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Initial checkin for a cheaper text drawing function than imlib2.c.
Originally committed as revision 1577 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Philip Gladstone
parent
b90a6beb8a
commit
df4f91471c
351
vhook/drawtext.c
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351
vhook/drawtext.c
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/*
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* drawtext.c: print text over the screen
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******************************************************************
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* Options:
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* -f <filename> font filename
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* -s <pixel_size> font size in pixels
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* -b print background
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* -o outline glyphs (use the bg color)
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* -x <pos> x position ( > 0)
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* -y <pos> y position ( > 0)
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* -t <text> text to print (will be passed to strftime())
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* -c <#RRGGBB> foreground color ('internet' way)
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* -C <#RRGGBB> background color ('internet' way)
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*
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******************************************************************
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*
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* Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <time.h>
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#include "framehook.h"
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#define RGB_TO_YUV(rgb_color, yuv_color) { \
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yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) + 16; \
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yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \
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yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \
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}
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#define COPY_3(dst,src) { \
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dst[0]=src[0]; \
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dst[1]=src[1]; \
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dst[2]=src[2]; \
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}
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#define SET_PIXEL(picture, yuv_color, x, y) { \
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picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
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picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
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picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
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}
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#define GET_PIXEL(picture, yuv_color, x, y) { \
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yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
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yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
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yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
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}
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typedef struct {
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char *text;
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unsigned int x;
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unsigned int y;
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int bg;
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int outline;
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unsigned char bgcolor[3]; /* YUV */
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unsigned char fgcolor[3]; /* YUV */
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FT_Library ft_lib;
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FT_Face ft_face;
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} ContextInfo;
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void Release(void *ctx)
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{
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if (ctx)
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av_free(ctx);
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}
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int ParseColor(char *text, unsigned char yuv_color[3])
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{
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char tmp[3];
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unsigned char rgb_color[3];
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int i;
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tmp[2] = '\0';
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if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
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return -1;
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for (i=0; i < 3; i++)
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{
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tmp[0] = text[i*2+1];
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tmp[1] = text[i*2+2];
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rgb_color[i] = strtol(tmp, NULL, 16);
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}
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RGB_TO_YUV(rgb_color, yuv_color);
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printf("RGB=%d,%d,%d YUV=%d,%d,%d\n",rgb_color[0],rgb_color[1],rgb_color[2],
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yuv_color[0],yuv_color[1],yuv_color[2]);
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return 0;
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}
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int Configure(void **ctxp, int argc, char *argv[])
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{
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int c;
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int error;
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ContextInfo *ci=NULL;
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char *font=NULL;
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unsigned int size=16;
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*ctxp = av_mallocz(sizeof(ContextInfo));
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ci = (ContextInfo *) *ctxp;
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/* configure Context Info */
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ci->text = NULL;
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ci->x = ci->y = 0;
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ci->fgcolor[0]=255;
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ci->fgcolor[1]=128;
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ci->fgcolor[2]=128;
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ci->bgcolor[0]=0;
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ci->fgcolor[1]=128;
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ci->fgcolor[2]=128;
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ci->bg = 0;
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ci->outline = 0;
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optind = 0;
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while ((c = getopt(argc, argv, "f:t:x:y:s:c:C:bo")) > 0) {
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switch (c) {
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case 'f':
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font = optarg;
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break;
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case 't':
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ci->text = av_strdup(optarg);
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break;
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case 'x':
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ci->x = (unsigned int) atoi(optarg);
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break;
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case 'y':
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ci->y = (unsigned int) atoi(optarg);
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break;
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case 's':
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size = (unsigned int) atoi(optarg);
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break;
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case 'c':
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if (ParseColor(optarg, ci->fgcolor) == -1)
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{
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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);
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return -1;
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}
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break;
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case 'C':
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if (ParseColor(optarg, ci->bgcolor) == -1)
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{
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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);
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return -1;
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}
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break;
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case 'b':
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ci->bg=1;
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break;
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case 'o':
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ci->outline=1;
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break;
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case '?':
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fprintf(stderr, "ERROR: Unrecognized argument '%s'\n", argv[optind]);
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return -1;
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}
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}
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if (!ci->text)
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{
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fprintf(stderr,"ERROR: No text provided (-t text)\n");
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return -1;
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}
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if (!font)
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{
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fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
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return -1;
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}
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if ((error = FT_Init_FreeType(&(ci->ft_lib))) != 0)
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{
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fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
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return -1;
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}
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if ((error = FT_New_Face( ci->ft_lib, font, 0, &(ci->ft_face) )) != 0)
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{
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fprintf(stderr,"ERROR: Could not load face: %s (error# %d)\n",font, error);
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return -1;
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}
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if ((error = FT_Set_Pixel_Sizes( ci->ft_face, 0, size)) != 0)
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{
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fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
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return -1;
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}
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return 0;
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}
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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)
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{
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int r, c;
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int spixel, dpixel[3], in_glyph=0;
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if (bitmap->pixel_mode == ft_pixel_mode_mono)
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{
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in_glyph = 0;
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for (r=0; (r < bitmap->rows) && (r+y < height); r++)
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{
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for (c=0; (c < bitmap->width) && (c+x < width); c++)
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{
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/* pixel in the picture (destination) */
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GET_PIXEL(picture, dpixel, (c+x), (y+r));
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/* pixel in the glyph bitmap (source) */
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spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8));
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if (spixel)
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COPY_3(dpixel, yuv_fgcolor);
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if (outline)
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{
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/* border detection: */
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if ( (!in_glyph) && (spixel) )
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/* left border detected */
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{
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in_glyph = 1;
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/* draw left pixel border */
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if (c-1 >= 0)
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SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
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}
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else if ( (in_glyph) && (!spixel) )
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/* right border detected */
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{
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in_glyph = 0;
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/* 'draw' right pixel border */
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COPY_3(dpixel, yuv_bgcolor);
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}
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else if (in_glyph)
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/* see if we have a top/bottom border */
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{
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/* top */
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if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
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/* we have a top border */
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SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
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/* bottom */
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if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
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/* we have a bottom border */
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SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
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}
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}
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SET_PIXEL(picture, dpixel, (c+x), (y+r));
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}
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}
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}
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}
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void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
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{
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ContextInfo *ci = (ContextInfo *) ctx;
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FT_Face face = ci->ft_face;
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FT_GlyphSlot slot = face->glyph;
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char *text = ci->text;
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int x = 0, y = 0, i=0, j=0, size=0, error;
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int str_w, str_h;
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char buff[1000];
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time_t now = time(0);
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strftime(buff, sizeof(buff), text, localtime(&now));
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text = buff;
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size = strlen(text);
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x = ci->x;
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y = ci->y;
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/* measure string size */
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str_w = str_h = 0;
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for (i=0; i < size; i++)
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{
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/* load glyph image into the slot (erase previous one) */
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error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
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if (error) continue; /* ignore errors */
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str_w += slot->advance.x >> 6;
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if (slot->bitmap_top > str_h)
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str_h = slot->bitmap_top;
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}
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if (ci->bg)
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/* draw background */
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for (j = 0; (j < str_h) && (j+y < height); j++)
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for (i = 0; (i < str_w) && (i+x < width); i++)
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{
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SET_PIXEL(picture, ci->bgcolor, (i+x), (y+j));
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}
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/* Draw Glyphs */
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for (i=0; i < size; i++)
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{
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/* load glyph image into the slot (erase previous one) */
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error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
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if (error) continue; /* ignore errors */
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if (text[i] != '_') /* skip '_' (consider as space) */
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/* now, draw to our target surface */
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draw_glyph( picture, &slot->bitmap,
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x + slot->bitmap_left,
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y - slot->bitmap_top + str_h,
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width, height,
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ci->fgcolor, ci->bgcolor,
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ci->outline);
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/* increment pen position */
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x += slot->advance.x >> 6;
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}
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}
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