wrlib/wraster.h

   1 /*
   2  *  Raster graphics library
   3  *
   4  *  Copyright (c) 1997, 1998, 1999 Alfredo K. Kojima
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Library General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Library General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Library General Public
  17  *  License along with this library; if not, write to the Free
  18  *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 /*
  22  * Environment variables:
  23  *
  24  * WRASTER_GAMMA <rgamma>/<ggamma>/<bgamma>
  25  * gamma correction value. Must be  greater than 0
  26  * Only for PseudoColor visuals.
  27  *
  28  * Default:
  29  * WRASTER_GAMMA 1/1/1
  30  *
  31  *
  32  * If you want a specific value for a screen, append the screen number
  33  * preceded by a hash to the variable name as in
  34  * WRASTER_GAMMA#1
  35  * for screen number 1
  36  */
  37
  38 #ifndef RLRASTER_H_
  39 #define RLRASTER_H_
  40
  41
  42 /* version of the header for the library: 0.14 */
  43 #define WRASTER_HEADER_VERSION  14
  44
  45
  46 #include <X11/Xlib.h>
  47 #include <X11/Xutil.h>
  48
  49 #ifdef XSHM
  50 #include <X11/extensions/XShm.h>
  51 #endif
  52
  53 /* RM_MATCH or RM_DITHER */
  54 #define RC_RenderMode           (1<<0)
  55
  56 /* number of colors per channel for colormap in PseudoColor mode */
  57 #define RC_ColorsPerChannel     (1<<1)
  58
  59 /* do gamma correction */
  60 #define RC_GammaCorrection      (1<<2)
  61
  62 /* visual id to use */
  63 #define RC_VisualID             (1<<3)
  64
  65 /* shared memory usage */
  66 #define RC_UseSharedMemory      (1<<4)
  67
  68 /* use default instead of best visual */
  69 #define RC_DefaultVisual        (1<<5)
  70
  71 #ifdef __cplusplus
  72 extern "C" {
  73 #endif /* __cplusplus */
  74
  75 typedef struct RContextAttributes {
  76     int flags;
  77     int render_mode;
  78     int colors_per_channel;            /* for PseudoColor */
  79     float rgamma;                      /* gamma correction for red, */
  80     float ggamma;                      /* green, */
  81     float bgamma;                      /* and blue */
  82     VisualID visualid;                 /* visual ID to use */
  83     int use_shared_memory;             /* True of False */
  84 } RContextAttributes;
  85
  86
  87 /*
  88  * describes a screen in terms of depth, visual, number of colors
  89  * we can use, if we should do dithering, and what colors to use for
  90  * dithering.
  91  */
  92 typedef struct RContext {
  93     Display *dpy;
  94     int screen_number;
  95     Colormap cmap;
  96
  97     RContextAttributes *attribs;
  98
  99     GC copy_gc;
 100
 101     Visual *visual;
 102     int depth;
 103     Window drawable;                   /* window to pass for XCreatePixmap().*/
 104                                        /* generally = root */
 105     int vclass;
 106
 107     unsigned long black;
 108     unsigned long white;
 109
 110     int red_offset;                    /* only used in 24bpp */
 111     int green_offset;
 112     int blue_offset;
 113
 114     /* only used for pseudocolor and grayscale */
 115
 116     XStandardColormap *std_rgb_map;    /* standard RGB colormap */
 117     XStandardColormap *std_gray_map;   /* standard grayscale colormap */
 118
 119     int ncolors;                       /* total number of colors we can use */
 120     XColor *colors;                    /* internal colormap */
 121
 122     struct {
 123         unsigned int use_shared_pixmap:1;
 124     } flags;
 125 } RContext;
 126
 127
 128 typedef struct RColor {
 129     unsigned char red;
 130     unsigned char green;
 131     unsigned char blue;
 132     unsigned char alpha;
 133 } RColor;
 134
 135
 136 typedef struct RHSVColor {
 137     unsigned short hue;                /* 0-359 */
 138     unsigned char saturation;          /* 0-255 */
 139     unsigned char value;               /* 0-255 */
 140 } RHSVColor;
 141
 142
 143
 144 typedef struct RPoint {
 145     int x, y;
 146 } RPoint;
 147
 148
 149 typedef struct RSegment {
 150     int x1, y1, x2, y2;
 151 } RSegment;
 152
 153
 154 /*
 155  * internal 24bit+alpha image representation
 156  */
 157 typedef struct RImage {
 158     unsigned width, height;            /* size of the image */
 159     RColor background;                 /* background color */
 160     unsigned char *data[4];            /* image data (R,G,B,A) */
 161 } RImage;
 162
 163
 164 /*
 165  * internal wrapper for XImage. Used for shm abstraction
 166  */
 167 typedef struct RXImage {
 168     XImage *image;
 169
 170     /* Private data. Do not access */
 171 #ifdef XSHM
 172     XShmSegmentInfo info;
 173     char is_shared;
 174 #endif
 175 } RXImage;
 176
 177
 178 /* note that not all operations are supported in all functions */
 179 enum {
 180     RClearOperation,                   /* clear with 0 */
 181         RCopyOperation,
 182         RNormalOperation,              /* same as combine */
 183         RAddOperation,
 184         RSubtractOperation
 185 };
 186
 187
 188 /* image display modes */
 189 enum {
 190     RDitheredRendering = 0,
 191     RBestMatchRendering = 1
 192 };
 193
 194 /* bw compat */
 195 #define RM_DITHER RDitheredRendering
 196 #define RM_MATCH  RBestMatchRendering
 197
 198 enum {
 199     RAbsoluteCoordinates = 0,
 200     RRelativeCoordinates = 1
 201 };
 202
 203
 204 enum {
 205     RSunkenBevel        = -1,
 206     RRaisedBevel        = 1
 207 };
 208 /* bw compat */
 209 #define RBEV_SUNKEN     RSunkenBevel
 210 /* 1 pixel wide */
 211 #define RBEV_RAISED     RRaisedBevel
 212 /* 1 pixel wide on top/left 2 on bottom/right */
 213 #define RBEV_RAISED2    2
 214 /* 2 pixel width */
 215 #define RBEV_RAISED3    3
 216
 217 enum {
 218     RHorizontalGradient = 2,
 219         RVerticalGradient = 3,
 220         RDiagonalGradient = 4
 221 };
 222 /* for backwards compatibility */
 223 #define RGRD_HORIZONTAL  RHorizontalGradient
 224 #define RGRD_VERTICAL   RVerticalGradient
 225 #define RGRD_DIAGONAL   RDiagonalGradient
 226
 227
 228
 229 /* error codes */
 230 #define RERR_NONE               0
 231 #define RERR_OPEN               1      /* cant open file */
 232 #define RERR_READ               2      /* error reading from file */
 233 #define RERR_WRITE              3      /* error writing to file */
 234 #define RERR_NOMEMORY           4      /* out of memory */
 235 #define RERR_NOCOLOR            5      /* out of color cells */
 236 #define RERR_BADIMAGEFILE       6      /* image file is corrupted or invalid */
 237 #define RERR_BADFORMAT          7      /* image file format is unknown */
 238 #define RERR_BADINDEX           8      /* no such image index in file */
 239
 240 #define RERR_BADVISUALID        16     /* invalid visual ID requested for context */
 241
 242 #define RERR_XERROR             127    /* internal X error */
 243 #define RERR_INTERNAL           128    /* should not happen */
 244
 245
 246 /*
 247  * Returns a NULL terminated array of strings containing the
 248  * supported formats, such as: TIFF, XPM, PNG, JPEG, PPM, GIF
 249  * Do not free the returned data.
 250  */
 251 char **RSupportedFileFormats(void);
 252
 253
 254 char *RGetImageFileFormat(char *file);
 255
 256 /*
 257  * Xlib contexts
 258  */
 259 RContext *RCreateContext(Display *dpy, int screen_number,
 260                          RContextAttributes *attribs);
 261
 262 void RDestroyContext(RContext *context);
 263
 264 Bool RGetClosestXColor(RContext *context, RColor *color, XColor *retColor);
 265
 266 /*
 267  * RImage creation
 268  */
 269 RImage *RCreateImage(unsigned width, unsigned height, int alpha);
 270
 271 RImage *RCreateImageFromXImage(RContext *context, XImage *image, XImage *mask);
 272
 273 RImage *RCreateImageFromDrawable(RContext *context, Drawable drawable,
 274                                  Pixmap mask);
 275
 276 RImage *RLoadImage(RContext *context, char *file, int index);
 277
 278
 279 void RDestroyImage(RImage *image);
 280
 281 RImage *RGetImageFromXPMData(RContext *context, char **data);
 282
 283 /*
 284  * RImage storing
 285  */
 286 Bool RSaveImage(RImage *image, char *filename, char *format);
 287
 288 /*
 289  * Area manipulation
 290  */
 291 RImage *RCloneImage(RImage *image);
 292
 293 RImage *RGetSubImage(RImage *image, int x, int y, unsigned width,
 294                      unsigned height);
 295
 296 void RCombineImageWithColor(RImage *image, RColor *color);
 297
 298 void RCombineImages(RImage *image, RImage *src);
 299
 300 void RCombineArea(RImage *image, RImage *src, int sx, int sy, unsigned width,
 301                  unsigned height, int dx, int dy);
 302
 303 void RCombineImagesWithOpaqueness(RImage *image, RImage *src, int opaqueness);
 304
 305 void RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
 306                                unsigned width, unsigned height, int dx, int dy,
 307                                int opaqueness);
 308
 309 RImage *RScaleImage(RImage *image, unsigned new_width, unsigned new_height);
 310
 311 RImage *RMakeTiledImage(RImage *tile, unsigned width, unsigned height);
 312
 313 RImage* RMakeCenteredImage(RImage *image, unsigned width, unsigned height,
 314                            RColor *color);
 315
 316 /*
 317  * Drawing
 318  */
 319 Bool RGetPixel(RImage *image, int x, int y, RColor *color);
 320
 321 void RPutPixel(RImage *image, int x, int y, RColor *color);
 322
 323 void ROperatePixel(RImage *image, int operation, int x, int y, RColor *color);
 324
 325 void RPutPixels(RImage *image, RPoint *points, int npoints, int mode,
 326                 RColor *color);
 327
 328 void ROperatePixels(RImage *image, int operation, RPoint *points,
 329                     int npoints, int mode, RColor *color);
 330
 331 int RDrawLine(RImage *image, int x0, int y0, int x1, int y1, RColor *color);
 332
 333 int ROperateLine(RImage *image, int operation, int x0, int y0, int x1, int y1,
 334                  RColor *color);
 335
 336 void RDrawLines(RImage *image, RPoint *points, int npoints, int mode,
 337                 RColor *color);
 338
 339 void ROperateLines(RImage *image, int operation, RPoint *points, int npoints,
 340                    int mode, RColor *color);
 341
 342 void RDrawSegments(RImage *image, RSegment *segs, int nsegs, RColor *color);
 343
 344 void ROperateSegments(RImage *image, int operation, RSegment *segs, int nsegs,
 345                       RColor *color);
 346
 347 /*
 348  * Color convertion
 349  */
 350 void RRGBtoHSV(RColor *color, RHSVColor *hsv);
 351 void RHSVtoRGB(RHSVColor *hsv, RColor *rgb);
 352
 353 /*
 354  * Painting
 355  */
 356 void RClearImage(RImage *image, RColor *color);
 357
 358 void RBevelImage(RImage *image, int bevel_type);
 359
 360 RImage *RRenderGradient(unsigned width, unsigned height, RColor *from,
 361                         RColor *to, int style);
 362
 363
 364 RImage *RRenderMultiGradient(unsigned width, unsigned height, RColor **colors,
 365                              int style);
 366
 367
 368
 369 /*
 370  * Convertion into X Pixmaps
 371  */
 372 int RConvertImage(RContext *context, RImage *image, Pixmap *pixmap);
 373
 374 int RConvertImageMask(RContext *context, RImage *image, Pixmap *pixmap,
 375                       Pixmap *mask, int threshold);
 376
 377
 378 /*
 379  * misc. utilities
 380  */
 381 RXImage *RCreateXImage(RContext *context, int depth,
 382                        unsigned width, unsigned height);
 383
 384 RXImage *RGetXImage(RContext *context, Drawable d, int x, int y,
 385                     unsigned width, unsigned height);
 386
 387 void RDestroyXImage(RContext *context, RXImage *ximage);
 388
 389 void RPutXImage(RContext *context, Drawable d, GC gc, RXImage *ximage,
 390                 int src_x, int src_y, int dest_x, int dest_y,
 391                 unsigned width, unsigned height);
 392
 393 /* do not free the returned string! */
 394 const char *RMessageForError(int errorCode);
 395
 396 int RBlurImage(RImage *image);
 397
 398 /****** Global Variables *******/
 399
 400 extern int RErrorCode;
 401
 402 #ifdef __cplusplus
 403 }
 404 #endif /* __cplusplus */
 405
 406 #endif