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// SPDX-License-Identifier: GPL-2.0-or-later
#include "updaters.h"
#include "ui/util.h"
namespace Inkscape {
namespace UI {
namespace Widget {
class ResponsiveUpdater : public Updater
{
public:
Strategy get_strategy() const override { return Strategy::Responsive; }
void reset() override { clean_region = Cairo::Region::create(); }
void intersect (Geom::IntRect const &rect) override { clean_region->intersect(geom_to_cairo(rect)); }
void mark_dirty(Geom::IntRect const &rect) override { clean_region->subtract(geom_to_cairo(rect)); }
void mark_dirty(Cairo::RefPtr<Cairo::Region> const ®) override { clean_region->subtract(reg); }
void mark_clean(Geom::IntRect const &rect) override { clean_region->do_union(geom_to_cairo(rect)); }
Cairo::RefPtr<Cairo::Region> get_next_clean_region() override { return clean_region; }
bool report_finished () override { return false; }
void next_frame () override {}
};
class FullRedrawUpdater : public ResponsiveUpdater
{
// Whether we are currently in the middle of a redraw.
bool inprogress = false;
// Contains a copy of the old clean region if damage events occurred during the current redraw, otherwise null.
Cairo::RefPtr<Cairo::Region> old_clean_region;
public:
Strategy get_strategy() const override { return Strategy::FullRedraw; }
void reset() override
{
ResponsiveUpdater::reset();
inprogress = false;
old_clean_region.clear();
}
void intersect(const Geom::IntRect &rect) override
{
ResponsiveUpdater::intersect(rect);
if (old_clean_region) old_clean_region->intersect(geom_to_cairo(rect));
}
void mark_dirty(Geom::IntRect const &rect) override
{
if (inprogress && !old_clean_region) old_clean_region = clean_region->copy();
ResponsiveUpdater::mark_dirty(rect);
}
void mark_dirty(const Cairo::RefPtr<Cairo::Region> ®) override
{
if (inprogress && !old_clean_region) old_clean_region = clean_region->copy();
ResponsiveUpdater::mark_dirty(reg);
}
void mark_clean(const Geom::IntRect &rect) override
{
ResponsiveUpdater::mark_clean(rect);
if (old_clean_region) old_clean_region->do_union(geom_to_cairo(rect));
}
Cairo::RefPtr<Cairo::Region> get_next_clean_region() override
{
inprogress = true;
if (!old_clean_region) {
return clean_region;
} else {
return old_clean_region;
}
}
bool report_finished() override
{
assert(inprogress);
if (!old_clean_region) {
// Completed redraw without being damaged => finished.
inprogress = false;
return false;
} else {
// Completed redraw but damage events arrived => ask for another redraw, using the up-to-date clean region.
old_clean_region.clear();
return true;
}
}
};
class MultiscaleUpdater : public ResponsiveUpdater
{
// Whether we are currently in the middle of a redraw.
bool inprogress = false;
// Whether damage events occurred during the current redraw.
bool activated = false;
int counter; // A steadily incrementing counter from which the current scale is derived.
int scale; // The current scale to process updates at.
int elapsed; // How much time has been spent at the current scale.
std::vector<Cairo::RefPtr<Cairo::Region>> blocked; // The region blocked from being updated at each scale.
public:
Strategy get_strategy() const override { return Strategy::Multiscale; }
void reset() override
{
ResponsiveUpdater::reset();
inprogress = activated = false;
}
void intersect(const Geom::IntRect &rect) override
{
ResponsiveUpdater::intersect(rect);
if (activated) {
for (auto ® : blocked) {
reg->intersect(geom_to_cairo(rect));
}
}
}
void mark_dirty(Geom::IntRect const &rect) override
{
ResponsiveUpdater::mark_dirty(rect);
post_mark_dirty();
}
void mark_dirty(const Cairo::RefPtr<Cairo::Region> ®) override
{
ResponsiveUpdater::mark_dirty(reg);
post_mark_dirty();
}
void post_mark_dirty()
{
if (inprogress && !activated) {
counter = scale = elapsed = 0;
blocked = { Cairo::Region::create() };
activated = true;
}
}
void mark_clean(const Geom::IntRect &rect) override
{
ResponsiveUpdater::mark_clean(rect);
if (activated) blocked[scale]->do_union(geom_to_cairo(rect));
}
Cairo::RefPtr<Cairo::Region> get_next_clean_region() override
{
inprogress = true;
if (!activated) {
return clean_region;
} else {
auto result = clean_region->copy();
result->do_union(blocked[scale]);
return result;
}
}
bool report_finished() override
{
assert(inprogress);
if (!activated) {
// Completed redraw without damage => finished.
inprogress = false;
return false;
} else {
// Completed redraw but damage events arrived => begin updating any remaining damaged regions.
activated = false;
blocked.clear();
return true;
}
}
void next_frame() override
{
if (!activated) return;
// Stay at the current scale for 2^scale frames.
elapsed++;
if (elapsed < (1 << scale)) return;
elapsed = 0;
// Adjust the counter, which causes scale to hop around the values 0, 1, 2... spending half as much time at each subsequent scale.
counter++;
scale = 0;
for (int tmp = counter; tmp % 2 == 1; tmp /= 2) {
scale++;
}
// Ensure sufficiently many blocked zones exist.
if (scale == blocked.size()) {
blocked.emplace_back();
}
// Recreate the current blocked zone as the union of the clean region and lower-scale blocked zones.
blocked[scale] = clean_region->copy();
for (int i = 0; i < scale; i++) {
blocked[scale]->do_union(blocked[i]);
}
}
};
template<> std::unique_ptr<Updater> Updater::create<Updater::Strategy::Responsive>() {return std::make_unique<ResponsiveUpdater>();}
template<> std::unique_ptr<Updater> Updater::create<Updater::Strategy::FullRedraw>() {return std::make_unique<FullRedrawUpdater>();}
template<> std::unique_ptr<Updater> Updater::create<Updater::Strategy::Multiscale>() {return std::make_unique<MultiscaleUpdater>();}
std::unique_ptr<Updater> Updater::create(Strategy strategy)
{
switch (strategy)
{
case Strategy::Responsive: return create<Strategy::Responsive>();
case Strategy::FullRedraw: return create<Strategy::FullRedraw>();
case Strategy::Multiscale: return create<Strategy::Multiscale>();
default: return nullptr; // Never triggered, but GCC errors out on build without.
}
}
} // namespace Widget
} // namespace UI
} // 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 :
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