typedef struct sImage
{
unsigned w, h;
- char *data;
+ unsigned char *data;
} Image;
typedef struct sGlyph
int range_cmp(const void *, const void *);
unsigned round_to_pot(unsigned);
void *alloc_image_data(size_t, size_t);
-int init_font(Font *, FT_Face, const Range *, unsigned, bool);
-int init_glyphs(Font *, FT_Face, const Range *, bool);
+int init_font(Font *, FT_Face, const Range *, unsigned, bool, unsigned);
+int init_glyphs(Font *, FT_Face, const Range *, bool, 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, bool);
int render_packed(Font *, unsigned, unsigned, bool);
int save_defs(const char *, const Font *);
unsigned margin = 0;
unsigned padding = 1;
bool npot = 0;
+ unsigned distfield = 0;
FT_Library freetype;
FT_Face face;
return 1;
}
- while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:pim:n:f")) != -1)
+ while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:pim:n:gf:")) != -1)
{
switch(i)
{
case 'n':
padding = convert_numeric_option('n', 0);
break;
- case 'f':
+ case 'g':
npot = 1;
break;
+ case 'f':
+ distfield = convert_numeric_option('f', 1);
+ break;
}
}
if(!strcmp(out_fn, "-"))
printf("Glyphs: %ld\n", face->num_glyphs);
}
- err = FT_Set_Pixel_Sizes(face, 0, size);
+ err = FT_Set_Pixel_Sizes(face, 0, (distfield ? size*distfield : size));
if(err)
{
fprintf(stderr, "Couldn't set size\n");
sort_and_compact_ranges(ranges, &n_ranges);
font.size = size;
- err = init_font(&font, face, ranges, n_ranges, autohinter);
+ err = init_font(&font, face, ranges, n_ranges, autohinter, distfield);
if(err)
return 1;
if(err)
return 1;
- if(invert)
+ if(invert || distfield)
{
for(i=0; (unsigned)i<font.image.w*font.image.h; ++i)
font.image.data[i] = 255-font.image.data[i];
}
- err = save_png(out_fn, &font.image, alpha);
+ err = save_png(out_fn, &font.image, (alpha && !distfield));
if(err)
return 1;
free(font.glyphs);
free(font.kerning);
free(font.image.data);
+ free(ranges);
FT_Done_Face(face);
FT_Done_FreeType(freetype);
" -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"
- " -f Allow non-power-of-two result\n"
+ " -g Allow non-power-of-two result\n"
+ " -f Create a distance field texture\n"
" -d File name for writing glyph definitions\n"
" -h Print this message\n");
}
return ptr;
}
-int init_font(Font *font, FT_Face face, const Range *ranges, unsigned n_ranges, bool autohinter)
+int init_font(Font *font, FT_Face face, const Range *ranges, unsigned n_ranges, bool autohinter, unsigned distfield)
{
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=0; i<n_ranges; ++i)
- if(init_glyphs(font, face, &ranges[i], autohinter))
+ if(init_glyphs(font, face, &ranges[i], autohinter, distfield))
return -1;
if(verbose>=1)
kern = &font->kerning[font->n_kerning++];
kern->left_code = font->glyphs[i].code;
kern->right_code = font->glyphs[j].code;
- kern->distance = kerning.x/64;
+ kern->distance = (kerning.x/scale+32)/64;
}
}
return 0;
}
-int init_glyphs(Font *font, FT_Face face, const Range *range, bool autohinter)
+int init_glyphs(Font *font, FT_Face face, const Range *range, bool autohinter, unsigned distfield)
{
unsigned i, j;
unsigned size = font->n_glyphs;
+ int scale = (distfield>0 ? distfield : 1);
for(i=range->first; i<=range->last; ++i)
{
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(" (%s)", utf8);
}
- printf(": glyph %u, size %dx%d\n", n, bmp->width, bmp->rows);
+ 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->offset_x = face->glyph->bitmap_left;
- glyph->offset_y = face->glyph->bitmap_top-bmp->rows;
- glyph->advance = (int)(face->glyph->advance.x+32)/64;
+ 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(copy_bitmap(bmp, &glyph->image))
- return -1;
+ if(distfield)
+ {
+ unsigned margin = 3;
+
+ glyph->offset_x -= margin;
+ glyph->offset_y -= margin;
+ create_distance_field(bmp, &glyph->image, distfield, margin);
+ }
+ else
+ {
+ if(copy_bitmap(bmp, &glyph->image))
+ return -1;
+ }
}
return 0;
{
unsigned x, y;
unsigned char *src;
- char *dst;
+ unsigned char *dst;
image->w = bmp->width;
image->h = bmp->rows;
return 0;
}
- image->data = (char *)malloc(image->w*image->h);
+ image->data = (unsigned char *)malloc(image->w*image->h);
if(!image->data)
{
fprintf(stderr, "Cannot allocate %d bytes of memory for glyph\n", image->w*image->h);
for(y=0; y<bmp->rows; ++y)
{
- for(x=0; x<bmp->width; ++x)
- dst[x] = src[x];
+ 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;
+ while(result*result>num)
+ {
+ unsigned diff = result*result-num;
+ if(diff<result)
+ break;
+
+ result -= (diff+result)/(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)*0x7F/range;
+}
+
+int create_distance_field(const FT_Bitmap *bmp, Image *image, unsigned scale, unsigned margin)
+{
+ unsigned x, y;
+ Image base_image;
+
+ if(!bmp->width || !bmp->rows)
+ {
+ image->w = 0;
+ image->h = 0;
+ image->data = NULL;
+ return 0;
+ }
+
+ if(copy_bitmap(bmp, &base_image))
+ return -1;
+
+ image->w = (base_image.w-1)/scale+2*margin+1;
+ image->h = (base_image.h-1)/scale+2*margin+1;
+ image->data = (unsigned char *)malloc(image->w*image->h);
+ if(!image->data)
+ {
+ fprintf(stderr, "Cannot allocate %d bytes of memory for glyph\n", image->w*image->h);
+ free(base_image.data);
+ return -1;
+ }
+
+ 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, bool npot)
{
unsigned i;
if(!npot)
font->image.h = round_to_pot(font->image.h);
- font->image.data = (char *)alloc_image_data(font->image.w, font->image.h);
+ font->image.data = (unsigned char *)alloc_image_data(font->image.w, font->image.h);
if(!font->image.data)
return -1;
memset(font->image.data, 255, font->image.w*font->image.h);
area = a;
}
- /* Find an image size that's no higher than wide, allowing for some
- imperfections in the packing. */
+ /* 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*5/4)/(font->image.w-margin*2)+margin*2;
+ font->image.h = area/(font->image.w-margin*2)+margin*2;
if(font->image.h<=font->image.w)
break;
}
- if(!npot)
- font->image.h = round_to_pot(font->image.h);
+
+ /* 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. */
- font->image.data = (char *)alloc_image_data(font->image.w, font->image.h);
+ font->image.data = (unsigned char *)alloc_image_data(font->image.w, font->image.h);
if(!font->image.data)
return -1;
memset(font->image.data, 255, font->image.w*font->image.h);
projects / ttf2png.git / blobdiff