18 font.c - implements font handling functions for t1 and truetype fonts
25 fontnum = i_t1_new(path_to_pfb, path_to_afm);
26 i_t1_bbox(fontnum, points, "foo", 3, int cords[6]);
27 rc = i_t1_destroy(fontnum);
31 handle = i_tt_new(path_to_ttf);
32 rc = i_tt_bbox(handle, points, "foo", 3, int cords[6]);
39 font.c implements font creation, rendering, bounding box functions and
42 =head1 FUNCTION REFERENCE
44 Some of these functions are internal.
63 Initialize font rendering libraries if they are avaliable.
70 mm_log((1,"Initializing fonts\n"));
80 return(1); /* FIXME: Always true - check the return values of the init_t1 and init_tt functions */
93 Initializes the t1lib font rendering engine.
100 mm_log((1,"init_t1()\n"));
101 if ((T1_InitLib(LOGFILE|IGNORE_CONFIGFILE|IGNORE_FONTDATABASE) == NULL)){
102 mm_log((1,"Initialization of t1lib failed\n"));
105 T1_SetLogLevel(T1LOG_DEBUG);
106 i_t1_set_aa(1); /* Default Antialias value */
114 Shuts the t1lib font rendering engine down.
116 This it seems that this function is never used.
128 =item i_t1_new(pfb, afm)
130 Loads the fonts with the given filenames, returns its font id
132 pfb - path to pfb file for font
133 afm - path to afm file for font
139 i_t1_new(char *pfb,char *afm) {
141 mm_log((1,"i_t1_new(pfb %s,afm %s)\n",pfb,(afm?afm:"NULL")));
142 font_id = T1_AddFont(pfb);
144 mm_log((1,"i_t1_new: Failed to load pfb file '%s' - return code %d.\n",pfb,font_id));
149 mm_log((1,"i_t1_new: requesting afm file '%s'.\n",afm));
150 if (T1_SetAfmFileName(font_id,afm)<0) mm_log((1,"i_t1_new: afm loading of '%s' failed.\n",afm));
156 =item i_t1_destroy(font_id)
158 Frees resources for a t1 font with given font id.
160 font_id - number of the font to free
166 i_t1_destroy(int font_id) {
167 mm_log((1,"i_t1_destroy(font_id %d)\n",font_id));
168 return T1_DeleteFont(font_id);
173 =item i_t1_set_aa(st)
175 Sets the antialiasing level of the t1 library.
177 st - 0 = NONE, 1 = LOW, 2 = HIGH.
183 i_t1_set_aa(int st) {
185 unsigned long cst[17];
188 T1_AASetBitsPerPixel( 8 );
189 T1_AASetLevel( T1_AA_NONE );
190 T1_AANSetGrayValues( 0, 255 );
191 mm_log((1,"setting T1 antialias to none\n"));
194 T1_AASetBitsPerPixel( 8 );
195 T1_AASetLevel( T1_AA_LOW );
196 T1_AASetGrayValues( 0,65,127,191,255 );
197 mm_log((1,"setting T1 antialias to low\n"));
200 T1_AASetBitsPerPixel(8);
201 T1_AASetLevel(T1_AA_HIGH);
202 for(i=0;i<17;i++) cst[i]=(i*255)/16;
203 T1_AAHSetGrayValues( cst );
204 mm_log((1,"setting T1 antialias to high\n"));
210 =item i_t1_cp(im, xb, yb, channel, fontnum, points, str, len, align)
212 Interface to text rendering into a single channel in an image
214 im pointer to image structure
215 xb x coordinate of start of string
216 yb y coordinate of start of string ( see align )
217 channel - destination channel
218 fontnum - t1 library font id
219 points - number of points in fontheight
220 str - string to render
222 align - (0 - top of font glyph | 1 - baseline )
228 i_t1_cp(i_img *im,int xb,int yb,int channel,int fontnum,float points,char* str,int len,int align) {
233 unsigned int ch_mask_store;
235 if (im == NULL) { mm_log((1,"i_t1_cp: Null image in input\n")); return(0); }
237 glyph=T1_AASetString( fontnum, str, len, 0, T1_KERNING, points, NULL);
239 mm_log((1,"metrics: ascent: %d descent: %d\n",glyph->metrics.ascent,glyph->metrics.descent));
240 mm_log((1," leftSideBearing: %d rightSideBearing: %d\n",glyph->metrics.leftSideBearing,glyph->metrics.rightSideBearing));
241 mm_log((1," advanceX: %d advanceY: %d\n",glyph->metrics.advanceX,glyph->metrics.advanceY));
242 mm_log((1,"bpp: %d\n",glyph->bpp));
244 xsize=glyph->metrics.rightSideBearing-glyph->metrics.leftSideBearing;
245 ysize=glyph->metrics.ascent-glyph->metrics.descent;
247 mm_log((1,"width: %d height: %d\n",xsize,ysize));
249 ch_mask_store=im->ch_mask;
250 im->ch_mask=1<<channel;
252 if (align==1) { xb+=glyph->metrics.leftSideBearing; yb-=glyph->metrics.ascent; }
254 for(y=0;y<ysize;y++) for(x=0;x<xsize;x++) {
255 val.channel[channel]=glyph->bits[y*xsize+x];
256 i_ppix(im,x+xb,y+yb,&val);
259 im->ch_mask=ch_mask_store;
265 =item i_t1_bbox(handle, fontnum, points, str, len, cords)
267 function to get a strings bounding box given the font id and sizes
269 handle - pointer to font handle
270 fontnum - t1 library font id
271 points - number of points in fontheight
272 str - string to measure
274 cords - the bounding box (modified in place)
280 i_t1_bbox(int fontnum,float points,char *str,int len,int cords[6]) {
284 mm_log((1,"i_t1_bbox(fontnum %d,points %.2f,str '%.*s', len %d)\n",fontnum,points,len,str,len));
285 T1_LoadFont(fontnum); /* FIXME: Here a return code is ignored - haw haw haw */
286 bbox = T1_GetStringBBox(fontnum,str,len,0,T1_KERNING);
287 gbbox = T1_GetFontBBox(fontnum);
289 mm_log((1,"bbox: (%d,%d,%d,%d)\n",
290 (int)(bbox.llx*points/1000),
291 (int)(gbbox.lly*points/1000),
292 (int)(bbox.urx*points/1000),
293 (int)(gbbox.ury*points/1000),
294 (int)(bbox.lly*points/1000),
295 (int)(bbox.ury*points/1000) ));
298 cords[0]=((float)bbox.llx*points)/1000;
299 cords[2]=((float)bbox.urx*points)/1000;
301 cords[1]=((float)gbbox.lly*points)/1000;
302 cords[3]=((float)gbbox.ury*points)/1000;
304 cords[4]=((float)bbox.lly*points)/1000;
305 cords[5]=((float)bbox.ury*points)/1000;
310 =item i_t1_text(im, xb, yb, cl, fontnum, points, str, len, align)
312 Interface to text rendering in a single color onto an image
314 im - pointer to image structure
315 xb - x coordinate of start of string
316 yb - y coordinate of start of string ( see align )
317 cl - color to draw the text in
318 fontnum - t1 library font id
319 points - number of points in fontheight
320 str - char pointer to string to render
322 align - (0 - top of font glyph | 1 - baseline )
328 i_t1_text(i_img *im,int xb,int yb,i_color *cl,int fontnum,float points,char* str,int len,int align) {
330 int xsize,ysize,x,y,ch;
334 if (im == NULL) { mm_log((1,"i_t1_cp: Null image in input\n")); return(0); }
336 glyph=T1_AASetString( fontnum, str, len, 0, T1_KERNING, points, NULL);
338 mm_log((1,"metrics: ascent: %d descent: %d\n",glyph->metrics.ascent,glyph->metrics.descent));
339 mm_log((1," leftSideBearing: %d rightSideBearing: %d\n",glyph->metrics.leftSideBearing,glyph->metrics.rightSideBearing));
340 mm_log((1," advanceX: %d advanceY: %d\n",glyph->metrics.advanceX,glyph->metrics.advanceY));
341 mm_log((1,"bpp: %d\n",glyph->bpp));
343 xsize=glyph->metrics.rightSideBearing-glyph->metrics.leftSideBearing;
344 ysize=glyph->metrics.ascent-glyph->metrics.descent;
346 mm_log((1,"width: %d height: %d\n",xsize,ysize));
348 if (align==1) { xb+=glyph->metrics.leftSideBearing; yb-=glyph->metrics.ascent; }
350 for(y=0;y<ysize;y++) for(x=0;x<xsize;x++) {
351 c=glyph->bits[y*xsize+x];
353 i_gpix(im,x+xb,y+yb,&val);
354 for(ch=0;ch<im->channels;ch++) val.channel[ch]=(c*cl->channel[ch]+i*val.channel[ch])/255;
355 i_ppix(im,x+xb,y+yb,&val);
361 #endif /* HAVE_LIBT1 */
372 /* Truetype font support */
379 #define USTRCT(x) ((x).z)
380 #define TT_VALID( handle ) ( ( handle ).z != NULL )
385 static int i_tt_get_instance( TT_Fonthandle *handle, int points, int smooth );
386 static void i_tt_init_raster_map( TT_Raster_Map* bit, int width, int height, int smooth );
387 static void i_tt_done_raster_map( TT_Raster_Map *bit );
388 static void i_tt_clear_raster_map( TT_Raster_Map* bit );
389 static void i_tt_blit_or( TT_Raster_Map *dst, TT_Raster_Map *src,int x_off, int y_off );
390 static int i_tt_get_glyph( TT_Fonthandle *handle, int inst, unsigned char j );
391 static void i_tt_render_glyph( TT_Glyph glyph, TT_Glyph_Metrics* gmetrics, TT_Raster_Map *bit, TT_Raster_Map *small_bit, int x_off, int y_off, int smooth );
392 static void i_tt_render_all_glyphs( TT_Fonthandle *handle, int inst, TT_Raster_Map *bit, TT_Raster_Map *small_bit, int cords[6], char* txt, int len, int smooth );
393 static void i_tt_dump_raster_map2( i_img* im, TT_Raster_Map* bit, int xb, int yb, i_color *cl, int smooth );
394 static void i_tt_dump_raster_map_channel( i_img* im, TT_Raster_Map* bit, int xb, int yb, int channel, int smooth );
395 static int i_tt_rasterize( TT_Fonthandle *handle, TT_Raster_Map *bit, int cords[6], float points, char* txt, int len, int smooth );
396 static undef_int i_tt_bbox_inst( TT_Fonthandle *handle, int inst ,const char *txt, int len, int cords[6] );
399 /* static globals needed */
401 static TT_Engine engine;
402 static int LTT_dpi = 72; /* FIXME: this ought to be a part of the call interface */
403 static int LTT_hinted = 1; /* FIXME: this too */
414 Initializes the freetype font rendering engine
422 mm_log((1,"init_tt()\n"));
423 error = TT_Init_FreeType( &engine );
425 mm_log((1,"Initialization of freetype failed, code = 0x%x\n",error));
433 =item i_tt_get_instance(handle, points, smooth)
435 Finds a points+smooth instance or if one doesn't exist in the cache
436 allocates room and returns its cache entry
438 fontname - path to the font to load
439 handle - handle to the font.
440 points - points of the requested font
441 smooth - boolean (True: antialias on, False: antialias is off)
448 i_tt_get_instance( TT_Fonthandle *handle, int points, int smooth ) {
452 mm_log((1,"i_tt_get_instance(handle 0x%X, points %d, smooth %d)\n",handle,points,smooth));
454 if (smooth == -1) { /* Smooth doesn't matter for this search */
455 for(i=0;i<TT_CHC;i++) if (handle->instanceh[i].ptsize==points) {
456 mm_log((1,"i_tt_get_instance: in cache - (non selective smoothing search) returning %d\n",i));
459 smooth=1; /* We will be adding a font - add it as smooth then */
460 } else { /* Smooth doesn't matter for this search */
461 for(i=0;i<TT_CHC;i++) if (handle->instanceh[i].ptsize==points && handle->instanceh[i].smooth==smooth) {
462 mm_log((1,"i_tt_get_instance: in cache returning %d\n",i));
467 /* Found the instance in the cache - return the cache index */
469 for(idx=0;idx<TT_CHC;idx++) if (!(handle->instanceh[idx].order)) break; /* find the lru item */
471 mm_log((1,"i_tt_get_instance: lru item is %d\n",idx));
472 mm_log((1,"i_tt_get_instance: lru pointer 0x%X\n",USTRCT(handle->instanceh[idx].instance) ));
474 if ( USTRCT(handle->instanceh[idx].instance) ) {
475 mm_log((1,"i_tt_get_instance: freeing lru item from cache %d\n",idx));
476 TT_Done_Instance( handle->instanceh[idx].instance ); /* Free instance if needed */
479 /* create and initialize instance */
480 /* FIXME: probably a memory leak on fail */
482 (void) (( error = TT_New_Instance( handle->face, &handle->instanceh[idx].instance ) ) ||
483 ( error = TT_Set_Instance_Resolutions( handle->instanceh[idx].instance, LTT_dpi, LTT_dpi ) ) ||
484 ( error = TT_Set_Instance_CharSize( handle->instanceh[idx].instance, points*64 ) ) );
487 mm_log((1, "Could not create and initialize instance: error 0x%x.\n",error ));
491 /* Now that the instance should the inplace we need to lower all of the
492 ru counts and put `this' one with the highest entry */
494 for(i=0;i<TT_CHC;i++) handle->instanceh[i].order--;
496 handle->instanceh[idx].order=TT_CHC-1;
497 handle->instanceh[idx].ptsize=points;
498 handle->instanceh[idx].smooth=smooth;
499 TT_Get_Instance_Metrics( handle->instanceh[idx].instance, &(handle->instanceh[idx].imetrics) );
501 /* Zero the memory for the glyph storage so they are not thought as cached if they haven't been cached
502 since this new font was loaded */
504 for(i=0;i<256;i++) USTRCT(handle->instanceh[idx].glyphs[i])=NULL;
511 =item i_tt_new(fontname)
513 Creates a new font handle object, finds a character map and initialise the
514 the font handle's cache
516 fontname - path to the font to load
522 i_tt_new(char *fontname) {
524 TT_Fonthandle *handle;
526 unsigned short platform,encoding;
528 mm_log((1,"i_tt_new(fontname '%s')\n",fontname));
530 /* allocate memory for the structure */
532 handle=mymalloc( sizeof(TT_Fonthandle) );
534 /* load the typeface */
535 error = TT_Open_Face( engine, fontname, &handle->face );
537 if ( error == TT_Err_Could_Not_Open_File ) mm_log((1, "Could not find/open %s.\n", fontname ))
538 else mm_log((1, "Error while opening %s, error code = 0x%x.\n",fontname, error ));
542 TT_Get_Face_Properties( handle->face, &(handle->properties) );
543 /* First, look for a Unicode charmap */
545 n = handle->properties.num_CharMaps;
546 USTRCT( handle->char_map )=NULL; /* Invalidate character map */
548 for ( i = 0; i < n; i++ ) {
549 TT_Get_CharMap_ID( handle->face, i, &platform, &encoding );
550 if ( (platform == 3 && encoding == 1 ) || (platform == 0 && encoding == 0 ) ) {
551 TT_Get_CharMap( handle->face, i, &(handle->char_map) );
556 /* Zero the pointsizes - and ordering */
558 for(i=0;i<TT_CHC;i++) {
559 USTRCT(handle->instanceh[i].instance)=NULL;
560 handle->instanceh[i].order=i;
561 handle->instanceh[i].ptsize=0;
562 handle->instanceh[i].smooth=-1;
565 mm_log((1,"i_tt_new <- 0x%X\n",handle));
572 * raster map management
576 =item i_tt_init_raster_map(bit, width, height, smooth)
578 Allocates internal memory for the bitmap as needed by the parameters (internal)
580 bit - bitmap to allocate into
581 width - width of the bitmap
582 height - height of the bitmap
583 smooth - boolean (True: antialias on, False: antialias is off)
590 i_tt_init_raster_map( TT_Raster_Map* bit, int width, int height, int smooth ) {
592 mm_log((1,"i_tt_init_raster_map( bit 08x%08X, width %d, height %d, smooth %d)\n", bit, width, height, smooth));
595 bit->width = ( width + 3 ) & -4;
596 bit->flow = TT_Flow_Down;
599 bit->cols = bit->width;
600 bit->size = bit->rows * bit->width;
602 bit->cols = ( bit->width + 7 ) / 8; /* convert to # of bytes */
603 bit->size = bit->rows * bit->cols; /* number of bytes in buffer */
606 mm_log((1,"i_tt_init_raster_map: bit->width %d, bit->cols %d, bit->rows %d, bit->size %d)\n", bit->width, bit->cols, bit->rows, bit->size ));
608 bit->bitmap = (void *) mymalloc( bit->size );
609 if ( !bit->bitmap ) m_fatal(0,"Not enough memory to allocate bitmap (%d)!\n",bit->size );
614 =item i_tt_clear_raster_map(bit)
616 Frees the bitmap data and sets pointer to NULL (internal)
625 i_tt_done_raster_map( TT_Raster_Map *bit ) {
626 myfree( bit->bitmap );
632 =item i_tt_clear_raster_map(bit)
634 Clears the specified bitmap (internal)
644 i_tt_clear_raster_map( TT_Raster_Map* bit ) {
645 memset( bit->bitmap, 0, bit->size );
650 =item i_tt_blit_or(dst, src, x_off, y_off)
652 function that blits one raster map into another (internal)
654 dst - destination bitmap
656 x_off - x offset into the destination bitmap
657 y_off - y offset into the destination bitmap
664 i_tt_blit_or( TT_Raster_Map *dst, TT_Raster_Map *src,int x_off, int y_off ) {
669 x1 = x_off < 0 ? -x_off : 0;
670 y1 = y_off < 0 ? -y_off : 0;
672 x2 = (int)dst->cols - x_off;
673 if ( x2 > src->cols ) x2 = src->cols;
675 y2 = (int)dst->rows - y_off;
676 if ( y2 > src->rows ) y2 = src->rows;
678 if ( x1 >= x2 ) return;
680 /* do the real work now */
682 for ( y = y1; y < y2; ++y ) {
683 s = ( (char*)src->bitmap ) + y * src->cols + x1;
684 d = ( (char*)dst->bitmap ) + ( y + y_off ) * dst->cols + x1 + x_off;
686 for ( x = x1; x < x2; ++x ) *d++ |= *s++;
692 =item i_tt_get_glyph(handle, inst, j)
694 Function to see if a glyph exists and if so cache it (internal)
696 handle - pointer to font handle
698 j - charcode of glyph
705 i_tt_get_glyph( TT_Fonthandle *handle, int inst, unsigned char j) { /* FIXME: Check if unsigned char is enough */
706 unsigned short load_flags, code;
709 mm_log((1, "i_tt_get_glyph(handle 0x%X, inst %d, j %d (%c))\n",handle,inst,j,j));
710 mm_log((1, "handle->instanceh[inst].glyphs[j]=0x%08X\n",handle->instanceh[inst].glyphs[j] ));
712 if ( TT_VALID(handle->instanceh[inst].glyphs[j]) ) {
713 mm_log((1,"i_tt_get_glyph: %d in cache\n",j));
717 /* Ok - it wasn't cached - try to get it in */
718 load_flags = TTLOAD_SCALE_GLYPH;
719 if ( LTT_hinted ) load_flags |= TTLOAD_HINT_GLYPH;
721 if ( !TT_VALID(handle->char_map) ) {
722 code = (j - ' ' + 1) < 0 ? 0 : (j - ' ' + 1);
723 if ( code >= handle->properties.num_Glyphs ) code = 0;
724 } else code = TT_Char_Index( handle->char_map, j );
726 if ( (error = TT_New_Glyph( handle->face, &handle->instanceh[inst].glyphs[j])) )
727 mm_log((1, "Cannot allocate and load glyph: error 0x%x.\n", error ));
728 if ( (error = TT_Load_Glyph( handle->instanceh[inst].instance, handle->instanceh[inst].glyphs[j], code, load_flags)) )
729 mm_log((1, "Cannot allocate and load glyph: error 0x%x.\n", error ));
731 /* At this point the glyph should be allocated and loaded */
732 /* Next get the glyph metrics */
734 error = TT_Get_Glyph_Metrics( handle->instanceh[inst].glyphs[j], &handle->instanceh[inst].gmetrics[j] );
735 mm_log((1, "TT_Get_Glyph_Metrics: error 0x%x.\n", error ));
741 =item i_tt_destroy(handle)
743 Clears the data taken by a font including all cached data such as
746 handle - pointer to font handle
752 i_tt_destroy( TT_Fonthandle *handle) {
753 TT_Close_Face( handle->face );
755 /* FIXME: Should these be freed automatically by the library?
757 TT_Done_Instance( instance );
759 i_tt_done_glyphs( void ) {
762 if ( !glyphs ) return;
764 for ( i = 0; i < 256; ++i ) TT_Done_Glyph( glyphs[i] );
774 * FreeType Rendering functions
779 =item i_tt_render_glyph(handle, gmetrics, bit, smallbit, x_off, y_off, smooth)
781 Renders a single glyph into the bit rastermap (internal)
783 handle - pointer to font handle
784 gmetrics - the metrics for the glyph to be rendered
785 bit - large bitmap that is the destination for the text
786 smallbit - small bitmap that is used only if smooth is true
787 x_off - x offset of glyph
788 y_off - y offset of glyph
789 smooth - boolean (True: antialias on, False: antialias is off)
796 i_tt_render_glyph( TT_Glyph glyph, TT_Glyph_Metrics* gmetrics, TT_Raster_Map *bit, TT_Raster_Map *small_bit, int x_off, int y_off, int smooth ) {
798 mm_log((1,"i_tt_render_glyph(glyph 0x0%X, gmetrics 0x0%X, bit 0x%X, small_bit 0x%X, x_off %d, y_off %d, smooth %d)\n",
799 USTRCT(glyph), gmetrics, bit, small_bit, x_off,y_off,smooth));
801 if ( !smooth ) TT_Get_Glyph_Bitmap( glyph, bit, x_off * 64, y_off * 64);
803 TT_F26Dot6 xmin, ymin, xmax, ymax;
805 xmin = gmetrics->bbox.xMin & -64;
806 ymin = gmetrics->bbox.yMin & -64;
807 xmax = (gmetrics->bbox.xMax + 63) & -64;
808 ymax = (gmetrics->bbox.yMax + 63) & -64;
810 i_tt_clear_raster_map( small_bit );
811 TT_Get_Glyph_Pixmap( glyph, small_bit, -xmin, -ymin );
812 i_tt_blit_or( bit, small_bit, xmin/64 + x_off, -ymin/64 - y_off );
818 =item i_tt_render_all_glyphs(handle, inst, bit, small_bit, cords, txt, len, smooth)
820 calls i_tt_render_glyph to render each glyph into the bit rastermap (internal)
822 handle - pointer to font handle
824 bit - large bitmap that is the destination for the text
825 smallbit - small bitmap that is used only if smooth is true
826 txt - string to render
827 len - length of the string to render
828 smooth - boolean (True: antialias on, False: antialias is off)
835 i_tt_render_all_glyphs( TT_Fonthandle *handle, int inst, TT_Raster_Map *bit, TT_Raster_Map *small_bit, int cords[6], char* txt, int len, int smooth ) {
840 mm_log((1,"i_tt_render_all_glyphs( handle 0x%X, inst %d, bit 0x%X, small_bit 0x%X, txt '%.*s', len %d, smooth %d)\n",
841 handle, inst, bit, small_bit, len, txt, len, smooth));
844 y=-( handle->properties.horizontal->Descender * handle->instanceh[inst].imetrics.y_ppem )/(handle->properties.header->Units_Per_EM);
847 x=cords[0]; /* FIXME: If you font is antialiased this should be expanded by one to allow for aa expansion and the allocation too - do before passing here */
850 for ( i = 0; i < len; i++ ) {
852 if ( !i_tt_get_glyph(handle,inst,j) ) continue;
853 i_tt_render_glyph( handle->instanceh[inst].glyphs[j], &handle->instanceh[inst].gmetrics[j], bit, small_bit, x, y, smooth );
854 x += handle->instanceh[inst].gmetrics[j].advance / 64;
860 * Functions to render rasters (single channel images) onto images
864 =item i_tt_dump_raster_map2(im, bit, xb, yb, cl, smooth)
866 Function to dump a raster onto an image in color used by i_tt_text() (internal).
868 im - image to dump raster on
869 bit - bitmap that contains the text to be dumped to im
870 xb, yb - coordinates, left edge and baseline
871 cl - color to use for text
872 smooth - boolean (True: antialias on, False: antialias is off)
879 i_tt_dump_raster_map2( i_img* im, TT_Raster_Map* bit, int xb, int yb, i_color *cl, int smooth ) {
883 mm_log((1,"i_tt_dump_raster_map2(im 0x%x, bit 0x%X, xb %d, yb %d, cl 0x%X)\n",im,bit,xb,yb,cl));
885 bmap = (char *)bit->bitmap;
889 for(y=0;y<bit->rows;y++) for(x=0;x<bit->width;x++) {
890 c=(255*bmap[y*(bit->cols)+x])/4;
892 i_gpix(im,x+xb,y+yb,&val);
893 for(ch=0;ch<im->channels;ch++) val.channel[ch]=(c*cl->channel[ch]+i*val.channel[ch])/255;
894 i_ppix(im,x+xb,y+yb,&val);
899 for(y=0;y<bit->rows;y++) for(x=0;x<bit->width;x++) {
900 c=( bmap[y*bit->cols+x/8] & (128>>(x%8)) ) ? 255 : 0;
902 i_gpix(im,x+xb,y+yb,&val);
903 for(ch=0;ch<im->channels;ch++) val.channel[ch]=(c*cl->channel[ch]+i*val.channel[ch])/255;
904 i_ppix(im,x+xb,y+yb,&val);
912 =item i_tt_dump_raster_map_channel(im, bit, xb, yb, channel, smooth)
914 Function to dump a raster onto a single channel image in color (internal)
916 im - image to dump raster on
917 bit - bitmap that contains the text to be dumped to im
918 xb, yb - coordinates, left edge and baseline
919 channel - channel to copy to
920 smooth - boolean (True: antialias on, False: antialias is off)
927 i_tt_dump_raster_map_channel( i_img* im, TT_Raster_Map* bit, int xb, int yb, int channel, int smooth ) {
932 mm_log((1,"i_tt_dump_raster_channel(im 0x%x, bit 0x%X, xb %d, yb %d, channel %d)\n",im,bit,xb,yb,channel));
934 bmap = (char *)bit->bitmap;
937 for(y=0;y<bit->rows;y++) for(x=0;x<bit->width;x++) {
938 c=(255*bmap[y*(bit->cols)+x])/4;
939 i_gpix(im,x+xb,y+yb,&val);
940 val.channel[channel]=c;
941 i_ppix(im,x+xb,y+yb,&val);
944 for(y=0;y<bit->rows;y++) for(x=0;x<bit->width;x++) {
945 c=( bmap[y*bit->cols+x/8] & (128>>(x%8)) ) ? 255 : 0;
946 i_gpix(im,x+xb,y+yb,&val);
947 val.channel[channel]=c;
948 i_ppix(im,x+xb,y+yb,&val);
955 =item i_tt_rasterize(handle, bit, cords, points, txt, len, smooth)
957 interface for generating single channel raster of text (internal)
959 handle - pointer to font handle
960 bit - the bitmap that is allocated, rendered into and NOT freed
961 cords - the bounding box (modified in place)
962 points - font size to use
963 txt - string to render
964 len - length of the string to render
965 smooth - boolean (True: antialias on, False: antialias is off)
972 i_tt_rasterize( TT_Fonthandle *handle, TT_Raster_Map *bit, int cords[6], float points, char* txt, int len, int smooth ) {
975 TT_Raster_Map small_bit;
977 /* find or install an instance */
978 if ( (inst=i_tt_get_instance(handle,points,smooth)) < 0) {
979 mm_log((1,"i_tt_rasterize: get instance failed\n"));
983 /* calculate bounding box */
984 i_tt_bbox_inst( handle, inst, txt, len, cords );
986 width = cords[2]-cords[0];
987 height = cords[3]-cords[1];
989 mm_log((1,"i_tt_rasterize: width=%d, height=%d\n",width, height ));
991 i_tt_init_raster_map ( bit, width, height, smooth );
992 i_tt_clear_raster_map( bit );
993 if ( smooth ) i_tt_init_raster_map( &small_bit, handle->instanceh[inst].imetrics.x_ppem + 32, height, smooth );
995 i_tt_render_all_glyphs( handle, inst, bit, &small_bit, cords, txt, len, smooth );
997 /* ascent = ( handle->properties.horizontal->Ascender * handle->instanceh[inst].imetrics.y_ppem ) / handle->properties.header->Units_Per_EM; */
999 if ( smooth ) i_tt_done_raster_map( &small_bit );
1006 * Exported text rendering interfaces
1011 =item i_tt_cp(handle, im, xb, yb, channel, points, txt, len, smooth)
1013 Interface to text rendering into a single channel in an image
1015 handle - pointer to font handle
1016 im - image to render text on to
1017 xb, yb - coordinates, left edge and baseline
1018 channel - channel to render into
1019 points - font size to use
1020 txt - string to render
1021 len - length of the string to render
1022 smooth - boolean (True: antialias on, False: antialias is off)
1028 i_tt_cp( TT_Fonthandle *handle, i_img *im, int xb, int yb, int channel, float points, char* txt, int len, int smooth ) {
1031 int ascent, st_offset;
1034 if (! i_tt_rasterize( handle, &bit, cords, points, txt, len, smooth ) ) return 0;
1039 i_tt_dump_raster_map_channel( im, &bit, xb-st_offset , yb-ascent, channel, smooth );
1040 i_tt_done_raster_map( &bit );
1047 =item i_tt_text(handle, im, xb, yb, cl, points, txt, len, smooth)
1049 Interface to text rendering in a single color onto an image
1051 handle - pointer to font handle
1052 im - image to render text on to
1053 xb, yb - coordinates, left edge and baseline
1054 cl - color to use for text
1055 points - font size to use
1056 txt - string to render
1057 len - length of the string to render
1058 smooth - boolean (True: antialias on, False: antialias is off)
1064 i_tt_text( TT_Fonthandle *handle, i_img *im, int xb, int yb, i_color *cl, float points, char* txt, int len, int smooth) {
1066 int ascent, st_offset;
1069 if (! i_tt_rasterize( handle, &bit, cords, points, txt, len, smooth ) ) return 0;
1074 i_tt_dump_raster_map2( im, &bit, xb-st_offset, yb-ascent, cl, smooth );
1075 i_tt_done_raster_map( &bit );
1082 =item i_tt_bbox_inst(handle, inst, txt, len, cords)
1084 Function to get texts bounding boxes given the instance of the font (internal)
1086 handle - pointer to font handle
1087 inst - font instance
1088 txt - string to measure
1089 len - length of the string to render
1090 cords - the bounding box (modified in place)
1097 i_tt_bbox_inst( TT_Fonthandle *handle, int inst ,const char *txt, int len, int cords[6] ) {
1098 int i, upm, ascent, descent, gascent, gdescent, width, casc, cdesc, first, start;
1100 unsigned char *ustr;
1101 ustr=(unsigned char*)txt;
1103 mm_log((1,"i_tt_box_inst(handle 0x%X,inst %d,txt '%.*s', len %d)\n",handle,inst,len,txt,len));
1105 upm = handle->properties.header->Units_Per_EM;
1106 gascent = ( handle->properties.horizontal->Ascender * handle->instanceh[inst].imetrics.y_ppem ) / upm;
1107 gdescent = ( handle->properties.horizontal->Descender * handle->instanceh[inst].imetrics.y_ppem ) / upm;
1112 mm_log((1, "i_tt_box_inst: glyph='%c' ascent=%d descent=%d\n", j, ascent, descent));
1115 for ( i = 0; i < len; ++i ) {
1117 if ( i_tt_get_glyph(handle,inst,j) ) {
1118 width += handle->instanceh[inst].gmetrics[j].advance / 64;
1119 casc = handle->instanceh[inst].gmetrics[j].bbox.yMax / 64;
1120 cdesc = handle->instanceh[inst].gmetrics[j].bbox.yMin / 64;
1122 mm_log((1, "i_tt_box_inst: glyph='%c' casc=%d cdesc=%d\n", j, casc, cdesc));
1125 start = handle->instanceh[inst].gmetrics[j].bbox.xMin / 64;
1126 ascent = handle->instanceh[inst].gmetrics[j].bbox.yMax / 64;
1127 descent = handle->instanceh[inst].gmetrics[j].bbox.yMin / 64;
1131 ascent = (ascent > casc ? ascent : casc );
1132 descent = (descent < cdesc ? descent : cdesc);
1138 cords[2]=width+start;
1147 =item i_tt_bbox(handle, points, txt, len, cords)
1149 Interface to get a strings bounding box
1151 handle - pointer to font handle
1152 points - font size to use
1153 txt - string to render
1154 len - length of the string to render
1155 cords - the bounding box (modified in place)
1161 i_tt_bbox( TT_Fonthandle *handle, float points,char *txt,int len,int cords[6]) {
1164 mm_log((1,"i_tt_box(handle 0x%X,points %f,txt '%.*s', len %d)\n",handle,points,len,txt,len));
1166 if ( (inst=i_tt_get_instance(handle,points,-1)) < 0) {
1167 mm_log((1,"i_tt_text: get instance failed\n"));
1171 return i_tt_bbox_inst(handle, inst, txt, len, cords);
1176 #endif /* HAVE_LIBTT */