/*
ttf2png - True Type Font to PNG converter
-Copyright (c) 2004-2008 Mikko Rasa
+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
typedef struct sImage
{
unsigned w, h;
- char *data;
+ unsigned char *data;
+ unsigned border;
} Image;
typedef struct sGlyph
{
+ unsigned index;
unsigned code;
- Image image;
+ Image image;
unsigned x, y;
- int offset_x;
- int offset_y;
- int advance;
+ 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;
+ int ascent;
+ int descent;
unsigned n_glyphs;
- Glyph *glyphs;
- Image image;
+ Glyph *glyphs;
+ unsigned n_kerning;
+ Kerning *kerning;
+ Image image;
} Font;
+typedef struct sRange
+{
+ unsigned first;
+ unsigned last;
+} Range;
+
+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);
-void usage();
-void init_font(Font *, FT_Face, unsigned, unsigned, int);
-void render_grid(Font *, unsigned, unsigned, unsigned, int);
-void render_packed(Font *);
+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 *, char);
+int save_png(const char *, const Image *, bool, bool, bool);
char verbose = 0;
int main(int argc, char **argv)
{
char *fn;
- int begin = 0;
- int end = 255;
- int size = 10;
- int cpl = 0;
- int cellw = 0;
- int cellh = 0;
- char autohinter = 0;
- char seq = 0;
- char alpha = 0;
- char pack = 0;
+ 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;
+ FT_Face face;
- int err;
- int i;
+ int err;
+ int i;
char *out_fn = "font.png";
char *def_fn = NULL;
return 1;
}
- while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:p")) != -1)
+ while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:pim:n:gf:b:")) != -1)
{
- char *ptr;
- int temp;
switch(i)
{
case 'r':
- if(!strcmp(optarg, "all"))
- {
- begin = 0;
- end = 0x110000;
- }
- else
- {
- 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);
- exit(1);
- }
- 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':
- if(!strcmp(optarg, "auto"))
- {
- cellw = 0;
- cellh = 0;
- }
- else if(!strcmp(optarg, "autorect"))
- {
- cellw = 0;
- cellh = 1;
- }
- else
- {
- cellw = strtol(optarg, &ptr, 0);
- if(ptr[0]=='x' && isdigit(ptr[1]))
- cellh = strtol(ptr+1, NULL, 0);
- }
+ convert_size('c', &cellw, &cellh);
break;
case 'o':
out_fn = optarg;
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, "-"))
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);
if(err)
{
return 1;
}
- font.size = size;
- init_font(&font, face, begin, end, autohinter);
+ if(!n_ranges)
+ {
+ 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)
- render_packed(&font);
+ err = render_packed(&font, margin, padding);
else
- render_grid(&font, cellw, cellh, cpl, seq);
- save_png(out_fn, &font.image, alpha);
+ 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; i<font.n_glyphs; ++i)
+ 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;
return n+1;
}
-void usage()
+int init_image(Image *image, size_t w, size_t h)
{
- printf("ttf2png - True Type Font to PNG converter\n"
- "Copyright (c) 2004-2008 Mikko Rasa, 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 [auto]\n"
- " -c Character cell size, in pixels [auto]\n"
- " -o Output file name (or - for stdout) [font.png]\n"
- " -a Force autohinter\n"
- " -t Render font to alpha channel\n"
- " -v Increase the level of verbosity\n"
- " -e Use cells in sequence, rather than by code\n"
- " -p Pack the glyphs tightly instead of in a grid\n"
- " -d Write a definition to the given file\n"
- " -h Print this message\n");
+ 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;
}
-void init_font(Font *font, FT_Face face, unsigned first, unsigned last, int autohinter)
+int init_font(Font *font, FT_Face face, const Range *ranges, unsigned n_ranges, bool autohinter, unsigned distfield, unsigned border)
{
- unsigned i;
+ unsigned i, j;
unsigned size = 0;
+ int scale = (distfield>0 ? distfield : 1);
- font->ascent = (face->size->metrics.ascender+63)>>6;
- font->descent = (face->size->metrics.descender+63)>>6;
+ font->ascent = (face->size->metrics.ascender/scale+63)/64;
+ font->descent = (face->size->metrics.descender/scale-63)/64;
if(verbose>=1)
{
font->n_glyphs = 0;
font->glyphs = NULL;
- for(i=first; i<=last; ++i)
+ 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;
+ unsigned n;
FT_Bitmap *bmp = &face->glyph->bitmap;
- int x, y;
- int flags = 0;
- Glyph *glyph;
+ int flags = 0;
+ Glyph *glyph;
n = FT_Get_Char_Index(face, i);
if(!n)
if(autohinter)
flags |= FT_LOAD_FORCE_AUTOHINT;
FT_Load_Glyph(face, n, flags);
- FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
+ FT_Render_Glyph(face->glyph, (distfield ? FT_RENDER_MODE_MONO : FT_RENDER_MODE_NORMAL));
if(verbose>=2)
- printf(" Char %u: glyph %u, size %dx%d\n", i, n, bmp->width, bmp->rows);
+ {
+ 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->pixel_mode!=FT_PIXEL_MODE_GRAY)
+ if(bmp->pixel_mode!=FT_PIXEL_MODE_GRAY && bmp->pixel_mode!=FT_PIXEL_MODE_MONO)
{
- fprintf(stderr, "Warning: Glyph %u skipped, not grayscale\n", n);
+ fprintf(stderr, "Warning: Glyph %u skipped, incompatible pixel mode\n", n);
continue;
}
}
glyph = &font->glyphs[font->n_glyphs++];
+ glyph->index = n;
glyph->code = i;
- glyph->image.w = bmp->width;
- glyph->image.h = bmp->rows;
- glyph->image.data = (char *)malloc(bmp->width*bmp->rows);
- glyph->offset_x = face->glyph->bitmap_left;
- glyph->offset_y = face->glyph->bitmap_top-bmp->rows;
- glyph->advance = (int)(face->glyph->advance.x+32)/64;
-
- if(bmp->pitch<0)
+ 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)
{
- for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
- glyph->image.data[x+(glyph->image.h-1-y)*glyph->image.w] = bmp->buffer[x-y*bmp->pitch];
+ glyph->offset_x -= border;
+ glyph->offset_y -= border;
+ create_distance_field(bmp, &glyph->image, distfield, border);
}
else
{
- for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
- glyph->image.data[x+y*glyph->image.w] = bmp->buffer[x+y*bmp->pitch];
+ if(copy_bitmap(bmp, &glyph->image))
+ return -1;
}
}
- if(verbose>=1)
- printf("Loaded %u glyphs\n", font->n_glyphs);
+ return 0;
}
-void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int seq)
+int copy_bitmap(const FT_Bitmap *bmp, Image *image)
{
- unsigned i;
- int top = 0, bot = 0;
- unsigned first, last;
- unsigned maxw = 0, maxh = 0;
+ unsigned x, y;
+ unsigned char *src;
+ unsigned char *dst;
- for(i=1;; i<<=1)
+ 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)
{
- first = font->glyphs[0].code&~(i-1);
- last = first+i-1;
- if(last>=font->glyphs[font->n_glyphs-1].code)
- break;
+ 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;
+}
+
+unsigned sqrti(unsigned num)
+{
+ 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;
if(cellw==0)
{
+ /* Establish a large enough cell to hold all glyphs in the range. */
int square = (cellh==cellw);
cellw = maxw;
cellh = top-bot;
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 || top-bot>cellh)
+ if(maxw>cellw || (unsigned)(top-bot)>cellh)
fprintf(stderr, "Warning: character size exceeds cell size\n");
}
if(cpl==0)
{
- unsigned count = (seq ? font->n_glyphs : last-first+1);
+ /* 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 && (count+cpl-1)/cpl*cellh<=cpl*cellw)
+ if(cpl>0 && font->n_glyphs/cpl*cellh<=cpl*cellw)
break;
}
}
- font->image.w = round_to_pot(cpl*cellw);
- if(seq && font->n_glyphs<last-first+1)
- font->image.h = (font->n_glyphs+cpl-1)/cpl*cellh;
+ first = font->glyphs[0].code;
+ if(seq)
+ n_cells = font->n_glyphs;
else
- font->image.h = (last-first+cpl)/cpl*cellh;
- font->image.h = round_to_pot(font->image.h);
+ {
+ first -= first%cpl;
+ n_cells = font->glyphs[font->n_glyphs-1].code+1-first;
+ }
- font->image.data = (char *)malloc(font->image.w*font->image.h);
- memset(font->image.data, 255, font->image.w*font->image.h);
+ 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;
- int ci, cx, cy;
+ Glyph *glyph;
+ unsigned ci, cx, cy;
unsigned x, y;
glyph = &font->glyphs[i];
for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
{
- if(cx+x<0 || cx+x>=font->image.w || cy+y<0 || cy+y>=font->image.h)
+ if(cx+x>=font->image.w || cy+y>=font->image.h)
continue;
- font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
+ font->image.data[cx+x+(cy+y)*font->image.w] = glyph->image.data[x+y*glyph->image.w];
}
}
+
+ return 0;
}
-void render_packed(Font *font)
+int render_packed(Font *font, unsigned margin, unsigned padding)
{
unsigned i;
- unsigned area = 0;
- unsigned last_h = 0xFFFF;
- char *used_glyphs;
- char *used_pixels;
- unsigned cx = 0, cy;
+ 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)
- area+=(font->glyphs[i].image.w+1)*(font->glyphs[i].image.h+1);
+ {
+ 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)
{
- font->image.h = (area*5/4)/font->image.w;
+ 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;
}
- font->image.h = round_to_pot(font->image.h);
- font->image.data = (char *)malloc(font->image.w*font->image.h);
- memset(font->image.data, 255, font->image.w*font->image.h);
- used_pixels = (char *)malloc(font->image.w*font->image.h);
- memset(used_pixels, 0, font->image.w*font->image.h);
- used_glyphs = (char *)malloc(font->n_glyphs);
+ /* 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=0; cy<font->image.h;)
+ for(cy=margin; cy+margin<font->image.h;)
{
unsigned w;
unsigned x, y;
- Glyph *glyph = NULL;
+ 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;
- for(; (cx<font->image.w && used_pixels[cx+cy*font->image.w]); ++cx) ;
- if(cx>=font->image.w)
+ if(cx+margin>=font->image.w)
{
- cx = 0;
+ cx = margin;
++cy;
- last_h = 0xFFFF;
continue;
}
- for(w=0; (cx+w<font->image.w && !used_pixels[cx+w+cy*font->image.w]); ++w) ;
+ /* 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;
{
unsigned score;
- score = g->image.h+1;
- if(g->image.h==last_h)
+ /* 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;
for(y=0; y<glyph->image.h; ++y) for(x=0; x<glyph->image.w; ++x)
{
- if(cx+x<0 || cx+x>=font->image.w || cy+y<0 || cy+y>=font->image.h)
+ if(cx+x>=font->image.w || cy+y>=font->image.h)
continue;
- font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
+ font->image.data[cx+x+(cy+y)*font->image.w] = glyph->image.data[x+y*glyph->image.w];
}
- for(y=0; y<glyph->image.h+2; ++y) for(x=0; x<glyph->image.w+2; ++x)
+ for(x=0; x<glyph->image.w+2*padding; ++x)
{
- if(cx+x<1 || cx+x>font->image.w || cy+y<1 || cy+y>font->image.h)
+ if(cx+x<padding || cx+x>=font->image.w+padding)
continue;
- used_pixels[cx+x-1+(cy+y-1)*font->image.w] = 1;
+ if(used_pixels[cx+x-padding]<cy+glyph->image.h+padding)
+ used_pixels[cx+x-padding] = cy+glyph->image.h+padding;
}
- last_h = glyph->image.h;
+ 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_defs(const char *fn, const Font *font)
{
- FILE *out;
+ FILE *out;
unsigned i;
out = fopen(fn, "w");
return -1;
}
- fprintf(out, "%d %d %d %d %d\n", font->image.w, font->image.h, font->size, font->ascent, font->descent);
+ 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, "%u %u %u %u %u %d %d %d\n", g->code, g->x, g->y, g->image.w, g->image.h, g->offset_x, g->offset_y, g->advance);
+ 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, char alpha)
+int save_png(const char *fn, const Image *image, bool alpha, bool invert, bool npot)
{
- FILE *out;
+ FILE *out;
png_struct *pngs;
- png_info *pngi;
- png_byte *rows[image->h];
- int i;
- png_byte *data2;
- int color;
+ 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;
return -1;
}
+ 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(image->w*image->h*2);
- for(i=0; i<image->w*image->h; ++i)
+ for(x=0; x<w; ++x)
{
- data2[i*2] = 255;
- data2[i*2+1] = 255-image->data[i];
+ row[x*2] = 255;
+ row[x*2+1] = flip_bits;
}
- for(i=0; i<image->h; ++i)
- rows[i] = (png_byte *)(data2+i*image->w*2);
- color = PNG_COLOR_TYPE_GRAY_ALPHA;
+ for(y=0; y<image->h; ++y)
+ {
+ for(x=0; x<image->w; ++x)
+ row[x*2+1] = *src++^flip_bits;
+ png_write_row(pngs, row);
+ }
+
+ for(x=0; x<w; ++x)
+ row[x*2+1] = 0;
}
else
{
- for(i=0; i<image->h; ++i)
- rows[i] = (png_byte *)(image->data+i*image->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, image->w, image->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);
+
+ for(; y<h; ++y)
+ png_write_row(pngs, row);
+
+ png_write_end(pngs, pngi);
png_destroy_write_struct(&pngs, &pngi);
- if(alpha)
- free(data2);
+ free(row);
if(verbose)
- printf("Saved %dx%d PNG image to %s\n", image->w, image->h, fn);
+ printf("Saved %dx%d PNG image to %s\n", w, h, fn);
fclose(out);
projects / ttf2png.git / blobdiff