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[ft-colr] Simplify color-stop callback

This commit is contained in:
Behdad Esfahbod 2022-12-23 12:06:18 -07:00
parent 1cc3b10008
commit 3a1385f019
1 changed files with 80 additions and 90 deletions
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170
src/hb-ft-colr.hh
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@ -72,90 +72,6 @@ _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;
FT_ColorStopIterator iter = c->color_stop_iterator;
if (start >= c->color_stop_iterator.num_color_stops)
{
*count = 0;
return c->color_stop_iterator.num_color_stops;
}
while (c->color_stop_iterator.current_color_stop < start)
FT_Get_Colorline_Stops(data->face,
&stop,
&c->color_stop_iterator);
while (count && *count &&
FT_Get_Colorline_Stops(data->face,
&stop,
&c->color_stop_iterator))
{
color_stops->offset = stop.stop_offset / 16384.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 * stop.color.alpha) >> 14);
}
color_stops++;
wrote++;
}
*count = wrote;
// reset the iterator for next time
c->color_stop_iterator = iter;
}
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;
}
}
typedef struct hb_ft_paint_context_t hb_ft_paint_context_t;
static void
@ -184,6 +100,83 @@ struct hb_ft_paint_context_t
hb_color_t foreground;
};
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 *cl = (FT_ColorLine *) color_line_data;
hb_ft_paint_context_t *c = (hb_ft_paint_context_t *) user_data;
if (count)
{
FT_ColorStop stop;
unsigned wrote = 0;
FT_ColorStopIterator iter = cl->color_stop_iterator;
if (start >= cl->color_stop_iterator.num_color_stops)
{
*count = 0;
return cl->color_stop_iterator.num_color_stops;
}
while (cl->color_stop_iterator.current_color_stop < start)
FT_Get_Colorline_Stops(c->ft_font->ft_face,
&stop,
&cl->color_stop_iterator);
while (count && *count &&
FT_Get_Colorline_Stops(c->ft_font->ft_face,
&stop,
&cl->color_stop_iterator))
{
color_stops->offset = stop.stop_offset / 16384.f;
color_stops->is_foreground = stop.color.palette_index == 0xFFFF;
if (color_stops->is_foreground)
color_stops->color = HB_COLOR (hb_color_get_blue (c->foreground),
hb_color_get_green (c->foreground),
hb_color_get_red (c->foreground),
(hb_color_get_alpha (c->foreground) * stop.color.alpha) >> 14);
else
{
FT_Color ft_color = c->palette[stop.color.palette_index];
color_stops->color = HB_COLOR (ft_color.blue,
ft_color.green,
ft_color.red,
(ft_color.alpha * stop.color.alpha) >> 14);
}
color_stops++;
wrote++;
}
*count = wrote;
// reset the iterator for next time
cl->color_stop_iterator = iter;
}
return cl->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;
}
}
void
_hb_ft_paint (hb_ft_paint_context_t *c,
FT_OpaquePaint opaque_paint)
@ -230,10 +223,9 @@ _hb_ft_paint (hb_ft_paint_context_t *c,
break;
case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT:
{
_hb_ft_get_color_stops_data_t data = {ft_face, c->palette, c->foreground};
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, &data,
_hb_ft_color_line_get_color_stops, c,
_hb_ft_color_line_get_extend, nullptr
};
@ -248,10 +240,9 @@ _hb_ft_paint (hb_ft_paint_context_t *c,
break;
case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT:
{
_hb_ft_get_color_stops_data_t data = {ft_face, c->palette, c->foreground};
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, &data,
_hb_ft_color_line_get_color_stops, c,
_hb_ft_color_line_get_extend, nullptr
};
@ -266,10 +257,9 @@ _hb_ft_paint (hb_ft_paint_context_t *c,
break;
case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT:
{
_hb_ft_get_color_stops_data_t data = {ft_face, c->palette, c->foreground};
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, &data,
_hb_ft_color_line_get_color_stops, c,
_hb_ft_color_line_get_extend, nullptr
};