David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* ftgrays.c */ |
| 4 | /* */ |
| 5 | /* A new `perfect' anti-aliasing renderer (body). */ |
| 6 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 7 | /* Copyright 2000 by */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
| 9 | /* */ |
| 10 | /* This file is part of the FreeType project, and may only be used, */ |
| 11 | /* modified, and distributed under the terms of the FreeType project */ |
| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
| 13 | /* this file you indicate that you have read the license and */ |
| 14 | /* understand and accept it fully. */ |
| 15 | /* */ |
| 16 | /***************************************************************************/ |
| 17 | |
| 18 | /*************************************************************************/ |
| 19 | /* */ |
| 20 | /* This file can be compiled without the rest of the FreeType engine, */ |
| 21 | /* by defining the _STANDALONE_ macro when compiling it. You also need */ |
| 22 | /* to put the files `ftgrays.h' and `ftimage.h' into the current */ |
| 23 | /* compilation directory. Typically, you could do something like */ |
| 24 | /* */ |
| 25 | /* - copy `src/base/ftgrays.c' to your current directory */ |
| 26 | /* */ |
| 27 | /* - copy `include/freetype/ftimage.h' and */ |
| 28 | /* `include/freetype/ftgrays.h' to the same directory */ |
| 29 | /* */ |
| 30 | /* - compile `ftgrays' with the _STANDALONE_ macro defined, as in */ |
| 31 | /* */ |
| 32 | /* cc -c -D_STANDALONE_ ftgrays.c */ |
| 33 | /* */ |
| 34 | /* The renderer can be initialized with a call to */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 35 | /* `ft_gray_raster.gray_raster_new'; an anti-aliased bitmap can be */ |
| 36 | /* generated with a call to `ft_gray_raster.gray_raster_render'. */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 37 | /* */ |
| 38 | /* See the comments and documentation in the file `ftimage.h' for */ |
| 39 | /* more details on how the raster works. */ |
| 40 | /* */ |
| 41 | /*************************************************************************/ |
| 42 | |
| 43 | /*************************************************************************/ |
| 44 | /* */ |
| 45 | /* This is a new anti-aliasing scan-converter for FreeType 2. The */ |
| 46 | /* algorithm used here is _very_ different from the one in the standard */ |
| 47 | /* `ftraster' module. Actually, `ftgrays' computes the _exact_ */ |
| 48 | /* coverage of the outline on each pixel cell. */ |
| 49 | /* */ |
| 50 | /* It is based on ideas that I initially found in Raph Levien's */ |
| 51 | /* excellent LibArt graphics library (see http://www.levien.com/libart */ |
| 52 | /* for more information, though the web pages do not tell anything */ |
| 53 | /* about the renderer; you'll have to dive into the source code to */ |
| 54 | /* understand how it works). */ |
| 55 | /* */ |
| 56 | /* Note, however, that this is a _very_ different implementation */ |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 57 | /* compared to Raph's. Coverage information is stored in a very */ |
| 58 | /* different way, and I don't use sorted vector paths. Also, it */ |
| 59 | /* doesn't use floating point values. */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 60 | /* */ |
| 61 | /* This renderer has the following advantages: */ |
| 62 | /* */ |
| 63 | /* - It doesn't need an intermediate bitmap. Instead, one can supply */ |
| 64 | /* a callback function that will be called by the renderer to draw */ |
| 65 | /* gray spans on any target surface. You can thus do direct */ |
| 66 | /* composition on any kind of bitmap, provided that you give the */ |
| 67 | /* renderer the right callback. */ |
| 68 | /* */ |
| 69 | /* - A perfect anti-aliaser, i.e., it computes the _exact_ coverage on */ |
| 70 | /* each pixel cell */ |
| 71 | /* */ |
| 72 | /* - It performs a single pass on the outline (the `standard' FT2 */ |
| 73 | /* renderer makes two passes). */ |
| 74 | /* */ |
| 75 | /* - It can easily be modified to render to _any_ number of gray levels */ |
| 76 | /* cheaply. */ |
| 77 | /* */ |
| 78 | /* - For small (< 20) pixel sizes, it is faster than the standard */ |
| 79 | /* renderer. */ |
| 80 | /* */ |
| 81 | /*************************************************************************/ |
| 82 | |
| 83 | |
| 84 | #include <string.h> /* for memcpy() */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 85 | #include <setjmp.h> |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 86 | |
| 87 | /*************************************************************************/ |
| 88 | /* */ |
| 89 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| 90 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| 91 | /* messages during execution. */ |
| 92 | /* */ |
| 93 | #undef FT_COMPONENT |
| 94 | #define FT_COMPONENT trace_aaraster |
| 95 | |
| 96 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 97 | #define ErrRaster_MemoryOverflow -4 |
| 98 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 99 | #ifdef _STANDALONE_ |
| 100 | |
Werner Lemberg | b48a609 | 2000-07-09 19:15:30 +0000 | [diff] [blame] | 101 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 102 | #define ErrRaster_Invalid_Mode -2 |
Werner Lemberg | b48a609 | 2000-07-09 19:15:30 +0000 | [diff] [blame] | 103 | #define ErrRaster_Invalid_Outline -1 |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 104 | |
| 105 | #include "ftimage.h" |
| 106 | #include "ftgrays.h" |
| 107 | |
| 108 | /* This macro is used to indicate that a function parameter is unused. */ |
| 109 | /* Its purpose is simply to reduce compiler warnings. Note also that */ |
| 110 | /* simply defining it as `(void)x' doesn't avoid warnings with certain */ |
| 111 | /* ANSI compilers (e.g. LCC). */ |
David Turner | c6a9220 | 2000-07-04 18:12:13 +0000 | [diff] [blame] | 112 | #define FT_UNUSED( x ) (x) = (x) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 113 | |
| 114 | /* Disable the tracing mechanism for simplicity -- developers can */ |
| 115 | /* activate it easily by redefining these two macros. */ |
| 116 | #ifndef FT_ERROR |
| 117 | #define FT_ERROR( x ) do ; while ( 0 ) /* nothing */ |
| 118 | #endif |
| 119 | |
| 120 | #ifndef FT_TRACE |
| 121 | #define FT_TRACE( x ) do ; while ( 0 ) /* nothing */ |
| 122 | #endif |
| 123 | |
| 124 | |
| 125 | #else /* _STANDALONE_ */ |
| 126 | |
Werner Lemberg | 1f7f0e8 | 2001-06-06 17:30:41 +0000 | [diff] [blame] | 127 | |
Werner Lemberg | 63408a1 | 2000-12-13 23:44:37 +0000 | [diff] [blame] | 128 | #include <ft2build.h> |
David Turner | 8d3a401 | 2001-03-20 11:14:24 +0000 | [diff] [blame] | 129 | #include "ftgrays.h" |
Werner Lemberg | 63408a1 | 2000-12-13 23:44:37 +0000 | [diff] [blame] | 130 | #include FT_INTERNAL_OBJECTS_H |
| 131 | #include FT_INTERNAL_DEBUG_H |
| 132 | #include FT_OUTLINE_H |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 133 | |
Werner Lemberg | 1f7f0e8 | 2001-06-06 17:30:41 +0000 | [diff] [blame] | 134 | #include "ftsmerrs.h" |
| 135 | |
| 136 | #define ErrRaster_Invalid_Mode Smooth_Err_Cannot_Render_Glyph |
| 137 | #define ErrRaster_Invalid_Outline Smooth_Err_Invalid_Outline |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 138 | |
| 139 | |
| 140 | #endif /* _STANDALONE_ */ |
| 141 | |
| 142 | |
| 143 | /* define this to dump debugging information */ |
| 144 | #define xxxDEBUG_GRAYS |
| 145 | |
| 146 | /* as usual, for the speed hungry :-) */ |
| 147 | |
| 148 | #ifndef FT_STATIC_RASTER |
| 149 | |
| 150 | |
| 151 | #define RAS_ARG PRaster raster |
| 152 | #define RAS_ARG_ PRaster raster, |
| 153 | |
| 154 | #define RAS_VAR raster |
| 155 | #define RAS_VAR_ raster, |
| 156 | |
| 157 | #define ras (*raster) |
| 158 | |
| 159 | |
| 160 | #else /* FT_STATIC_RASTER */ |
| 161 | |
| 162 | |
| 163 | #define RAS_ARG /* empty */ |
| 164 | #define RAS_ARG_ /* empty */ |
| 165 | #define RAS_VAR /* empty */ |
| 166 | #define RAS_VAR_ /* empty */ |
| 167 | |
| 168 | static TRaster ras; |
| 169 | |
| 170 | |
| 171 | #endif /* FT_STATIC_RASTER */ |
| 172 | |
| 173 | |
| 174 | /* must be at least 6 bits! */ |
| 175 | #define PIXEL_BITS 8 |
| 176 | |
| 177 | #define ONE_PIXEL ( 1L << PIXEL_BITS ) |
| 178 | #define PIXEL_MASK ( -1L << PIXEL_BITS ) |
| 179 | #define TRUNC( x ) ( (x) >> PIXEL_BITS ) |
| 180 | #define SUBPIXELS( x ) ( (x) << PIXEL_BITS ) |
| 181 | #define FLOOR( x ) ( (x) & -ONE_PIXEL ) |
| 182 | #define CEILING( x ) ( ( (x) + ONE_PIXEL - 1 ) & -ONE_PIXEL ) |
| 183 | #define ROUND( x ) ( ( (x) + ONE_PIXEL / 2 ) & -ONE_PIXEL ) |
| 184 | |
| 185 | #if PIXEL_BITS >= 6 |
| 186 | #define UPSCALE( x ) ( (x) << ( PIXEL_BITS - 6 ) ) |
| 187 | #define DOWNSCALE( x ) ( (x) >> ( PIXEL_BITS - 6 ) ) |
| 188 | #else |
| 189 | #define UPSCALE( x ) ( (x) >> ( 6 - PIXEL_BITS ) ) |
| 190 | #define DOWNSCALE( x ) ( (x) << ( 6 - PIXEL_BITS ) ) |
| 191 | #endif |
| 192 | |
| 193 | /* Define this if you want to use a more compact storage scheme. This */ |
| 194 | /* increases the number of cells available in the render pool but slows */ |
| 195 | /* down the rendering a bit. It is useful if you have a really tiny */ |
| 196 | /* render pool. */ |
| 197 | #define xxxGRAYS_COMPACT |
| 198 | |
| 199 | |
| 200 | /*************************************************************************/ |
| 201 | /* */ |
| 202 | /* TYPE DEFINITIONS */ |
| 203 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 204 | |
| 205 | /* don't change the following types to FT_Int or FT_Pos, since we might */ |
| 206 | /* need to define them to "float" or "double" when experimenting with */ |
| 207 | /* new algorithms.. */ |
| 208 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 209 | typedef int TScan; /* integer scanline/pixel coordinate */ |
| 210 | typedef long TPos; /* sub-pixel coordinate */ |
| 211 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 212 | /* determine the type used to store cell areas. This normally takes at */ |
| 213 | /* least PIXEL_BYTES*2 + 1, on 16-bit systems, we need to use 'longs' */ |
| 214 | /* instead of 'ints'.. otherwise bad things happen.. */ |
| 215 | |
| 216 | #if PIXEL_BITS <= 7 |
| 217 | |
| 218 | typedef int TArea; |
| 219 | |
| 220 | #else /* PIXEL_BITS >= 8 */ |
| 221 | |
| 222 | /* approximately determine the size of integers using an ANSI-C header */ |
| 223 | # include <limits.h> |
| 224 | # if UINT_MAX == 0xFFFFU |
| 225 | typedef long TArea; |
| 226 | # else |
| 227 | typedef int TArea; |
| 228 | # endif |
| 229 | |
| 230 | #endif /* PIXEL_BITS >= 8 */ |
| 231 | |
| 232 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 233 | /* maximal number of gray spans in a call to the span callback */ |
| 234 | #define FT_MAX_GRAY_SPANS 32 |
| 235 | |
| 236 | |
| 237 | #ifdef GRAYS_COMPACT |
| 238 | |
| 239 | typedef struct TCell_ |
| 240 | { |
| 241 | short x : 14; |
| 242 | short y : 14; |
| 243 | int cover : PIXEL_BITS + 2; |
| 244 | int area : PIXEL_BITS * 2 + 2; |
| 245 | |
| 246 | } TCell, *PCell; |
| 247 | |
| 248 | #else /* GRAYS_COMPACT */ |
| 249 | |
| 250 | typedef struct TCell_ |
| 251 | { |
| 252 | TScan x; |
| 253 | TScan y; |
| 254 | int cover; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 255 | TArea area; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 256 | |
| 257 | } TCell, *PCell; |
| 258 | |
| 259 | #endif /* GRAYS_COMPACT */ |
| 260 | |
| 261 | |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 262 | typedef struct TRaster_ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 263 | { |
| 264 | PCell cells; |
| 265 | int max_cells; |
| 266 | int num_cells; |
| 267 | |
| 268 | TScan min_ex, max_ex; |
| 269 | TScan min_ey, max_ey; |
| 270 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 271 | TArea area; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 272 | int cover; |
| 273 | int invalid; |
| 274 | |
| 275 | TScan ex, ey; |
| 276 | TScan cx, cy; |
| 277 | TPos x, y; |
| 278 | |
| 279 | TScan last_ey; |
| 280 | |
Werner Lemberg | 3780273 | 2001-04-26 13:34:36 +0000 | [diff] [blame] | 281 | FT_Vector bez_stack[32 * 3 + 1]; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 282 | int lev_stack[32]; |
| 283 | |
| 284 | FT_Outline outline; |
| 285 | FT_Bitmap target; |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 286 | FT_BBox clip_box; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 287 | |
| 288 | FT_Span gray_spans[FT_MAX_GRAY_SPANS]; |
| 289 | int num_gray_spans; |
| 290 | |
| 291 | FT_Raster_Span_Func render_span; |
| 292 | void* render_span_data; |
| 293 | int span_y; |
| 294 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 295 | int band_size; |
| 296 | int band_shoot; |
| 297 | int conic_level; |
| 298 | int cubic_level; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 299 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 300 | void* memory; |
| 301 | jmp_buf jump_buffer; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 302 | |
| 303 | } TRaster, *PRaster; |
| 304 | |
| 305 | |
| 306 | /*************************************************************************/ |
| 307 | /* */ |
| 308 | /* Initialize the cells table. */ |
| 309 | /* */ |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 310 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 311 | gray_init_cells( RAS_ARG_ void* buffer, |
| 312 | long byte_size ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 313 | { |
| 314 | ras.cells = (PCell)buffer; |
| 315 | ras.max_cells = byte_size / sizeof ( TCell ); |
| 316 | ras.num_cells = 0; |
| 317 | ras.area = 0; |
| 318 | ras.cover = 0; |
| 319 | ras.invalid = 1; |
| 320 | } |
| 321 | |
| 322 | |
| 323 | /*************************************************************************/ |
| 324 | /* */ |
| 325 | /* Compute the outline bounding box. */ |
| 326 | /* */ |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 327 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 328 | gray_compute_cbox( RAS_ARG ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 329 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 330 | FT_Outline* outline = &ras.outline; |
| 331 | FT_Vector* vec = outline->points; |
| 332 | FT_Vector* limit = vec + outline->n_points; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 333 | |
| 334 | |
| 335 | if ( outline->n_points <= 0 ) |
| 336 | { |
| 337 | ras.min_ex = ras.max_ex = 0; |
| 338 | ras.min_ey = ras.max_ey = 0; |
| 339 | return; |
| 340 | } |
| 341 | |
| 342 | ras.min_ex = ras.max_ex = vec->x; |
| 343 | ras.min_ey = ras.max_ey = vec->y; |
| 344 | |
| 345 | vec++; |
| 346 | |
| 347 | for ( ; vec < limit; vec++ ) |
| 348 | { |
| 349 | TPos x = vec->x; |
| 350 | TPos y = vec->y; |
| 351 | |
| 352 | |
| 353 | if ( x < ras.min_ex ) ras.min_ex = x; |
| 354 | if ( x > ras.max_ex ) ras.max_ex = x; |
| 355 | if ( y < ras.min_ey ) ras.min_ey = y; |
| 356 | if ( y > ras.max_ey ) ras.max_ey = y; |
| 357 | } |
| 358 | |
| 359 | /* truncate the bounding box to integer pixels */ |
| 360 | ras.min_ex = ras.min_ex >> 6; |
| 361 | ras.min_ey = ras.min_ey >> 6; |
| 362 | ras.max_ex = ( ras.max_ex + 63 ) >> 6; |
| 363 | ras.max_ey = ( ras.max_ey + 63 ) >> 6; |
| 364 | } |
| 365 | |
| 366 | |
| 367 | /*************************************************************************/ |
| 368 | /* */ |
| 369 | /* Record the current cell in the table. */ |
| 370 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 371 | static void |
| 372 | gray_record_cell( RAS_ARG ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 373 | { |
| 374 | PCell cell; |
| 375 | |
| 376 | |
| 377 | if ( !ras.invalid && ( ras.area | ras.cover ) ) |
| 378 | { |
| 379 | if ( ras.num_cells >= ras.max_cells ) |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 380 | longjmp( ras.jump_buffer, 1 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 381 | |
| 382 | cell = ras.cells + ras.num_cells++; |
| 383 | cell->x = ras.ex - ras.min_ex; |
| 384 | cell->y = ras.ey - ras.min_ey; |
| 385 | cell->area = ras.area; |
| 386 | cell->cover = ras.cover; |
| 387 | } |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | |
| 391 | /*************************************************************************/ |
| 392 | /* */ |
| 393 | /* Set the current cell to a new position. */ |
| 394 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 395 | static void |
| 396 | gray_set_cell( RAS_ARG_ TScan ex, |
| 397 | TScan ey ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 398 | { |
| 399 | int invalid, record, clean; |
| 400 | |
| 401 | |
| 402 | /* Move the cell pointer to a new position. We set the `invalid' */ |
| 403 | /* flag to indicate that the cell isn't part of those we're interested */ |
| 404 | /* in during the render phase. This means that: */ |
| 405 | /* */ |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 406 | /* . the new vertical position must be within min_ey..max_ey-1. */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 407 | /* . the new horizontal position must be strictly less than max_ex */ |
| 408 | /* */ |
| 409 | /* Note that if a cell is to the left of the clipping region, it is */ |
| 410 | /* actually set to the (min_ex-1) horizontal position. */ |
| 411 | |
| 412 | record = 0; |
| 413 | clean = 1; |
| 414 | |
| 415 | invalid = ( ey < ras.min_ey || ey >= ras.max_ey || ex >= ras.max_ex ); |
| 416 | if ( !invalid ) |
| 417 | { |
| 418 | /* All cells that are on the left of the clipping region go to the */ |
| 419 | /* min_ex - 1 horizontal position. */ |
| 420 | if ( ex < ras.min_ex ) |
| 421 | ex = ras.min_ex - 1; |
| 422 | |
| 423 | /* if our position is new, then record the previous cell */ |
| 424 | if ( ex != ras.ex || ey != ras.ey ) |
| 425 | record = 1; |
| 426 | else |
| 427 | clean = ras.invalid; /* do not clean if we didn't move from */ |
| 428 | /* a valid cell */ |
| 429 | } |
| 430 | |
| 431 | /* record the previous cell if needed (i.e., if we changed the cell */ |
| 432 | /* position, of changed the `invalid' flag) */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 433 | if ( ras.invalid != invalid || record ) |
| 434 | gray_record_cell( RAS_VAR ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 435 | |
| 436 | if ( clean ) |
| 437 | { |
| 438 | ras.area = 0; |
| 439 | ras.cover = 0; |
| 440 | } |
| 441 | |
| 442 | ras.invalid = invalid; |
| 443 | ras.ex = ex; |
| 444 | ras.ey = ey; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | |
| 448 | /*************************************************************************/ |
| 449 | /* */ |
| 450 | /* Start a new contour at a given cell. */ |
| 451 | /* */ |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 452 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 453 | gray_start_cell( RAS_ARG_ TScan ex, |
| 454 | TScan ey ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 455 | { |
| 456 | if ( ex < ras.min_ex ) |
| 457 | ex = ras.min_ex - 1; |
| 458 | |
| 459 | ras.area = 0; |
| 460 | ras.cover = 0; |
| 461 | ras.ex = ex; |
| 462 | ras.ey = ey; |
| 463 | ras.last_ey = SUBPIXELS( ey ); |
| 464 | ras.invalid = 0; |
| 465 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 466 | gray_set_cell( RAS_VAR_ ex, ey ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | |
| 470 | /*************************************************************************/ |
| 471 | /* */ |
| 472 | /* Render a scanline as one or more cells. */ |
| 473 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 474 | static void |
| 475 | gray_render_scanline( RAS_ARG_ TScan ey, |
| 476 | TPos x1, |
| 477 | TScan y1, |
| 478 | TPos x2, |
| 479 | TScan y2 ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 480 | { |
| 481 | TScan ex1, ex2, fx1, fx2, delta; |
| 482 | long p, first, dx; |
| 483 | int incr, lift, mod, rem; |
| 484 | |
| 485 | |
| 486 | dx = x2 - x1; |
| 487 | |
| 488 | ex1 = TRUNC( x1 ); /* if (ex1 >= ras.max_ex) ex1 = ras.max_ex-1; */ |
| 489 | ex2 = TRUNC( x2 ); /* if (ex2 >= ras.max_ex) ex2 = ras.max_ex-1; */ |
| 490 | fx1 = x1 - SUBPIXELS( ex1 ); |
| 491 | fx2 = x2 - SUBPIXELS( ex2 ); |
| 492 | |
| 493 | /* trivial case. Happens often */ |
| 494 | if ( y1 == y2 ) |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 495 | { |
| 496 | gray_set_cell( RAS_VAR_ ex2, ey ); |
| 497 | return; |
| 498 | } |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 499 | |
| 500 | /* everything is located in a single cell. That is easy! */ |
| 501 | /* */ |
| 502 | if ( ex1 == ex2 ) |
| 503 | { |
| 504 | delta = y2 - y1; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 505 | ras.area += (TArea)( fx1 + fx2 ) * delta; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 506 | ras.cover += delta; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 507 | return; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | /* ok, we'll have to render a run of adjacent cells on the same */ |
| 511 | /* scanline... */ |
| 512 | /* */ |
| 513 | p = ( ONE_PIXEL - fx1 ) * ( y2 - y1 ); |
| 514 | first = ONE_PIXEL; |
| 515 | incr = 1; |
| 516 | |
| 517 | if ( dx < 0 ) |
| 518 | { |
| 519 | p = fx1 * ( y2 - y1 ); |
| 520 | first = 0; |
| 521 | incr = -1; |
| 522 | dx = -dx; |
| 523 | } |
| 524 | |
| 525 | delta = p / dx; |
| 526 | mod = p % dx; |
| 527 | if ( mod < 0 ) |
| 528 | { |
| 529 | delta--; |
| 530 | mod += dx; |
| 531 | } |
| 532 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 533 | ras.area += (TArea)( fx1 + first ) * delta; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 534 | ras.cover += delta; |
| 535 | |
| 536 | ex1 += incr; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 537 | gray_set_cell( RAS_VAR_ ex1, ey ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 538 | y1 += delta; |
| 539 | |
| 540 | if ( ex1 != ex2 ) |
| 541 | { |
| 542 | p = ONE_PIXEL * ( y2 - y1 ); |
| 543 | lift = p / dx; |
| 544 | rem = p % dx; |
| 545 | if ( rem < 0 ) |
| 546 | { |
| 547 | lift--; |
| 548 | rem += dx; |
| 549 | } |
| 550 | |
| 551 | mod -= dx; |
| 552 | |
| 553 | while ( ex1 != ex2 ) |
| 554 | { |
| 555 | delta = lift; |
| 556 | mod += rem; |
| 557 | if ( mod >= 0 ) |
| 558 | { |
| 559 | mod -= dx; |
| 560 | delta++; |
| 561 | } |
| 562 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 563 | ras.area += (TArea)ONE_PIXEL * delta; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 564 | ras.cover += delta; |
| 565 | y1 += delta; |
| 566 | ex1 += incr; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 567 | gray_set_cell( RAS_VAR_ ex1, ey ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 568 | } |
| 569 | } |
| 570 | |
| 571 | delta = y2 - y1; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 572 | ras.area += (TArea)( fx2 + ONE_PIXEL - first ) * delta; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 573 | ras.cover += delta; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | |
| 577 | /*************************************************************************/ |
| 578 | /* */ |
| 579 | /* Render a given line as a series of scanlines. */ |
| 580 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 581 | static void |
| 582 | gray_render_line( RAS_ARG_ TPos to_x, |
| 583 | TPos to_y ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 584 | { |
| 585 | TScan ey1, ey2, fy1, fy2; |
| 586 | TPos dx, dy, x, x2; |
| 587 | int p, rem, mod, lift, delta, first, incr; |
| 588 | |
| 589 | |
| 590 | ey1 = TRUNC( ras.last_ey ); |
| 591 | ey2 = TRUNC( to_y ); /* if (ey2 >= ras.max_ey) ey2 = ras.max_ey-1; */ |
| 592 | fy1 = ras.y - ras.last_ey; |
| 593 | fy2 = to_y - SUBPIXELS( ey2 ); |
| 594 | |
| 595 | dx = to_x - ras.x; |
| 596 | dy = to_y - ras.y; |
| 597 | |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 598 | /* XXX: we should do something about the trivial case where dx == 0, */ |
| 599 | /* as it happens very often! */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 600 | |
| 601 | /* perform vertical clipping */ |
| 602 | { |
| 603 | TScan min, max; |
| 604 | |
| 605 | |
| 606 | min = ey1; |
| 607 | max = ey2; |
| 608 | if ( ey1 > ey2 ) |
| 609 | { |
| 610 | min = ey2; |
| 611 | max = ey1; |
| 612 | } |
| 613 | if ( min >= ras.max_ey || max < ras.min_ey ) |
| 614 | goto End; |
| 615 | } |
| 616 | |
| 617 | /* everything is on a single scanline */ |
| 618 | if ( ey1 == ey2 ) |
| 619 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 620 | gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, to_x, fy2 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 621 | goto End; |
| 622 | } |
| 623 | |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 624 | /* ok, we have to render several scanlines */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 625 | p = ( ONE_PIXEL - fy1 ) * dx; |
| 626 | first = ONE_PIXEL; |
| 627 | incr = 1; |
| 628 | |
| 629 | if ( dy < 0 ) |
| 630 | { |
| 631 | p = fy1 * dx; |
| 632 | first = 0; |
| 633 | incr = -1; |
| 634 | dy = -dy; |
| 635 | } |
| 636 | |
| 637 | delta = p / dy; |
| 638 | mod = p % dy; |
| 639 | if ( mod < 0 ) |
| 640 | { |
| 641 | delta--; |
| 642 | mod += dy; |
| 643 | } |
| 644 | |
| 645 | x = ras.x + delta; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 646 | gray_render_scanline( RAS_VAR_ ey1, ras.x, fy1, x, first ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 647 | |
| 648 | ey1 += incr; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 649 | gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 650 | |
| 651 | if ( ey1 != ey2 ) |
| 652 | { |
| 653 | p = ONE_PIXEL * dx; |
| 654 | lift = p / dy; |
| 655 | rem = p % dy; |
| 656 | if ( rem < 0 ) |
| 657 | { |
| 658 | lift--; |
| 659 | rem += dy; |
| 660 | } |
| 661 | mod -= dy; |
| 662 | |
| 663 | while ( ey1 != ey2 ) |
| 664 | { |
| 665 | delta = lift; |
| 666 | mod += rem; |
| 667 | if ( mod >= 0 ) |
| 668 | { |
| 669 | mod -= dy; |
| 670 | delta++; |
| 671 | } |
| 672 | |
| 673 | x2 = x + delta; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 674 | gray_render_scanline( RAS_VAR_ ey1, x, ONE_PIXEL - first, x2, first ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 675 | x = x2; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 676 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 677 | ey1 += incr; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 678 | gray_set_cell( RAS_VAR_ TRUNC( x ), ey1 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 679 | } |
| 680 | } |
| 681 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 682 | gray_render_scanline( RAS_VAR_ ey1, x, ONE_PIXEL - first, to_x, fy2 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 683 | |
| 684 | End: |
| 685 | ras.x = to_x; |
| 686 | ras.y = to_y; |
| 687 | ras.last_ey = SUBPIXELS( ey2 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 691 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 692 | gray_split_conic( FT_Vector* base ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 693 | { |
| 694 | TPos a, b; |
| 695 | |
| 696 | |
| 697 | base[4].x = base[2].x; |
| 698 | b = base[1].x; |
| 699 | a = base[3].x = ( base[2].x + b ) / 2; |
| 700 | b = base[1].x = ( base[0].x + b ) / 2; |
| 701 | base[2].x = ( a + b ) / 2; |
| 702 | |
| 703 | base[4].y = base[2].y; |
| 704 | b = base[1].y; |
| 705 | a = base[3].y = ( base[2].y + b ) / 2; |
| 706 | b = base[1].y = ( base[0].y + b ) / 2; |
| 707 | base[2].y = ( a + b ) / 2; |
| 708 | } |
| 709 | |
| 710 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 711 | static void |
| 712 | gray_render_conic( RAS_ARG_ FT_Vector* control, |
| 713 | FT_Vector* to ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 714 | { |
| 715 | TPos dx, dy; |
| 716 | int top, level; |
| 717 | int* levels; |
| 718 | FT_Vector* arc; |
| 719 | |
| 720 | |
| 721 | dx = DOWNSCALE( ras.x ) + to->x - ( control->x << 1 ); |
| 722 | if ( dx < 0 ) |
| 723 | dx = -dx; |
| 724 | dy = DOWNSCALE( ras.y ) + to->y - ( control->y << 1 ); |
| 725 | if ( dy < 0 ) |
| 726 | dy = -dy; |
| 727 | if ( dx < dy ) |
| 728 | dx = dy; |
| 729 | |
| 730 | level = 1; |
| 731 | dx = dx / ras.conic_level; |
| 732 | while ( dx > 0 ) |
| 733 | { |
David Turner | a8194a9 | 2000-09-02 00:20:42 +0000 | [diff] [blame] | 734 | dx >>= 2; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 735 | level++; |
| 736 | } |
| 737 | |
| 738 | /* a shortcut to speed things up */ |
| 739 | if ( level <= 1 ) |
| 740 | { |
| 741 | /* we compute the mid-point directly in order to avoid */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 742 | /* calling gray_split_conic() */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 743 | TPos to_x, to_y, mid_x, mid_y; |
| 744 | |
| 745 | |
| 746 | to_x = UPSCALE( to->x ); |
| 747 | to_y = UPSCALE( to->y ); |
| 748 | mid_x = ( ras.x + to_x + 2 * UPSCALE( control->x ) ) / 4; |
| 749 | mid_y = ( ras.y + to_y + 2 * UPSCALE( control->y ) ) / 4; |
| 750 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 751 | gray_render_line( RAS_VAR_ mid_x, mid_y ); |
| 752 | gray_render_line( RAS_VAR_ to_x, to_y ); |
| 753 | return; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 754 | } |
| 755 | |
| 756 | arc = ras.bez_stack; |
| 757 | levels = ras.lev_stack; |
| 758 | top = 0; |
| 759 | levels[0] = level; |
| 760 | |
| 761 | arc[0].x = UPSCALE( to->x ); |
| 762 | arc[0].y = UPSCALE( to->y ); |
| 763 | arc[1].x = UPSCALE( control->x ); |
| 764 | arc[1].y = UPSCALE( control->y ); |
| 765 | arc[2].x = ras.x; |
| 766 | arc[2].y = ras.y; |
| 767 | |
| 768 | while ( top >= 0 ) |
| 769 | { |
| 770 | level = levels[top]; |
| 771 | if ( level > 1 ) |
| 772 | { |
| 773 | /* check that the arc crosses the current band */ |
| 774 | TPos min, max, y; |
| 775 | |
| 776 | |
| 777 | min = max = arc[0].y; |
| 778 | |
| 779 | y = arc[1].y; |
| 780 | if ( y < min ) min = y; |
| 781 | if ( y > max ) max = y; |
| 782 | |
| 783 | y = arc[2].y; |
| 784 | if ( y < min ) min = y; |
| 785 | if ( y > max ) max = y; |
| 786 | |
| 787 | if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < 0 ) |
| 788 | goto Draw; |
| 789 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 790 | gray_split_conic( arc ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 791 | arc += 2; |
| 792 | top++; |
| 793 | levels[top] = levels[top - 1] = level - 1; |
| 794 | continue; |
| 795 | } |
| 796 | |
| 797 | Draw: |
| 798 | { |
| 799 | TPos to_x, to_y, mid_x, mid_y; |
| 800 | |
| 801 | |
| 802 | to_x = arc[0].x; |
| 803 | to_y = arc[0].y; |
| 804 | mid_x = ( ras.x + to_x + 2 * arc[1].x ) / 4; |
| 805 | mid_y = ( ras.y + to_y + 2 * arc[1].y ) / 4; |
| 806 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 807 | gray_render_line( RAS_VAR_ mid_x, mid_y ); |
| 808 | gray_render_line( RAS_VAR_ to_x, to_y ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 809 | |
| 810 | top--; |
| 811 | arc -= 2; |
| 812 | } |
| 813 | } |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 814 | return; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 815 | } |
| 816 | |
| 817 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 818 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 819 | gray_split_cubic( FT_Vector* base ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 820 | { |
| 821 | TPos a, b, c, d; |
| 822 | |
| 823 | |
| 824 | base[6].x = base[3].x; |
| 825 | c = base[1].x; |
| 826 | d = base[2].x; |
| 827 | base[1].x = a = ( base[0].x + c ) / 2; |
| 828 | base[5].x = b = ( base[3].x + d ) / 2; |
| 829 | c = ( c + d ) / 2; |
| 830 | base[2].x = a = ( a + c ) / 2; |
| 831 | base[4].x = b = ( b + c ) / 2; |
| 832 | base[3].x = ( a + b ) / 2; |
| 833 | |
| 834 | base[6].y = base[3].y; |
| 835 | c = base[1].y; |
| 836 | d = base[2].y; |
| 837 | base[1].y = a = ( base[0].y + c ) / 2; |
| 838 | base[5].y = b = ( base[3].y + d ) / 2; |
| 839 | c = ( c + d ) / 2; |
| 840 | base[2].y = a = ( a + c ) / 2; |
| 841 | base[4].y = b = ( b + c ) / 2; |
| 842 | base[3].y = ( a + b ) / 2; |
| 843 | } |
| 844 | |
| 845 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 846 | static void |
| 847 | gray_render_cubic( RAS_ARG_ FT_Vector* control1, |
| 848 | FT_Vector* control2, |
| 849 | FT_Vector* to ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 850 | { |
| 851 | TPos dx, dy, da, db; |
| 852 | int top, level; |
| 853 | int* levels; |
| 854 | FT_Vector* arc; |
| 855 | |
| 856 | |
| 857 | dx = DOWNSCALE( ras.x ) + to->x - ( control1->x << 1 ); |
| 858 | if ( dx < 0 ) |
| 859 | dx = -dx; |
| 860 | dy = DOWNSCALE( ras.y ) + to->y - ( control1->y << 1 ); |
| 861 | if ( dy < 0 ) |
| 862 | dy = -dy; |
| 863 | if ( dx < dy ) |
| 864 | dx = dy; |
| 865 | da = dx; |
| 866 | |
| 867 | dx = DOWNSCALE( ras.x ) + to->x - 3 * ( control1->x + control2->x ); |
| 868 | if ( dx < 0 ) |
| 869 | dx = -dx; |
| 870 | dy = DOWNSCALE( ras.y ) + to->y - 3 * ( control1->x + control2->y ); |
| 871 | if ( dy < 0 ) |
| 872 | dy = -dy; |
| 873 | if ( dx < dy ) |
| 874 | dx = dy; |
| 875 | db = dx; |
| 876 | |
| 877 | level = 1; |
| 878 | da = da / ras.cubic_level; |
| 879 | db = db / ras.conic_level; |
| 880 | while ( da > 0 || db > 0 ) |
| 881 | { |
David Turner | a8194a9 | 2000-09-02 00:20:42 +0000 | [diff] [blame] | 882 | da >>= 2; |
| 883 | db >>= 3; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 884 | level++; |
| 885 | } |
| 886 | |
| 887 | if ( level <= 1 ) |
| 888 | { |
| 889 | TPos to_x, to_y, mid_x, mid_y; |
| 890 | |
| 891 | |
| 892 | to_x = UPSCALE( to->x ); |
| 893 | to_y = UPSCALE( to->y ); |
| 894 | mid_x = ( ras.x + to_x + |
| 895 | 3 * UPSCALE( control1->x + control2->x ) ) / 8; |
| 896 | mid_y = ( ras.y + to_y + |
| 897 | 3 * UPSCALE( control1->y + control2->y ) ) / 8; |
| 898 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 899 | gray_render_line( RAS_VAR_ mid_x, mid_y ); |
| 900 | gray_render_line( RAS_VAR_ to_x, to_y ); |
| 901 | return; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 902 | } |
| 903 | |
| 904 | arc = ras.bez_stack; |
| 905 | arc[0].x = UPSCALE( to->x ); |
| 906 | arc[0].y = UPSCALE( to->y ); |
| 907 | arc[1].x = UPSCALE( control2->x ); |
| 908 | arc[1].y = UPSCALE( control2->y ); |
| 909 | arc[2].x = UPSCALE( control1->x ); |
| 910 | arc[2].y = UPSCALE( control1->y ); |
| 911 | arc[3].x = ras.x; |
| 912 | arc[3].y = ras.y; |
| 913 | |
| 914 | levels = ras.lev_stack; |
| 915 | top = 0; |
| 916 | levels[0] = level; |
| 917 | |
| 918 | while ( top >= 0 ) |
| 919 | { |
| 920 | level = levels[top]; |
| 921 | if ( level > 1 ) |
| 922 | { |
| 923 | /* check that the arc crosses the current band */ |
| 924 | TPos min, max, y; |
| 925 | |
| 926 | |
| 927 | min = max = arc[0].y; |
| 928 | y = arc[1].y; |
| 929 | if ( y < min ) min = y; |
| 930 | if ( y > max ) max = y; |
| 931 | y = arc[2].y; |
| 932 | if ( y < min ) min = y; |
| 933 | if ( y > max ) max = y; |
| 934 | y = arc[3].y; |
| 935 | if ( y < min ) min = y; |
| 936 | if ( y > max ) max = y; |
| 937 | if ( TRUNC( min ) >= ras.max_ey || TRUNC( max ) < 0 ) |
| 938 | goto Draw; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 939 | gray_split_cubic( arc ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 940 | arc += 3; |
| 941 | top ++; |
| 942 | levels[top] = levels[top - 1] = level - 1; |
| 943 | continue; |
| 944 | } |
| 945 | |
| 946 | Draw: |
| 947 | { |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 948 | TPos to_x, to_y, mid_x, mid_y; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 949 | |
| 950 | |
| 951 | to_x = arc[0].x; |
| 952 | to_y = arc[0].y; |
| 953 | mid_x = ( ras.x + to_x + 3 * ( arc[1].x + arc[2].x ) ) / 8; |
| 954 | mid_y = ( ras.y + to_y + 3 * ( arc[1].y + arc[2].y ) ) / 8; |
| 955 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 956 | gray_render_line( RAS_VAR_ mid_x, mid_y ); |
| 957 | gray_render_line( RAS_VAR_ to_x, to_y ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 958 | top --; |
| 959 | arc -= 3; |
| 960 | } |
| 961 | } |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 962 | return; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 963 | } |
| 964 | |
| 965 | |
| 966 | /* a macro comparing two cell pointers. Returns true if a <= b. */ |
| 967 | #if 1 |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 968 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 969 | #define PACK( a ) ( ( (long)(a)->y << 16 ) + (a)->x ) |
| 970 | #define LESS_THAN( a, b ) ( PACK( a ) < PACK( b ) ) |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 971 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 972 | #else /* 1 */ |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 973 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 974 | #define LESS_THAN( a, b ) ( (a)->y < (b)->y || \ |
| 975 | ( (a)->y == (b)->y && (a)->x < (b)->x ) ) |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 976 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 977 | #endif /* 1 */ |
| 978 | |
| 979 | #define SWAP_CELLS( a, b, temp ) do \ |
| 980 | { \ |
| 981 | temp = *(a); \ |
| 982 | *(a) = *(b); \ |
| 983 | *(b) = temp; \ |
| 984 | } while ( 0 ) |
| 985 | #define DEBUG_SORT |
| 986 | #define QUICK_SORT |
| 987 | |
| 988 | #ifdef SHELL_SORT |
| 989 | |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 990 | /* a simple shell sort algorithm that works directly on our */ |
| 991 | /* cells table */ |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 992 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 993 | gray_shell_sort ( PCell cells, |
| 994 | int count ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 995 | { |
| 996 | PCell i, j, limit = cells + count; |
| 997 | TCell temp; |
| 998 | int gap; |
| 999 | |
| 1000 | |
| 1001 | /* compute initial gap */ |
| 1002 | for ( gap = 0; ++gap < count; gap *= 3 ) |
| 1003 | ; |
| 1004 | |
| 1005 | while ( gap /= 3 ) |
| 1006 | { |
| 1007 | for ( i = cells + gap; i < limit; i++ ) |
| 1008 | { |
| 1009 | for ( j = i - gap; ; j -= gap ) |
| 1010 | { |
| 1011 | PCell k = j + gap; |
| 1012 | |
| 1013 | |
| 1014 | if ( LESS_THAN( j, k ) ) |
| 1015 | break; |
| 1016 | |
| 1017 | SWAP_CELLS( j, k, temp ); |
| 1018 | |
| 1019 | if ( j < cells + gap ) |
| 1020 | break; |
| 1021 | } |
| 1022 | } |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | #endif /* SHELL_SORT */ |
| 1027 | |
| 1028 | |
| 1029 | #ifdef QUICK_SORT |
| 1030 | |
| 1031 | /* This is a non-recursive quicksort that directly process our cells */ |
| 1032 | /* array. It should be faster than calling the stdlib qsort(), and we */ |
| 1033 | /* can even tailor our insertion threshold... */ |
| 1034 | |
| 1035 | #define QSORT_THRESHOLD 9 /* below this size, a sub-array will be sorted */ |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 1036 | /* through a normal insertion sort */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1037 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1038 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1039 | gray_quick_sort( PCell cells, |
| 1040 | int count ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1041 | { |
| 1042 | PCell stack[40]; /* should be enough ;-) */ |
| 1043 | PCell* top; /* top of stack */ |
| 1044 | PCell base, limit; |
| 1045 | TCell temp; |
| 1046 | |
| 1047 | |
| 1048 | limit = cells + count; |
| 1049 | base = cells; |
| 1050 | top = stack; |
| 1051 | |
| 1052 | for (;;) |
| 1053 | { |
Werner Lemberg | 914b289 | 2001-03-10 17:07:42 +0000 | [diff] [blame] | 1054 | int len = (int)( limit - base ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1055 | PCell i, j, pivot; |
| 1056 | |
| 1057 | |
| 1058 | if ( len > QSORT_THRESHOLD ) |
| 1059 | { |
| 1060 | /* we use base + len/2 as the pivot */ |
| 1061 | pivot = base + len / 2; |
| 1062 | SWAP_CELLS( base, pivot, temp ); |
| 1063 | |
| 1064 | i = base + 1; |
| 1065 | j = limit - 1; |
| 1066 | |
| 1067 | /* now ensure that *i <= *base <= *j */ |
| 1068 | if ( LESS_THAN( j, i ) ) |
| 1069 | SWAP_CELLS( i, j, temp ); |
| 1070 | |
| 1071 | if ( LESS_THAN( base, i ) ) |
| 1072 | SWAP_CELLS( base, i, temp ); |
| 1073 | |
| 1074 | if ( LESS_THAN( j, base ) ) |
| 1075 | SWAP_CELLS( base, j, temp ); |
| 1076 | |
| 1077 | for (;;) |
| 1078 | { |
| 1079 | do i++; while ( LESS_THAN( i, base ) ); |
| 1080 | do j--; while ( LESS_THAN( base, j ) ); |
| 1081 | |
| 1082 | if ( i > j ) |
| 1083 | break; |
| 1084 | |
| 1085 | SWAP_CELLS( i, j, temp ); |
| 1086 | } |
| 1087 | |
| 1088 | SWAP_CELLS( base, j, temp ); |
| 1089 | |
| 1090 | /* now, push the largest sub-array */ |
| 1091 | if ( j - base > limit - i ) |
| 1092 | { |
| 1093 | top[0] = base; |
| 1094 | top[1] = j; |
| 1095 | base = i; |
| 1096 | } |
| 1097 | else |
| 1098 | { |
| 1099 | top[0] = i; |
| 1100 | top[1] = limit; |
| 1101 | limit = j; |
| 1102 | } |
| 1103 | top += 2; |
| 1104 | } |
| 1105 | else |
| 1106 | { |
| 1107 | /* the sub-array is small, perform insertion sort */ |
| 1108 | j = base; |
| 1109 | i = j + 1; |
| 1110 | |
| 1111 | for ( ; i < limit; j = i, i++ ) |
| 1112 | { |
| 1113 | for ( ; LESS_THAN( j + 1, j ); j-- ) |
| 1114 | { |
| 1115 | SWAP_CELLS( j + 1, j, temp ); |
| 1116 | if ( j == base ) |
| 1117 | break; |
| 1118 | } |
| 1119 | } |
| 1120 | if ( top > stack ) |
| 1121 | { |
| 1122 | top -= 2; |
| 1123 | base = top[0]; |
| 1124 | limit = top[1]; |
| 1125 | } |
| 1126 | else |
| 1127 | break; |
| 1128 | } |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | #endif /* QUICK_SORT */ |
| 1133 | |
| 1134 | |
| 1135 | #ifdef DEBUG_GRAYS |
| 1136 | #ifdef DEBUG_SORT |
| 1137 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1138 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1139 | gray_check_sort( PCell cells, |
| 1140 | int count ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1141 | { |
| 1142 | PCell p, q; |
| 1143 | |
| 1144 | |
| 1145 | for ( p = cells + count - 2; p >= cells; p-- ) |
| 1146 | { |
| 1147 | q = p + 1; |
| 1148 | if ( !LESS_THAN( p, q ) ) |
| 1149 | return 0; |
| 1150 | } |
| 1151 | return 1; |
| 1152 | } |
| 1153 | |
| 1154 | #endif /* DEBUG_SORT */ |
| 1155 | #endif /* DEBUG_GRAYS */ |
| 1156 | |
| 1157 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1158 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1159 | gray_move_to( FT_Vector* to, |
| 1160 | FT_Raster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1161 | { |
| 1162 | TPos x, y; |
| 1163 | |
| 1164 | |
| 1165 | /* record current cell, if any */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1166 | gray_record_cell( (PRaster)raster ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1167 | |
| 1168 | /* start to a new position */ |
| 1169 | x = UPSCALE( to->x ); |
| 1170 | y = UPSCALE( to->y ); |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1171 | |
| 1172 | gray_start_cell( (PRaster)raster, TRUNC( x ), TRUNC( y ) ); |
| 1173 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1174 | ((PRaster)raster)->x = x; |
| 1175 | ((PRaster)raster)->y = y; |
| 1176 | return 0; |
| 1177 | } |
| 1178 | |
| 1179 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1180 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1181 | gray_line_to( FT_Vector* to, |
| 1182 | FT_Raster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1183 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1184 | gray_render_line( (PRaster)raster, |
| 1185 | UPSCALE( to->x ), UPSCALE( to->y ) ); |
| 1186 | return 0; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1187 | } |
| 1188 | |
| 1189 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1190 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1191 | gray_conic_to( FT_Vector* control, |
| 1192 | FT_Vector* to, |
| 1193 | FT_Raster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1194 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1195 | gray_render_conic( (PRaster)raster, control, to ); |
| 1196 | return 0; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1200 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1201 | gray_cubic_to( FT_Vector* control1, |
| 1202 | FT_Vector* control2, |
| 1203 | FT_Vector* to, |
| 1204 | FT_Raster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1205 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1206 | gray_render_cubic( (PRaster)raster, control1, control2, to ); |
| 1207 | return 0; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1208 | } |
| 1209 | |
| 1210 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1211 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1212 | gray_render_span( int y, |
| 1213 | int count, |
| 1214 | FT_Span* spans, |
| 1215 | PRaster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1216 | { |
| 1217 | unsigned char* p; |
| 1218 | FT_Bitmap* map = &raster->target; |
| 1219 | |
| 1220 | |
| 1221 | /* first of all, compute the scanline offset */ |
| 1222 | p = (unsigned char*)map->buffer - y * map->pitch; |
| 1223 | if ( map->pitch >= 0 ) |
| 1224 | p += ( map->rows - 1 ) * map->pitch; |
| 1225 | |
| 1226 | for ( ; count > 0; count--, spans++ ) |
| 1227 | { |
| 1228 | if ( spans->coverage ) |
| 1229 | #if 1 |
| 1230 | memset( p + spans->x, (unsigned char)spans->coverage, spans->len ); |
| 1231 | #else /* 1 */ |
| 1232 | { |
| 1233 | q = p + spans->x; |
| 1234 | limit = q + spans->len; |
| 1235 | for ( ; q < limit; q++ ) |
| 1236 | q[0] = (unsigned char)spans->coverage; |
| 1237 | } |
| 1238 | #endif /* 1 */ |
| 1239 | } |
| 1240 | } |
| 1241 | |
| 1242 | |
| 1243 | #ifdef DEBUG_GRAYS |
| 1244 | |
| 1245 | #include <stdio.h> |
| 1246 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1247 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1248 | gray_dump_cells( RAS_ARG ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1249 | { |
| 1250 | PCell cell, limit; |
| 1251 | int y = -1; |
| 1252 | |
| 1253 | |
| 1254 | cell = ras.cells; |
| 1255 | limit = cell + ras.num_cells; |
| 1256 | |
| 1257 | for ( ; cell < limit; cell++ ) |
| 1258 | { |
| 1259 | if ( cell->y != y ) |
| 1260 | { |
| 1261 | fprintf( stderr, "\n%2d: ", cell->y ); |
| 1262 | y = cell->y; |
| 1263 | } |
| 1264 | fprintf( stderr, "[%d %d %d]", |
| 1265 | cell->x, cell->area, cell->cover ); |
| 1266 | } |
| 1267 | fprintf(stderr, "\n" ); |
| 1268 | } |
| 1269 | |
| 1270 | #endif /* DEBUG_GRAYS */ |
| 1271 | |
| 1272 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1273 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1274 | gray_hline( RAS_ARG_ TScan x, |
| 1275 | TScan y, |
| 1276 | TPos area, |
| 1277 | int acount ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1278 | { |
| 1279 | FT_Span* span; |
| 1280 | int count; |
| 1281 | int coverage; |
| 1282 | |
| 1283 | |
| 1284 | /* compute the coverage line's coverage, depending on the */ |
| 1285 | /* outline fill rule */ |
| 1286 | /* */ |
| 1287 | /* the coverage percentage is area/(PIXEL_BITS*PIXEL_BITS*2) */ |
| 1288 | /* */ |
| 1289 | coverage = area >> ( PIXEL_BITS * 2 + 1 - 8); /* use range 0..256 */ |
| 1290 | |
| 1291 | if ( ras.outline.flags & ft_outline_even_odd_fill ) |
| 1292 | { |
| 1293 | if ( coverage < 0 ) |
| 1294 | coverage = -coverage; |
| 1295 | |
| 1296 | while ( coverage >= 512 ) |
| 1297 | coverage -= 512; |
| 1298 | |
| 1299 | if ( coverage > 256 ) |
| 1300 | coverage = 512 - coverage; |
| 1301 | else if ( coverage == 256 ) |
| 1302 | coverage = 255; |
| 1303 | } |
| 1304 | else |
| 1305 | { |
| 1306 | /* normal non-zero winding rule */ |
| 1307 | if ( coverage < 0 ) |
| 1308 | coverage = -coverage; |
| 1309 | |
| 1310 | if ( coverage >= 256 ) |
| 1311 | coverage = 255; |
| 1312 | } |
| 1313 | |
| 1314 | y += ras.min_ey; |
| 1315 | x += ras.min_ex; |
| 1316 | |
| 1317 | if ( coverage ) |
| 1318 | { |
| 1319 | /* see if we can add this span to the current list */ |
| 1320 | count = ras.num_gray_spans; |
| 1321 | span = ras.gray_spans + count - 1; |
| 1322 | if ( count > 0 && |
| 1323 | ras.span_y == y && |
| 1324 | (int)span->x + span->len == (int)x && |
| 1325 | span->coverage == coverage ) |
| 1326 | { |
Werner Lemberg | 8eb0353 | 2001-06-19 23:03:41 +0000 | [diff] [blame] | 1327 | span->len = (unsigned short)( span->len + acount ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1328 | return; |
| 1329 | } |
| 1330 | |
| 1331 | if ( ras.span_y != y || count >= FT_MAX_GRAY_SPANS ) |
| 1332 | { |
David Turner | b71c6af | 2000-09-17 17:17:16 +0000 | [diff] [blame] | 1333 | if ( ras.render_span && count > 0 ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1334 | ras.render_span( ras.span_y, count, ras.gray_spans, |
| 1335 | ras.render_span_data ); |
| 1336 | /* ras.render_span( span->y, ras.gray_spans, count ); */ |
| 1337 | |
| 1338 | #ifdef DEBUG_GRAYS |
| 1339 | |
| 1340 | if ( ras.span_y >= 0 ) |
| 1341 | { |
| 1342 | int n; |
| 1343 | |
| 1344 | |
| 1345 | fprintf( stderr, "y=%3d ", ras.span_y ); |
| 1346 | span = ras.gray_spans; |
| 1347 | for ( n = 0; n < count; n++, span++ ) |
| 1348 | fprintf( stderr, "[%d..%d]:%02x ", |
| 1349 | span->x, span->x + span->len - 1, span->coverage ); |
| 1350 | fprintf( stderr, "\n" ); |
| 1351 | } |
| 1352 | |
| 1353 | #endif /* DEBUG_GRAYS */ |
| 1354 | |
| 1355 | ras.num_gray_spans = 0; |
| 1356 | ras.span_y = y; |
| 1357 | |
| 1358 | count = 0; |
| 1359 | span = ras.gray_spans; |
| 1360 | } |
| 1361 | else |
| 1362 | span++; |
| 1363 | |
| 1364 | /* add a gray span to the current list */ |
| 1365 | span->x = (short)x; |
| 1366 | span->len = (unsigned short)acount; |
| 1367 | span->coverage = (unsigned char)coverage; |
| 1368 | ras.num_gray_spans++; |
| 1369 | } |
| 1370 | } |
| 1371 | |
| 1372 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1373 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1374 | gray_sweep( RAS_ARG_ FT_Bitmap* target ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1375 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1376 | TScan x, y, cover; |
| 1377 | TArea area; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1378 | PCell start, cur, limit; |
| 1379 | |
David Turner | c6a9220 | 2000-07-04 18:12:13 +0000 | [diff] [blame] | 1380 | FT_UNUSED( target ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1381 | |
David Turner | 5aeaad6 | 2001-02-23 17:47:41 +0000 | [diff] [blame] | 1382 | if ( ras.num_cells == 0 ) |
| 1383 | return; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1384 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1385 | cur = ras.cells; |
| 1386 | limit = cur + ras.num_cells; |
| 1387 | |
| 1388 | cover = 0; |
| 1389 | ras.span_y = -1; |
| 1390 | ras.num_gray_spans = 0; |
| 1391 | |
| 1392 | for (;;) |
| 1393 | { |
| 1394 | start = cur; |
| 1395 | y = start->y; |
| 1396 | x = start->x; |
| 1397 | |
| 1398 | area = start->area; |
| 1399 | cover += start->cover; |
| 1400 | |
| 1401 | /* accumulate all start cells */ |
| 1402 | for (;;) |
| 1403 | { |
| 1404 | ++cur; |
| 1405 | if ( cur >= limit || cur->y != start->y || cur->x != start->x ) |
| 1406 | break; |
| 1407 | |
| 1408 | area += cur->area; |
| 1409 | cover += cur->cover; |
| 1410 | } |
| 1411 | |
| 1412 | /* if the start cell has a non-null area, we must draw an */ |
| 1413 | /* individual gray pixel there */ |
| 1414 | if ( area && x >= 0 ) |
| 1415 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1416 | gray_hline( RAS_VAR_ x, y, cover * ( ONE_PIXEL * 2 ) - area, 1 ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1417 | x++; |
| 1418 | } |
| 1419 | |
| 1420 | if ( x < 0 ) |
| 1421 | x = 0; |
| 1422 | |
| 1423 | if ( cur < limit && start->y == cur->y ) |
| 1424 | { |
| 1425 | /* draw a gray span between the start cell and the current one */ |
| 1426 | if ( cur->x > x ) |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1427 | gray_hline( RAS_VAR_ x, y, |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1428 | cover * ( ONE_PIXEL * 2 ), cur->x - x ); |
| 1429 | } |
| 1430 | else |
| 1431 | { |
| 1432 | /* draw a gray span until the end of the clipping region */ |
| 1433 | if ( cover && x < ras.max_ex - ras.min_ex ) |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1434 | gray_hline( RAS_VAR_ x, y, |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1435 | cover * ( ONE_PIXEL * 2 ), |
| 1436 | ras.max_ex - x - ras.min_ex ); |
| 1437 | cover = 0; |
| 1438 | } |
| 1439 | |
| 1440 | if ( cur >= limit ) |
| 1441 | break; |
| 1442 | } |
| 1443 | |
| 1444 | if ( ras.render_span && ras.num_gray_spans > 0 ) |
| 1445 | ras.render_span( ras.span_y, ras.num_gray_spans, |
| 1446 | ras.gray_spans, ras.render_span_data ); |
| 1447 | |
| 1448 | #ifdef DEBUG_GRAYS |
| 1449 | |
| 1450 | { |
| 1451 | int n; |
| 1452 | FT_Span* span; |
| 1453 | |
| 1454 | |
| 1455 | fprintf( stderr, "y=%3d ", ras.span_y ); |
| 1456 | span = ras.gray_spans; |
| 1457 | for ( n = 0; n < ras.num_gray_spans; n++, span++ ) |
| 1458 | fprintf( stderr, "[%d..%d]:%02x ", |
| 1459 | span->x, span->x + span->len - 1, span->coverage ); |
| 1460 | fprintf( stderr, "\n" ); |
| 1461 | } |
| 1462 | |
| 1463 | #endif /* DEBUG_GRAYS */ |
| 1464 | |
| 1465 | } |
| 1466 | |
| 1467 | |
| 1468 | #ifdef _STANDALONE_ |
| 1469 | |
| 1470 | /*************************************************************************/ |
| 1471 | /* */ |
| 1472 | /* The following function should only compile in stand_alone mode, */ |
| 1473 | /* i.e., when building this component without the rest of FreeType. */ |
| 1474 | /* */ |
| 1475 | /*************************************************************************/ |
| 1476 | |
| 1477 | /*************************************************************************/ |
| 1478 | /* */ |
| 1479 | /* <Function> */ |
| 1480 | /* FT_Outline_Decompose */ |
| 1481 | /* */ |
| 1482 | /* <Description> */ |
| 1483 | /* Walks over an outline's structure to decompose it into individual */ |
| 1484 | /* segments and Bezier arcs. This function is also able to emit */ |
| 1485 | /* `move to' and `close to' operations to indicate the start and end */ |
| 1486 | /* of new contours in the outline. */ |
| 1487 | /* */ |
| 1488 | /* <Input> */ |
| 1489 | /* outline :: A pointer to the source target. */ |
| 1490 | /* */ |
| 1491 | /* interface :: A table of `emitters', i.e,. function pointers called */ |
| 1492 | /* during decomposition to indicate path operations. */ |
| 1493 | /* */ |
| 1494 | /* user :: A typeless pointer which is passed to each emitter */ |
| 1495 | /* during the decomposition. It can be used to store */ |
| 1496 | /* the state during the decomposition. */ |
| 1497 | /* */ |
| 1498 | /* <Return> */ |
| 1499 | /* Error code. 0 means sucess. */ |
| 1500 | /* */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1501 | static |
| 1502 | int FT_Outline_Decompose( FT_Outline* outline, |
| 1503 | const FT_Outline_Funcs* interface, |
| 1504 | void* user ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1505 | { |
| 1506 | #undef SCALED |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1507 | #if 0 |
| 1508 | # define SCALED( x ) ( ( (x) << shift ) - delta ) |
| 1509 | #else |
| 1510 | # define SCALED( x) (x) |
| 1511 | #endif |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1512 | |
| 1513 | FT_Vector v_last; |
| 1514 | FT_Vector v_control; |
| 1515 | FT_Vector v_start; |
| 1516 | |
| 1517 | FT_Vector* point; |
| 1518 | FT_Vector* limit; |
| 1519 | char* tags; |
| 1520 | |
| 1521 | int n; /* index of contour in outline */ |
| 1522 | int first; /* index of first point in contour */ |
| 1523 | int error; |
| 1524 | char tag; /* current point's state */ |
| 1525 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1526 | #if 0 |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1527 | int shift = interface->shift; |
| 1528 | FT_Pos delta = interface->delta; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1529 | #endif |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1530 | |
| 1531 | |
| 1532 | first = 0; |
| 1533 | |
| 1534 | for ( n = 0; n < outline->n_contours; n++ ) |
| 1535 | { |
| 1536 | int last; /* index of last point in contour */ |
| 1537 | |
| 1538 | |
| 1539 | last = outline->contours[n]; |
| 1540 | limit = outline->points + last; |
| 1541 | |
| 1542 | v_start = outline->points[first]; |
| 1543 | v_last = outline->points[last]; |
| 1544 | |
| 1545 | v_start.x = SCALED( v_start.x ); v_start.y = SCALED( v_start.y ); |
| 1546 | v_last.x = SCALED( v_last.x ); v_last.y = SCALED( v_last.y ); |
| 1547 | |
| 1548 | v_control = v_start; |
| 1549 | |
| 1550 | point = outline->points + first; |
| 1551 | tags = outline->tags + first; |
| 1552 | tag = FT_CURVE_TAG( tags[0] ); |
| 1553 | |
| 1554 | /* A contour cannot start with a cubic control point! */ |
| 1555 | if ( tag == FT_Curve_Tag_Cubic ) |
| 1556 | goto Invalid_Outline; |
| 1557 | |
| 1558 | /* check first point to determine origin */ |
| 1559 | if ( tag == FT_Curve_Tag_Conic ) |
| 1560 | { |
| 1561 | /* first point is conic control. Yes, this happens. */ |
| 1562 | if ( FT_CURVE_TAG( outline->tags[last] ) == FT_Curve_Tag_On ) |
| 1563 | { |
| 1564 | /* start at last point if it is on the curve */ |
| 1565 | v_start = v_last; |
| 1566 | limit--; |
| 1567 | } |
| 1568 | else |
| 1569 | { |
| 1570 | /* if both first and last points are conic, */ |
| 1571 | /* start at their middle and record its position */ |
| 1572 | /* for closure */ |
| 1573 | v_start.x = ( v_start.x + v_last.x ) / 2; |
| 1574 | v_start.y = ( v_start.y + v_last.y ) / 2; |
| 1575 | |
| 1576 | v_last = v_start; |
| 1577 | } |
| 1578 | point--; |
| 1579 | tags--; |
| 1580 | } |
| 1581 | |
| 1582 | error = interface->move_to( &v_start, user ); |
| 1583 | if ( error ) |
| 1584 | goto Exit; |
| 1585 | |
| 1586 | while ( point < limit ) |
| 1587 | { |
| 1588 | point++; |
| 1589 | tags++; |
| 1590 | |
| 1591 | tag = FT_CURVE_TAG( tags[0] ); |
| 1592 | switch ( tag ) |
| 1593 | { |
| 1594 | case FT_Curve_Tag_On: /* emit a single line_to */ |
| 1595 | { |
| 1596 | FT_Vector vec; |
| 1597 | |
| 1598 | |
| 1599 | vec.x = SCALED( point->x ); |
| 1600 | vec.y = SCALED( point->y ); |
| 1601 | |
| 1602 | error = interface->line_to( &vec, user ); |
| 1603 | if ( error ) |
| 1604 | goto Exit; |
| 1605 | continue; |
| 1606 | } |
| 1607 | |
| 1608 | case FT_Curve_Tag_Conic: /* consume conic arcs */ |
| 1609 | { |
| 1610 | v_control.x = SCALED( point->x ); |
| 1611 | v_control.y = SCALED( point->y ); |
| 1612 | |
| 1613 | Do_Conic: |
| 1614 | if ( point < limit ) |
| 1615 | { |
| 1616 | FT_Vector vec; |
| 1617 | FT_Vector v_middle; |
| 1618 | |
| 1619 | |
| 1620 | point++; |
| 1621 | tags++; |
| 1622 | tag = FT_CURVE_TAG( tags[0] ); |
| 1623 | |
| 1624 | vec.x = SCALED( point->x ); |
| 1625 | vec.y = SCALED( point->y ); |
| 1626 | |
| 1627 | if ( tag == FT_Curve_Tag_On ) |
| 1628 | { |
| 1629 | error = interface->conic_to( &v_control, &vec, user ); |
| 1630 | if ( error ) |
| 1631 | goto Exit; |
| 1632 | continue; |
| 1633 | } |
| 1634 | |
| 1635 | if ( tag != FT_Curve_Tag_Conic ) |
| 1636 | goto Invalid_Outline; |
| 1637 | |
| 1638 | v_middle.x = ( v_control.x + vec.x ) / 2; |
| 1639 | v_middle.y = ( v_control.y + vec.y ) / 2; |
| 1640 | |
| 1641 | error = interface->conic_to( &v_control, &v_middle, user ); |
| 1642 | if ( error ) |
| 1643 | goto Exit; |
| 1644 | |
| 1645 | v_control = vec; |
| 1646 | goto Do_Conic; |
| 1647 | } |
| 1648 | |
| 1649 | error = interface->conic_to( &v_control, &v_start, user ); |
| 1650 | goto Close; |
| 1651 | } |
| 1652 | |
| 1653 | default: /* FT_Curve_Tag_Cubic */ |
| 1654 | { |
| 1655 | FT_Vector vec1, vec2; |
| 1656 | |
| 1657 | |
| 1658 | if ( point + 1 > limit || |
| 1659 | FT_CURVE_TAG( tags[1] ) != FT_Curve_Tag_Cubic ) |
| 1660 | goto Invalid_Outline; |
| 1661 | |
| 1662 | point += 2; |
| 1663 | tags += 2; |
| 1664 | |
| 1665 | vec1.x = SCALED( point[-2].x ); vec1.y = SCALED( point[-2].y ); |
| 1666 | vec2.x = SCALED( point[-1].x ); vec2.y = SCALED( point[-1].y ); |
| 1667 | |
| 1668 | if ( point <= limit ) |
| 1669 | { |
| 1670 | FT_Vector vec; |
| 1671 | |
| 1672 | |
| 1673 | vec.x = SCALED( point->x ); |
| 1674 | vec.y = SCALED( point->y ); |
| 1675 | |
| 1676 | error = interface->cubic_to( &vec1, &vec2, &vec, user ); |
| 1677 | if ( error ) |
| 1678 | goto Exit; |
| 1679 | continue; |
| 1680 | } |
| 1681 | |
| 1682 | error = interface->cubic_to( &vec1, &vec2, &v_start, user ); |
| 1683 | goto Close; |
| 1684 | } |
| 1685 | } |
| 1686 | } |
| 1687 | |
| 1688 | /* close the contour with a line segment */ |
| 1689 | error = interface->line_to( &v_start, user ); |
| 1690 | |
| 1691 | Close: |
| 1692 | if ( error ) |
| 1693 | goto Exit; |
| 1694 | |
| 1695 | first = last + 1; |
| 1696 | } |
| 1697 | |
| 1698 | return 0; |
| 1699 | |
| 1700 | Exit: |
| 1701 | return error; |
| 1702 | |
| 1703 | Invalid_Outline: |
| 1704 | return ErrRaster_Invalid_Outline; |
| 1705 | } |
| 1706 | |
| 1707 | #endif /* _STANDALONE_ */ |
| 1708 | |
| 1709 | |
| 1710 | typedef struct TBand_ |
| 1711 | { |
| 1712 | FT_Pos min, max; |
| 1713 | |
| 1714 | } TBand; |
| 1715 | |
| 1716 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1717 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1718 | gray_convert_glyph_inner( RAS_ARG ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1719 | { |
| 1720 | static |
David Turner | dc26e7b | 2000-10-23 22:46:56 +0000 | [diff] [blame] | 1721 | const FT_Outline_Funcs interface = |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1722 | { |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1723 | (FT_Outline_MoveTo_Func) gray_move_to, |
| 1724 | (FT_Outline_LineTo_Func) gray_line_to, |
| 1725 | (FT_Outline_ConicTo_Func) gray_conic_to, |
| 1726 | (FT_Outline_CubicTo_Func) gray_cubic_to, |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1727 | 0, |
| 1728 | 0 |
| 1729 | }; |
| 1730 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1731 | volatile int error = 0; |
| 1732 | |
| 1733 | if ( setjmp( ras.jump_buffer ) == 0 ) |
| 1734 | { |
| 1735 | error = FT_Outline_Decompose( &ras.outline, &interface, &ras ); |
| 1736 | gray_record_cell( RAS_VAR ); |
| 1737 | } |
| 1738 | else |
| 1739 | { |
| 1740 | error = ErrRaster_MemoryOverflow; |
| 1741 | } |
| 1742 | |
| 1743 | return error; |
| 1744 | } |
| 1745 | |
| 1746 | |
| 1747 | static int |
| 1748 | gray_convert_glyph( RAS_ARG ) |
| 1749 | { |
Werner Lemberg | 594f0c9 | 2000-12-20 22:09:41 +0000 | [diff] [blame] | 1750 | TBand bands[40], *band; |
| 1751 | int n, num_bands; |
| 1752 | TPos min, max, max_y; |
| 1753 | FT_BBox* clip; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1754 | |
| 1755 | |
| 1756 | /* Set up state in the raster object */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1757 | gray_compute_cbox( RAS_VAR ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1758 | |
| 1759 | /* clip to target bitmap, exit if nothing to do */ |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1760 | clip = &ras.clip_box; |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1761 | |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1762 | if ( ras.max_ex <= clip->xMin || ras.min_ex >= clip->xMax || |
| 1763 | ras.max_ey <= clip->yMin || ras.min_ey >= clip->yMax ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1764 | return 0; |
| 1765 | |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1766 | if ( ras.min_ex < clip->xMin ) ras.min_ex = clip->xMin; |
| 1767 | if ( ras.min_ey < clip->yMin ) ras.min_ey = clip->yMin; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1768 | |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1769 | if ( ras.max_ex > clip->xMax ) ras.max_ex = clip->xMax; |
| 1770 | if ( ras.max_ey > clip->yMax ) ras.max_ey = clip->yMax; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1771 | |
Werner Lemberg | fbeb41d | 2000-07-02 00:27:53 +0000 | [diff] [blame] | 1772 | /* simple heuristic used to speed-up the bezier decomposition -- see */ |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1773 | /* the code in gray_render_conic() and gray_render_cubic() for more details */ |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1774 | ras.conic_level = 32; |
| 1775 | ras.cubic_level = 16; |
| 1776 | |
| 1777 | { |
| 1778 | int level = 0; |
| 1779 | |
| 1780 | |
| 1781 | if ( ras.max_ex > 24 || ras.max_ey > 24 ) |
| 1782 | level++; |
| 1783 | if ( ras.max_ex > 120 || ras.max_ey > 120 ) |
Werner Lemberg | f9b0375 | 2000-09-11 22:50:13 +0000 | [diff] [blame] | 1784 | level++; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1785 | |
| 1786 | ras.conic_level <<= level; |
| 1787 | ras.cubic_level <<= level; |
| 1788 | } |
| 1789 | |
| 1790 | /* setup vertical bands */ |
| 1791 | num_bands = ( ras.max_ey - ras.min_ey ) / ras.band_size; |
| 1792 | if ( num_bands == 0 ) num_bands = 1; |
| 1793 | if ( num_bands >= 39 ) num_bands = 39; |
| 1794 | |
| 1795 | ras.band_shoot = 0; |
| 1796 | |
| 1797 | min = ras.min_ey; |
| 1798 | max_y = ras.max_ey; |
| 1799 | |
| 1800 | for ( n = 0; n < num_bands; n++, min = max ) |
| 1801 | { |
| 1802 | max = min + ras.band_size; |
| 1803 | if ( n == num_bands - 1 || max > max_y ) |
| 1804 | max = max_y; |
| 1805 | |
| 1806 | bands[0].min = min; |
| 1807 | bands[0].max = max; |
| 1808 | band = bands; |
| 1809 | |
| 1810 | while ( band >= bands ) |
| 1811 | { |
| 1812 | FT_Pos bottom, top, middle; |
| 1813 | int error; |
| 1814 | |
| 1815 | |
| 1816 | ras.num_cells = 0; |
| 1817 | ras.invalid = 1; |
| 1818 | ras.min_ey = band->min; |
| 1819 | ras.max_ey = band->max; |
| 1820 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1821 | #if 1 |
| 1822 | error = gray_convert_glyph_inner( RAS_VAR ); |
| 1823 | #else |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1824 | error = FT_Outline_Decompose( outline, &interface, &ras ) || |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1825 | gray_record_cell( RAS_VAR ); |
| 1826 | #endif |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1827 | |
| 1828 | if ( !error ) |
| 1829 | { |
| 1830 | #ifdef SHELL_SORT |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1831 | gray_shell_sort( ras.cells, ras.num_cells ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1832 | #else |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1833 | gray_quick_sort( ras.cells, ras.num_cells ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1834 | #endif |
| 1835 | |
| 1836 | #ifdef DEBUG_GRAYS |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1837 | gray_check_sort( ras.cells, ras.num_cells ); |
| 1838 | gray_dump_cells( RAS_VAR ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1839 | #endif |
| 1840 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1841 | gray_sweep( RAS_VAR_ &ras.target ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1842 | band--; |
| 1843 | continue; |
| 1844 | } |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1845 | else if ( error != ErrRaster_MemoryOverflow ) |
| 1846 | return 1; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1847 | |
| 1848 | /* render pool overflow, we will reduce the render band by half */ |
| 1849 | bottom = band->min; |
| 1850 | top = band->max; |
| 1851 | middle = bottom + ( ( top - bottom ) >> 1 ); |
| 1852 | |
| 1853 | /* waoow! This is too complex for a single scanline, something */ |
| 1854 | /* must be really rotten here! */ |
| 1855 | if ( middle == bottom ) |
| 1856 | { |
| 1857 | #ifdef DEBUG_GRAYS |
| 1858 | fprintf( stderr, "Rotten glyph!\n" ); |
| 1859 | #endif |
| 1860 | return 1; |
| 1861 | } |
| 1862 | |
| 1863 | if ( bottom-top >= ras.band_size ) |
| 1864 | ras.band_shoot++; |
| 1865 | |
| 1866 | band[1].min = bottom; |
| 1867 | band[1].max = middle; |
| 1868 | band[0].min = middle; |
| 1869 | band[0].max = top; |
| 1870 | band++; |
| 1871 | } |
| 1872 | } |
| 1873 | |
| 1874 | if ( ras.band_shoot > 8 && ras.band_size > 16 ) |
| 1875 | ras.band_size = ras.band_size / 2; |
| 1876 | |
| 1877 | return 0; |
| 1878 | } |
| 1879 | |
| 1880 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1881 | extern int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1882 | gray_raster_render( PRaster raster, |
| 1883 | FT_Raster_Params* params ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1884 | { |
| 1885 | FT_Outline* outline = (FT_Outline*)params->source; |
| 1886 | FT_Bitmap* target_map = params->target; |
| 1887 | |
| 1888 | |
| 1889 | if ( !raster || !raster->cells || !raster->max_cells ) |
| 1890 | return -1; |
| 1891 | |
| 1892 | /* return immediately if the outline is empty */ |
| 1893 | if ( outline->n_points == 0 || outline->n_contours <= 0 ) |
| 1894 | return 0; |
| 1895 | |
| 1896 | if ( !outline || !outline->contours || !outline->points ) |
| 1897 | return ErrRaster_Invalid_Outline; |
| 1898 | |
| 1899 | if ( outline->n_points != |
| 1900 | outline->contours[outline->n_contours - 1] + 1 ) |
| 1901 | return ErrRaster_Invalid_Outline; |
| 1902 | |
David Turner | 78dd710 | 2000-10-03 19:13:11 +0000 | [diff] [blame] | 1903 | /* if direct mode is not set, we must have a target bitmap */ |
Werner Lemberg | 6fbe4db | 2000-10-05 04:53:31 +0000 | [diff] [blame] | 1904 | if ( ( params->flags & ft_raster_flag_direct ) == 0 && |
| 1905 | ( !target_map || !target_map->buffer ) ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1906 | return -1; |
| 1907 | |
David Turner | 78dd710 | 2000-10-03 19:13:11 +0000 | [diff] [blame] | 1908 | /* this version does not support monochrome rendering */ |
Werner Lemberg | 6fbe4db | 2000-10-05 04:53:31 +0000 | [diff] [blame] | 1909 | if ( !( params->flags & ft_raster_flag_aa ) ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1910 | return ErrRaster_Invalid_Mode; |
| 1911 | |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1912 | /* compute clipping box */ |
Werner Lemberg | 594f0c9 | 2000-12-20 22:09:41 +0000 | [diff] [blame] | 1913 | if ( ( params->flags & ft_raster_flag_direct ) == 0 ) |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1914 | { |
| 1915 | /* compute clip box from target pixmap */ |
| 1916 | ras.clip_box.xMin = 0; |
| 1917 | ras.clip_box.yMin = 0; |
| 1918 | ras.clip_box.xMax = target_map->width; |
| 1919 | ras.clip_box.yMax = target_map->rows; |
| 1920 | } |
| 1921 | else if ( params->flags & ft_raster_flag_clip ) |
| 1922 | { |
| 1923 | ras.clip_box = params->clip_box; |
| 1924 | } |
| 1925 | else |
| 1926 | { |
Werner Lemberg | cf24d51 | 2001-06-18 14:23:45 +0000 | [diff] [blame] | 1927 | ras.clip_box.xMin = -32768L; |
| 1928 | ras.clip_box.yMin = -32768L; |
| 1929 | ras.clip_box.xMax = 32767L; |
| 1930 | ras.clip_box.yMax = 32767L; |
David Turner | 859a18a | 2000-12-14 18:50:40 +0000 | [diff] [blame] | 1931 | } |
| 1932 | |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1933 | ras.outline = *outline; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1934 | ras.num_cells = 0; |
| 1935 | ras.invalid = 1; |
| 1936 | |
Werner Lemberg | 6fbe4db | 2000-10-05 04:53:31 +0000 | [diff] [blame] | 1937 | if ( target_map ) |
David Turner | 78dd710 | 2000-10-03 19:13:11 +0000 | [diff] [blame] | 1938 | ras.target = *target_map; |
David Turner | 78dd710 | 2000-10-03 19:13:11 +0000 | [diff] [blame] | 1939 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1940 | ras.render_span = (FT_Raster_Span_Func)gray_render_span; |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1941 | ras.render_span_data = &ras; |
| 1942 | |
| 1943 | if ( params->flags & ft_raster_flag_direct ) |
| 1944 | { |
| 1945 | ras.render_span = (FT_Raster_Span_Func)params->gray_spans; |
| 1946 | ras.render_span_data = params->user; |
| 1947 | } |
| 1948 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1949 | return gray_convert_glyph( (PRaster)raster ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1950 | } |
| 1951 | |
| 1952 | |
| 1953 | /**** RASTER OBJECT CREATION: In standalone mode, we simply use *****/ |
| 1954 | /**** a static object. *****/ |
| 1955 | |
| 1956 | #ifdef _STANDALONE_ |
| 1957 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1958 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1959 | gray_raster_new( void* memory, |
| 1960 | FT_Raster* araster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1961 | { |
| 1962 | static TRaster the_raster; |
| 1963 | |
David Turner | c6a9220 | 2000-07-04 18:12:13 +0000 | [diff] [blame] | 1964 | FT_UNUSED( memory ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1965 | |
| 1966 | |
| 1967 | *araster = (FT_Raster)&the_raster; |
| 1968 | memset( &the_raster, 0, sizeof ( the_raster ) ); |
| 1969 | |
| 1970 | return 0; |
| 1971 | } |
| 1972 | |
| 1973 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1974 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1975 | gray_raster_done( FT_Raster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1976 | { |
| 1977 | /* nothing */ |
David Turner | c6a9220 | 2000-07-04 18:12:13 +0000 | [diff] [blame] | 1978 | FT_UNUSED( raster ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1979 | } |
| 1980 | |
| 1981 | #else /* _STANDALONE_ */ |
| 1982 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 1983 | static int |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 1984 | gray_raster_new( FT_Memory memory, |
| 1985 | FT_Raster* araster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 1986 | { |
| 1987 | FT_Error error; |
| 1988 | PRaster raster; |
| 1989 | |
| 1990 | |
| 1991 | *araster = 0; |
| 1992 | if ( !ALLOC( raster, sizeof ( TRaster ) ) ) |
| 1993 | { |
| 1994 | raster->memory = memory; |
| 1995 | *araster = (FT_Raster)raster; |
| 1996 | } |
| 1997 | |
| 1998 | return error; |
| 1999 | } |
| 2000 | |
| 2001 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 2002 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 2003 | gray_raster_done( FT_Raster raster ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 2004 | { |
| 2005 | FT_Memory memory = (FT_Memory)((PRaster)raster)->memory; |
| 2006 | |
| 2007 | |
| 2008 | FREE( raster ); |
| 2009 | } |
| 2010 | |
| 2011 | #endif /* _STANDALONE_ */ |
| 2012 | |
| 2013 | |
Werner Lemberg | 52005c3 | 2001-06-27 23:25:46 +0000 | [diff] [blame] | 2014 | static void |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 2015 | gray_raster_reset( FT_Raster raster, |
| 2016 | const char* pool_base, |
| 2017 | long pool_size ) |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 2018 | { |
| 2019 | PRaster rast = (PRaster)raster; |
| 2020 | |
| 2021 | |
| 2022 | if ( raster && pool_base && pool_size >= 4096 ) |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 2023 | gray_init_cells( rast, (char*)pool_base, pool_size ); |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 2024 | |
| 2025 | rast->band_size = ( pool_size / sizeof ( TCell ) ) / 8; |
| 2026 | } |
| 2027 | |
| 2028 | |
David Turner | dc26e7b | 2000-10-23 22:46:56 +0000 | [diff] [blame] | 2029 | const FT_Raster_Funcs ft_grays_raster = |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 2030 | { |
| 2031 | ft_glyph_format_outline, |
| 2032 | |
David Turner | c4f622c | 2001-10-07 10:39:03 +0000 | [diff] [blame^] | 2033 | (FT_Raster_New_Func) gray_raster_new, |
| 2034 | (FT_Raster_Reset_Func) gray_raster_reset, |
| 2035 | (FT_Raster_Set_Mode_Func) 0, |
| 2036 | (FT_Raster_Render_Func) gray_raster_render, |
| 2037 | (FT_Raster_Done_Func) gray_raster_done |
David Turner | 5ae1bad | 2000-06-27 23:18:39 +0000 | [diff] [blame] | 2038 | }; |
| 2039 | |
| 2040 | |
| 2041 | /* END */ |