/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include "tilebuffer.hxx"

static const int DPI = 96;

static float pixelToTwip(float fInput, float zoom)
{
    return (fInput / DPI / zoom) * 1440.0f;
}

static float twipToPixel(float fInput, float zoom)
{
    return fInput / 1440.0f * DPI * zoom;
}

GdkPixbuf* Tile::tile_get_buffer()
{
  return m_pBuffer;
}

void Tile::tile_release()
{
  gdk_pixbuf_unref(m_pBuffer);
  m_pBuffer = NULL;
}

void TileBuffer::tile_buffer_set_zoom(float newZoomFactor, int rows, int columns)
{
  m_fZoomFactor = newZoomFactor;

  tile_buffer_reset_all_tiles();

  // set new buffer width and height
  m_nWidth = columns;
  m_nHeight = rows;
  m_aTiles.resize(m_nWidth * m_nHeight);
}

void TileBuffer::tile_buffer_reset_all_tiles()
{
  for (size_t i = 0; i < m_aTiles.size(); i++)
    {
      m_aTiles[i].tile_release();
    }
  m_aTiles.clear();
}

Tile& TileBuffer::tile_buffer_get_tile(int x, int y)
{
  int index = x * m_nWidth + y;
  if(!m_aTiles[index].valid)
    {
      GdkPixbuf* pPixBuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, m_nTileSize, m_nTileSize);
      if (!pPixBuf){
        g_info ("error allocating memory to pixbuf");
      }
      unsigned char* pBuffer = gdk_pixbuf_get_pixels(pPixBuf);
      GdkRectangle aTileRectangle;
      aTileRectangle.x = pixelToTwip(m_nTileSize, m_fZoomFactor) * y;
      aTileRectangle.y = pixelToTwip(m_nTileSize, m_fZoomFactor) * x;

      g_info ("rendering (%d %d)", x, y);
      m_pLOKDocument->pClass->paintTile(m_pLOKDocument,
                                        // Buffer and its size, depends on the position only.
                                        pBuffer,
                                        m_nTileSize, m_nTileSize,
                                        // Position of the tile.
                                        aTileRectangle.x, aTileRectangle.y,
                                        // Size of the tile, depends on the zoom factor and the tile position only.
                                        pixelToTwip(m_nTileSize, m_fZoomFactor), pixelToTwip(m_nTileSize, m_fZoomFactor));

      m_aTiles[index].tile_set_pixbuf(pPixBuf);
      m_aTiles[index].valid = 1;
    }

  return m_aTiles[index];
}

void Tile::tile_set_pixbuf(GdkPixbuf *buffer)
{
  m_pBuffer = buffer;
}