Image image;
} Font;
-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 *);
+unsigned round_to_pot(unsigned);
+void *alloc_image_data(size_t, size_t);
+int init_font(Font *, FT_Face, unsigned, unsigned, int);
+int render_grid(Font *, unsigned, unsigned, unsigned, int);
+int render_packed(Font *, unsigned, unsigned);
int save_defs(const char *, const Font *);
int save_png(const char *, const Image *, char);
char alpha = 0;
char invert = 0;
char pack = 0;
+ int margin = 0;
+ int padding = 1;
FT_Library freetype;
FT_Face face;
return 1;
}
- while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:pi")) != -1)
+ while((i = getopt(argc, argv, "r:s:l:c:o:atvh?ed:pim:n:")) != -1)
{
char *ptr;
int temp;
case 'i':
invert = 1;
break;
+ case 'm':
+ margin = strtol(optarg, NULL, 0);
+ break;
+ case 'n':
+ padding = strtol(optarg, NULL, 0);
+ break;
}
}
if(!strcmp(out_fn, "-"))
}
font.size = size;
- init_font(&font, face, begin, end, autohinter);
+ err = init_font(&font, face, begin, end, autohinter);
+ if(err)
+ return 1;
+
if(pack)
- render_packed(&font);
+ err = render_packed(&font, margin, padding);
else
- render_grid(&font, cellw, cellh, cpl, seq);
+ err = render_grid(&font, cellw, cellh, cpl, seq);
+ if(err)
+ return 1;
+
if(invert)
{
for(i=0; (unsigned)i<font.image.w*font.image.h; ++i)
font.image.data[i] = 255-font.image.data[i];
}
- save_png(out_fn, &font.image, alpha);
+ err = save_png(out_fn, &font.image, alpha);
+ 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);
FT_Done_Face(face);
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;
-}
-
void usage()
{
- printf("ttf2png - True Type Font to PNG converter\n"
+ printf("ttf2png 1.0 - 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");
" -v Increase the level of verbosity\n"
" -e Use cells in sequence, without gaps\n"
" -p Pack the glyphs tightly instead of in a grid\n"
+ " -m Margin around image edges in packed mode [0]\n"
+ " -n Padding between packed glyphs [1]\n"
" -d File name for writing glyph definitions\n"
" -h Print this message\n");
}
-void init_font(Font *font, FT_Face face, unsigned first, unsigned last, int autohinter)
+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;
+}
+
+void *alloc_image_data(size_t a, size_t b)
+{
+ void *ptr;
+
+ /* Carry out the multiplication manually so we can check for overflow. */
+ while(b>1)
+ {
+ size_t c = a;
+ a *= 2;
+ if(b&1)
+ a += c;
+ if(a<c)
+ {
+ fprintf(stderr, "Cannot allocate %lu kbytes of memory for image\n", (unsigned long)(c/1024*b));
+ return NULL;
+ }
+ b /= 2;
+ }
+ ptr = malloc(a);
+ if(!ptr)
+ fprintf(stderr, "Cannot allocate %lu kbytes of memory for image\n", (unsigned long)(a/1024*b));
+ return ptr;
+}
+
+int init_font(Font *font, FT_Face face, unsigned first, unsigned last, int autohinter)
{
unsigned i, j;
unsigned size = 0;
{
unsigned n;
FT_Bitmap *bmp = &face->glyph->bitmap;
- int x, y;
+ unsigned x, y;
int flags = 0;
Glyph *glyph;
glyph->image.w = bmp->width;
glyph->image.h = bmp->rows;
glyph->image.data = (char *)malloc(bmp->width*bmp->rows);
+ if(!glyph->image.data)
+ {
+ fprintf(stderr, "Cannot allocate %d bytes of memory for glyph\n", bmp->width*bmp->rows);
+ return -1;
+ }
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;
/* 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 */
+ start from the bottom. */
if(bmp->pitch<0)
{
for(y=0; y<bmp->rows; ++y) for(x=0; x<bmp->width; ++x)
if(verbose>=1)
printf("Loaded %d kerning pairs\n", font->n_kerning);
+
+ return 0;
}
-void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int seq)
+int render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int seq)
{
unsigned i;
int top = 0, bot = 0;
last = font->glyphs[font->n_glyphs-1].code;
font->image.w = round_to_pot(cpl*cellw);
- font->image.h = round_to_pot((last-first+cpl)/cpl*cellh);
+ if(seq)
+ font->image.h = round_to_pot((font->n_glyphs+cpl-1)/cpl*cellh);
+ else
+ font->image.h = round_to_pot((last-first+cpl)/cpl*cellh);
- font->image.data = (char *)malloc(font->image.w*font->image.h);
+ font->image.data = (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);
for(i=0; i<font->n_glyphs; ++i)
font->image.data[cx+x+(cy+y)*font->image.w] = 255-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;
+ size_t area = 0;
char *used_glyphs;
unsigned *used_pixels;
- unsigned cx = 0, cy;
+ 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 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;
+ if(font->image.w<=margin*2)
+ continue;
+ font->image.h = (area*5/4)/(font->image.w-margin*2)+margin*2;
if(font->image.h<=font->image.w)
break;
}
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);
+ font->image.data = (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);
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);
- for(cy=0; cy<font->image.h;)
+ for(cy=margin; cy+margin<font->image.h;)
{
unsigned w;
unsigned x, y;
/* 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+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>=font->image.w)
+ if(cx+margin>=font->image.w)
{
- cx = 0;
+ cx = margin;
++cy;
continue;
}
/* Count the free pixel at this position. */
- for(w=0; (cx+w<font->image.w && used_pixels[cx+w]<=cy); ++w) ;
+ 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)
/* 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;
+ score = g->image.h+padding;
if(g->image.h==target_h)
score *= g->image.w;
else
continue;
font->image.data[cx+x+(cy+y)*font->image.w] = 255-glyph->image.data[x+y*glyph->image.w];
}
- 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)
+ if(cx+x<padding || cx+x>=font->image.w+padding)
continue;
- if(used_pixels[cx+x-1]<cy+glyph->image.h+1)
- used_pixels[cx+x-1] = cy+glyph->image.h+1;
+ 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>used_h)
- used_h = cy+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 = round_to_pot(used_h);
+
+ free(used_glyphs);
+ free(used_pixels);
+
+ return 0;
}
int save_defs(const char *fn, const Font *font)
png_info *pngi;
png_byte **rows;
unsigned i;
- png_byte *data2;
+ png_byte *data2 = 0;
int color;
if(!strcmp(fn, "-"))
rows = (png_byte **)malloc(image->h*sizeof(png_byte *));
if(alpha)
{
- data2 = (png_byte *)malloc(image->w*image->h*2);
+ data2 = (png_byte *)alloc_image_data(image->w*2, image->h);
+ if(!data2)
+ return -1;
for(i=0; i<image->w*image->h; ++i)
{
data2[i*2] = 255;