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harfbuzz/src/hb-cairo.cc

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/*
* Copyright © 2022 Red Hat, Inc.
*
* 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.
*
* Red Hat Author(s): Matthias Clasen
*/
#include "hb.hh"
#ifdef HAVE_CAIRO
#include "hb-cairo.h"
#include "hb-cairo-utils.hh"
#include "hb-machinery.hh"
#include "hb-utf.hh"
/**
* SECTION:hb-cairo
* @title: hb-cairo
* @short_description: Cairo integration
* @include: hb-cairo.h
*
* Functions for using HarfBuzz with the cairo library.
*
* HarfBuzz supports using cairo for rendering.
**/
static void
hb_cairo_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *draw_data,
hb_draw_state_t *st HB_UNUSED,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) draw_data;
cairo_move_to (cr, (double) to_x, (double) to_y);
}
static void
hb_cairo_line_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *draw_data,
hb_draw_state_t *st HB_UNUSED,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) draw_data;
cairo_line_to (cr, (double) to_x, (double) to_y);
}
static void
hb_cairo_cubic_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *draw_data,
hb_draw_state_t *st HB_UNUSED,
float control1_x, float control1_y,
float control2_x, float control2_y,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) draw_data;
cairo_curve_to (cr,
(double) control1_x, (double) control1_y,
(double) control2_x, (double) control2_y,
(double) to_x, (double) to_y);
}
static void
hb_cairo_close_path (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *draw_data,
hb_draw_state_t *st HB_UNUSED,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) draw_data;
cairo_close_path (cr);
}
static inline void free_static_cairo_draw_funcs ();
static struct hb_cairo_draw_funcs_lazy_loader_t : hb_draw_funcs_lazy_loader_t<hb_cairo_draw_funcs_lazy_loader_t>
{
static hb_draw_funcs_t *create ()
{
hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
hb_draw_funcs_set_move_to_func (funcs, hb_cairo_move_to, nullptr, nullptr);
hb_draw_funcs_set_line_to_func (funcs, hb_cairo_line_to, nullptr, nullptr);
hb_draw_funcs_set_cubic_to_func (funcs, hb_cairo_cubic_to, nullptr, nullptr);
hb_draw_funcs_set_close_path_func (funcs, hb_cairo_close_path, nullptr, nullptr);
hb_draw_funcs_make_immutable (funcs);
hb_atexit (free_static_cairo_draw_funcs);
return funcs;
}
} static_cairo_draw_funcs;
static inline
void free_static_cairo_draw_funcs ()
{
static_cairo_draw_funcs.free_instance ();
}
static hb_draw_funcs_t *
hb_cairo_draw_get_funcs ()
{
return static_cairo_draw_funcs.get_unconst ();
}
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static void
hb_cairo_push_transform (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
float xx, float yx,
float xy, float yy,
float dx, float dy,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_matrix_t m;
cairo_save (cr);
cairo_matrix_init (&m, (double) xx, (double) yx,
(double) xy, (double) yy,
(double) dx, (double) dy);
cairo_transform (cr, &m);
}
static void
hb_cairo_pop_transform (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_restore (cr);
}
static void
hb_cairo_push_clip_glyph (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_save (cr);
cairo_new_path (cr);
hb_font_draw_glyph (font, glyph, hb_cairo_draw_get_funcs (), cr);
cairo_close_path (cr);
cairo_clip (cr);
}
static void
hb_cairo_push_clip_rectangle (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
float xmin, float ymin, float xmax, float ymax,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_save (cr);
cairo_rectangle (cr,
(double) xmin, (double) ymin,
(double) (xmax - xmin), (double) (ymax - ymin));
cairo_clip (cr);
}
static void
hb_cairo_pop_clip (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_restore (cr);
}
static void
hb_cairo_push_group (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_save (cr);
cairo_push_group (cr);
}
static void
hb_cairo_pop_group (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_paint_composite_mode_t mode,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_pop_group_to_source (cr);
cairo_set_operator (cr, hb_paint_composite_mode_to_cairo (mode));
cairo_paint (cr);
cairo_restore (cr);
}
static void
hb_cairo_paint_color (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_bool_t use_foreground,
hb_color_t color,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
cairo_set_source_rgba (cr,
hb_color_get_red (color) / 255.,
hb_color_get_green (color) / 255.,
hb_color_get_blue (color) / 255.,
hb_color_get_alpha (color) / 255.);
cairo_paint (cr);
}
static hb_bool_t
hb_cairo_paint_image (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_blob_t *blob,
unsigned width,
unsigned height,
hb_tag_t format,
float slant,
hb_glyph_extents_t *extents,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
return hb_cairo_paint_glyph_image (cr, blob, width, height, format, slant, extents);
}
static void
hb_cairo_paint_linear_gradient (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_color_line_t *color_line,
float x0, float y0,
float x1, float y1,
float x2, float y2,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *)paint_data;
hb_cairo_paint_linear_gradient (cr, color_line, x0, y0, x1, y1, x2, y2);
}
static void
hb_cairo_paint_radial_gradient (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_color_line_t *color_line,
float x0, float y0, float r0,
float x1, float y1, float r1,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *)paint_data;
hb_cairo_paint_radial_gradient (cr, color_line, x0, y0, r0, x1, y1, r1);
}
static void
hb_cairo_paint_sweep_gradient (hb_paint_funcs_t *pfuncs HB_UNUSED,
void *paint_data,
hb_color_line_t *color_line,
float x0, float y0,
float start_angle, float end_angle,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
hb_cairo_paint_sweep_gradient (cr, color_line, x0, y0, start_angle, end_angle);
}
static inline void free_static_cairo_paint_funcs ();
static struct hb_cairo_paint_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_cairo_paint_funcs_lazy_loader_t>
{
static hb_paint_funcs_t *create ()
{
hb_paint_funcs_t *funcs = hb_paint_funcs_create ();
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_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);
hb_paint_funcs_set_push_group_func (funcs, hb_cairo_push_group, nullptr, nullptr);
hb_paint_funcs_set_pop_group_func (funcs, hb_cairo_pop_group, nullptr, nullptr);
hb_paint_funcs_set_color_func (funcs, hb_cairo_paint_color, nullptr, nullptr);
hb_paint_funcs_set_image_func (funcs, hb_cairo_paint_image, nullptr, nullptr);
hb_paint_funcs_set_linear_gradient_func (funcs, hb_cairo_paint_linear_gradient, nullptr, nullptr);
hb_paint_funcs_set_radial_gradient_func (funcs, hb_cairo_paint_radial_gradient, nullptr, nullptr);
hb_paint_funcs_set_sweep_gradient_func (funcs, hb_cairo_paint_sweep_gradient, nullptr, nullptr);
hb_paint_funcs_make_immutable (funcs);
hb_atexit (free_static_cairo_paint_funcs);
return funcs;
}
} static_cairo_paint_funcs;
static inline
void free_static_cairo_paint_funcs ()
{
static_cairo_paint_funcs.free_instance ();
}
static hb_paint_funcs_t *
hb_cairo_paint_get_funcs ()
{
return static_cairo_paint_funcs.get_unconst ();
}
static cairo_status_t
hb_cairo_render_color_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents);
#endif
static const cairo_user_data_key_t hb_cairo_face_user_data_key = {0};
static const cairo_user_data_key_t hb_cairo_font_user_data_key = {0};
static void hb_cairo_face_destroy (void *p) { hb_face_destroy ((hb_face_t *) p); }
static void hb_cairo_font_destroy (void *p) { hb_font_destroy ((hb_font_t *) p); }
static cairo_status_t
hb_cairo_init_scaled_font (cairo_scaled_font_t *scaled_font,
cairo_t *cr HB_UNUSED,
cairo_font_extents_t *extents)
{
hb_font_t *font = (hb_font_t *) cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&hb_cairo_font_user_data_key);
if (!font)
{
hb_face_t *face = (hb_face_t *) cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&hb_cairo_face_user_data_key);
font = hb_font_create (face);
// TODO Set variations
// TODO Set (what?) scale and slant
}
cairo_scaled_font_set_user_data (scaled_font,
&hb_cairo_font_user_data_key,
(void *) hb_font_reference (font),
hb_cairo_font_destroy);
hb_position_t x_scale, y_scale;
hb_font_get_scale (font, &x_scale, &y_scale);
hb_font_extents_t hb_extents;
hb_font_get_h_extents (font, &hb_extents);
extents->ascent = (double) hb_extents.ascender / y_scale;
extents->descent = (double) -hb_extents.descender / y_scale;
extents->height = extents->ascent + extents->descent;
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
hb_cairo_render_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents)
{
hb_font_t *font = (hb_font_t *) cairo_scaled_font_get_user_data (scaled_font,
&hb_cairo_font_user_data_key);
hb_position_t x_scale, y_scale;
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
hb_font_draw_glyph (font, glyph, hb_cairo_draw_get_funcs (), cr);
cairo_fill (cr);
return CAIRO_STATUS_SUCCESS;
}
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static cairo_status_t
hb_cairo_render_color_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents)
{
hb_font_t *font = (hb_font_t *) cairo_scaled_font_get_user_data (scaled_font,
&hb_cairo_font_user_data_key);
unsigned int palette = 0;
#ifdef CAIRO_COLOR_PALETTE_DEFAULT
cairo_font_options_t *options = cairo_font_options_create ();
cairo_scaled_font_get_font_options (scaled_font, options);
palette = cairo_font_options_get_color_palette (options);
cairo_font_options_destroy (options);
#endif
hb_color_t color = HB_COLOR (0, 0, 0, 255);
cairo_pattern_t *pattern = cairo_get_source (cr);
if (cairo_pattern_get_type (pattern) == CAIRO_PATTERN_TYPE_SOLID)
{
double r, g, b, a;
cairo_pattern_get_rgba (pattern, &r, &g, &b, &a);
color = HB_COLOR ((int)(b * 255.), (int)(g * 255.), (int) (r * 255.), (int)(a * 255.));
}
hb_position_t x_scale, y_scale;
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
hb_font_paint_glyph (font, glyph, hb_cairo_paint_get_funcs (), cr, palette, color);
return CAIRO_STATUS_SUCCESS;
}
#endif
static cairo_font_face_t *
user_font_face_create (hb_face_t *face)
{
cairo_font_face_t *cairo_face;
cairo_face = cairo_user_font_face_create ();
cairo_user_font_face_set_init_func (cairo_face, hb_cairo_init_scaled_font);
cairo_user_font_face_set_render_glyph_func (cairo_face, hb_cairo_render_glyph);
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
if (hb_ot_color_has_png (face) || hb_ot_color_has_layers (face) || hb_ot_color_has_paint (face))
cairo_user_font_face_set_render_color_glyph_func (cairo_face, hb_cairo_render_color_glyph);
#endif
cairo_font_face_set_user_data (cairo_face,
&hb_cairo_face_user_data_key,
(void *) hb_face_reference (face),
hb_cairo_face_destroy);
return cairo_face;
}
/**
* hb_cairo_font_face_create_for_face:
* @face: a `hb_face_t`
*
* Creates a `cairo_font_face_t` for rendering text according
* to @face.
*
* Returns: a newly created `cairo_font_face_t`
*
* Since: REPLACEME
*/
cairo_font_face_t *
hb_cairo_font_face_create_for_face (hb_face_t *face)
{
hb_face_make_immutable (face);
return user_font_face_create (face);
}
/**
* hb_cairo_font_face_get_face:
* @font_face: a `cairo_font_face_t`
*
* Gets the `hb_face_t` associated with @font_face.
*
* Returns: (nullable): the `hb_face_t` associated with @font_face
*
* Since: REPLACEME
*/
hb_face_t *
hb_cairo_font_face_get_face (cairo_font_face_t *font_face)
{
return (hb_face_t *) cairo_font_face_get_user_data (font_face, &hb_cairo_face_user_data_key);
}
/**
* hb_cairo_font_face_create_for_font:
* @font: a `hb_font_t`
*
* Creates a `cairo_font_face_t` for rendering text according
* to @font.
*
* Note that the scale of @font does not affect the rendering.
*
* Returns: a newly created `cairo_font_face_t`
*
* Since: REPLACEME
*/
cairo_font_face_t *
hb_cairo_font_face_create_for_font (hb_font_t *font)
{
hb_font_make_immutable (font);
auto *cairo_face = user_font_face_create (font->face);
cairo_font_face_set_user_data (cairo_face,
&hb_cairo_font_user_data_key,
(void *) hb_font_reference (font),
hb_cairo_font_destroy);
return cairo_face;
}
/**
* hb_cairo_font_face_get_font:
* @font_face: a `cairo_font_face_t`
*
* Gets the `hb_font_t` that @font_face was created from.
*
* Returns: (nullable): the `hb_font_t` that @font_face was created from
*
* Since: REPLACEME
*/
hb_font_t *
hb_cairo_font_face_get_font (cairo_font_face_t *font_face)
{
return (hb_font_t *) cairo_font_face_get_user_data (font_face, &hb_cairo_font_user_data_key);
}
/**
* hb_cairo_scaled_font_get_font:
* @scaled_font: a `cairo_scaled_font_t`
*
* Gets the `hb_font_t` associated with @scaled_font.
*
* Returns: (nullable): the `hb_font_t` associated with @scaled_font
*
* Since: REPLACEME
*/
hb_font_t *
hb_cairo_scaled_font_get_font (cairo_scaled_font_t *scaled_font)
{
return (hb_font_t *) cairo_scaled_font_get_user_data (scaled_font, &hb_cairo_font_user_data_key);
}
/**
* hb_cairo_glyphs_from_buffer:
* @buffer: a `hb_buffer_t` containing glyphs
* @text: (nullable): the text that was shaped in @buffer
* @text_len: the length of @text in bytes
* @utf8_clusters: `true` to provide cluster positions in bytes, instead of characters
* @scale_factor: scale factor to scale positions by
* @glyphs: return location for an array of `cairo_glyph_t`
* @num_glyphs: return location for the length of @glyphs
* @clusters: return location for an array of cluster positions
* @num_clusters: return location for the length of @clusters
* @cluster_flags: return location for cluster flags
*
* Extracts information from @buffer in a form that can be
* passed to cairo_show_text_glyphs().
*
* Since: REPLACEME
*/
void
hb_cairo_glyphs_from_buffer (hb_buffer_t *buffer,
const char *text,
int text_len,
hb_bool_t utf8_clusters,
int scale_factor,
cairo_glyph_t **glyphs,
unsigned int *num_glyphs,
cairo_text_cluster_t **clusters,
unsigned int *num_clusters,
cairo_text_cluster_flags_t *cluster_flags)
{
if (text && text_len < 0)
text_len = strlen (text);
*num_glyphs = hb_buffer_get_length (buffer);
hb_glyph_info_t *hb_glyph = hb_buffer_get_glyph_infos (buffer, nullptr);
hb_glyph_position_t *hb_position = hb_buffer_get_glyph_positions (buffer, nullptr);
*glyphs = cairo_glyph_allocate (*num_glyphs + 1);
if (text)
{
*num_clusters = *num_glyphs ? 1 : 0;
for (unsigned int i = 1; i < *num_glyphs; i++)
if (hb_glyph[i].cluster != hb_glyph[i-1].cluster)
(*num_clusters)++;
*clusters = cairo_text_cluster_allocate (*num_clusters);
}
else if (clusters)
{
*clusters = nullptr;
*num_clusters = 0;
*cluster_flags = (cairo_text_cluster_flags_t) 0;
}
if ((*num_glyphs && !*glyphs) ||
(clusters && *num_clusters && !*clusters))
{
if (*glyphs)
{
cairo_glyph_free (*glyphs);
*glyphs = nullptr;
*num_glyphs = 0;
}
if (clusters && *clusters)
{
cairo_text_cluster_free (*clusters);
*clusters = nullptr;
*num_clusters = 0;
*cluster_flags = (cairo_text_cluster_flags_t) 0;
}
return;
}
double iscale = scale_factor ? 1. / scale_factor : 0.;
hb_position_t x = 0, y = 0;
int i;
for (i = 0; i < (int) *num_glyphs; i++)
{
(*glyphs)[i].index = hb_glyph[i].codepoint;
(*glyphs)[i].x = (+hb_position->x_offset + x) * iscale;
(*glyphs)[i].y = (-hb_position->y_offset + y) * iscale;
x += hb_position->x_advance;
y += -hb_position->y_advance;
hb_position++;
}
(*glyphs)[i].index = -1;
(*glyphs)[i].x = x * iscale;
(*glyphs)[i].y = y * iscale;
if (*num_clusters)
{
memset ((void *) *clusters, 0, *num_clusters * sizeof ((*clusters)[0]));
hb_bool_t backward = HB_DIRECTION_IS_BACKWARD (hb_buffer_get_direction (buffer));
*cluster_flags = backward ? CAIRO_TEXT_CLUSTER_FLAG_BACKWARD : (cairo_text_cluster_flags_t) 0;
unsigned int cluster = 0;
const char *start = text, *end;
(*clusters)[cluster].num_glyphs++;
if (backward)
{
for (i = *num_glyphs - 2; i >= 0; i--)
{
if (hb_glyph[i].cluster != hb_glyph[i+1].cluster)
{
assert (hb_glyph[i].cluster > hb_glyph[i+1].cluster);
if (utf8_clusters)
end = start + hb_glyph[i].cluster - hb_glyph[i+1].cluster;
else
end = (const char *) hb_utf_offset_to_pointer<hb_utf8_t> ((const uint8_t *) start,
(signed) (hb_glyph[i].cluster - hb_glyph[i+1].cluster));
(*clusters)[cluster].num_bytes = end - start;
start = end;
cluster++;
}
(*clusters)[cluster].num_glyphs++;
}
(*clusters)[cluster].num_bytes = text + text_len - start;
}
else
{
for (i = 1; i < (int) *num_glyphs; i++)
{
if (hb_glyph[i].cluster != hb_glyph[i-1].cluster)
{
assert (hb_glyph[i].cluster > hb_glyph[i-1].cluster);
if (utf8_clusters)
end = start + hb_glyph[i].cluster - hb_glyph[i-1].cluster;
else
end = (const char *) hb_utf_offset_to_pointer<hb_utf8_t> ((const uint8_t *) start,
(signed) (hb_glyph[i].cluster - hb_glyph[i-1].cluster));
(*clusters)[cluster].num_bytes = end - start;
start = end;
cluster++;
}
(*clusters)[cluster].num_glyphs++;
}
(*clusters)[cluster].num_bytes = text + text_len - start;
}
}
}
#endif
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