From cca66b9ec4e494c1d919bff0f71a820d8afab1fa Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:24:48 +0200 Subject: Adding upstream version 1.2.2. Signed-off-by: Daniel Baumann --- src/display/drawing-pattern.cpp | 198 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 198 insertions(+) create mode 100644 src/display/drawing-pattern.cpp (limited to 'src/display/drawing-pattern.cpp') diff --git a/src/display/drawing-pattern.cpp b/src/display/drawing-pattern.cpp new file mode 100644 index 0000000..90bad03 --- /dev/null +++ b/src/display/drawing-pattern.cpp @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * @file + * Canvas belonging to SVG pattern. + *//* + * Authors: + * Tomasz Boczkowski + * + * Copyright (C) 2014 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "display/cairo-utils.h" +#include "display/drawing-context.h" +#include "display/drawing-pattern.h" +#include "display/drawing-surface.h" + +namespace Inkscape { + +DrawingPattern::DrawingPattern(Drawing &drawing, bool debug) + : DrawingGroup(drawing) + , _pattern_to_user(nullptr) + , _overflow_steps(1) + , _debug(debug) +{ +} + +DrawingPattern::~DrawingPattern() +{ + delete _pattern_to_user; // delete NULL; is safe +} + +void +DrawingPattern::setPatternToUserTransform(Geom::Affine const &new_trans) { + Geom::Affine current; + if (_pattern_to_user) { + current = *_pattern_to_user; + } + + if (!Geom::are_near(current, new_trans, 1e-18)) { + // mark the area where the object was for redraw. + _markForRendering(); + if (new_trans.isIdentity()) { + delete _pattern_to_user; // delete NULL; is safe + _pattern_to_user = nullptr; + } else { + _pattern_to_user = new Geom::Affine(new_trans); + } + _markForUpdate(STATE_ALL, true); + } +} + +void +DrawingPattern::setTileRect(Geom::Rect const &tile_rect) { + _tile_rect = tile_rect; +} + +void +DrawingPattern::setOverflow(Geom::Affine initial_transform, int steps, Geom::Affine step_transform) { + _overflow_initial_transform = initial_transform; + _overflow_steps = steps; + _overflow_step_transform = step_transform; +} + +cairo_pattern_t * +DrawingPattern::renderPattern(float opacity) { + bool needs_opacity = (1.0 - opacity) >= 1e-3; + bool visible = opacity >= 1e-3; + + if (!visible) { + return nullptr; + } + + if (!_tile_rect || (_tile_rect->area() == 0)) { + return nullptr; + } + Geom::Rect pattern_tile = *_tile_rect; + + //TODO: If pattern_to_user set it to identity transform + + // The DrawingSurface class handles the mapping from "logical space" + // (coordinates in the rendering) to "physical space" (surface pixels). + // An oversampling is done as the pattern may not pixel align with the final surface. + // The cairo surface is created when the DrawingContext is declared. + // Create drawing surface with size of pattern tile (in pattern space) but with number of pixels + // based on required resolution (c). + Inkscape::DrawingSurface pattern_surface(pattern_tile, _pattern_resolution); + Inkscape::DrawingContext dc(pattern_surface); + dc.transform( pattern_surface.drawingTransform().inverse() ); + + pattern_tile *= pattern_surface.drawingTransform(); + Geom::IntRect one_tile = pattern_tile.roundOutwards(); + + // Render pattern. + if (needs_opacity) { + dc.pushGroup(); // this group is for pattern + opacity + } + + if (_debug) { + dc.setSource(0.8, 0.0, 0.8); + dc.paint(); + } + + //FIXME: What flags to choose? + if (_overflow_steps == 1) { + render(dc, one_tile, RENDER_DEFAULT); + } else { + //Overflow transforms need to be transformed to the new coordinate system + //introduced by dc.transform( pattern_surface.drawingTransform().inverse() ); + Geom::Affine dt = pattern_surface.drawingTransform(); + Geom::Affine idt = pattern_surface.drawingTransform().inverse(); + Geom::Affine initial_transform = idt * _overflow_initial_transform * dt; + Geom::Affine step_transform = idt * _overflow_step_transform * dt; + dc.transform(initial_transform); + for (int i = 0; i < _overflow_steps; i++) { + // render() fails to handle transforms applied here when using cache. + render(dc, one_tile, RENDER_BYPASS_CACHE); + dc.transform(step_transform); + // cairo_surface_t* raw = pattern_surface.raw(); + // std::string filename = "drawing-pattern" + std::to_string(i) + ".png"; + // cairo_surface_write_to_png( pattern_surface.raw(), filename.c_str() ); + } + } + + // Uncomment to debug + // cairo_surface_t* raw = pattern_surface.raw(); + // std::cout << " cairo_surface (sp-pattern): " + // << " width: " << cairo_image_surface_get_width( raw ) + // << " height: " << cairo_image_surface_get_height( raw ) + // << std::endl; + // std::string filename = "drawing-pattern.png"; + // cairo_surface_write_to_png( pattern_surface.raw(), filename.c_str() ); + + if (needs_opacity) { + dc.popGroupToSource(); // pop raw pattern + dc.paint(opacity); // apply opacity + } + + cairo_pattern_t *cp = cairo_pattern_create_for_surface(pattern_surface.raw()); + // Apply transformation to user space. Also compensate for oversampling. + if (_pattern_to_user) { + ink_cairo_pattern_set_matrix(cp, _pattern_to_user->inverse() * pattern_surface.drawingTransform()); + } else { + ink_cairo_pattern_set_matrix(cp, pattern_surface.drawingTransform()); + } + + if (_debug) { + cairo_pattern_set_extend(cp, CAIRO_EXTEND_NONE); + } else { + cairo_pattern_set_extend(cp, CAIRO_EXTEND_REPEAT); + } + + return cp; +} + +// TODO investigate if area should be used. +unsigned DrawingPattern::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset) +{ + UpdateContext pattern_ctx; + + if (!_tile_rect || (_tile_rect->area() == 0)) { + return STATE_NONE; + } + + Geom::Rect pattern_tile = *_tile_rect; + Geom::Coord det_ctm = ctx.ctm.descrim(); + Geom::Coord det_ps2user = _pattern_to_user ? _pattern_to_user->descrim() : 1.0; + Geom::Coord det_child_transform = _child_transform ? _child_transform->descrim() : 1.0; + const double oversampling = 2.0; + double scale = det_ctm*det_ps2user*det_child_transform * oversampling; + //FIXME: When scale is too big (zooming in a hatch), cairo doesn't render the pattern + //More precisely it fails when setting pattern matrix in DrawingPattern::renderPattern + //Fully correct solution should make use of visible area bbox and change hatch tile rect + //accordingly + if (scale > 25) { + scale = 25; + } + Geom::Point c(pattern_tile.dimensions()*scale*oversampling); + _pattern_resolution = c.ceil(); + + Inkscape::DrawingSurface pattern_surface(pattern_tile, _pattern_resolution); + + pattern_ctx.ctm = pattern_surface.drawingTransform(); + return DrawingGroup::_updateItem(Geom::IntRect::infinite(), pattern_ctx, flags, reset); +} + +} // end 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 : -- cgit v1.2.3