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mirror of https://github.com/mpv-player/mpv synced 2024-11-14 22:48:35 +01:00

Implemented new Gaussian blur algorithm, extended font.desc format, optimized for speed and memory usage.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1608 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
zybi 2001-08-21 14:00:57 +00:00
parent 61d8e6ee1e
commit 173cbc1e8f
4 changed files with 240 additions and 151 deletions

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@ -1,16 +1,19 @@
include ../../config.mak
LDLIBS=-lm $(shell freetype-config --libs)
CFLAGS=$(OPTFLAGS) $(shell freetype-config --cflags)
#CFLAGS+=-DOLD_FREETYPE2
#CFLAGS+=-O0 # for RedHat's gcc-2.96-95
#CFLAGS+=-DOLD_FREETYPE2 # for FreeType 2.0.1
#CFLAGS+=-g
#CFLAGS+=-DDEBUG
#CFLAGS+=-DNEW_DESC
subfont: subfont.o
subfont.o: subfont.c Makefile
subfont.S: subfont.c
$(CC) $(CFLAGS) -S $^ -o $@

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@ -2,10 +2,11 @@ Usage:
~~~~~~
1. Make sure you have FreeType 2 installed.
2. Get a TrueType or Type 1 font.
3. Modify `runme' script for your encoding and font path.
4. Type: ./runme
5. Copy *.raw and font.desc files to ~/.mplayer/font/
6. Run subfont alone to see more options.
3. Run ./configure from mplayer's root directory.
4. Modify `runme' script for your encoding and font path.
5. Type: ./runme
6. Copy *.raw and font.desc files to ~/.mplayer/font/
7. Run subfont alone to see more options.
About:
@ -28,7 +29,7 @@ I found on http://rpmfind.net/ and euc-kr encoding. Custom encoding file
for euc-kr was generated from charmap I found in /usr/share/i18n/charmaps/EUC-KR.gz
(glibc package). This should work with -unicode switch for mplayer
(though it is not Unicode encoding).
It took about 14 seconds to render over 8000 characters on P3 @ 600MHz.
It took about 10 seconds to render over 8000 characters on P3 @ 600MHz.
Custom encodings:
@ -45,6 +46,34 @@ of a sigle line:
0105 B1
New font.desc format (proposal):
~~~~~~~~~~~~~~~~~~~~~==========~
Subfont will generate new font.desc format when compiled with NEW_DESC macro defined
(uncomment appropriate line in Makefile).
These changes are to make bitmaps smaller and processing faster.
Changes to [info] section:
There is no `spacewidth'. It will not be useful.
`height` is the distance from one baseline to the next.
`ascender' is the distance from the baseline to the highest grid coordinate used to place the outline point.
`descender' is the distance from the baseline to the lowest grid coordinate used to place the outline point.
Note: upwards direction is positive.
Read more: freetype-2.*/docs/glyphs/glyphs-3.html
Changes to [characters] section:
Bitmap start and bitmap end are replaced with:
bitmap start,
bitmap width,
bitmap height,
left bearing -- the horizontal distance from the current pen position to the bitmaps's left edge,
top bearing -- the vertical distance from the baseline to the bitmaps's top edge,
advance -- the horizontal distance the pen position must be incremented by after each glyph is rendered.
To anderstand this you must think in verctorial coordinates.
Necessarily read freetype-2.*/docs/glyphs/glyphs-7.html about vectorial coordinates!
Notes:
~~~~~~
+ Starting x position of each character and the bitmap width is aligned

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@ -1,6 +1,7 @@
#!/bin/bash
font=arial.ttf
#font=verdana.ttf
encoding=iso-8859-2
fontsize=24
symbolssize=35
@ -9,18 +10,15 @@ outline=1.5
make || exit
./subfont --blur $blur --outline $outline "$encoding" $fontsize "$font" &>log
status=$?
cat log
[ $status == 0 ] || exit
./subfont --blur $blur --outline $outline "$encoding" $fontsize "$font" || exit
./subfont --append --blur $blur --outline $outline encodings/osd-mplayer $symbolssize osd/osd.pfb || exit
#cp font.desc *.raw ~/.mplayer/font/
exit
SIZE=`awk '/^bitmap size/ {print $NF}' log`+800
# display *.raw files
SIZE=`awk '/bitmap size:/ {print $NF; exit}' font.desc`+800
display -size $SIZE gray:$encoding-a.raw &
display -size $SIZE gray:$encoding-b.raw &
#convert -size $SIZE gray:$encoding-a.raw $encoding-a.png

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@ -1,10 +1,7 @@
/*
* Renders antialiased fonts for mplayer using freetype library.
* Should work with TrueType, Type1 and any other font supported by libfreetype.
*
* Goals:
* - internationalization: supports any 8 bit encoding (uses iconv).
* - nice look: creates glyph `shadows' using algorithm derived from gaussian blur.
* Can generate font.desc for any encoding.
*
*
* Artur Zaprzala <zybi@fanthom.irc.pl>
@ -66,7 +63,7 @@ char *font_path;
//char *font_metrics;
int append_mode = 0;
unsigned char *buffer, *abuffer;
unsigned char *bbuffer, *abuffer;
int width, height;
static FT_ULong charset[max_charset_size]; /* characters we want to render; Unicode */
static FT_ULong charcodes[max_charset_size]; /* character codes in 'encoding' */
@ -80,9 +77,14 @@ iconv_t cd; // iconv conversion descriptor
#define ERROR(...) ERROR_(__VA_ARGS__, NULL)
#define WARNING(...) WARNING_(__VA_ARGS__, NULL)
#define f266toInt(x) (((x)+32)>>6) // round fractional fixed point number to integer
#define f266ToInt(x) (((x)+32)>>6) // round fractional fixed point number to integer
// coordinates are in 26.6 pixels (i.e. 1/64th of pixels)
#define ALIGN(x) (((x)+7)&~7) // 8 byte align
#define f266CeilToInt(x) (((x)+63)>>6) // ceiling
#define f266FloorToInt(x) ((x)>>6) // floor
#define f1616ToInt(x) (((x)+0x8000)>>16) // 16.16
#define ALIGN(x) (((x)+7)&~7) // 8 byte align
@ -93,11 +95,11 @@ void paste_bitmap(FT_Bitmap *bitmap, int x, int y) {
if (bitmap->pixel_mode==ft_pixel_mode_mono)
for (h = bitmap->rows; h>0; --h, drow+=width, srow+=bitmap->pitch)
for (w = bitmap->width, sp=dp=0; w>0; --w, ++dp, ++sp)
buffer[drow+dp] = (bitmap->buffer[srow+sp/8] & (0x80>>(sp%8))) ? 255:0;
bbuffer[drow+dp] = (bitmap->buffer[srow+sp/8] & (0x80>>(sp%8))) ? 255:0;
else
for (h = bitmap->rows; h>0; --h, drow+=width, srow+=bitmap->pitch)
for (w = bitmap->width, sp=dp=0; w>0; --w, ++dp, ++sp)
buffer[drow+dp] = bitmap->buffer[srow+sp];
bbuffer[drow+dp] = bitmap->buffer[srow+sp];
}
@ -113,24 +115,17 @@ void write_header(FILE *f) {
}
void write_bitmap() {
void write_bitmap(void *buffer, char type) {
FILE *f;
int const max_name = 128;
char name[max_name];
snprintf(name, max_name, "%s-b.raw", encoding_name);
snprintf(name, max_name, "%s-%c.raw", encoding_name, type);
f = fopen(name, "wb");
if (f==NULL) ERROR("fopen failed.");
write_header(f);
fwrite(buffer, 1, width*height, f);
fclose(f);
snprintf(name, max_name, "%s-a.raw", encoding_name);
f = fopen(name, "wb");
if (f==NULL) ERROR("fopen failed.");
write_header(f);
fwrite(abuffer, 1, width*height, f);
fclose(f);
}
@ -138,27 +133,27 @@ void render() {
FT_Library library;
FT_Face face;
FT_Error error;
FT_GlyphSlot slot;
FT_ULong glyph_index, character, code;
//FT_Glyph glyphs[max_charset_size];
FT_Glyph glyph;
FT_Glyph *glyphs;
FT_BitmapGlyph glyph;
FILE *f;
int const load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;
int pen_x, pen_xa, pen_y, ymin, ymax;
int pen_x = 0, pen_xa;
int ymin = INT_MAX, ymax = INT_MIN;
int i, uni_charmap = 1;
int baseline, space_advance = 20;
int glyphs_count = 0;
/* initialize freetype */
error = FT_Init_FreeType(&library);
if (error) ERROR("Init_FreeType failed.");
error = FT_New_Face(library, font_path, 0, &face);
if (error) ERROR("New_Face failed.");
if (error) ERROR("New_Face failed. Maybe the font path `%s' is wrong.", font_path);
/*
if (font_metrics) {
error = FT_Attach_File(face, font_metrics);
if (error) WARNING("Attach_File failed.");
if (error) WARNING("FT_Attach_File failed.");
}
*/
@ -173,8 +168,10 @@ void render() {
//error = FT_Select_Charmap(face, ft_encoding_adobe_standard);
//error = FT_Select_Charmap(face, ft_encoding_adobe_custom);
//error = FT_Set_Charmap(face, face->charmaps[1]);
//if (error) WARNING("Select_Charmap failed.");
//if (error) WARNING("FT_Select_Charmap failed.");
#endif
#if 0
/************************************************************/
if (FT_HAS_GLYPH_NAMES(face)) {
@ -214,7 +211,7 @@ void render() {
WARNING("Selected font is not scalable. Using ppem=%i.", face->available_sizes[j].height);
error = FT_Set_Pixel_Sizes(face, face->available_sizes[j].width, face->available_sizes[j].height);
}
if (error) WARNING("Set_Pixel_Sizes failed.");
if (error) WARNING("FT_Set_Pixel_Sizes failed.");
if (FT_IS_FIXED_WIDTH(face))
@ -224,13 +221,14 @@ void render() {
/* compute space advance */
error = FT_Load_Char(face, ' ', load_flags);
if (error) WARNING("spacewidth set to default.");
else space_advance = f266toInt(face->glyph->advance.x);
else space_advance = f266ToInt(face->glyph->advance.x);
/* create font.desc */
f = fopen(font_desc, append_mode ? "a":"w");
if (f==NULL) ERROR("fopen failed.");
/* print font.desc header */
if (append_mode) {
fprintf(f, "\n\n# Subtitle font for %s encoding, face \"%s%s%s\", ppem=%i\n",
@ -246,10 +244,20 @@ void render() {
face->family_name,
face->style_name ? " ":"", face->style_name ? face->style_name:"",
ppem);
#ifdef NEW_DESC
fprintf(f, "descversion 2\n");
#else
fprintf(f, "descversion 1\n");
#endif
fprintf(f, "spacewidth %i\n", 2*padding + space_advance);
#ifndef NEW_DESC
fprintf(f, "charspace %i\n", -2*padding);
fprintf(f, "height %i\n", f266toInt(face->size->metrics.height));
#endif
fprintf(f, "height %i\n", f266ToInt(face->size->metrics.height));
#ifdef NEW_DESC
fprintf(f, "ascender %i\n", f266CeilToInt(face->size->metrics.ascender));
fprintf(f, "descender %i\n", f266FloorToInt(face->size->metrics.descender));
#endif
}
fprintf(f, "\n[files]\n");
fprintf(f, "alpha %s-a.raw\n", encoding_name);
@ -257,17 +265,18 @@ void render() {
fprintf(f, "\n[characters]\n");
/* compute bbox and [characters] section*/
pen_x = 0;
pen_y = 0;
ymin = INT_MAX;
ymax = INT_MIN;
// render glyphs, compute bitmap size and [characters] section
glyphs = (FT_Glyph*)malloc(charset_size*sizeof(FT_Glyph*));
for (i= 0; i<charset_size; ++i) {
FT_UInt glyph_index;
FT_BBox bbox;
FT_GlyphSlot slot;
FT_ULong character, code;
FT_UInt glyph_index;
FT_BBox bbox;
character = charset[i];
code = charcodes[i];
// get glyph index
if (character==0)
glyph_index = 0;
else {
@ -279,93 +288,116 @@ void render() {
}
}
// load glyph
error = FT_Load_Glyph(face, glyph_index, load_flags);
if (error) {
WARNING("Load_Glyph 0x%02x (char 0x%02x|U+%04X) failed.", glyph_index, code, character);
WARNING("FT_Load_Glyph 0x%02x (char 0x%02x|U+%04X) failed.", glyph_index, code, character);
continue;
}
slot = face->glyph;
error = FT_Get_Glyph(slot, &glyph);
FT_Glyph_Get_CBox(glyph, ft_glyph_bbox_pixels, &bbox);
if (pen_y+bbox.yMax>ymax) {
ymax = pen_y+bbox.yMax;
// eprintf("%3i: ymax %i (%c)\n", code, ymax, code);
// render glyph
if (slot->format != ft_glyph_format_bitmap) {
error = FT_Render_Glyph(slot, ft_render_mode_normal);
if (error) {
WARNING("FT_Render_Glyph 0x%04x (char 0x%02x|U+%04X) failed.", glyph_index, code, character);
continue;
}
}
if (pen_y+bbox.yMin<ymin) {
ymin = pen_y+bbox.yMin;
// eprintf("%3i: ymin %i (%c)\n", code, ymin, code);
// extract glyph image
error = FT_Get_Glyph(slot, (FT_Glyph*)&glyph);
if (error) {
WARNING("FT_Get_Glyph 0x%04x (char 0x%02x|U+%04X) failed.", glyph_index, code, character);
continue;
}
glyphs[glyphs_count++] = (FT_Glyph)glyph;
#ifdef NEW_DESC
// max height
if (glyph->bitmap.rows > height) height = glyph->bitmap.rows;
// advance pen
pen_xa = pen_x + glyph->bitmap.width + 2*padding;
// font.desc
fprintf(f, "0x%02x %i %i %i %i %i %i;\tU+%04X|%c\n", code,
pen_x, // bitmap start
glyph->bitmap.width + 2*padding, // bitmap width
glyph->bitmap.rows + 2*padding, // bitmap height
glyph->left - padding, // left bearing
glyph->top + padding, // top bearing
f266ToInt(slot->advance.x), // advance
character, code<' '||code>255 ? '.':code);
#else
// max height
if (glyph->top > ymax) {
ymax = glyph->top;
//eprintf("%3i: ymax %i (%c)\n", code, ymax, code);
}
if (glyph->top - glyph->bitmap.rows < ymin) {
ymin = glyph->top - glyph->bitmap.rows;
//eprintf("%3i: ymin %i (%c)\n", code, ymin, code);
}
/* advance pen */
pen_xa = pen_x + f266toInt(slot->advance.x) + 2*padding;
// pen_y += f266toInt(slot->advance.y); // for vertical layout
pen_xa = pen_x + f266ToInt(slot->advance.x) + 2*padding;
/* font.desc */
fprintf(f, "0x%02x %i %i;\tU+%04X|%c\n", code, pen_x, pen_xa-1, character, code<' '||code>255 ? '.':code);
#endif
pen_x = ALIGN(pen_xa);
}
fclose(f);
if (ymax<=ymin) ERROR("Something went wrong. Use the source!");
width = pen_x;
pen_x = 0;
#ifdef NEW_DESC
if (height<=0) ERROR("Something went wrong. Use the source!");
height += 2*padding;
#else
if (ymax<=ymin) ERROR("Something went wrong. Use the source!");
height = ymax - ymin + 2*padding;
baseline = ymax + padding;
eprintf("bitmap size: %ix%i\n", width, height);
#endif
buffer = (unsigned char*)malloc(width*height);
abuffer = (unsigned char*)malloc(width*height);
if (buffer==NULL || abuffer==NULL) ERROR("malloc failed.");
// end of font.desc
if (DEBUG) eprintf("bitmap size: %ix%i\n", width, height);
fprintf(f, "# bitmap size: %ix%i\n", width, height);
fclose(f);
memset(buffer, 0, width*height);
bbuffer = (unsigned char*)malloc(width*height);
if (bbuffer==NULL) ERROR("malloc failed.");
memset(bbuffer, 0, width*height);
/* render glyphs */
pen_x = 0;
pen_y = baseline;
for (i= 0; i<charset_size; ++i) {
FT_UInt glyph_index;
character = charset[i];
code = charcodes[i];
if (character==0)
glyph_index = 0;
else {
glyph_index = FT_Get_Char_Index(face, uni_charmap ? character:code);
if (glyph_index==0)
continue;
}
error = FT_Load_Glyph(face, glyph_index, load_flags);
if (error) {
// WARNING("Load_Glyph failed.");
continue;
}
error = FT_Render_Glyph(face->glyph, ft_render_mode_normal);
if (error) WARNING("Render_Glyph 0x%02x (char 0x%02x|U+%04X) failed.", glyph_index, code, character);
slot = face->glyph;
paste_bitmap(&slot->bitmap,
pen_x + padding + slot->bitmap_left,
pen_y - slot->bitmap_top );
/* paste glyphs */
for (i= 0; i<glyphs_count; ++i) {
glyph = (FT_BitmapGlyph)glyphs[i];
#ifdef NEW_DESC
paste_bitmap(&glyph->bitmap,
pen_x + padding,
padding);
/* advance pen */
pen_x += f266toInt(slot->advance.x) + 2*padding;
// pen_y += f266toInt(slot->advance.y); // for vertical layout
pen_x += glyph->bitmap.width + 2*padding;
#else
paste_bitmap(&glyph->bitmap,
pen_x + padding + glyph->left,
baseline - glyph->top);
/* advance pen */
pen_x += f1616ToInt(glyph->root.advance.x) + 2*padding;
#endif
pen_x = ALIGN(pen_x);
FT_Done_Glyph((FT_Glyph)glyph);
}
free(glyphs);
error = FT_Done_FreeType(library);
if (error) ERROR("Done_FreeType failed.");
if (error) ERROR("FT_Done_FreeType failed.");
}
@ -512,10 +544,10 @@ void outline1(
}
// brute-force gaussian blur
// gaussian blur
void blur(
unsigned char *s,
unsigned char *t,
unsigned char *buffer,
unsigned char *tmp,
int width,
int height,
int *m,
@ -525,30 +557,60 @@ void blur(
int x, y;
unsigned char *s = buffer - r;
unsigned char *t = tmp;
for (y = 0; y<height; ++y) {
for (x = 0; x<width; ++x, ++s, ++t) {
unsigned sum = 0;
unsigned *mrow = m + r;
unsigned char *srow = s -r*width;
int x1=(x<r)?-x:-r;
int x2=(x+r>=width)?(width-x-1):r;
int x1 = (x<r) ? r-x:0;
int x2 = (x+r>=width) ? (r+width-x):mwidth;
int mx;
for (mx = x1; mx<x2; ++mx)
sum+= s[mx] * m[mx];
*t = (sum + volume/2) / volume;
//*t = sum;
}
}
tmp -= r*width;
for (x = 0; x<width; ++x, ++tmp, ++buffer) {
s = tmp;
t = buffer;
for (y = 0; y<height; ++y, s+= width, t+= width) {
unsigned sum = 0;
int y1 = (y<r) ? r-y:0;
int y2 = (y+r>=height) ? (r+height-y):mwidth;
unsigned char *smy = s + y1*width;
int my;
for (my = -r; my<=r; ++my, srow+= width, mrow+= mwidth) {
int mx;
if (y+my < 0) continue;
if (y+my >= height) break;
for (mx = x1; mx<=x2; ++mx)
sum+= srow[mx] * mrow[mx];
}
for (my = y1; my<y2; ++my, smy+= width)
sum+= *smy * m[my];
*t = (sum + volume/2) / volume;
}
}
}
// Gaussian matrix
// Maybe for future use.
unsigned gmatrix(unsigned *m, int r, int w, double const A) {
unsigned volume = 0; // volume under Gaussian area is exactly -pi*base/A
int mx, my;
for (my = 0; my<w; ++my) {
for (mx = 0; mx<w; ++mx) {
m[mx+my*w] = (unsigned)(exp(A * ((mx-r)*(mx-r)+(my-r)*(my-r))) * base + .5);
volume+= m[mx+my*w];
if (DEBUG) eprintf("%3i ", m[mx+my*w]);
}
if (DEBUG) eprintf("\n");
}
if (DEBUG) {
eprintf("A= %f\n", A);
eprintf("volume: %i; exact: %.0f; volume/exact: %.6f\n\n", volume, -M_PI*base/A, volume/(-M_PI*base/A));
}
return volume;
}
void alpha() {
int const g_r = ceil(radius);
int const o_r = ceil(thickness);
@ -556,29 +618,21 @@ void alpha() {
int const o_w = 2*o_r+1; // matrix size
double const A = log(1.0/base)/(radius*radius*2);
int mx, my;
int mx, my, i;
unsigned volume = 0; // volume under Gaussian area is exactly -pi*base/A
unsigned *gm = (unsigned*)malloc(g_w*g_w * sizeof(unsigned));
unsigned *g = (unsigned*)malloc(g_w * sizeof(unsigned));
unsigned *om = (unsigned*)malloc(o_w*o_w * sizeof(unsigned));
unsigned char *tbuffer = (unsigned char*)malloc(width*height);
if (gm==NULL || om==NULL || tbuffer==NULL) ERROR("malloc failed.");
if (g==NULL || om==NULL) ERROR("malloc failed.");
/* Gaussian matrix */
for (my = 0; my<g_w; ++my) {
for (mx = 0; mx<g_w; ++mx) {
gm[mx+my*g_w] = (unsigned)(exp(A * ((mx-g_r)*(mx-g_r)+(my-g_r)*(my-g_r))) * base + .5);
volume+= gm[mx+my*g_w];
if (DEBUG) eprintf("%3i ", gm[mx+my*g_w]);
}
if (DEBUG) eprintf("\n");
// gaussian curve
for (i = 0; i<g_w; ++i) {
g[i] = (unsigned)(exp(A * (i-g_r)*(i-g_r)) * base + .5);
volume+= g[i];
if (DEBUG) eprintf("%3i ", g[i]);
}
if (DEBUG) {
eprintf("A= %f\n", A);
eprintf("volume: %i; exact: %.0f; volume/exact: %.6f\n\n", volume, -M_PI*base/A, volume/(-M_PI*base/A));
}
//volume *= volume;
if (DEBUG) eprintf("\n");
/* outline matrix */
for (my = 0; my<o_w; ++my) {
@ -594,17 +648,16 @@ void alpha() {
if(thickness==1.0)
outline1(buffer, tbuffer, width, height); // FAST solid 1 pixel outline
outline1(bbuffer, abuffer, width, height); // FAST solid 1 pixel outline
else
outline(buffer, tbuffer, width, height, om, o_r, o_w); // solid outline
//outline(buffer, tbuffer, width, height, gm, g_r, g_w); // Gaussian outline
outline(bbuffer, abuffer, width, height, om, o_r, o_w); // solid outline
blur(tbuffer, abuffer, width, height, gm, g_r, g_w, volume);
//outline(bbuffer, abuffer, width, height, gm, g_r, g_w); // Gaussian outline
free(gm);
blur(abuffer, bbuffer, width, height, g, g_r, g_w, volume);
free(g);
free(om);
free(tbuffer);
}
@ -684,14 +737,20 @@ void parse_args(int argc, char **argv) {
int main(int argc, char **argv) {
parse_args(argc, argv);
padding = ceil(radius) + ceil(thickness);
prepare_charset();
render();
alpha();
write_bitmap();
free(buffer);
render();
write_bitmap(bbuffer, 'b');
abuffer = (unsigned char*)malloc(width*height);
if (abuffer==NULL) ERROR("malloc failed.");
alpha();
write_bitmap(abuffer, 'a');
free(bbuffer);
free(abuffer);
// fflush(stderr);