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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)
#include "TextureMapperBackingStore.h"
#include "GraphicsLayer.h"
#include "ImageBuffer.h"
#include "TextureMapper.h"
#if USE(GRAPHICS_SURFACE)
#include "GraphicsSurface.h"
#include "TextureMapperGL.h"
#endif
namespace WebCore {
#if USE(GRAPHICS_SURFACE)
void TextureMapperSurfaceBackingStore::setGraphicsSurface(const GraphicsSurfaceToken& graphicsSurfaceToken, const IntSize& surfaceSize, uint32_t frontBuffer)
{
if (graphicsSurfaceToken != m_graphicsSurfaceToken) {
GraphicsSurface::Flags surfaceFlags = GraphicsSurface::SupportsTextureTarget
| GraphicsSurface::SupportsSharing;
setSurface(GraphicsSurface::create(surfaceSize, surfaceFlags, graphicsSurfaceToken));
m_graphicsSurfaceSize = surfaceSize;
}
RefPtr<WebCore::GraphicsSurface> surface = graphicsSurface();
if (surface->frontBuffer() != frontBuffer)
surface->swapBuffers();
}
PassRefPtr<BitmapTexture> TextureMapperSurfaceBackingStore::texture() const
{
// FIXME: Instead of just returning an empty texture, we should wrap the texture contents into a BitmapTexture.
RefPtr<BitmapTexture> emptyTexture;
return emptyTexture;
}
void TextureMapperSurfaceBackingStore::paintToTextureMapper(TextureMapper* textureMapper, const FloatRect& targetRect, const TransformationMatrix& transform, float opacity, BitmapTexture* mask)
{
m_graphicsSurface->paintToTextureMapper(textureMapper, targetRect, transform, opacity, mask);
}
void TextureMapperSurfaceBackingStore::setSurface(PassRefPtr<GraphicsSurface> surface)
{
if (surface) {
m_graphicsSurface = surface;
m_graphicsSurfaceToken = m_graphicsSurface->exportToken();
} else {
m_graphicsSurface = RefPtr<GraphicsSurface>();
m_graphicsSurfaceToken = GraphicsSurfaceToken();
}
}
#endif
void TextureMapperTile::updateContents(TextureMapper* textureMapper, Image* image, const IntRect& dirtyRect)
{
IntRect targetRect = enclosingIntRect(m_rect);
targetRect.intersect(dirtyRect);
if (targetRect.isEmpty())
return;
IntPoint sourceOffset = targetRect.location();
// Normalize sourceRect to the buffer's coordinates.
sourceOffset.move(-dirtyRect.x(), -dirtyRect.y());
// Normalize targetRect to the texture's coordinates.
targetRect.move(-m_rect.x(), -m_rect.y());
if (!m_texture) {
m_texture = textureMapper->createTexture();
m_texture->reset(targetRect.size(), image->currentFrameHasAlpha() ? BitmapTexture::SupportsAlpha : 0);
}
m_texture->updateContents(image, targetRect, sourceOffset);
}
void TextureMapperTile::paint(TextureMapper* textureMapper, const TransformationMatrix& transform, float opacity, BitmapTexture* mask, const unsigned exposedEdges)
{
if (texture().get())
textureMapper->drawTexture(*texture().get(), rect(), transform, opacity, mask, exposedEdges);
}
TextureMapperTiledBackingStore::TextureMapperTiledBackingStore()
: m_drawsDebugBorders(false)
{
}
void TextureMapperTiledBackingStore::updateContentsFromImageIfNeeded(TextureMapper* textureMapper)
{
if (!m_image)
return;
updateContents(textureMapper, m_image.get());
m_image.clear();
}
unsigned TextureMapperBackingStore::calculateExposedTileEdges(const FloatRect& totalRect, const FloatRect& tileRect)
{
unsigned exposedEdges = TextureMapper::NoEdges;
if (!tileRect.x())
exposedEdges |= TextureMapper::LeftEdge;
if (!tileRect.y())
exposedEdges |= TextureMapper::TopEdge;
if (tileRect.width() + tileRect.x() >= totalRect.width())
exposedEdges |= TextureMapper::RightEdge;
if (tileRect.height() + tileRect.y() >= totalRect.height())
exposedEdges |= TextureMapper::BottomEdge;
return exposedEdges;
}
void TextureMapperTiledBackingStore::paintToTextureMapper(TextureMapper* textureMapper, const FloatRect& targetRect, const TransformationMatrix& transform, float opacity, BitmapTexture* mask)
{
updateContentsFromImageIfNeeded(textureMapper);
TransformationMatrix adjustedTransform = transform;
adjustedTransform.multiply(TransformationMatrix::rectToRect(rect(), targetRect));
for (size_t i = 0; i < m_tiles.size(); ++i) {
m_tiles[i].paint(textureMapper, adjustedTransform, opacity, mask, calculateExposedTileEdges(rect(), m_tiles[i].rect()));
if (m_drawsDebugBorders)
textureMapper->drawBorder(m_debugBorderColor, m_debugBorderWidth, m_tiles[i].rect(), adjustedTransform);
}
}
void TextureMapperTiledBackingStore::createOrDestroyTilesIfNeeded(const FloatSize& size, const IntSize& tileSize, bool hasAlpha)
{
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);
}
// 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)
{
createOrDestroyTilesIfNeeded(totalSize, textureMapper->maxTextureSize(), image->currentFrameHasAlpha());
for (size_t i = 0; i < m_tiles.size(); ++i)
m_tiles[i].updateContents(textureMapper, image, dirtyRect);
}
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>();
}
void TextureMapperTiledBackingStore::setDebugBorder(const Color& color, float width)
{
m_debugBorderColor = color;
m_debugBorderWidth = width;
}
}
#endif
|
