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1 /***************************************************************************/
2 /*                                                                         */
3 /*  ftbitmap.c                                                             */
4 /*                                                                         */
5 /*    FreeType utility functions for bitmaps (body).                       */
6 /*                                                                         */
7 /*  Copyright 2004, 2005, 2006, 2007, 2008, 2009 by                        */
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 #include <ft2build.h>
20 #include FT_BITMAP_H
21 #include FT_IMAGE_H
22 #include FT_INTERNAL_OBJECTS_H
23 
24 
25   static
26   const FT_Bitmap  null_bitmap = { 0, 0, 0, 0, 0, 0, 0, 0 };
27 
28 
29   /* documentation is in ftbitmap.h */
30 
31   FT_EXPORT_DEF( void )
FT_Bitmap_New(FT_Bitmap * abitmap)32   FT_Bitmap_New( FT_Bitmap  *abitmap )
33   {
34     *abitmap = null_bitmap;
35   }
36 
37 
38   /* documentation is in ftbitmap.h */
39 
40   FT_EXPORT_DEF( FT_Error )
FT_Bitmap_Copy(FT_Library library,const FT_Bitmap * source,FT_Bitmap * target)41   FT_Bitmap_Copy( FT_Library        library,
42                   const FT_Bitmap  *source,
43                   FT_Bitmap        *target)
44   {
45     FT_Memory  memory = library->memory;
46     FT_Error   error  = FT_Err_Ok;
47     FT_Int     pitch  = source->pitch;
48     FT_ULong   size;
49 
50 
51     if ( source == target )
52       return FT_Err_Ok;
53 
54     if ( source->buffer == NULL )
55     {
56       *target = *source;
57 
58       return FT_Err_Ok;
59     }
60 
61     if ( pitch < 0 )
62       pitch = -pitch;
63     size = (FT_ULong)( pitch * source->rows );
64 
65     if ( target->buffer )
66     {
67       FT_Int    target_pitch = target->pitch;
68       FT_ULong  target_size;
69 
70 
71       if ( target_pitch < 0  )
72         target_pitch = -target_pitch;
73       target_size = (FT_ULong)( target_pitch * target->rows );
74 
75       if ( target_size != size )
76         (void)FT_QREALLOC( target->buffer, target_size, size );
77     }
78     else
79       (void)FT_QALLOC( target->buffer, size );
80 
81     if ( !error )
82     {
83       unsigned char *p;
84 
85 
86       p = target->buffer;
87       *target = *source;
88       target->buffer = p;
89 
90       FT_MEM_COPY( target->buffer, source->buffer, size );
91     }
92 
93     return error;
94   }
95 
96 
97   static FT_Error
ft_bitmap_assure_buffer(FT_Memory memory,FT_Bitmap * bitmap,FT_UInt xpixels,FT_UInt ypixels)98   ft_bitmap_assure_buffer( FT_Memory   memory,
99                            FT_Bitmap*  bitmap,
100                            FT_UInt     xpixels,
101                            FT_UInt     ypixels )
102   {
103     FT_Error        error;
104     int             pitch;
105     int             new_pitch;
106     FT_UInt         bpp;
107     FT_Int          i, width, height;
108     unsigned char*  buffer = NULL;
109 
110 
111     width  = bitmap->width;
112     height = bitmap->rows;
113     pitch  = bitmap->pitch;
114     if ( pitch < 0 )
115       pitch = -pitch;
116 
117     switch ( bitmap->pixel_mode )
118     {
119     case FT_PIXEL_MODE_MONO:
120       bpp       = 1;
121       new_pitch = ( width + xpixels + 7 ) >> 3;
122       break;
123     case FT_PIXEL_MODE_GRAY2:
124       bpp       = 2;
125       new_pitch = ( width + xpixels + 3 ) >> 2;
126       break;
127     case FT_PIXEL_MODE_GRAY4:
128       bpp       = 4;
129       new_pitch = ( width + xpixels + 1 ) >> 1;
130       break;
131     case FT_PIXEL_MODE_GRAY:
132     case FT_PIXEL_MODE_LCD:
133     case FT_PIXEL_MODE_LCD_V:
134       bpp       = 8;
135       new_pitch = ( width + xpixels );
136       break;
137     default:
138       return FT_Err_Invalid_Glyph_Format;
139     }
140 
141     /* if no need to allocate memory */
142     if ( ypixels == 0 && new_pitch <= pitch )
143     {
144       /* zero the padding */
145       FT_Int  bit_width = pitch * 8;
146       FT_Int  bit_last  = ( width + xpixels ) * bpp;
147 
148 
149       if ( bit_last < bit_width )
150       {
151         FT_Byte*  line  = bitmap->buffer + ( bit_last >> 3 );
152         FT_Byte*  end   = bitmap->buffer + pitch;
153         FT_Int    shift = bit_last & 7;
154         FT_UInt   mask  = 0xFF00U >> shift;
155         FT_Int    count = height;
156 
157 
158         for ( ; count > 0; count--, line += pitch, end += pitch )
159         {
160           FT_Byte*  write = line;
161 
162 
163           if ( shift > 0 )
164           {
165             write[0] = (FT_Byte)( write[0] & mask );
166             write++;
167           }
168           if ( write < end )
169             FT_MEM_ZERO( write, end-write );
170         }
171       }
172 
173       return FT_Err_Ok;
174     }
175 
176     if ( FT_QALLOC_MULT( buffer, new_pitch, bitmap->rows + ypixels ) )
177       return error;
178 
179     if ( bitmap->pitch > 0 )
180     {
181       FT_Int  len = ( width * bpp + 7 ) >> 3;
182 
183 
184       for ( i = 0; i < bitmap->rows; i++ )
185         FT_MEM_COPY( buffer + new_pitch * ( ypixels + i ),
186                      bitmap->buffer + pitch * i, len );
187     }
188     else
189     {
190       FT_Int  len = ( width * bpp + 7 ) >> 3;
191 
192 
193       for ( i = 0; i < bitmap->rows; i++ )
194         FT_MEM_COPY( buffer + new_pitch * i,
195                      bitmap->buffer + pitch * i, len );
196     }
197 
198     FT_FREE( bitmap->buffer );
199     bitmap->buffer = buffer;
200 
201     if ( bitmap->pitch < 0 )
202       new_pitch = -new_pitch;
203 
204     /* set pitch only, width and height are left untouched */
205     bitmap->pitch = new_pitch;
206 
207     return FT_Err_Ok;
208   }
209 
210 
211   /* documentation is in ftbitmap.h */
212 
213   FT_EXPORT_DEF( FT_Error )
FT_Bitmap_Embolden(FT_Library library,FT_Bitmap * bitmap,FT_Pos xStrength,FT_Pos yStrength)214   FT_Bitmap_Embolden( FT_Library  library,
215                       FT_Bitmap*  bitmap,
216                       FT_Pos      xStrength,
217                       FT_Pos      yStrength )
218   {
219     FT_Error        error;
220     unsigned char*  p;
221     FT_Int          i, x, y, pitch;
222     FT_Int          xstr, ystr;
223 
224 
225     if ( !library )
226       return FT_Err_Invalid_Library_Handle;
227 
228     if ( !bitmap || !bitmap->buffer )
229       return FT_Err_Invalid_Argument;
230 
231     if ( ( ( FT_PIX_ROUND( xStrength ) >> 6 ) > FT_INT_MAX ) ||
232          ( ( FT_PIX_ROUND( yStrength ) >> 6 ) > FT_INT_MAX ) )
233       return FT_Err_Invalid_Argument;
234 
235     xstr = (FT_Int)FT_PIX_ROUND( xStrength ) >> 6;
236     ystr = (FT_Int)FT_PIX_ROUND( yStrength ) >> 6;
237 
238     if ( xstr == 0 && ystr == 0 )
239       return FT_Err_Ok;
240     else if ( xstr < 0 || ystr < 0 )
241       return FT_Err_Invalid_Argument;
242 
243     switch ( bitmap->pixel_mode )
244     {
245     case FT_PIXEL_MODE_GRAY2:
246     case FT_PIXEL_MODE_GRAY4:
247       {
248         FT_Bitmap  tmp;
249         FT_Int     align;
250 
251 
252         if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY2 )
253           align = ( bitmap->width + xstr + 3 ) / 4;
254         else
255           align = ( bitmap->width + xstr + 1 ) / 2;
256 
257         FT_Bitmap_New( &tmp );
258 
259         error = FT_Bitmap_Convert( library, bitmap, &tmp, align );
260         if ( error )
261           return error;
262 
263         FT_Bitmap_Done( library, bitmap );
264         *bitmap = tmp;
265       }
266       break;
267 
268     case FT_PIXEL_MODE_MONO:
269       if ( xstr > 8 )
270         xstr = 8;
271       break;
272 
273     case FT_PIXEL_MODE_LCD:
274       xstr *= 3;
275       break;
276 
277     case FT_PIXEL_MODE_LCD_V:
278       ystr *= 3;
279       break;
280     }
281 
282     error = ft_bitmap_assure_buffer( library->memory, bitmap, xstr, ystr );
283     if ( error )
284       return error;
285 
286     pitch = bitmap->pitch;
287     if ( pitch > 0 )
288       p = bitmap->buffer + pitch * ystr;
289     else
290     {
291       pitch = -pitch;
292       p = bitmap->buffer + pitch * ( bitmap->rows - 1 );
293     }
294 
295     /* for each row */
296     for ( y = 0; y < bitmap->rows ; y++ )
297     {
298       /*
299        * Horizontally:
300        *
301        * From the last pixel on, make each pixel or'ed with the
302        * `xstr' pixels before it.
303        */
304       for ( x = pitch - 1; x >= 0; x-- )
305       {
306         unsigned char tmp;
307 
308 
309         tmp = p[x];
310         for ( i = 1; i <= xstr; i++ )
311         {
312           if ( bitmap->pixel_mode == FT_PIXEL_MODE_MONO )
313           {
314             p[x] |= tmp >> i;
315 
316             /* the maximum value of 8 for `xstr' comes from here */
317             if ( x > 0 )
318               p[x] |= p[x - 1] << ( 8 - i );
319 
320 #if 0
321             if ( p[x] == 0xff )
322               break;
323 #endif
324           }
325           else
326           {
327             if ( x - i >= 0 )
328             {
329               if ( p[x] + p[x - i] > bitmap->num_grays - 1 )
330               {
331                 p[x] = (unsigned char)(bitmap->num_grays - 1);
332                 break;
333               }
334               else
335               {
336                 p[x] = (unsigned char)(p[x] + p[x-i]);
337                 if ( p[x] == bitmap->num_grays - 1 )
338                   break;
339               }
340             }
341             else
342               break;
343           }
344         }
345       }
346 
347       /*
348        * Vertically:
349        *
350        * Make the above `ystr' rows or'ed with it.
351        */
352       for ( x = 1; x <= ystr; x++ )
353       {
354         unsigned char*  q;
355 
356 
357         q = p - bitmap->pitch * x;
358         for ( i = 0; i < pitch; i++ )
359           q[i] |= p[i];
360       }
361 
362       p += bitmap->pitch;
363     }
364 
365     bitmap->width += xstr;
366     bitmap->rows += ystr;
367 
368     return FT_Err_Ok;
369   }
370 
371 
372   /* documentation is in ftbitmap.h */
373 
374   FT_EXPORT_DEF( FT_Error )
FT_Bitmap_Convert(FT_Library library,const FT_Bitmap * source,FT_Bitmap * target,FT_Int alignment)375   FT_Bitmap_Convert( FT_Library        library,
376                      const FT_Bitmap  *source,
377                      FT_Bitmap        *target,
378                      FT_Int            alignment )
379   {
380     FT_Error   error = FT_Err_Ok;
381     FT_Memory  memory;
382 
383 
384     if ( !library )
385       return FT_Err_Invalid_Library_Handle;
386 
387     memory = library->memory;
388 
389     switch ( source->pixel_mode )
390     {
391     case FT_PIXEL_MODE_MONO:
392     case FT_PIXEL_MODE_GRAY:
393     case FT_PIXEL_MODE_GRAY2:
394     case FT_PIXEL_MODE_GRAY4:
395     case FT_PIXEL_MODE_LCD:
396     case FT_PIXEL_MODE_LCD_V:
397       {
398         FT_Int   pad;
399         FT_Long  old_size;
400 
401 
402         old_size = target->rows * target->pitch;
403         if ( old_size < 0 )
404           old_size = -old_size;
405 
406         target->pixel_mode = FT_PIXEL_MODE_GRAY;
407         target->rows       = source->rows;
408         target->width      = source->width;
409 
410         pad = 0;
411         if ( alignment > 0 )
412         {
413           pad = source->width % alignment;
414           if ( pad != 0 )
415             pad = alignment - pad;
416         }
417 
418         target->pitch = source->width + pad;
419 
420         if ( target->rows * target->pitch > old_size             &&
421              FT_QREALLOC( target->buffer,
422                           old_size, target->rows * target->pitch ) )
423           return error;
424       }
425       break;
426 
427     default:
428       error = FT_Err_Invalid_Argument;
429     }
430 
431     switch ( source->pixel_mode )
432     {
433     case FT_PIXEL_MODE_MONO:
434       {
435         FT_Byte*  s = source->buffer;
436         FT_Byte*  t = target->buffer;
437         FT_Int    i;
438 
439 
440         target->num_grays = 2;
441 
442         for ( i = source->rows; i > 0; i-- )
443         {
444           FT_Byte*  ss = s;
445           FT_Byte*  tt = t;
446           FT_Int    j;
447 
448 
449           /* get the full bytes */
450           for ( j = source->width >> 3; j > 0; j-- )
451           {
452             FT_Int  val = ss[0]; /* avoid a byte->int cast on each line */
453 
454 
455             tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7 );
456             tt[1] = (FT_Byte)( ( val & 0x40 ) >> 6 );
457             tt[2] = (FT_Byte)( ( val & 0x20 ) >> 5 );
458             tt[3] = (FT_Byte)( ( val & 0x10 ) >> 4 );
459             tt[4] = (FT_Byte)( ( val & 0x08 ) >> 3 );
460             tt[5] = (FT_Byte)( ( val & 0x04 ) >> 2 );
461             tt[6] = (FT_Byte)( ( val & 0x02 ) >> 1 );
462             tt[7] = (FT_Byte)(   val & 0x01 );
463 
464             tt += 8;
465             ss += 1;
466           }
467 
468           /* get remaining pixels (if any) */
469           j = source->width & 7;
470           if ( j > 0 )
471           {
472             FT_Int  val = *ss;
473 
474 
475             for ( ; j > 0; j-- )
476             {
477               tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7);
478               val <<= 1;
479               tt   += 1;
480             }
481           }
482 
483           s += source->pitch;
484           t += target->pitch;
485         }
486       }
487       break;
488 
489 
490     case FT_PIXEL_MODE_GRAY:
491     case FT_PIXEL_MODE_LCD:
492     case FT_PIXEL_MODE_LCD_V:
493       {
494         FT_Int    width   = source->width;
495         FT_Byte*  s       = source->buffer;
496         FT_Byte*  t       = target->buffer;
497         FT_Int    s_pitch = source->pitch;
498         FT_Int    t_pitch = target->pitch;
499         FT_Int    i;
500 
501 
502         target->num_grays = 256;
503 
504         for ( i = source->rows; i > 0; i-- )
505         {
506           FT_ARRAY_COPY( t, s, width );
507 
508           s += s_pitch;
509           t += t_pitch;
510         }
511       }
512       break;
513 
514 
515     case FT_PIXEL_MODE_GRAY2:
516       {
517         FT_Byte*  s = source->buffer;
518         FT_Byte*  t = target->buffer;
519         FT_Int    i;
520 
521 
522         target->num_grays = 4;
523 
524         for ( i = source->rows; i > 0; i-- )
525         {
526           FT_Byte*  ss = s;
527           FT_Byte*  tt = t;
528           FT_Int    j;
529 
530 
531           /* get the full bytes */
532           for ( j = source->width >> 2; j > 0; j-- )
533           {
534             FT_Int  val = ss[0];
535 
536 
537             tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 );
538             tt[1] = (FT_Byte)( ( val & 0x30 ) >> 4 );
539             tt[2] = (FT_Byte)( ( val & 0x0C ) >> 2 );
540             tt[3] = (FT_Byte)( ( val & 0x03 ) );
541 
542             ss += 1;
543             tt += 4;
544           }
545 
546           j = source->width & 3;
547           if ( j > 0 )
548           {
549             FT_Int  val = ss[0];
550 
551 
552             for ( ; j > 0; j-- )
553             {
554               tt[0]  = (FT_Byte)( ( val & 0xC0 ) >> 6 );
555               val  <<= 2;
556               tt    += 1;
557             }
558           }
559 
560           s += source->pitch;
561           t += target->pitch;
562         }
563       }
564       break;
565 
566 
567     case FT_PIXEL_MODE_GRAY4:
568       {
569         FT_Byte*  s = source->buffer;
570         FT_Byte*  t = target->buffer;
571         FT_Int    i;
572 
573 
574         target->num_grays = 16;
575 
576         for ( i = source->rows; i > 0; i-- )
577         {
578           FT_Byte*  ss = s;
579           FT_Byte*  tt = t;
580           FT_Int    j;
581 
582 
583           /* get the full bytes */
584           for ( j = source->width >> 1; j > 0; j-- )
585           {
586             FT_Int  val = ss[0];
587 
588 
589             tt[0] = (FT_Byte)( ( val & 0xF0 ) >> 4 );
590             tt[1] = (FT_Byte)( ( val & 0x0F ) );
591 
592             ss += 1;
593             tt += 2;
594           }
595 
596           if ( source->width & 1 )
597             tt[0] = (FT_Byte)( ( ss[0] & 0xF0 ) >> 4 );
598 
599           s += source->pitch;
600           t += target->pitch;
601         }
602       }
603       break;
604 
605 
606     default:
607       ;
608     }
609 
610     return error;
611   }
612 
613 
614   /* documentation is in ftbitmap.h */
615 
616   FT_EXPORT_DEF( FT_Error )
FT_GlyphSlot_Own_Bitmap(FT_GlyphSlot slot)617   FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot  slot )
618   {
619     if ( slot && slot->format == FT_GLYPH_FORMAT_BITMAP   &&
620          !( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) )
621     {
622       FT_Bitmap  bitmap;
623       FT_Error   error;
624 
625 
626       FT_Bitmap_New( &bitmap );
627       error = FT_Bitmap_Copy( slot->library, &slot->bitmap, &bitmap );
628       if ( error )
629         return error;
630 
631       slot->bitmap = bitmap;
632       slot->internal->flags |= FT_GLYPH_OWN_BITMAP;
633     }
634 
635     return FT_Err_Ok;
636   }
637 
638 
639   /* documentation is in ftbitmap.h */
640 
641   FT_EXPORT_DEF( FT_Error )
FT_Bitmap_Done(FT_Library library,FT_Bitmap * bitmap)642   FT_Bitmap_Done( FT_Library  library,
643                   FT_Bitmap  *bitmap )
644   {
645     FT_Memory  memory;
646 
647 
648     if ( !library )
649       return FT_Err_Invalid_Library_Handle;
650 
651     if ( !bitmap )
652       return FT_Err_Invalid_Argument;
653 
654     memory = library->memory;
655 
656     FT_FREE( bitmap->buffer );
657     *bitmap = null_bitmap;
658 
659     return FT_Err_Ok;
660   }
661 
662 
663 /* END */
664