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annotate examples/dsl/screen.cpp @ 15:f5acaf0c8a29

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Don't cast through "volatile int". Causes a gcc warning nowadays. XXX: should put something else back here to frighten the optimizer
author David A. Holland
date Tue, 31 May 2022 01:00:55 -0400
parents 43d8b194fb4e
children
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1 /*****
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2
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3 AnaGram Programming Examples
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4
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5 A Dos Script Language
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6 Screen Display Module
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7
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8 Copyright 1993 Parsifal Software. All Rights Reserved.
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9
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10 This software is provided 'as-is', without any express or implied
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11 warranty. In no event will the authors be held liable for any damages
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12 arising from the use of this software.
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13
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14 Permission is granted to anyone to use this software for any purpose,
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15 including commercial applications, and to alter it and redistribute it
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16 freely, subject to the following restrictions:
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17
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18 1. The origin of this software must not be misrepresented; you must not
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19 claim that you wrote the original software. If you use this software
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20 in a product, an acknowledgment in the product documentation would be
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21 appreciated but is not required.
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22 2. Altered source versions must be plainly marked as such, and must not be
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23 misrepresented as being the original software.
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24 3. This notice may not be removed or altered from any source distribution.
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25
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26 *****/
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27
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28
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29 #include "screen.h"
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30 #include "pair.h"
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31 #include <assert.h>
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32 #include "util.h"
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33
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34 #ifdef __MSDOS__
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35 #include <dos.h>
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36 #else
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37
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38 /* This is only meant to compile, not run. (Unix, Windows) */
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39 #define far
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40 union REGS { struct { unsigned short ah, bh, dl, dh; } h; };
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41 void INT(unsigned long, union REGS *, union REGS *dst) {
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42 dst->h.ah = dst->h.bh = dst->h.dl = dst->h.dh = 0;
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43 }
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44 #endif
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45
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46 /*****
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47
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48 Video display class
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49
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50 This class is defined to provide screen initialization and access to the
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51 screen. It is not used outside this module.
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52
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53 *****/
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54
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55 class video_display_class {
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56 public:
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57 char_cell far *base;
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58 pair <int> size;
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59 video_display_class()
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60 : base((char_cell *)(COLOR_ADAPTER_ADDRESS))
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61 , size(80,25)
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62 {}
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63
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64 // Access a particular char_cell in the display
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65
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66 char_cell &operator[] (pair<int> p) {
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67 assert(p < size);
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68 return base[p.x + size.x * p.y];
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69 }
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70
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71 pair<int> get_cursor(void) {
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72 union REGS regs;
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73 regs.h.ah = 3;
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74 regs.h.bh = 0;
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75 INT(0x10, &regs, &regs);
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76 return pair<int>(regs.h.dl, regs.h.dh);
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77 }
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78
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79 void set_cursor(pair<int> cp) {
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80 union REGS regs;
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81 regs.h.ah = 2;
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82 regs.h.bh = 0;
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83 regs.h.dl = (char) cp.x;
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84 regs.h.dh = (char) cp.y;
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85 INT(0x10, &regs, &regs);
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86 }
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87 };
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88
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89 // This should be the only instance of a video display class
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90
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91 static video_display_class display;
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92
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93
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94 // Protect display class exists to save and restore screen
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95
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96 protect_display::protect_display() {
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97 n = display.size.x * display.size.y;
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98 p = new char_cell[n];
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99 copy(p,display.base,n);
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100 cursor_position = display.get_cursor();
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101 }
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102
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103 protect_display::~protect_display() {
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104 copy(display.base, p, n);
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105 delete [] p;
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106 display.set_cursor(cursor_position);
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107 }
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108
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109
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110 // Screen Rectangle class
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111
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112
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113 // Set cursor in a screen rectangle
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114
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115 screen_rect &screen_rect::set_cursor(const int x, const int y) {
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116 assert (x < size.x && y < size.y);
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117 pair<int> where(pos.x + x, pos.y + y);
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118 display.set_cursor(where);
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119 return *this;
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120 }
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121
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122 /*****
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123
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124 Create a screen rectangle at a particular location in the display
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125 Rectangle consists of entire screen below and to the right of the
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126 specified coordinates.
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127
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128 *****/
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129
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130 screen_rect at(int x, int y, int jm) {
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131 screen_rect r;
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132 r.pos = pair<int>(x,y);
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133 assert(r.pos < display.size);
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134 r.size = display.size - r.pos;
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135 r.jm.x = (jm/10) & 3;
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136 r.jm.y = (jm%10) & 3;
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137 return r;
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138 }
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139
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140 screen_rect screen_rect::at(int x, int y, int jm) {
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141 screen_rect r = *this;
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142 r.pos = pos + pair<int>(x,y);
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143 assert(r.pos < pos + size);
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144 r.size = size - pair<int>(x,y);
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145 r.jm.x = (jm/10) & 3;
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146 r.jm.y = (jm%10) & 3;
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147 return r;
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148 }
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149
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150 screen_rect screen_rect::rect(int w, int d, int jm) {
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151 screen_rect b = *this;
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152 int jmy = (jm % 10) & 3;
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153 int jmx = (jm / 10) & 3;
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154
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155 if (w < b.size.x) b.size.x = w;
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156 if (d < b.size.y) b.size.y = d;
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157 b.pos.x += (size.x - b.size.x)*jmx/2;
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158 b.pos.y += (size.y - b.size.y)*jmy/2;
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159 return b;
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160 }
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161
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162 screen_rect box(screen_rect r){
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163 screen_rect b = r;
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164 pair <int> p = b.pos;
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165 pair <int> q = b.pos;
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166
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167 q.y += b.size.y - 1;
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168 display[p] = 218;
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169 display[q] = 192;
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170 q.x++;
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171 p.x++;
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172 while (p.x < b.pos.x + b.size.x - 1) {
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173 display[p] = 196;
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174 display[q] = 196;
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175 p.x++;
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176 q.x++;
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177 }
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178 display[p] = 191;
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179 display[q] = 217;
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180 p = b.pos;
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181 p.y++;
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182 q = p;
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183 q.x += b.size.x - 1;
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184 while (p.y < b.pos.y + b.size.y - 1) {
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185 display[p] = 179;
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186 display[q] = 179;
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187 p.y++;
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188 q.y++;
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189 }
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190 b.size.x -= 4;
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191 b.size.y -= 2;
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192 b.pos.x += 2;
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193 b.pos.y++;
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194 return b;
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195 }
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196
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197
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198 screen_rect line(int x, int y, int w, int jm) {
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199 screen_rect r;
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200 char_cell p;
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201
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202 if (w + x > display.size.x) w = display.size.x - x;
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203 r.pos = pair<int>(x,y);
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204 r.size = pair<int>(w,1);
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205 r.jm.x = (jm/10) & 3;
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206 r.jm.y = (jm%10) & 3;
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207 assert(r.pos + r.size <= display.size);
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208 return r;
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209 }
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210
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diff changeset
211 screen_rect screen_rect::line(int x, int y, int w, int jm) const {
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diff changeset
212 screen_rect r;
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213 char_cell p;
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214
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215 if (w + x > size.x) w = size.x - x;
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216 r.pos = pos + pair<int>(x,y);
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217 r.size = pair<int>(w,1);
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218 r.jm.x = (jm/10) & 3;
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219 r.jm.y = (jm%10) & 3;
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220 assert(r.pos + r.size <= display.size);
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221 return r;
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222 }
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223
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224 /*****
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225
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diff changeset
226 Set all char_cells in a rectangle to a given value
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227
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228 *****/
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229
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230 screen_rect &screen_rect:: operator << (const char_cell &p) {
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231 pair<int> limit = pos + size;
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232 pair<int> i = pos;
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233 pair<int> j = pos;
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diff changeset
234 while (i.y < limit.y) {
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235 j = i;
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236 while (j.x < limit.x) display[j] = p, j.x++;
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237 i.y++;
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238 }
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239 return *this;
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240 }
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diff changeset
241
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242 /*****
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243
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244 Set all char_cells in a rectangle to a given color
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245
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246 *****/
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247
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248 screen_rect &screen_rect::tint(int color) {
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249 pair<int> limit = pos + size;
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250 pair<int> i = pos;
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251 pair<int> j = pos;
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diff changeset
252 while (i.y < limit.y) {
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253 j = i;
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254 while (j.x < limit.x) display[j].color = (char) color, j.x++;
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255 i.y++;
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256 }
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257 return *this;
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258 }
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diff changeset
259
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260 screen_rect &screen_rect::tint(int fg, int bg) {
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diff changeset
261 tint(COLOR(fg,bg));
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262 return *this;
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diff changeset
263 }
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diff changeset
264
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diff changeset
265
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266 /*****
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diff changeset
267
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diff changeset
268 Set all display characters within a rectangle to a given value
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269
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270 *****/
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diff changeset
271
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diff changeset
272 screen_rect &screen_rect::operator << (const int c) {
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diff changeset
273 pair<int> limit = pos + size;
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diff changeset
274 pair<int> i = pos;
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diff changeset
275 pair<int> j = pos;
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diff changeset
276 while (i.y < limit.y) {
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diff changeset
277 j = i;
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278 while (j.x < limit.x) display[j].data = (char) c, j.x++;
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diff changeset
279 i.y++;
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diff changeset
280 }
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diff changeset
281 return *this;
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diff changeset
282 }
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diff changeset
283
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284 /*****
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diff changeset
285
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diff changeset
286 Write a string into a screen rectangle, taking account of desired
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
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diff changeset
287 justification mode.
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diff changeset
288
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diff changeset
289 string_size returns the size (width x height) of the string.
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diff changeset
290 str_size adjusts this down, if necesary, to the size of the rectangle
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diff changeset
291 white is the amount of white space, horizontal and vertical to be
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
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diff changeset
292 distributed.
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diff changeset
293 loc is the position where the string display should begin
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diff changeset
294 limit is the location where the string should be clipped
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diff changeset
295
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diff changeset
296
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297 *****/
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diff changeset
298
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diff changeset
299 static int n_lines(const char *s) {
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diff changeset
300 int n = 0;
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diff changeset
301 if (s == NULL) return 0;
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
David A. Holland
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diff changeset
302 while (*s) {
13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
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diff changeset
303 while (*s && *s != '\n') s++;
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diff changeset
304 if (*s == '\n') s++;
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diff changeset
305 n++;
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diff changeset
306 }
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diff changeset
307 return n;
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David A. Holland
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diff changeset
308 }
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diff changeset
309
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diff changeset
310 static int line_width(const char *s) {
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diff changeset
311 int n = 0;
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diff changeset
312 while (*s && *s != '\n') n++, s++;
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313 return n;
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diff changeset
314 }
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diff changeset
315
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diff changeset
316 screen_rect &screen_rect ::operator << (const char *s) {
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David A. Holland
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diff changeset
317 pair<int> loc = pos;
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diff changeset
318 pair<int> limit = pos + size;
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diff changeset
319 int string_height = n_lines(s);
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diff changeset
320 int blank_lines = size.y > string_height ? size.y - string_height : 0;
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diff changeset
321 screen_rect r = *this;
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David A. Holland
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diff changeset
322
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David A. Holland
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diff changeset
323 // Blank lines at top of rectangle
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David A. Holland
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diff changeset
324 r.size.y = blank_lines*jm.y/2;
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diff changeset
325 r << ' ';
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diff changeset
326
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327
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David A. Holland
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328 // Text segment
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diff changeset
329 loc.y += r.size.y;
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diff changeset
330 if (s != NULL) while (*s && loc.y < limit.y) {
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diff changeset
331 pair<int> p = loc;
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David A. Holland
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diff changeset
332 int width = line_width(s);
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David A. Holland
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diff changeset
333 int n = (size.x > width ? size.x - width : 0) * jm.x / 2;
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diff changeset
334
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David A. Holland
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diff changeset
335 // Leading blanks
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David A. Holland
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diff changeset
336 while (n--) {
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diff changeset
337 display[p].data = ' ';
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338 p.x++;
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339 }
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340 // Text
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341 while ( *s && *s != '\n' && p.x < limit.x) {
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342 display[p].data = *s++;
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343 p.x++;
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344 }
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345
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346 // Trailing blanks
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347 while (p.x < limit.x) {
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348 display[p].data = ' ';
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349 p.x++;
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350 }
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351
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352 // Skip to end of line in string
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353 while (*s && *s != '\n') s++;
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354 if (*s == '\n') s++;
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355 loc.y++;
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356 }
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357
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358 // Blank lines at bottom of rectangle
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359 r.pos = loc;
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360 r.size = limit - r.pos;
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361 r << ' ';
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362
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363 return *this;
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364 }
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365
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366
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367 char_cell *contents(const screen_rect &r) {
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368 char_cell *c = new char_cell[r.size.x*r.size.y];
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369 pair<int> pos = r.pos;
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370 pair<int> limit = r.pos + r.size;
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371 int k = 0;
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372 while (pos.y < limit.y) {
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373 pair<int> p = pos;
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374 while (p.x < limit.x) {
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375 c[k++] = display[p];
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376 p.x++;
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377 }
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378 pos.y++;
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379 }
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380 return c;
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381 }
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382
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383 screen_rect &screen_rect::operator << (const char_cell *c) {
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384 pair<int> rpos = pos;
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385 pair<int> limit = pos + size;
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386 int k = 0;
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387 while (rpos.y < limit.y) {
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388 pair<int> p = rpos;
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389 while (p.x < limit.x) {
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390 display[p] = c[k++];
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391 p.x++;
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392 }
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393 rpos.y++;
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394 }
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395 return *this;
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396 }