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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtWebEngine module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "backing_store_qt.h"
#include "type_conversion.h"
#include "content/public/browser/render_process_host.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/vector2d_conversions.h"
#include "skia/ext/platform_canvas.h"
#include <QPainter>
#include <QScreen>
#include <QSizeF>
#include <QWindow>
QT_BEGIN_NAMESPACE
// from qbackingstore.cpp
extern void qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset);
QT_END_NAMESPACE
BackingStoreQt::BackingStoreQt(content::RenderWidgetHost *host, const gfx::Size &size, QWindow* parent)
: content::BackingStore(host, size)
, m_deviceScaleFactor((parent && parent->screen()) ? parent->screen()->devicePixelRatio() : 1)
, m_pixelBuffer(size.width() * m_deviceScaleFactor, size.height() * m_deviceScaleFactor, QImage::Format_ARGB32_Premultiplied)
{
}
BackingStoreQt::~BackingStoreQt()
{
}
void BackingStoreQt::paintToTarget(QPainter* painter, const QRectF& clipRect)
{
if (m_pixelBuffer.isNull())
return;
QRectF rect = clipRect.isNull() ? m_pixelBuffer.rect() : clipRect;
qreal x = rect.x() * m_deviceScaleFactor;
qreal y = rect.y() * m_deviceScaleFactor;
qreal w = rect.width() * m_deviceScaleFactor;
qreal h = rect.height() * m_deviceScaleFactor;
QRectF source(x, y, w, h);
painter->drawImage(rect, m_pixelBuffer, source);
}
void BackingStoreQt::PaintToBackingStore(content::RenderProcessHost *process,
TransportDIB::Id bitmap,
const gfx::Rect &bitmap_rect,
const std::vector<gfx::Rect> ©_rects,
float scale_factor,
const base::Closure &completion_callback,
bool *scheduled_completion_callback)
{
if (bitmap_rect.IsEmpty())
return;
*scheduled_completion_callback = false;
TransportDIB* dib = process->GetTransportDIB(bitmap);
if (!dib)
return;
gfx::Rect pixel_bitmap_rect = gfx::ToEnclosingRect(gfx::ScaleRect(bitmap_rect, scale_factor));
uint8_t* bitmapData = static_cast<uint8_t*>(dib->memory());
const QImage img(bitmapData, pixel_bitmap_rect.width(), pixel_bitmap_rect.height(), QImage::Format_ARGB32);
QPainter painter(&m_pixelBuffer);
for (size_t i = 0; i < copy_rects.size(); ++i) {
gfx::Rect copy_rect = gfx::ToEnclosingRect(gfx::ScaleRect(copy_rects[i], scale_factor));
QRect source = QRect( copy_rect.x() - pixel_bitmap_rect.x()
, copy_rect.y() - pixel_bitmap_rect.y()
, copy_rect.width()
, copy_rect.height());
gfx::Rect copy_rect_dst = gfx::ToEnclosingRect(gfx::ScaleRect(copy_rects[i], m_deviceScaleFactor));
QRect destination = QRect( copy_rect_dst.x()
, copy_rect_dst.y()
, copy_rect_dst.width()
, copy_rect_dst.height());
#if defined(OS_ANDROID)
// The received image format is BGRA with Android so we have to swizzle the image data.
painter.drawImage(destination, img.rgbSwapped(), source);
#else
painter.drawImage(destination, img, source);
#endif
}
}
void BackingStoreQt::ScrollBackingStore(const gfx::Vector2d &delta, const gfx::Rect &clip_rect, const gfx::Size &view_size)
{
DCHECK(delta.x() == 0 || delta.y() == 0);
gfx::Rect pixel_rect = gfx::ToEnclosingRect(gfx::ScaleRect(clip_rect, m_deviceScaleFactor));
gfx::Vector2d pixel_delta = gfx::ToFlooredVector2d(gfx::ScaleVector2d(delta, m_deviceScaleFactor));
// Logic borrowed from QPixmap::scroll and QRasterPlatformPixmap::scroll.
QRect dest = toQt(pixel_rect) & m_pixelBuffer.rect();
QRect src = dest.translated(-pixel_delta.x(), -pixel_delta.y()) & dest;
qt_scrollRectInImage(m_pixelBuffer, src, QPoint(pixel_delta.x(), pixel_delta.y()));
}
bool BackingStoreQt::CopyFromBackingStore(const gfx::Rect &rect, skia::PlatformBitmap *output)
{
const int width = std::min(m_pixelBuffer.width(), rect.width());
const int height = std::min(m_pixelBuffer.height(), rect.height());
if (!output->Allocate(width, height, true))
return false;
// This code assumes a visual mode where a pixel is
// represented using a 32-bit unsigned int, with a byte per component.
const SkBitmap& bitmap = output->GetBitmap();
if (bitmap.rowBytes() != 4)
return false;
SkAutoLockPixels alp(bitmap);
QImage cpy = m_pixelBuffer.copy(rect.x(), rect.y(), rect.width(), rect.height());
// Convert the format and remove transparency.
if (cpy.format() != QImage::Format_RGB32)
cpy = cpy.convertToFormat(QImage::Format_RGB32);
const uint8_t* src = cpy.bits();
uint8_t* dst = reinterpret_cast<uint8_t*>(bitmap.getAddr32(0,0));
int bytesPerLine = cpy.bytesPerLine();
int bytesPerPixel = bytesPerLine / cpy.width();
int copyLineLength = width * bytesPerPixel;
int lineOffset = rect.y() * cpy.width();
int rowOffset = rect.x() * bytesPerPixel;
const uint8_t* copyLineBegin = src + rowOffset + lineOffset;
for (int lineNumber = 0; lineNumber < height; ++lineNumber) {
memcpy(dst, copyLineBegin, copyLineLength);
dst += copyLineLength;
copyLineBegin += cpy.width();
}
return true;
}
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