"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"
+ " -r Range of characters to convert [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"
+ " -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, rather than by code\n"
+ " -e Use cells in sequence, without gaps\n"
" -p Pack the glyphs tightly instead of in a grid\n"
- " -d Write a definition to the given file\n"
+ " -d File name for writing glyph definitions\n"
" -h Print this message\n");
}
glyph->offset_y = face->glyph->bitmap_top-bmp->rows;
glyph->advance = (int)(face->glyph->advance.x+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(bmp->pitch<0)
{
for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
unsigned first, last;
unsigned maxw = 0, maxh = 0;
- for(i=1;; i<<=1)
- {
- first = font->glyphs[0].code&~(i-1);
- last = first+i-1;
- if(last>=font->glyphs[font->n_glyphs-1].code)
- break;
- }
-
+ /* 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;
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;
}
}
+ first = font->glyphs[0].code;
+ if(!seq)
+ first -= first%cpl;
+ last = font->glyphs[font->n_glyphs-1].code;
+
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;
- else
- font->image.h = (last-first+cpl)/cpl*cellh;
- font->image.h = round_to_pot(font->image.h);
+ font->image.h = round_to_pot((last-first+cpl)/cpl*cellh);
font->image.data = (char *)malloc(font->image.w*font->image.h);
memset(font->image.data, 255, font->image.w*font->image.h);
{
unsigned i;
unsigned area = 0;
- unsigned last_h = 0xFFFF;
char *used_glyphs;
- char *used_pixels;
+ unsigned *used_pixels;
unsigned cx = 0, 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);
+ area += (font->glyphs[i].image.w+1)*(font->glyphs[i].image.h+1);
+ /* Find an image size that's no higher than wide, allowing for some
+ imperfections in the packing. */
for(font->image.w=1;; font->image.w<<=1)
{
font->image.h = (area*5/4)/font->image.w;
}
font->image.h = round_to_pot(font->image.h);
+ /* 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 *)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_pixels = (unsigned *)malloc(font->image.w*sizeof(unsigned));
+ memset(used_pixels, 0, font->image.w*sizeof(unsigned));
used_glyphs = (char *)malloc(font->n_glyphs);
memset(used_glyphs, 0, font->n_glyphs);
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<font->image.w && used_pixels[cx]>cy); ++cx)
+ if(used_pixels[cx]-cy-1>target_h)
+ target_h = used_pixels[cx]-cy-1;
- for(; (cx<font->image.w && used_pixels[cx+cy*font->image.w]); ++cx) ;
if(cx>=font->image.w)
{
cx = 0;
++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<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;
+ /* 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+1;
- if(g->image.h==last_h)
+ if(g->image.h==target_h)
score *= g->image.w;
else
score += g->image.w;
continue;
font->image.data[cx+x+(cy+y)*font->image.w] = 255-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; ++x)
{
- if(cx+x<1 || cx+x>font->image.w || cy+y<1 || cy+y>font->image.h)
+ if(cx+x<1 || cx+x>font->image.w)
continue;
- used_pixels[cx+x-1+(cy+y-1)*font->image.w] = 1;
+ if(used_pixels[cx+x-1]<cy+glyph->image.h+1)
+ used_pixels[cx+x-1] = cy+glyph->image.h+1;
}
- last_h = glyph->image.h;
+ if(cy+glyph->image.h>used_h)
+ used_h = cy+glyph->image.h;
}
+
+ /* Trim the image to the actually used size, in case the original estimate
+ was too pessimistic. */
+ font->image.h = round_to_pot(used_h);
}
int save_defs(const char *fn, const Font *font)
return -1;
}
+ fprintf(out, "# Image/font info:\n");
+ fprintf(out, "# width height size ascent descent\n");
fprintf(out, "%d %d %d %d %d\n", font->image.w, font->image.h, font->size, font->ascent, font->descent);
+ fprintf(out, "\n# Glyph info:\n");
+ fprintf(out, "# code x y width height offset_x offset_y advance\n");
for(i=0; i<font->n_glyphs; ++i)
{
const Glyph *g = &font->glyphs[i];
projects / ttf2png.git / blobdiff