object Vleft_margin_face, Vright_margin_face, Vtext_cursor_face;
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280 extern Lisp_Object Vpointer_face;
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281
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282 #define FACE_CACHEL_FONT(cachel, charset) \
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283 (cachel->font[XCHARSET_LEADING_BYTE (charset) - 128])
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284
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285 #define WINDOW_FACE_CACHEL(window, index) \
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286 Dynarr_atp ((window)->face_cachels, index)
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287
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288 #define FACE_CACHEL_FINDEX_UNSAFE(cachel, offset) \
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289 ((offset) < NUM_STATIC_CACHEL_FACES \
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290 ? (cachel)->merged_faces_static[offset] \
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291 : Dynarr_at ((cachel)->merged_faces, (offset) - NUM_STATIC_CACHEL_FACES))
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292
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293 #define WINDOW_FACE_CACHEL_FACE(window, index) \
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294 (WINDOW_FACE_CACHEL (window, index)->face)
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295 #define WINDOW_FACE_CACHEL_FOREGROUND(window, index) \
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296 (WINDOW_FACE_CACHEL (window, index)->foreground)
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297 #define WINDOW_FACE_CACHEL_BACKGROUND(window, index) \
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298 (WINDOW_FACE_CACHEL (window, index)->background)
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299 /* #### This can be referenced by various functions,
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300 but face_cachels isn't initialized for the stream device.
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301 Since it doesn't need the value we just return nil here to avoid
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302 blowing up in multiple places. */
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303 #define WINDOW_FACE_CACHEL_FONT(window, index, charset) \
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304 ((window)->face_cachels \
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305 ? FACE_CACHEL_FONT (WINDOW_FACE_CACHEL (window, index), charset) \
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306 : Qnil)
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307 #define WINDOW_FACE_CACHEL_DISPLAY_TABLE(window, index) \
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308 (WINDOW_FACE_CACHEL (window, index)->display_table)
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309 #define WINDOW_FACE_CACHEL_BACKGROUND_PIXMAP(window, index) \
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310 (WINDOW_FACE_CACHEL (window, index)->background_pixmap)
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311 #define WINDOW_FACE_CACHEL_DIRTY(window, index) \
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312 (WINDOW_FACE_CACHEL (window, index)->dirty)
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313 #define WINDOW_FACE_CACHEL_UNDERLINE_P(window, index) \
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314 (WINDOW_FACE_CACHEL (window, index)->underline)
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315 #define WINDOW_FACE_CACHEL_HIGHLIGHT_P(window, index) \
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316 (WINDOW_FACE_CACHEL (window, index)->highlight)
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317 #define WINDOW_FACE_CACHEL_DIM_P(window, index) \
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318 (WINDOW_FACE_CACHEL (window, index)->dim)
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319 #define WINDOW_FACE_CACHEL_BLINKING_P(window, index) \
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320 (WINDOW_FACE_CACHEL (window, index)->blinking)
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321 #define WINDOW_FACE_CACHEL_REVERSE_P(window, index) \
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322 (WINDOW_FACE_CACHEL (window, index)->reverse)
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323
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324 #define FACE_PROPERTY_SPECIFIER(face, property) Fget (face, property, Qnil)
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325
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326 #define FACE_PROPERTY_INSTANCE_1(face, property, domain, errb, no_fallback, depth) \
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327 specifier_instance (FACE_PROPERTY_SPECIFIER (face, property), Qunbound, \
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328 domain, errb, 1, no_fallback, depth)
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329
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330 #define FACE_PROPERTY_INSTANCE(face, property, domain, no_fallback, depth) \
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331 FACE_PROPERTY_INSTANCE_1 (face, property, domain, ERROR_ME_NOT, \
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332 no_fallback, depth)
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333
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334 Lisp_Object face_property_matching_instance (Lisp_Object face,
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335 Lisp_Object property,
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336 Lisp_Object charset,
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337 Lisp_Object domain,
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338 Error_behavior errb,
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339 int no_fallback,
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340 Lisp_Object depth);
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341
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342 #define FACE_PROPERTY_SPEC_LIST(face, property, locale) \
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343 Fspecifier_spec_list (FACE_PROPERTY_SPECIFIER (face, property), \
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344 locale, Qnil, Qnil)
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345 #define SET_FACE_PROPERTY(face, property, locale, value, tag, how_to_add) \
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346 Fadd_spec_to_specifier (FACE_PROPERTY_SPECIFIER (face, property), \
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347 locale, value, tag, how_to_add)
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348
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349 #define FACE_FOREGROUND(face, domain) \
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350 FACE_PROPERTY_INSTANCE (face, Qforeground, domain, 0, Qzero)
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351 #define FACE_BACKGROUND(face, domain) \
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352 FACE_PROPERTY_INSTANCE (face, Qbackground, domain, 0, Qzero)
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353 #define FACE_FONT(face, domain, charset) \
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354 face_property_matching_instance (face, Qfont, charset, domain, \
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355 ERROR_ME_NOT, 0, Qzero)
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356 #define FACE_DISPLAY_TABLE(face, domain) \
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357 FACE_PROPERTY_INSTANCE (face, Qdisplay_table, domain, 0, Qzero)
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358 #define FACE_BACKGROUND_PIXMAP(face, domain) \
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359 FACE_PROPERTY_INSTANCE (face, Qbackground_pixmap, domain, 0, Qzero)
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360 #define FACE_UNDERLINE_P(face, domain) \
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361 (!NILP (FACE_PROPERTY_INSTANCE (face, Qunderline, domain, 0, Qzero)))
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362 #define FACE_HIGHLIGHT_P(face, domain) \
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363 (!NILP (FACE_PROPERTY_INSTANCE (face, Qhighlight, domain, 0, Qzero)))
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364 #define FACE_DIM_P(face, domain) \
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365 (!NILP (FACE_PROPERTY_INSTANCE (face, Qdim, domain, 0, Qzero)))
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366 #define FACE_BLINKING_P(face, domain) \
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367 (!NILP (FACE_PROPERTY_INSTANCE (face, Qblinking, domain, 0, Qzero)))
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368 #define FACE_REVERSE_P(face, domain) \
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369 (!NILP (FACE_PROPERTY_INSTANCE (face, Qreverse, domain, 0, Qzero)))
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370
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371 #endif /* _XEMACS_FACES_H_ */
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