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harfbuzz/src/hb-ft-colr.hh

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/*
* Copyright © 2022 Behdad Esfahbod
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef HB_FT_COLR_HH
#define HB_FT_COLR_HH
#include "hb.hh"
#include FT_COLOR_H
#ifndef HB_NO_PAINT
#ifdef TT_SUPPORT_COLRV1
static hb_paint_composite_mode_t
_hb_ft_paint_composite_mode (FT_Composite_Mode mode)
{
switch (mode)
{
case FT_COLR_COMPOSITE_CLEAR: return HB_PAINT_COMPOSITE_MODE_CLEAR;
case FT_COLR_COMPOSITE_SRC: return HB_PAINT_COMPOSITE_MODE_SRC;
case FT_COLR_COMPOSITE_DEST: return HB_PAINT_COMPOSITE_MODE_DEST;
case FT_COLR_COMPOSITE_SRC_OVER: return HB_PAINT_COMPOSITE_MODE_SRC_OVER;
case FT_COLR_COMPOSITE_DEST_OVER: return HB_PAINT_COMPOSITE_MODE_DEST_OVER;
case FT_COLR_COMPOSITE_SRC_IN: return HB_PAINT_COMPOSITE_MODE_SRC_IN;
case FT_COLR_COMPOSITE_DEST_IN: return HB_PAINT_COMPOSITE_MODE_DEST_IN;
case FT_COLR_COMPOSITE_SRC_OUT: return HB_PAINT_COMPOSITE_MODE_SRC_OUT;
case FT_COLR_COMPOSITE_DEST_OUT: return HB_PAINT_COMPOSITE_MODE_DEST_OUT;
case FT_COLR_COMPOSITE_SRC_ATOP: return HB_PAINT_COMPOSITE_MODE_SRC_ATOP;
case FT_COLR_COMPOSITE_DEST_ATOP: return HB_PAINT_COMPOSITE_MODE_DEST_ATOP;
case FT_COLR_COMPOSITE_XOR: return HB_PAINT_COMPOSITE_MODE_XOR;
case FT_COLR_COMPOSITE_PLUS: return HB_PAINT_COMPOSITE_MODE_PLUS;
case FT_COLR_COMPOSITE_SCREEN: return HB_PAINT_COMPOSITE_MODE_SCREEN;
case FT_COLR_COMPOSITE_OVERLAY: return HB_PAINT_COMPOSITE_MODE_OVERLAY;
case FT_COLR_COMPOSITE_DARKEN: return HB_PAINT_COMPOSITE_MODE_DARKEN;
case FT_COLR_COMPOSITE_LIGHTEN: return HB_PAINT_COMPOSITE_MODE_LIGHTEN;
case FT_COLR_COMPOSITE_COLOR_DODGE: return HB_PAINT_COMPOSITE_MODE_COLOR_DODGE;
case FT_COLR_COMPOSITE_COLOR_BURN: return HB_PAINT_COMPOSITE_MODE_COLOR_BURN;
case FT_COLR_COMPOSITE_HARD_LIGHT: return HB_PAINT_COMPOSITE_MODE_HARD_LIGHT;
case FT_COLR_COMPOSITE_SOFT_LIGHT: return HB_PAINT_COMPOSITE_MODE_SOFT_LIGHT;
case FT_COLR_COMPOSITE_DIFFERENCE: return HB_PAINT_COMPOSITE_MODE_DIFFERENCE;
case FT_COLR_COMPOSITE_EXCLUSION: return HB_PAINT_COMPOSITE_MODE_EXCLUSION;
case FT_COLR_COMPOSITE_MULTIPLY: return HB_PAINT_COMPOSITE_MODE_MULTIPLY;
case FT_COLR_COMPOSITE_HSL_HUE: return HB_PAINT_COMPOSITE_MODE_HSL_HUE;
case FT_COLR_COMPOSITE_HSL_SATURATION: return HB_PAINT_COMPOSITE_MODE_HSL_SATURATION;
case FT_COLR_COMPOSITE_HSL_COLOR: return HB_PAINT_COMPOSITE_MODE_HSL_COLOR;
case FT_COLR_COMPOSITE_HSL_LUMINOSITY: return HB_PAINT_COMPOSITE_MODE_HSL_LUMINOSITY;
case FT_COLR_COMPOSITE_MAX: HB_FALLTHROUGH;
default: return HB_PAINT_COMPOSITE_MODE_CLEAR;
}
}
typedef struct hb_ft_paint_context_t hb_ft_paint_context_t;
static void
_hb_ft_paint (hb_ft_paint_context_t *c,
FT_OpaquePaint opaque_paint);
struct hb_ft_paint_context_t
{
hb_ft_paint_context_t (const hb_ft_font_t *ft_font,
hb_font_t *font,
hb_paint_funcs_t *paint_funcs, void *paint_data,
FT_Color *palette,
hb_color_t foreground) :
ft_font (ft_font), font(font),
funcs (paint_funcs), data (paint_data),
palette (palette), foreground (foreground) {}
void recurse (FT_OpaquePaint paint) { _hb_ft_paint (this, paint);
}
const hb_ft_font_t *ft_font;
hb_font_t *font;
hb_paint_funcs_t *funcs;
void *data;
FT_Color *palette;
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)
{
FT_Face ft_face = c->ft_font->ft_face;
FT_COLR_Paint paint;
if (!FT_Get_Paint (ft_face, opaque_paint, &paint))
return;
switch (paint.format)
{
case FT_COLR_PAINTFORMAT_COLR_LAYERS:
{
FT_OpaquePaint other_paint = {0};
while (FT_Get_Paint_Layers (ft_face,
&paint.u.colr_layers.layer_iterator,
&other_paint))
{
c->funcs->push_group (c->data);
c->recurse (other_paint);
c->funcs->pop_group (c->data, HB_PAINT_COMPOSITE_MODE_SRC_OVER);
}
}
break;
case FT_COLR_PAINTFORMAT_SOLID:
{
bool is_foreground = paint.u.solid.color.palette_index == 0xFFFF;
hb_color_t color;
if (is_foreground)
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) * paint.u.solid.color.alpha) >> 14);
else
{
FT_Color ft_color = c->palette[paint.u.solid.color.palette_index];
color = HB_COLOR (ft_color.blue,
ft_color.green,
ft_color.red,
(ft_color.alpha * paint.u.solid.color.alpha) >> 14);
}
c->funcs->color (c->data, is_foreground, color);
}
break;
case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT:
{
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, c,
_hb_ft_color_line_get_extend, nullptr
};
c->funcs->linear_gradient (c->data, &cl,
paint.u.linear_gradient.p0.x / 65536.f,
paint.u.linear_gradient.p0.y / 65536.f,
paint.u.linear_gradient.p1.x / 65536.f,
paint.u.linear_gradient.p1.y / 65536.f,
paint.u.linear_gradient.p2.x / 65536.f,
paint.u.linear_gradient.p2.y / 65536.f);
}
break;
case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT:
{
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, c,
_hb_ft_color_line_get_extend, nullptr
};
c->funcs->radial_gradient (c->data, &cl,
paint.u.radial_gradient.c0.x / 65536.f,
paint.u.radial_gradient.c0.y / 65536.f,
paint.u.radial_gradient.r0 / 65536.f,
paint.u.radial_gradient.c1.x / 65536.f,
paint.u.radial_gradient.c1.y / 65536.f,
paint.u.radial_gradient.r1 / 65536.f);
}
break;
case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT:
{
hb_color_line_t cl = {
&paint.u.linear_gradient.colorline,
_hb_ft_color_line_get_color_stops, c,
_hb_ft_color_line_get_extend, nullptr
};
c->funcs->sweep_gradient (c->data, &cl,
paint.u.sweep_gradient.center.x / 65536.f,
paint.u.sweep_gradient.center.y / 65536.f,
(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:
{
c->funcs->push_inverse_root_transform (c->data, c->font);
c->ft_font->lock.unlock ();
c->funcs->push_clip_glyph (c->data, paint.u.glyph.glyphID, c->font);
c->ft_font->lock.lock ();
c->funcs->push_root_transform (c->data, c->font);
c->recurse (paint.u.glyph.paint);
c->funcs->pop_root_transform (c->data);
c->funcs->pop_clip (c->data);
c->funcs->pop_inverse_root_transform (c->data);
}
break;
case FT_COLR_PAINTFORMAT_COLR_GLYPH:
{
/* TODO Depth counter. */
FT_OpaquePaint other_paint = {0};
if (FT_Get_Color_Glyph_Paint (ft_face, paint.u.colr_glyph.glyphID,
FT_COLOR_NO_ROOT_TRANSFORM,
&other_paint))
{
bool has_clip_box;
FT_ClipBox clip_box;
has_clip_box = FT_Get_Color_Glyph_ClipBox (ft_face, paint.u.colr_glyph.glyphID, &clip_box);
has_clip_box = 0;
if (has_clip_box)
c->funcs->push_clip_rectangle (c->data,
clip_box.bottom_left.x / 64.f,
clip_box.bottom_left.y / 64.f,
clip_box.top_right.x / 64.f,
clip_box.top_right.y / 64.f);
c->recurse (other_paint);
if (has_clip_box)
c->funcs->pop_clip (c->data);
}
}
break;
case FT_COLR_PAINTFORMAT_TRANSFORM:
{
c->funcs->push_transform (c->data,
paint.u.transform.affine.xx / 65536.f,
paint.u.transform.affine.yx / 65536.f,
paint.u.transform.affine.xy / 65536.f,
paint.u.transform.affine.yy / 65536.f,
paint.u.transform.affine.dx / 65536.f,
paint.u.transform.affine.dy / 65536.f);
c->recurse (paint.u.transform.paint);
c->funcs->pop_transform (c->data);
}
break;
case FT_COLR_PAINTFORMAT_TRANSLATE:
{
c->funcs->push_transform (c->data,
0.f, 0.f, 0.f, 0.f,
paint.u.translate.dx / 65536.f,
paint.u.translate.dy / 65536.f);
c->recurse (paint.u.translate.paint);
c->funcs->pop_transform (c->data);
}
break;
case FT_COLR_PAINTFORMAT_SCALE:
{
bool has_translate = paint.u.scale.center_x != 0 || paint.u.scale.center_y != 0;
if (has_translate)
c->funcs->push_transform (c->data,
1.f, 0.f, 0.f, 1.f,
+paint.u.scale.center_x / 65536.f,
+paint.u.scale.center_y / 65536.f);
c->funcs->push_transform (c->data,
paint.u.scale.scale_x / 65536.f,
0.f, 0.f,
paint.u.scale.scale_y / 65536.f,
0.f, 0.f);
if (has_translate)
c->funcs->push_transform (c->data,
1.f, 0.f, 0.f, 1.f,
-paint.u.scale.center_x / 65536.f,
-paint.u.scale.center_y / 65536.f);
c->recurse (paint.u.scale.paint);
c->funcs->pop_transform (c->data);
if (has_translate)
{
c->funcs->pop_transform (c->data);
c->funcs->pop_transform (c->data);
}
}
break;
case FT_COLR_PAINTFORMAT_ROTATE:
{
float a = paint.u.rotate.angle / 65536.f;
float cc = cosf (a * (float) M_PI);
float ss = sinf (a * (float) M_PI);
c->funcs->push_transform (c->data,
1.f, 0.f, 0.f, 1.f,
+paint.u.rotate.center_x / 65536.f,
+paint.u.rotate.center_y / 65536.f);
c->funcs->push_transform (c->data, cc, ss, -ss, cc, 0., 0.);
c->funcs->push_transform (c->data,
1.f, 0.f, 0.f, 1.f,
-paint.u.rotate.center_x / 65536.f,
-paint.u.rotate.center_y / 65536.f);
c->recurse (paint.u.rotate.paint);
c->funcs->pop_transform (c->data);
c->funcs->pop_transform (c->data);
c->funcs->pop_transform (c->data);
}
break;
case FT_COLR_PAINTFORMAT_SKEW:
{
float x = +tanf (paint.u.skew.x_skew_angle / 65536.f * (float) M_PI);
float y = -tanf (paint.u.skew.y_skew_angle / 65536.f * (float) M_PI);
c->funcs->push_transform (c->data,
1.f, 0.f, 0.f, 1.f,
+paint.u.skew.center_x / 65536.f,
+paint.u.skew.center_y / 65536.f);
c->funcs->push_transform (c->data, 1., y, x, 1., 0., 0.);
c->funcs->push_transform (c->data,
1.f, 0.f, 0.f, 1.f,
-paint.u.skew.center_x / 65536.f,
-paint.u.skew.center_y / 65536.f);
c->recurse (paint.u.skew.paint);
c->funcs->pop_transform (c->data);
c->funcs->pop_transform (c->data);
c->funcs->pop_transform (c->data);
}
break;
case FT_COLR_PAINTFORMAT_COMPOSITE:
{
c->funcs->push_group (c->data);
c->recurse (paint.u.composite.backdrop_paint);
c->funcs->push_group (c->data);
c->recurse (paint.u.composite.source_paint);
c->funcs->pop_group (c->data, _hb_ft_paint_composite_mode (paint.u.composite.composite_mode));
c->funcs->pop_group (c->data, HB_PAINT_COMPOSITE_MODE_SRC_OVER);
}
break;
case FT_COLR_PAINT_FORMAT_MAX: break;
default: HB_FALLTHROUGH;
case FT_COLR_PAINTFORMAT_UNSUPPORTED: break;
}
}
#endif
static bool
hb_ft_paint_glyph_colr (hb_font_t *font,
void *font_data,
hb_codepoint_t gid,
hb_paint_funcs_t *paint_funcs, void *paint_data,
unsigned int palette_index,
hb_color_t foreground,
void *user_data)
{
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
FT_Face ft_face = ft_font->ft_face;
/* Face is locked. */
FT_Error error;
FT_Color* palette;
FT_LayerIterator iterator;
FT_Bool have_layers;
FT_UInt layer_glyph_index;
FT_UInt layer_color_index;
error = FT_Palette_Select(ft_face, palette_index, &palette);
if (error)
palette = NULL;
#ifdef TT_SUPPORT_COLRV1
/* COLRv1 */
FT_OpaquePaint paint = {0};
if (FT_Get_Color_Glyph_Paint (ft_face, gid,
FT_COLOR_NO_ROOT_TRANSFORM,
&paint))
{
FT_ClipBox clip_box;
bool has_clip;
has_clip = FT_Get_Color_Glyph_ClipBox (ft_face, gid, &clip_box);
if (has_clip)
paint_funcs->push_clip_rectangle (paint_data,
clip_box.bottom_left.x - font->slant_xy * clip_box.bottom_left.y,
clip_box.bottom_left.y,
clip_box.top_right.x - font->slant_xy * clip_box.top_right.y,
clip_box.top_right.y);
paint_funcs->push_root_transform (paint_data, font);
hb_ft_paint_context_t c (ft_font, font,
paint_funcs, paint_data,
palette, foreground);
_hb_ft_paint (&c, paint);
paint_funcs->pop_root_transform (paint_data);
if (has_clip)
paint_funcs->pop_clip (paint_data);
return true;
}
#endif
/* COLRv0 */
iterator.p = NULL;
have_layers = FT_Get_Color_Glyph_Layer(ft_face,
gid,
&layer_glyph_index,
&layer_color_index,
&iterator);
if (palette && have_layers)
{
do
{
hb_bool_t is_foreground = true;
hb_color_t color = foreground;
if ( layer_color_index != 0xFFFF )
{
FT_Color layer_color = palette[layer_color_index];
color = HB_COLOR (layer_color.blue,
layer_color.green,
layer_color.red,
layer_color.alpha);
is_foreground = false;
}
ft_font->lock.unlock ();
paint_funcs->push_clip_glyph (paint_data, layer_glyph_index, font);
ft_font->lock.lock ();
paint_funcs->color (paint_data, is_foreground, color);
paint_funcs->pop_clip (paint_data);
} while (FT_Get_Color_Glyph_Layer(ft_face,
gid,
&layer_glyph_index,
&layer_color_index,
&iterator));
return true;
}
return false;
}
#endif
#endif /* HB_FT_COLR_HH */
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