Rendering text on insecure-site warnings for WebVR

chrome/browser/android/vr_shell/textures/insecure_content_permanent_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_permanent_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 = SK_ColorWHITE;
 const SkColor kForegroundColor = 0xFF444444;
+constexpr float kBorderFactor = 0.1;
+constexpr float kIconSizeFactor = 0.7;
+constexpr float kFontSizeFactor = 0.45;
+constexpr float kTextHeightFactor = 1.0 - 2 * kBorderFactor;
+constexpr float kTextWidthFactor = 4.0 - 3 * kBorderFactor - kIconSizeFactor;
 
 }  // namespace
 
 InsecureContentPermanentTexture::InsecureContentPermanentTexture(
     int texture_handle,
     int texture_size)
     : UITexture(texture_handle, texture_size) {
   // Ensuring height is a quarter of the width.
   DCHECK(texture_size_ % 4 == 0);
   height_ = texture_size_ / 4;
 }
 
 InsecureContentPermanentTexture::~InsecureContentPermanentTexture() = default;
 
 void InsecureContentPermanentTexture::Draw(gfx::Canvas* canvas) {
   cc::PaintFlags flags;
   flags.setColor(kBackgroundColor);
-  canvas->DrawRoundRect(gfx::Rect(texture_size_, height_), height_ * 0.1,
+
+  int text_flags = gfx::Canvas::TEXT_ALIGN_CENTER | gfx::Canvas::NO_ELLIPSIS;
+  auto text =
+      l10n_util::GetStringUTF16(IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_PERMANENT);
+  auto fonts = GetFontList(height_ * kFontSizeFactor, text);
+  int text_height = kTextHeightFactor * height_;
+  int text_width = kTextWidthFactor * height_;
+  canvas->SizeStringInt(text, fonts, &text_width, &text_height, 0, text_flags);

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

Canvas::SizeStringInt is a static function

+  // Giving some extra width without reaching the texture limit.
+  text_width = static_cast<int>(std::min(
+      text_width + 2 * kBorderFactor * height_, kTextWidthFactor * height_));
+  width_ = static_cast<int>(
+      ceil((3 * kBorderFactor + kIconSizeFactor) * height_ + text_width));
+
+  canvas->DrawRoundRect(gfx::Rect(width_, height_), height_ * kBorderFactor,
                         flags);
+
   canvas->Save();
-  canvas->Translate({height_ * 0.1, height_ * 0.1});
-  PaintVectorIcon(canvas, ui::kInfoOutlineIcon, height_ * 0.8,
+  canvas->Translate({IsRTL() ? 2 * kBorderFactor * height_ + text_width
+                             : height_ * kBorderFactor,
+                     height_ * (1.0 - kIconSizeFactor) / 2.0});
+  PaintVectorIcon(canvas, ui::kInfoOutlineIcon, height_ * kIconSizeFactor,
                   kForegroundColor);
   canvas->Restore();
+
   canvas->Save();
-  canvas->Translate({height_, height_ * 0.1});
-  // TODO(acondor): Draw text IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_PERMANENT.
+  canvas->Translate({height_ * (IsRTL() ? kBorderFactor
+                                        : 2 * kBorderFactor + kIconSizeFactor),
+                     height_ * kBorderFactor});
+  canvas->DrawStringRectWithFlags(
+      text, GetFontList(height_ * kFontSizeFactor, text), kForegroundColor,

[mthiesse, 2017/04/21 00:03:11]

reuse |fonts|

+      gfx::Rect(text_width, kTextHeightFactor * height_), text_flags);
   canvas->Restore();
 }
 
 void InsecureContentPermanentTexture::SetSize() {
-  size_.SetSize(texture_size_, height_);
+  size_.SetSize(width_, height_);
 }
 
 }  // namespace vr_shell