content/browser/compositor/software_output_device_win.cc

   1 // Copyright 2014 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/compositor/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 #include "ui/gfx/skia_util.h"
  15
  16 namespace content {
  17
  18 SoftwareOutputDeviceWin::SoftwareOutputDeviceWin(ui::Compositor* compositor)
  19     : hwnd_(compositor->widget()),
  20       is_hwnd_composited_(false) {
  21   // TODO(skaslev) Remove this when crbug.com/180702 is fixed.
  22   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  23
  24   LONG style = GetWindowLong(hwnd_, GWL_EXSTYLE);
  25   is_hwnd_composited_ = !!(style & WS_EX_COMPOSITED);
  26 }
  27
  28 SoftwareOutputDeviceWin::~SoftwareOutputDeviceWin() {
  29   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  30 }
  31
  32 void SoftwareOutputDeviceWin::Resize(const gfx::Size& viewport_size) {
  33   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  34
  35   if (viewport_size_ == viewport_size)
  36     return;
  37
  38   viewport_size_ = viewport_size;
  39   contents_.reset(new gfx::Canvas(viewport_size, 1.0f, true));
  40   memset(&bitmap_info_, 0, sizeof(bitmap_info_));
  41   gfx::CreateBitmapHeader(viewport_size_.width(), viewport_size_.height(),
  42                           &bitmap_info_.bmiHeader);
  43 }
  44
  45 SkCanvas* SoftwareOutputDeviceWin::BeginPaint(const gfx::Rect& damage_rect) {
  46   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  47   DCHECK(contents_);
  48
  49   damage_rect_ = damage_rect;
  50   return contents_ ? contents_->sk_canvas() : NULL;
  51 }
  52
  53 void SoftwareOutputDeviceWin::EndPaint(cc::SoftwareFrameData* frame_data) {
  54   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  55   DCHECK(contents_);
  56   DCHECK(frame_data);
  57
  58   if (!contents_)
  59     return;
  60
  61   SoftwareOutputDevice::EndPaint(frame_data);
  62
  63   gfx::Rect rect = damage_rect_;
  64   rect.Intersect(gfx::Rect(viewport_size_));
  65   if (rect.IsEmpty())
  66     return;
  67
  68   SkCanvas* canvas = contents_->sk_canvas();
  69   DCHECK(canvas);
  70   if (is_hwnd_composited_) {
  71     RECT wr;
  72     GetWindowRect(hwnd_, &wr);
  73     SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
  74     POINT position = {wr.left, wr.top};
  75     POINT zero = {0, 0};
  76     BLENDFUNCTION blend = {AC_SRC_OVER, 0x00, 0xFF, AC_SRC_ALPHA};
  77
  78     DWORD style = GetWindowLong(hwnd_, GWL_EXSTYLE);
  79     style &= ~WS_EX_COMPOSITED;
  80     style |= WS_EX_LAYERED;
  81     SetWindowLong(hwnd_, GWL_EXSTYLE, style);
  82
  83     HDC dib_dc = skia::BeginPlatformPaint(canvas);
  84     ::UpdateLayeredWindow(hwnd_, NULL, &position, &size, dib_dc, &zero,
  85                           RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
  86     skia::EndPlatformPaint(canvas);
  87   } else {
  88     HDC hdc = ::GetDC(hwnd_);
  89     RECT src_rect = rect.ToRECT();
  90     skia::DrawToNativeContext(canvas, hdc, rect.x(), rect.y(), &src_rect);
  91     ::ReleaseDC(hwnd_, hdc);
  92   }
  93 }
  94
  95 void SoftwareOutputDeviceWin::CopyToPixels(const gfx::Rect& rect,
  96                                            void* pixels) {
  97   DCHECK(contents_);
  98   SkImageInfo info = SkImageInfo::MakeN32Premul(rect.width(), rect.height());
  99   contents_->sk_canvas()->readPixels(
 100       info, pixels, info.minRowBytes(), rect.x(), rect.y());
 101 }
 102
 103 }  // namespace content