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lavfi/drawtext: get bitmap from glyph in a separate step 

This change makes it possible to transform the glyph or get its border before
turning it into a bitmap.

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Ramiro Polla 2014-01-10 11:03:12 -02:00 committed by Michael Niedermayer
parent 5554c6dd45
commit 222fb8276d
2 changed files with 11 additions and 5 deletions
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2
doc/filters.texi
View File

@ -3594,7 +3594,7 @@ a combination of the following values:
@item no_autohint
@end table
Default value is "render".
Default value is "default".
For more information consult the documentation for the FT_LOAD_*
libfreetype flags.

14
libavfilter/vf_drawtext.c
View File

@ -206,7 +206,7 @@ static const AVOption drawtext_options[]= {
{"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
/* FT_LOAD_* flags */
{ "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" },
{ "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, "ft_load_flags" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
@ -264,6 +264,7 @@ static int glyph_cmp(void *key, const void *b)
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
{
DrawTextContext *s = ctx->priv;
FT_BitmapGlyph bitmapglyph;
Glyph *glyph;
struct AVTreeNode *node = NULL;
int ret;
@ -284,10 +285,15 @@ static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
ret = AVERROR(EINVAL);
goto error;
}
if (FT_Glyph_To_Bitmap(glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
ret = AVERROR_EXTERNAL;
goto error;
}
bitmapglyph = (FT_BitmapGlyph) *glyph->glyph;
glyph->bitmap = s->face->glyph->bitmap;
glyph->bitmap_left = s->face->glyph->bitmap_left;
glyph->bitmap_top = s->face->glyph->bitmap_top;
glyph->bitmap = bitmapglyph->bitmap;
glyph->bitmap_left = bitmapglyph->left;
glyph->bitmap_top = bitmapglyph->top;
glyph->advance = s->face->glyph->advance.x >> 6;
/* measure text height to calculate text_height (or the maximum text height) */