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[ft-paint] Hook up gradients

This commit is contained in:
Behdad Esfahbod 2022-12-22 21:23:45 -07:00
parent fe4e9bd930
commit 6ebcc9d2e1
1 changed files with 122 additions and 3 deletions
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125
src/hb-ft-colr.hh
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@ -69,6 +69,76 @@ _hb_ft_paint_composite_mode (FT_Composite_Mode mode)
}
}
typedef struct
{
FT_Face face;
FT_Color *palette;
hb_color_t foreground;
} _hb_ft_get_color_stops_data_t;
static unsigned
_hb_ft_color_line_get_color_stops (hb_color_line_t *color_line,
void *color_line_data,
unsigned int start,
unsigned int *count,
hb_color_stop_t *color_stops,
void *user_data)
{
FT_ColorLine *c = (FT_ColorLine *) color_line_data;
_hb_ft_get_color_stops_data_t *data = (_hb_ft_get_color_stops_data_t *) user_data;
if (count)
{
FT_ColorStop stop;
unsigned wrote = 0;
c->color_stop_iterator.current_color_stop = start;
while (count && *count &&
FT_Get_Colorline_Stops(data->face,
&stop,
&c->color_stop_iterator))
{
color_stops->offset = stop.stop_offset / 65536.f;
color_stops->is_foreground = stop.color.palette_index == 0xFFFF;
if (color_stops->is_foreground)
color_stops->color = HB_COLOR (hb_color_get_blue (data->foreground),
hb_color_get_green (data->foreground),
hb_color_get_red (data->foreground),
(hb_color_get_alpha (data->foreground) * stop.color.alpha) >> 14);
else
{
FT_Color ft_color = data->palette[stop.color.palette_index];
color_stops->color = HB_COLOR (ft_color.blue,
ft_color.green,
ft_color.red,
ft_color.alpha);
}
color_stops++;
wrote++;
}
*count = wrote;
}
return c->color_stop_iterator.num_color_stops;
}
static hb_paint_extend_t
_hb_ft_color_line_get_extend (hb_color_line_t *color_line,
void *color_line_data,
void *user_data)
{
FT_ColorLine *c = (FT_ColorLine *) color_line_data;
switch (c->extend)
{
default:
case FT_COLR_PAINT_EXTEND_PAD: return HB_PAINT_EXTEND_PAD;
case FT_COLR_PAINT_EXTEND_REPEAT: return HB_PAINT_EXTEND_REPEAT;
case FT_COLR_PAINT_EXTEND_REFLECT: return HB_PAINT_EXTEND_REFLECT;
}
}
static void
_hb_ft_paint (FT_OpaquePaint opaque_paint,
const hb_ft_font_t *ft_font,
@ -120,9 +190,58 @@ _hb_ft_paint (FT_OpaquePaint opaque_paint,
paint_funcs->color (paint_data, is_foreground, color);
}
break;
case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: break;
case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: break;
case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: break;
case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT:
{
_hb_ft_get_color_stops_data_t data = {ft_face, palette, foreground};
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, &data,
_hb_ft_color_line_get_extend, nullptr
};
paint_funcs->linear_gradient (paint_data, &cl,
paint.u.linear_gradient.p0.x,
paint.u.linear_gradient.p0.y,
paint.u.linear_gradient.p1.x,
paint.u.linear_gradient.p1.y,
paint.u.linear_gradient.p2.x,
paint.u.linear_gradient.p2.y);
}
break;
case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT:
{
_hb_ft_get_color_stops_data_t data = {ft_face, palette, foreground};
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, &data,
_hb_ft_color_line_get_extend, nullptr
};
paint_funcs->radial_gradient (paint_data, &cl,
paint.u.radial_gradient.c0.x,
paint.u.radial_gradient.c0.y,
paint.u.radial_gradient.r0,
paint.u.radial_gradient.c1.x,
paint.u.radial_gradient.c1.y,
paint.u.radial_gradient.r1);
}
break;
case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT:
{
_hb_ft_get_color_stops_data_t data = {ft_face, palette, foreground};
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, &data,
_hb_ft_color_line_get_extend, nullptr
};
paint_funcs->sweep_gradient (paint_data, &cl,
paint.u.sweep_gradient.center.x,
paint.u.sweep_gradient.center.y,
(paint.u.sweep_gradient.start_angle / 65536.f + 1) * (float) M_PI,
(paint.u.sweep_gradient.end_angle / 65536.f + 1) * (float) M_PI);
}
break;
case FT_COLR_PAINTFORMAT_GLYPH:
{
//paint_funcs->push_inverse_root_transform (paint_data, font);