scintilla/XPM.cxx

   1 // Scintilla source code edit control
   2 /** @file XPM.cxx
   3  ** Define a class that holds data in the X Pixmap (XPM) format.
   4  **/
   5 // Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <string.h>
   9 #include <stdlib.h>
  10
  11 #include "Platform.h"
  12
  13 #include "XPM.h"
  14
  15 static const char *NextField(const char *s) {
  16         // In case there are leading spaces in the string
  17         while (*s && *s == ' ') {
  18                 s++;
  19         }
  20         while (*s && *s != ' ') {
  21                 s++;
  22         }
  23         while (*s && *s == ' ') {
  24                 s++;
  25         }
  26         return s;
  27 }
  28
  29 // Data lines in XPM can be terminated either with NUL or "
  30 static size_t MeasureLength(const char *s) {
  31         size_t i = 0;
  32         while (s[i] && (s[i] != '\"'))
  33                 i++;
  34         return i;
  35 }
  36
  37 ColourAllocated XPM::ColourFromCode(int ch) {
  38         return colourCodeTable[ch]->allocated;
  39 #ifdef SLOW
  40         for (int i=0; i<nColours; i++) {
  41                 if (codes[i] == ch) {
  42                         return colours[i].allocated;
  43                 }
  44         }
  45         return colours[0].allocated;
  46 #endif
  47 }
  48
  49 void XPM::FillRun(Surface *surface, int code, int startX, int y, int x) {
  50         if ((code != codeTransparent) && (startX != x)) {
  51                 PRectangle rc(startX, y, x, y+1);
  52                 surface->FillRectangle(rc, ColourFromCode(code));
  53         }
  54 }
  55
  56 XPM::XPM(const char *textForm) :
  57         data(0), codes(0), colours(0), lines(0) {
  58         Init(textForm);
  59 }
  60
  61 XPM::XPM(const char * const *linesForm) :
  62         data(0), codes(0), colours(0), lines(0) {
  63         Init(linesForm);
  64 }
  65
  66 XPM::~XPM() {
  67         Clear();
  68 }
  69
  70 void XPM::Init(const char *textForm) {
  71         Clear();
  72         // Test done is two parts to avoid possibility of overstepping the memory
  73         // if memcmp implemented strangely. Must be 4 bytes at least at destination.
  74         if ((0 == memcmp(textForm, "/* X", 4)) && (0 == memcmp(textForm, "/* XPM */", 9))) {
  75                 // Build the lines form out of the text form
  76                 const char **linesForm = LinesFormFromTextForm(textForm);
  77                 if (linesForm != 0) {
  78                         Init(linesForm);
  79                         delete []linesForm;
  80                 }
  81         } else {
  82                 // It is really in line form
  83                 Init(reinterpret_cast<const char * const *>(textForm));
  84         }
  85 }
  86
  87 void XPM::Init(const char * const *linesForm) {
  88         Clear();
  89         height = 1;
  90         width = 1;
  91         nColours = 1;
  92         data = NULL;
  93         codeTransparent = ' ';
  94         codes = NULL;
  95         colours = NULL;
  96         lines = NULL;
  97         if (!linesForm)
  98                 return;
  99
 100         const char *line0 = linesForm[0];
 101         width = atoi(line0);
 102         line0 = NextField(line0);
 103         height = atoi(line0);
 104         line0 = NextField(line0);
 105         nColours = atoi(line0);
 106         codes = new char[nColours];
 107         colours = new ColourPair[nColours];
 108
 109         int strings = 1+height+nColours;
 110         lines = new char *[strings];
 111         size_t allocation = 0;
 112         for (int i=0; i<strings; i++) {
 113                 allocation += MeasureLength(linesForm[i]) + 1;
 114         }
 115         data = new char[allocation];
 116         char *nextBit = data;
 117         for (int j=0; j<strings; j++) {
 118                 lines[j] = nextBit;
 119                 size_t len = MeasureLength(linesForm[j]);
 120                 memcpy(nextBit, linesForm[j], len);
 121                 nextBit += len;
 122                 *nextBit++ = '\0';
 123         }
 124
 125         for (int code=0; code<256; code++) {
 126                 colourCodeTable[code] = 0;
 127         }
 128
 129         for (int c=0; c<nColours; c++) {
 130                 const char *colourDef = linesForm[c+1];
 131                 codes[c] = colourDef[0];
 132                 colourDef += 4;
 133                 if (*colourDef == '#') {
 134                         colours[c].desired.Set(colourDef);
 135                 } else {
 136                         colours[c].desired = ColourDesired(0xff, 0xff, 0xff);
 137                         codeTransparent = codes[c];
 138                 }
 139                 colourCodeTable[static_cast<unsigned char>(codes[c])] = &(colours[c]);
 140         }
 141 }
 142
 143 void XPM::Clear() {
 144         delete []data;
 145         data = 0;
 146         delete []codes;
 147         codes = 0;
 148         delete []colours;
 149         colours = 0;
 150         delete []lines;
 151         lines = 0;
 152 }
 153
 154 void XPM::RefreshColourPalette(Palette &pal, bool want) {
 155         if (!data || !codes || !colours || !lines) {
 156                 return;
 157         }
 158         for (int i=0; i<nColours; i++) {
 159                 pal.WantFind(colours[i], want);
 160         }
 161 }
 162
 163 void XPM::CopyDesiredColours() {
 164         if (!data || !codes || !colours || !lines) {
 165                 return;
 166         }
 167         for (int i=0; i<nColours; i++) {
 168                 colours[i].Copy();
 169         }
 170 }
 171
 172 void XPM::Draw(Surface *surface, PRectangle &rc) {
 173         if (!data || !codes || !colours || !lines) {
 174                 return;
 175         }
 176         // Centre the pixmap
 177         int startY = rc.top + (rc.Height() - height) / 2;
 178         int startX = rc.left + (rc.Width() - width) / 2;
 179         for (int y=0;y<height;y++) {
 180                 int prevCode = 0;
 181                 int xStartRun = 0;
 182                 for (int x=0; x<width; x++) {
 183                         int code = lines[y+nColours+1][x];
 184                         if (code != prevCode) {
 185                                 FillRun(surface, prevCode, startX + xStartRun, startY + y, startX + x);
 186                                 xStartRun = x;
 187                                 prevCode = code;
 188                         }
 189                 }
 190                 FillRun(surface, prevCode, startX + xStartRun, startY + y, startX + width);
 191         }
 192 }
 193
 194 const char **XPM::LinesFormFromTextForm(const char *textForm) {
 195         // Build the lines form out of the text form
 196         const char **linesForm = 0;
 197         int countQuotes = 0;
 198         int strings=1;
 199         int j=0;
 200         for (; countQuotes < (2*strings) && textForm[j] != '\0'; j++) {
 201                 if (textForm[j] == '\"') {
 202                         if (countQuotes == 0) {
 203                                 // First field: width, height, number of colors, chars per pixel
 204                                 const char *line0 = textForm + j + 1;
 205                                 // Skip width
 206                                 line0 = NextField(line0);
 207                                 // Add 1 line for each pixel of height
 208                                 strings += atoi(line0);
 209                                 line0 = NextField(line0);
 210                                 // Add 1 line for each colour
 211                                 strings += atoi(line0);
 212                                 linesForm = new const char *[strings];
 213                                 if (linesForm == 0) {
 214                                         break;  // Memory error!
 215                                 }
 216                         }
 217                         if (countQuotes / 2 >= strings) {
 218                                 break;  // Bad height or number of colors!
 219                         }
 220                         if ((countQuotes & 1) == 0) {
 221                                 linesForm[countQuotes / 2] = textForm + j + 1;
 222                         }
 223                         countQuotes++;
 224                 }
 225         }
 226         if (textForm[j] == '\0' || countQuotes / 2 > strings) {
 227                 // Malformed XPM! Height + number of colors too high or too low
 228                 delete []linesForm;
 229                 linesForm = 0;
 230         }
 231         return linesForm;
 232 }
 233
 234 // In future, may want to minimize search time by sorting and using a binary search.
 235
 236 XPMSet::XPMSet() : set(0), len(0), maximum(0), height(-1), width(-1) {
 237 }
 238
 239 XPMSet::~XPMSet() {
 240         Clear();
 241 }
 242
 243 void XPMSet::Clear() {
 244         for (int i = 0; i < len; i++) {
 245                 delete set[i];
 246         }
 247         delete []set;
 248         set = 0;
 249         len = 0;
 250         maximum = 0;
 251         height = -1;
 252         width = -1;
 253 }
 254
 255 void XPMSet::Add(int id, const char *textForm) {
 256         // Invalidate cached dimensions
 257         height = -1;
 258         width = -1;
 259
 260         // Replace if this id already present
 261         for (int i = 0; i < len; i++) {
 262                 if (set[i]->GetId() == id) {
 263                         set[i]->Init(textForm);
 264                         return;
 265                 }
 266         }
 267
 268         // Not present, so add to end
 269         XPM *pxpm = new XPM(textForm);
 270         if (pxpm) {
 271                 pxpm->SetId(id);
 272                 pxpm->CopyDesiredColours();
 273                 if (len == maximum) {
 274                         maximum += 64;
 275                         XPM **setNew = new XPM *[maximum];
 276                         for (int i = 0; i < len; i++) {
 277                                 setNew[i] = set[i];
 278                         }
 279                         delete []set;
 280                         set = setNew;
 281                 }
 282                 set[len] = pxpm;
 283                 len++;
 284         }
 285 }
 286
 287 XPM *XPMSet::Get(int id) {
 288         for (int i = 0; i < len; i++) {
 289                 if (set[i]->GetId() == id) {
 290                         return set[i];
 291                 }
 292         }
 293         return 0;
 294 }
 295
 296 int XPMSet::GetHeight() {
 297         if (height < 0) {
 298                 for (int i = 0; i < len; i++) {
 299                         if (height < set[i]->GetHeight()) {
 300                                 height = set[i]->GetHeight();
 301                         }
 302                 }
 303         }
 304         return (height > 0) ? height : 0;
 305 }
 306
 307 int XPMSet::GetWidth() {
 308         if (width < 0) {
 309                 for (int i = 0; i < len; i++) {
 310                         if (width < set[i]->GetWidth()) {
 311                                 width = set[i]->GetWidth();
 312                         }
 313                 }
 314         }
 315         return (width > 0) ? width : 0;
 316 }