Commit df4f9147 authored by Philip Gladstone's avatar Philip Gladstone
Browse files

Initial checkin for a cheaper text drawing function than imlib2.c.

Originally committed as revision 1577 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent b90a6beb
/*
* drawtext.c: print text over the screen
******************************************************************
* Options:
* -f <filename> font filename
* -s <pixel_size> font size in pixels
* -b print background
* -o outline glyphs (use the bg color)
* -x <pos> x position ( > 0)
* -y <pos> y position ( > 0)
* -t <text> text to print (will be passed to strftime())
* -c <#RRGGBB> foreground color ('internet' way)
* -C <#RRGGBB> background color ('internet' way)
*
******************************************************************
*
* Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <time.h>
#include "framehook.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#define RGB_TO_YUV(rgb_color, yuv_color) { \
yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) + 16; \
yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \
yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \
}
#define COPY_3(dst,src) { \
dst[0]=src[0]; \
dst[1]=src[1]; \
dst[2]=src[2]; \
}
#define SET_PIXEL(picture, yuv_color, x, y) { \
picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
}
#define GET_PIXEL(picture, yuv_color, x, y) { \
yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
}
typedef struct {
char *text;
unsigned int x;
unsigned int y;
int bg;
int outline;
unsigned char bgcolor[3]; /* YUV */
unsigned char fgcolor[3]; /* YUV */
FT_Library ft_lib;
FT_Face ft_face;
} ContextInfo;
void Release(void *ctx)
{
if (ctx)
av_free(ctx);
}
int ParseColor(char *text, unsigned char yuv_color[3])
{
char tmp[3];
unsigned char rgb_color[3];
int i;
tmp[2] = '\0';
if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
return -1;
for (i=0; i < 3; i++)
{
tmp[0] = text[i*2+1];
tmp[1] = text[i*2+2];
rgb_color[i] = strtol(tmp, NULL, 16);
}
RGB_TO_YUV(rgb_color, yuv_color);
printf("RGB=%d,%d,%d YUV=%d,%d,%d\n",rgb_color[0],rgb_color[1],rgb_color[2],
yuv_color[0],yuv_color[1],yuv_color[2]);
return 0;
}
int Configure(void **ctxp, int argc, char *argv[])
{
int c;
int error;
ContextInfo *ci=NULL;
char *font=NULL;
unsigned int size=16;
*ctxp = av_mallocz(sizeof(ContextInfo));
ci = (ContextInfo *) *ctxp;
/* configure Context Info */
ci->text = NULL;
ci->x = ci->y = 0;
ci->fgcolor[0]=255;
ci->fgcolor[1]=128;
ci->fgcolor[2]=128;
ci->bgcolor[0]=0;
ci->fgcolor[1]=128;
ci->fgcolor[2]=128;
ci->bg = 0;
ci->outline = 0;
optind = 0;
while ((c = getopt(argc, argv, "f:t:x:y:s:c:C:bo")) > 0) {
switch (c) {
case 'f':
font = optarg;
break;
case 't':
ci->text = av_strdup(optarg);
break;
case 'x':
ci->x = (unsigned int) atoi(optarg);
break;
case 'y':
ci->y = (unsigned int) atoi(optarg);
break;
case 's':
size = (unsigned int) atoi(optarg);
break;
case 'c':
if (ParseColor(optarg, ci->fgcolor) == -1)
{
fprintf(stderr, "ERROR: Invalid foreground color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -c #ffffff (for white foreground)\n",optarg);
return -1;
}
break;
case 'C':
if (ParseColor(optarg, ci->bgcolor) == -1)
{
fprintf(stderr, "ERROR: Invalid foreground color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -c #ffffff (for white foreground)\n",optarg);
return -1;
}
break;
case 'b':
ci->bg=1;
break;
case 'o':
ci->outline=1;
break;
case '?':
fprintf(stderr, "ERROR: Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
if (!ci->text)
{
fprintf(stderr,"ERROR: No text provided (-t text)\n");
return -1;
}
if (!font)
{
fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
return -1;
}
if ((error = FT_Init_FreeType(&(ci->ft_lib))) != 0)
{
fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
return -1;
}
if ((error = FT_New_Face( ci->ft_lib, font, 0, &(ci->ft_face) )) != 0)
{
fprintf(stderr,"ERROR: Could not load face: %s (error# %d)\n",font, error);
return -1;
}
if ((error = FT_Set_Pixel_Sizes( ci->ft_face, 0, size)) != 0)
{
fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
return -1;
}
return 0;
}
inline void draw_glyph(AVPicture *picture, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_fgcolor[3], unsigned char yuv_bgcolor[3], int outline)
{
int r, c;
int spixel, dpixel[3], in_glyph=0;
if (bitmap->pixel_mode == ft_pixel_mode_mono)
{
in_glyph = 0;
for (r=0; (r < bitmap->rows) && (r+y < height); r++)
{
for (c=0; (c < bitmap->width) && (c+x < width); c++)
{
/* pixel in the picture (destination) */
GET_PIXEL(picture, dpixel, (c+x), (y+r));
/* pixel in the glyph bitmap (source) */
spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8));
if (spixel)
COPY_3(dpixel, yuv_fgcolor);
if (outline)
{
/* border detection: */
if ( (!in_glyph) && (spixel) )
/* left border detected */
{
in_glyph = 1;
/* draw left pixel border */
if (c-1 >= 0)
SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
}
else if ( (in_glyph) && (!spixel) )
/* right border detected */
{
in_glyph = 0;
/* 'draw' right pixel border */
COPY_3(dpixel, yuv_bgcolor);
}
else if (in_glyph)
/* see if we have a top/bottom border */
{
/* top */
if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
/* we have a top border */
SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
/* bottom */
if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
/* we have a bottom border */
SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
}
}
SET_PIXEL(picture, dpixel, (c+x), (y+r));
}
}
}
}
void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
FT_Face face = ci->ft_face;
FT_GlyphSlot slot = face->glyph;
char *text = ci->text;
int x = 0, y = 0, i=0, j=0, size=0, error;
int str_w, str_h;
char buff[1000];
time_t now = time(0);
strftime(buff, sizeof(buff), text, localtime(&now));
text = buff;
size = strlen(text);
x = ci->x;
y = ci->y;
/* measure string size */
str_w = str_h = 0;
for (i=0; i < size; i++)
{
/* load glyph image into the slot (erase previous one) */
error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
if (error) continue; /* ignore errors */
str_w += slot->advance.x >> 6;
if (slot->bitmap_top > str_h)
str_h = slot->bitmap_top;
}
if (ci->bg)
/* draw background */
for (j = 0; (j < str_h) && (j+y < height); j++)
for (i = 0; (i < str_w) && (i+x < width); i++)
{
SET_PIXEL(picture, ci->bgcolor, (i+x), (y+j));
}
/* Draw Glyphs */
for (i=0; i < size; i++)
{
/* load glyph image into the slot (erase previous one) */
error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
if (error) continue; /* ignore errors */
if (text[i] != '_') /* skip '_' (consider as space) */
/* now, draw to our target surface */
draw_glyph( picture, &slot->bitmap,
x + slot->bitmap_left,
y - slot->bitmap_top + str_h,
width, height,
ci->fgcolor, ci->bgcolor,
ci->outline);
/* increment pen position */
x += slot->advance.x >> 6;
}
}
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