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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_DISPLAY_DRAWING_PAINT_SERVER_H
#define INKSCAPE_DISPLAY_DRAWING_PAINT_SERVER_H
/**
* @file
* Representation of paint servers used when rendering.
*/
/*
* Author: PBS <pbs3141@gmail.com>
* Copyright (C) 2022 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <array>
#include <vector>
#include <cairo.h>
#include <2geom/rect.h>
#include <2geom/affine.h>
#include "object/sp-gradient-spread.h"
#include "object/sp-gradient-units.h"
#include "object/sp-gradient-vector.h"
class SPGradient;
namespace Inkscape {
/**
* A DrawingPaintServer is a lightweight copy of the resources needed to paint using a paint server.
*
* It is built by an SPPaintServer, stored in the DrawingItem tree, and used when rendering.
*
* The pattern information is stored in a rendering-backend agnostic way, and the object remains
* valid even after the original SPPaintServer is modified or destroyed.
*/
class DrawingPaintServer
{
public:
virtual ~DrawingPaintServer() = 0;
/// Produce a pattern that can be used for painting with Cairo.
virtual cairo_pattern_t *create_pattern(cairo_t *ct, Geom::OptRect const &bbox, double opacity) const = 0;
/// Return whether this paint server could benefit from dithering.
virtual bool ditherable() const { return false; }
/// Return whether create_pattern() uses its cairo_t argument. Such pattern cannot be cached, but recreated each time.
/// Fixme: The only reson this exists is to work around https://gitlab.freedesktop.org/cairo/cairo/-/issues/146.
virtual bool uses_cairo_ctx() const { return false; }
};
// Todo: Remove, merging with existing implementation for solid colours.
/**
* A simple solid color, storing an RGB color and an opacity.
*/
class DrawingSolidColor final
: public DrawingPaintServer
{
public:
DrawingSolidColor(float *c, double alpha)
: c({c[0], c[1], c[2]})
, alpha(alpha) {}
cairo_pattern_t *create_pattern(cairo_t *, Geom::OptRect const &, double opacity) const override;
private:
std::array<float, 3> c; ///< RGB color components.
double alpha;
};
/**
* The base class for all gradients.
*/
class DrawingGradient
: public DrawingPaintServer
{
protected:
DrawingGradient(SPGradientSpread spread, SPGradientUnits units, Geom::Affine const &transform)
: spread(spread)
, units(units)
, transform(transform) {}
bool ditherable() const override { return true; }
/// Perform some common initialization steps on the given Cairo pattern.
void common_setup(cairo_pattern_t *pat, Geom::OptRect const &bbox, double opacity) const;
SPGradientSpread spread;
SPGradientUnits units;
Geom::Affine transform;
};
/**
* A linear gradient.
*/
class DrawingLinearGradient final
: public DrawingGradient
{
public:
DrawingLinearGradient(SPGradientSpread spread, SPGradientUnits units, Geom::Affine const &transform,
float x1, float y1, float x2, float y2, std::vector<SPGradientStop> stops)
: DrawingGradient(spread, units, transform)
, x1(x1)
, y1(y1)
, x2(x2)
, y2(y2)
, stops(std::move(stops)) {}
cairo_pattern_t *create_pattern(cairo_t*, Geom::OptRect const &bbox, double opacity) const override;
private:
float x1, y1, x2, y2;
std::vector<SPGradientStop> stops;
};
/**
* A radial gradient.
*/
class DrawingRadialGradient final
: public DrawingGradient
{
public:
DrawingRadialGradient(SPGradientSpread spread, SPGradientUnits units, Geom::Affine const &transform,
float fx, float fy, float cx, float cy, float r, float fr, std::vector<SPGradientStop> stops)
: DrawingGradient(spread, units, transform)
, fx(fx)
, fy(fy)
, cx(cx)
, cy(cy)
, r(r)
, fr(fr)
, stops(std::move(stops)) {}
cairo_pattern_t *create_pattern(cairo_t *ct, Geom::OptRect const &bbox, double opacity) const override;
bool uses_cairo_ctx() const override { return true; }
private:
float fx, fy, cx, cy, r, fr;
std::vector<SPGradientStop> stops;
};
/**
* A mesh gradient.
*/
class DrawingMeshGradient final
: public DrawingGradient
{
public:
struct PatchData
{
Geom::Point points[4][4];
char pathtype[4];
bool tensorIsSet[4];
Geom::Point tensorpoints[4];
std::array<float, 3> color[4];
double opacity[4];
};
DrawingMeshGradient(SPGradientSpread spread, SPGradientUnits units, Geom::Affine const &transform,
int rows, int cols, std::vector<std::vector<PatchData>> patchdata)
: DrawingGradient(spread, units, transform)
, rows(rows)
, cols(cols)
, patchdata(std::move(patchdata)) {}
cairo_pattern_t *create_pattern(cairo_t*, Geom::OptRect const &bbox, double opacity) const override;
private:
int rows;
int cols;
std::vector<std::vector<PatchData>> patchdata;
};
} // namespace Inkscape
#endif // INKSCAPE_DISPLAY_DRAWING_PAINT_SERVER_H
/*
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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