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ffmpeg.wasm-core
Commit c5420f10 authored by Michael Niedermayer's avatar Michael Niedermayer Committed by Anton Khirnov
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drawtext: add shadow support. 

Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
Signed-off-by: 's avatarAnton Khirnov <anton@khirnov.net>
parent e73127a4
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Showing with 33 additions and 6 deletions
libavfilter/vf_drawtext.c
View file @ c5420f10
......@@ -55,13 +55,17 @@ 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
......@@ -85,10 +89,13 @@ 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, INT_MIN, INT_MAX },
{"shadowy", "set y", OFFSET(shadowy), FF_OPT_TYPE_INT, 0, INT_MIN, INT_MAX },
{"tabsize", "set tab size", OFFSET(tabsize), FF_OPT_TYPE_INT, 4, 0, INT_MAX },
/* FT_LOAD_* flags */
......@@ -217,6 +224,7 @@ 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);
......@@ -269,6 +277,12 @@ 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));
......@@ -338,6 +352,7 @@ static av_cold void uninit(AVFilterContext *ctx)
av_freep(&dtext->fontcolor_string);
av_freep(&dtext->boxcolor_string);
av_freep(&dtext->positions);
av_freep(&dtext->shadowcolor_string);
av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
av_tree_destroy(dtext->glyphs);
dtext->glyphs = 0;
......@@ -373,6 +388,11 @@ 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;
......@@ -495,7 +515,7 @@ static inline int is_newline(uint32_t c)
}
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;
......@@ -520,12 +540,12 @@ 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);
}
}
......@@ -643,7 +663,14 @@ static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
dtext->box_line, dtext->pixel_step, dtext->boxcolor,
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;
......
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