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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/compositor/software_output_device_win.h"
#include "content/public/browser/browser_thread.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkDevice.h"
#include "ui/compositor/compositor.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/canvas_skia_paint.h"
#include "ui/gfx/gdi_util.h"
#include "ui/gfx/skia_util.h"
namespace content {
SoftwareOutputDeviceWin::SoftwareOutputDeviceWin(ui::Compositor* compositor)
: hwnd_(compositor->widget()),
is_hwnd_composited_(false) {
// TODO(skaslev) Remove this when crbug.com/180702 is fixed.
DCHECK_CURRENTLY_ON(BrowserThread::UI);
LONG style = GetWindowLong(hwnd_, GWL_EXSTYLE);
is_hwnd_composited_ = !!(style & WS_EX_COMPOSITED);
}
SoftwareOutputDeviceWin::~SoftwareOutputDeviceWin() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
}
void SoftwareOutputDeviceWin::Resize(const gfx::Size& viewport_pixel_size,
float scale_factor) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
scale_factor_ = scale_factor;
if (viewport_pixel_size_ == viewport_pixel_size)
return;
viewport_pixel_size_ = viewport_pixel_size;
contents_.reset(new gfx::Canvas(viewport_pixel_size, 1.0f, true));
memset(&bitmap_info_, 0, sizeof(bitmap_info_));
gfx::CreateBitmapHeader(viewport_pixel_size_.width(),
viewport_pixel_size_.height(),
&bitmap_info_.bmiHeader);
}
SkCanvas* SoftwareOutputDeviceWin::BeginPaint(const gfx::Rect& damage_rect) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(contents_);
damage_rect_ = damage_rect;
return contents_ ? contents_->sk_canvas() : NULL;
}
void SoftwareOutputDeviceWin::EndPaint(cc::SoftwareFrameData* frame_data) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(contents_);
DCHECK(frame_data);
if (!contents_)
return;
SoftwareOutputDevice::EndPaint(frame_data);
gfx::Rect rect = damage_rect_;
rect.Intersect(gfx::Rect(viewport_pixel_size_));
if (rect.IsEmpty())
return;
SkCanvas* canvas = contents_->sk_canvas();
DCHECK(canvas);
if (is_hwnd_composited_) {
RECT wr;
GetWindowRect(hwnd_, &wr);
SIZE size = {wr.right - wr.left, wr.bottom - wr.top};
POINT position = {wr.left, wr.top};
POINT zero = {0, 0};
BLENDFUNCTION blend = {AC_SRC_OVER, 0x00, 0xFF, AC_SRC_ALPHA};
DWORD style = GetWindowLong(hwnd_, GWL_EXSTYLE);
style &= ~WS_EX_COMPOSITED;
style |= WS_EX_LAYERED;
SetWindowLong(hwnd_, GWL_EXSTYLE, style);
HDC dib_dc = skia::BeginPlatformPaint(canvas);
::UpdateLayeredWindow(hwnd_, NULL, &position, &size, dib_dc, &zero,
RGB(0xFF, 0xFF, 0xFF), &blend, ULW_ALPHA);
skia::EndPlatformPaint(canvas);
} else {
HDC hdc = ::GetDC(hwnd_);
RECT src_rect = rect.ToRECT();
skia::DrawToNativeContext(canvas, hdc, rect.x(), rect.y(), &src_rect);
::ReleaseDC(hwnd_, hdc);
}
}
void SoftwareOutputDeviceWin::CopyToPixels(const gfx::Rect& rect,
void* pixels) {
DCHECK(contents_);
SkImageInfo info = SkImageInfo::MakeN32Premul(rect.width(), rect.height());
contents_->sk_canvas()->readPixels(
info, pixels, info.minRowBytes(), rect.x(), rect.y());
}
} // namespace content
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