Initial import attempt, just to play with. Many things disabled/removed

ui/cc/TilingData.cpp

Index: ui/cc/TilingData.cpp
diff --git a/ui/cc/TilingData.cpp b/ui/cc/TilingData.cpp
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+++ b/ui/cc/TilingData.cpp
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+/*
+ * Copyright (c) 2010, Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if USE(ACCELERATED_COMPOSITING) || ENABLE(ACCELERATED_2D_CANVAS)
+
+#include "TilingData.h"
+
+#include "FloatRect.h"
+#include "IntRect.h"
+#include <algorithm>
+
+using namespace std;
+
+namespace WebCore {
+
+static int computeNumTiles(int maxTextureSize, int totalSize, int borderTexels)
+{
+    if (maxTextureSize - 2 * borderTexels <= 0)
+        return totalSize > 0 && maxTextureSize >= totalSize ? 1 : 0;
+
+    int numTiles = max(1, 1 + (totalSize - 1 - 2 * borderTexels) / (maxTextureSize - 2 * borderTexels));
+    return totalSize > 0 ? numTiles : 0;
+}
+
+TilingData::TilingData(const IntSize& maxTextureSize, const IntSize& totalSize, bool hasBorderTexels)
+    : m_maxTextureSize(maxTextureSize)
+    , m_totalSize(totalSize)
+    , m_borderTexels(hasBorderTexels ? 1 : 0)
+{
+    recomputeNumTiles();
+}
+
+void TilingData::setTotalSize(const IntSize& totalSize)
+{
+    m_totalSize = totalSize;
+    recomputeNumTiles();
+}
+
+void TilingData::setMaxTextureSize(const IntSize& maxTextureSize)
+{
+    m_maxTextureSize = maxTextureSize;
+    recomputeNumTiles();
+}
+
+void TilingData::setHasBorderTexels(bool hasBorderTexels)
+{
+    m_borderTexels = hasBorderTexels ? 1 : 0;
+    recomputeNumTiles();
+}
+
+int TilingData::tileXIndexFromSrcCoord(int srcPos) const
+{
+    if (numTilesX() <= 1)
+        return 0;
+
+    ASSERT(m_maxTextureSize.width() - 2 * m_borderTexels);
+    int x = (srcPos - m_borderTexels) / (m_maxTextureSize.width() - 2 * m_borderTexels);
+    return min(max(x, 0), numTilesX() - 1);
+}
+
+int TilingData::tileYIndexFromSrcCoord(int srcPos) const
+{
+    if (numTilesY() <= 1)
+        return 0;
+
+    ASSERT(m_maxTextureSize.height() - 2 * m_borderTexels);
+    int y = (srcPos - m_borderTexels) / (m_maxTextureSize.height() - 2 * m_borderTexels);
+    return min(max(y, 0), numTilesY() - 1);
+}
+
+IntRect TilingData::tileBounds(int i, int j) const
+{
+    assertTile(i, j);
+    int x = tilePositionX(i);
+    int y = tilePositionY(j);
+    int width = tileSizeX(i);
+    int height = tileSizeY(j);
+    ASSERT(x >= 0 && y >= 0 && width >= 0 && height >= 0);
+    ASSERT(x <= m_totalSize.width() && y <= m_totalSize.height());
+    return IntRect(x, y, width, height);
+}
+
+IntRect TilingData::tileBoundsWithBorder(int i, int j) const
+{
+    IntRect bounds = tileBounds(i, j);
+
+    if (m_borderTexels) {
+        int x1 = bounds.x();
+        int x2 = bounds.maxX();
+        int y1 = bounds.y();
+        int y2 = bounds.maxY();
+
+        if (i > 0)
+            x1--;
+        if (i < (numTilesX() - 1))
+            x2++;
+        if (j > 0)
+            y1--;
+        if (j < (numTilesY() - 1))
+            y2++;
+
+        bounds = IntRect(x1, y1, x2 - x1, y2 - y1);
+    }
+
+    return bounds;
+}
+
+int TilingData::tilePositionX(int xIndex) const
+{
+    ASSERT(xIndex >= 0 && xIndex < numTilesX());
+
+    int pos = 0;
+    for (int i = 0; i < xIndex; i++)
+        pos += tileSizeX(i);
+
+    return pos;
+}
+
+int TilingData::tilePositionY(int yIndex) const
+{
+    ASSERT(yIndex >= 0 && yIndex < numTilesY());
+
+    int pos = 0;
+    for (int i = 0; i < yIndex; i++)
+        pos += tileSizeY(i);
+
+    return pos;
+}
+
+int TilingData::tileSizeX(int xIndex) const
+{
+    ASSERT(xIndex >= 0 && xIndex < numTilesX());
+
+    if (!xIndex && m_numTilesX == 1)
+        return m_totalSize.width();
+    if (!xIndex && m_numTilesX > 1)
+        return m_maxTextureSize.width() - m_borderTexels;
+    if (xIndex < numTilesX() - 1)
+        return m_maxTextureSize.width() - 2 * m_borderTexels;
+    if (xIndex == numTilesX() - 1)
+        return m_totalSize.width() - tilePositionX(xIndex);
+
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+int TilingData::tileSizeY(int yIndex) const
+{
+    ASSERT(yIndex >= 0 && yIndex < numTilesY());
+
+    if (!yIndex && m_numTilesY == 1)
+        return m_totalSize.height();
+    if (!yIndex && m_numTilesY > 1)
+        return m_maxTextureSize.height() - m_borderTexels;
+    if (yIndex < numTilesY() - 1)
+        return m_maxTextureSize.height() - 2 * m_borderTexels;
+    if (yIndex == numTilesY() - 1)
+        return m_totalSize.height() - tilePositionY(yIndex);
+
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+IntPoint TilingData::textureOffset(int xIndex, int yIndex) const
+{
+    int left = (!xIndex || m_numTilesX == 1) ? 0 : m_borderTexels;
+    int top = (!yIndex || m_numTilesY == 1) ? 0 : m_borderTexels;
+
+    return IntPoint(left, top);
+}
+
+void TilingData::recomputeNumTiles()
+{
+    m_numTilesX = computeNumTiles(m_maxTextureSize.width(), m_totalSize.width(), m_borderTexels);
+    m_numTilesY = computeNumTiles(m_maxTextureSize.height(), m_totalSize.height(), m_borderTexels);
+}
+
+}
+
+#endif