Create cc::TilingData based on WebCore::TilingData.

cc/tiling_data.cc

+// Copyright 2010 The Chromium Authors. All rights reserved.

[tfarina, 2012/11/02 00:25:45]

2010 -> 2012?

[danakj, 2012/11/02 00:28:03]

Keeping the year from the old file, as this is a copy/change of that.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"

[tfarina, 2012/11/02 00:25:45]

what is this for?

[danakj, 2012/11/02 00:28:03]

same as all the other .cc in cc/ until we are clear of webcore.

+
+#include "cc/tiling_data.h"
+
+#include <algorithm>
+
+#include "ui/gfx/rect.h"
+#include "ui/gfx/vector2d.h"
+
+namespace cc {
+
+static int ComputeNumTiles(int max_texture_size, int total_size, int border_texels) {
+  if (max_texture_size - 2 * border_texels <= 0)
+    return total_size > 0 && max_texture_size >= total_size ? 1 : 0;
+
+  int num_tiles = std::max(1, 1 + (total_size - 1 - 2 * border_texels) / (max_texture_size - 2 * border_texels));
+  return total_size > 0 ? num_tiles : 0;
+}
+
+TilingData::TilingData(gfx::Size max_texture_size, gfx::Size total_size, bool hasBorderTexels)
+    : max_texture_size_(max_texture_size),
+      total_size_(total_size),
+      border_texels_(hasBorderTexels ? 1 : 0) {
+  RecomputeNumTiles();
+}
+
+TilingData::~TilingData() {
+}
+
+void TilingData::SetTotalSize(gfx::Size total_size) {
+  total_size_ = total_size;
+  RecomputeNumTiles();
+}
+
+void TilingData::SetMaxTextureSize(gfx::Size max_texture_size) {
+  max_texture_size_ = max_texture_size;
+  RecomputeNumTiles();
+}
+
+void TilingData::SetHasBorderTexels(bool has_border_texels) {
+  border_texels_ = has_border_texels ? 1 : 0;
+  RecomputeNumTiles();
+}
+
+int TilingData::TileXIndexFromSrcCoord(int src_position) const {
+  if (num_tiles_x_ <= 1)
+    return 0;
+
+  DCHECK(max_texture_size_.width() - 2 * border_texels_);
+  int x = (src_position - border_texels_) / (max_texture_size_.width() - 2 * border_texels_);
+  return std::min(std::max(x, 0), num_tiles_x_ - 1);
+}
+
+int TilingData::TileYIndexFromSrcCoord(int src_position) const {
+  if (num_tiles_y_ <= 1)
+    return 0;
+
+  DCHECK(max_texture_size_.height() - 2 * border_texels_);
+  int y = (src_position - border_texels_) / (max_texture_size_.height() - 2 * border_texels_);
+  return std::min(std::max(y, 0), num_tiles_y_ - 1);
+}
+
+gfx::Rect 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);
+  DCHECK_GE(x, 0);
+  DCHECK_GE(y, 0);
+  DCHECK_GE(width, 0);
+  DCHECK_GE(height, 0);
+  DCHECK_LE(x, total_size_.width());
+  DCHECK_LE(y, total_size_.height());
+  return gfx::Rect(x, y, width, height);
+}
+
+gfx::Rect TilingData::TileBoundsWithBorder(int i, int j) const {
+  gfx::Rect bounds = TileBounds(i, j);
+
+  if (border_texels_) {
+    int x1 = bounds.x();
+    int x2 = bounds.right();
+    int y1 = bounds.y();
+    int y2 = bounds.bottom();
+
+    if (i > 0)
+      x1--;
+    if (i < (num_tiles_x_ - 1))
+      x2++;
+    if (j > 0)
+      y1--;
+    if (j < (num_tiles_y_ - 1))
+      y2++;
+
+    bounds = gfx::Rect(x1, y1, x2 - x1, y2 - y1);
+  }
+
+  return bounds;
+}
+
+int TilingData::TilePositionX(int x_index) const {
+  DCHECK_GE(x_index, 0);
+  DCHECK_LT(x_index, num_tiles_x_);
+
+  int pos = 0;
+  for (int i = 0; i < x_index; i++)
+    pos += TileSizeX(i);
+
+  return pos;
+}
+
+int TilingData::TilePositionY(int y_index) const {
+  DCHECK_GE(y_index, 0);
+  DCHECK_LT(y_index, num_tiles_y_);
+
+  int pos = 0;
+  for (int i = 0; i < y_index; i++)
+    pos += TileSizeY(i);
+
+  return pos;
+}
+
+int TilingData::TileSizeX(int x_index) const {
+  DCHECK_GE(x_index, 0);
+  DCHECK_LT(x_index, num_tiles_x_);
+
+  if (!x_index && num_tiles_x_ == 1)
+    return total_size_.width();
+  if (!x_index && num_tiles_x_ > 1)
+    return max_texture_size_.width() - border_texels_;
+  if (x_index < num_tiles_x_ - 1)
+    return max_texture_size_.width() - 2 * border_texels_;
+  if (x_index == num_tiles_x_ - 1)
+    return total_size_.width() - TilePositionX(x_index);
+
+  NOTREACHED();
+  return 0;
+}
+
+int TilingData::TileSizeY(int y_index) const {
+  DCHECK_GE(y_index, 0);
+  DCHECK_LT(y_index, num_tiles_y_);
+
+  if (!y_index && num_tiles_y_ == 1)
+    return total_size_.height();
+  if (!y_index && num_tiles_y_ > 1)
+    return max_texture_size_.height() - border_texels_;
+  if (y_index < num_tiles_y_ - 1)
+    return max_texture_size_.height() - 2 * border_texels_;
+  if (y_index == num_tiles_y_ - 1)
+    return total_size_.height() - TilePositionY(y_index);
+
+  NOTREACHED();
+  return 0;
+}
+
+gfx::Vector2d TilingData::TextureOffset(int x_index, int y_index) const {
+  int left = (!x_index || num_tiles_x_ == 1) ? 0 : border_texels_;
+  int top = (!y_index || num_tiles_y_ == 1) ? 0 : border_texels_;
+
+  return gfx::Vector2d(left, top);
+}
+
+void TilingData::RecomputeNumTiles() {
+  num_tiles_x_ = ComputeNumTiles(max_texture_size_.width(), total_size_.width(), border_texels_);
+  num_tiles_y_ = ComputeNumTiles(max_texture_size_.height(), total_size_.height(), border_texels_);
+}
+
+}  // namespace cc