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// Copyright 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#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
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