Support swap damage rect using eglSwapBuffersWithDamageKHR

ui/gl/gl_surface_egl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_surface_egl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 620 matching lines @@
 
   return g_display;
 }
 
 NativeViewGLSurfaceEGL::NativeViewGLSurfaceEGL(EGLNativeWindowType window)
     : window_(window),
       size_(1, 1),
       enable_fixed_size_angle_(false),
       surface_(NULL),
       supports_post_sub_buffer_(false),
+      supports_swap_buffer_with_damage_(false),
       flips_vertically_(false),
       swap_interval_(1) {
 #if defined(OS_ANDROID)
   if (window)
     ANativeWindow_acquire(window);
 #endif
 
 #if defined(OS_WIN)
   vsync_override_ = false;
   swap_generation_ = 0;
@@ skipping 72 matching lines @@
     return false;
   }
 
   if (g_driver_egl.ext.b_EGL_NV_post_sub_buffer) {
     EGLint surfaceVal;
     EGLBoolean retVal = eglQuerySurface(
         GetDisplay(), surface_, EGL_POST_SUB_BUFFER_SUPPORTED_NV, &surfaceVal);
     supports_post_sub_buffer_ = (surfaceVal && retVal) == EGL_TRUE;
   }
 
+  supports_swap_buffer_with_damage_ =
+      g_driver_egl.ext.b_EGL_KHR_swap_buffers_with_damage &&
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableSwapBuffersWithDamage);
+
   if (sync_provider)
     vsync_provider_.reset(sync_provider.release());
   else if (g_egl_sync_control_supported)
     vsync_provider_.reset(new EGLSyncControlVSyncProvider(surface_));
   return true;
 }
 
 bool NativeViewGLSurfaceEGL::InitializeNativeWindow() {
   return true;
 }
@@ skipping 119 matching lines @@
     LOG(ERROR) << "Failed to create surface.";
     return false;
   }
   return true;
 }
 
 EGLSurface NativeViewGLSurfaceEGL::GetHandle() {
   return surface_;
 }
 
+bool NativeViewGLSurfaceEGL::SupportsSwapBuffersWithDamage() {
+  return supports_swap_buffer_with_damage_;
+}
+
 bool NativeViewGLSurfaceEGL::SupportsPostSubBuffer() {
   return supports_post_sub_buffer_;
 }
 
 bool NativeViewGLSurfaceEGL::FlipsVertically() const {
   return flips_vertically_;
 }
 
 bool NativeViewGLSurfaceEGL::BuffersFlipped() const {
   return g_use_direct_composition;
 }
 
+gfx::SwapResult NativeViewGLSurfaceEGL::SwapBuffersWithDamage(int x,
+                                                              int y,
+                                                              int width,
+                                                              int height) {
+  DCHECK(supports_swap_buffer_with_damage_);
+  UpdateSwapInterval();
+  if (!CommitAndClearPendingOverlays()) {
+    DVLOG(1) << "Failed to commit pending overlay planes.";
+    return gfx::SwapResult::SWAP_FAILED;
+  }
+  if (flips_vertically_) {
+    // With EGL_SURFACE_ORIENTATION_INVERT_Y_ANGLE the contents are rendered
+    // inverted, but the damage rectangle is still measured from the
+    // bottom left.
+    y = GetSize().height() - y - height;
+  }
+
+  EGLint damage_rect[4] = {x, y, width, height};
+  if (!eglSwapBuffersWithDamageKHR(GetDisplay(), surface_, damage_rect, 1)) {
+    DVLOG(1) << "eglSwapBuffersWithDamageKHR failed with error "
+             << GetLastEGLErrorString();
+    return gfx::SwapResult::SWAP_FAILED;
+  }
+  return gfx::SwapResult::SWAP_ACK;
+}
+
 gfx::SwapResult NativeViewGLSurfaceEGL::PostSubBuffer(int x,
                                                       int y,
                                                       int width,
                                                       int height) {
   DCHECK(supports_post_sub_buffer_);
   UpdateSwapInterval();
   if (!CommitAndClearPendingOverlays()) {
     DVLOG(1) << "Failed to commit pending overlay planes.";
     return gfx::SwapResult::SWAP_FAILED;
   }
@@ skipping 261 matching lines @@
 }
 
 void* SurfacelessEGL::GetShareHandle() {
   return NULL;
 }
 
 SurfacelessEGL::~SurfacelessEGL() {
 }
 
 }  // namespace gl