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favicon_utils.cc
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favicon_utils.cc
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// Copyright (c) 2012 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/favicon/favicon_utils.h"
#include "base/hash/sha1.h"
#include "build/build_config.h"
#include "chrome/browser/favicon/favicon_service_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/search/search.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/platform_locale_settings.h"
#include "components/favicon/content/content_favicon_driver.h"
#include "components/favicon/core/fallback_url_util.h"
#include "content/public/browser/navigation_controller.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/common/favicon_url.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_utils.h"
#include "ui/gfx/font_list.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/native_theme/native_theme.h"
#include "ui/resources/grit/ui_resources.h"
namespace favicon {
namespace {
// The color of the letter drawn for a fallback icon. Changing this may require
// changing the algorithm in ReturnRenderedIconForRequest() that guarantees
// contrast.
constexpr SkColor kFallbackIconLetterColor = SK_ColorWHITE;
// Desaturate favicon HSL shift values.
const double kDesaturateHue = -1.0;
const double kDesaturateSaturation = 0.0;
const double kDesaturateLightness = 0.6;
// Draws a circle of a given |size| and |offset| in the |canvas| and fills it
// with |background_color|.
void DrawCircleInCanvas(gfx::Canvas* canvas,
int size,
int offset,
SkColor background_color) {
cc::PaintFlags flags;
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setAntiAlias(true);
flags.setColor(background_color);
int corner_radius = size / 2;
canvas->DrawRoundRect(gfx::Rect(offset, offset, size, size), corner_radius,
flags);
}
// Will paint the appropriate letter in the center of specified |canvas| of
// given |size|.
void DrawFallbackIconLetter(const GURL& icon_url,
int size,
int offset,
gfx::Canvas* canvas) {
// Get the appropriate letter to draw, then eventually draw it.
base::string16 icon_text = favicon::GetFallbackIconText(icon_url);
if (icon_text.empty())
return;
const double kDefaultFontSizeRatio = 0.5;
int font_size = static_cast<int>(size * kDefaultFontSizeRatio);
if (font_size <= 0)
return;
gfx::Font::Weight font_weight = gfx::Font::Weight::NORMAL;
#if defined(OS_WIN)
font_weight = gfx::Font::Weight::SEMIBOLD;
#endif
// TODO(crbug.com/853780): Adjust the text color according to the background
// color.
canvas->DrawStringRectWithFlags(
icon_text,
gfx::FontList({l10n_util::GetStringUTF8(IDS_NTP_FONT_FAMILY)},
gfx::Font::NORMAL, font_size, font_weight),
kFallbackIconLetterColor, gfx::Rect(offset, offset, size, size),
gfx::Canvas::TEXT_ALIGN_CENTER);
}
// Returns a color based on the hash of |icon_url|'s origin.
SkColor ComputeBackgroundColorForUrl(const GURL& icon_url) {
if (!icon_url.is_valid())
return SK_ColorGRAY;
unsigned char hash[20];
const std::string origin = icon_url.GetOrigin().spec();
base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(origin.c_str()),
origin.size(), hash);
return SkColorSetRGB(hash[0], hash[1], hash[2]);
}
} // namespace
void CreateContentFaviconDriverForWebContents(
content::WebContents* web_contents) {
DCHECK(web_contents);
if (ContentFaviconDriver::FromWebContents(web_contents))
return;
Profile* original_profile =
Profile::FromBrowserContext(web_contents->GetBrowserContext())
->GetOriginalProfile();
return ContentFaviconDriver::CreateForWebContents(
web_contents,
FaviconServiceFactory::GetForProfile(original_profile,
ServiceAccessType::IMPLICIT_ACCESS));
}
SkBitmap GenerateMonogramFavicon(GURL url, int icon_size, int circle_size) {
SkBitmap bitmap;
bitmap.allocN32Pixels(icon_size, icon_size, false);
cc::SkiaPaintCanvas paint_canvas(bitmap);
gfx::Canvas canvas(&paint_canvas, 1.f);
canvas.DrawColor(SK_ColorTRANSPARENT, SkBlendMode::kSrc);
SkColor fallback_color =
color_utils::BlendForMinContrast(ComputeBackgroundColorForUrl(url),
kFallbackIconLetterColor)
.color;
int offset = (icon_size - circle_size) / 2;
DrawCircleInCanvas(&canvas, circle_size, offset, fallback_color);
DrawFallbackIconLetter(url, circle_size, offset, &canvas);
return bitmap;
}
bool ShouldDisplayFavicon(content::WebContents* web_contents) {
// No favicon on interstitials.
if (web_contents->ShowingInterstitialPage())
return false;
// Suppress the icon for the new-tab page, even if a navigation to it is
// not committed yet. Note that we're looking at the visible URL, so
// navigations from NTP generally don't hit this case and still show an icon.
GURL url = web_contents->GetVisibleURL();
if (url.SchemeIs(content::kChromeUIScheme) &&
url.host_piece() == chrome::kChromeUINewTabHost) {
return false;
}
// Also suppress instant-NTP. This does not use search::IsInstantNTP since
// it looks at the last-committed entry and we need to show icons for pending
// navigations away from it.
if (search::IsInstantNTPURL(url, Profile::FromBrowserContext(
web_contents->GetBrowserContext()))) {
return false;
}
// Otherwise, always display the favicon.
return true;
}
gfx::Image TabFaviconFromWebContents(content::WebContents* contents) {
DCHECK(contents);
favicon::FaviconDriver* favicon_driver =
favicon::ContentFaviconDriver::FromWebContents(contents);
gfx::Image favicon = favicon_driver->GetFavicon();
// Desaturate the favicon if the navigation entry contains a network error.
if (!contents->IsLoadingToDifferentDocument()) {
content::NavigationController& controller = contents->GetController();
content::NavigationEntry* entry = controller.GetLastCommittedEntry();
if (entry && (entry->GetPageType() == content::PAGE_TYPE_ERROR)) {
color_utils::HSL shift = {kDesaturateHue, kDesaturateSaturation,
kDesaturateLightness};
return gfx::Image(gfx::ImageSkiaOperations::CreateHSLShiftedImage(
*favicon.ToImageSkia(), shift));
}
}
return favicon;
}
gfx::Image GetDefaultFavicon() {
const ui::NativeTheme* native_theme =
ui::NativeTheme::GetInstanceForNativeUi();
bool is_dark = native_theme && native_theme->ShouldUseDarkColors();
int resource_id = is_dark ? IDR_DEFAULT_FAVICON_DARK : IDR_DEFAULT_FAVICON;
return ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
resource_id);
}
} // namespace favicon