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/profiler/scoped_tracker.h"
   8 #include "base/strings/utf_string_conversions.h"
   9 #include "ui/base/layout.h"
  10 #include "ui/gfx/canvas.h"
  11 #include "ui/views/widget/widget.h"
  12
  13 namespace app_list {
  14
  15 CachedLabel::CachedLabel()
  16     : needs_repaint_(true) {
  17 }
  18
  19 void CachedLabel::PaintToBackingImage() {
  20   // TODO(vadimt): Remove ScopedTracker below once crbug.com/431326 is fixed.
  21   tracked_objects::ScopedTracker tracking_profile1(
  22       FROM_HERE_WITH_EXPLICIT_FUNCTION(
  23           "431326 CachedLabel::PaintToBackingImage1"));
  24
  25   if (image_.size() == size() && !needs_repaint_)
  26     return;
  27
  28   bool is_opaque = SkColorGetA(background_color()) == 0xFF;
  29   float scale_factor =
  30       ui::GetScaleFactorForNativeView(GetWidget()->GetNativeView());
  31   gfx::Canvas canvas(size(), scale_factor, is_opaque);
  32   // If a background is provided, it will initialize the canvas in
  33   // View::OnPaintBackground(). Otherwise, the background must be set here.
  34   if (!background()) {
  35     // TODO(vadimt): Remove ScopedTracker below once crbug.com/431326 is fixed.
  36     tracked_objects::ScopedTracker tracking_profile2(
  37         FROM_HERE_WITH_EXPLICIT_FUNCTION(
  38             "431326 CachedLabel::PaintToBackingImage2"));
  39
  40     canvas.FillRect(
  41         GetLocalBounds(), background_color(), SkXfermode::kSrc_Mode);
  42   }
  43
  44   // TODO(vadimt): Remove ScopedTracker below once crbug.com/431326 is fixed.
  45   tracked_objects::ScopedTracker tracking_profile3(
  46       FROM_HERE_WITH_EXPLICIT_FUNCTION(
  47           "431326 CachedLabel::PaintToBackingImage3"));
  48
  49   Label::OnPaint(&canvas);
  50
  51   // TODO(vadimt): Remove ScopedTracker below once crbug.com/431326 is fixed.
  52   tracked_objects::ScopedTracker tracking_profile4(
  53       FROM_HERE_WITH_EXPLICIT_FUNCTION(
  54           "431326 CachedLabel::PaintToBackingImage4"));
  55
  56   image_ = gfx::ImageSkia(canvas.ExtractImageRep());
  57   needs_repaint_ = false;
  58 }
  59
  60 #if defined(OS_WIN)
  61 void CachedLabel::OnPaint(gfx::Canvas* canvas) {
  62   PaintToBackingImage();
  63   canvas->DrawImageInt(image_, 0, 0);
  64 }
  65 #endif
  66
  67 void CachedLabel::OnDeviceScaleFactorChanged(
  68     float device_scale_factor) {
  69   Invalidate();
  70   View::OnDeviceScaleFactorChanged(device_scale_factor);
  71 }
  72
  73 }  // namespace app_list