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_CURRENTLY_ON(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_CURRENTLY_ON(BrowserThread::UI);
  30 }
  31
  32 void SoftwareOutputDeviceWin::Resize(const gfx::Size& viewport_pixel_size,
  33                                      float scale_factor) {
  34   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  35
  36   scale_factor_ = scale_factor;
  37
  38   if (viewport_pixel_size_ == viewport_pixel_size)
  39     return;
  40
  41   viewport_pixel_size_ = viewport_pixel_size;
  42   contents_.reset(new gfx::Canvas(viewport_pixel_size, 1.0f, true));
  43   memset(&bitmap_info_, 0, sizeof(bitmap_info_));
  44   gfx::CreateBitmapHeader(viewport_pixel_size_.width(),
  45                           viewport_pixel_size_.height(),
  46                           &bitmap_info_.bmiHeader);
  47 }
  48
  49 SkCanvas* SoftwareOutputDeviceWin::BeginPaint(const gfx::Rect& damage_rect) {
  50   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  51   DCHECK(contents_);
  52
  53   damage_rect_ = damage_rect;
  54   return contents_ ? contents_->sk_canvas() : NULL;
  55 }
  56
  57 void SoftwareOutputDeviceWin::EndPaint(cc::SoftwareFrameData* frame_data) {
  58   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  59   DCHECK(contents_);
  60   DCHECK(frame_data);
  61
  62   if (!contents_)
  63     return;
  64
  65   SoftwareOutputDevice::EndPaint(frame_data);
  66
  67   gfx::Rect rect = damage_rect_;
  68   rect.Intersect(gfx::Rect(viewport_pixel_size_));
  69   if (rect.IsEmpty())
  70     return;
  71
  72   SkCanvas* canvas = contents_->sk_canvas();
  73   DCHECK(canvas);
  74   if (is_hwnd_composited_) {
  75     RECT wr;
  76     GetWindowRect(hwnd_, &wr);
  77     SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
  78     POINT position = {wr.left, wr.top};
  79     POINT zero = {0, 0};
  80     BLENDFUNCTION blend = {AC_SRC_OVER, 0x00, 0xFF, AC_SRC_ALPHA};
  81
  82     DWORD style = GetWindowLong(hwnd_, GWL_EXSTYLE);
  83     style &= ~WS_EX_COMPOSITED;
  84     style |= WS_EX_LAYERED;
  85     SetWindowLong(hwnd_, GWL_EXSTYLE, style);
  86
  87     HDC dib_dc = skia::BeginPlatformPaint(canvas);
  88     ::UpdateLayeredWindow(hwnd_, NULL, &position, &size, dib_dc, &zero,
  89                           RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
  90     skia::EndPlatformPaint(canvas);
  91   } else {
  92     HDC hdc = ::GetDC(hwnd_);
  93     RECT src_rect = rect.ToRECT();
  94     skia::DrawToNativeContext(canvas, hdc, rect.x(), rect.y(), &src_rect);
  95     ::ReleaseDC(hwnd_, hdc);
  96   }
  97 }
  98
  99 void SoftwareOutputDeviceWin::CopyToPixels(const gfx::Rect& rect,
 100                                            void* pixels) {
 101   DCHECK(contents_);
 102   SkImageInfo info = SkImageInfo::MakeN32Premul(rect.width(), rect.height());
 103   contents_->sk_canvas()->readPixels(
 104       info, pixels, info.minRowBytes(), rect.x(), rect.y());
 105 }
 106
 107 }  // namespace content