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// SPDX-License-Identifier: GPL-2.0-or-later
#include <2geom/parallelogram.h>
#include "ui/util.h"
#include "helper/geom.h"
#include "graphics.h"
#include "util.h"
namespace Inkscape {
namespace UI {
namespace Widget {
namespace {
// Convert an rgba into a pattern, turning transparency into checkerboard-ness.
Cairo::RefPtr<Cairo::Pattern> rgba_to_pattern(uint32_t rgba)
{
if (SP_RGBA32_A_U(rgba) == 255) {
return Cairo::SolidPattern::create_rgb(SP_RGBA32_R_F(rgba), SP_RGBA32_G_F(rgba), SP_RGBA32_B_F(rgba));
} else {
int constexpr w = 6;
int constexpr h = 6;
auto dark = checkerboard_darken(rgba);
auto surface = Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, 2 * w, 2 * h);
auto cr = Cairo::Context::create(surface);
cr->set_operator(Cairo::OPERATOR_SOURCE);
cr->set_source_rgb(SP_RGBA32_R_F(rgba), SP_RGBA32_G_F(rgba), SP_RGBA32_B_F(rgba));
cr->paint();
cr->set_source_rgb(dark[0], dark[1], dark[2]);
cr->rectangle(0, 0, w, h);
cr->rectangle(w, h, w, h);
cr->fill();
auto pattern = Cairo::SurfacePattern::create(surface);
pattern->set_extend(Cairo::EXTEND_REPEAT);
pattern->set_filter(Cairo::FILTER_NEAREST);
return pattern;
}
}
} // namespace
// Paint the background and pages using Cairo into the given fragment.
void Graphics::paint_background(Fragment const &fragment, PageInfo const &pi, uint32_t page, uint32_t desk, Cairo::RefPtr<Cairo::Context> const &cr)
{
cr->save();
cr->set_operator(Cairo::OPERATOR_SOURCE);
cr->rectangle(0, 0, fragment.rect.width(), fragment.rect.height());
cr->clip();
if (desk == page || check_single_page(fragment, pi)) {
// Desk and page are the same, or a single page fills the whole screen; just clear the fragment to page.
cr->set_source(rgba_to_pattern(page));
cr->paint();
} else {
// Paint the background to the complement of the pages. (Slightly overpaints when pages overlap.)
cr->save();
cr->set_source(rgba_to_pattern(desk));
cr->set_fill_rule(Cairo::FILL_RULE_EVEN_ODD);
cr->rectangle(0, 0, fragment.rect.width(), fragment.rect.height());
cr->translate(-fragment.rect.left(), -fragment.rect.top());
cr->transform(geom_to_cairo(fragment.affine));
for (auto &rect : pi.pages) {
cr->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
}
cr->fill();
cr->restore();
// Paint the pages.
cr->save();
cr->set_source(rgba_to_pattern(page));
cr->translate(-fragment.rect.left(), -fragment.rect.top());
cr->transform(geom_to_cairo(fragment.affine));
for (auto &rect : pi.pages) {
cr->rectangle(rect.left(), rect.top(), rect.width(), rect.height());
}
cr->fill();
cr->restore();
}
cr->restore();
}
std::pair<Geom::IntRect, Geom::IntRect> Graphics::calc_splitview_cliprects(Geom::IntPoint const &size, Geom::Point const &split_frac, SplitDirection split_direction)
{
auto window = Geom::IntRect({0, 0}, size);
auto content = window;
auto outline = window;
auto split = [&] (Geom::Dim2 dim, Geom::IntRect &lo, Geom::IntRect &hi) {
int s = std::round(split_frac[dim] * size[dim]);
lo[dim].setMax(s);
hi[dim].setMin(s);
};
switch (split_direction) {
case Inkscape::SplitDirection::NORTH: split(Geom::Y, content, outline); break;
case Inkscape::SplitDirection::EAST: split(Geom::X, outline, content); break;
case Inkscape::SplitDirection::SOUTH: split(Geom::Y, outline, content); break;
case Inkscape::SplitDirection::WEST: split(Geom::X, content, outline); break;
default: assert(false); break;
}
return std::make_pair(content, outline);
}
void Graphics::paint_splitview_controller(Geom::IntPoint const &size, Geom::Point const &split_frac, SplitDirection split_direction, SplitDirection hover_direction, Cairo::RefPtr<Cairo::Context> const &cr)
{
auto split_position = (split_frac * size).round();
// Add dividing line.
cr->set_source_rgb(0.0, 0.0, 0.0);
cr->set_line_width(1.0);
if (split_direction == Inkscape::SplitDirection::EAST ||
split_direction == Inkscape::SplitDirection::WEST) {
cr->move_to(split_position.x() + 0.5, 0.0 );
cr->line_to(split_position.x() + 0.5, size.y());
cr->stroke();
} else {
cr->move_to(0.0 , split_position.y() + 0.5);
cr->line_to(size.x(), split_position.y() + 0.5);
cr->stroke();
}
// Add controller image.
double a = hover_direction == Inkscape::SplitDirection::NONE ? 0.5 : 1.0;
cr->set_source_rgba(0.2, 0.2, 0.2, a);
cr->arc(split_position.x(), split_position.y(), 20, 0, 2 * M_PI);
cr->fill();
for (int i = 0; i < 4; i++) {
// The four direction triangles.
cr->save();
// Position triangle.
cr->translate(split_position.x(), split_position.y());
cr->rotate((i + 2) * M_PI / 2);
// Draw triangle.
cr->move_to(-5, 8);
cr->line_to( 0, 18);
cr->line_to( 5, 8);
cr->close_path();
double b = (int)hover_direction == (i + 1) ? 0.9 : 0.7;
cr->set_source_rgba(b, b, b, a);
cr->fill();
cr->restore();
}
}
bool Graphics::check_single_page(Fragment const &view, PageInfo const &pi)
{
auto pl = Geom::Parallelogram(view.rect) * view.affine.inverse();
return std::any_of(pi.pages.begin(), pi.pages.end(), [&] (auto &rect) {
return Geom::Parallelogram(rect).contains(pl);
});
}
} // namespace Widget
} // namespace UI
} // namespace Inkscape
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