Add a unit test for FlutterIOSurfaceHolder

shell/platform/darwin/macos/BUILD.gn

@@ -180,6 +180,9 @@ executable("flutter_desktop_darwin_unittests") {
     "framework/Source/FlutterEngineTestUtils.mm",
     "framework/Source/FlutterFrameBufferProviderUnittests.mm",
     "framework/Source/FlutterGLCompositorUnittests.mm",
+    "framework/Source/FlutterGLTestUtils.h",
+    "framework/Source/FlutterGLTestUtils.mm",
+    "framework/Source/FlutterIOSurfaceHolderUnittests.mm",
     "framework/Source/FlutterKeyboardManagerUnittests.mm",
     "framework/Source/FlutterMetalCompositorUnittests.mm",
     "framework/Source/FlutterMetalRendererTest.mm",

shell/platform/darwin/macos/framework/Source/FlutterFrameBufferProviderUnittests.mm

@@ -5,18 +5,16 @@
 #import <Foundation/Foundation.h>
 
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterFrameBufferProvider.h"
-#import "flutter/testing/testing.h"
+#import "flutter/shell/platform/darwin/macos/framework/Source/FlutterGLTestUtils.h"
 
 #import <OpenGL/gl.h>
 
+#import "flutter/testing/testing.h"
+
 namespace flutter::testing {
 
 TEST(FlutterFrameBufferProviderTest, TestCreate) {
-  NSOpenGLPixelFormatAttribute attributes[] = {
-      NSOpenGLPFAColorSize, 24, NSOpenGLPFAAlphaSize, 8, 0,
-  };
-  NSOpenGLPixelFormat* pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
-  NSOpenGLContext* context = [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:nil];
+  NSOpenGLContext* context = CreateTestOpenGLContext();
 
   [context makeCurrentContext];
   FlutterFrameBufferProvider* framebufferProvider =

shell/platform/darwin/macos/framework/Source/FlutterGLTestUtils.h

@@ -0,0 +1,13 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Cocoa/Cocoa.h>
+
+namespace flutter::testing {
+
+// Returns an NSOpenGLContext with a 24-bit color + 8-bit alpha pixel
+// format.
+NSOpenGLContext* CreateTestOpenGLContext();
+
+}  // namespace flutter::testing

shell/platform/darwin/macos/framework/Source/FlutterGLTestUtils.mm

@@ -0,0 +1,19 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "flutter/shell/platform/darwin/macos/framework/Source/FlutterGLTestUtils.h"
+
+#import <OpenGL/gl.h>
+
+namespace flutter::testing {
+
+NSOpenGLContext* CreateTestOpenGLContext() {
+  NSOpenGLPixelFormatAttribute attributes[] = {
+      NSOpenGLPFAColorSize, 24, NSOpenGLPFAAlphaSize, 8, 0,
+  };
+  NSOpenGLPixelFormat* pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
+  return [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:nil];
+}
+
+}  // flutter::testing

shell/platform/darwin/macos/framework/Source/FlutterIOSurfaceHolderUnittests.mm

@@ -0,0 +1,43 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+
+#import "flutter/shell/platform/darwin/macos/framework/Source/FlutterGLTestUtils.h"
+#import "flutter/shell/platform/darwin/macos/framework/Source/FlutterIOSurfaceHolder.h"
+
+#import <OpenGL/gl.h>
+#import "flutter/testing/testing.h"
+
+namespace flutter::testing {
+
+TEST(FlutterIOSurfaceHolder, BindSurface) {
+  NSOpenGLContext* context = CreateTestOpenGLContext();
+
+  [context makeCurrentContext];
+
+  GLuint fbo;
+  GLuint tex;
+
+  glGenFramebuffers(1, &fbo);
+  glGenTextures(1, &tex);
+
+  FlutterIOSurfaceHolder* ioSurfaceHolder = [[FlutterIOSurfaceHolder alloc] init];
+
+  [ioSurfaceHolder bindSurfaceToTexture:tex fbo:fbo size:CGSizeMake(1.0f, 2.0f)];
+
+  GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+  EXPECT_TRUE(status == GL_FRAMEBUFFER_COMPLETE);
+
+  IOSurfaceRef ioSurface = [ioSurfaceHolder ioSurface];
+  EXPECT_EQ(IOSurfaceGetWidth(ioSurface), 1u);
+  EXPECT_EQ(IOSurfaceGetHeight(ioSurface), 2u);
+
+  [ioSurfaceHolder recreateIOSurfaceWithSize:CGSizeMake(3.0f, 4.0f)];
+
+  EXPECT_EQ(IOSurfaceGetWidth(ioSurface), 3u);
+  EXPECT_EQ(IOSurfaceGetHeight(ioSurface), 4u);
+}
+
+}  // flutter::testing