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/layout.h" 9 #include "ui/gfx/canvas.h" 10 #include "ui/views/widget/widget.h" 11 12 namespace app_list { 13 CachedLabel()14CachedLabel::CachedLabel() 15 : needs_repaint_(true) { 16 } 17 PaintToBackingImage()18void CachedLabel::PaintToBackingImage() { 19 if (image_.size() == size() && !needs_repaint_) 20 return; 21 22 bool is_opaque = SkColorGetA(background_color()) == 0xFF; 23 float scale_factor = 24 ui::GetScaleFactorForNativeView(GetWidget()->GetNativeView()); 25 gfx::Canvas canvas(size(), scale_factor, is_opaque); 26 // If a background is provided, it will initialize the canvas in 27 // View::OnPaintBackground(). Otherwise, the background must be set here. 28 if (!background()) { 29 canvas.FillRect( 30 GetLocalBounds(), background_color(), SkXfermode::kSrc_Mode); 31 } 32 Label::OnPaint(&canvas); 33 image_ = gfx::ImageSkia(canvas.ExtractImageRep()); 34 needs_repaint_ = false; 35 } 36 37 #if defined(OS_WIN) OnPaint(gfx::Canvas * canvas)38void CachedLabel::OnPaint(gfx::Canvas* canvas) { 39 PaintToBackingImage(); 40 canvas->DrawImageInt(image_, 0, 0); 41 } 42 #endif 43 OnDeviceScaleFactorChanged(float device_scale_factor)44void CachedLabel::OnDeviceScaleFactorChanged( 45 float device_scale_factor) { 46 Invalidate(); 47 View::OnDeviceScaleFactorChanged(device_scale_factor); 48 } 49 50 } // namespace app_list 51