Re-land: ui: Add GLImage unit test framework.

ui/gl/test/gl_image_test_support.cc

+// Copyright 2015 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/test/gl_image_test_support.h"
+
+#include <vector>
+
+#include "third_party/skia/include/core/SkTypes.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/gl/gl_version_info.h"
+#include "ui/gl/test/gl_surface_test_support.h"
+
+#if defined(USE_OZONE)
+#include "base/message_loop/message_loop.h"
+#endif
+
+namespace gfx {
+
+// static
+void GLImageTestSupport::InitializeGL() {
+#if defined(USE_OZONE)
+  // On Ozone, the backend initializes the event system using a UI thread.
+  base::MessageLoopForUI main_loop;
+#endif
+
+  std::vector<GLImplementation> allowed_impls;
+  GetAllowedGLImplementations(&allowed_impls);
+  DCHECK(!allowed_impls.empty());
+
+  GLImplementation impl = allowed_impls[0];
+  GLSurfaceTestSupport::InitializeOneOffImplementation(impl, true);
+}
+
+// static
+void GLImageTestSupport::CleanupGL() {
+  ClearGLBindings();
+}
+
+// static
+GLenum GLImageTestSupport::GetPreferredInternalFormat() {
+  bool has_texture_format_bgra8888 =
+      GLContext::GetCurrent()->HasExtension(
+          "GL_APPLE_texture_format_BGRA8888") ||
+      GLContext::GetCurrent()->HasExtension("GL_EXT_texture_format_BGRA8888") ||
+      !GLContext::GetCurrent()->GetVersionInfo()->is_es;
+  return (!SK_B32_SHIFT && has_texture_format_bgra8888) ? GL_BGRA_EXT : GL_RGBA;
+}
+
+// static
+BufferFormat GLImageTestSupport::GetPreferredBufferFormat() {
+  return GetPreferredInternalFormat() == GL_BGRA_EXT ? BufferFormat::BGRA_8888
+                                                     : BufferFormat::RGBA_8888;
+}
+
+// static
+void GLImageTestSupport::SetBufferDataToColor(int width,
+                                              int height,
+                                              int stride,
+                                              BufferFormat format,
+                                              const uint8_t color[4],
+                                              uint8_t* data) {
+  switch (format) {
+    case BufferFormat::RGBA_8888:
+      for (int y = 0; y < height; ++y) {
+        for (int x = 0; x < width; ++x) {
+          data[y * stride + x * 4 + 0] = color[0];
+          data[y * stride + x * 4 + 1] = color[1];
+          data[y * stride + x * 4 + 2] = color[2];
+          data[y * stride + x * 4 + 3] = color[3];
+        }
+      }
+      return;
+    case BufferFormat::BGRA_8888:
+      for (int y = 0; y < height; ++y) {
+        for (int x = 0; x < width; ++x) {
+          data[y * stride + x * 4 + 0] = color[2];
+          data[y * stride + x * 4 + 1] = color[1];
+          data[y * stride + x * 4 + 2] = color[0];
+          data[y * stride + x * 4 + 3] = color[3];
+        }
+      }
+      return;
+    case BufferFormat::ATC:
+    case BufferFormat::ATCIA:
+    case BufferFormat::DXT1:
+    case BufferFormat::DXT5:
+    case BufferFormat::ETC1:
+    case BufferFormat::R_8:
+    case BufferFormat::RGBA_4444:
+    case BufferFormat::BGRX_8888:
+    case BufferFormat::UYVY_422:
+    case BufferFormat::YUV_420_BIPLANAR:
+    case BufferFormat::YUV_420:
+      NOTREACHED();
+      return;
+  }
+  NOTREACHED();
+}
+
+}  // namespace gfx