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Diffstat (limited to 'src/core/backing_store_qt.cpp')
| -rw-r--r-- | src/core/backing_store_qt.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/core/backing_store_qt.cpp b/src/core/backing_store_qt.cpp new file mode 100644 index 000000000..b12f09f18 --- /dev/null +++ b/src/core/backing_store_qt.cpp @@ -0,0 +1,182 @@ +/**************************************************************************** +** +** 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& rect) +{ + if (m_pixelBuffer.isNull()) + return; + + 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()); + + painter.drawImage(destination, img, source); + } +} + +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; +} + |