/*
ttf2png - True Type Font to PNG converter
-Copyright (c) 2004 Mikkosoft Productions
+Copyright (c) 2004-2021 Mikko Rasa, Mikkosoft Productions
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
*/
#include <stdio.h>
+#include <ctype.h>
#include <unistd.h>
#include <getopt.h>
#include <png.h>
#include <ft2build.h>
#include FT_FREETYPE_H
-void usage();
-int save_png(char *, char *, int, int);
+typedef struct sImage
+{
+ unsigned w, h;
+ unsigned char *data;
+ unsigned border;
+} Image;
+
+typedef struct sGlyph
+{
+ unsigned index;
+ unsigned code;
+ Image image;
+ unsigned x, y;
+ int offset_x;
+ int offset_y;
+ int advance;
+} Glyph;
+
+typedef struct sKerning
+{
+ Glyph *left_glyph;
+ Glyph *right_glyph;
+ int distance;
+} Kerning;
+
+typedef struct sFont
+{
+ unsigned size;
+ int ascent;
+ int descent;
+ unsigned n_glyphs;
+ Glyph *glyphs;
+ unsigned n_kerning;
+ Kerning *kerning;
+ Image image;
+} Font;
+
+typedef struct sRange
+{
+ unsigned first;
+ unsigned last;
+} Range;
-char verbose=0;
-char alpha=0;
+typedef unsigned char bool;
+
+void usage(void);
+int convert_numeric_option(char, int);
+void convert_code_point_range(char, Range *);
+int str_to_code_point(const char *, char **);
+void convert_size(char, unsigned *, unsigned *);
+void sort_and_compact_ranges(Range *, unsigned *);
+int range_cmp(const void *, const void *);
+unsigned round_to_pot(unsigned);
+int init_image(Image *, size_t, size_t);
+int init_font(Font *, FT_Face, const Range *, unsigned, bool, unsigned, unsigned);
+int init_glyphs(Font *, FT_Face, const Range *, bool, unsigned, unsigned);
+int copy_bitmap(const FT_Bitmap *, Image *);
+unsigned sqrti(unsigned);
+unsigned find_distance_to_edge(const Image *, int, int, unsigned);
+int create_distance_field(const FT_Bitmap *, Image *, unsigned, unsigned);
+int render_grid(Font *, unsigned, unsigned, unsigned, bool);
+int render_packed(Font *, unsigned, unsigned);
+int save_defs(const char *, const Font *);
+int save_png(const char *, const Image *, bool, bool, bool);
+
+char verbose = 0;
int main(int argc, char **argv)
{
- FT_Library freetype;
- FT_Face face;
- int err;
- int o;
- int begin=0;
- int end=255;
- char *fn;
- int size=10;
- int cpl=16;
- int w,h;
- int i;
- char *data;
- int ch,cw;
- int cell=16;
- int ascent;
- char *out="font.png";
- const char *name;
- char autohinter=0;
- int count;
+ char *fn;
+ Range *ranges = NULL;
+ unsigned n_ranges = 0;
+ unsigned size = 10;
+ unsigned cpl = 0;
+ unsigned cellw = 0;
+ unsigned cellh = 0;
+ bool autohinter = 0;
+ bool seq = 0;
+ bool alpha = 0;
+ bool invert = 0;
+ bool pack = 0;
+ unsigned margin = 0;
+ unsigned padding = 1;
+ bool npot = 0;
+ unsigned distfield = 0;
+ unsigned border = 0;
+
+ FT_Library freetype;
+ FT_Face face;
+
+ int err;
+ int i;
+
+ char *out_fn = "font.png";
+ char *def_fn = NULL;
+
+ Font font;
if(argc<2)
{
return 1;
}
- while((o=getopt(argc,argv,"r:s:l:c:o:atvh?"))!=-1)
+ while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:pim:n:gf:b:")) != -1)
{
- char *ptr;
- int temp;
- switch(o)
+ switch(i)
{
case 'r':
- if(!isdigit(optarg[0])) temp=-1;
- else
- {
- temp=strtol(optarg,&ptr,0);
- if(ptr[0]!=',' || !isdigit(ptr[1])) temp=-1;
- }
- if(temp<0)
- printf("Not a valid range: %s\n",optarg);
- else
- {
- begin=temp;
- end=strtol(ptr+1,NULL,0);
- }
+ ranges = (Range *)realloc(ranges, (++n_ranges)*sizeof(Range));
+ convert_code_point_range('r', &ranges[n_ranges-1]);
break;
case 's':
- size=strtol(optarg,NULL,0);
+ size = convert_numeric_option('s', 1);
break;
case 'l':
- cpl=strtol(optarg,NULL,0);
+ cpl = convert_numeric_option('l', 1);
break;
case 'c':
- cell=strtol(optarg,NULL,0);
+ convert_size('c', &cellw, &cellh);
break;
case 'o':
- out=optarg;
+ out_fn = optarg;
break;
case 'a':
- autohinter=1;
+ autohinter = 1;
break;
case 't':
- alpha=1;
+ alpha = 1;
break;
case 'v':
++verbose;
case '?':
usage();
return 0;
+ case 'e':
+ seq = 1;
+ break;
+ case 'd':
+ def_fn = optarg;
+ break;
+ case 'p':
+ pack = 1;
+ break;
+ case 'i':
+ invert = 1;
+ break;
+ case 'm':
+ margin = convert_numeric_option('m', 0);
+ break;
+ case 'n':
+ padding = convert_numeric_option('n', 0);
+ break;
+ case 'g':
+ npot = 1;
+ break;
+ case 'f':
+ distfield = convert_numeric_option('f', 1);
+ break;
+ case 'b':
+ border = convert_numeric_option('b', 1);
+ break;
}
}
+ if(!strcmp(out_fn, "-"))
+ verbose = 0;
- if(optind>=argc)
+ if(optind!=argc-1)
{
usage();
return 1;
}
- fn=argv[optind];
- err=FT_Init_FreeType(&freetype);
+ fn = argv[optind];
+
+ err = FT_Init_FreeType(&freetype);
if(err)
{
- fprintf(stderr,"Couldn't initialize FreeType library\n");
+ fprintf(stderr, "Couldn't initialize FreeType library\n");
return 1;
}
- err=FT_New_Face(freetype,fn,0,&face);
+ err = FT_New_Face(freetype, fn, 0, &face);
if(err)
{
- fprintf(stderr,"Couldn't load font file\n");
+ fprintf(stderr, "Couldn't load font file\n");
if(err==FT_Err_Unknown_File_Format)
- fprintf(stderr,"Unknown file format\n");
+ fprintf(stderr, "Unknown file format\n");
return 1;
}
- name=FT_Get_Postscript_Name(face);
if(verbose)
{
- printf("Font name: %s\n",name);
- printf("Glyphs: %ld\n",face->num_glyphs);
+ const char *name = FT_Get_Postscript_Name(face);
+ printf("Font name: %s\n", name);
+ printf("Glyphs: %ld\n", face->num_glyphs);
+ }
+
+ font.size = size;
+ if(distfield)
+ {
+ if(!border)
+ border = sqrti(font.size);
+ size *= distfield;
}
- err=FT_Set_Pixel_Sizes(face,0,size);
+ err = FT_Set_Pixel_Sizes(face, 0, size);
if(err)
{
- fprintf(stderr,"Couldn't set size\n");
+ fprintf(stderr, "Couldn't set size\n");
return 1;
}
- ascent=(face->bbox.yMax*face->size->metrics.x_scale)>>16;
- ascent=(ascent+63)/64;
- ch=((face->bbox.yMax-face->bbox.yMin)*face->size->metrics.y_scale)>>16;
- ch=(ch+63)/64;
- cw=((face->bbox.xMax-face->bbox.xMin)*face->size->metrics.x_scale)>>16;
- cw=(cw+63)/64;
- if(verbose)
+
+ if(!n_ranges)
{
- printf("Ascent %d\n",ascent);
- printf("Descent %ld\n",(((face->bbox.yMin*face->size->metrics.y_scale)>>16)+63)/64);
- printf("Max height %d\n",ch);
- printf("Max width %d\n",cw);
- }
- if(verbose>=1 && (ch>cell || cw>cell)) fprintf(stderr,"Warning: character size exceeds cell size\n");
-
- w=cpl*cell;
- h=(end-begin+cpl-1)/cpl*cell;
- data=(char *)malloc(w*h);
- memset(data,255,w*h);
-
- count=0;
- for(i=begin;i<=end;++i)
- {
- int glyph=FT_Get_Char_Index(face,i);
- FT_Bitmap *bmp=&face->glyph->bitmap;
- int x,y;
- int cx=(i%cpl)*cell;
- int cy=(i/cpl)*cell;
- int flags=0;
- int dy;
- if(!glyph) continue;
- fflush(stdout);
- if(autohinter) flags|=FT_LOAD_FORCE_AUTOHINT;
- FT_Load_Glyph(face,glyph,flags);
- FT_Render_Glyph(face->glyph,FT_RENDER_MODE_NORMAL);
- if(cell>bmp->width) cx+=(cell-bmp->width)/2;
- dy=ascent-face->glyph->bitmap_top;
- cy+=dy;
+ ranges = malloc(sizeof(Range));
+ ranges[0].first = 0;
+ ranges[0].last = 255;
+ n_ranges = 1;
+ }
+ else
+ sort_and_compact_ranges(ranges, &n_ranges);
+
+ err = init_font(&font, face, ranges, n_ranges, autohinter, distfield, border);
+ if(err)
+ return 1;
+
+ if(!font.n_glyphs)
+ {
+ fprintf(stderr, "No glyphs found in the requested range\n");
+ return 1;
+ }
+
+ if(pack)
+ err = render_packed(&font, margin, padding);
+ else
+ err = render_grid(&font, cellw, cellh, cpl, seq);
+ if(err)
+ return 1;
+
+ err = save_png(out_fn, &font.image, (alpha && !distfield), (invert || distfield), npot);
+ if(err)
+ return 1;
+
+ if(def_fn)
+ save_defs(def_fn, &font);
+
+ for(i=0; (unsigned)i<font.n_glyphs; ++i)
+ free(font.glyphs[i].image.data);
+ free(font.glyphs);
+ free(font.kerning);
+ free(font.image.data);
+ free(ranges);
+
+ FT_Done_Face(face);
+ FT_Done_FreeType(freetype);
+
+ return 0;
+}
+
+void usage(void)
+{
+ printf("ttf2png 2.0 - True Type Font to PNG converter\n"
+ "Copyright (c) 2004-2021 Mikko Rasa, Mikkosoft Productions\n"
+ "Distributed under the GNU General Public License\n\n");
+
+ printf("Usage: ttf2png [options] <TTF file>\n\n");
+
+ printf("Accepted options (default values in [brackets])\n"
+ " -r Range of code points to convert [0,255]\n"
+ " -s Font size to use, in pixels [10]\n"
+ " -l Number of glyphs to put in one line [auto]\n"
+ " -c Glyph cell size, in pixels (grid mode only) [auto]\n"
+ " -o Output file name (or - for stdout) [font.png]\n");
+ printf(" -a Force autohinter\n"
+ " -t Render glyphs to alpha channel\n"
+ " -i Invert colors of the glyphs\n"
+ " -v Increase the level of verbosity\n"
+ " -e Use cells in sequence, without gaps (grid mode only)\n"
+ " -p Pack the glyphs tightly instead of in a grid\n"
+ " -m Margin around image edges (packed mode only) [0]\n"
+ " -n Padding between glyphs (packed mode only) [1]\n"
+ " -g Allow non-power-of-two result\n");
+ printf(" -f Create a distance field texture\n"
+ " -b Specify distance field border zone width\n"
+ " -d File name for writing glyph definitions\n"
+ " -h Print this message\n");
+}
+
+int convert_numeric_option(char opt, int min_value)
+{
+ int value;
+ char *ptr;
+
+ value = strtol(optarg, &ptr, 0);
+ if(value<min_value || *ptr)
+ {
+ printf("Invalid option argument in -%c %s\n", opt, optarg);
+ exit(1);
+ }
+
+ return value;
+}
+
+void convert_code_point_range(char opt, Range *range)
+{
+ int value;
+ char *ptr;
+
+ if(!strcmp(optarg, "all"))
+ {
+ range->first = 0;
+ range->last = 0x10FFFF;
+ return;
+ }
+
+ value = str_to_code_point(optarg, &ptr);
+ if(value>=0 && *ptr==',')
+ {
+ range->first = value;
+ value = str_to_code_point(ptr+1, &ptr);
+ if(value>=(int)range->first && !*ptr)
+ {
+ range->last = value;
+ return;
+ }
+ }
+
+ printf("Invalid option argument in -%c %s\n", opt, optarg);
+ exit(1);
+}
+
+int str_to_code_point(const char *nptr, char **endptr)
+{
+ if(nptr[0]=='U' && nptr[1]=='+')
+ return strtoul(nptr+2, endptr, 16);
+ else if(nptr[0]&0x80)
+ {
+ unsigned bytes;
+ unsigned code;
+ unsigned i;
+
+ if(endptr)
+ *endptr = (char *)nptr;
+
+ for(bytes=1; (bytes<4 && (nptr[0]&(0x80>>bytes))); ++bytes)
+ if((nptr[bytes]&0xC0)!=0x80)
+ return -1;
+ if(bytes<2)
+ return -1;
+
+ code = nptr[0]&(0x3F>>bytes);
+ for(i=1; i<bytes; ++i)
+ code = (code<<6)|(nptr[i]&0x3F);
+
+ if(endptr)
+ *endptr = (char *)nptr+bytes;
+
+ return code;
+ }
+ else if(isdigit(nptr[0]))
+ return strtoul(nptr, endptr, 0);
+ else
+ {
+ if(endptr)
+ *endptr = (char *)nptr+1;
+ return *nptr;
+ }
+}
+
+void convert_size(char opt, unsigned *width, unsigned *height)
+{
+ int value;
+ char *ptr;
+
+ if(!strcmp(optarg, "auto"))
+ {
+ *width = 0;
+ *height = 0;
+ return;
+ }
+ else if(!strcmp(optarg, "autorect"))
+ {
+ *width = 0;
+ *height = 1;
+ return;
+ }
+
+ value = strtol(optarg, &ptr, 0);
+ if(value>0)
+ {
+ *width = value;
+ if(*ptr=='x')
+ {
+ value = strtol(ptr+1, &ptr, 0);
+ if(value>0 && !*ptr)
+ {
+ *height = value;
+ return;
+ }
+ }
+ else if(!*ptr)
+ {
+ *height = *width;
+ return;
+ }
+ }
+
+ printf("Invalid option argument in -%c %s\n", opt, optarg);
+ exit(1);
+}
+
+void sort_and_compact_ranges(Range *ranges, unsigned *n_ranges)
+{
+ unsigned i, j;
+
+ if(!*n_ranges)
+ return;
+
+ qsort(ranges, *n_ranges, sizeof(Range), &range_cmp);
+ for(i=0, j=1; j<*n_ranges; ++j)
+ {
+ if(ranges[i].last+1>=ranges[j].first)
+ {
+ if(ranges[j].last>ranges[i].last)
+ ranges[i].last = ranges[j].last;
+ }
+ else
+ {
+ ++i;
+ if(i!=j)
+ ranges[i] = ranges[j];
+ }
+ }
+
+ *n_ranges = i+1;
+}
+
+int range_cmp(const void *p1, const void *p2)
+{
+ const Range *r1 = (const Range *)p1;
+ const Range *r2 = (const Range *)p2;
+ if(r1->first!=r2->first)
+ return (r1->first<r2->first ? -1 : 1);
+ else if(r1->last!=r2->last)
+ return (r1->last<r2->last ? -1 : 1);
+ else
+ return 0;
+}
+
+unsigned round_to_pot(unsigned n)
+{
+ n -= 1;
+ n |= n>>1;
+ n |= n>>2;
+ n |= n>>4;
+ n |= n>>8;
+ n |= n>>16;
+
+ return n+1;
+}
+
+int init_image(Image *image, size_t w, size_t h)
+{
+ size_t s;
+
+ image->w = w;
+ image->h = h;
+ image->data = NULL;
+ image->border = 0;
+
+ if(!image->w || !image->h)
+ return 0;
+
+ s = w*h;
+ if(s/h!=w)
+ {
+ fprintf(stderr, "Cannot allocate memory for a %dx%d image\n", image->w, image->h);
+ return -1;
+ }
+
+ image->data = malloc(s);
+ if(!image->data)
+ {
+ fprintf(stderr, "Cannot allocate memory for a %dx%d image\n", image->w, image->h);
+ return -1;
+ }
+
+ return 0;
+}
+
+int init_font(Font *font, FT_Face face, const Range *ranges, unsigned n_ranges, bool autohinter, unsigned distfield, unsigned border)
+{
+ unsigned i, j;
+ unsigned size = 0;
+ int scale = (distfield>0 ? distfield : 1);
+
+ font->ascent = (face->size->metrics.ascender/scale+63)/64;
+ font->descent = (face->size->metrics.descender/scale-63)/64;
+
+ if(verbose>=1)
+ {
+ printf("Ascent: %d\n", font->ascent);
+ printf("Descent: %d\n", font->descent);
+ }
+
+ font->n_glyphs = 0;
+ font->glyphs = NULL;
+ for(i=0; i<n_ranges; ++i)
+ if(init_glyphs(font, face, &ranges[i], autohinter, distfield, border))
+ return -1;
+
+ if(verbose>=1)
+ printf("Loaded %u glyphs\n", font->n_glyphs);
+
+ font->n_kerning = 0;
+ font->kerning = NULL;
+ for(i=0; i<font->n_glyphs; ++i) for(j=0; j<font->n_glyphs; ++j)
+ if(j!=i)
+ {
+ FT_Vector kerning;
+ FT_Get_Kerning(face, font->glyphs[i].index, font->glyphs[j].index, FT_KERNING_DEFAULT, &kerning);
+
+ /* FreeType documentation says that vertical kerning is practically
+ never used, so we ignore it. */
+ if(kerning.x)
+ {
+ Kerning *kern;
+
+ if(font->n_kerning>=size)
+ {
+ size += 16;
+ font->kerning = (Kerning *)realloc(font->kerning, size*sizeof(Kerning));
+ }
+
+ kern = &font->kerning[font->n_kerning++];
+ kern->left_glyph = &font->glyphs[i];
+ kern->right_glyph = &font->glyphs[j];
+ kern->distance = (kerning.x/scale+32)/64;
+ }
+ }
+
+ if(verbose>=1)
+ printf("Loaded %d kerning pairs\n", font->n_kerning);
+
+ return 0;
+}
+
+int init_glyphs(Font *font, FT_Face face, const Range *range, bool autohinter, unsigned distfield, unsigned border)
+{
+ unsigned i, j;
+ unsigned size = font->n_glyphs;
+ int scale = (distfield>0 ? distfield : 1);
+
+ for(i=range->first; i<=range->last; ++i)
+ {
+ unsigned n;
+ FT_Bitmap *bmp = &face->glyph->bitmap;
+ int flags = 0;
+ Glyph *glyph;
+
+ n = FT_Get_Char_Index(face, i);
+ if(!n)
+ continue;
+
+ if(autohinter)
+ flags |= FT_LOAD_FORCE_AUTOHINT;
+ FT_Load_Glyph(face, n, flags);
+ FT_Render_Glyph(face->glyph, (distfield ? FT_RENDER_MODE_MONO : FT_RENDER_MODE_NORMAL));
+
if(verbose>=2)
{
- printf(" Char %d: glyph %d, size %dx%d\n",i,glyph,bmp->width,bmp->rows);
- if(bmp->width>cell || dy+bmp->rows>cell || dy<0) printf(" Warning: Character %d does not fit in cell\n",i);
+ printf(" Code point U+%04X", i);
+ if(i>=0x20 && i<0x7F)
+ printf(" (%c)", i);
+ else if(i>=0xA0 && i<=0x10FFFF)
+ {
+ char utf8[5];
+ unsigned bytes;
+
+ for(bytes=2; i>>(1+bytes*5); ++bytes) ;
+ for(j=0; j<bytes; ++j)
+ utf8[j] = 0x80 | ((i>>((bytes-j-1)*6))&0x3F);
+ utf8[0] |= 0xF0<<(4-bytes);
+ utf8[j] = 0;
+
+ printf(" (%s)", utf8);
+ }
+ printf(": glyph %u, size %dx%d\n", n, bmp->width/scale, bmp->rows/scale);
}
- if(bmp->pitch<0)
+
+ if(bmp->pixel_mode!=FT_PIXEL_MODE_GRAY && bmp->pixel_mode!=FT_PIXEL_MODE_MONO)
{
- fprintf(stderr,"Warning: Character %d not rendered (can't handle reversed bitmaps)\n",i);
+ fprintf(stderr, "Warning: Glyph %u skipped, incompatible pixel mode\n", n);
continue;
}
- for(y=0;y<bmp->rows;++y) for(x=0;x<bmp->width;++x)
+
+ if(font->n_glyphs>=size)
+ {
+ size += 16;
+ font->glyphs = (Glyph *)realloc(font->glyphs, size*sizeof(Glyph));
+ }
+
+ glyph = &font->glyphs[font->n_glyphs++];
+ glyph->index = n;
+ glyph->code = i;
+ glyph->offset_x = (int)(face->glyph->bitmap_left+scale/2)/scale;
+ glyph->offset_y = (int)(face->glyph->bitmap_top-bmp->rows+scale/2)/scale;
+ glyph->advance = (int)(face->glyph->advance.x/scale+32)/64;
+
+ /* Copy the glyph image since FreeType uses a global buffer, which would
+ be overwritten by the next glyph. Negative pitch means the scanlines
+ start from the bottom. */
+ if(distfield)
+ {
+ glyph->offset_x -= border;
+ glyph->offset_y -= border;
+ create_distance_field(bmp, &glyph->image, distfield, border);
+ }
+ else
{
- if(cx+x<0 || cx+x>=w || cy+y<0 || cy+y>=h) continue;
- data[cx+x+(cy+y)*w]=255-bmp->buffer[x+y*bmp->pitch];
+ if(copy_bitmap(bmp, &glyph->image))
+ return -1;
}
- ++count;
}
- save_png(out,data,w,h);
+ return 0;
+}
- if(verbose) printf("Converted %d glyphs\n",count);
+int copy_bitmap(const FT_Bitmap *bmp, Image *image)
+{
+ unsigned x, y;
+ unsigned char *src;
+ unsigned char *dst;
+
+ if(init_image(image, bmp->width, bmp->rows))
+ return -1;
+ if(!image->w || !image->h)
+ return 0;
+
+ if(bmp->pitch<0)
+ src = bmp->buffer+(bmp->rows-1)*-bmp->pitch;
+ else
+ src = bmp->buffer;
+ dst = image->data;
+
+ for(y=0; y<bmp->rows; ++y)
+ {
+ if(bmp->pixel_mode==FT_PIXEL_MODE_MONO)
+ {
+ for(x=0; x<bmp->width; ++x)
+ dst[x] = ((src[x/8]&(0x80>>(x%8))) ? 0xFF : 0x00);
+ }
+ else
+ {
+ for(x=0; x<bmp->width; ++x)
+ dst[x] = src[x];
+ }
+
+ src += bmp->pitch;
+ dst += image->w;
+ }
return 0;
}
-void usage()
+unsigned sqrti(unsigned num)
{
- printf("ttf2png - True Type Font to PNG converter\n"
- "Copyright (c) 2004 Mikkosoft Productions\n"
- "Distributed under the GNU General Public License\n\n"
- "Usage: ttf2png [options] <TTF file>\n\n"
- "Accepted options (default values in [brackets])\n"
- " -r Range of characters to convert in the format low,high [0,255]\n"
- " -s Font size to use, in pixels [10]\n"
- " -l Number of characters to put in one line [16]\n"
- " -c Character cell size, in pixels [16]\n"
- " -o Output file name [font.png]\n"
- " -a Force autohinter\n"
- " -t Render font to alpha channel\n"
- " -v Increase the level of verbosity\n"
- " -h Print this message\n");
+ unsigned result = (num>0xFFFF ? 0xFFFF : 0x100);
+ while(result && result*result>=result+num)
+ result -= (result*result+result-num)/(result*2);
+
+ return result;
+}
+
+unsigned find_distance_to_edge(const Image *image, int origin_x, int origin_y, unsigned range)
+{
+ unsigned i, j;
+ int x, y;
+ unsigned char origin_pixel = 0;
+ unsigned closest = range*range;
+
+ if(origin_x>=0 && (unsigned)origin_x<image->w && origin_y>=0 && (unsigned)origin_y<image->h)
+ origin_pixel = image->data[origin_x+origin_y*image->w];
+
+ x = origin_x-1;
+ y = origin_y-1;
+ for(i=1; (i<range && i*i<=closest); ++i, --x, --y) for(j=0; j<4; ++j)
+ {
+ unsigned k;
+ int dx = (j==0 ? 1 : j==2 ? -1 : 0);
+ int dy = (j==1 ? 1 : j==3 ? -1 : 0);
+
+ for(k=0; k<i*2; ++k, x+=dx, y+=dy)
+ {
+ unsigned char pixel = 0;
+ if(x>=0 && (unsigned)x<image->w && y>=0 && (unsigned)y<image->h)
+ pixel = image->data[x+y*image->w];
+
+ if((pixel^origin_pixel)&0x80)
+ {
+ unsigned d = 2*i*i + k*k - 2*k*i;
+ if(d<closest)
+ closest = d;
+ }
+ }
+ }
+
+ return sqrti(closest*0x3F01)/range;
+}
+
+int create_distance_field(const FT_Bitmap *bmp, Image *image, unsigned scale, unsigned margin)
+{
+ unsigned x, y;
+ Image base_image;
+
+ if(init_image(image, (bmp->width+scale-1)/scale+2*margin, (bmp->rows+scale-1)/scale+2*margin))
+ return -1;
+ if(!image->w || !image->h)
+ return 0;
+
+ if(copy_bitmap(bmp, &base_image))
+ return -1;
+
+ image->border = margin;
+ for(y=0; y<image->h; ++y) for(x=0; x<image->w; ++x)
+ {
+ int bx = (x-margin)*scale+scale/2;
+ int by = (y-margin)*scale+scale/2;
+ unsigned char pixel = find_distance_to_edge(&base_image, bx, by, margin*scale);
+ if(bx>=0 && (unsigned)bx<base_image.w && by>=0 && (unsigned)by<base_image.h)
+ pixel |= base_image.data[bx+by*base_image.w]&0x80;
+ if(!(pixel&0x80))
+ pixel = 0x80-pixel;
+ image->data[x+y*image->w] = pixel;
+ }
+
+ free(base_image.data);
+
+ return 0;
+}
+
+int render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, bool seq)
+{
+ unsigned i;
+ int top = 0, bot = 0;
+ unsigned first, n_cells;
+ unsigned maxw = 0, maxh = 0;
+
+ /* Find extremes of the glyph images. */
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ int y;
+
+ y = font->glyphs[i].offset_y+font->glyphs[i].image.h;
+ if(y>top)
+ top = y;
+ if(font->glyphs[i].offset_y<bot)
+ bot = font->glyphs[i].offset_y;
+ if(font->glyphs[i].image.w>maxw)
+ maxw = font->glyphs[i].image.w;
+ if(font->glyphs[i].image.h>maxh)
+ maxh = font->glyphs[i].image.h;
+ }
+
+ if(cellw==0)
+ {
+ /* Establish a large enough cell to hold all glyphs in the range. */
+ int square = (cellh==cellw);
+ cellw = maxw;
+ cellh = top-bot;
+ if(square)
+ {
+ if(cellh>cellw)
+ cellw = cellh;
+ else
+ cellh = cellw;
+ }
+ }
+
+ if(verbose>=1)
+ {
+ printf("Max size: %u x %u\n", maxw, maxh);
+ printf("Y range: [%d %d]\n", bot, top);
+ printf("Cell size: %u x %u\n", cellw, cellh);
+ if(maxw>cellw || (unsigned)(top-bot)>cellh)
+ fprintf(stderr, "Warning: character size exceeds cell size\n");
+ }
+
+ if(cpl==0)
+ {
+ /* Determine number of characters per line, trying to fit all the glyphs
+ in a square image. */
+ for(i=1;; i<<=1)
+ {
+ cpl = i/cellw;
+ if(cpl>0 && font->n_glyphs/cpl*cellh<=cpl*cellw)
+ break;
+ }
+ }
+
+ first = font->glyphs[0].code;
+ if(seq)
+ n_cells = font->n_glyphs;
+ else
+ {
+ first -= first%cpl;
+ n_cells = font->glyphs[font->n_glyphs-1].code+1-first;
+ }
+
+ if(init_image(&font->image, cpl*cellw, (n_cells+cpl-1)/cpl*cellh))
+ return -1;
+ memset(font->image.data, 0, font->image.w*font->image.h);
+
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ Glyph *glyph;
+ unsigned ci, cx, cy;
+ unsigned x, y;
+
+ glyph = &font->glyphs[i];
+
+ if(seq)
+ ci = i;
+ else
+ ci = glyph->code-first;
+
+ cx = (ci%cpl)*cellw;
+ cy = (ci/cpl)*cellh;
+
+ if(cellw>glyph->image.w)
+ cx += (cellw-glyph->image.w)/2;
+ cy += top-glyph->offset_y-glyph->image.h;
+
+ glyph->x = cx;
+ glyph->y = cy;
+
+ for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
+ {
+ if(cx+x>=font->image.w || cy+y>=font->image.h)
+ continue;
+ font->image.data[cx+x+(cy+y)*font->image.w] = glyph->image.data[x+y*glyph->image.w];
+ }
+ }
+
+ return 0;
+}
+
+int render_packed(Font *font, unsigned margin, unsigned padding)
+{
+ unsigned i;
+ size_t area = 0;
+ bool *used_glyphs;
+ unsigned *used_pixels;
+ unsigned cx = margin, cy;
+ unsigned used_h = 0;
+
+ /* Compute the total area occupied by glyphs and padding. */
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ size_t a = area+(font->glyphs[i].image.w+padding)*(font->glyphs[i].image.h+padding);
+ if(a<area)
+ {
+ fprintf(stderr, "Overflow in counting total glyph area\n");
+ return -1;
+ }
+ area = a;
+ }
+
+ /* Find an image size that's approximately square. */
+ for(font->image.w=1;; font->image.w<<=1)
+ {
+ if(font->image.w<=margin*2)
+ continue;
+ font->image.h = area/(font->image.w-margin*2)+margin*2;
+ if(font->image.h<=font->image.w)
+ break;
+ }
+
+ /* Add some extra space to accommodate packing imperfections. */
+ font->image.h = font->image.h*3/2;
+
+ /* Allocate arrays for storing the image and keeping track of used pixels and
+ glyphs. Since glyphs are rectangular and the image is filled starting from
+ the top, it's enough to track the number of used pixels at the top of each
+ column. */
+ if(init_image(&font->image, font->image.w, font->image.h))
+ return -1;
+ memset(font->image.data, 0, font->image.w*font->image.h);
+ used_pixels = (unsigned *)malloc(font->image.w*sizeof(unsigned));
+ memset(used_pixels, 0, font->image.w*sizeof(unsigned));
+ used_glyphs = (bool *)malloc(font->n_glyphs);
+ memset(used_glyphs, 0, font->n_glyphs);
+
+ for(cy=margin; cy+margin<font->image.h;)
+ {
+ unsigned w;
+ unsigned x, y;
+ Glyph *glyph = NULL;
+ unsigned best_score = 0;
+ unsigned target_h = 0;
+
+ /* Find the leftmost free pixel on this row. Also record the lowest
+ extent of glyphs to the left of the free position. */
+ for(; (cx+margin<font->image.w && used_pixels[cx]>cy); ++cx)
+ if(used_pixels[cx]-cy-padding>target_h)
+ target_h = used_pixels[cx]-cy-padding;
+
+ if(cx+margin>=font->image.w)
+ {
+ cx = margin;
+ ++cy;
+ continue;
+ }
+
+ /* Count the free pixel at this position. */
+ for(w=0; (cx+w+margin<font->image.w && used_pixels[cx+w]<=cy); ++w) ;
+
+ /* Find a suitable glyph to put here. */
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ Glyph *g;
+
+ g = &font->glyphs[i];
+ if(!used_glyphs[i] && g->image.w<=w)
+ {
+ unsigned score;
+
+ /* Prefer glyphs that would reach exactly as low as the ones left
+ of here. This aims to create a straight edge at the bottom for
+ lining up further glyphs. */
+ score = g->image.h+padding;
+ if(g->image.h==target_h)
+ score *= g->image.w;
+ else
+ score += g->image.w;
+
+ if(score>best_score)
+ {
+ glyph = g;
+ best_score = score;
+ }
+ }
+ }
+
+ if(!glyph)
+ {
+ cx += w;
+ continue;
+ }
+
+ used_glyphs[glyph-font->glyphs] = 1;
+ glyph->x = cx;
+ glyph->y = cy;
+
+ for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
+ {
+ if(cx+x>=font->image.w || cy+y>=font->image.h)
+ continue;
+ font->image.data[cx+x+(cy+y)*font->image.w] = glyph->image.data[x+y*glyph->image.w];
+ }
+ for(x=0; x<glyph->image.w+2*padding; ++x)
+ {
+ if(cx+x<padding || cx+x>=font->image.w+padding)
+ continue;
+ if(used_pixels[cx+x-padding]<cy+glyph->image.h+padding)
+ used_pixels[cx+x-padding] = cy+glyph->image.h+padding;
+ }
+
+ if(cy+glyph->image.h+margin>used_h)
+ used_h = cy+glyph->image.h+margin;
+ }
+
+ /* Trim the image to the actually used size, in case the original estimate
+ was too pessimistic. */
+ font->image.h = used_h;
+
+ free(used_glyphs);
+ free(used_pixels);
+
+ return 0;
}
-int save_png(char *fn, char *data, int w, int h)
+int save_defs(const char *fn, const Font *font)
{
- FILE *out;
- png_struct *pngs;
- png_info *pngi;
- png_byte *rows[h];
- int i;
- png_byte *data2;
- int color;
-
- out=fopen(fn,"wb");
+ FILE *out;
+ unsigned i;
+
+ out = fopen(fn, "w");
if(!out)
{
- fprintf(stderr,"Couldn't open output file\n");
+ fprintf(stderr, "Couldn't open %s\n",fn);
return -1;
}
- pngs=png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
+ fprintf(out, "# Image/font info:\n");
+ fprintf(out, "# width height size ascent descent\n");
+ fprintf(out, "font %d %d %d %d %d\n", font->image.w, font->image.h, font->size, font->ascent, font->descent);
+
+ fprintf(out, "\n# Code point mapping:\n");
+ fprintf(out, "# code index\n");
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ const Glyph *g = &font->glyphs[i];
+ fprintf(out, "code %u %u\n", g->code, g->index);
+ }
+
+ fprintf(out, "\n# Metrics info:\n");
+ fprintf(out, "# index width height offset_x offset_y advance\n");
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ const Glyph *g = &font->glyphs[i];
+ int b = g->image.border;
+ fprintf(out, "metrics %u %u %u %d %d %d\n", g->index, g->image.w-2*b, g->image.h-2*b, g->offset_x+b, g->offset_y+b, g->advance);
+ }
+
+ fprintf(out, "\n# Glyph info:\n");
+ fprintf(out, "# index x y width height border\n");
+ for(i=0; i<font->n_glyphs; ++i)
+ {
+ const Glyph *g = &font->glyphs[i];
+ fprintf(out, "glyph %u %u %u %u %u %u\n", g->index, g->x, g->y, g->image.w, g->image.h, g->image.border);
+ }
+
+ fprintf(out, "\n# Kerning info:\n");
+ fprintf(out, "# left right distance\n");
+ for(i=0; i<font->n_kerning; ++i)
+ {
+ const Kerning *k = &font->kerning[i];
+ fprintf(out, "kern %u %u %d\n", k->left_glyph->index, k->right_glyph->index, k->distance);
+ }
+
+ fclose(out);
+
+ return 0;
+}
+
+int save_png(const char *fn, const Image *image, bool alpha, bool invert, bool npot)
+{
+ FILE *out;
+ png_struct *pngs;
+ png_info *pngi;
+ unsigned w, h;
+ png_byte *row;
+ unsigned x, y;
+ int color;
+ unsigned flip_bits = (invert==alpha ? 0xFF : 0x00);
+ unsigned char *src = image->data;
+
+ if(!strcmp(fn, "-"))
+ out = stdout;
+ else
+ {
+ out = fopen(fn, "wb");
+ if(!out)
+ {
+ fprintf(stderr, "Couldn't open %s\n",fn);
+ return -1;
+ }
+ }
+
+ pngs = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!pngs)
{
- fprintf(stderr,"Error writing PNG file\n");
+ fprintf(stderr, "Error writing PNG file\n");
return -1;
}
- pngi=png_create_info_struct(pngs);
+ pngi = png_create_info_struct(pngs);
if(!pngi)
{
- png_destroy_write_struct(&pngs,NULL);
- fprintf(stderr,"Error writing PNG file\n");
+ png_destroy_write_struct(&pngs, NULL);
+ fprintf(stderr, "Error writing PNG file\n");
return -1;
}
- png_init_io(pngs,out);
+ w = (npot ? image->w : round_to_pot(image->w));
+ h = (npot ? image->h : round_to_pot(image->h));
+ color = (alpha ? PNG_COLOR_TYPE_GRAY_ALPHA : PNG_COLOR_TYPE_GRAY);
+ png_set_IHDR(pngs, pngi, w, h, 8, color, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+ png_init_io(pngs, out);
+ png_write_info(pngs, pngi);
+ row = (png_byte *)malloc(w*(1+alpha));
if(alpha)
{
- data2=(png_byte *)malloc(w*h*2);
- for(i=0;i<w*h;++i)
+ for(x=0; x<w; ++x)
+ {
+ row[x*2] = 255;
+ row[x*2+1] = flip_bits;
+ }
+ for(y=0; y<image->h; ++y)
{
- data2[i*2]=255;
- data2[i*2+1]=255-data[i];
+ for(x=0; x<image->w; ++x)
+ row[x*2+1] = *src++^flip_bits;
+ png_write_row(pngs, row);
}
- for(i=0;i<h;++i)
- rows[i]=(png_byte *)(data2+i*w*2);
- color=PNG_COLOR_TYPE_GRAY_ALPHA;
+
+ for(x=0; x<w; ++x)
+ row[x*2+1] = 0;
}
else
{
- for(i=0;i<h;++i)
- rows[i]=(png_byte *)(data+i*w);
- color=PNG_COLOR_TYPE_GRAY;
+ memset(row+image->w, flip_bits, w-image->w);
+ for(y=0; y<image->h; ++y)
+ {
+ for(x=0; x<image->w; ++x)
+ row[x] = *src++^flip_bits;
+ png_write_row(pngs, row);
+ }
+
+ memset(row, flip_bits, w);
}
- png_set_IHDR(pngs,pngi,w,h,8,color,PNG_INTERLACE_NONE,PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
- png_set_rows(pngs,pngi,rows);
- png_write_png(pngs,pngi,PNG_TRANSFORM_IDENTITY,NULL);
- png_destroy_write_struct(&pngs,&pngi);
- if(alpha) free(data2);
- if(verbose) printf("Saved %dx%d PNG image to %s\n",w,h,fn);
+ for(; y<h; ++y)
+ png_write_row(pngs, row);
+
+ png_write_end(pngs, pngi);
+ png_destroy_write_struct(&pngs, &pngi);
+ free(row);
+
+ if(verbose)
+ printf("Saved %dx%d PNG image to %s\n", w, h, fn);
+
+ fclose(out);
return 0;
}
projects / ttf2png.git / blobdiff