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/*
* Copyright (C) 2005-2009 Team XBMC
* http://www.xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
* http://www.gnu.org/copyleft/gpl.html
*
*/
#include "DDSImage.h"
#include "XBTF.h"
#include "lib/libsquish/squish.h"
#include <string.h>
#ifndef NO_XBMC_FILESYSTEM
#include "FileSystem/File.h"
using namespace XFILE;
#else
#include "SimpleFS.h"
#endif
CDDSImage::CDDSImage()
{
m_data = NULL;
memset(&m_desc, 0, sizeof(m_desc));
}
CDDSImage::CDDSImage(unsigned int width, unsigned int height, unsigned int format)
{
m_data = NULL;
Allocate(width, height, format);
}
CDDSImage::~CDDSImage()
{
delete[] m_data;
}
unsigned int CDDSImage::GetWidth() const
{
return m_desc.width;
}
unsigned int CDDSImage::GetHeight() const
{
return m_desc.height;
}
unsigned int CDDSImage::GetFormat() const
{
if (strncmp((const char *)&m_desc.pixelFormat.fourcc, "DXT1", 4) == 0)
return XB_FMT_DXT1;
if (strncmp((const char *)&m_desc.pixelFormat.fourcc, "DXT5", 4) == 0)
return XB_FMT_DXT5;
return 0;
}
unsigned int CDDSImage::GetSize() const
{
return m_desc.linearSize;
}
unsigned char *CDDSImage::GetData() const
{
return m_data;
}
bool CDDSImage::ReadFile(const std::string &inputFile)
{
// open the file
CFile file;
if (!file.Open(inputFile))
return false;
// read the header
uint32_t magic;
if (file.Read(&magic, 4) != 4)
return false;
if (file.Read(&m_desc, sizeof(m_desc)) != sizeof(m_desc))
return false;
if (!GetFormat())
return false; // not supported
// allocate our data
m_data = new unsigned char[m_desc.linearSize];
if (!m_data)
return false;
// and read it in
if (file.Read(m_data, m_desc.linearSize) != m_desc.linearSize)
return false;
file.Close();
return true;
}
bool CDDSImage::WriteFile(const std::string &outputFile) const
{
// open the file
CFile file;
if (!file.OpenForWrite(outputFile, true))
return false;
// write the header
file.Write("DDS ", 4);
file.Write(&m_desc, sizeof(m_desc));
// now the data
file.Write(m_data, m_desc.linearSize);
file.Close();
return true;
}
unsigned int CDDSImage::GetStorageRequirements(unsigned int width, unsigned int height, unsigned int format) const
{
unsigned int blockSize = (format == XB_FMT_DXT1) ? 8 : 16;
return ((width + 3) / 4) * ((height + 3) / 4) * blockSize;
}
bool CDDSImage::Compress(unsigned int width, unsigned int height, unsigned int pitch, unsigned char const *brga, double maxMSE)
{
delete[] m_data;
m_data = new unsigned char[GetStorageRequirements(width, height, XB_FMT_DXT1)];
// first try DXT1, which is only 4bits/pixel
Allocate(width, height, XB_FMT_DXT1);
squish::CompressImage(brga, width, height, pitch, m_data, squish::kDxt1 | squish::kSourceBGRA);
if (maxMSE)
{ // want to bother with other formats
double colorMSE, alphaMSE;
squish::ComputeMSE(brga, width, height, pitch, m_data, squish::kDxt1 | squish::kSourceBGRA, colorMSE, alphaMSE);
if (colorMSE < maxMSE && alphaMSE < maxMSE)
return true;
Allocate(width, height, XB_FMT_DXT3);
if (alphaMSE == 0)
{ // no alpha channel, so DXT5YCoCg is going to be the best DXT5 format
/* squish::CompressImage(brga, width, height, pitch, data2, squish::kDxt5 | squish::kSourceBGRA);
squish::ComputeMSE(brga, width, height, pitch, m_data, squish::kDxt5 | squish::kSourceBGRA, colorMSE, alphaMSE);
if (colorMSE < maxMSE && alphaMSE < maxMSE)
{ // success - use it
compressedSize = squish::GetStorageRequirements(width, height, squish::kDxt5);
format = XB_FMT_DXT5_YCoCg;
}
*/
}
if (alphaMSE > 0)
{ // try DXT3 and DXT5 - use whichever is better (color is the same, but alpha will be different)
squish::CompressImage(brga, width, height, pitch, m_data, squish::kDxt3 | squish::kSourceBGRA);
squish::ComputeMSE(brga, width, height, pitch, m_data, squish::kDxt3 | squish::kSourceBGRA, colorMSE, alphaMSE);
if (colorMSE < maxMSE)
{ // color is fine, test DXT5 as well
double dxt5MSE;
unsigned char *data2 = new unsigned char[GetStorageRequirements(width, height, XB_FMT_DXT5)];
squish::CompressImage(brga, width, height, pitch, data2, squish::kDxt5 | squish::kSourceBGRA);
squish::ComputeMSE(brga, width, height, pitch, data2, squish::kDxt5 | squish::kSourceBGRA, colorMSE, alphaMSE);
if (alphaMSE < maxMSE && alphaMSE < dxt5MSE)
{ // DXT3 passes and is best
return true;
}
else if (dxt5MSE < maxMSE)
{ // DXT5 passes
memcpy(&m_desc.pixelFormat.fourcc, "DXT5", 4);
delete[] m_data;
m_data = data2;
return true;
}
delete[] data2;
}
}
return false;
}
return true;
}
void CDDSImage::Allocate(unsigned int width, unsigned int height, unsigned int format)
{
memset(&m_desc, 0, sizeof(m_desc));
m_desc.size = sizeof(m_desc);
m_desc.flags = ddsd_caps | ddsd_pixelformat | ddsd_width | ddsd_height | ddsd_linearsize;
m_desc.height = height;
m_desc.width = width;
m_desc.linearSize = GetStorageRequirements(width, height, format);
m_desc.pixelFormat.size = sizeof(m_desc.pixelFormat);
m_desc.pixelFormat.flags = ddpf_fourcc;
memcpy(&m_desc.pixelFormat.fourcc, GetFourCC(format), 4);
m_desc.caps.flags1 = ddscaps_texture;
delete[] m_data;
m_data = new unsigned char[m_desc.linearSize];
}
const char *CDDSImage::GetFourCC(unsigned int format) const
{
if (format == XB_FMT_DXT1)
return "DXT1";
else if (format == XB_FMT_DXT3)
return "DXT3";
else
return "DXT5";
}
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