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/*
Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "Tile.h"
#if ENABLE(TILED_BACKING_STORE)
#include "GraphicsContext.h"
#include "TiledBackingStore.h"
#include "TiledBackingStoreClient.h"
#include <QApplication>
#include <QObject>
#include <QPainter>
#include <QRegion>
namespace WebCore {
static const unsigned checkerSize = 16;
static const unsigned checkerColor1 = 0xff555555;
static const unsigned checkerColor2 = 0xffaaaaaa;
static QPixmap& checkeredPixmap()
{
static QPixmap* pixmap;
if (!pixmap) {
pixmap = new QPixmap(checkerSize, checkerSize);
QPainter painter(pixmap);
QColor color1(checkerColor1);
QColor color2(checkerColor2);
for (unsigned y = 0; y < checkerSize; y += checkerSize / 2) {
bool alternate = y % checkerSize;
for (unsigned x = 0; x < checkerSize; x += checkerSize / 2) {
painter.fillRect(x, y, checkerSize / 2, checkerSize / 2, alternate ? color1 : color2);
alternate = !alternate;
}
}
}
return *pixmap;
}
Tile::Tile(TiledBackingStore* backingStore, const Coordinate& tileCoordinate)
: m_backingStore(backingStore)
, m_coordinate(tileCoordinate)
, m_rect(m_backingStore->tileRectForCoordinate(tileCoordinate))
, m_buffer(0)
, m_backBuffer(0)
, m_dirtyRegion(new QRegion(m_rect))
{
}
Tile::~Tile()
{
delete m_buffer;
delete m_backBuffer;
delete m_dirtyRegion;
}
bool Tile::isDirty() const
{
return !m_dirtyRegion->isEmpty();
}
bool Tile::isReadyToPaint() const
{
return m_buffer;
}
void Tile::invalidate(const IntRect& dirtyRect)
{
IntRect tileDirtyRect = intersection(dirtyRect, m_rect);
if (tileDirtyRect.isEmpty())
return;
*m_dirtyRegion += tileDirtyRect;
}
void Tile::updateBackBuffer()
{
if (m_buffer && !isDirty())
return;
if (!m_backBuffer) {
if (!m_buffer) {
m_backBuffer = new QPixmap(m_backingStore->m_tileSize.width(), m_backingStore->m_tileSize.height());
m_backBuffer->fill(m_backingStore->m_client->tiledBackingStoreBackgroundColor());
} else {
// Currently all buffers are updated synchronously at the same time so there is no real need
// to have separate back and front buffers. Just use the existing buffer.
m_backBuffer = m_buffer;
m_buffer = 0;
}
}
QVector<QRect> dirtyRects = m_dirtyRegion->rects();
*m_dirtyRegion = QRegion();
QPainter painter(m_backBuffer);
GraphicsContext context(&painter);
context.translate(-m_rect.x(), -m_rect.y());
int size = dirtyRects.size();
for (int n = 0; n < size; ++n) {
context.save();
IntRect rect = dirtyRects[n];
context.clip(FloatRect(rect));
context.scale(FloatSize(m_backingStore->m_contentsScale, m_backingStore->m_contentsScale));
m_backingStore->m_client->tiledBackingStorePaint(&context, m_backingStore->mapToContents(rect));
context.restore();
}
}
void Tile::swapBackBufferToFront()
{
if (!m_backBuffer)
return;
delete m_buffer;
m_buffer = m_backBuffer;
m_backBuffer = 0;
}
void Tile::paint(GraphicsContext* context, const IntRect& rect)
{
if (!m_buffer)
return;
IntRect target = intersection(rect, m_rect);
IntRect source((target.x() - m_rect.x()),
(target.y() - m_rect.y()),
target.width(),
target.height());
context->platformContext()->drawPixmap(target, *m_buffer, source);
}
void Tile::paintCheckerPattern(GraphicsContext* context, const FloatRect& target)
{
QPainter* painter = context->platformContext();
QTransform worldTransform = painter->worldTransform();
qreal scaleX = worldTransform.m11();
qreal scaleY = worldTransform.m22();
QRect targetViewRect = QRectF(target.x() * scaleX,
target.y() * scaleY,
target.width() * scaleX,
target.height() * scaleY).toAlignedRect();
QTransform adjustedTransform(1., worldTransform.m12(), worldTransform.m13(),
worldTransform.m21(), 1., worldTransform.m23(),
worldTransform.m31(), worldTransform.m32(), worldTransform.m33());
painter->setWorldTransform(adjustedTransform);
painter->drawTiledPixmap(targetViewRect,
checkeredPixmap(),
QPoint(targetViewRect.left() % checkerSize,
targetViewRect.top() % checkerSize));
painter->setWorldTransform(worldTransform);
}
}
#endif
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