content/browser/renderer_host/software_output_device_win.cc

   1 // Copyright (c) 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 "content/browser/renderer_host/software_output_device_win.h"
   6
   7 #include "content/public/browser/browser_thread.h"
   8 #include "third_party/skia/include/core/SkBitmap.h"
   9 #include "third_party/skia/include/core/SkDevice.h"
  10 #include "ui/compositor/compositor.h"
  11 #include "ui/gfx/canvas.h"
  12 #include "ui/gfx/canvas_skia_paint.h"
  13 #include "ui/gfx/gdi_util.h"
  14
  15 namespace content {
  16
  17 SoftwareOutputDeviceWin::SoftwareOutputDeviceWin(ui::Compositor* compositor)
  18     : hwnd_(compositor->widget()),
  19       is_hwnd_composited_(false) {
  20   // TODO(skaslev) Remove this when crbug.com/180702 is fixed.
  21   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  22
  23   LONG style = GetWindowLong(hwnd_, GWL_EXSTYLE);
  24   is_hwnd_composited_ = !!(style & WS_EX_COMPOSITED);
  25 }
  26
  27 SoftwareOutputDeviceWin::~SoftwareOutputDeviceWin() {
  28   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  29 }
  30
  31 void SoftwareOutputDeviceWin::Resize(gfx::Size viewport_size) {
  32   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  33
  34   if (viewport_size_ == viewport_size)
  35     return;
  36
  37   viewport_size_ = viewport_size;
  38   contents_.reset(new gfx::Canvas(viewport_size, ui::SCALE_FACTOR_100P, false));
  39   memset(&bitmap_info_, 0, sizeof(bitmap_info_));
  40   gfx::CreateBitmapHeader(viewport_size_.width(), viewport_size_.height(),
  41                           &bitmap_info_.bmiHeader);
  42 }
  43
  44 SkCanvas* SoftwareOutputDeviceWin::BeginPaint(gfx::Rect damage_rect) {
  45   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  46   DCHECK(contents_);
  47
  48   damage_rect_ = damage_rect;
  49   return contents_ ? contents_->sk_canvas() : NULL;
  50 }
  51
  52 void SoftwareOutputDeviceWin::EndPaint(cc::SoftwareFrameData* frame_data) {
  53   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  54   DCHECK(contents_);
  55   DCHECK(frame_data);
  56
  57   if (!contents_)
  58     return;
  59
  60   SoftwareOutputDevice::EndPaint(frame_data);
  61
  62   gfx::Rect rect = damage_rect_;
  63   rect.Intersect(gfx::Rect(viewport_size_));
  64   if (rect.IsEmpty())
  65     return;
  66
  67   SkCanvas* canvas = contents_->sk_canvas();
  68   DCHECK(canvas);
  69   if (is_hwnd_composited_) {
  70     RECT wr;
  71     GetWindowRect(hwnd_, &wr);
  72     SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
  73     POINT position = {wr.left, wr.top};
  74     POINT zero = {0, 0};
  75     BLENDFUNCTION blend = {AC_SRC_OVER, 0x00, 0xFF, AC_SRC_ALPHA};
  76
  77     DWORD style = GetWindowLong(hwnd_, GWL_EXSTYLE);
  78     style &= ~WS_EX_COMPOSITED;
  79     style |= WS_EX_LAYERED;
  80     SetWindowLong(hwnd_, GWL_EXSTYLE, style);
  81
  82     HDC dib_dc = skia::BeginPlatformPaint(canvas);
  83     ::UpdateLayeredWindow(hwnd_, NULL, &position, &size, dib_dc, &zero,
  84                           RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
  85     skia::EndPlatformPaint(canvas);
  86   } else {
  87     SkDevice* device = canvas->getDevice();
  88     const SkBitmap& bitmap = device->accessBitmap(false);
  89     HDC hdc = ::GetDC(hwnd_);
  90     gfx::StretchDIBits(hdc,
  91                        rect.x(), rect.y(),
  92                        rect.width(), rect.height(),
  93                        rect.x(), rect.y(),
  94                        rect.width(), rect.height(),
  95                        bitmap.getPixels(),
  96                        &bitmap_info_);
  97     ::ReleaseDC(hwnd_, hdc);
  98   }
  99 }
 100
 101 }  // namespace content