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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ftimage.h */ | |
| 4 /* */ | |
| 5 /* FreeType glyph image formats and default raster interface */ | |
| 6 /* (specification). */ | |
| 7 /* */ | |
| 8 /* Copyright 1996-2010, 2013, 2014 by */ | |
| 9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 10 /* */ | |
| 11 /* This file is part of the FreeType project, and may only be used, */ | |
| 12 /* modified, and distributed under the terms of the FreeType project */ | |
| 13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 14 /* this file you indicate that you have read the license and */ | |
| 15 /* understand and accept it fully. */ | |
| 16 /* */ | |
| 17 /***************************************************************************/ | |
| 18 | |
| 19 /*************************************************************************/ | |
| 20 /* */ | |
| 21 /* Note: A `raster' is simply a scan-line converter, used to render */ | |
| 22 /* FT_Outlines into FT_Bitmaps. */ | |
| 23 /* */ | |
| 24 /*************************************************************************/ | |
| 25 | |
| 26 | |
| 27 #ifndef __FTIMAGE_H__ | |
| 28 #define __FTIMAGE_H__ | |
| 29 | |
| 30 | |
| 31 /* _STANDALONE_ is from ftgrays.c */ | |
| 32 #ifndef _STANDALONE_ | |
| 33 #include <ft2build.h> | |
| 34 #endif | |
| 35 | |
| 36 | |
| 37 FT_BEGIN_HEADER | |
| 38 | |
| 39 | |
| 40 /*************************************************************************/ | |
| 41 /* */ | |
| 42 /* <Section> */ | |
| 43 /* basic_types */ | |
| 44 /* */ | |
| 45 /*************************************************************************/ | |
| 46 | |
| 47 | |
| 48 /*************************************************************************/ | |
| 49 /* */ | |
| 50 /* <Type> */ | |
| 51 /* FT_Pos */ | |
| 52 /* */ | |
| 53 /* <Description> */ | |
| 54 /* The type FT_Pos is used to store vectorial coordinates. Depending */ | |
| 55 /* on the context, these can represent distances in integer font */ | |
| 56 /* units, or 16.16, or 26.6 fixed-point pixel coordinates. */ | |
| 57 /* */ | |
| 58 typedef signed long FT_Pos; | |
| 59 | |
| 60 | |
| 61 /*************************************************************************/ | |
| 62 /* */ | |
| 63 /* <Struct> */ | |
| 64 /* FT_Vector */ | |
| 65 /* */ | |
| 66 /* <Description> */ | |
| 67 /* A simple structure used to store a 2D vector; coordinates are of */ | |
| 68 /* the FT_Pos type. */ | |
| 69 /* */ | |
| 70 /* <Fields> */ | |
| 71 /* x :: The horizontal coordinate. */ | |
| 72 /* y :: The vertical coordinate. */ | |
| 73 /* */ | |
| 74 typedef struct FT_Vector_ | |
| 75 { | |
| 76 FT_Pos x; | |
| 77 FT_Pos y; | |
| 78 | |
| 79 } FT_Vector; | |
| 80 | |
| 81 | |
| 82 /*************************************************************************/ | |
| 83 /* */ | |
| 84 /* <Struct> */ | |
| 85 /* FT_BBox */ | |
| 86 /* */ | |
| 87 /* <Description> */ | |
| 88 /* A structure used to hold an outline's bounding box, i.e., the */ | |
| 89 /* coordinates of its extrema in the horizontal and vertical */ | |
| 90 /* directions. */ | |
| 91 /* */ | |
| 92 /* <Fields> */ | |
| 93 /* xMin :: The horizontal minimum (left-most). */ | |
| 94 /* */ | |
| 95 /* yMin :: The vertical minimum (bottom-most). */ | |
| 96 /* */ | |
| 97 /* xMax :: The horizontal maximum (right-most). */ | |
| 98 /* */ | |
| 99 /* yMax :: The vertical maximum (top-most). */ | |
| 100 /* */ | |
| 101 /* <Note> */ | |
| 102 /* The bounding box is specified with the coordinates of the lower */ | |
| 103 /* left and the upper right corner. In PostScript, those values are */ | |
| 104 /* often called (llx,lly) and (urx,ury), respectively. */ | |
| 105 /* */ | |
| 106 /* If `yMin' is negative, this value gives the glyph's descender. */ | |
| 107 /* Otherwise, the glyph doesn't descend below the baseline. */ | |
| 108 /* Similarly, if `ymax' is positive, this value gives the glyph's */ | |
| 109 /* ascender. */ | |
| 110 /* */ | |
| 111 /* `xMin' gives the horizontal distance from the glyph's origin to */ | |
| 112 /* the left edge of the glyph's bounding box. If `xMin' is negative, */ | |
| 113 /* the glyph extends to the left of the origin. */ | |
| 114 /* */ | |
| 115 typedef struct FT_BBox_ | |
| 116 { | |
| 117 FT_Pos xMin, yMin; | |
| 118 FT_Pos xMax, yMax; | |
| 119 | |
| 120 } FT_BBox; | |
| 121 | |
| 122 | |
| 123 /*************************************************************************/ | |
| 124 /* */ | |
| 125 /* <Enum> */ | |
| 126 /* FT_Pixel_Mode */ | |
| 127 /* */ | |
| 128 /* <Description> */ | |
| 129 /* An enumeration type used to describe the format of pixels in a */ | |
| 130 /* given bitmap. Note that additional formats may be added in the */ | |
| 131 /* future. */ | |
| 132 /* */ | |
| 133 /* <Values> */ | |
| 134 /* FT_PIXEL_MODE_NONE :: */ | |
| 135 /* Value~0 is reserved. */ | |
| 136 /* */ | |
| 137 /* FT_PIXEL_MODE_MONO :: */ | |
| 138 /* A monochrome bitmap, using 1~bit per pixel. Note that pixels */ | |
| 139 /* are stored in most-significant order (MSB), which means that */ | |
| 140 /* the left-most pixel in a byte has value 128. */ | |
| 141 /* */ | |
| 142 /* FT_PIXEL_MODE_GRAY :: */ | |
| 143 /* An 8-bit bitmap, generally used to represent anti-aliased glyph */ | |
| 144 /* images. Each pixel is stored in one byte. Note that the number */ | |
| 145 /* of `gray' levels is stored in the `num_grays' field of the */ | |
| 146 /* @FT_Bitmap structure (it generally is 256). */ | |
| 147 /* */ | |
| 148 /* FT_PIXEL_MODE_GRAY2 :: */ | |
| 149 /* A 2-bit per pixel bitmap, used to represent embedded */ | |
| 150 /* anti-aliased bitmaps in font files according to the OpenType */ | |
| 151 /* specification. We haven't found a single font using this */ | |
| 152 /* format, however. */ | |
| 153 /* */ | |
| 154 /* FT_PIXEL_MODE_GRAY4 :: */ | |
| 155 /* A 4-bit per pixel bitmap, representing embedded anti-aliased */ | |
| 156 /* bitmaps in font files according to the OpenType specification. */ | |
| 157 /* We haven't found a single font using this format, however. */ | |
| 158 /* */ | |
| 159 /* FT_PIXEL_MODE_LCD :: */ | |
| 160 /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */ | |
| 161 /* used for display on LCD displays; the bitmap is three times */ | |
| 162 /* wider than the original glyph image. See also */ | |
| 163 /* @FT_RENDER_MODE_LCD. */ | |
| 164 /* */ | |
| 165 /* FT_PIXEL_MODE_LCD_V :: */ | |
| 166 /* An 8-bit bitmap, representing RGB or BGR decimated glyph images */ | |
| 167 /* used for display on rotated LCD displays; the bitmap is three */ | |
| 168 /* times taller than the original glyph image. See also */ | |
| 169 /* @FT_RENDER_MODE_LCD_V. */ | |
| 170 /* */ | |
| 171 /* FT_PIXEL_MODE_BGRA :: */ | |
| 172 /* An image with four 8-bit channels per pixel, representing a */ | |
| 173 /* color image (such as emoticons) with alpha channel. For each */ | |
| 174 /* pixel, the format is BGRA, which means, the blue channel comes */ | |
| 175 /* first in memory. The color channels are pre-multiplied and in */ | |
| 176 /* the sRGB colorspace. For example, full red at half-translucent */ | |
| 177 /* opacity will be represented as `00,00,80,80', not `00,00,FF,80'. */ | |
| 178 /* See also @FT_LOAD_COLOR. */ | |
| 179 /* */ | |
| 180 typedef enum FT_Pixel_Mode_ | |
| 181 { | |
| 182 FT_PIXEL_MODE_NONE = 0, | |
| 183 FT_PIXEL_MODE_MONO, | |
| 184 FT_PIXEL_MODE_GRAY, | |
| 185 FT_PIXEL_MODE_GRAY2, | |
| 186 FT_PIXEL_MODE_GRAY4, | |
| 187 FT_PIXEL_MODE_LCD, | |
| 188 FT_PIXEL_MODE_LCD_V, | |
| 189 FT_PIXEL_MODE_BGRA, | |
| 190 | |
| 191 FT_PIXEL_MODE_MAX /* do not remove */ | |
| 192 | |
| 193 } FT_Pixel_Mode; | |
| 194 | |
| 195 | |
| 196 /* these constants are deprecated; use the corresponding `FT_Pixel_Mode' */ | |
| 197 /* values instead. */ | |
| 198 #define ft_pixel_mode_none FT_PIXEL_MODE_NONE | |
| 199 #define ft_pixel_mode_mono FT_PIXEL_MODE_MONO | |
| 200 #define ft_pixel_mode_grays FT_PIXEL_MODE_GRAY | |
| 201 #define ft_pixel_mode_pal2 FT_PIXEL_MODE_GRAY2 | |
| 202 #define ft_pixel_mode_pal4 FT_PIXEL_MODE_GRAY4 | |
| 203 | |
| 204 | |
| 205 /*************************************************************************/ | |
| 206 /* */ | |
| 207 /* <Struct> */ | |
| 208 /* FT_Bitmap */ | |
| 209 /* */ | |
| 210 /* <Description> */ | |
| 211 /* A structure used to describe a bitmap or pixmap to the raster. */ | |
| 212 /* Note that we now manage pixmaps of various depths through the */ | |
| 213 /* `pixel_mode' field. */ | |
| 214 /* */ | |
| 215 /* <Fields> */ | |
| 216 /* rows :: The number of bitmap rows. */ | |
| 217 /* */ | |
| 218 /* width :: The number of pixels in bitmap row. */ | |
| 219 /* */ | |
| 220 /* pitch :: The pitch's absolute value is the number of bytes */ | |
| 221 /* taken by one bitmap row, including padding. */ | |
| 222 /* However, the pitch is positive when the bitmap has */ | |
| 223 /* a `down' flow, and negative when it has an `up' */ | |
| 224 /* flow. In all cases, the pitch is an offset to add */ | |
| 225 /* to a bitmap pointer in order to go down one row. */ | |
| 226 /* */ | |
| 227 /* Note that `padding' means the alignment of a */ | |
| 228 /* bitmap to a byte border, and FreeType functions */ | |
| 229 /* normally align to the smallest possible integer */ | |
| 230 /* value. */ | |
| 231 /* */ | |
| 232 /* For the B/W rasterizer, `pitch' is always an even */ | |
| 233 /* number. */ | |
| 234 /* */ | |
| 235 /* To change the pitch of a bitmap (say, to make it a */ | |
| 236 /* multiple of 4), use @FT_Bitmap_Convert. */ | |
| 237 /* Alternatively, you might use callback functions to */ | |
| 238 /* directly render to the application's surface; see */ | |
| 239 /* the file `example2.cpp' in the tutorial for a */ | |
| 240 /* demonstration. */ | |
| 241 /* */ | |
| 242 /* buffer :: A typeless pointer to the bitmap buffer. This */ | |
| 243 /* value should be aligned on 32-bit boundaries in */ | |
| 244 /* most cases. */ | |
| 245 /* */ | |
| 246 /* num_grays :: This field is only used with */ | |
| 247 /* @FT_PIXEL_MODE_GRAY; it gives the number of gray */ | |
| 248 /* levels used in the bitmap. */ | |
| 249 /* */ | |
| 250 /* pixel_mode :: The pixel mode, i.e., how pixel bits are stored. */ | |
| 251 /* See @FT_Pixel_Mode for possible values. */ | |
| 252 /* */ | |
| 253 /* palette_mode :: This field is intended for paletted pixel modes; */ | |
| 254 /* it indicates how the palette is stored. Not */ | |
| 255 /* used currently. */ | |
| 256 /* */ | |
| 257 /* palette :: A typeless pointer to the bitmap palette; this */ | |
| 258 /* field is intended for paletted pixel modes. Not */ | |
| 259 /* used currently. */ | |
| 260 /* */ | |
| 261 /* <Note> */ | |
| 262 /* For now, the only pixel modes supported by FreeType are mono and */ | |
| 263 /* grays. However, drivers might be added in the future to support */ | |
| 264 /* more `colorful' options. */ | |
| 265 /* */ | |
| 266 typedef struct FT_Bitmap_ | |
| 267 { | |
| 268 unsigned int rows; | |
| 269 unsigned int width; | |
| 270 int pitch; | |
| 271 unsigned char* buffer; | |
| 272 unsigned short num_grays; | |
| 273 unsigned char pixel_mode; | |
| 274 unsigned char palette_mode; | |
| 275 void* palette; | |
| 276 | |
| 277 } FT_Bitmap; | |
| 278 | |
| 279 | |
| 280 /*************************************************************************/ | |
| 281 /* */ | |
| 282 /* <Section> */ | |
| 283 /* outline_processing */ | |
| 284 /* */ | |
| 285 /*************************************************************************/ | |
| 286 | |
| 287 | |
| 288 /*************************************************************************/ | |
| 289 /* */ | |
| 290 /* <Struct> */ | |
| 291 /* FT_Outline */ | |
| 292 /* */ | |
| 293 /* <Description> */ | |
| 294 /* This structure is used to describe an outline to the scan-line */ | |
| 295 /* converter. */ | |
| 296 /* */ | |
| 297 /* <Fields> */ | |
| 298 /* n_contours :: The number of contours in the outline. */ | |
| 299 /* */ | |
| 300 /* n_points :: The number of points in the outline. */ | |
| 301 /* */ | |
| 302 /* points :: A pointer to an array of `n_points' @FT_Vector */ | |
| 303 /* elements, giving the outline's point coordinates. */ | |
| 304 /* */ | |
| 305 /* tags :: A pointer to an array of `n_points' chars, giving */ | |
| 306 /* each outline point's type. */ | |
| 307 /* */ | |
| 308 /* If bit~0 is unset, the point is `off' the curve, */ | |
| 309 /* i.e., a Bézier control point, while it is `on' if */ | |
| 310 /* set. */ | |
| 311 /* */ | |
| 312 /* Bit~1 is meaningful for `off' points only. If set, */ | |
| 313 /* it indicates a third-order Bézier arc control point; */ | |
| 314 /* and a second-order control point if unset. */ | |
| 315 /* */ | |
| 316 /* If bit~2 is set, bits 5-7 contain the drop-out mode */ | |
| 317 /* (as defined in the OpenType specification; the value */ | |
| 318 /* is the same as the argument to the SCANMODE */ | |
| 319 /* instruction). */ | |
| 320 /* */ | |
| 321 /* Bits 3 and~4 are reserved for internal purposes. */ | |
| 322 /* */ | |
| 323 /* contours :: An array of `n_contours' shorts, giving the end */ | |
| 324 /* point of each contour within the outline. For */ | |
| 325 /* example, the first contour is defined by the points */ | |
| 326 /* `0' to `contours[0]', the second one is defined by */ | |
| 327 /* the points `contours[0]+1' to `contours[1]', etc. */ | |
| 328 /* */ | |
| 329 /* flags :: A set of bit flags used to characterize the outline */ | |
| 330 /* and give hints to the scan-converter and hinter on */ | |
| 331 /* how to convert/grid-fit it. See @FT_OUTLINE_XXX. */ | |
| 332 /* */ | |
| 333 /* <Note> */ | |
| 334 /* The B/W rasterizer only checks bit~2 in the `tags' array for the */ | |
| 335 /* first point of each contour. The drop-out mode as given with */ | |
| 336 /* @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, and */ | |
| 337 /* @FT_OUTLINE_INCLUDE_STUBS in `flags' is then overridden. */ | |
| 338 /* */ | |
| 339 typedef struct FT_Outline_ | |
| 340 { | |
| 341 short n_contours; /* number of contours in glyph */ | |
| 342 short n_points; /* number of points in the glyph */ | |
| 343 | |
| 344 FT_Vector* points; /* the outline's points */ | |
| 345 char* tags; /* the points flags */ | |
| 346 short* contours; /* the contour end points */ | |
| 347 | |
| 348 int flags; /* outline masks */ | |
| 349 | |
| 350 } FT_Outline; | |
| 351 | |
| 352 /* */ | |
| 353 | |
| 354 /* Following limits must be consistent with */ | |
| 355 /* FT_Outline.{n_contours,n_points} */ | |
| 356 #define FT_OUTLINE_CONTOURS_MAX SHRT_MAX | |
| 357 #define FT_OUTLINE_POINTS_MAX SHRT_MAX | |
| 358 | |
| 359 | |
| 360 /*************************************************************************/ | |
| 361 /* */ | |
| 362 /* <Enum> */ | |
| 363 /* FT_OUTLINE_XXX */ | |
| 364 /* */ | |
| 365 /* <Description> */ | |
| 366 /* A list of bit-field constants use for the flags in an outline's */ | |
| 367 /* `flags' field. */ | |
| 368 /* */ | |
| 369 /* <Values> */ | |
| 370 /* FT_OUTLINE_NONE :: */ | |
| 371 /* Value~0 is reserved. */ | |
| 372 /* */ | |
| 373 /* FT_OUTLINE_OWNER :: */ | |
| 374 /* If set, this flag indicates that the outline's field arrays */ | |
| 375 /* (i.e., `points', `flags', and `contours') are `owned' by the */ | |
| 376 /* outline object, and should thus be freed when it is destroyed. */ | |
| 377 /* */ | |
| 378 /* FT_OUTLINE_EVEN_ODD_FILL :: */ | |
| 379 /* By default, outlines are filled using the non-zero winding rule. */ | |
| 380 /* If set to 1, the outline will be filled using the even-odd fill */ | |
| 381 /* rule (only works with the smooth rasterizer). */ | |
| 382 /* */ | |
| 383 /* FT_OUTLINE_REVERSE_FILL :: */ | |
| 384 /* By default, outside contours of an outline are oriented in */ | |
| 385 /* clock-wise direction, as defined in the TrueType specification. */ | |
| 386 /* This flag is set if the outline uses the opposite direction */ | |
| 387 /* (typically for Type~1 fonts). This flag is ignored by the scan */ | |
| 388 /* converter. */ | |
| 389 /* */ | |
| 390 /* FT_OUTLINE_IGNORE_DROPOUTS :: */ | |
| 391 /* By default, the scan converter will try to detect drop-outs in */ | |
| 392 /* an outline and correct the glyph bitmap to ensure consistent */ | |
| 393 /* shape continuity. If set, this flag hints the scan-line */ | |
| 394 /* converter to ignore such cases. See below for more information. */ | |
| 395 /* */ | |
| 396 /* FT_OUTLINE_SMART_DROPOUTS :: */ | |
| 397 /* Select smart dropout control. If unset, use simple dropout */ | |
| 398 /* control. Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See */ | |
| 399 /* below for more information. */ | |
| 400 /* */ | |
| 401 /* FT_OUTLINE_INCLUDE_STUBS :: */ | |
| 402 /* If set, turn pixels on for `stubs', otherwise exclude them. */ | |
| 403 /* Ignored if @FT_OUTLINE_IGNORE_DROPOUTS is set. See below for */ | |
| 404 /* more information. */ | |
| 405 /* */ | |
| 406 /* FT_OUTLINE_HIGH_PRECISION :: */ | |
| 407 /* This flag indicates that the scan-line converter should try to */ | |
| 408 /* convert this outline to bitmaps with the highest possible */ | |
| 409 /* quality. It is typically set for small character sizes. Note */ | |
| 410 /* that this is only a hint that might be completely ignored by a */ | |
| 411 /* given scan-converter. */ | |
| 412 /* */ | |
| 413 /* FT_OUTLINE_SINGLE_PASS :: */ | |
| 414 /* This flag is set to force a given scan-converter to only use a */ | |
| 415 /* single pass over the outline to render a bitmap glyph image. */ | |
| 416 /* Normally, it is set for very large character sizes. It is only */ | |
| 417 /* a hint that might be completely ignored by a given */ | |
| 418 /* scan-converter. */ | |
| 419 /* */ | |
| 420 /* <Note> */ | |
| 421 /* The flags @FT_OUTLINE_IGNORE_DROPOUTS, @FT_OUTLINE_SMART_DROPOUTS, */ | |
| 422 /* and @FT_OUTLINE_INCLUDE_STUBS are ignored by the smooth */ | |
| 423 /* rasterizer. */ | |
| 424 /* */ | |
| 425 /* There exists a second mechanism to pass the drop-out mode to the */ | |
| 426 /* B/W rasterizer; see the `tags' field in @FT_Outline. */ | |
| 427 /* */ | |
| 428 /* Please refer to the description of the `SCANTYPE' instruction in */ | |
| 429 /* the OpenType specification (in file `ttinst1.doc') how simple */ | |
| 430 /* drop-outs, smart drop-outs, and stubs are defined. */ | |
| 431 /* */ | |
| 432 #define FT_OUTLINE_NONE 0x0 | |
| 433 #define FT_OUTLINE_OWNER 0x1 | |
| 434 #define FT_OUTLINE_EVEN_ODD_FILL 0x2 | |
| 435 #define FT_OUTLINE_REVERSE_FILL 0x4 | |
| 436 #define FT_OUTLINE_IGNORE_DROPOUTS 0x8 | |
| 437 #define FT_OUTLINE_SMART_DROPOUTS 0x10 | |
| 438 #define FT_OUTLINE_INCLUDE_STUBS 0x20 | |
| 439 | |
| 440 #define FT_OUTLINE_HIGH_PRECISION 0x100 | |
| 441 #define FT_OUTLINE_SINGLE_PASS 0x200 | |
| 442 | |
| 443 | |
| 444 /* these constants are deprecated; use the corresponding */ | |
| 445 /* `FT_OUTLINE_XXX' values instead */ | |
| 446 #define ft_outline_none FT_OUTLINE_NONE | |
| 447 #define ft_outline_owner FT_OUTLINE_OWNER | |
| 448 #define ft_outline_even_odd_fill FT_OUTLINE_EVEN_ODD_FILL | |
| 449 #define ft_outline_reverse_fill FT_OUTLINE_REVERSE_FILL | |
| 450 #define ft_outline_ignore_dropouts FT_OUTLINE_IGNORE_DROPOUTS | |
| 451 #define ft_outline_high_precision FT_OUTLINE_HIGH_PRECISION | |
| 452 #define ft_outline_single_pass FT_OUTLINE_SINGLE_PASS | |
| 453 | |
| 454 /* */ | |
| 455 | |
| 456 #define FT_CURVE_TAG( flag ) ( flag & 3 ) | |
| 457 | |
| 458 #define FT_CURVE_TAG_ON 1 | |
| 459 #define FT_CURVE_TAG_CONIC 0 | |
| 460 #define FT_CURVE_TAG_CUBIC 2 | |
| 461 | |
| 462 #define FT_CURVE_TAG_HAS_SCANMODE 4 | |
| 463 | |
| 464 #define FT_CURVE_TAG_TOUCH_X 8 /* reserved for the TrueType hinter */ | |
| 465 #define FT_CURVE_TAG_TOUCH_Y 16 /* reserved for the TrueType hinter */ | |
| 466 | |
| 467 #define FT_CURVE_TAG_TOUCH_BOTH ( FT_CURVE_TAG_TOUCH_X | \ | |
| 468 FT_CURVE_TAG_TOUCH_Y ) | |
| 469 | |
| 470 #define FT_Curve_Tag_On FT_CURVE_TAG_ON | |
| 471 #define FT_Curve_Tag_Conic FT_CURVE_TAG_CONIC | |
| 472 #define FT_Curve_Tag_Cubic FT_CURVE_TAG_CUBIC | |
| 473 #define FT_Curve_Tag_Touch_X FT_CURVE_TAG_TOUCH_X | |
| 474 #define FT_Curve_Tag_Touch_Y FT_CURVE_TAG_TOUCH_Y | |
| 475 | |
| 476 | |
| 477 /*************************************************************************/ | |
| 478 /* */ | |
| 479 /* <FuncType> */ | |
| 480 /* FT_Outline_MoveToFunc */ | |
| 481 /* */ | |
| 482 /* <Description> */ | |
| 483 /* A function pointer type used to describe the signature of a `move */ | |
| 484 /* to' function during outline walking/decomposition. */ | |
| 485 /* */ | |
| 486 /* A `move to' is emitted to start a new contour in an outline. */ | |
| 487 /* */ | |
| 488 /* <Input> */ | |
| 489 /* to :: A pointer to the target point of the `move to'. */ | |
| 490 /* */ | |
| 491 /* user :: A typeless pointer, which is passed from the caller of the */ | |
| 492 /* decomposition function. */ | |
| 493 /* */ | |
| 494 /* <Return> */ | |
| 495 /* Error code. 0~means success. */ | |
| 496 /* */ | |
| 497 typedef int | |
| 498 (*FT_Outline_MoveToFunc)( const FT_Vector* to, | |
| 499 void* user ); | |
| 500 | |
| 501 #define FT_Outline_MoveTo_Func FT_Outline_MoveToFunc | |
| 502 | |
| 503 | |
| 504 /*************************************************************************/ | |
| 505 /* */ | |
| 506 /* <FuncType> */ | |
| 507 /* FT_Outline_LineToFunc */ | |
| 508 /* */ | |
| 509 /* <Description> */ | |
| 510 /* A function pointer type used to describe the signature of a `line */ | |
| 511 /* to' function during outline walking/decomposition. */ | |
| 512 /* */ | |
| 513 /* A `line to' is emitted to indicate a segment in the outline. */ | |
| 514 /* */ | |
| 515 /* <Input> */ | |
| 516 /* to :: A pointer to the target point of the `line to'. */ | |
| 517 /* */ | |
| 518 /* user :: A typeless pointer, which is passed from the caller of the */ | |
| 519 /* decomposition function. */ | |
| 520 /* */ | |
| 521 /* <Return> */ | |
| 522 /* Error code. 0~means success. */ | |
| 523 /* */ | |
| 524 typedef int | |
| 525 (*FT_Outline_LineToFunc)( const FT_Vector* to, | |
| 526 void* user ); | |
| 527 | |
| 528 #define FT_Outline_LineTo_Func FT_Outline_LineToFunc | |
| 529 | |
| 530 | |
| 531 /*************************************************************************/ | |
| 532 /* */ | |
| 533 /* <FuncType> */ | |
| 534 /* FT_Outline_ConicToFunc */ | |
| 535 /* */ | |
| 536 /* <Description> */ | |
| 537 /* A function pointer type used to describe the signature of a `conic */ | |
| 538 /* to' function during outline walking or decomposition. */ | |
| 539 /* */ | |
| 540 /* A `conic to' is emitted to indicate a second-order Bézier arc in */ | |
| 541 /* the outline. */ | |
| 542 /* */ | |
| 543 /* <Input> */ | |
| 544 /* control :: An intermediate control point between the last position */ | |
| 545 /* and the new target in `to'. */ | |
| 546 /* */ | |
| 547 /* to :: A pointer to the target end point of the conic arc. */ | |
| 548 /* */ | |
| 549 /* user :: A typeless pointer, which is passed from the caller of */ | |
| 550 /* the decomposition function. */ | |
| 551 /* */ | |
| 552 /* <Return> */ | |
| 553 /* Error code. 0~means success. */ | |
| 554 /* */ | |
| 555 typedef int | |
| 556 (*FT_Outline_ConicToFunc)( const FT_Vector* control, | |
| 557 const FT_Vector* to, | |
| 558 void* user ); | |
| 559 | |
| 560 #define FT_Outline_ConicTo_Func FT_Outline_ConicToFunc | |
| 561 | |
| 562 | |
| 563 /*************************************************************************/ | |
| 564 /* */ | |
| 565 /* <FuncType> */ | |
| 566 /* FT_Outline_CubicToFunc */ | |
| 567 /* */ | |
| 568 /* <Description> */ | |
| 569 /* A function pointer type used to describe the signature of a `cubic */ | |
| 570 /* to' function during outline walking or decomposition. */ | |
| 571 /* */ | |
| 572 /* A `cubic to' is emitted to indicate a third-order Bézier arc. */ | |
| 573 /* */ | |
| 574 /* <Input> */ | |
| 575 /* control1 :: A pointer to the first Bézier control point. */ | |
| 576 /* */ | |
| 577 /* control2 :: A pointer to the second Bézier control point. */ | |
| 578 /* */ | |
| 579 /* to :: A pointer to the target end point. */ | |
| 580 /* */ | |
| 581 /* user :: A typeless pointer, which is passed from the caller of */ | |
| 582 /* the decomposition function. */ | |
| 583 /* */ | |
| 584 /* <Return> */ | |
| 585 /* Error code. 0~means success. */ | |
| 586 /* */ | |
| 587 typedef int | |
| 588 (*FT_Outline_CubicToFunc)( const FT_Vector* control1, | |
| 589 const FT_Vector* control2, | |
| 590 const FT_Vector* to, | |
| 591 void* user ); | |
| 592 | |
| 593 #define FT_Outline_CubicTo_Func FT_Outline_CubicToFunc | |
| 594 | |
| 595 | |
| 596 /*************************************************************************/ | |
| 597 /* */ | |
| 598 /* <Struct> */ | |
| 599 /* FT_Outline_Funcs */ | |
| 600 /* */ | |
| 601 /* <Description> */ | |
| 602 /* A structure to hold various function pointers used during outline */ | |
| 603 /* decomposition in order to emit segments, conic, and cubic Béziers. */ | |
| 604 /* */ | |
| 605 /* <Fields> */ | |
| 606 /* move_to :: The `move to' emitter. */ | |
| 607 /* */ | |
| 608 /* line_to :: The segment emitter. */ | |
| 609 /* */ | |
| 610 /* conic_to :: The second-order Bézier arc emitter. */ | |
| 611 /* */ | |
| 612 /* cubic_to :: The third-order Bézier arc emitter. */ | |
| 613 /* */ | |
| 614 /* shift :: The shift that is applied to coordinates before they */ | |
| 615 /* are sent to the emitter. */ | |
| 616 /* */ | |
| 617 /* delta :: The delta that is applied to coordinates before they */ | |
| 618 /* are sent to the emitter, but after the shift. */ | |
| 619 /* */ | |
| 620 /* <Note> */ | |
| 621 /* The point coordinates sent to the emitters are the transformed */ | |
| 622 /* version of the original coordinates (this is important for high */ | |
| 623 /* accuracy during scan-conversion). The transformation is simple: */ | |
| 624 /* */ | |
| 625 /* { */ | |
| 626 /* x' = (x << shift) - delta */ | |
| 627 /* y' = (x << shift) - delta */ | |
| 628 /* } */ | |
| 629 /* */ | |
| 630 /* Set the values of `shift' and `delta' to~0 to get the original */ | |
| 631 /* point coordinates. */ | |
| 632 /* */ | |
| 633 typedef struct FT_Outline_Funcs_ | |
| 634 { | |
| 635 FT_Outline_MoveToFunc move_to; | |
| 636 FT_Outline_LineToFunc line_to; | |
| 637 FT_Outline_ConicToFunc conic_to; | |
| 638 FT_Outline_CubicToFunc cubic_to; | |
| 639 | |
| 640 int shift; | |
| 641 FT_Pos delta; | |
| 642 | |
| 643 } FT_Outline_Funcs; | |
| 644 | |
| 645 | |
| 646 /*************************************************************************/ | |
| 647 /* */ | |
| 648 /* <Section> */ | |
| 649 /* basic_types */ | |
| 650 /* */ | |
| 651 /*************************************************************************/ | |
| 652 | |
| 653 | |
| 654 /*************************************************************************/ | |
| 655 /* */ | |
| 656 /* <Macro> */ | |
| 657 /* FT_IMAGE_TAG */ | |
| 658 /* */ | |
| 659 /* <Description> */ | |
| 660 /* This macro converts four-letter tags to an unsigned long type. */ | |
| 661 /* */ | |
| 662 /* <Note> */ | |
| 663 /* Since many 16-bit compilers don't like 32-bit enumerations, you */ | |
| 664 /* should redefine this macro in case of problems to something like */ | |
| 665 /* this: */ | |
| 666 /* */ | |
| 667 /* { */ | |
| 668 /* #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) value */ | |
| 669 /* } */ | |
| 670 /* */ | |
| 671 /* to get a simple enumeration without assigning special numbers. */ | |
| 672 /* */ | |
| 673 #ifndef FT_IMAGE_TAG | |
| 674 #define FT_IMAGE_TAG( value, _x1, _x2, _x3, _x4 ) \ | |
| 675 value = ( ( (unsigned long)_x1 << 24 ) | \ | |
| 676 ( (unsigned long)_x2 << 16 ) | \ | |
| 677 ( (unsigned long)_x3 << 8 ) | \ | |
| 678 (unsigned long)_x4 ) | |
| 679 #endif /* FT_IMAGE_TAG */ | |
| 680 | |
| 681 | |
| 682 /*************************************************************************/ | |
| 683 /* */ | |
| 684 /* <Enum> */ | |
| 685 /* FT_Glyph_Format */ | |
| 686 /* */ | |
| 687 /* <Description> */ | |
| 688 /* An enumeration type used to describe the format of a given glyph */ | |
| 689 /* image. Note that this version of FreeType only supports two image */ | |
| 690 /* formats, even though future font drivers will be able to register */ | |
| 691 /* their own format. */ | |
| 692 /* */ | |
| 693 /* <Values> */ | |
| 694 /* FT_GLYPH_FORMAT_NONE :: */ | |
| 695 /* The value~0 is reserved. */ | |
| 696 /* */ | |
| 697 /* FT_GLYPH_FORMAT_COMPOSITE :: */ | |
| 698 /* The glyph image is a composite of several other images. This */ | |
| 699 /* format is _only_ used with @FT_LOAD_NO_RECURSE, and is used to */ | |
| 700 /* report compound glyphs (like accented characters). */ | |
| 701 /* */ | |
| 702 /* FT_GLYPH_FORMAT_BITMAP :: */ | |
| 703 /* The glyph image is a bitmap, and can be described as an */ | |
| 704 /* @FT_Bitmap. You generally need to access the `bitmap' field of */ | |
| 705 /* the @FT_GlyphSlotRec structure to read it. */ | |
| 706 /* */ | |
| 707 /* FT_GLYPH_FORMAT_OUTLINE :: */ | |
| 708 /* The glyph image is a vectorial outline made of line segments */ | |
| 709 /* and Bézier arcs; it can be described as an @FT_Outline; you */ | |
| 710 /* generally want to access the `outline' field of the */ | |
| 711 /* @FT_GlyphSlotRec structure to read it. */ | |
| 712 /* */ | |
| 713 /* FT_GLYPH_FORMAT_PLOTTER :: */ | |
| 714 /* The glyph image is a vectorial path with no inside and outside */ | |
| 715 /* contours. Some Type~1 fonts, like those in the Hershey family, */ | |
| 716 /* contain glyphs in this format. These are described as */ | |
| 717 /* @FT_Outline, but FreeType isn't currently capable of rendering */ | |
| 718 /* them correctly. */ | |
| 719 /* */ | |
| 720 typedef enum FT_Glyph_Format_ | |
| 721 { | |
| 722 FT_IMAGE_TAG( FT_GLYPH_FORMAT_NONE, 0, 0, 0, 0 ), | |
| 723 | |
| 724 FT_IMAGE_TAG( FT_GLYPH_FORMAT_COMPOSITE, 'c', 'o', 'm', 'p' ), | |
| 725 FT_IMAGE_TAG( FT_GLYPH_FORMAT_BITMAP, 'b', 'i', 't', 's' ), | |
| 726 FT_IMAGE_TAG( FT_GLYPH_FORMAT_OUTLINE, 'o', 'u', 't', 'l' ), | |
| 727 FT_IMAGE_TAG( FT_GLYPH_FORMAT_PLOTTER, 'p', 'l', 'o', 't' ) | |
| 728 | |
| 729 } FT_Glyph_Format; | |
| 730 | |
| 731 | |
| 732 /* these constants are deprecated; use the corresponding */ | |
| 733 /* `FT_Glyph_Format' values instead. */ | |
| 734 #define ft_glyph_format_none FT_GLYPH_FORMAT_NONE | |
| 735 #define ft_glyph_format_composite FT_GLYPH_FORMAT_COMPOSITE | |
| 736 #define ft_glyph_format_bitmap FT_GLYPH_FORMAT_BITMAP | |
| 737 #define ft_glyph_format_outline FT_GLYPH_FORMAT_OUTLINE | |
| 738 #define ft_glyph_format_plotter FT_GLYPH_FORMAT_PLOTTER | |
| 739 | |
| 740 | |
| 741 /*************************************************************************/ | |
| 742 /*************************************************************************/ | |
| 743 /*************************************************************************/ | |
| 744 /***** *****/ | |
| 745 /***** R A S T E R D E F I N I T I O N S *****/ | |
| 746 /***** *****/ | |
| 747 /*************************************************************************/ | |
| 748 /*************************************************************************/ | |
| 749 /*************************************************************************/ | |
| 750 | |
| 751 | |
| 752 /*************************************************************************/ | |
| 753 /* */ | |
| 754 /* A raster is a scan converter, in charge of rendering an outline into */ | |
| 755 /* a a bitmap. This section contains the public API for rasters. */ | |
| 756 /* */ | |
| 757 /* Note that in FreeType 2, all rasters are now encapsulated within */ | |
| 758 /* specific modules called `renderers'. See `ftrender.h' for more */ | |
| 759 /* details on renderers. */ | |
| 760 /* */ | |
| 761 /*************************************************************************/ | |
| 762 | |
| 763 | |
| 764 /*************************************************************************/ | |
| 765 /* */ | |
| 766 /* <Section> */ | |
| 767 /* raster */ | |
| 768 /* */ | |
| 769 /* <Title> */ | |
| 770 /* Scanline Converter */ | |
| 771 /* */ | |
| 772 /* <Abstract> */ | |
| 773 /* How vectorial outlines are converted into bitmaps and pixmaps. */ | |
| 774 /* */ | |
| 775 /* <Description> */ | |
| 776 /* This section contains technical definitions. */ | |
| 777 /* */ | |
| 778 /* <Order> */ | |
| 779 /* FT_Raster */ | |
| 780 /* FT_Span */ | |
| 781 /* FT_SpanFunc */ | |
| 782 /* */ | |
| 783 /* FT_Raster_Params */ | |
| 784 /* FT_RASTER_FLAG_XXX */ | |
| 785 /* */ | |
| 786 /* FT_Raster_NewFunc */ | |
| 787 /* FT_Raster_DoneFunc */ | |
| 788 /* FT_Raster_ResetFunc */ | |
| 789 /* FT_Raster_SetModeFunc */ | |
| 790 /* FT_Raster_RenderFunc */ | |
| 791 /* FT_Raster_Funcs */ | |
| 792 /* */ | |
| 793 /*************************************************************************/ | |
| 794 | |
| 795 | |
| 796 /*************************************************************************/ | |
| 797 /* */ | |
| 798 /* <Type> */ | |
| 799 /* FT_Raster */ | |
| 800 /* */ | |
| 801 /* <Description> */ | |
| 802 /* An opaque handle (pointer) to a raster object. Each object can be */ | |
| 803 /* used independently to convert an outline into a bitmap or pixmap. */ | |
| 804 /* */ | |
| 805 typedef struct FT_RasterRec_* FT_Raster; | |
| 806 | |
| 807 | |
| 808 /*************************************************************************/ | |
| 809 /* */ | |
| 810 /* <Struct> */ | |
| 811 /* FT_Span */ | |
| 812 /* */ | |
| 813 /* <Description> */ | |
| 814 /* A structure used to model a single span of gray pixels when */ | |
| 815 /* rendering an anti-aliased bitmap. */ | |
| 816 /* */ | |
| 817 /* <Fields> */ | |
| 818 /* x :: The span's horizontal start position. */ | |
| 819 /* */ | |
| 820 /* len :: The span's length in pixels. */ | |
| 821 /* */ | |
| 822 /* coverage :: The span color/coverage, ranging from 0 (background) */ | |
| 823 /* to 255 (foreground). */ | |
| 824 /* */ | |
| 825 /* <Note> */ | |
| 826 /* This structure is used by the span drawing callback type named */ | |
| 827 /* @FT_SpanFunc that takes the y~coordinate of the span as a */ | |
| 828 /* parameter. */ | |
| 829 /* */ | |
| 830 /* The coverage value is always between 0 and 255. If you want less */ | |
| 831 /* gray values, the callback function has to reduce them. */ | |
| 832 /* */ | |
| 833 typedef struct FT_Span_ | |
| 834 { | |
| 835 short x; | |
| 836 unsigned short len; | |
| 837 unsigned char coverage; | |
| 838 | |
| 839 } FT_Span; | |
| 840 | |
| 841 | |
| 842 /*************************************************************************/ | |
| 843 /* */ | |
| 844 /* <FuncType> */ | |
| 845 /* FT_SpanFunc */ | |
| 846 /* */ | |
| 847 /* <Description> */ | |
| 848 /* A function used as a call-back by the anti-aliased renderer in */ | |
| 849 /* order to let client applications draw themselves the gray pixel */ | |
| 850 /* spans on each scan line. */ | |
| 851 /* */ | |
| 852 /* <Input> */ | |
| 853 /* y :: The scanline's y~coordinate. */ | |
| 854 /* */ | |
| 855 /* count :: The number of spans to draw on this scanline. */ | |
| 856 /* */ | |
| 857 /* spans :: A table of `count' spans to draw on the scanline. */ | |
| 858 /* */ | |
| 859 /* user :: User-supplied data that is passed to the callback. */ | |
| 860 /* */ | |
| 861 /* <Note> */ | |
| 862 /* This callback allows client applications to directly render the */ | |
| 863 /* gray spans of the anti-aliased bitmap to any kind of surfaces. */ | |
| 864 /* */ | |
| 865 /* This can be used to write anti-aliased outlines directly to a */ | |
| 866 /* given background bitmap, and even perform translucency. */ | |
| 867 /* */ | |
| 868 /* Note that the `count' field cannot be greater than a fixed value */ | |
| 869 /* defined by the `FT_MAX_GRAY_SPANS' configuration macro in */ | |
| 870 /* `ftoption.h'. By default, this value is set to~32, which means */ | |
| 871 /* that if there are more than 32~spans on a given scanline, the */ | |
| 872 /* callback is called several times with the same `y' parameter in */ | |
| 873 /* order to draw all callbacks. */ | |
| 874 /* */ | |
| 875 /* Otherwise, the callback is only called once per scan-line, and */ | |
| 876 /* only for those scanlines that do have `gray' pixels on them. */ | |
| 877 /* */ | |
| 878 typedef void | |
| 879 (*FT_SpanFunc)( int y, | |
| 880 int count, | |
| 881 const FT_Span* spans, | |
| 882 void* user ); | |
| 883 | |
| 884 #define FT_Raster_Span_Func FT_SpanFunc | |
| 885 | |
| 886 | |
| 887 /*************************************************************************/ | |
| 888 /* */ | |
| 889 /* <FuncType> */ | |
| 890 /* FT_Raster_BitTest_Func */ | |
| 891 /* */ | |
| 892 /* <Description> */ | |
| 893 /* Deprecated, unimplemented. */ | |
| 894 /* */ | |
| 895 typedef int | |
| 896 (*FT_Raster_BitTest_Func)( int y, | |
| 897 int x, | |
| 898 void* user ); | |
| 899 | |
| 900 | |
| 901 /*************************************************************************/ | |
| 902 /* */ | |
| 903 /* <FuncType> */ | |
| 904 /* FT_Raster_BitSet_Func */ | |
| 905 /* */ | |
| 906 /* <Description> */ | |
| 907 /* Deprecated, unimplemented. */ | |
| 908 /* */ | |
| 909 typedef void | |
| 910 (*FT_Raster_BitSet_Func)( int y, | |
| 911 int x, | |
| 912 void* user ); | |
| 913 | |
| 914 | |
| 915 /*************************************************************************/ | |
| 916 /* */ | |
| 917 /* <Enum> */ | |
| 918 /* FT_RASTER_FLAG_XXX */ | |
| 919 /* */ | |
| 920 /* <Description> */ | |
| 921 /* A list of bit flag constants as used in the `flags' field of a */ | |
| 922 /* @FT_Raster_Params structure. */ | |
| 923 /* */ | |
| 924 /* <Values> */ | |
| 925 /* FT_RASTER_FLAG_DEFAULT :: This value is 0. */ | |
| 926 /* */ | |
| 927 /* FT_RASTER_FLAG_AA :: This flag is set to indicate that an */ | |
| 928 /* anti-aliased glyph image should be */ | |
| 929 /* generated. Otherwise, it will be */ | |
| 930 /* monochrome (1-bit). */ | |
| 931 /* */ | |
| 932 /* FT_RASTER_FLAG_DIRECT :: This flag is set to indicate direct */ | |
| 933 /* rendering. In this mode, client */ | |
| 934 /* applications must provide their own span */ | |
| 935 /* callback. This lets them directly */ | |
| 936 /* draw or compose over an existing bitmap. */ | |
| 937 /* If this bit is not set, the target */ | |
| 938 /* pixmap's buffer _must_ be zeroed before */ | |
| 939 /* rendering. */ | |
| 940 /* */ | |
| 941 /* Direct rendering is only possible with */ | |
| 942 /* anti-aliased glyphs. */ | |
| 943 /* */ | |
| 944 /* FT_RASTER_FLAG_CLIP :: This flag is only used in direct */ | |
| 945 /* rendering mode. If set, the output will */ | |
| 946 /* be clipped to a box specified in the */ | |
| 947 /* `clip_box' field of the */ | |
| 948 /* @FT_Raster_Params structure. */ | |
| 949 /* */ | |
| 950 /* Note that by default, the glyph bitmap */ | |
| 951 /* is clipped to the target pixmap, except */ | |
| 952 /* in direct rendering mode where all spans */ | |
| 953 /* are generated if no clipping box is set. */ | |
| 954 /* */ | |
| 955 #define FT_RASTER_FLAG_DEFAULT 0x0 | |
| 956 #define FT_RASTER_FLAG_AA 0x1 | |
| 957 #define FT_RASTER_FLAG_DIRECT 0x2 | |
| 958 #define FT_RASTER_FLAG_CLIP 0x4 | |
| 959 | |
| 960 /* these constants are deprecated; use the corresponding */ | |
| 961 /* `FT_RASTER_FLAG_XXX' values instead */ | |
| 962 #define ft_raster_flag_default FT_RASTER_FLAG_DEFAULT | |
| 963 #define ft_raster_flag_aa FT_RASTER_FLAG_AA | |
| 964 #define ft_raster_flag_direct FT_RASTER_FLAG_DIRECT | |
| 965 #define ft_raster_flag_clip FT_RASTER_FLAG_CLIP | |
| 966 | |
| 967 | |
| 968 /*************************************************************************/ | |
| 969 /* */ | |
| 970 /* <Struct> */ | |
| 971 /* FT_Raster_Params */ | |
| 972 /* */ | |
| 973 /* <Description> */ | |
| 974 /* A structure to hold the arguments used by a raster's render */ | |
| 975 /* function. */ | |
| 976 /* */ | |
| 977 /* <Fields> */ | |
| 978 /* target :: The target bitmap. */ | |
| 979 /* */ | |
| 980 /* source :: A pointer to the source glyph image (e.g., an */ | |
| 981 /* @FT_Outline). */ | |
| 982 /* */ | |
| 983 /* flags :: The rendering flags. */ | |
| 984 /* */ | |
| 985 /* gray_spans :: The gray span drawing callback. */ | |
| 986 /* */ | |
| 987 /* black_spans :: Unused. */ | |
| 988 /* */ | |
| 989 /* bit_test :: Unused. */ | |
| 990 /* */ | |
| 991 /* bit_set :: Unused. */ | |
| 992 /* */ | |
| 993 /* user :: User-supplied data that is passed to each drawing */ | |
| 994 /* callback. */ | |
| 995 /* */ | |
| 996 /* clip_box :: An optional clipping box. It is only used in */ | |
| 997 /* direct rendering mode. Note that coordinates here */ | |
| 998 /* should be expressed in _integer_ pixels (and not in */ | |
| 999 /* 26.6 fixed-point units). */ | |
| 1000 /* */ | |
| 1001 /* <Note> */ | |
| 1002 /* An anti-aliased glyph bitmap is drawn if the @FT_RASTER_FLAG_AA */ | |
| 1003 /* bit flag is set in the `flags' field, otherwise a monochrome */ | |
| 1004 /* bitmap is generated. */ | |
| 1005 /* */ | |
| 1006 /* If the @FT_RASTER_FLAG_DIRECT bit flag is set in `flags', the */ | |
| 1007 /* raster will call the `gray_spans' callback to draw gray pixel */ | |
| 1008 /* spans. This allows direct composition over a pre-existing bitmap */ | |
| 1009 /* through user-provided callbacks to perform the span drawing and */ | |
| 1010 /* composition. Not supported by the monochrome rasterizer. */ | |
| 1011 /* */ | |
| 1012 typedef struct FT_Raster_Params_ | |
| 1013 { | |
| 1014 const FT_Bitmap* target; | |
| 1015 const void* source; | |
| 1016 int flags; | |
| 1017 FT_SpanFunc gray_spans; | |
| 1018 FT_SpanFunc black_spans; /* unused */ | |
| 1019 FT_Raster_BitTest_Func bit_test; /* unused */ | |
| 1020 FT_Raster_BitSet_Func bit_set; /* unused */ | |
| 1021 void* user; | |
| 1022 FT_BBox clip_box; | |
| 1023 | |
| 1024 } FT_Raster_Params; | |
| 1025 | |
| 1026 | |
| 1027 /*************************************************************************/ | |
| 1028 /* */ | |
| 1029 /* <FuncType> */ | |
| 1030 /* FT_Raster_NewFunc */ | |
| 1031 /* */ | |
| 1032 /* <Description> */ | |
| 1033 /* A function used to create a new raster object. */ | |
| 1034 /* */ | |
| 1035 /* <Input> */ | |
| 1036 /* memory :: A handle to the memory allocator. */ | |
| 1037 /* */ | |
| 1038 /* <Output> */ | |
| 1039 /* raster :: A handle to the new raster object. */ | |
| 1040 /* */ | |
| 1041 /* <Return> */ | |
| 1042 /* Error code. 0~means success. */ | |
| 1043 /* */ | |
| 1044 /* <Note> */ | |
| 1045 /* The `memory' parameter is a typeless pointer in order to avoid */ | |
| 1046 /* un-wanted dependencies on the rest of the FreeType code. In */ | |
| 1047 /* practice, it is an @FT_Memory object, i.e., a handle to the */ | |
| 1048 /* standard FreeType memory allocator. However, this field can be */ | |
| 1049 /* completely ignored by a given raster implementation. */ | |
| 1050 /* */ | |
| 1051 typedef int | |
| 1052 (*FT_Raster_NewFunc)( void* memory, | |
| 1053 FT_Raster* raster ); | |
| 1054 | |
| 1055 #define FT_Raster_New_Func FT_Raster_NewFunc | |
| 1056 | |
| 1057 | |
| 1058 /*************************************************************************/ | |
| 1059 /* */ | |
| 1060 /* <FuncType> */ | |
| 1061 /* FT_Raster_DoneFunc */ | |
| 1062 /* */ | |
| 1063 /* <Description> */ | |
| 1064 /* A function used to destroy a given raster object. */ | |
| 1065 /* */ | |
| 1066 /* <Input> */ | |
| 1067 /* raster :: A handle to the raster object. */ | |
| 1068 /* */ | |
| 1069 typedef void | |
| 1070 (*FT_Raster_DoneFunc)( FT_Raster raster ); | |
| 1071 | |
| 1072 #define FT_Raster_Done_Func FT_Raster_DoneFunc | |
| 1073 | |
| 1074 | |
| 1075 /*************************************************************************/ | |
| 1076 /* */ | |
| 1077 /* <FuncType> */ | |
| 1078 /* FT_Raster_ResetFunc */ | |
| 1079 /* */ | |
| 1080 /* <Description> */ | |
| 1081 /* FreeType provides an area of memory called the `render pool', */ | |
| 1082 /* available to all registered rasters. This pool can be freely used */ | |
| 1083 /* during a given scan-conversion but is shared by all rasters. Its */ | |
| 1084 /* content is thus transient. */ | |
| 1085 /* */ | |
| 1086 /* This function is called each time the render pool changes, or just */ | |
| 1087 /* after a new raster object is created. */ | |
| 1088 /* */ | |
| 1089 /* <Input> */ | |
| 1090 /* raster :: A handle to the new raster object. */ | |
| 1091 /* */ | |
| 1092 /* pool_base :: The address in memory of the render pool. */ | |
| 1093 /* */ | |
| 1094 /* pool_size :: The size in bytes of the render pool. */ | |
| 1095 /* */ | |
| 1096 /* <Note> */ | |
| 1097 /* Rasters can ignore the render pool and rely on dynamic memory */ | |
| 1098 /* allocation if they want to (a handle to the memory allocator is */ | |
| 1099 /* passed to the raster constructor). However, this is not */ | |
| 1100 /* recommended for efficiency purposes. */ | |
| 1101 /* */ | |
| 1102 typedef void | |
| 1103 (*FT_Raster_ResetFunc)( FT_Raster raster, | |
| 1104 unsigned char* pool_base, | |
| 1105 unsigned long pool_size ); | |
| 1106 | |
| 1107 #define FT_Raster_Reset_Func FT_Raster_ResetFunc | |
| 1108 | |
| 1109 | |
| 1110 /*************************************************************************/ | |
| 1111 /* */ | |
| 1112 /* <FuncType> */ | |
| 1113 /* FT_Raster_SetModeFunc */ | |
| 1114 /* */ | |
| 1115 /* <Description> */ | |
| 1116 /* This function is a generic facility to change modes or attributes */ | |
| 1117 /* in a given raster. This can be used for debugging purposes, or */ | |
| 1118 /* simply to allow implementation-specific `features' in a given */ | |
| 1119 /* raster module. */ | |
| 1120 /* */ | |
| 1121 /* <Input> */ | |
| 1122 /* raster :: A handle to the new raster object. */ | |
| 1123 /* */ | |
| 1124 /* mode :: A 4-byte tag used to name the mode or property. */ | |
| 1125 /* */ | |
| 1126 /* args :: A pointer to the new mode/property to use. */ | |
| 1127 /* */ | |
| 1128 typedef int | |
| 1129 (*FT_Raster_SetModeFunc)( FT_Raster raster, | |
| 1130 unsigned long mode, | |
| 1131 void* args ); | |
| 1132 | |
| 1133 #define FT_Raster_Set_Mode_Func FT_Raster_SetModeFunc | |
| 1134 | |
| 1135 | |
| 1136 /*************************************************************************/ | |
| 1137 /* */ | |
| 1138 /* <FuncType> */ | |
| 1139 /* FT_Raster_RenderFunc */ | |
| 1140 /* */ | |
| 1141 /* <Description> */ | |
| 1142 /* Invoke a given raster to scan-convert a given glyph image into a */ | |
| 1143 /* target bitmap. */ | |
| 1144 /* */ | |
| 1145 /* <Input> */ | |
| 1146 /* raster :: A handle to the raster object. */ | |
| 1147 /* */ | |
| 1148 /* params :: A pointer to an @FT_Raster_Params structure used to */ | |
| 1149 /* store the rendering parameters. */ | |
| 1150 /* */ | |
| 1151 /* <Return> */ | |
| 1152 /* Error code. 0~means success. */ | |
| 1153 /* */ | |
| 1154 /* <Note> */ | |
| 1155 /* The exact format of the source image depends on the raster's glyph */ | |
| 1156 /* format defined in its @FT_Raster_Funcs structure. It can be an */ | |
| 1157 /* @FT_Outline or anything else in order to support a large array of */ | |
| 1158 /* glyph formats. */ | |
| 1159 /* */ | |
| 1160 /* Note also that the render function can fail and return a */ | |
| 1161 /* `FT_Err_Unimplemented_Feature' error code if the raster used does */ | |
| 1162 /* not support direct composition. */ | |
| 1163 /* */ | |
| 1164 /* XXX: For now, the standard raster doesn't support direct */ | |
| 1165 /* composition but this should change for the final release (see */ | |
| 1166 /* the files `demos/src/ftgrays.c' and `demos/src/ftgrays2.c' */ | |
| 1167 /* for examples of distinct implementations that support direct */ | |
| 1168 /* composition). */ | |
| 1169 /* */ | |
| 1170 typedef int | |
| 1171 (*FT_Raster_RenderFunc)( FT_Raster raster, | |
| 1172 const FT_Raster_Params* params ); | |
| 1173 | |
| 1174 #define FT_Raster_Render_Func FT_Raster_RenderFunc | |
| 1175 | |
| 1176 | |
| 1177 /*************************************************************************/ | |
| 1178 /* */ | |
| 1179 /* <Struct> */ | |
| 1180 /* FT_Raster_Funcs */ | |
| 1181 /* */ | |
| 1182 /* <Description> */ | |
| 1183 /* A structure used to describe a given raster class to the library. */ | |
| 1184 /* */ | |
| 1185 /* <Fields> */ | |
| 1186 /* glyph_format :: The supported glyph format for this raster. */ | |
| 1187 /* */ | |
| 1188 /* raster_new :: The raster constructor. */ | |
| 1189 /* */ | |
| 1190 /* raster_reset :: Used to reset the render pool within the raster. */ | |
| 1191 /* */ | |
| 1192 /* raster_render :: A function to render a glyph into a given bitmap. */ | |
| 1193 /* */ | |
| 1194 /* raster_done :: The raster destructor. */ | |
| 1195 /* */ | |
| 1196 typedef struct FT_Raster_Funcs_ | |
| 1197 { | |
| 1198 FT_Glyph_Format glyph_format; | |
| 1199 FT_Raster_NewFunc raster_new; | |
| 1200 FT_Raster_ResetFunc raster_reset; | |
| 1201 FT_Raster_SetModeFunc raster_set_mode; | |
| 1202 FT_Raster_RenderFunc raster_render; | |
| 1203 FT_Raster_DoneFunc raster_done; | |
| 1204 | |
| 1205 } FT_Raster_Funcs; | |
| 1206 | |
| 1207 /* */ | |
| 1208 | |
| 1209 | |
| 1210 FT_END_HEADER | |
| 1211 | |
| 1212 #endif /* __FTIMAGE_H__ */ | |
| 1213 | |
| 1214 | |
| 1215 /* END */ | |
| 1216 | |
| 1217 | |
| 1218 /* Local Variables: */ | |
| 1219 /* coding: utf-8 */ | |
| 1220 /* End: */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1413673003:
Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master