[client] egl: use desktop frame damage information

client/include/interface/renderer.h

@@ -114,7 +114,7 @@ typedef void         (* LG_RendererOnResize     )(void * opaque, const int width
 typedef bool         (* LG_RendererOnMouseShape )(void * opaque, const LG_RendererCursor cursor, const int width, const int height, const int pitch, const uint8_t * data);
 typedef bool         (* LG_RendererOnMouseEvent )(void * opaque, const bool visible , const int x, const int y);
 typedef bool         (* LG_RendererOnFrameFormat)(void * opaque, const LG_RendererFormat format, bool useDMA);
-typedef bool         (* LG_RendererOnFrame      )(void * opaque, const FrameBuffer * frame, int dmaFD);
+typedef bool         (* LG_RendererOnFrame      )(void * opaque, const FrameBuffer * frame, int dmaFD, const FrameDamageRect * damage, int damageCount);
 typedef void         (* LG_RendererOnAlert      )(void * opaque, const LG_MsgAlert alert, const char * message, bool ** closeFlag);
 typedef void         (* LG_RendererOnHelp       )(void * opaque, const char * message);
 typedef void         (* LG_RendererOnShowFPS    )(void * opaque, bool showFPS);

client/renderers/EGL/egl.c

@@ -21,6 +21,7 @@
 #include "interface/renderer.h"
 
 #include "common/debug.h"
+#include "common/KVMFR.h"
 #include "common/option.h"
 #include "common/sysinfo.h"
 #include "common/time.h"
@@ -59,6 +60,12 @@ struct Options
   bool doubleBuffer;
 };
 
+struct DesktopDamage
+{
+  int count;
+  FrameDamageRect rects[KVMFR_MAX_DAMAGE_RECTS];
+};
+
 struct Inst
 {
   bool dmaSupport;
@@ -116,6 +123,8 @@ struct Inst
 
   bool               cursorLastValid;
   struct CursorState cursorLast;
+
+  _Atomic(struct DesktopDamage *) desktopDamage;
 };
 
 static struct Option egl_options[] =
@@ -263,6 +272,8 @@ bool egl_create(void ** opaque, const LG_RendererParams params, bool * needsOpen
   this->screenScaleY = 1.0f;
   this->uiScale      = 1.0;
 
+  atomic_init(&this->desktopDamage, NULL);
+
   this->font = LG_Fonts[0];
   if (!egl_update_font(this))
     return false;
@@ -486,6 +497,15 @@ void egl_on_resize(void * opaque, const int width, const int height, const doubl
   egl_update_help_font(this);
 
   this->cursorLastValid = false;
+
+  struct DesktopDamage * damage = malloc(sizeof(struct DesktopDamage));
+  if (!damage)
+  {
+    DEBUG_FATAL("Out of memory");
+    abort();
+  }
+  damage->count = 0;
+  free(atomic_exchange(&this->desktopDamage, damage));
 }
 
 bool egl_on_mouse_shape(void * opaque, const LG_RendererCursor cursor,
@@ -548,7 +568,8 @@ bool egl_on_frame_format(void * opaque, const LG_RendererFormat format, bool use
   return egl_desktop_setup(this->desktop, format, useDMA);
 }
 
-bool egl_on_frame(void * opaque, const FrameBuffer * frame, int dmaFd)
+bool egl_on_frame(void * opaque, const FrameBuffer * frame, int dmaFd,
+    const FrameDamageRect * damageRects, int damageRectsCount)
 {
   struct Inst * this = (struct Inst *)opaque;
 
@@ -560,6 +581,17 @@ bool egl_on_frame(void * opaque, const FrameBuffer * frame, int dmaFd)
 
   this->start = true;
   this->cursorLastValid = false;
+
+  struct DesktopDamage * damage = malloc(sizeof(struct DesktopDamage));
+  if (!damage)
+  {
+    DEBUG_FATAL("Out of memory");
+    abort();
+  }
+  damage->count = damageRectsCount;
+  memcpy(damage->rects, damageRects, damageRectsCount * sizeof(FrameDamageRect));
+  free(atomic_exchange(&this->desktopDamage, damage));
+
   return true;
 }
 
@@ -801,8 +833,12 @@ bool egl_render(void * opaque, LG_RendererRotate rotate)
   bool hasLastCursor = this->cursorLastValid;
   bool cursorRendered = false;
   struct CursorState cursorState;
+  struct DesktopDamage * desktopDamage = NULL;
 
-  if (this->start && egl_desktop_render(this->desktop,
+  if (this->start)
+  {
+    desktopDamage = atomic_exchange(&this->desktopDamage, NULL);
+    if (egl_desktop_render(this->desktop,
         this->translateX, this->translateY,
         this->scaleX    , this->scaleY    ,
         this->scaleType , rotate))
@@ -820,6 +856,9 @@ bool egl_render(void * opaque, LG_RendererRotate rotate)
       egl_cursor_render(this->cursor,
           (this->format.rotate + rotate) % LG_ROTATE_MAX);
     }
+    else
+      desktopDamage->count = 0;
+  }
 
   if (!this->waitDone)
   {
@@ -864,7 +903,7 @@ bool egl_render(void * opaque, LG_RendererRotate rotate)
       egl_alert_render(this->alert, this->screenScaleX, this->screenScaleY);
   }
 
-  struct Rect damage[2];
+  struct Rect damage[KVMFR_MAX_DAMAGE_RECTS + 2];
   int damageIdx = 0;
 
   if (this->waitDone)
@@ -883,6 +922,35 @@ bool egl_render(void * opaque, LG_RendererRotate rotate)
     {
       this->cursorLast = cursorState;
       this->cursorLastValid = true;
+
+      if (cursorState.visible)
+        damage[damageIdx++] = cursorState.rect;
+    }
+
+    if (desktopDamage)
+    {
+      if (desktopDamage->count == 0)
+        // Zero damage count means invalidating entire window.
+        damageIdx = 0;
+      else
+      {
+        double scaleX = (double) this->destRect.w / this->format.width;
+        double scaleY = (double) this->destRect.h / this->format.height;
+        for (int i = 0; i < desktopDamage->count; ++i)
+        {
+          FrameDamageRect rect = desktopDamage->rects[i];
+          int x1 = (int) (rect.x * scaleX);
+          int y1 = (int) (rect.y * scaleY);
+          int x2 = (int) ceil((rect.x + rect.width) * scaleX);
+          int y2 = (int) ceil((rect.y + rect.height) * scaleY);
+          damage[damageIdx++] = (struct Rect) {
+            .x = this->destRect.x + x1,
+            .y = this->height - (this->destRect.y + y2),
+            .w = x2 - x1,
+            .h = y2 - y1,
+          };
+        }
+      }
     }
   }
 

client/renderers/OpenGL/opengl.c

@@ -419,7 +419,8 @@ bool opengl_on_frame_format(void * opaque, const LG_RendererFormat format, bool
   return true;
 }
 
-bool opengl_on_frame(void * opaque, const FrameBuffer * frame, int dmaFd)
+bool opengl_on_frame(void * opaque, const FrameBuffer * frame, int dmaFd,
+    const FrameDamageRect * damage, int damageCount)
 {
   struct Inst * this = (struct Inst *)opaque;
 

client/src/main.c

@@ -589,7 +589,8 @@ int main_frameThread(void * unused)
     }
 
     FrameBuffer * fb = (FrameBuffer *)(((uint8_t*)frame) + frame->offset);
-    if (!g_state.lgr->on_frame(g_state.lgrData, fb, useDMA ? dma->fd : -1))
+    if (!g_state.lgr->on_frame(g_state.lgrData, fb, useDMA ? dma->fd : -1,
+        frame->damageRects, frame->damageRectsCount))
     {
       lgmpClientMessageDone(queue);
       DEBUG_ERROR("renderer on frame returned failure");