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Anti-Aliased Fonts support.

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This enables Rockbox to render anti-aliased fonts using an alpha blending method.
The input font bitmaps are 4bit, i.e. 4x larger, but the metadata size stays the same.

A tool, convttf, for converting ttf fonts directly to the Rockbox fnt format is provided.
It has a useful help output, but the parameter that works best is -c1 or -c2 (2 for larger font sizes).

Flyspray: FS#8961
Author: Initial work by Jonas Hurrelmann, further work by Fred Bauer, Andrew Mahone, Teruaki Kawashima and myself.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29523 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2011-03-05 18:36:51 +00:00
parent 396ddd9fd7
commit 9edd6d4ee9
11 changed files with 1939 additions and 27 deletions
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15
tools/convbdf.c
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@ -46,6 +46,7 @@ struct font {
int ascent; /* ascent (baseline) height */
int firstchar; /* first character in bitmap */
int size; /* font size in glyphs ('holes' included) */
int depth; /* depth of the font, 0=1bit 1=4bit */
bitmap_t* bits; /* 16-bit right-padded bitmap data */
int* offset; /* offsets into bitmap data */
unsigned char* width; /* character widths or NULL if fixed */
@ -1220,6 +1221,7 @@ int gen_c_source(struct font* pf, char *path)
" size: %d\n"
" ascent: %d\n"
" descent: %d\n"
" depth: %d\n"
" first char: %d (0x%02x)\n"
" last char: %d (0x%02x)\n"
" default char: %d (0x%02x)\n"
@ -1245,7 +1247,7 @@ int gen_c_source(struct font* pf, char *path)
pf->facename? pf->facename: "",
pf->maxwidth, pf->height,
pf->size,
pf->ascent, pf->descent,
pf->ascent, pf->descent, pf->depth,
pf->firstchar, pf->firstchar,
pf->firstchar+pf->size-1, pf->firstchar+pf->size-1,
pf->defaultchar, pf->defaultchar,
@ -1392,6 +1394,7 @@ int gen_c_source(struct font* pf, char *path)
" %d, /* ascent */\n"
" %d, /* firstchar */\n"
" %d, /* size */\n"
" %d, /* depth */\n"
" _font_bits, /* bits */\n"
" %s /* offset */\n"
" %s\n"
@ -1411,7 +1414,7 @@ int gen_c_source(struct font* pf, char *path)
pf->maxwidth, pf->height,
pf->ascent,
pf->firstchar,
pf->size,
pf->size, 0,
obuf,
buf,
pf->defaultchar,
@ -1436,7 +1439,8 @@ int gen_h_header(struct font* pf, char *path)
"#define SYSFONT_WIDTH %d\n"
"#define SYSFONT_HEIGHT %d\n"
"#define SYSFONT_SIZE %d\n"
"#define SYSFONT_ASCENT %d\n";
"#define SYSFONT_ASCENT %d\n"
"#define SYSFONT_DEPTH %d\n";
char *hdr2 =
"#define SYSFONT_DESCENT %d\n"
"#define SYSFONT_FIRST_CHAR %d\n"
@ -1463,7 +1467,8 @@ int gen_h_header(struct font* pf, char *path)
pf->maxwidth,
pf->height,
pf->size,
pf->ascent);
pf->ascent,
pf->depth);
fprintf(ofp, hdr2,
pf->descent,
@ -1546,7 +1551,7 @@ int gen_fnt_file(struct font* pf, char *path)
writeshort(ofp, pf->maxwidth);
writeshort(ofp, pf->height);
writeshort(ofp, pf->ascent);
writeshort(ofp, 0);
writeshort(ofp, 0); /* depth = 0 for bdffonts */
writeint(ofp, pf->firstchar);
writeint(ofp, pf->defaultchar);
writeint(ofp, pf->size);