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https://github.com/RGBCube/serenity
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WindowServer: Avoid overdraw by shattering dirty rects into unique shards.
The algorithm I came up with is O(n^2) but given the small numbers of rects we're typically working with, it doesn't really matter. May need to revisit this in the future if we find ourselves with a huge number of rects.
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420b7bd55f
commit
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7 changed files with 127 additions and 21 deletions
46
SharedGraphics/DisjointRectSet.cpp
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46
SharedGraphics/DisjointRectSet.cpp
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@ -0,0 +1,46 @@
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#include <SharedGraphics/DisjointRectSet.h>
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void DisjointRectSet::add(const Rect& new_rect)
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{
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for (auto& rect : m_rects) {
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if (rect.contains(new_rect))
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return;
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}
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m_rects.append(new_rect);
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if (m_rects.size() > 1)
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shatter();
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}
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void DisjointRectSet::shatter()
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{
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Vector<Rect> output;
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bool pass_had_intersections = false;
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do {
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pass_had_intersections = false;
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output.clear_with_capacity();
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for (size_t i = 0; i < m_rects.size(); ++i) {
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auto& r1 = m_rects[i];
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bool r1_had_intersections = false;
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for (size_t j = 0; j < m_rects.size(); ++j) {
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if (i == j)
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continue;
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auto& r2 = m_rects[j];
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if (!r1.intersects(r2))
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continue;
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pass_had_intersections = true;
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auto pieces = r1.shatter(r2);
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for (auto& piece : pieces)
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output.append(piece);
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m_rects.remove(i);
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for (; i < m_rects.size(); ++i)
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output.append(m_rects[i]);
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goto next_pass;
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}
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if (!r1_had_intersections)
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output.append(r1);
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}
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next_pass:
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swap(output, m_rects);
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} while(pass_had_intersections);
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}
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23
SharedGraphics/DisjointRectSet.h
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23
SharedGraphics/DisjointRectSet.h
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@ -0,0 +1,23 @@
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#pragma once
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#include <AK/Vector.h>
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#include <SharedGraphics/Rect.h>
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class DisjointRectSet {
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public:
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DisjointRectSet() { }
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~DisjointRectSet() { }
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DisjointRectSet(DisjointRectSet&& other) : m_rects(move(other.m_rects)) { }
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void add(const Rect&);
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void clear() { m_rects.clear(); }
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void clear_with_capacity() { m_rects.clear_with_capacity(); }
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const Vector<Rect>& rects() const { return m_rects; }
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private:
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void shatter();
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Vector<Rect> m_rects;
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};
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@ -33,3 +33,47 @@ Rect Rect::united(const Rect& other) const
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rect.set_bottom(max(bottom(), other.bottom()));
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return rect;
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}
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Vector<Rect> Rect::shatter(const Rect& hammer) const
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{
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Vector<Rect> pieces;
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if (!intersects(hammer)) {
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pieces.append(*this);
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pieces.append(hammer);
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return pieces;
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}
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Rect top_shard {
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x(),
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y(),
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width(),
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hammer.y() - y()
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};
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Rect bottom_shard {
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x(),
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hammer.y() + hammer.height(),
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width(),
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(y() + height()) - (hammer.y() + hammer.height())
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};
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Rect left_shard {
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x(),
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max(hammer.y(), y()),
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hammer.x() - x(),
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min((hammer.y() + hammer.height()), (y() + height())) - max(hammer.y(), y())
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};
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Rect right_shard {
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hammer.x() + hammer.width(),
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max(hammer.y(), y()),
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(x() + width() - 1) - (hammer.x() + hammer.width() - 1),
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min((hammer.y() + hammer.height()), (y() + height())) - max(hammer.y(), y())
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};
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if (intersects(top_shard))
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pieces.append(top_shard);
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if (intersects(bottom_shard))
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pieces.append(bottom_shard);
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if (intersects(left_shard))
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pieces.append(left_shard);
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if (intersects(right_shard))
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pieces.append(right_shard);
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return pieces;
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}
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@ -170,6 +170,8 @@ public:
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Point location() const { return m_location; }
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Size size() const { return m_size; }
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Vector<Rect> shatter(const Rect& hammer) const;
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operator WSAPI_Rect() const;
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bool operator==(const Rect& other) const
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@ -4,6 +4,7 @@ SHAREDGRAPHICS_OBJS = \
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../SharedGraphics/Rect.o \
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../SharedGraphics/GraphicsBitmap.o \
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../SharedGraphics/CharacterBitmap.o \
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../SharedGraphics/DisjointRectSet.o \
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../SharedGraphics/Color.o
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WINDOWSERVER_OBJS = \
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@ -614,10 +614,10 @@ void WSWindowManager::compose()
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{
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auto dirty_rects = move(m_dirty_rects);
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auto cursor_location = m_screen.cursor_location();
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dirty_rects.append(m_last_cursor_rect);
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dirty_rects.append({ cursor_location.x(), cursor_location.y(), (int)m_cursor_bitmap_inner->width(), (int)m_cursor_bitmap_inner->height() });
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dirty_rects.add(m_last_cursor_rect);
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dirty_rects.add({ cursor_location.x(), cursor_location.y(), (int)m_cursor_bitmap_inner->width(), (int)m_cursor_bitmap_inner->height() });
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#ifdef DEBUG_COUNTERS
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dbgprintf("[WM] compose #%u (%u rects)\n", ++m_compose_count, dirty_rects.size());
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dbgprintf("[WM] compose #%u (%u rects)\n", ++m_compose_count, dirty_rects.rects().size());
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#endif
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auto any_opaque_window_contains_rect = [this] (const Rect& r) {
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@ -639,14 +639,14 @@ void WSWindowManager::compose()
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auto any_dirty_rect_intersects_window = [&dirty_rects] (const WSWindow& window) {
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auto window_rect = outer_window_rect(window.rect());
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for (auto& dirty_rect : dirty_rects) {
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for (auto& dirty_rect : dirty_rects.rects()) {
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if (dirty_rect.intersects(window_rect))
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return true;
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}
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return false;
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};
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for (auto& dirty_rect : dirty_rects) {
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for (auto& dirty_rect : dirty_rects.rects()) {
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if (any_opaque_window_contains_rect(dirty_rect))
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continue;
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if (!m_wallpaper)
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@ -661,7 +661,7 @@ void WSWindowManager::compose()
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return IterationDecision::Continue;
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if (!any_dirty_rect_intersects_window(window))
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return IterationDecision::Continue;
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for (auto& dirty_rect : dirty_rects) {
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for (auto& dirty_rect : dirty_rects.rects()) {
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m_back_painter->set_clip_rect(dirty_rect);
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paint_window_frame(window);
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Rect dirty_rect_in_window_coordinates = Rect::intersection(dirty_rect, window.rect());
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@ -685,12 +685,12 @@ void WSWindowManager::compose()
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draw_cursor();
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if (m_flash_flush) {
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for (auto& rect : dirty_rects)
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for (auto& rect : dirty_rects.rects())
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m_front_painter->fill_rect(rect, Color::Yellow);
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}
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flip_buffers();
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for (auto& r : dirty_rects)
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for (auto& r : dirty_rects.rects())
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flush(r);
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}
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@ -808,18 +808,7 @@ void WSWindowManager::invalidate(const Rect& a_rect, bool should_schedule_compos
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if (rect.is_empty())
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return;
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for (auto& r : m_dirty_rects) {
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if (r.contains(rect))
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return;
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if (r.intersects(rect)) {
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// Unite with the existing dirty rect.
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// FIXME: It would be much nicer to compute the exact rects needing repaint.
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r = r.united(rect);
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return;
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}
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}
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m_dirty_rects.append(rect);
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m_dirty_rects.add(rect);
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if (should_schedule_compose_event && !m_pending_compose_event) {
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WSMessageLoop::the().post_message(this, make<WSMessage>(WSMessage::WM_DeferredCompose));
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@ -3,6 +3,7 @@
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#include <SharedGraphics/Rect.h>
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#include <SharedGraphics/Color.h>
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#include <SharedGraphics/Painter.h>
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#include <SharedGraphics/DisjointRectSet.h>
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#include <AK/HashTable.h>
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#include <AK/InlineLinkedList.h>
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#include <AK/WeakPtr.h>
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@ -127,7 +128,7 @@ private:
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RetainPtr<GraphicsBitmap> m_front_bitmap;
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RetainPtr<GraphicsBitmap> m_back_bitmap;
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Vector<Rect> m_dirty_rects;
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DisjointRectSet m_dirty_rects;
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bool m_pending_compose_event { false };
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