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[COLR/cairo] Add paint_color_glyph func

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Implement in cairo to use scaled-font's glyph cache.
This commit is contained in:
Behdad Esfahbod 2023-08-14 15:57:24 -06:00
parent 8d19274c2d
commit 74527670fc
5 changed files with 107 additions and 0 deletions
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4
src/OT/Color/COLR/COLR.hh
View file

@ -2436,6 +2436,10 @@ void PaintColrLayers::paint_glyph (hb_paint_context_t *c) const
void PaintColrGlyph::paint_glyph (hb_paint_context_t *c) const
{
TRACE_PAINT (this);
if (c->funcs->color_glyph (c->data, gid, c->font))
return;
const COLR *colr_table = c->get_colr_table ();
const Paint *paint = colr_table->get_base_glyph_paint (gid);

19
src/hb-cairo.cc
View file

@ -166,6 +166,24 @@ hb_cairo_pop_transform (hb_paint_funcs_t *pfuncs HB_UNUSED,
cairo_restore (cr);
}
static hb_bool_t
hb_cairo_paint_color_glyph (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font,
void *user_data HB_UNUSED)
{
hb_cairo_context_t *c = (hb_cairo_context_t *) paint_data;
cairo_t *cr = c->cr;
cairo_glyph_t cairo_glyph = { glyph, 0, 0 };
cairo_set_scaled_font (cr, c->scaled_font);
cairo_set_font_size (cr, hb_face_get_upem (hb_font_get_face (font)));
cairo_show_glyphs (cr, &cairo_glyph, 1);
return true;
}
static void
hb_cairo_push_clip_glyph (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
@ -397,6 +415,7 @@ static struct hb_cairo_paint_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<
hb_paint_funcs_set_push_transform_func (funcs, hb_cairo_push_transform, nullptr, nullptr);
hb_paint_funcs_set_pop_transform_func (funcs, hb_cairo_pop_transform, nullptr, nullptr);
hb_paint_funcs_set_color_glyph_func (funcs, hb_cairo_paint_color_glyph, nullptr, nullptr);
hb_paint_funcs_set_push_clip_glyph_func (funcs, hb_cairo_push_clip_glyph, nullptr, nullptr);
hb_paint_funcs_set_push_clip_rectangle_func (funcs, hb_cairo_push_clip_rectangle, nullptr, nullptr);
hb_paint_funcs_set_pop_clip_func (funcs, hb_cairo_pop_clip, nullptr, nullptr);

25
src/hb-paint.cc
View file

@ -54,6 +54,12 @@ static void
hb_paint_pop_transform_nil (hb_paint_funcs_t *funcs, void *paint_data,
void *user_data) {}
static hb_bool_t
hb_paint_color_glyph_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font,
void *user_data) { return false; }
static void
hb_paint_push_clip_glyph_nil (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph,
@ -473,6 +479,25 @@ hb_paint_pop_transform (hb_paint_funcs_t *funcs, void *paint_data)
funcs->pop_transform (paint_data);
}
/**
* hb_paint_color_glyph:
* @funcs: paint functions
* @paint_data: associated data passed by the caller
* @glyph: the glyph ID
* @font: the font
*
* Perform a "color-glyph" paint operation.
*
* XSince: REPLACEME
*/
hb_bool_t
hb_paint_color_glyph (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font)
{
return funcs->color_glyph (paint_data, glyph, font);
}
/**
* hb_paint_push_clip_glyph:
* @funcs: paint functions

51
src/hb-paint.h
View file

@ -136,6 +136,35 @@ typedef void (*hb_paint_pop_transform_func_t) (hb_paint_funcs_t *funcs,
void *paint_data,
void *user_data);
/**
* hb_paint_color_glyph_func_t:
* @funcs: paint functions object
* @paint_data: The data accompanying the paint functions in hb_font_paint_glyph()
* @glyph: the glyph ID
* @font: the font
* @user_data: User data pointer passed to hb_paint_funcs_set_color_glyph_func()
*
* A virtual method for the #hb_paint_funcs_t to render a color glyph by glyph index.
*
* XXX
*
* The coordinates of the glyph outline are interpreted according
* to the current transform.
*
* This clip is applied in addition to the current clip,
* and remains in effect until a matching call to
* the #hb_paint_funcs_pop_clip_func_t vfunc.
*
* Return value: %true if the glyph was painted, %false otherwise.
*
* XSince: REPLACEME
*/
typedef hb_bool_t (*hb_paint_color_glyph_func_t) (hb_paint_funcs_t *funcs,
void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font,
void *user_data);
/**
* hb_paint_push_clip_glyph_func_t:
* @funcs: paint functions object
@ -723,6 +752,23 @@ hb_paint_funcs_set_pop_transform_func (hb_paint_funcs_t *funcs,
void *user_data,
hb_destroy_func_t destroy);
/**
* hb_paint_funcs_set_color_glyph_func:
* @funcs: A paint functions struct
* @func: (closure user_data) (destroy destroy) (scope notified): The color-glyph callback
* @user_data: Data to pass to @func
* @destroy: (nullable): Function to call when @user_data is no longer needed
*
* Sets the color-glyph callback on the paint functions struct.
*
* Since: 7.0.0
*/
HB_EXTERN void
hb_paint_funcs_set_color_glyph_func (hb_paint_funcs_t *funcs,
hb_paint_color_glyph_func_t func,
void *user_data,
hb_destroy_func_t destroy);
/**
* hb_paint_funcs_set_push_clip_glyph_func:
* @funcs: A paint functions struct
@ -922,6 +968,11 @@ hb_paint_push_transform (hb_paint_funcs_t *funcs, void *paint_data,
HB_EXTERN void
hb_paint_pop_transform (hb_paint_funcs_t *funcs, void *paint_data);
HB_EXTERN hb_bool_t
hb_paint_color_glyph (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font);
HB_EXTERN void
hb_paint_push_clip_glyph (hb_paint_funcs_t *funcs, void *paint_data,
hb_codepoint_t glyph,

8
src/hb-paint.hh
View file

@ -32,6 +32,7 @@
#define HB_PAINT_FUNCS_IMPLEMENT_CALLBACKS \
HB_PAINT_FUNC_IMPLEMENT (push_transform) \
HB_PAINT_FUNC_IMPLEMENT (pop_transform) \
HB_PAINT_FUNC_IMPLEMENT (color_glyph) \
HB_PAINT_FUNC_IMPLEMENT (push_clip_glyph) \
HB_PAINT_FUNC_IMPLEMENT (push_clip_rectangle) \
HB_PAINT_FUNC_IMPLEMENT (pop_clip) \
@ -77,6 +78,13 @@ struct hb_paint_funcs_t
void pop_transform (void *paint_data)
{ func.pop_transform (this, paint_data,
!user_data ? nullptr : user_data->pop_transform); }
bool color_glyph (void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font)
{ return func.color_glyph (this, paint_data,
glyph,
font,
!user_data ? nullptr : user_data->push_clip_glyph); }
void push_clip_glyph (void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font)