Update the native_viewport interface to allow specification of the surface configuration, currently…

ui/gl/gl_surface_egl.cc

Index: ui/gl/gl_surface_egl.cc
diff --git a/ui/gl/gl_surface_egl.cc b/ui/gl/gl_surface_egl.cc
index 4aa43653a3114938830fd4f934a7283bf2c0b70c..5bdd98e33b184416a6925400e8e97db1c6f5ab04 100644
--- a/ui/gl/gl_surface_egl.cc
+++ b/ui/gl/gl_surface_egl.cc
@@ -47,7 +47,6 @@ namespace gfx {
 
 namespace {
 
-EGLConfig g_config;
 EGLDisplay g_display;
 EGLNativeDisplayType g_native_display_type;
 
@@ -111,7 +110,9 @@ void DeinitializeEgl() {
 
 }  // namespace
 
-GLSurfaceEGL::GLSurfaceEGL() {
+GLSurfaceEGL::GLSurfaceEGL(
+  const gfx::SurfaceConfiguration requested_configuration)
+    : GLSurface(requested_configuration) {
   ++g_num_surfaces;
   if (!g_initialized) {
     bool result = GLSurfaceEGL::InitializeOneOff();
@@ -120,42 +121,51 @@ GLSurfaceEGL::GLSurfaceEGL() {
   }
 }
 
-bool GLSurfaceEGL::InitializeOneOff() {
-  if (g_initialized)
-    return true;
-
-  g_native_display_type = GetPlatformDefaultEGLNativeDisplay();
-
-  g_display = eglGetDisplay(g_native_display_type);
-
-  if (!g_display) {
-    LOG(ERROR) << "eglGetDisplay failed with error " << GetLastEGLErrorString();
-    return false;
-  }
+void* GetEGLConfig(const gfx::SurfaceConfiguration configuration,
+                   bool allow_window_bit) {
+  // Choose an EGL configuration.
+  // On X this is only used for PBuffer surfaces.
+  EGLConfig config = {0};
 
-  if (!eglInitialize(g_display, NULL, NULL)) {
-    LOG(ERROR) << "eglInitialize failed with error " << GetLastEGLErrorString();
-    return false;
+#if defined(USE_X11)
+  XWindowAttributes win_attribs;
+  if (!XGetWindowAttributes(GetNativeDisplay(), window_, &win_attribs)) {
+    return nullptr;
   }
+#endif
 
-  // Choose an EGL configuration.
-  // On X this is only used for PBuffer surfaces.
   EGLint renderable_type = EGL_OPENGL_ES2_BIT;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableUnsafeES3APIs)) {
     renderable_type = EGL_OPENGL_ES3_BIT;
   }
   const EGLint kConfigAttribs[] = {
-    EGL_BUFFER_SIZE, 32,
-    EGL_ALPHA_SIZE, 8,
-    EGL_BLUE_SIZE, 8,
-    EGL_GREEN_SIZE, 8,
-    EGL_RED_SIZE, 8,
+    EGL_BUFFER_SIZE, configuration.alpha_bits +
+                     configuration.red_bits +
+                     configuration.green_bits +
+                     configuration.blue_bits,
+    EGL_ALPHA_SIZE, configuration.alpha_bits,
+    EGL_BLUE_SIZE, configuration.blue_bits,
+    EGL_GREEN_SIZE, configuration.green_bits,
+    EGL_RED_SIZE, configuration.red_bits,
+    EGL_DEPTH_SIZE, configuration.depth_bits,
+    EGL_STENCIL_SIZE, configuration.stencil_bits,
     EGL_RENDERABLE_TYPE, renderable_type,
-    EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
+    EGL_SURFACE_TYPE, (allow_window_bit ?
+                        (EGL_WINDOW_BIT | EGL_PBUFFER_BIT) :
+                        EGL_PBUFFER_BIT),
     EGL_NONE
   };
 
+#if defined(USE_X11)
+  // Try matching the window depth with an alpha channel,
+  // because we're worried the destination alpha width could
+  // constrain blending precision.
+  const int kBufferSizeOffset = 1;
+  const int kAlphaSizeOffset = 3;
+  config_attribs[kBufferSizeOffset] = win_attribs.depth;
+#endif
+
 #if defined(USE_OZONE)
   const EGLint* config_attribs =
       ui::SurfaceFactoryOzone::GetInstance()->GetEGLSurfaceProperties(
@@ -172,21 +182,72 @@ bool GLSurfaceEGL::InitializeOneOff() {
                        &num_configs)) {
     LOG(ERROR) << "eglChooseConfig failed with error "
                << GetLastEGLErrorString();
-    return false;
+    return nullptr;
   }
 
-  if (num_configs == 0) {
-    LOG(ERROR) << "No suitable EGL configs found.";
-    return false;
+  if (!eglChooseConfig(g_display,
+                       config_attribs,
+                       &config,
+                       1,
+                       &num_configs)) {
+    LOG(ERROR) << "eglChooseConfig failed with error "
+               << GetLastEGLErrorString();
+    return nullptr;
+  }
+
+#if defined(USE_X11)
+  if (num_configs) {
+    EGLint config_depth;
+    if (!eglGetConfigAttrib(g_display,
+                            config,
+                            EGL_BUFFER_SIZE,
+                            &config_depth)) {
+      LOG(ERROR) << "eglGetConfigAttrib failed with error "
+                 << GetLastEGLErrorString();
+      return nullptr;
+    }
+
+    if (config_depth == win_attribs.depth) {
+      return config;
+    }
   }
 
+  // Try without an alpha channel.
+  config_attribs[kAlphaSizeOffset] = 0;
   if (!eglChooseConfig(g_display,
                        config_attribs,
-                       &g_config,
+                       &config,
                        1,
                        &num_configs)) {
     LOG(ERROR) << "eglChooseConfig failed with error "
                << GetLastEGLErrorString();
+    return nullptr;
+  }
+#endif
+
+  if (num_configs == 0) {
+    LOG(ERROR) << "No suitable EGL configs found.";
+    return nullptr;
+  }
+
+  return config;
+}
+
+bool GLSurfaceEGL::InitializeOneOff() {
+  if (g_initialized)
+    return true;
+
+  g_native_display_type = GetPlatformDefaultEGLNativeDisplay();
+
+  g_display = eglGetDisplay(g_native_display_type);
+
+  if (!g_display) {
+    LOG(ERROR) << "eglGetDisplay failed with error " << GetLastEGLErrorString();
+    return false;
+  }
+
+  if (!eglInitialize(g_display, NULL, NULL)) {
+    LOG(ERROR) << "eglInitialize failed with error " << GetLastEGLErrorString();
     return false;
   }
 
@@ -292,8 +353,11 @@ GLSurfaceEGL::~GLSurfaceEGL() {
   }
 }
 
-NativeViewGLSurfaceEGL::NativeViewGLSurfaceEGL(EGLNativeWindowType window)
-    : window_(window),
+NativeViewGLSurfaceEGL::NativeViewGLSurfaceEGL(
+    EGLNativeWindowType window,
+    const gfx::SurfaceConfiguration requested_configuration)
+    : GLSurfaceEGL(requested_configuration),
+      window_(window),
       surface_(NULL),
       supports_post_sub_buffer_(false),
       config_(NULL),
@@ -371,80 +435,11 @@ void NativeViewGLSurfaceEGL::Destroy() {
 }
 
 EGLConfig NativeViewGLSurfaceEGL::GetConfig() {
-#if !defined(USE_X11)
-  return g_config;
-#else
   if (!config_) {
-    // Get a config compatible with the window
     DCHECK(window_);
-    XWindowAttributes win_attribs;
-    if (!XGetWindowAttributes(GetNativeDisplay(), window_, &win_attribs)) {
-      return NULL;
-    }
-
-    // Try matching the window depth with an alpha channel,
-    // because we're worried the destination alpha width could
-    // constrain blending precision.
-    const int kBufferSizeOffset = 1;
-    const int kAlphaSizeOffset = 3;
-    EGLint config_attribs[] = {
-      EGL_BUFFER_SIZE, ~0,
-      EGL_ALPHA_SIZE, 8,
-      EGL_BLUE_SIZE, 8,
-      EGL_GREEN_SIZE, 8,
-      EGL_RED_SIZE, 8,
-      EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
-      EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
-      EGL_NONE
-    };
-    config_attribs[kBufferSizeOffset] = win_attribs.depth;
-
-    EGLint num_configs;
-    if (!eglChooseConfig(g_display,
-                         config_attribs,
-                         &config_,
-                         1,
-                         &num_configs)) {
-      LOG(ERROR) << "eglChooseConfig failed with error "
-                 << GetLastEGLErrorString();
-      return NULL;
-    }
-
-    if (num_configs) {
-      EGLint config_depth;
-      if (!eglGetConfigAttrib(g_display,
-                              config_,
-                              EGL_BUFFER_SIZE,
-                              &config_depth)) {
-        LOG(ERROR) << "eglGetConfigAttrib failed with error "
-                   << GetLastEGLErrorString();
-        return NULL;
-      }
-
-      if (config_depth == win_attribs.depth) {
-        return config_;
-      }
-    }
-
-    // Try without an alpha channel.
-    config_attribs[kAlphaSizeOffset] = 0;
-    if (!eglChooseConfig(g_display,
-                         config_attribs,
-                         &config_,
-                         1,
-                         &num_configs)) {
-      LOG(ERROR) << "eglChooseConfig failed with error "
-                 << GetLastEGLErrorString();
-      return NULL;
-    }
-
-    if (num_configs == 0) {
-      LOG(ERROR) << "No suitable EGL configs found.";
-      return NULL;
-    }
+    config_ = GetEGLConfig(this->get_surface_configuration(), true);
   }
   return config_;
-#endif
 }
 
 bool NativeViewGLSurfaceEGL::IsOffscreen() {
@@ -548,9 +543,13 @@ NativeViewGLSurfaceEGL::~NativeViewGLSurfaceEGL() {
 #endif
 }
 
-PbufferGLSurfaceEGL::PbufferGLSurfaceEGL(const gfx::Size& size)
-    : size_(size),
-      surface_(NULL) {
+PbufferGLSurfaceEGL::PbufferGLSurfaceEGL(
+    const gfx::Size& size,
+    const gfx::SurfaceConfiguration requested_configuration)
+    : GLSurfaceEGL(requested_configuration),
+      size_(size),
+      surface_(nullptr),
+      config_(nullptr) {
   // Some implementations of Pbuffer do not support having a 0 size. For such
   // cases use a (1, 1) surface.
   if (size_.GetArea() == 0)
@@ -603,7 +602,10 @@ void PbufferGLSurfaceEGL::Destroy() {
 }
 
 EGLConfig PbufferGLSurfaceEGL::GetConfig() {
-  return g_config;
+  if (!config_) {
+    config_ = GetEGLConfig(this->get_surface_configuration(), false);
+  }
+  return config_;
 }
 
 bool PbufferGLSurfaceEGL::IsOffscreen() {
@@ -673,8 +675,10 @@ PbufferGLSurfaceEGL::~PbufferGLSurfaceEGL() {
   Destroy();
 }
 
-SurfacelessEGL::SurfacelessEGL(const gfx::Size& size)
-    : size_(size) {
+SurfacelessEGL::SurfacelessEGL(
+  const gfx::Size& size,
+  const gfx::SurfaceConfiguration requested_configuration)
+    : GLSurfaceEGL(requested_configuration), size_(size) {
 }
 
 bool SurfacelessEGL::Initialize() {
@@ -685,7 +689,7 @@ void SurfacelessEGL::Destroy() {
 }
 
 EGLConfig SurfacelessEGL::GetConfig() {
-  return g_config;
+  return NULL;
 }
 
 bool SurfacelessEGL::IsOffscreen() {