damageRing: move to hyprland impl

A small wlroots utility we were still using.

src/helpers/DamageRing.cpp

@@ -0,0 +1,52 @@
+#include "DamageRing.hpp"
+
+void CDamageRing::setSize(const Vector2D& size_) {
+    if (size_ == size)
+        return;
+
+    size = size_;
+
+    damageEntire();
+}
+
+bool CDamageRing::damage(const CRegion& rg) {
+    CRegion clipped = rg.copy().intersect(CBox{{}, size});
+    if (clipped.empty())
+        return false;
+
+    current.add(clipped);
+    return true;
+}
+
+void CDamageRing::damageEntire() {
+    damage(CBox{{}, size});
+}
+
+void CDamageRing::rotate() {
+    previousIdx = (previousIdx + DAMAGE_RING_PREVIOUS_LEN - 1) % DAMAGE_RING_PREVIOUS_LEN;
+
+    previous[previousIdx] = current;
+    current.clear();
+}
+
+CRegion CDamageRing::getBufferDamage(int age) {
+    if (age <= 0 || age > DAMAGE_RING_PREVIOUS_LEN + 1)
+        return CBox{{}, size};
+
+    CRegion damage = current;
+
+    for (int i = 0; i < age - 1; ++i) {
+        int j = (previousIdx + i) % DAMAGE_RING_PREVIOUS_LEN;
+        damage.add(previous.at(j));
+    }
+
+    // don't return a ludicrous amount of rects
+    if (damage.getRects().size() > 8)
+        return damage.getExtents();
+
+    return damage;
+}
+
+bool CDamageRing::hasChanged() {
+    return !current.empty();
+}

src/helpers/DamageRing.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "./math/Math.hpp"
+#include <array>
+
+constexpr static int DAMAGE_RING_PREVIOUS_LEN = 2;
+
+class CDamageRing {
+  public:
+    void    setSize(const Vector2D& size_);
+    bool    damage(const CRegion& rg);
+    void    damageEntire();
+    void    rotate();
+    CRegion getBufferDamage(int age);
+    bool    hasChanged();
+
+  private:
+    Vector2D                                      size;
+    CRegion                                       current;
+    std::array<CRegion, DAMAGE_RING_PREVIOUS_LEN> previous;
+    size_t                                        previousIdx = 0;
+};

src/helpers/Monitor.cpp

@@ -17,12 +17,10 @@ int ratHandler(void* data) {
 }
 
 CMonitor::CMonitor() : state(this) {
-    wlr_damage_ring_init(&damage);
+    ;
 }
 
 CMonitor::~CMonitor() {
-    wlr_damage_ring_finish(&damage);
-
     hyprListener_monitorDestroy.removeCallback();
     hyprListener_monitorFrame.removeCallback();
     hyprListener_monitorStateRequest.removeCallback();
@@ -162,7 +160,7 @@ void CMonitor::onConnect(bool noRule) {
     if (!state.commit())
         Debug::log(WARN, "wlr_output_commit_state failed in CMonitor::onCommit");
 
-    wlr_damage_ring_set_bounds(&damage, vecTransformedSize.x, vecTransformedSize.y);
+    damage.setSize(vecTransformedSize);
 
     Debug::log(LOG, "Added new monitor with name {} at {:j0} with size {:j0}, pointer {:x}", output->name, vecPosition, vecPixelSize, (uintptr_t)output);
 
@@ -345,9 +343,9 @@ void CMonitor::onDisconnect(bool destroy) {
 void CMonitor::addDamage(const pixman_region32_t* rg) {
     static auto PZOOMFACTOR = CConfigValue<Hyprlang::FLOAT>("cursor:zoom_factor");
     if (*PZOOMFACTOR != 1.f && g_pCompositor->getMonitorFromCursor() == this) {
-        wlr_damage_ring_add_whole(&damage);
+        damage.damageEntire();
         g_pCompositor->scheduleFrameForMonitor(this);
-    } else if (wlr_damage_ring_add(&damage, rg))
+    } else if (damage.damage(rg))
         g_pCompositor->scheduleFrameForMonitor(this);
 }
 
@@ -358,13 +356,11 @@ void CMonitor::addDamage(const CRegion* rg) {
 void CMonitor::addDamage(const CBox* box) {
     static auto PZOOMFACTOR = CConfigValue<Hyprlang::FLOAT>("cursor:zoom_factor");
     if (*PZOOMFACTOR != 1.f && g_pCompositor->getMonitorFromCursor() == this) {
-        wlr_damage_ring_add_whole(&damage);
+        damage.damageEntire();
         g_pCompositor->scheduleFrameForMonitor(this);
     }
 
-    wlr_box damageBox = {(int)box->x, (int)box->y, (int)box->w, (int)box->h};
-
-    if (wlr_damage_ring_add_box(&damage, &damageBox))
+    if (damage.damage(*box))
         g_pCompositor->scheduleFrameForMonitor(this);
 }
 
@@ -379,7 +375,7 @@ bool CMonitor::shouldSkipScheduleFrameOnMouseEvent() {
     // keep requested minimum refresh rate
     if (shouldSkip && *PMINRR && lastPresentationTimer.getMillis() > 1000 / *PMINRR) {
         // damage whole screen because some previous cursor box damages were skipped
-        wlr_damage_ring_add_whole(&damage);
+        damage.damageEntire();
         return false;
     }
 

src/helpers/Monitor.hpp

@@ -11,6 +11,7 @@
 #include "math/Math.hpp"
 #include <optional>
 #include "signal/Signal.hpp"
+#include "DamageRing.hpp"
 
 // Enum for the different types of auto directions, e.g. auto-left, auto-up.
 enum eAutoDirs {
@@ -60,33 +61,32 @@ class CMonitor {
     CMonitor();
     ~CMonitor();
 
-    Vector2D        vecPosition         = Vector2D(-1, -1); // means unset
-    Vector2D        vecXWaylandPosition = Vector2D(-1, -1); // means unset
-    Vector2D        vecSize             = Vector2D(0, 0);
-    Vector2D        vecPixelSize        = Vector2D(0, 0);
-    Vector2D        vecTransformedSize  = Vector2D(0, 0);
+    Vector2D                vecPosition         = Vector2D(-1, -1); // means unset
+    Vector2D                vecXWaylandPosition = Vector2D(-1, -1); // means unset
+    Vector2D                vecSize             = Vector2D(0, 0);
+    Vector2D                vecPixelSize        = Vector2D(0, 0);
+    Vector2D                vecTransformedSize  = Vector2D(0, 0);
 
-    bool            primary = false;
+    bool                    primary = false;
 
-    uint64_t        ID                     = -1;
-    PHLWORKSPACE    activeWorkspace        = nullptr;
-    PHLWORKSPACE    activeSpecialWorkspace = nullptr;
-    float           setScale               = 1; // scale set by cfg
-    float           scale                  = 1; // real scale
+    uint64_t                ID                     = -1;
+    PHLWORKSPACE            activeWorkspace        = nullptr;
+    PHLWORKSPACE            activeSpecialWorkspace = nullptr;
+    float                   setScale               = 1; // scale set by cfg
+    float                   scale                  = 1; // real scale
 
-    std::string     szName             = "";
-    std::string     szDescription      = "";
-    std::string     szShortDescription = "";
+    std::string             szName             = "";
+    std::string             szDescription      = "";
+    std::string             szShortDescription = "";
 
-    Vector2D        vecReservedTopLeft     = Vector2D(0, 0);
-    Vector2D        vecReservedBottomRight = Vector2D(0, 0);
+    Vector2D                vecReservedTopLeft     = Vector2D(0, 0);
+    Vector2D                vecReservedBottomRight = Vector2D(0, 0);
 
-    drmModeModeInfo customDrmMode = {};
+    drmModeModeInfo         customDrmMode = {};
 
-    CMonitorState   state;
+    CMonitorState           state;
+    CDamageRing             damage;
 
-    // WLR stuff
-    wlr_damage_ring         damage;
     wlr_output*             output          = nullptr;
     float                   refreshRate     = 60;
     int                     framesToSkip    = 0;

src/includes.hpp

@@ -53,7 +53,6 @@ extern "C" {
 #include <wlr/types/wlr_primary_selection_v1.h>
 #include <wlr/types/wlr_viewporter.h>
 #include <wlr/types/wlr_subcompositor.h>
-#include <wlr/types/wlr_damage_ring.h>
 #include <wlr/util/log.h>
 #include <wlr/util/region.h>
 #include <wlr/util/edges.h>

src/render/Renderer.cpp

@@ -1246,7 +1246,7 @@ void CHyprRenderer::renderMonitor(CMonitor* pMonitor) {
     clock_gettime(CLOCK_MONOTONIC, &now);
 
     // check the damage
-    bool hasChanged = pMonitor->output->needs_frame || pixman_region32_not_empty(&pMonitor->damage.current);
+    bool hasChanged = pMonitor->output->needs_frame || pMonitor->damage.hasChanged();
 
     if (!hasChanged && *PDAMAGETRACKINGMODE != DAMAGE_TRACKING_NONE && pMonitor->forceFullFrames == 0 && damageBlinkCleanup == 0)
         return;
@@ -1414,7 +1414,7 @@ void CHyprRenderer::renderMonitor(CMonitor* pMonitor) {
     pMonitor->state.wlr()->tearing_page_flip = shouldTear;
 
     if (!pMonitor->state.commit()) {
-        wlr_damage_ring_add_whole(&pMonitor->damage);
+        pMonitor->damage.damageEntire();
         return;
     }
 
@@ -2245,7 +2245,7 @@ bool CHyprRenderer::applyMonitorRule(CMonitor* pMonitor, SMonitorRule* pMonitorR
     // updato wlroots
     g_pCompositor->arrangeMonitors();
 
-    wlr_damage_ring_set_bounds(&pMonitor->damage, pMonitor->vecTransformedSize.x, pMonitor->vecTransformedSize.y);
+    pMonitor->damage.setSize(pMonitor->vecTransformedSize);
 
     // Set scale for all surfaces on this monitor, needed for some clients
     // but not on unsafe state to avoid crashes
@@ -2609,13 +2609,15 @@ bool CHyprRenderer::beginRender(CMonitor* pMonitor, CRegion& damage, eRenderMode
         return true;
     }
 
+    int bufferAge = 0;
+
     if (!buffer) {
         if (!wlr_output_configure_primary_swapchain(pMonitor->output, pMonitor->state.wlr(), &pMonitor->output->swapchain)) {
             Debug::log(ERR, "Failed to configure primary swapchain for {}", pMonitor->szName);
             return false;
         }
 
-        m_pCurrentWlrBuffer = wlr_swapchain_acquire(pMonitor->output->swapchain, nullptr);
+        m_pCurrentWlrBuffer = wlr_swapchain_acquire(pMonitor->output->swapchain, &bufferAge);
         if (!m_pCurrentWlrBuffer) {
             Debug::log(ERR, "Failed to acquire swapchain buffer for {}", pMonitor->szName);
             return false;
@@ -2634,8 +2636,10 @@ bool CHyprRenderer::beginRender(CMonitor* pMonitor, CRegion& damage, eRenderMode
         return false;
     }
 
-    if (mode == RENDER_MODE_NORMAL)
-        wlr_damage_ring_rotate_buffer(&pMonitor->damage, m_pCurrentWlrBuffer, damage.pixman());
+    if (mode == RENDER_MODE_NORMAL) {
+        damage = pMonitor->damage.getBufferDamage(bufferAge);
+        pMonitor->damage.rotate();
+    }
 
     m_pCurrentRenderbuffer->bind();
     if (simple)