VR: Add initial URL bar element and texture.

chrome/browser/android/vr_shell/textures/url_bar_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/url_bar_texture.h"
+
+#include "base/strings/utf_string_conversions.h"
+#include "cc/paint/skia_paint_canvas.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/font.h"
+#include "ui/gfx/font_list.h"
+#include "ui/gfx/geometry/rect.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 {
+
+static constexpr char kDefaultFontFamily[] = "sans-serif";

[acondor_, 2017/05/05 19:06:41]

In order to avoid this duplicated string, maybe we should add a function to
UiTexture that doesn't provide any text.

[cjgrant, 2017/05/08 14:17:41]

Will do.

[cjgrant, 2017/05/08 15:10:24]

Done.

+
+static constexpr SkColor kTextureBackground = 0x00AAAAAA;
+static constexpr SkColor kBackground = 0xCCAAAAAA;
+static constexpr SkColor kBackgroundHover = 0xCCDDDDDD;
+static constexpr SkColor kForeground = 0xCC444444;
+static constexpr SkColor kSeparatorColor =
+    SkColorSetARGBMacro(256 * 0.2, 0, 0, 0);
+
+static constexpr float kWidth = 0.672;
+static constexpr float kHeight = 0.088;
+static constexpr float kFontHeight = 0.027;
+static constexpr float kBackButtonWidth = kHeight;
+static constexpr float kBackIconHeight = 0.05;
+static constexpr float kBackIconOffset = 0.005;
+static constexpr float kSecurityFieldWidth = 0.06;
+static constexpr float kSecurityIconHeight = 0.03;
+static constexpr float kUrlRightMargin = 0.02;
+static constexpr float kSeparatorWidth = 0.002;
+
+}  // namespace
+
+UrlBarTexture::UrlBarTexture() = default;
+
+UrlBarTexture::~UrlBarTexture() = default;
+
+void UrlBarTexture::SetHover(bool hover) {
+  hover_ = hover;
+}
+
+void UrlBarTexture::SetGURL(const GURL& gurl) {
+  gurl_ = gurl;
+}
+
+float UrlBarTexture::ToPixels(float meters) const {
+  return meters * size_.width() / kWidth;
+}
+
+void UrlBarTexture::Draw(SkCanvas* canvas, const gfx::Size& texture_size) {
+  size_.set_height(texture_size.height());
+  size_.set_width(texture_size.width());
+
+  canvas->save();
+  canvas->scale(size_.width() / kWidth, size_.width() / kWidth);
+
+  // Make a gfx canvas to support utility drawing methods.
+  cc::SkiaPaintCanvas paint_canvas(canvas);
+  gfx::Canvas gfx_canvas(&paint_canvas, 1.0f);
+
+  canvas->drawColor(kTextureBackground);
+
+  SkPaint paint;
+  // TODO(cjgrant): Determine if AA is too heavy.
+  paint.setFlags(SkPaint::kAntiAlias_Flag);
+
+  // Back button area.
+  SkRRect round_rect;
+  SkVector rounded_corner = {kHeight / 2, kHeight / 2};
+  SkVector left_corners[4] = {rounded_corner, {0, 0}, {0, 0}, rounded_corner};
+  round_rect.setRectRadii({0, 0, kHeight, kHeight}, left_corners);
+  paint.setColor(hover_ ? kBackgroundHover : kBackground);
+  canvas->drawRRect(round_rect, paint);
+
+  // URL area.
+  paint.setColor(kBackground);
+  SkVector right_corners[4] = {{0, 0}, rounded_corner, rounded_corner, {0, 0}};
+  round_rect.setRectRadii({kHeight, 0, kWidth, kHeight}, right_corners);
+  canvas->drawRRect(round_rect, paint);
+
+  // Back button / URL separator vertical line.
+  paint.setColor(kSeparatorColor);
+  canvas->drawRect(SkRect::MakeXYWH(kHeight, 0, kSeparatorWidth, kHeight),
+                   paint);
+
+  // Back button icon.
+  canvas->save();
+  canvas->translate(kHeight / 2 + kBackIconOffset, kHeight / 2);
+  canvas->translate(-kBackIconHeight / 2, -kBackIconHeight / 2);
+  int icon_default_height = GetDefaultSizeOfVectorIcon(ui::kBackArrowIcon);
+  float icon_scale = kBackIconHeight / icon_default_height;
+  canvas->scale(icon_scale, icon_scale);
+  PaintVectorIcon(&gfx_canvas, ui::kBackArrowIcon, kForeground);
+  canvas->restore();
+
+  // Site security state icon.
+  // TODO(cjgrant): Plug in the correct icons based on security level.

[acondor_, 2017/05/05 19:06:41]

Any specific reason for delaying this for later CLs?

[cjgrant, 2017/05/08 14:17:41]

A few reasons:
- All icons weren't present until I saw Michael's CL. :)
- There's plumbing required to get the security state into this class
- I thought it'd be good to limit the scope of this CL to skia-type work for
easier review

Generally I like more, smaller CLs, but it could go either way.

+  canvas->save();
+  canvas->translate(
+      kBackButtonWidth + kSeparatorWidth + kSecurityFieldWidth / 2,
+      kHeight / 2);
+  canvas->translate(-kSecurityIconHeight / 2, -kSecurityIconHeight / 2);
+  icon_default_height = GetDefaultSizeOfVectorIcon(ui::kBackArrowIcon);
+  icon_scale = kSecurityIconHeight / icon_default_height;
+  canvas->scale(icon_scale, icon_scale);
+  PaintVectorIcon(&gfx_canvas, ui::kBackArrowIcon, kForeground);
+  canvas->restore();
+
+  canvas->restore();
+
+  // Draw text based on pixel sizes rather than meters, for correct font sizing.
+  int pixel_font_height = texture_size.height() * kFontHeight / kHeight;
+  gfx::Font default_font(kDefaultFontFamily, pixel_font_height);
+  int text_flags = gfx::Canvas::TEXT_ALIGN_LEFT;
+  float url_x = kBackButtonWidth + kSeparatorWidth + kSecurityFieldWidth;
+  float url_width = kWidth - url_x - kUrlRightMargin;
+  gfx_canvas.DrawStringRectWithFlags(
+      base::UTF8ToUTF16(gurl_.spec()), gfx::FontList(default_font),
+      SK_ColorBLACK,
+      gfx::Rect(ToPixels(url_x), 0, ToPixels(url_width), ToPixels(kHeight)),
+      text_flags);
+}
+
+gfx::Size UrlBarTexture::GetPreferredTextureSize(int maximum_width) const {
+  return gfx::Size(maximum_width, maximum_width * kHeight / kWidth);
+}
+
+gfx::SizeF UrlBarTexture::GetDrawnSize() const {
+  return size_;
+}
+
+}  // namespace vr_shell