Rendering text on insecure-site warnings for WebVR

chrome/browser/android/vr_shell/textures/insecure_content_transient_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/insecure_content_transient_texture.h"
 
 #include "cc/paint/skia_paint_canvas.h"
 #include "chrome/grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/font_list.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icon_types.h"
 #include "ui/vector_icons/vector_icons.h"
 
 namespace vr_shell {
 
 namespace {
 
 const SkColor kBackgroundColor = 0xCC1A1A1A;
 const SkColor kForegroundColor = SK_ColorWHITE;
+constexpr float kBorderFactor = 0.045;
+constexpr float kIconSizeFactor = 0.25;
+constexpr float kFontSizeFactor = 0.045;
+constexpr float kTextWidthFactor = 1.0 - 3 * kBorderFactor - kIconSizeFactor;
 
 }  // namespace
 
 InsecureContentTransientTexture::InsecureContentTransientTexture(
     int texture_handle,
     int texture_size)
     : UITexture(texture_handle, texture_size) {
-  // Ensuring height is half the width.
-  DCHECK(texture_size_ % 2 == 0);
-  height_ = texture_size_ / 2;
 }
 
 InsecureContentTransientTexture::~InsecureContentTransientTexture() = default;
 
 void InsecureContentTransientTexture::Draw(gfx::Canvas* canvas) {
   cc::PaintFlags flags;
   flags.setColor(kBackgroundColor);
-  canvas->DrawRoundRect(gfx::Rect(texture_size_, height_), height_ * 0.1,
-                        flags);
+
+  int text_flags = gfx::Canvas::TEXT_ALIGN_CENTER | gfx::Canvas::MULTI_LINE;
+  auto text =
+      l10n_util::GetStringUTF16(IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_TRANSIENT);
+  auto fonts = GetFontList(texture_size_ * kFontSizeFactor, text);
+
+  int text_width = texture_size_ * kTextWidthFactor;
+  int text_height = 0;  // Will be increased during text measurement.
+  canvas->SizeStringInt(text, fonts, &text_width, &text_height, 0, text_flags);

[mthiesse, 2017/04/21 00:12:24]

Canvas::SizeStringInt is a static function

+  // Making sure that the icon fits in the box.
+  text_height = std::max(
+      text_height, static_cast<int>(ceil(texture_size_ * kIconSizeFactor)));
+  // Making sure the drawing fits within the texture.
+  text_height = std::min(
+      text_height, static_cast<int>((1.0 - 2 * kBorderFactor) * texture_size_));
+  height_ =
+      static_cast<int>(ceil(texture_size_ * 2 * kBorderFactor + text_height));
+
+  canvas->DrawRoundRect(gfx::Rect(texture_size_, height_),
+                        height_ * kBorderFactor, flags);
+
   canvas->Save();
-  canvas->Translate({height_ * 0.1, height_ * 0.25});
-  PaintVectorIcon(canvas, ui::kInfoOutlineIcon, height_ * 0.5,
+  canvas->Translate({IsRTL() ? 2 * kBorderFactor * texture_size_ + text_width
+                             : texture_size_ * kBorderFactor,
+                     (height_ - kIconSizeFactor * texture_size_) / 2.0});
+  PaintVectorIcon(canvas, ui::kInfoOutlineIcon, texture_size_ * kIconSizeFactor,
                   kForegroundColor);
   canvas->Restore();
+
   canvas->Save();
-  canvas->Translate({height_ * 0.7, height_ * 0.1});
-  // TODO(acondor): Draw text IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_TRANSIENT.
+  canvas->Translate(
+      {IsRTL() ? kBorderFactor * texture_size_
+               : texture_size_ * (2 * kBorderFactor + kIconSizeFactor),
+       texture_size_ * kBorderFactor});
+  canvas->DrawStringRectWithFlags(
+      text, fonts, kForegroundColor,
+      gfx::Rect(kTextWidthFactor * texture_size_, text_height), text_flags);
   canvas->Restore();
 }
 
 void InsecureContentTransientTexture::SetSize() {
   size_.SetSize(texture_size_, height_);
 }
 
 }  // namespace vr_shell