walkero
/
harfbuzz
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
harfbuzz/util/helper-cairo-user.hh

542 lines
15 KiB
C++
Raw Blame History

/*
* Copyright © 2022 Google, 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.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HELPER_CAIRO_USER_HH
#define HELPER_CAIRO_USER_HH
#include "config.h"
#include "font-options.hh"
#include <cairo.h>
#include <hb.h>
#include "hb-blob.hh"
#include "hb-cairo-utils.h"
static bool debug = false;
static int level = 0;
static void print (const char *format, ...) __attribute__((format (printf, 1, 2)));
static void
print (const char *format,
...)
{
va_list args;
if (!debug)
return;
printf ("%*s", 2 * level, "");
va_start (args, format);
vprintf (format, args);
va_end (args);
printf ("\n");
}
static const cairo_user_data_key_t _hb_font_cairo_user_data_key = {0};
static void
move_to (hb_draw_funcs_t *dfuncs,
cairo_t *cr,
hb_draw_state_t *st,
float to_x, float to_y,
void *)
{
print ("move to %f %f",
(double) to_x, (double) to_y);
cairo_move_to (cr,
(double) to_x, (double) to_y);
}
static void
line_to (hb_draw_funcs_t *dfuncs,
cairo_t *cr,
hb_draw_state_t *st,
float to_x, float to_y,
void *)
{
print ("line to %f %f",
(double) to_x, (double) to_y);
cairo_line_to (cr,
(double) to_x, (double) to_y);
}
static void
cubic_to (hb_draw_funcs_t *dfuncs,
cairo_t *cr,
hb_draw_state_t *st,
float control1_x, float control1_y,
float control2_x, float control2_y,
float to_x, float to_y,
void *)
{
print ("cubic to %f %f %f %f %f %f",
(double) control1_x, (double) control1_y,
(double) control2_x, (double) control2_y,
(double) to_x, (double) to_y);
cairo_curve_to (cr,
(double) control1_x, (double) control1_y,
(double) control2_x, (double) control2_y,
(double) to_x, (double) to_y);
}
static void
close_path (hb_draw_funcs_t *dfuncs,
cairo_t *cr,
hb_draw_state_t *st,
void *)
{
print ("close path");
cairo_close_path (cr);
}
static hb_draw_funcs_t *
get_cairo_draw_funcs (void)
{
static hb_draw_funcs_t *funcs;
if (!funcs)
{
funcs = hb_draw_funcs_create ();
hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr);
hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr);
hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr);
hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr);
}
return funcs;
}
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static void
push_transform (hb_paint_funcs_t *funcs,
void *paint_data,
float xx, float yx,
float xy, float yy,
float dx, float dy,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
cairo_matrix_t m;
print ("start transform %f %f %f %f %f %f",
(double) xx, (double) yx,
(double) xy, (double) yy,
(double) dx, (double) dy);
level++;
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
pop_transform (hb_paint_funcs_t *funcs,
void *paint_data,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
cairo_restore (cr);
level--;
print ("end transform");
}
static void
push_clip_glyph (hb_paint_funcs_t *funcs,
void *paint_data,
hb_codepoint_t glyph,
hb_font_t *font,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("start clip glyph %u", glyph);
level++;
cairo_save (cr);
cairo_new_path (cr);
hb_font_draw_glyph (font, glyph, get_cairo_draw_funcs (), cr);
cairo_close_path (cr);
cairo_clip (cr);
}
static void
push_clip_rectangle (hb_paint_funcs_t *funcs,
void *paint_data,
float xmin, float ymin, float xmax, float ymax,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("start clip rectangle %f %f %f %f",
(double) xmin, (double) ymin,
(double) xmax, (double) ymax);
level++;
cairo_save (cr);
cairo_rectangle (cr,
(double) xmin, (double) ymin,
(double) (xmax - xmin), (double) (ymax - ymin));
cairo_clip (cr);
}
static void
pop_clip (hb_paint_funcs_t *funcs,
void *paint_data,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
cairo_restore (cr);
level--;
print ("end clip");
}
static void
push_group (hb_paint_funcs_t *funcs,
void *paint_data,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("push group");
level++;
cairo_save (cr);
cairo_push_group (cr);
}
static void
pop_group (hb_paint_funcs_t *funcs,
void *paint_data,
hb_paint_composite_mode_t mode,
void *user_data)
{
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);
level--;
print ("pop group mode %d", mode);
}
static void
paint_color (hb_paint_funcs_t *funcs,
void *paint_data,
hb_bool_t use_foreground,
hb_color_t color,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("solid (fg %d) %d %d %d %d",
use_foreground,
hb_color_get_red (color),
hb_color_get_green (color),
hb_color_get_blue (color),
hb_color_get_alpha (color));
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 void
paint_image (hb_paint_funcs_t *funcs,
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)
{
cairo_t *cr = (cairo_t *)paint_data;
char buf[5] = { 0, };
hb_tag_to_string (format, buf);
print ("image type '%s' size %u %u slant %f extents %d %d %d %d",
buf, width, height, (double) slant,
extents->x_bearing, extents->y_bearing, extents->width, extents->height);
hb_cairo_paint_glyph_image (cr, blob, width, height, format, slant, extents);
}
static void
print_color_line (hb_color_line_t *color_line)
{
hb_color_stop_t *stops;
unsigned int len;
len = hb_color_line_get_color_stops (color_line, 0, NULL, NULL);
stops = (hb_color_stop_t *)alloca (len * sizeof (hb_color_stop_t));
hb_color_line_get_color_stops (color_line, 0, &len, stops);
print ("colors extend %d", hb_color_line_get_extend (color_line));
level += 1;
for (unsigned int i = 0; i < len; i++)
print ("%f (fg %d) %d %d %d %d",
(double) stops[i].offset,
stops[i].is_foreground,
hb_color_get_red (stops[i].color),
hb_color_get_green (stops[i].color),
hb_color_get_blue (stops[i].color),
hb_color_get_alpha (stops[i].color));
level -= 1;
}
static void
paint_linear_gradient (hb_paint_funcs_t *funcs,
void *paint_data,
hb_color_line_t *color_line,
float x0, float y0,
float x1, float y1,
float x2, float y2,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("linear gradient");
level += 1;
print ("p0 %f %f", (double) x0, (double) y0);
print ("p1 %f %f", (double) x1, (double) y1);
print ("p2 %f %f", (double) x2, (double) y2);
print_color_line (color_line);
level -= 1;
hb_cairo_paint_linear_gradient (cr, color_line, x0, y0, x1, y1, x2, y2);
}
static void
paint_radial_gradient (hb_paint_funcs_t *funcs,
void *paint_data,
hb_color_line_t *color_line,
float x0, float y0, float r0,
float x1, float y1, float r1,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("radial gradient");
level += 1;
print ("p0 %f %f radius %f", (double) x0, (double) y0, (double) r0);
print ("p1 %f %f radius %f", (double) x1, (double) y1, (double) r1);
print_color_line (color_line);
level -= 1;
hb_cairo_paint_radial_gradient (cr, color_line, x0, y0, r0, x1, y1, r1);
}
static void
paint_sweep_gradient (hb_paint_funcs_t *funcs,
void *paint_data,
hb_color_line_t *color_line,
float x0, float y0,
float start_angle, float end_angle,
void *user_data)
{
cairo_t *cr = (cairo_t *)paint_data;
print ("sweep gradient");
level++;
print ("center %f %f", (double) x0, (double) y0);
print ("angles %f %f", (double) start_angle, (double) end_angle);
print_color_line (color_line);
level--;
hb_cairo_paint_sweep_gradient (cr, color_line, x0, y0, start_angle, end_angle);
}
static hb_paint_funcs_t *
get_cairo_paint_funcs ()
{
static hb_paint_funcs_t *funcs;
if (!funcs)
{
funcs = hb_paint_funcs_create ();
hb_paint_funcs_set_push_transform_func (funcs, push_transform, nullptr, nullptr);
hb_paint_funcs_set_pop_transform_func (funcs, pop_transform, nullptr, nullptr);
hb_paint_funcs_set_push_clip_glyph_func (funcs, push_clip_glyph, nullptr, nullptr);
hb_paint_funcs_set_push_clip_rectangle_func (funcs, push_clip_rectangle, nullptr, nullptr);
hb_paint_funcs_set_pop_clip_func (funcs, pop_clip, nullptr, nullptr);
hb_paint_funcs_set_push_group_func (funcs, push_group, nullptr, nullptr);
hb_paint_funcs_set_pop_group_func (funcs, pop_group, nullptr, nullptr);
hb_paint_funcs_set_color_func (funcs, paint_color, nullptr, nullptr);
hb_paint_funcs_set_image_func (funcs, paint_image, nullptr, nullptr);
hb_paint_funcs_set_linear_gradient_func (funcs, paint_linear_gradient, nullptr, nullptr);
hb_paint_funcs_set_radial_gradient_func (funcs, paint_radial_gradient, nullptr, nullptr);
hb_paint_funcs_set_sweep_gradient_func (funcs, paint_sweep_gradient, nullptr, nullptr);
}
return funcs;
}
#endif
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static cairo_status_t
render_color_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents);
#endif
static cairo_status_t
render_glyph (cairo_scaled_font_t *scaled_font,
unsigned long glyph,
cairo_t *cr,
cairo_text_extents_t *extents)
{
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static char *p = getenv ("HB_DRAW");
if (p && atoi (p) >= 2)
return render_color_glyph (scaled_font, glyph, cr, extents);
#endif
hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&_hb_font_cairo_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, get_cairo_draw_funcs (), cr);
cairo_fill (cr);
return CAIRO_STATUS_SUCCESS;
}
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
static cairo_status_t
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_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&_hb_font_cairo_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);
if (getenv ("HB_PAINT_DEBUG"))
{
debug = atoi (getenv ("HB_PAINT_DEBUG"));
level = 0;
}
hb_font_paint_glyph (font, glyph, get_cairo_paint_funcs (), cr, palette, color);
return CAIRO_STATUS_SUCCESS;
}
#endif
static inline cairo_font_face_t *
helper_cairo_create_user_font_face (const font_options_t *font_opts)
{
cairo_font_face_t *cairo_face = cairo_user_font_face_create ();
cairo_font_face_set_user_data (cairo_face,
&_hb_font_cairo_user_data_key,
hb_font_reference (font_opts->font),
(cairo_destroy_func_t) hb_font_destroy);
cairo_user_font_face_set_render_glyph_func (cairo_face, render_glyph);
#ifdef HAVE_CAIRO_USER_FONT_FACE_SET_RENDER_COLOR_GLYPH_FUNC
hb_face_t *face = hb_font_get_face (font_opts->font);
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, render_color_glyph);
}
#endif
return cairo_face;
}
static inline bool
helper_cairo_user_font_face_has_data (cairo_font_face_t *font_face)
{
return cairo_font_face_get_user_data (font_face, &_hb_font_cairo_user_data_key);
}
static inline bool
helper_cairo_user_scaled_font_has_color (cairo_scaled_font_t *scaled_font)
{
/* Ignoring SVG for now, since we cannot render it. */
hb_font_t *font = (hb_font_t *) (cairo_font_face_get_user_data (cairo_scaled_font_get_font_face (scaled_font),
&_hb_font_cairo_user_data_key));
hb_face_t *face = hb_font_get_face (font);
return hb_ot_color_has_png (face) || hb_ot_color_has_layers (face) || hb_ot_color_has_paint (face);
}
#endif
Reference in New Issue View Git Blame Copy Permalink