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/*
Copyright (C) 2012 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 "CoordinatedBackingStore.h"
#if USE(COORDINATED_GRAPHICS)
#include "GraphicsLayer.h"
#include "TextureMapper.h"
#include "TextureMapperGL.h"
#include <WebCore/CoordinatedSurface.h>
namespace WebCore {
void CoordinatedBackingStoreTile::swapBuffers(TextureMapper* textureMapper)
{
if (!m_surface)
return;
FloatRect tileRect(m_tileRect);
tileRect.scale(1. / m_scale);
bool shouldReset = false;
if (tileRect != rect()) {
setRect(tileRect);
shouldReset = true;
}
RefPtr<BitmapTexture> texture = this->texture();
if (!texture) {
texture = textureMapper->createTexture();
setTexture(texture.get());
shouldReset = true;
}
ASSERT(textureMapper->maxTextureSize().width() >= m_tileRect.size().width());
ASSERT(textureMapper->maxTextureSize().height() >= m_tileRect.size().height());
if (shouldReset)
texture->reset(m_tileRect.size(), m_surface->supportsAlpha());
m_surface->copyToTexture(texture, m_sourceRect, m_surfaceOffset);
m_surface.clear();
}
void CoordinatedBackingStoreTile::setBackBuffer(const IntRect& tileRect, const IntRect& sourceRect, PassRefPtr<CoordinatedSurface> buffer, const IntPoint& offset)
{
m_sourceRect = sourceRect;
m_tileRect = tileRect;
m_surfaceOffset = offset;
m_surface = buffer;
}
void CoordinatedBackingStore::createTile(uint32_t id, float scale)
{
m_tiles.add(id, CoordinatedBackingStoreTile(scale));
m_scale = scale;
}
void CoordinatedBackingStore::removeTile(uint32_t id)
{
ASSERT(m_tiles.contains(id));
m_tilesToRemove.add(id);
}
void CoordinatedBackingStore::removeAllTiles()
{
for (auto& key : m_tiles.keys())
m_tilesToRemove.add(key);
}
void CoordinatedBackingStore::updateTile(uint32_t id, const IntRect& sourceRect, const IntRect& tileRect, PassRefPtr<CoordinatedSurface> backBuffer, const IntPoint& offset)
{
CoordinatedBackingStoreTileMap::iterator it = m_tiles.find(id);
ASSERT(it != m_tiles.end());
it->value.setBackBuffer(tileRect, sourceRect, backBuffer, offset);
}
PassRefPtr<BitmapTexture> CoordinatedBackingStore::texture() const
{
CoordinatedBackingStoreTileMap::const_iterator end = m_tiles.end();
for (CoordinatedBackingStoreTileMap::const_iterator it = m_tiles.begin(); it != end; ++it) {
RefPtr<BitmapTexture> texture = it->value.texture();
if (texture)
return texture;
}
return PassRefPtr<BitmapTexture>();
}
void CoordinatedBackingStore::setSize(const FloatSize& size)
{
m_pendingSize = size;
}
void CoordinatedBackingStore::paintTilesToTextureMapper(Vector<TextureMapperTile*>& tiles, TextureMapper* textureMapper, const TransformationMatrix& transform, float opacity, const FloatRect& rect)
{
for (size_t i = 0; i < tiles.size(); ++i)
tiles[i]->paint(textureMapper, transform, opacity, calculateExposedTileEdges(rect, tiles[i]->rect()));
}
TransformationMatrix CoordinatedBackingStore::adjustedTransformForRect(const FloatRect& targetRect)
{
return TransformationMatrix::rectToRect(rect(), targetRect);
}
void CoordinatedBackingStore::paintToTextureMapper(TextureMapper* textureMapper, const FloatRect& targetRect, const TransformationMatrix& transform, float opacity)
{
if (m_tiles.isEmpty())
return;
ASSERT(!m_size.isZero());
Vector<TextureMapperTile*> tilesToPaint;
Vector<TextureMapperTile*> previousTilesToPaint;
// We have to do this every time we paint, in case the opacity has changed.
FloatRect coveredRect;
for (auto& tile : m_tiles.values()) {
if (!tile.texture())
continue;
if (tile.scale() == m_scale) {
tilesToPaint.append(&tile);
coveredRect.unite(tile.rect());
continue;
}
// Only show the previous tile if the opacity is high, otherwise effect looks like a bug.
// We show the previous-scale tile anyway if it doesn't intersect with any current-scale tile.
if (opacity < 0.95 && coveredRect.intersects(tile.rect()))
continue;
previousTilesToPaint.append(&tile);
}
// targetRect is on the contents coordinate system, so we must compare two rects on the contents coordinate system.
// See TiledBackingStore.
TransformationMatrix adjustedTransform = transform * adjustedTransformForRect(targetRect);
paintTilesToTextureMapper(previousTilesToPaint, textureMapper, adjustedTransform, opacity, rect());
paintTilesToTextureMapper(tilesToPaint, textureMapper, adjustedTransform, opacity, rect());
}
void CoordinatedBackingStore::drawBorder(TextureMapper* textureMapper, const Color& borderColor, float borderWidth, const FloatRect& targetRect, const TransformationMatrix& transform)
{
TransformationMatrix adjustedTransform = transform * adjustedTransformForRect(targetRect);
for (auto& tile : m_tiles.values())
textureMapper->drawBorder(borderColor, borderWidth, tile.rect(), adjustedTransform);
}
void CoordinatedBackingStore::drawRepaintCounter(TextureMapper* textureMapper, int repaintCount, const Color& borderColor, const FloatRect& targetRect, const TransformationMatrix& transform)
{
TransformationMatrix adjustedTransform = transform * adjustedTransformForRect(targetRect);
for (auto& tile : m_tiles.values())
textureMapper->drawNumber(repaintCount, borderColor, tile.rect().location(), adjustedTransform);
}
void CoordinatedBackingStore::commitTileOperations(TextureMapper* textureMapper)
{
if (!m_pendingSize.isZero()) {
m_size = m_pendingSize;
m_pendingSize = FloatSize();
}
for (auto& tileToRemove : m_tilesToRemove)
m_tiles.remove(tileToRemove);
m_tilesToRemove.clear();
for (auto& tile : m_tiles.values())
tile.swapBuffers(textureMapper);
}
} // namespace WebCore
#endif // USE(COORDINATED_GRAPHICS)
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