ui/app_list/views/cached_label.cc

   1 // Copyright 2013 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 "ui/app_list/views/cached_label.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "ui/base/resource/resource_bundle.h"
   9 #include "ui/gfx/canvas.h"
  10
  11 namespace app_list {
  12
  13 CachedLabel::CachedLabel()
  14     : needs_repaint_(true) {
  15 }
  16
  17 void CachedLabel::PaintToBackingImage() {
  18   if (image_.size() == size() && !needs_repaint_)
  19     return;
  20   gfx::Canvas canvas(size(), 1.0f, false /* is_opaque */);
  21   canvas.FillRect(GetLocalBounds(), SkColorSetARGB(0, 0, 0, 0),
  22                   SkXfermode::kSrc_Mode);
  23   Label::OnPaint(&canvas);
  24   image_ = gfx::ImageSkia(canvas.ExtractImageRep());
  25   needs_repaint_ = false;
  26 }
  27
  28 #if defined(OS_WIN)
  29 void CachedLabel::OnPaint(gfx::Canvas* canvas) {
  30   PaintToBackingImage();
  31   canvas->DrawImageInt(image_, 0, 0);
  32 }
  33 #endif
  34
  35 }  // namespace app_list