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// SPDX-License-Identifier: GPL-2.0-or-later
#include "drawing-paintserver.h"
#include "cairo-utils.h"
namespace Inkscape {
DrawingPaintServer::~DrawingPaintServer() = default;
cairo_pattern_t *DrawingSolidColor::create_pattern(cairo_t *, Geom::OptRect const &, double opacity) const
{
return cairo_pattern_create_rgba(c[0], c[1], c[2], alpha * opacity);
}
void DrawingGradient::common_setup(cairo_pattern_t *pat, Geom::OptRect const &bbox, double opacity) const
{
// set spread type
switch (spread) {
case SP_GRADIENT_SPREAD_REFLECT:
cairo_pattern_set_extend(pat, CAIRO_EXTEND_REFLECT);
break;
case SP_GRADIENT_SPREAD_REPEAT:
cairo_pattern_set_extend(pat, CAIRO_EXTEND_REPEAT);
break;
case SP_GRADIENT_SPREAD_PAD:
default:
cairo_pattern_set_extend(pat, CAIRO_EXTEND_PAD);
break;
}
// set pattern transform matrix
auto gs2user = transform;
if (units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX && bbox) {
auto bbox2user = Geom::Affine(bbox->width(), 0, 0, bbox->height(), bbox->left(), bbox->top());
gs2user *= bbox2user;
}
ink_cairo_pattern_set_matrix(pat, gs2user.inverse());
}
cairo_pattern_t *DrawingLinearGradient::create_pattern(cairo_t *, Geom::OptRect const &bbox, double opacity) const
{
auto pat = cairo_pattern_create_linear(x1, y1, x2, y2);
common_setup(pat, bbox, opacity);
// add stops
for (auto &stop : stops) {
// multiply stop opacity by paint opacity
cairo_pattern_add_color_stop_rgba(pat, stop.offset, stop.color.v.c[0], stop.color.v.c[1], stop.color.v.c[2], stop.opacity * opacity);
}
return pat;
}
cairo_pattern_t *DrawingRadialGradient::create_pattern(cairo_t *ct, Geom::OptRect const &bbox, double opacity) const
{
Geom::Point focus(fx, fy);
Geom::Point center(cx, cy);
double radius = r;
double focusr = fr;
double scale = 1.0;
double tolerance = cairo_get_tolerance(ct);
Geom::Affine gs2user = transform;
if (units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX && bbox) {
Geom::Affine bbox2user(bbox->width(), 0, 0, bbox->height(), bbox->left(), bbox->top());
gs2user *= bbox2user;
}
// we need to use vectors with the same direction to represent the transformed
// radius and the focus-center delta, because gs2user might contain non-uniform scaling
Geom::Point d(focus - center);
Geom::Point d_user(d.length(), 0);
Geom::Point r_user(radius, 0);
Geom::Point fr_user(focusr, 0);
d_user *= gs2user.withoutTranslation();
r_user *= gs2user.withoutTranslation();
fr_user *= gs2user.withoutTranslation();
double dx = d_user.x(), dy = d_user.y();
cairo_user_to_device_distance(ct, &dx, &dy);
// compute the tolerance distance in user space
// create a vector with the same direction as the transformed d,
// with the length equal to tolerance
double dl = hypot(dx, dy);
double tx = tolerance * dx / dl, ty = tolerance * dy / dl;
cairo_device_to_user_distance(ct, &tx, &ty);
double tolerance_user = hypot(tx, ty);
if (d_user.length() + tolerance_user > r_user.length()) {
scale = r_user.length() / d_user.length();
// nudge the focus slightly inside
scale *= 1.0 - 2.0 * tolerance / dl;
}
auto pat = cairo_pattern_create_radial(scale * d.x() + center.x(), scale * d.y() + center.y(), focusr, center.x(), center.y(), radius);
common_setup(pat, bbox, opacity);
// add stops
for (auto &stop : stops) {
// multiply stop opacity by paint opacity
cairo_pattern_add_color_stop_rgba(pat, stop.offset, stop.color.v.c[0], stop.color.v.c[1], stop.color.v.c[2], stop.opacity * opacity);
}
return pat;
}
cairo_pattern_t *DrawingMeshGradient::create_pattern(cairo_t *, Geom::OptRect const &bbox, double opacity) const
{
#ifdef MESH_DEBUG
std::cout << "sp_meshgradient_create_pattern: " << bbox << " " << opacity << std::endl;
#endif
auto pat = cairo_pattern_create_mesh();
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
auto &data = patchdata[i][j];
cairo_mesh_pattern_begin_patch(pat);
cairo_mesh_pattern_move_to(pat, data.points[0][0].x(), data.points[0][0].y());
for (int k = 0; k < 4; k++) {
switch (data.pathtype[k]) {
case 'l':
case 'L':
case 'z':
case 'Z':
cairo_mesh_pattern_line_to(pat, data.points[k][3].x(), data.points[k][3].y());
break;
case 'c':
case 'C':
cairo_mesh_pattern_curve_to(pat, data.points[k][1].x(), data.points[k][1].y(),
data.points[k][2].x(), data.points[k][2].y(),
data.points[k][3].x(), data.points[k][3].y());
break;
default:
// Shouldn't happen
std::cerr << "sp_mesh_create_pattern: path error" << std::endl;
}
if (data.tensorIsSet[k]) {
Geom::Point t = data.tensorpoints[k];
cairo_mesh_pattern_set_control_point(pat, k, t.x(), t.y());
}
cairo_mesh_pattern_set_corner_color_rgba(pat, k,
data.color[k][0],
data.color[k][1],
data.color[k][2],
data.opacity[k] * opacity);
}
cairo_mesh_pattern_end_patch(pat);
}
}
// set pattern transform matrix
Geom::Affine gs2user = transform;
if (units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX && bbox) {
Geom::Affine bbox2user(bbox->width(), 0, 0, bbox->height(), bbox->left(), bbox->top());
gs2user *= bbox2user;
}
ink_cairo_pattern_set_matrix(pat, gs2user.inverse());
return pat;
}
} // namespace Inkscape
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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