components/favicon/core/fallback_icon_service.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/favicon/core/fallback_icon_service.h"
   6
   7 #include <algorithm>
   8
   9 #include "components/favicon/core/fallback_icon_client.h"
  10 #include "components/favicon_base/fallback_icon_style.h"
  11 #include "third_party/skia/include/core/SkPaint.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/codec/png_codec.h"
  14 #include "ui/gfx/font_list.h"
  15 #include "ui/gfx/geometry/rect.h"
  16 #include "ui/gfx/geometry/size.h"
  17 #include "url/gurl.h"
  18
  19 namespace favicon {
  20 namespace {
  21
  22 // Arbitrary maximum icon size, can be reasonably increased if needed.
  23 const int kMaxFallbackFaviconSize = 288;
  24
  25 }  // namespace
  26
  27 FallbackIconService::FallbackIconService(
  28     FallbackIconClient* fallback_icon_client)
  29     : fallback_icon_client_(fallback_icon_client) {
  30 }
  31
  32 FallbackIconService::~FallbackIconService() {
  33 }
  34
  35 std::vector<unsigned char> FallbackIconService::RenderFallbackIconBitmap(
  36     const GURL& icon_url,
  37     int size,
  38     const favicon_base::FallbackIconStyle& style) {
  39   int size_to_use = std::min(kMaxFallbackFaviconSize, size);
  40   gfx::Canvas canvas(gfx::Size(size_to_use, size_to_use), 1.0f, false);
  41   DrawFallbackIcon(icon_url, size_to_use, style, &canvas);
  42
  43   std::vector<unsigned char> bitmap_data;
  44   if (!gfx::PNGCodec::EncodeBGRASkBitmap(canvas.ExtractImageRep().sk_bitmap(),
  45                                          false, &bitmap_data)) {
  46     bitmap_data.clear();
  47   }
  48   return bitmap_data;
  49 }
  50
  51 void FallbackIconService::DrawFallbackIcon(
  52     const GURL& icon_url,
  53     int size,
  54     const favicon_base::FallbackIconStyle& style,
  55     gfx::Canvas* canvas) {
  56   const int kOffsetX = 0;
  57   const int kOffsetY = 0;
  58   SkPaint paint;
  59   paint.setStyle(SkPaint::kFill_Style);
  60   paint.setAntiAlias(true);
  61
  62   // Draw a filled, colored rounded square.
  63   paint.setColor(style.background_color);
  64   int corner_radius = static_cast<int>(size * style.roundness * 0.5 + 0.5);
  65   canvas->DrawRoundRect(
  66       gfx::Rect(kOffsetX, kOffsetY, size, size), corner_radius, paint);
  67
  68   // Draw text.
  69   base::string16 icon_text =
  70       fallback_icon_client_->GetFallbackIconText(icon_url);
  71   if (icon_text.empty())
  72     return;
  73   int font_size = static_cast<int>(size * style.font_size_ratio);
  74   if (font_size <= 0)
  75     return;
  76
  77   canvas->DrawStringRectWithFlags(
  78       icon_text,
  79       gfx::FontList(fallback_icon_client_->GetFontNameList(), gfx::Font::NORMAL,
  80                     font_size),
  81       style.text_color,
  82       gfx::Rect(kOffsetX, kOffsetY, size, size),
  83       gfx::Canvas::TEXT_ALIGN_CENTER);
  84 }
  85
  86 }  // namespace favicon