mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Steel/h/colourtran

   1 /****************************************************************************
   2  * This source file was written by Acorn Computers Limited. It is part of   *
   3  * the RISCOS library for writing applications in C for RISC OS. It may be  *
   4  * used freely in the creation of programs for Archimedes. It should be     *
   5  * used with Acorn's C Compiler Release 3 or later.                         *
   6  *                                                                          *
   7  ***************************************************************************/
   8
   9 /*
  10  * Title:  colourtran.h
  11  * Purpose: C interface to the ColourTrans SWIs
  12  *
  13  */
  14
  15 #ifndef __colourtran_h
  16 #define __colourtran_h
  17
  18 #ifndef __os_h
  19 #include "os.h"
  20 #endif
  21
  22 #ifndef __wimp_h
  23 #include "wimp.h"
  24 #endif
  25
  26 #ifndef __font_h
  27 #include "font.h"
  28 #endif
  29
  30
  31 /* ----------------------- colourtran_select_table -------------------------
  32  * Description:   Sets up a translation table in a buffer, given a source
  33  *                mode and palette, and a destination mode and palette.
  34  *
  35  * Parameters:    int source_mode -- source mode
  36  *                wimp_paletteword *source_palette -- source palette
  37  *                int dest_mode -- destination mode
  38  *                wimp_paletteword *dest_palette -- destination palette
  39  *                void *buffer -- pointer to store for the table.
  40  * Returns:       possible error condition.
  41  * Other Info:    none.
  42  *
  43  */
  44
  45 os_error *colourtran_select_table (int source_mode,
  46                                    wimp_paletteword *source_palette,
  47                                    int dest_mode,
  48                                    wimp_paletteword *dest_palette,
  49                                    void *buffer);
  50
  51
  52 /* ---------------------- colourtran_select_GCOLtable ----------------------
  53  * Description:   Sets up a list of GCOLs in a buffer, given a source
  54  *                mode and palette, and a destination mode and palette.
  55  *
  56  * Parameters:    int source_mode -- source mode
  57  *                wimp_paletteword *source_palette -- source palette
  58  *                int dest_mode -- destination mode
  59  *                wimp_paletteword *dest_palette -- destination palette
  60  *                void *buffer -- pointer to store for the list of GCOLs.
  61  * Returns:       possible error condition.
  62  * Other Info:    none.
  63  *
  64  */
  65
  66 os_error *colourtran_select_GCOLtable (int source_mode,
  67                                        wimp_paletteword *source_palette,
  68                                        int dest_mode,
  69                                        wimp_paletteword *dest_palette,
  70                                        void *buffer);
  71
  72
  73 /* ------------------------- colourtran_returnGCOL -------------------------
  74  * Description:   Informs caller of the closest GCOL in the current mode
  75  *                to a given palette entry.
  76  *
  77  * Parameters:    wimp_paletteword entry -- the palette entry
  78  *                int *gcol -- returned GCOL value.
  79  * Returns:       possible error condition.
  80  * Other Info:    none.
  81  *
  82  */
  83
  84 os_error *colourtran_returnGCOL (wimp_paletteword entry, int *gcol);
  85
  86
  87 /* ------------------------ colourtran_setGCOL -----------------------------
  88  * Description:   Informs caller of the closest GCOL in the current mode
  89  *                to a given palette entry, and also sets the GCOL.
  90  *
  91  * Parameters:    wimp_paletteword entry -- the palette entry
  92  *                int fore_back -- set to 0 for foreground,
  93  *                                 set to 128 for background
  94  *                int gcol_in -- GCOL action
  95  *                int *gcol_out -- returned closest GCOL.
  96  * Returns:       possible error condition.
  97  * Other Info:    none.
  98  *
  99  */
 100
 101 os_error *colourtran_setGCOL (wimp_paletteword entry, int fore_back,
 102                               int gcol_in, int *gcol_out);
 103
 104
 105 /* ---------------------- colourtran_return_colournumber -------------------
 106  * Description:   Informs caller of the closeset colour number to a given
 107  *                palette entry, in the current mode and palette
 108  *
 109  * Parameters:    wimp_paletteword entry -- the palette entry
 110  *                int *col -- returned colour number.
 111  * Returns:       possible error condition.
 112  * Other Info:    none.
 113  *
 114  */
 115
 116 os_error *colourtran_return_colournumber (wimp_paletteword entry, int *col);
 117
 118
 119 /* --------------------- colourtran_return_GCOLformode ---------------------
 120  * Description:   Informs caller of the closest GCOL to a given palette
 121  *                entry, destination mode and destination palette.
 122  *
 123  * Parameters:    wimp_paletteword entry -- the palette entry
 124  *                int dest_mode -- destination mode
 125  *                wimp_paletteword *dest_palette -- destination palette
 126  *                int *gcol -- returned closest GCOL.
 127  * Returns:       possible error condition.
 128  * Other Info:    none.
 129  *
 130  */
 131
 132 os_error *colourtran_return_GCOLformode (wimp_paletteword entry,
 133                                          int dest_mode,
 134                                          wimp_paletteword *dest_palette,
 135                                          int *gcol);
 136
 137
 138 /* ------------------ colourtran_return_colourformode ----------------------
 139  * Description:   Informs caller of the closest colour number to a given
 140  *                palette entry, destination mode and destination palette.
 141  *
 142  * Parameters:    wimp_paletteword entry -- the palette entry
 143  *                int dest_mode -- destination mode
 144  *                wimp_paletteword *dest_palette -- destination palette
 145  *                int *col -- returned closest colour number.
 146  * Returns:       possible error condition.
 147  * Other Info:    none.
 148  *
 149  */
 150
 151 os_error *colourtran_return_colourformode (wimp_paletteword entry,
 152                                            int dest_mode,
 153                                            wimp_paletteword *dest_palette,
 154                                            int *col);
 155
 156
 157 /* ----------------------- colourtran_return_OppGCOL -----------------------
 158  * Description:   Informs caller of the furthest GCOL in the current mode
 159  *                from a given palette entry.
 160  *
 161  * Parameters:    wimp_paletteword entry -- the palette entry
 162  *                int *gcol -- returned GCOL value.
 163  * Returns:       possible error condition.
 164  * Other Info:    none.
 165  *
 166  */
 167
 168 os_error *colourtran_return_OppGCOL (wimp_paletteword entry, int *gcol);
 169
 170
 171 /* ------------------------ colourtran_setOppGCOL --------------------------
 172  * Description:   Informs caller of the furthest GCOL in the current mode
 173  *                from a given palette entry, and also sets the GCOL.
 174  *
 175  * Parameters:    wimp_paletteword entry -- the palette entry
 176  *                int fore_back -- set to 0 for foreground,
 177  *                                 set to 128 for background
 178  *                int gcol_in -- GCOL action
 179  *                int *gcol_out -- returned furthest GCOL.
 180  * Returns:       possible error condition.
 181  * Other Info:    none.
 182  *
 183  */
 184
 185 os_error *colourtran_setOppGCOL (wimp_paletteword entry, int fore_back,
 186                                 int gcol_in, int *gcol_out);
 187
 188
 189 /* ---------------------- colourtran_return_Oppcolournumber ----------------
 190  * Description:   Informs caller of the furthest colour number from a given
 191  *                palette entry, in the current mode and palette
 192  *
 193  * Parameters:    wimp_paletteword -- the palette entry
 194  *                int *col -- returned colour number.
 195  * Returns:       possible error condition.
 196  * Other Info:    none.
 197  *
 198  */
 199
 200 os_error *colourtran_return_Oppcolournumber (wimp_paletteword entry,
 201                                              int *col);
 202
 203
 204 /* --------------------- colourtran_return_OppGCOLformode ------------------
 205  * Description:   Informs caller of the furthest GCOL from a given palette
 206  *                entry, destination mode and destination palette.
 207  *
 208  * Parameters:    wimp_paletteword entry -- the palette entry
 209  *                int dest_mode -- destination mode
 210  *                wimp_paletteword *dest_palette -- destination palette
 211  *                int *gcol -- returned furthest GCOL.
 212  * Returns:       possible error condition.
 213  * Other Info:    none.
 214  *
 215  */
 216
 217 os_error *colourtran_return_OppGCOLformode (wimp_paletteword entry,
 218                                             int dest_mode,
 219                                             wimp_paletteword *dest_palette,
 220                                             int *gcol);
 221
 222
 223 /* ------------------ colourtran_return_Oppcolourformode -------------------
 224  * Description:   Informs caller of the furthest colour number from a given
 225  *                palette entry, destination mode and destination palette.
 226  *
 227  * Parameters:    wimp_paletteword entry -- the palette entry
 228  *                int dest_mode -- destination mode
 229  *                wimp_paletteword *dest_palette -- destination palette
 230  *                int *col -- returned furthest colour number.
 231  * Returns:       possible error condition.
 232  * Other Info:    none.
 233  *
 234  */
 235
 236 os_error *colourtran_return_Oppcolourformode (wimp_paletteword entry,
 237                                               int dest_mode,
 238                                               wimp_paletteword *dest_palette,
 239                                               int *col);
 240
 241
 242 /* ---------------------- colourtran_GCOL_tocolournumber -------------------
 243  * Description:   Translates a GCOL to a colournumber (assuming 256-colour
 244  *                mode).
 245  *
 246  * Parameters:    int gcol -- the GCOL
 247  *                int *col -- returned colour number.
 248  * Returns:       possible error condition.
 249  * Other Info:    none.
 250  *
 251  */
 252
 253 os_error *colourtran_GCOL_tocolournumber (int gcol, int *col);
 254
 255
 256 /* ----------------- colourtran_colournumbertoGCOL -------------------------
 257  * Description:   Translates a colour number to a GCOL (assuming 256-colour
 258  *                mode).
 259  *
 260  * Parameters:    int col -- the colour number
 261  *                int *gcol -- the returned GCOL.
 262  * Returns:       possible error condition.
 263  * Other Info:    none.
 264  *
 265  */
 266
 267 os_error *colourtran_colournumbertoGCOL (int col, int *gcol);
 268
 269
 270 /* ------------------ colourtran_returnfontcolours -------------------------
 271  * Description:   Informs caller of font colours to match given colours.
 272  *
 273  * Parameters:    font *handle -- the font's handle
 274  *                wimp_paletteword *backgnd -- background palette entry
 275  *                wimp_paletteword *foregnd -- foreground palette entry
 276  *                int *max_offset
 277  * Returns:       possible error condition.
 278  * Other Info:    Closest approximations to fore/background colours will be
 279  *                set, and as many intermediate colours as possible (up to
 280  *                a maximum of *max_offset). Values are returned through
 281  *                the parameters.
 282  *
 283  */
 284
 285 os_error *colourtran_returnfontcolours (font *handle,
 286                                         wimp_paletteword *backgnd,
 287                                         wimp_paletteword *foregnd,
 288                                         int *max_offset);
 289
 290
 291 /* -------------------- colourtran_setfontcolours --------------------------
 292  * Description:   Informs caller of font colours to match given colours, and
 293  *                calls font_setfontcolour() to set them.
 294  *
 295  * Parameters:    font *handle -- the font's handle
 296  *                wimp_paletteword *backgnd -- background palette entry
 297  *                wimp_paletteword *foregnd -- foreground palette entry
 298  *                int *max_offset
 299  * Returns:       possible error condition.
 300  * Other Info:    Closest approximations to fore/background colours will be
 301  *                set, and as many intermediate colours as possible (up to
 302  *                a maximum of *max_offset). Values are returned through
 303  *                the parameters. Font_setfontcolours() is then called with
 304  *                these as parameters.
 305  *
 306  */
 307 os_error *colourtran_setfontcolours (font *handle,
 308                                      wimp_paletteword *backgnd,
 309                                      wimp_paletteword *foregnd,
 310                                      int *max_offset);
 311
 312
 313 /* ----------------------- colourtran_invalidate_cache ---------------------
 314  * Description:   To be called when the palette has changed since a call was
 315  *                last made to a function in this module.
 316  *
 317  * Parameters:    void.
 318  * Returns:       possible error condition.
 319  * Other Info:    none.
 320  *
 321  */
 322
 323 os_error *colourtran_invalidate_cache (void);
 324
 325
 326 /* new SWIs */
 327
 328 /* ----------------------- colourtran_convert_device_colour ----------------
 329  * Description:   Convert from a device colour to a standard RGB colour
 330  *
 331  * Parameters:    wimp_paletteword device colour
 332                   wimp_paletteword *rgb colour
 333  * Returns:       possible error condition.
 334  * Other Info:    Uses the current calibration to convert from a device
 335  *                colour to a standard RGB palette entry
 336  *
 337  */
 338
 339 os_error *colourtran_convert_device_colour ( wimp_paletteword device,
 340                                              wimp_paletteword *rgb );
 341
 342 #endif
 343 /* end colourtran.h */