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cairo/src/cairo-colr-glyph-render.c
Adrian Johnson 8da24bf7fb Make _cairo_calloc() consistent with _cairo_malloc() 
ie

  _cairo_calloc(size)
  _cairo_calloc_ab(a, size)
2024-06-21 08:53:01 +09:30

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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2022 Matthias Clasen
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* Contributor(s):
* Matthias Clasen <mclasen@redhat.com>
*/
#include "cairoint.h"
#include "cairo-array-private.h"
#include "cairo-ft-private.h"
#include "cairo-path-private.h"
#include "cairo-pattern-private.h"
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#ifdef _MSC_VER
#include <malloc.h>
#endif
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#if HAVE_FT_COLR_V1
#include <ft2build.h>
#include FT_CONFIG_OPTIONS_H
#include FT_COLOR_H
#include FT_GLYPH_H
#include FT_OUTLINE_H
#include FT_SIZES_H
/* #define DEBUG_COLR 1 */
typedef struct _cairo_colr_glyph_render {
FT_Face face;
FT_Color *palette;
unsigned int num_palette_entries;
cairo_pattern_t *foreground_marker;
cairo_pattern_t *foreground_source;
cairo_bool_t foreground_source_used;
int level;
} cairo_colr_glyph_render_t;
static cairo_status_t
draw_paint (cairo_colr_glyph_render_t *render,
FT_OpaquePaint *paint,
cairo_t *cr);
static inline double
double_from_16_16 (FT_Fixed f)
{
return f / (double) (1 << 16);
}
static inline double
double_from_26_6 (FT_F26Dot6 f)
{
return f / (double) (1 << 6);
}
static inline double
double_from_2_14 (FT_F2Dot14 f)
{
return f / (double) (1 << 14);
}
static inline double
interpolate (double f0, double f1, double f)
{
return f0 + f * (f1 - f0);
}
static inline void
interpolate_points (cairo_point_double_t *p0,
cairo_point_double_t *p1,
double f,
cairo_point_double_t *out)
{
out->x = interpolate (p0->x, p1->x, f);
out->y = interpolate (p0->y, p1->y, f);
}
static inline void
interpolate_colors (cairo_color_t *c0,
cairo_color_t *c1,
double f,
cairo_color_t *out)
{
out->red = interpolate (c0->red, c1->red, f);
out->green = interpolate (c0->green, c1->green, f);
out->blue = interpolate (c0->blue, c1->blue, f);
out->alpha = interpolate (c0->alpha, c1->alpha, f);
}
static inline double
dot (cairo_point_double_t p, cairo_point_double_t q)
{
return p.x * q.x + p.y * q.y;
}
static inline cairo_point_double_t
normalize (cairo_point_double_t p)
{
double len = sqrt (dot (p, p));
return (cairo_point_double_t) { p.x / len, p.y / len };
}
static inline cairo_point_double_t
sum (cairo_point_double_t p, cairo_point_double_t q)
{
return (cairo_point_double_t) { p.x + q.x, p.y + q.y };
}
static inline cairo_point_double_t
difference (cairo_point_double_t p, cairo_point_double_t q)
{
return (cairo_point_double_t) { p.x - q.x, p.y - q.y };
}
static inline cairo_point_double_t
scale (cairo_point_double_t p, double f)
{
return (cairo_point_double_t) { p.x * f, p.y * f };
}
static cairo_operator_t
cairo_operator_from_ft_composite_mode (FT_Composite_Mode mode)
{
switch (mode)
{
case FT_COLR_COMPOSITE_CLEAR: return CAIRO_OPERATOR_CLEAR;
case FT_COLR_COMPOSITE_SRC: return CAIRO_OPERATOR_SOURCE;
case FT_COLR_COMPOSITE_DEST: return CAIRO_OPERATOR_DEST;
case FT_COLR_COMPOSITE_SRC_OVER: return CAIRO_OPERATOR_OVER;
case FT_COLR_COMPOSITE_DEST_OVER: return CAIRO_OPERATOR_DEST_OVER;
case FT_COLR_COMPOSITE_SRC_IN: return CAIRO_OPERATOR_IN;
case FT_COLR_COMPOSITE_DEST_IN: return CAIRO_OPERATOR_DEST_IN;
case FT_COLR_COMPOSITE_SRC_OUT: return CAIRO_OPERATOR_OUT;
case FT_COLR_COMPOSITE_DEST_OUT: return CAIRO_OPERATOR_DEST_OUT;
case FT_COLR_COMPOSITE_SRC_ATOP: return CAIRO_OPERATOR_ATOP;
case FT_COLR_COMPOSITE_DEST_ATOP: return CAIRO_OPERATOR_DEST_ATOP;
case FT_COLR_COMPOSITE_XOR: return CAIRO_OPERATOR_XOR;
case FT_COLR_COMPOSITE_PLUS: return CAIRO_OPERATOR_ADD;
case FT_COLR_COMPOSITE_SCREEN: return CAIRO_OPERATOR_SCREEN;
case FT_COLR_COMPOSITE_OVERLAY: return CAIRO_OPERATOR_OVERLAY;
case FT_COLR_COMPOSITE_DARKEN: return CAIRO_OPERATOR_DARKEN;
case FT_COLR_COMPOSITE_LIGHTEN: return CAIRO_OPERATOR_LIGHTEN;
case FT_COLR_COMPOSITE_COLOR_DODGE: return CAIRO_OPERATOR_COLOR_DODGE;
case FT_COLR_COMPOSITE_COLOR_BURN: return CAIRO_OPERATOR_COLOR_BURN;
case FT_COLR_COMPOSITE_HARD_LIGHT: return CAIRO_OPERATOR_HARD_LIGHT;
case FT_COLR_COMPOSITE_SOFT_LIGHT: return CAIRO_OPERATOR_SOFT_LIGHT;
case FT_COLR_COMPOSITE_DIFFERENCE: return CAIRO_OPERATOR_DIFFERENCE;
case FT_COLR_COMPOSITE_EXCLUSION: return CAIRO_OPERATOR_EXCLUSION;
case FT_COLR_COMPOSITE_MULTIPLY: return CAIRO_OPERATOR_MULTIPLY;
case FT_COLR_COMPOSITE_HSL_HUE: return CAIRO_OPERATOR_HSL_HUE;
case FT_COLR_COMPOSITE_HSL_SATURATION: return CAIRO_OPERATOR_HSL_SATURATION;
case FT_COLR_COMPOSITE_HSL_COLOR: return CAIRO_OPERATOR_HSL_COLOR;
case FT_COLR_COMPOSITE_HSL_LUMINOSITY: return CAIRO_OPERATOR_HSL_LUMINOSITY;
case FT_COLR_COMPOSITE_MAX:
default:
ASSERT_NOT_REACHED;
}
}
static cairo_extend_t
cairo_extend_from_ft_paint_extend (FT_PaintExtend extend)
{
switch (extend)
{
case FT_COLR_PAINT_EXTEND_PAD: return CAIRO_EXTEND_PAD;
case FT_COLR_PAINT_EXTEND_REPEAT: return CAIRO_EXTEND_REPEAT;
case FT_COLR_PAINT_EXTEND_REFLECT: return CAIRO_EXTEND_REFLECT;
default:
ASSERT_NOT_REACHED;
}
}
static cairo_status_t
draw_paint_colr_layers (cairo_colr_glyph_render_t *render,
FT_PaintColrLayers *colr_layers,
cairo_t *cr)
{
FT_OpaquePaint paint;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintColrLayers\n", 2 * render->level, "");
#endif
while (FT_Get_Paint_Layers (render->face, &colr_layers->layer_iterator, &paint)) {
cairo_push_group (cr);
status = draw_paint (render, &paint, cr);
cairo_pop_group_to_source (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_paint (cr);
if (unlikely (status))
break;
}
return status;
}
static void
get_palette_color (cairo_colr_glyph_render_t *render,
FT_ColorIndex *ci,
cairo_color_t *color,
double *colr_alpha,
cairo_bool_t *is_foreground_color)
{
cairo_bool_t foreground = FALSE;
if (ci->palette_index == 0xffff || ci->palette_index >= render->num_palette_entries) {
color->red = 0;
color->green = 0;
color->blue = 0;
color->alpha = 1;
foreground = TRUE;
} else {
FT_Color c = render->palette[ci->palette_index];
color->red = c.red / 255.0;
color->green = c.green / 255.0;
color->blue = c.blue / 255.0;
color->alpha = c.alpha / 255.0;
}
*colr_alpha = double_from_2_14 (ci->alpha);
*is_foreground_color = foreground;
}
static cairo_status_t
draw_paint_solid (cairo_colr_glyph_render_t *render,
FT_PaintSolid *solid,
cairo_t *cr)
{
cairo_color_t color;
double colr_alpha;
cairo_bool_t is_foreground_color;
#if DEBUG_COLR
printf ("%*sDraw PaintSolid\n", 2 * render->level, "");
#endif
get_palette_color (render, &solid->color, &color, &colr_alpha, &is_foreground_color);
if (is_foreground_color) {
cairo_set_source (cr, render->foreground_marker);
cairo_paint_with_alpha (cr, colr_alpha);
} else {
cairo_set_source_rgba (cr, color.red, color.green, color.blue, color.alpha * colr_alpha);
cairo_paint (cr);
}
return CAIRO_STATUS_SUCCESS;
}
typedef struct _cairo_colr_color_stop {
cairo_color_t color;
double position;
} cairo_colr_color_stop_t;
typedef struct _cairo_colr_color_line {
int n_stops;
cairo_colr_color_stop_t *stops;
} cairo_colr_color_line_t;
static void
free_colorline (cairo_colr_color_line_t *cl)
{
free (cl->stops);
free (cl);
}
static int
_compare_stops (const void *p1, const void *p2)
{
const cairo_colr_color_stop_t *c1 = p1;
const cairo_colr_color_stop_t *c2 = p2;
if (c1->position < c2->position)
return -1;
else if (c1->position > c2->position)
return 1;
else
return 0;
}
static cairo_colr_color_line_t *
read_colorline (cairo_colr_glyph_render_t *render,
FT_ColorLine *colorline)
{
cairo_colr_color_line_t *cl;
FT_ColorStop stop;
int i;
double colr_alpha;
cairo_bool_t is_foreground_color;
cl = _cairo_calloc (sizeof (cairo_colr_color_line_t));
if (unlikely (cl == NULL))
return NULL;
cl->n_stops = colorline->color_stop_iterator.num_color_stops;
cl->stops = _cairo_calloc_ab (cl->n_stops, sizeof (cairo_colr_color_stop_t));
if (unlikely (cl->stops == NULL)) {
free (cl);
return NULL;
}
i = 0;
while (FT_Get_Colorline_Stops (render->face, &stop, &colorline->color_stop_iterator)) {
cl->stops[i].position = double_from_16_16 (stop.stop_offset);
get_palette_color (render, &stop.color, &cl->stops[i].color, &colr_alpha, &is_foreground_color);
if (is_foreground_color) {
double red, green, blue, alpha;
if (cairo_pattern_get_rgba (render->foreground_source,
&red, &green, &blue, &alpha) == CAIRO_STATUS_SUCCESS)
{
cl->stops[i].color.red = red;
cl->stops[i].color.green = green;
cl->stops[i].color.blue = blue;
cl->stops[i].color.alpha = alpha * colr_alpha;
render->foreground_source_used = TRUE;
}
else
{
cl->stops[i].color.red = 0;
cl->stops[i].color.green = 0;
cl->stops[i].color.blue = 0;
cl->stops[i].color.alpha = colr_alpha;
}
} else {
cl->stops[i].color.alpha *= colr_alpha;
}
i++;
}
qsort (cl->stops, cl->n_stops, sizeof (cairo_colr_color_stop_t), _compare_stops);
return cl;
}
static void
reduce_anchors (FT_PaintLinearGradient *gradient,
cairo_point_double_t *pp0,
cairo_point_double_t *pp1)
{
cairo_point_double_t p0, p1, p2;
cairo_point_double_t q1, q2;
double s;
double k;
p0.x = double_from_16_16 (gradient->p0.x);
p0.y = double_from_16_16 (gradient->p0.y);
p1.x = double_from_16_16 (gradient->p1.x);
p1.y = double_from_16_16 (gradient->p1.y);
p2.x = double_from_16_16 (gradient->p2.x);
p2.y = double_from_16_16 (gradient->p2.y);
q2.x = p2.x - p0.x;
q2.y = p2.y - p0.y;
q1.x = p1.x - p0.x;
q1.y = p1.y - p0.y;
s = q2.x * q2.x + q2.y * q2.y;
if (s < 0.000001)
{
pp0->x = p0.x; pp0->y = p0.y;
pp1->x = p1.x; pp1->y = p1.y;
return;
}
k = (q2.x * q1.x + q2.y * q1.y) / s;
pp0->x = p0.x;
pp0->y = p0.y;
pp1->x = p1.x - k * q2.x;
pp1->y = p1.y - k * q2.y;
}
static void
normalize_colorline (cairo_colr_color_line_t *cl,
double *out_min,
double *out_max)
{
double min, max;
*out_min = 0.;
*out_max = 1.;
min = max = cl->stops[0].position;
for (int i = 0; i < cl->n_stops; i++) {
cairo_colr_color_stop_t *stop = &cl->stops[i];
min = MIN (min, stop->position);
max = MAX (max, stop->position);
}
if (min != max) {
for (int i = 0; i < cl->n_stops; i++) {
cairo_colr_color_stop_t *stop = &cl->stops[i];
stop->position = (stop->position - min) / (max - min);
}
*out_min = min;
*out_max = max;
}
}
static cairo_status_t
draw_paint_linear_gradient (cairo_colr_glyph_render_t *render,
FT_PaintLinearGradient *gradient,
cairo_t *cr)
{
cairo_colr_color_line_t *cl;
cairo_point_double_t p0, p1;
cairo_point_double_t pp0, pp1;
cairo_pattern_t *pattern;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
double min, max;
#if DEBUG_COLR
printf ("%*sDraw PaintLinearGradient\n", 2 * render->level, "");
#endif
cl = read_colorline (render, &gradient->colorline);
if (unlikely (cl == NULL))
return CAIRO_STATUS_NO_MEMORY;
/* cairo only allows stop positions between 0 and 1 */
normalize_colorline (cl, &min, &max);
reduce_anchors (gradient, &p0, &p1);
interpolate_points (&p0, &p1, min, &pp0);
interpolate_points (&p0, &p1, max, &pp1);
pattern = cairo_pattern_create_linear (pp0.x, pp0.y, pp1.x, pp1.y);
cairo_pattern_set_extend (pattern, cairo_extend_from_ft_paint_extend (gradient->colorline.extend));
for (int i = 0; i < cl->n_stops; i++) {
cairo_colr_color_stop_t *stop = &cl->stops[i];
cairo_pattern_add_color_stop_rgba (pattern, stop->position,
stop->color.red, stop->color.green, stop->color.blue, stop->color.alpha);
}
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
free_colorline (cl);
return status;
}
static cairo_status_t
draw_paint_radial_gradient (cairo_colr_glyph_render_t *render,
FT_PaintRadialGradient *gradient,
cairo_t *cr)
{
cairo_colr_color_line_t *cl;
cairo_point_double_t start, end;
cairo_point_double_t start1, end1;
double start_radius, end_radius;
double start_radius1, end_radius1;
double min, max;
cairo_pattern_t *pattern;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintRadialGradient\n", 2 * render->level, "");
#endif
cl = read_colorline (render, &gradient->colorline);
if (unlikely (cl == NULL))
return CAIRO_STATUS_NO_MEMORY;
start.x = double_from_16_16 (gradient->c0.x);
start.y = double_from_16_16 (gradient->c0.y);
end.x = double_from_16_16 (gradient->c1.x);
end.y = double_from_16_16 (gradient->c1.y);
start_radius = double_from_16_16 (gradient->r0);
end_radius = double_from_16_16 (gradient->r1);
/* cairo only allows stop positions between 0 and 1 */
normalize_colorline (cl, &min, &max);
interpolate_points (&start, &end, min, &start1);
interpolate_points (&start, &end, max, &end1);
start_radius1 = interpolate (start_radius, end_radius, min);
end_radius1 = interpolate (start_radius, end_radius, max);
pattern = cairo_pattern_create_radial (start1.x, start1.y, start_radius1,
end1.x, end1.y, end_radius1);
cairo_pattern_set_extend (pattern, cairo_extend_from_ft_paint_extend (gradient->colorline.extend));
for (int i = 0; i < cl->n_stops; i++) {
cairo_colr_color_stop_t *stop = &cl->stops[i];
cairo_pattern_add_color_stop_rgba (pattern, stop->position,
stop->color.red, stop->color.green, stop->color.blue, stop->color.alpha);
}
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
free_colorline (cl);
return status;
}
typedef struct {
cairo_point_double_t center, p0, c0, c1, p1;
cairo_color_t color0, color1;
} cairo_colr_gradient_patch_t;
static void
add_patch (cairo_pattern_t *pattern,
cairo_point_double_t *center,
cairo_colr_gradient_patch_t *p)
{
cairo_mesh_pattern_begin_patch (pattern);
cairo_mesh_pattern_move_to (pattern, center->x, center->y);
cairo_mesh_pattern_line_to (pattern, p->p0.x, p->p0.y);
cairo_mesh_pattern_curve_to (pattern,
p->c0.x, p->c0.y,
p->c1.x, p->c1.y,
p->p1.x, p->p1.y);
cairo_mesh_pattern_line_to (pattern, center->x, center->y);
cairo_mesh_pattern_set_corner_color_rgba (pattern, 0,
p->color0.red,
p->color0.green,
p->color0.blue,
p->color0.alpha);
cairo_mesh_pattern_set_corner_color_rgba (pattern, 1,
p->color0.red,
p->color0.green,
p->color0.blue,
p->color0.alpha);
cairo_mesh_pattern_set_corner_color_rgba (pattern, 2,
p->color1.red,
p->color1.green,
p->color1.blue,
p->color1.alpha);
cairo_mesh_pattern_set_corner_color_rgba (pattern, 3,
p->color1.red,
p->color1.green,
p->color1.blue,
p->color1.alpha);
cairo_mesh_pattern_end_patch (pattern);
}
#define MAX_ANGLE (M_PI / 8.)
static void
add_sweep_gradient_patches1 (cairo_point_double_t *center,
double radius,
double a0,
cairo_color_t *c0,
double a1,
cairo_color_t *c1,
cairo_pattern_t *pattern)
{
int num_splits;
cairo_point_double_t p0;
cairo_color_t color0, color1;
num_splits = ceilf (fabs (a1 - a0) / MAX_ANGLE);
p0 = (cairo_point_double_t) { cosf (a0), sinf (a0) };
color0 = *c0;
for (int a = 0; a < num_splits; a++) {
double k = (a + 1.) / num_splits;
double angle1;
cairo_point_double_t p1;
cairo_point_double_t A, U;
cairo_point_double_t C0, C1;
cairo_colr_gradient_patch_t patch;
angle1 = interpolate (a0, a1, k);
interpolate_colors (c0, c1, k, &color1);
patch.color0 = color0;
patch.color1 = color1;
p1 = (cairo_point_double_t) { cosf (angle1), sinf (angle1) };
patch.p0 = sum (*center, scale (p0, radius));
patch.p1 = sum (*center, scale (p1, radius));
A = normalize (sum (p0, p1));
U = (cairo_point_double_t) { -A.y, A.x };
C0 = sum (A, scale (U, dot (difference (p0, A), p0) / dot (U, p0)));
C1 = sum (A, scale (U, dot (difference (p1, A), p1) / dot (U, p1)));
patch.c0 = sum (*center, scale (sum (C0, scale (difference (C0, p0), 0.33333)), radius));
patch.c1 = sum (*center, scale (sum (C1, scale (difference (C1, p1), 0.33333)), radius));
add_patch (pattern, center, &patch);
p0 = p1;
color0 = color1;
}
}
static void
add_sweep_gradient_patches (cairo_colr_color_line_t *cl,
cairo_extend_t extend,
cairo_point_double_t *center,
double radius,
double start_angle,
double end_angle,
cairo_pattern_t *pattern)
{
double *angles;
cairo_color_t color0, color1;
if (start_angle == end_angle) {
if (extend == CAIRO_EXTEND_PAD) {
if (start_angle > 0)
add_sweep_gradient_patches1 (center, radius,
0., &cl->stops[0].color,
start_angle, &cl->stops[0].color,
pattern);
if (end_angle < 2 * M_PI)
add_sweep_gradient_patches1 (center, radius,
end_angle, &cl->stops[cl->n_stops - 1].color,
2 * M_PI, &cl->stops[cl->n_stops - 1].color,
pattern);
}
return;
}
assert (start_angle != end_angle);
angles = alloca (sizeof (double) * cl->n_stops);
for (int i = 0; i < cl->n_stops; i++)
angles[i] = start_angle + cl->stops[i].position * (end_angle - start_angle);
/* handle directions */
if (end_angle < start_angle) {
for (int i = 0; i < cl->n_stops - 1 - i; i++) {
cairo_colr_color_stop_t stop = cl->stops[i];
double a = angles[i];
cl->stops[i] = cl->stops[cl->n_stops - 1 - i];
cl->stops[cl->n_stops - 1 - i] = stop;
angles[i] = angles[cl->n_stops - 1 - i];
angles[cl->n_stops - 1 - i] = a;
}
}
if (extend == CAIRO_EXTEND_PAD)
{
int pos;
color0 = cl->stops[0].color;
for (pos = 0; pos < cl->n_stops; pos++) {
if (angles[pos] >= 0) {
if (pos > 0) {
double k = (0 - angles[pos - 1]) / (angles[pos] - angles[pos - 1]);
interpolate_colors (&cl->stops[pos - 1].color, &cl->stops[pos].color, k, &color0);
}
break;
}
}
if (pos == cl->n_stops) {
/* everything is below 0 */
color0 = cl->stops[cl->n_stops - 1].color;
add_sweep_gradient_patches1 (center, radius,
0., &color0,
2 * M_PI, &color0,
pattern);
return;
}
add_sweep_gradient_patches1 (center, radius,
0., &color0,
angles[pos], &cl->stops[pos].color,
pattern);
for (pos++; pos < cl->n_stops; pos++) {
if (angles[pos] <= 2 * M_PI) {
add_sweep_gradient_patches1 (center, radius,
angles[pos - 1], &cl->stops[pos - 1].color,
angles[pos], &cl->stops[pos].color,
pattern);
} else {
double k = (2 * M_PI - angles[pos - 1]) / (angles[pos] - angles[pos - 1]);
interpolate_colors (&cl->stops[pos - 1].color, &cl->stops[pos].color, k, &color1);
add_sweep_gradient_patches1 (center, radius,
angles[pos - 1], &cl->stops[pos - 1].color,
2 * M_PI, &color1,
pattern);
break;
}
}
if (pos == cl->n_stops) {
/* everything is below 2*M_PI */
color0 = cl->stops[cl->n_stops - 1].color;
add_sweep_gradient_patches1 (center, radius,
angles[cl->n_stops - 1], &color0,
2 * M_PI, &color0,
pattern);
return;
}
} else {
int k;
double span;
span = angles[cl->n_stops - 1] - angles[0];
k = 0;
if (angles[0] >= 0) {
double ss = angles[0];
while (ss > 0) {
if (span > 0) {
ss -= span;
k--;
} else {
ss += span;
k++;
}
}
}
else if (angles[0] < 0)
{
double ee = angles[cl->n_stops - 1];
while (ee < 0) {
if (span > 0) {
ee += span;
k++;
} else {
ee -= span;
k--;
}
}
}
//assert (angles[0] + k * span <= 0 && 0 < angles[cl->n_stops - 1] + k * span);
for (int l = k; TRUE; l++) {
for (int i = 1; i < cl->n_stops; i++) {
double a0, a1;
cairo_color_t *c0, *c1;
if ((l % 2 != 0) && (extend == CAIRO_EXTEND_REFLECT)) {
a0 = angles[0] + angles[cl->n_stops - 1] - angles[cl->n_stops - 1 - (i-1)] + l * span;
a1 = angles[0] + angles[cl->n_stops - 1] - angles[cl->n_stops - 1 - i] + l * span;
c0 = &cl->stops[cl->n_stops - 1 - (i-1)].color;
c1 = &cl->stops[cl->n_stops - 1 - i].color;
} else {
a0 = angles[i-1] + l * span;
a1 = angles[i] + l * span;
c0 = &cl->stops[i-1].color;
c1 = &cl->stops[i].color;
}
if (a1 < 0)
continue;
if (a0 < 0) {
cairo_color_t color;
double f = (0 - a0)/(a1 - a0);
interpolate_colors (c0, c1, f, &color);
add_sweep_gradient_patches1 (center, radius,
0, &color,
a1, c1,
pattern);
} else if (a1 >= 2 * M_PI) {
cairo_color_t color;
double f = (2 * M_PI - a0)/(a1 - a0);
interpolate_colors (c0, c1, f, &color);
add_sweep_gradient_patches1 (center, radius,
a0, c0,
2 * M_PI, &color,
pattern);
return;
} else {
add_sweep_gradient_patches1 (center, radius,
a0, c0,
a1, c1,
pattern);
}
}
}
}
}
static cairo_status_t
draw_paint_sweep_gradient (cairo_colr_glyph_render_t *render,
FT_PaintSweepGradient *gradient,
cairo_t *cr)
{
cairo_colr_color_line_t *cl;
cairo_point_double_t center;
double start_angle, end_angle;
double x1, y1, x2, y2;
double max_x, max_y, R;
cairo_pattern_t *pattern;
cairo_extend_t extend;
#if DEBUG_COLR
printf ("%*sDraw PaintSweepGradient\n", 2 * render->level, "");
#endif
cl = read_colorline (render, &gradient->colorline);
if (unlikely (cl == NULL))
return CAIRO_STATUS_NO_MEMORY;
center.x = double_from_16_16 (gradient->center.x);
center.y = double_from_16_16 (gradient->center.y);
start_angle = (double_from_16_16 (gradient->start_angle) + 1) * M_PI;
end_angle = (double_from_16_16 (gradient->end_angle) + 1) * M_PI;
pattern = cairo_pattern_create_mesh ();
cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
max_x = MAX ((x1 - center.x) * (x1 - center.x), (x2 - center.x) * (x2 - center.x));
max_y = MAX ((y1 - center.y) * (y1 - center.y), (y2 - center.y) * (y2 - center.y));
R = sqrt (max_x + max_y);
extend = cairo_extend_from_ft_paint_extend (gradient->colorline.extend);
add_sweep_gradient_patches (cl, extend, &center, R, start_angle, end_angle, pattern);
cairo_set_source (cr, pattern);
cairo_paint (cr);
cairo_pattern_destroy (pattern);
free_colorline (cl);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
draw_paint_glyph (cairo_colr_glyph_render_t *render,
FT_PaintGlyph *glyph,
cairo_t *cr)
{
cairo_path_fixed_t *path_fixed;
cairo_path_t *path;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
FT_Error error;
#if DEBUG_COLR
printf ("%*sDraw PaintGlyph\n", 2 * render->level, "");
#endif
error = FT_Load_Glyph (render->face, glyph->glyphID, FT_LOAD_DEFAULT);
status = _cairo_ft_to_cairo_error (error);
if (unlikely (status))
return status;
status = _cairo_ft_face_decompose_glyph_outline (render->face, &path_fixed);
if (unlikely (status))
return status;
cairo_save (cr);
cairo_identity_matrix (cr);
path = _cairo_path_create (path_fixed, cr);
_cairo_path_fixed_destroy (path_fixed);
cairo_restore (cr);
cairo_save (cr);
cairo_new_path (cr);
cairo_append_path (cr, path);
cairo_path_destroy (path);
cairo_clip (cr);
status = draw_paint (render, &glyph->paint, cr);
cairo_restore (cr);
return status;
}
static cairo_status_t draw_colr_glyph (cairo_colr_glyph_render_t *render,
unsigned long glyph,
FT_Color_Root_Transform root,
cairo_t *cr);
static cairo_status_t
draw_paint_colr_glyph (cairo_colr_glyph_render_t *render,
FT_PaintColrGlyph *colr_glyph,
cairo_t *cr)
{
#if DEBUG_COLR
printf ("%*sDraw PaintColrGlyph\n", 2 * render->level, "");
#endif
return draw_colr_glyph (render, colr_glyph->glyphID, FT_COLOR_NO_ROOT_TRANSFORM, cr);
}
static cairo_status_t
draw_paint_transform (cairo_colr_glyph_render_t *render,
FT_PaintTransform *transform,
cairo_t *cr)
{
cairo_matrix_t t;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintTransform\n", 2 * render->level, "");
#endif
cairo_matrix_init (&t,
double_from_16_16 (transform->affine.xx),
double_from_16_16 (transform->affine.yx),
double_from_16_16 (transform->affine.xy),
double_from_16_16 (transform->affine.yy),
double_from_16_16 (transform->affine.dx),
double_from_16_16 (transform->affine.dy));
cairo_save (cr);
cairo_transform (cr, &t);
status = draw_paint (render, &transform->paint, cr);
cairo_restore (cr);
return status;
}
static cairo_status_t
draw_paint_translate (cairo_colr_glyph_render_t *render,
FT_PaintTranslate *translate,
cairo_t *cr)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintTranslate\n", 2 * render->level, "");
#endif
cairo_save (cr);
cairo_translate (cr, double_from_16_16 (translate->dx), double_from_16_16 (translate->dy));
status = draw_paint (render, &translate->paint, cr);
cairo_restore (cr);
return status;
}
static cairo_status_t
draw_paint_rotate (cairo_colr_glyph_render_t *render,
FT_PaintRotate *rotate,
cairo_t *cr)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintRotate\n", 2 * render->level, "");
#endif
cairo_save (cr);
cairo_translate (cr, double_from_16_16 (rotate->center_x), double_from_16_16 (rotate->center_y));
cairo_rotate (cr, double_from_16_16 (rotate->angle) * M_PI);
cairo_translate (cr, - double_from_16_16 (rotate->center_x), - double_from_16_16 (rotate->center_y));
status = draw_paint (render, &rotate->paint, cr);
cairo_restore (cr);
return status;
}
static cairo_status_t
draw_paint_scale (cairo_colr_glyph_render_t *render,
FT_PaintScale *scale,
cairo_t *cr)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintScale\n", 2 * render->level, "");
#endif
cairo_save (cr);
cairo_translate (cr, double_from_16_16 (scale->center_x), double_from_16_16 (scale->center_y));
cairo_scale (cr, double_from_16_16 (scale->scale_x), double_from_16_16 (scale->scale_y));
cairo_translate (cr, - double_from_16_16 (scale->center_x), - double_from_16_16 (scale->center_y));
status = draw_paint (render, &scale->paint, cr);
cairo_restore (cr);
return status;
}
static cairo_status_t
draw_paint_skew (cairo_colr_glyph_render_t *render,
FT_PaintSkew *skew,
cairo_t *cr)
{
cairo_matrix_t s;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintSkew\n", 2 * render->level, "");
#endif
cairo_save (cr);
cairo_translate (cr, double_from_16_16 (skew->center_x), double_from_16_16 (skew->center_y));
cairo_matrix_init (&s, 1., tan (double_from_16_16 (skew->y_skew_angle) * M_PI), - tan (double_from_16_16 (skew->x_skew_angle) * M_PI), 1., 0., 0.);
cairo_transform (cr, &s);
cairo_translate (cr, - double_from_16_16 (skew->center_x), - double_from_16_16 (skew->center_y));
status = draw_paint (render, &skew->paint, cr);
cairo_restore (cr);
return status;
}
static cairo_status_t
draw_paint_composite (cairo_colr_glyph_render_t *render,
FT_PaintComposite *composite,
cairo_t *cr)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
#if DEBUG_COLR
printf ("%*sDraw PaintComposite\n", 2 * render->level, "");
#endif
cairo_save (cr);
status = draw_paint (render, &composite->backdrop_paint, cr);
if (unlikely (status)) {
cairo_pattern_destroy (cairo_pop_group (cr));
goto cleanup;
}
cairo_push_group (cr);
status = draw_paint (render, &composite->source_paint, cr);
if (unlikely (status)) {
cairo_pattern_destroy (cairo_pop_group (cr));
cairo_pattern_destroy (cairo_pop_group (cr));
goto cleanup;
}
cairo_pop_group_to_source (cr);
cairo_set_operator (cr, cairo_operator_from_ft_composite_mode (composite->composite_mode));
cairo_paint (cr);
cleanup:
cairo_restore (cr);
return status;
}
static cairo_status_t
draw_paint (cairo_colr_glyph_render_t *render,
FT_OpaquePaint *paint,
cairo_t *cr)
{
FT_COLR_Paint p;
FT_Size orig_size;
FT_Size unscaled_size;
FT_Matrix orig_transform;
FT_Vector orig_delta;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
assert (cairo_status (cr) == CAIRO_STATUS_SUCCESS);
if (!FT_Get_Paint (render->face, *paint, &p))
return CAIRO_STATUS_NO_MEMORY;
if (render->level == 0) {
/* Now that the FT_Get_Paint call has applied the root transform,
* make the face unscaled and untransformed, so we can load glyph
* contours.
*/
FT_Matrix transform;
FT_Vector delta;
orig_size = render->face->size;
FT_New_Size (render->face, &unscaled_size);
FT_Activate_Size (unscaled_size);
FT_Set_Char_Size (render->face, render->face->units_per_EM << 6, 0, 0, 0);
transform.xx = transform.yy = 1 << 16;
transform.xy = transform.yx = 0;
delta.x = delta.y = 0;
FT_Get_Transform (render->face, &orig_transform, &orig_delta);
FT_Set_Transform (render->face, &transform, &delta);
}
render->level++;
switch (p.format) {
case FT_COLR_PAINTFORMAT_COLR_LAYERS:
status = draw_paint_colr_layers (render, &p.u.colr_layers, cr);
break;
case FT_COLR_PAINTFORMAT_SOLID:
status = draw_paint_solid (render, &p.u.solid, cr);
break;
case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT:
status = draw_paint_linear_gradient (render, &p.u.linear_gradient, cr);
break;
case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT:
status = draw_paint_radial_gradient (render, &p.u.radial_gradient, cr);
break;
case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT:
status = draw_paint_sweep_gradient (render, &p.u.sweep_gradient, cr);
break;
case FT_COLR_PAINTFORMAT_GLYPH:
status = draw_paint_glyph (render, &p.u.glyph, cr);
break;
case FT_COLR_PAINTFORMAT_COLR_GLYPH:
status = draw_paint_colr_glyph (render, &p.u.colr_glyph, cr);
break;
case FT_COLR_PAINTFORMAT_TRANSFORM:
status = draw_paint_transform (render, &p.u.transform, cr);
break;
case FT_COLR_PAINTFORMAT_TRANSLATE:
status = draw_paint_translate (render, &p.u.translate, cr);
break;
case FT_COLR_PAINTFORMAT_ROTATE:
status = draw_paint_rotate (render, &p.u.rotate, cr);
break;
case FT_COLR_PAINTFORMAT_SCALE:
status = draw_paint_scale (render, &p.u.scale, cr);
break;
case FT_COLR_PAINTFORMAT_SKEW:
status = draw_paint_skew (render, &p.u.skew, cr);
break;
case FT_COLR_PAINTFORMAT_COMPOSITE:
status = draw_paint_composite (render, &p.u.composite, cr);
break;
case FT_COLR_PAINT_FORMAT_MAX:
case FT_COLR_PAINTFORMAT_UNSUPPORTED:
default:
ASSERT_NOT_REACHED;
}
render->level--;
if (render->level == 0) {
FT_Set_Transform (render->face, &orig_transform, &orig_delta);
FT_Activate_Size (orig_size);
FT_Done_Size (unscaled_size);
}
return status;
}
static cairo_status_t
draw_colr_glyph (cairo_colr_glyph_render_t *render,
unsigned long glyph,
FT_Color_Root_Transform root,
cairo_t *cr)
{
FT_OpaquePaint paint = { NULL, 0 };
FT_ClipBox box;
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_save (cr);
if (FT_Get_Color_Glyph_ClipBox (render->face, glyph, &box)) {
double xmin, ymin, xmax, ymax;
xmin = double_from_26_6 (box.bottom_left.x);
ymin = double_from_26_6 (box.bottom_left.y);
xmax = double_from_26_6 (box.top_right.x);
ymax = double_from_26_6 (box.top_right.y);
cairo_new_path (cr);
cairo_rectangle (cr, xmin, ymin, xmax - xmin, ymax - ymin);
cairo_clip (cr);
}
if (FT_Get_Color_Glyph_Paint (render->face, glyph, root, &paint))
status = draw_paint (render, &paint, cr);
cairo_restore (cr);
return status;
}
/* Create an image surface and render the glyph onto it,
* using the given colors.
*/
cairo_status_t
_cairo_render_colr_v1_glyph (FT_Face face,
unsigned long glyph,
FT_Color *palette,
int num_palette_entries,
cairo_t *cr,
cairo_pattern_t *foreground_source,
cairo_bool_t *foreground_source_used)
{
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_colr_glyph_render_t colr_render;
#if DEBUG_COLR
printf ("_cairo_render_colr_glyph glyph index: %ld\n", glyph);
#endif
colr_render.face = face;
colr_render.palette = palette;
colr_render.num_palette_entries = num_palette_entries;
colr_render.foreground_marker = _cairo_pattern_create_foreground_marker ();
colr_render.foreground_source = cairo_pattern_reference (foreground_source);;
colr_render.foreground_source_used = FALSE;
colr_render.level = 0;
status = draw_colr_glyph (&colr_render,
glyph,
FT_COLOR_INCLUDE_ROOT_TRANSFORM,
cr);
cairo_pattern_destroy (colr_render.foreground_marker);
cairo_pattern_destroy (colr_render.foreground_source);
*foreground_source_used = colr_render.foreground_source_used;
return status;
}
#endif /* HAVE_FT_COLR_V1 */
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