1 files changed, 191 insertions, 0 deletions
diff --git a/Source/WebKit2/Shared/CoordinatedGraphics/CoordinatedBackingStore.cpp b/Source/WebKit2/Shared/CoordinatedGraphics/CoordinatedBackingStore.cpp
new file mode 100644
index 000000000..bb46942a1
--- /dev/null
+++ b/Source/WebKit2/Shared/CoordinatedGraphics/CoordinatedBackingStore.cpp
@@ -0,0 +1,191 @@
+/*
+ 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 <WebCore/CoordinatedSurface.h>
+#include <WebCore/GraphicsLayer.h>
+#include <WebCore/TextureMapper.h>
+#include <WebCore/TextureMapperGL.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+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;
+    }
+
+    if (m_surface->supportsAlpha() == texture->isOpaque())
+        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 = nullptr;
+}
+
+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);
+}
+
+RefPtr<BitmapTexture> CoordinatedBackingStore::texture() const
+{
+    for (auto& tile : m_tiles.values()) {
+        RefPtr<BitmapTexture> texture = tile.texture();
+        if (texture)
+            return texture;
+    }
+
+    return RefPtr<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 (auto& tile : tiles)
+        tile->paint(textureMapper, transform, opacity, calculateExposedTileEdges(rect, tile->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)