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Diffstat (limited to '')
| -rw-r--r-- | src/ui/widget/canvas/graphics.cpp | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/ui/widget/canvas/graphics.cpp b/src/ui/widget/canvas/graphics.cpp new file mode 100644 index 0000000..28972e2 --- /dev/null +++ b/src/ui/widget/canvas/graphics.cpp @@ -0,0 +1,166 @@ +// 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 |