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

Originally committed as revision 1577 to svn://svn.ffmpeg.org/ffmpeg/trunk

vhook/drawtext.c

+/*
+ * 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;
+    }
+
+
+}
+