C++ GetPitch函数代码示例

void CBaseTexture::ClampToEdge()
{
  unsigned int imagePitch = GetPitch(m_imageWidth);
  unsigned int imageRows = GetRows(m_imageHeight);
  unsigned int texturePitch = GetPitch(m_textureWidth);
  unsigned int textureRows = GetRows(m_textureHeight);
  if (imagePitch < texturePitch)
  {
    unsigned int blockSize = GetBlockSize();
    unsigned char *src = m_pixels + imagePitch - blockSize;
    unsigned char *dst = m_pixels;
    for (unsigned int y = 0; y < imageRows; y++)
    {
      for (unsigned int x = imagePitch; x < texturePitch; x += blockSize)
        memcpy(dst + x, src, blockSize);
      dst += texturePitch;
    }
  }

  if (imageRows < textureRows)
  {
    unsigned char *dst = m_pixels + imageRows * texturePitch;
    for (unsigned int y = imageRows; y < textureRows; y++)
    {
      memcpy(dst, dst - texturePitch, texturePitch);
      dst += texturePitch;
    }
  }
}

void CBaseTexture::Allocate(unsigned int width, unsigned int height, unsigned int format)
{
  m_imageWidth = width;
  m_imageHeight = height;
  m_format = format;
  m_orientation = 0;

  m_textureWidth = m_imageWidth;
  m_textureHeight = m_imageHeight;

  if (m_format & XB_FMT_DXT_MASK)
    while (GetPitch() < g_Windowing.GetMinDXTPitch())
      m_textureWidth += GetBlockSize();

  if (!g_Windowing.SupportsNPOT((m_format & XB_FMT_DXT_MASK) != 0))
  {
    m_textureWidth = PadPow2(m_textureWidth);
    m_textureHeight = PadPow2(m_textureHeight);
  }
  if (m_format & XB_FMT_DXT_MASK)
  { // DXT textures must be a multiple of 4 in width and height
    m_textureWidth = ((m_textureWidth + 3) / 4) * 4;
    m_textureHeight = ((m_textureHeight + 3) / 4) * 4;
  }

  // check for max texture size
  #define CLAMP(x, y) { if (x > y) x = y; }
  CLAMP(m_textureWidth, g_Windowing.GetMaxTextureSize());
  CLAMP(m_textureHeight, g_Windowing.GetMaxTextureSize());
  CLAMP(m_imageWidth, m_textureWidth);
  CLAMP(m_imageHeight, m_textureHeight);

  delete[] m_pixels;
  m_pixels = new unsigned char[GetPitch() * GetRows()];
}

void CBaseTexture::Update(unsigned int width, unsigned int height, unsigned int pitch, unsigned int format, const unsigned char *pixels, bool loadToGPU)
{
  if (pixels == NULL)
    return;

  if (format & XB_FMT_DXT_MASK)
    return;

  Allocate(width, height, format);

  unsigned int srcPitch = pitch ? pitch : GetPitch(width);
  unsigned int srcRows = GetRows(height);
  unsigned int dstPitch = GetPitch(m_textureWidth);
  unsigned int dstRows = GetRows(m_textureHeight);

  if (srcPitch == dstPitch)
    memcpy(m_pixels, pixels, srcPitch * std::min(srcRows, dstRows));
  else
  {
    const unsigned char *src = pixels;
    unsigned char* dst = m_pixels;
    for (unsigned int y = 0; y < srcRows && y < dstRows; y++)
    {
      memcpy(dst, src, std::min(srcPitch, dstPitch));
      src += srcPitch;
      dst += dstPitch;
    }
  }
  ClampToEdge();

  if (loadToGPU)
    LoadToGPU();
}

void CBaseTexture::Allocate(unsigned int width, unsigned int height, unsigned int format)
{
  m_imageWidth = m_originalWidth = width;
  m_imageHeight = m_originalHeight = height;
  m_format = format;
  m_orientation = 0;

  m_textureWidth = m_imageWidth;
  m_textureHeight = m_imageHeight;

  if (m_format & XB_FMT_DXT_MASK)
    while (GetPitch() < CServiceBroker::GetRenderSystem().GetMinDXTPitch())
      m_textureWidth += GetBlockSize();

  if (!CServiceBroker::GetRenderSystem().SupportsNPOT((m_format & XB_FMT_DXT_MASK) != 0))
  {
    m_textureWidth = PadPow2(m_textureWidth);
    m_textureHeight = PadPow2(m_textureHeight);
  }
  if (m_format & XB_FMT_DXT_MASK)
  { // DXT textures must be a multiple of 4 in width and height
    m_textureWidth = ((m_textureWidth + 3) / 4) * 4;
    m_textureHeight = ((m_textureHeight + 3) / 4) * 4;
  }
  else
  {
    // align all textures so that they have an even width
    // in some circumstances when we downsize a thumbnail
    // which has an uneven number of pixels in width
    // we crash in CPicture::ScaleImage in ffmpegs swscale
    // because it tries to access beyond the source memory
    // (happens on osx and ios)
    // UPDATE: don't just update to be on an even width;
    // ffmpegs swscale relies on a 16-byte stride on some systems
    // so the textureWidth needs to be a multiple of 16. see ffmpeg
    // swscale headers for more info.
    m_textureWidth = ((m_textureWidth + 15) / 16) * 16;
  }

  // check for max texture size
  #define CLAMP(x, y) { if (x > y) x = y; }
  CLAMP(m_textureWidth, CServiceBroker::GetRenderSystem().GetMaxTextureSize());
  CLAMP(m_textureHeight, CServiceBroker::GetRenderSystem().GetMaxTextureSize());
  CLAMP(m_imageWidth, m_textureWidth);
  CLAMP(m_imageHeight, m_textureHeight);

  _aligned_free(m_pixels);
  m_pixels = NULL;
  if (GetPitch() * GetRows() > 0)
  {
    size_t size = GetPitch() * GetRows();
    m_pixels = (unsigned char*) _aligned_malloc(size, 32);

    if (m_pixels == nullptr)
    {
      CLog::Log(LOGERROR, "%s - Could not allocate %zu bytes. Out of memory.", __FUNCTION__, size);
    }
  }
}

Vector3d cPlayer::GetThrowStartPos(void) const
{
	Vector3d res = GetEyePosition();
	
	// Adjust the position to be just outside the player's bounding box:
	res.x += 0.16 * cos(GetPitch());
	res.y += -0.1;
	res.z += 0.16 * sin(GetPitch());
	
	return res;
}

void CSSE2Surface32Intrinsic::OnCreated()
{
	ASSERT(GetBitDepth() == 32);
	ASSERT((GetPitch() & 0xF) == 0);
	ASSERT(GetVisibleWidth() && GetVisibleHeight());
	ASSERT(sizeof(RGBQUAD) == 4);

	int width = GetVisibleWidth();
    m_qwpl  = GetPitch()/8; // qwords Per Line
    m_width = (width+3)/4; // 4 pixels at a time
}

void CBaseTexture::Allocate(unsigned int width, unsigned int height, unsigned int format)
{
  m_imageWidth = m_originalWidth = width;
  m_imageHeight = m_originalHeight = height;
  m_format = format;
  m_orientation = 0;

  m_textureWidth = m_imageWidth;
  m_textureHeight = m_imageHeight;

  if (m_format & XB_FMT_DXT_MASK)
    while (GetPitch() < g_Windowing.GetMinDXTPitch())
      m_textureWidth += GetBlockSize();

  if (!g_Windowing.SupportsNPOT((m_format & XB_FMT_DXT_MASK) != 0))
  {
    m_textureWidth = PadPow2(m_textureWidth);
    m_textureHeight = PadPow2(m_textureHeight);
  }
  if (m_format & XB_FMT_DXT_MASK)
  { // DXT textures must be a multiple of 4 in width and height
    m_textureWidth = ((m_textureWidth + 3) / 4) * 4;
    m_textureHeight = ((m_textureHeight + 3) / 4) * 4;
  }
  else
  {
    // align all textures so that they have an even width
    // in some circumstances when we downsize a thumbnail
    // which has an uneven number of pixels in width
    // we crash in CPicture::ScaleImage in ffmpegs swscale
    // because it tries to access beyond the source memory
    // (happens on osx and ios)
    // UPDATE: don't just update to be on an even width;
    // ffmpegs swscale relies on a 16-byte stride on some systems
    // so the textureWidth needs to be a multiple of 16. see ffmpeg
    // swscale headers for more info.
    m_textureWidth = ((m_textureWidth + 15) / 16) * 16;
  }

  // check for max texture size
  #define CLAMP(x, y) { if (x > y) x = y; }
  CLAMP(m_textureWidth, g_Windowing.GetMaxTextureSize());
  CLAMP(m_textureHeight, g_Windowing.GetMaxTextureSize());
  CLAMP(m_imageWidth, m_textureWidth);
  CLAMP(m_imageHeight, m_textureHeight);

  delete[] m_pixels;
  m_pixels = NULL;
  if (GetPitch() * GetRows() > 0)
  {
    m_pixels = new unsigned char[GetPitch() * GetRows()];
  }
}

	Matrix4* BMaxObject::GetRenderMatrix(Matrix4& mxWorld, int nRenderNumber /*= 0*/)
	{
		mxWorld.identity();

		// order of rotation: roll * pitch * yaw , where roll is applied first. 
		bool bIsIdentity = true;

		float fScaling = GetScaling();
		if (fScaling != 1.f)
		{
			Matrix4 matScale;
			ParaMatrixScaling((Matrix4*)&matScale, fScaling, fScaling, fScaling);
			mxWorld = (bIsIdentity) ? matScale : matScale.Multiply4x3(mxWorld);
			bIsIdentity = false;
		}

		float fYaw = GetYaw();
		if (fYaw != 0.f)
		{
			Matrix4 matYaw;
			ParaMatrixRotationY((Matrix4*)&matYaw, fYaw);
			mxWorld = (bIsIdentity) ? matYaw : matYaw.Multiply4x3(mxWorld);
			bIsIdentity = false;
		}

		if (GetPitch() != 0.f)
		{
			Matrix4 matPitch;
			ParaMatrixRotationX(&matPitch, GetPitch());
			mxWorld = (bIsIdentity) ? matPitch : matPitch.Multiply4x3(mxWorld);
			bIsIdentity = false;
		}

		if (GetRoll() != 0.f)
		{
			Matrix4 matRoll;
			ParaMatrixRotationZ(&matRoll, GetRoll());
			mxWorld = (bIsIdentity) ? matRoll : matRoll.Multiply4x3(mxWorld);
			bIsIdentity = false;
		}

		// world translation
		Vector3 vPos = GetRenderOffset();
		mxWorld._41 += vPos.x;
		mxWorld._42 += vPos.y;
		mxWorld._43 += vPos.z;

		return &mxWorld;
	}

bool CImageEx::SetGray()
{
	int nWidth = GetWidth();
	int nHeight = GetHeight();

	BYTE* pArray = (BYTE*)GetBits();
	int nPitch = GetPitch();
	int nBitCount = GetBPP() / 8;

	for (int i = 0; i < nHeight; i++) 
	{
		for (int j = 0; j < nWidth; j++) 
		{
			int grayVal = (BYTE)(((*(pArray + nPitch * i + j * nBitCount) * 306)
				+ (*(pArray + nPitch * i + j * nBitCount + 1) * 601)
				+ (*(pArray + nPitch * i + j * nBitCount + 2) * 117) + 512 ) >> 10);	// ¼ÆËã»Ò¶ÈÖµ

			*(pArray + nPitch * i + j * nBitCount) = grayVal;							// ¸³»Ò¶ÈÖµ
			*(pArray + nPitch * i + j * nBitCount + 1) = grayVal;
			*(pArray + nPitch * i + j * nBitCount + 2) = grayVal;
		}
	}

	return true;
}

void DrawScreenSpec()
{
int i,j,k;
unsigned char * pbPixels=E_BeginPaint();
int pitch=GetPitch();
unsigned char bt, cl, color;
pbPixels+=(44*pitch+16);
unsigned char * pbPix;
for (i=0;i<256;i++)
  {
  pbPix=pbPixels;
  for (j=0;j<48;j++)
    {
    bt=mempage0[0x9000+(j<<8)+i];
    cl=color_mem[(j<<8)+i];
    for (k=0;k<8;k++)
      {
      color=(bt&0x80)?cl:0;
      bt<<=1;
      *(pbPix+pitch)=color;
      *(pbPix+pitch+1)=color;
      *(pbPix++)=color;
      *(pbPix++)=color;
      }
    }
  pbPixels+=pitch;
  pbPixels+=pitch;
  }
E_EndPaint();
}

void dCustomHinge::SubmitConstraintsFrictionAndLimit(const dMatrix& matrix0, const dMatrix& matrix1, dFloat timestep)
{
	dFloat angle = GetPitch();
	if (angle < m_minAngle) {
		dFloat relAngle = m_minAngle - angle;
		NewtonUserJointAddAngularRow(m_joint, relAngle, &matrix1.m_front[0]);
		NewtonUserJointSetRowStiffness(m_joint, m_stiffness);
		NewtonUserJointSetRowMinimumFriction(m_joint, -m_friction);
//		m_lastRowWasUsed = true;
	} else if (angle > m_maxAngle) {
		dFloat relAngle = m_maxAngle - angle;
		NewtonUserJointAddAngularRow(m_joint, relAngle, &matrix1.m_front[0]);
		NewtonUserJointSetRowStiffness(m_joint, m_stiffness);
		NewtonUserJointSetRowMaximumFriction(m_joint, m_friction);
//		m_lastRowWasUsed = true;
	} else {
		// friction but not limits
		dFloat alpha = m_jointOmega / timestep;
		NewtonUserJointAddAngularRow(m_joint, 0, &matrix1.m_front[0]);
		NewtonUserJointSetRowAcceleration(m_joint, -alpha);
		NewtonUserJointSetRowStiffness(m_joint, m_stiffness);
		NewtonUserJointSetRowMinimumFriction(m_joint, -m_friction);
		NewtonUserJointSetRowMaximumFriction(m_joint, m_friction);
//		m_lastRowWasUsed = true;
	}
}

bool cPlayer::SaveToDisk()
{
    cFile::CreateFolder(FILE_IO_PREFIX + AString("players"));

    // create the JSON data
    Json::Value JSON_PlayerPosition;
    JSON_PlayerPosition.append(Json::Value(GetPosX()));
    JSON_PlayerPosition.append(Json::Value(GetPosY()));
    JSON_PlayerPosition.append(Json::Value(GetPosZ()));

    Json::Value JSON_PlayerRotation;
    JSON_PlayerRotation.append(Json::Value(GetRotation()));
    JSON_PlayerRotation.append(Json::Value(GetPitch()));
    JSON_PlayerRotation.append(Json::Value(GetRoll()));

    Json::Value JSON_Inventory;
    m_Inventory.SaveToJson(JSON_Inventory);

    Json::Value root;
    root["position"]       = JSON_PlayerPosition;
    root["rotation"]       = JSON_PlayerRotation;
    root["inventory"]      = JSON_Inventory;
    root["health"]         = m_Health;
    root["xpTotal"]        = m_LifetimeTotalXp;
    root["xpCurrent"]      = m_CurrentXp;
    root["air"]            = m_AirLevel;
    root["food"]           = m_FoodLevel;
    root["foodSaturation"] = m_FoodSaturationLevel;
    root["foodTickTimer"]  = m_FoodTickTimer;
    root["foodExhaustion"] = m_FoodExhaustionLevel;
    root["world"] = GetWorld()->GetName();

    if (m_GameMode == GetWorld()->GetGameMode())
    {
        root["gamemode"] = (int) eGameMode_NotSet;
    }
    else
    {
        root["gamemode"] = (int) m_GameMode;
    }

    Json::StyledWriter writer;
    std::string JsonData = writer.write(root);

    AString SourceFile;
    Printf(SourceFile, "players/%s.json", m_PlayerName.c_str() );

    cFile f;
    if (!f.Open(SourceFile, cFile::fmWrite))
    {
        LOGERROR("ERROR WRITING PLAYER \"%s\" TO FILE \"%s\" - cannot open file", m_PlayerName.c_str(), SourceFile.c_str());
        return false;
    }
    if (f.Write(JsonData.c_str(), JsonData.size()) != (int)JsonData.size())
    {
        LOGERROR("ERROR WRITING PLAYER JSON TO FILE \"%s\"", SourceFile.c_str());
        return false;
    }
    return true;
}

void cHangingEntity::SpawnOn(cClientHandle & a_ClientHandle)
{
	int Dir = 0;

	// The client uses different values for item frame directions and block faces. Our constants are for the block faces, so we convert them here to item frame faces
	switch (m_BlockFace)
	{
		case BLOCK_FACE_ZP: break;  // Initialised to zero
		case BLOCK_FACE_ZM: Dir = 2; break;
		case BLOCK_FACE_XM: Dir = 1; break;
		case BLOCK_FACE_XP: Dir = 3; break;
		default: ASSERT(!"Unhandled block face when trying to spawn item frame!"); return;
	}

	if ((Dir == 0) || (Dir == 2))  // Probably a client bug, but two directions are flipped and contrary to the norm, so we do -180
	{
		SetYaw((Dir * 90) - 180);
	}
	else
	{
		SetYaw(Dir * 90);
	}

	a_ClientHandle.SendSpawnObject(*this, 71, Dir, (Byte)GetYaw(), (Byte)GetPitch());
	a_ClientHandle.SendEntityMetadata(*this);
}

/**
 * Recreates the surface with a new size.
 * Old contents will not be altered, and may be
 * cropped to fit the new size.
 * @param width Width in pixels.
 * @param height Height in pixels.
 */
void Surface::resize(int width, int height)
{
	// Set up new surface
	Uint8 bpp = _surface->format->BitsPerPixel;
	int pitch = GetPitch(bpp, width);
	void *alignedBuffer = NewAligned(bpp, width, height);
	SDL_Surface *surface = SDL_CreateRGBSurfaceFrom(alignedBuffer, width, height, bpp, pitch, 0, 0, 0, 0);
	
	if (surface == 0)
	{
		throw Exception(SDL_GetError());
	}

	// Copy old contents
	SDL_SetColorKey(surface, SDL_SRCCOLORKEY, 0);
	SDL_SetColors(surface, getPalette(), 0, 255);
	SDL_BlitSurface(_surface, 0, surface, 0);

	// Delete old surface
	DeleteAligned(_alignedBuffer);
	SDL_FreeSurface(_surface);
	_alignedBuffer = alignedBuffer;
	_surface = surface;

	_clear.w = getWidth();
	_clear.h = getHeight();
}

	float Source::GetPitch() const
	{
	    #ifdef HAS_AUDIO_SOURCE
		return impl->GetPitch();
		#else
		throw System::PunkException(L"Audio source is not available");
		#endif
	}