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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"
#if USE(ACCELERATED_COMPOSITING) && USE(TEXTURE_MAPPER)
#include "TextureMapperTiledBackingStore.h"
#include "ImageBuffer.h"
#include "TextureMapper.h"
namespace WebCore {
class GraphicsLayer;
TextureMapperTiledBackingStore::TextureMapperTiledBackingStore()
{
}
void TextureMapperTiledBackingStore::updateContentsFromImageIfNeeded(TextureMapper* textureMapper)
{
if (!m_image)
return;
updateContents(textureMapper, m_image.get(), m_image->size(), m_image->rect(), BitmapTexture::UpdateCannotModifyOriginalImageData);
m_image.clear();
}
TransformationMatrix TextureMapperTiledBackingStore::adjustedTransformForRect(const FloatRect& targetRect)
{
return TransformationMatrix::rectToRect(rect(), targetRect);
}
void TextureMapperTiledBackingStore::paintToTextureMapper(TextureMapper* textureMapper, const FloatRect& targetRect, const TransformationMatrix& transform, float opacity)
{
updateContentsFromImageIfNeeded(textureMapper);
TransformationMatrix adjustedTransform = transform * adjustedTransformForRect(targetRect);
for (size_t i = 0; i < m_tiles.size(); ++i)
m_tiles[i].paint(textureMapper, adjustedTransform, opacity, calculateExposedTileEdges(rect(), m_tiles[i].rect()));
}
void TextureMapperTiledBackingStore::drawBorder(TextureMapper* textureMapper, const Color& borderColor, float borderWidth, const FloatRect& targetRect, const TransformationMatrix& transform)
{
TransformationMatrix adjustedTransform = transform * adjustedTransformForRect(targetRect);
for (size_t i = 0; i < m_tiles.size(); ++i)
textureMapper->drawBorder(borderColor, borderWidth, m_tiles[i].rect(), adjustedTransform);
}
void TextureMapperTiledBackingStore::drawRepaintCounter(TextureMapper* textureMapper, int repaintCount, const Color& borderColor, const FloatRect& targetRect, const TransformationMatrix& transform)
{
TransformationMatrix adjustedTransform = transform * adjustedTransformForRect(targetRect);
for (size_t i = 0; i < m_tiles.size(); ++i)
textureMapper->drawNumber(repaintCount, borderColor, m_tiles[i].rect().location(), adjustedTransform);
}
void TextureMapperTiledBackingStore::createOrDestroyTilesIfNeeded(const FloatSize& size, const IntSize& tileSize, bool hasAlpha, IntRect& repaintRect)
{
if (size == m_size)
return;
m_size = size;
Vector<FloatRect> tileRectsToAdd;
Vector<int> tileIndicesToRemove;
static const size_t TileEraseThreshold = 6;
// This method recycles tiles. We check which tiles we need to add, which to remove, and use as many
// removable tiles as replacement for new tiles when possible.
for (float y = 0; y < m_size.height(); y += tileSize.height()) {
for (float x = 0; x < m_size.width(); x += tileSize.width()) {
FloatRect tileRect(x, y, tileSize.width(), tileSize.height());
tileRect.intersect(rect());
tileRectsToAdd.append(tileRect);
}
}
// Check which tiles need to be removed, and which already exist.
for (int i = m_tiles.size() - 1; i >= 0; --i) {
FloatRect oldTile = m_tiles[i].rect();
bool existsAlready = false;
for (int j = tileRectsToAdd.size() - 1; j >= 0; --j) {
FloatRect newTile = tileRectsToAdd[j];
if (oldTile != newTile)
continue;
// A tile that we want to add already exists, no need to add or remove it.
existsAlready = true;
tileRectsToAdd.remove(j);
break;
}
// This tile is not needed.
if (!existsAlready) {
tileIndicesToRemove.append(i);
// If the removed tile was painted ensure the area it covered is repainted.
if (m_tiles[i].texture())
repaintRect.unite(enclosingIntRect(oldTile));
}
}
// Recycle removable tiles to be used for newly requested tiles.
for (size_t i = 0; i < tileRectsToAdd.size(); ++i) {
if (!tileIndicesToRemove.isEmpty()) {
// We recycle an existing tile for usage with a new tile rect.
TextureMapperTile& tile = m_tiles[tileIndicesToRemove.last()];
tileIndicesToRemove.removeLast();
tile.setRect(tileRectsToAdd[i]);
if (tile.texture())
tile.texture()->reset(enclosingIntRect(tile.rect()).size(), hasAlpha ? BitmapTexture::SupportsAlpha : 0);
continue;
}
m_tiles.append(TextureMapperTile(tileRectsToAdd[i]));
}
// Remove unnecessary tiles, if they weren't recycled.
// We use a threshold to make sure we don't create/destroy tiles too eagerly.
for (size_t i = 0; i < tileIndicesToRemove.size() && m_tiles.size() > TileEraseThreshold; ++i)
m_tiles.remove(tileIndicesToRemove[i]);
}
void TextureMapperTiledBackingStore::updateContents(TextureMapper* textureMapper, Image* image, const FloatSize& totalSize, const IntRect& dirtyRect, BitmapTexture::UpdateContentsFlag updateContentsFlag)
{
IntRect repaintRect(dirtyRect);
createOrDestroyTilesIfNeeded(totalSize, textureMapper->maxTextureSize(), !image->currentFrameKnownToBeOpaque(), repaintRect);
for (size_t i = 0; i < m_tiles.size(); ++i)
m_tiles[i].updateContents(textureMapper, image, repaintRect, updateContentsFlag);
}
void TextureMapperTiledBackingStore::updateContents(TextureMapper* textureMapper, GraphicsLayer* sourceLayer, const FloatSize& totalSize, const IntRect& dirtyRect, BitmapTexture::UpdateContentsFlag updateContentsFlag)
{
IntRect repaintRect(dirtyRect);
createOrDestroyTilesIfNeeded(totalSize, textureMapper->maxTextureSize(), true, repaintRect);
for (size_t i = 0; i < m_tiles.size(); ++i)
m_tiles[i].updateContents(textureMapper, sourceLayer, repaintRect, updateContentsFlag);
}
PassRefPtr<BitmapTexture> TextureMapperTiledBackingStore::texture() const
{
for (size_t i = 0; i < m_tiles.size(); ++i) {
RefPtr<BitmapTexture> texture = m_tiles[i].texture();
if (texture)
return texture;
}
return PassRefPtr<BitmapTexture>();
}
} // namespace WebCore
#endif
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