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Add shadow support to the drawtext filter 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-02-22 01:41:52 +01:00
parent a64a2c5f98
commit f9c61974ae
1 changed files with 31 additions and 6 deletions
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37
libavfilter/vf_drawtext.c
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@ -59,13 +59,17 @@ typedef struct {
char *textfile; ///< file with text to be drawn
unsigned int x; ///< x position to start drawing text
unsigned int y; ///< y position to start drawing text
int shadowx, shadowy;
unsigned int fontsize; ///< font size to use
char *fontcolor_string; ///< font color as string
char *boxcolor_string; ///< box color as string
char *shadowcolor_string; ///< shadow color as string
uint8_t fontcolor[4]; ///< foreground color
uint8_t boxcolor[4]; ///< background color
uint8_t shadowcolor[4]; ///< shadow color
uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
uint8_t boxcolor_rgba[4]; ///< background color in RGBA
uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA
short int draw_box; ///< draw box around text - true or false
int use_kerning; ///< font kerning is used - true/false
@ -89,10 +93,13 @@ static const AVOption drawtext_options[]= {
{"textfile", "set text file", OFFSET(textfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
{"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
{"boxcolor", "set box color", OFFSET(boxcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
{"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
{"box", "set box", OFFSET(draw_box), FF_OPT_TYPE_INT, 0, 0, 1 },
{"fontsize", "set font size", OFFSET(fontsize), FF_OPT_TYPE_INT, 16, 1, 72 },
{"x", "set x", OFFSET(x), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
{"y", "set y", OFFSET(y), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
{"shadowx", "set x", OFFSET(shadowx), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
{"shadowy", "set y", OFFSET(shadowy), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
{"tabsize", "set tab size", OFFSET(tabsize), FF_OPT_TYPE_INT, 4, 0, INT_MAX },
/* FT_LOAD_* flags */
@ -205,6 +212,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
av_opt_set_defaults2(dtext, 0, 0);
dtext->fontcolor_string = av_strdup("black");
dtext->boxcolor_string = av_strdup("white");
dtext->shadowcolor_string = av_strdup("black");
if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
@ -257,6 +265,12 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
return err;
}
if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
av_log(ctx, AV_LOG_ERROR,
"Invalid shadow color '%s'\n", dtext->shadowcolor_string);
return err;
}
if ((err = FT_Init_FreeType(&(dtext->library)))) {
av_log(ctx, AV_LOG_ERROR,
"Could not load FreeType: %s\n", FT_ERRMSG(err));
@ -324,6 +338,7 @@ static av_cold void uninit(AVFilterContext *ctx)
av_freep(&dtext->text);
av_freep(&dtext->fontcolor_string);
av_freep(&dtext->boxcolor_string);
av_freep(&dtext->shadowcolor_string);
av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
av_tree_destroy(dtext->glyphs);
dtext->glyphs = 0;
@ -359,6 +374,11 @@ static int config_input(AVFilterLink *inlink)
dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
dtext->fontcolor[3] = rgba[3];
rgba = dtext->shadowcolor_rgba;
dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
dtext->shadowcolor[3] = rgba[3];
}
return 0;
@ -476,7 +496,7 @@ static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned i
}
static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
int width, int height)
int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
{
char *text = dtext->text;
uint32_t code = 0;
@ -501,12 +521,12 @@ static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
if (dtext->is_packed_rgb) {
draw_glyph_rgb(picref, &glyph->bitmap,
dtext->positions[i].x, dtext->positions[i].y, width, height,
dtext->pixel_step[0], dtext->fontcolor_rgba, dtext->rgba_map);
dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
} else {
draw_glyph_yuv(picref, &glyph->bitmap,
dtext->positions[i].x, dtext->positions[i].y, width, height,
dtext->fontcolor, dtext->hsub, dtext->vsub);
dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
yuvcolor, dtext->hsub, dtext->vsub);
}
}
@ -621,7 +641,12 @@ static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
}
if((ret=draw_glyphs(dtext, picref, width, height))<0)
if(dtext->shadowx || dtext->shadowy){
if((ret=draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba, dtext->shadowcolor, dtext->shadowx, dtext->shadowy))<0)
return ret;
}
if((ret=draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba, dtext->fontcolor, 0, 0))<0)
return ret;
return 0;