Rendering Insecure WebVR Warnings into a texture with Skia.

chrome/browser/android/vr_shell/textures/ui_texture.cc

+// Copyright 2017 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 "chrome/browser/android/vr_shell/textures/ui_texture.h"
+
+#include <string>
+#include <vector>
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_util.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace vr_shell {
+
+// TODO(acondor): Create non-square textures to reduce memory usage.
+UITexture::UITexture(int texture_handle, int texture_size)
+    : texture_handle_(texture_handle),
+      texture_size_(texture_size),
+      surface_(SkSurface::MakeRasterN32Premul(texture_size_, texture_size_)) {}
+
+UITexture::~UITexture() = default;
+
+void UITexture::DrawAndLayout() {
+  cc::SkiaPaintCanvas paint_canvas(surface_->getCanvas());
+  gfx::Canvas canvas(&paint_canvas, 1.0f);
+  canvas.DrawColor(0x00000000);
+  Draw(&canvas);
+  SetSize();
+}
+
+void UITexture::Flush() {
+  cc::SkiaPaintCanvas paint_canvas(surface_->getCanvas());
+  paint_canvas.flush();
+  SkPixmap pixmap;
+  CHECK(surface_->peekPixels(&pixmap));
+
+  glBindTexture(GL_TEXTURE_2D, texture_handle_);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pixmap.width(), pixmap.height(), 0,
+               GL_RGBA, GL_UNSIGNED_BYTE, pixmap.addr());
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+}
+
+}  // namespace vr_shell