C++ PixelBox类代码示例

// Pure 32 bit float precision brute force pixel conversion; for comparison
void naiveBulkPixelConversion(const PixelBox &src, const PixelBox &dst)
{
    uint8 *srcptr = static_cast<uint8*>(src.data);
    uint8 *dstptr = static_cast<uint8*>(dst.data);
    unsigned int srcPixelSize = PixelUtil::getNumElemBytes(src.format);
    unsigned int dstPixelSize = PixelUtil::getNumElemBytes(dst.format);

    // Calculate pitches+skips in bytes
    int srcRowSkipBytes = src.getRowSkip()*srcPixelSize;
    int srcSliceSkipBytes = src.getSliceSkip()*srcPixelSize;

    int dstRowSkipBytes = dst.getRowSkip()*dstPixelSize;
    int dstSliceSkipBytes = dst.getSliceSkip()*dstPixelSize;

	// The brute force fallback
	float r,g,b,a;
	for(size_t z=src.front; z<src.back; z++)
	{
		for(size_t y=src.top; y<src.bottom; y++)
		{
			for(size_t x=src.left; x<src.right; x++)
			{
				PixelUtil::unpackColour(&r, &g, &b, &a, src.format, srcptr);
				PixelUtil::packColour(r, g, b, a, dst.format, dstptr);
				srcptr += srcPixelSize;
				dstptr += dstPixelSize;
			}
			srcptr += srcRowSkipBytes;
			dstptr += dstRowSkipBytes;
		}
		srcptr += srcSliceSkipBytes;
		dstptr += dstSliceSkipBytes;
	}

}

	void SDLWindow::copyContentsToMemory(const PixelBox &dst, FrameBuffer buffer)
	{
		if ((dst.left < 0) || (dst.right > mWidth) ||
			(dst.top < 0) || (dst.bottom > mHeight) ||
			(dst.front != 0) || (dst.back != 1))
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
						"Invalid box.",
						"SDLWindow::copyContentsToMemory" );
		}
	
		if (buffer == FB_AUTO)
		{
			buffer = mIsFullScreen? FB_FRONT : FB_BACK;
		}
	
		GLenum format = Ogre::GLPixelUtil::getGLOriginFormat(dst.format);
		GLenum type = Ogre::GLPixelUtil::getGLOriginDataType(dst.format);
	
		if ((format == GL_NONE) || (type == 0))
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
						"Unsupported format.",
						"SDLWindow::copyContentsToMemory" );
		}
	
		// Switch context if different from current one
		RenderSystem* rsys = Root::getSingleton().getRenderSystem();
		rsys->_setViewport(this->getViewport(0));
	
		// Must change the packing to ensure no overruns!
		glPixelStorei(GL_PACK_ALIGNMENT, 1);
	
		glReadBuffer((buffer == FB_FRONT)? GL_FRONT : GL_BACK);
		glReadPixels((GLint)dst.left, (GLint)dst.top,
					 (GLsizei)dst.getWidth(), (GLsizei)dst.getHeight(),
					 format, type, dst.data);
	
		// restore default alignment
		glPixelStorei(GL_PACK_ALIGNMENT, 4);
	
		//vertical flip
		{
			size_t rowSpan = dst.getWidth() * PixelUtil::getNumElemBytes(dst.format);
			size_t height = dst.getHeight();
			uchar *tmpData = new uchar[rowSpan * height];
			uchar *srcRow = (uchar *)dst.data, *tmpRow = tmpData + (height - 1) * rowSpan;
	
			while (tmpRow >= tmpData)
			{
				memcpy(tmpRow, srcRow, rowSpan);
				srcRow += rowSpan;
				tmpRow -= rowSpan;
			}
			memcpy(dst.data, tmpData, rowSpan * height);
	
			delete [] tmpData;
		}
	}

//-------------------------------------------------------------------------------------------------//
void OSXWindow::copyContentsToMemory(const PixelBox &dst, FrameBuffer buffer)
{
	if ((dst.left < 0) || (dst.right > mWidth) ||
		(dst.top < 0) || (dst.bottom > mHeight) ||
		(dst.front != 0) || (dst.back != 1))
	{
		OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
					"Invalid box.",
					"OSXWindow::copyContentsToMemory" );
	}

	if (buffer == FB_AUTO)
	{
		buffer = mIsFullScreen? FB_FRONT : FB_BACK;
	}

	GLenum format = Ogre::GLPixelUtil::getGLOriginFormat(dst.format);
	GLenum type = Ogre::GLPixelUtil::getGLOriginDataType(dst.format);

	if ((format == GL_NONE) || (type == 0))
	{
		OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
					"Unsupported format.",
					"OSXWindow::copyContentsToMemory" );
	}

	if((dst.getWidth()*Ogre::PixelUtil::getNumElemBytes(dst.format)) & 3)
	{
		// Standard alignment of 4 is not right
		glPixelStorei(GL_PACK_ALIGNMENT, 1);
	}
	
	glReadBuffer((buffer == FB_FRONT)? GL_FRONT : GL_BACK);
	glReadPixels((GLint)dst.left, (GLint)dst.top,
				 (GLsizei)dst.getWidth(), (GLsizei)dst.getHeight(),
				 format, type, dst.data);

	glPixelStorei(GL_PACK_ALIGNMENT, 4);
	
	//vertical flip
	{
		size_t rowSpan = dst.getWidth() * PixelUtil::getNumElemBytes(dst.format);
		size_t height = dst.getHeight();
		uchar *tmpData = new uchar[rowSpan * height];
		uchar *srcRow = (uchar *)dst.data, *tmpRow = tmpData + (height - 1) * rowSpan;

		while (tmpRow >= tmpData)
		{
			memcpy(tmpRow, srcRow, rowSpan);
			srcRow += rowSpan;
			tmpRow -= rowSpan;
		}
		memcpy(dst.data, tmpData, rowSpan * height);

		delete [] tmpData;
	}
}

    void GLES2HardwarePixelBuffer::blitFromMemory(const PixelBox &src, const Image::Box &dstBox)
    {
        if (!mBuffer.contains(dstBox))
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                        "Destination box out of range",
                        "GLES2HardwarePixelBuffer::blitFromMemory");
        }

        PixelBox scaled;

        if (src.getWidth() != dstBox.getWidth() ||
            src.getHeight() != dstBox.getHeight() ||
            src.getDepth() != dstBox.getDepth())
        {
            // Scale to destination size.
            // This also does pixel format conversion if needed
            allocateBuffer();
            scaled = mBuffer.getSubVolume(dstBox);
            Image::scale(src, scaled, Image::FILTER_BILINEAR);
        }
#if OGRE_PLATFORM != OGRE_PLATFORM_APPLE_IOS
        else if ((src.format != mFormat) ||                 
                 ((GLES2PixelUtil::getGLOriginFormat(src.format) == 0) && (src.format != PF_R8G8B8)))
#else
        else if (GLES2PixelUtil::getGLOriginFormat(src.format) == 0)
#endif
        {
            // Extents match, but format is not accepted as valid source format for GL
            // do conversion in temporary buffer
            allocateBuffer();
            scaled = mBuffer.getSubVolume(dstBox);
            PixelUtil::bulkPixelConversion(src, scaled);
        }
        else
        {
            allocateBuffer();
            // No scaling or conversion needed
            scaled = src;
            if (src.format == PF_R8G8B8)
            {
                scaled.format = PF_B8G8R8;
                PixelUtil::bulkPixelConversion(src, scaled);
            }
#if OGRE_PLATFORM == OGRE_PLATFORM_NACL
            if (src.format == PF_A8R8G8B8)
            {
                scaled.format = PF_A8B8G8R8;
                PixelUtil::bulkPixelConversion(src, scaled);
            }
#endif
        }

        upload(scaled, dstBox);
        freeBuffer();
    }

// Convert Ogre pixelbox extent to D3D rectangle
RECT toD3DRECTExtent(const PixelBox &lockBox)
{
    RECT prect;
    assert(lockBox.getDepth() == 1);
    prect.left = 0;
    prect.right = static_cast<LONG>(lockBox.getWidth());
    prect.top = 0;
    prect.bottom = static_cast<LONG>(lockBox.getHeight());
    return prect;
}

// Convert Ogre pixelbox extent to D3D box
D3DBOX toD3DBOXExtent(const PixelBox &lockBox)
{
    D3DBOX pbox;
    pbox.Left = 0;
    pbox.Right = static_cast<UINT>(lockBox.getWidth());
    pbox.Top = 0;
    pbox.Bottom = static_cast<UINT>(lockBox.getHeight());
    pbox.Front = 0;
    pbox.Back = static_cast<UINT>(lockBox.getDepth());
    return pbox;
}

//-----------------------------------------------------------------------------
void D3D11HardwarePixelBuffer::blitToMemory(const Image::Box &srcBox, const PixelBox &dst)
{
    // Decide on pixel format of temp surface
    PixelFormat tmpFormat = mFormat;
    if(D3D11Mappings::_getPF(dst.format) != DXGI_FORMAT_UNKNOWN)
    {
        tmpFormat = dst.format;
    }
    assert(srcBox.getDepth() == 1 && dst.getDepth() == 1);

    //This is a pointer to the texture we're trying to copy
    //Only implemented for 2D at the moment...
    ID3D11Texture2D *textureResource = mParentTexture->GetTex2D();

    // get the description of the texture
    D3D11_TEXTURE2D_DESC desc = {0};
    textureResource->GetDesc( &desc );
    //Alter the description to set up a staging texture
    desc.Usage = D3D11_USAGE_STAGING;
    //This texture is not bound to any part of the pipeline
    desc.BindFlags = 0;
    //Allow CPU Access
    desc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
    //No Misc Flags
    desc.MiscFlags = 0;
    //Create the staging texture
    ID3D11Texture2D* pStagingTexture = NULL;
    mDevice->CreateTexture2D( &desc, NULL, &pStagingTexture );
    //Copy our texture into the staging texture
    mDevice.GetImmediateContext()->CopyResource( pStagingTexture, textureResource );
    //Create a mapped resource and map the staging texture to the resource
    D3D11_MAPPED_SUBRESOURCE mapped = {0};
    mDevice.GetImmediateContext()->Map( pStagingTexture, 0, D3D11_MAP_READ , 0, &mapped );

    // read the data out of the texture.
    unsigned int rPitch = mapped.RowPitch;
    BYTE *data = ((BYTE *)mapped.pData);

    //Using existing OGRE functions
    DXGI_MAPPED_RECT lrect;
    lrect.pBits = data;
    lrect.Pitch = rPitch;


    PixelBox locked(dst.getWidth(), dst.getHeight(), dst.getDepth(), tmpFormat);
    fromD3DLock(locked, lrect);
    PixelUtil::bulkPixelConversion(locked, dst);

    //Release the staging texture
    mDevice.GetImmediateContext()->Unmap( pStagingTexture, 0 );
    pStagingTexture->Release();
}

    void EGLWindow::copyContentsToMemory(const PixelBox &dst, FrameBuffer buffer)
    {
		if ((dst.left < 0) || (dst.right > mWidth) ||
			(dst.top < 0) || (dst.bottom > mHeight) ||
			(dst.front != 0) || (dst.back != 1))
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"Invalid box.",
				"Win32Window::copyContentsToMemory" );
		}

		if (buffer == FB_AUTO)
		{
			buffer = mIsFullScreen? FB_FRONT : FB_BACK;
		}

		GLenum format = GLESPixelUtil::getGLOriginFormat(dst.format);
		GLenum type = GLESPixelUtil::getGLOriginDataType(dst.format);

		if ((format == 0) || (type == 0))
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"Unsupported format.",
				"GtkEGLWindow::copyContentsToMemory" );
		}


		// Switch context if different from current one
		RenderSystem* rsys = Root::getSingleton().getRenderSystem();
		rsys->_setViewport(this->getViewport(0));

#if OGRE_NO_GLES3_SUPPORT == 0
        if(dst.getWidth() != dst.rowPitch)
            glPixelStorei(GL_PACK_ROW_LENGTH, dst.rowPitch);
#endif
		// Must change the packing to ensure no overruns!
		glPixelStorei(GL_PACK_ALIGNMENT, 1);

		//glReadBuffer((buffer == FB_FRONT)? GL_FRONT : GL_BACK);
        glReadPixels((GLint)0, (GLint)(mHeight - dst.getHeight()),
                     (GLsizei)dst.getWidth(), (GLsizei)dst.getHeight(),
                     format, type, dst.getTopLeftFrontPixelPtr());

		// restore default alignment
		glPixelStorei(GL_PACK_ALIGNMENT, 4);
#if OGRE_NO_GLES3_SUPPORT == 0
        glPixelStorei(GL_PACK_ROW_LENGTH, 0);
#endif
        
        PixelUtil::bulkPixelVerticalFlip(dst);
    }

void pixelBox(const PixelBox& box, isab::MapPlotter* plotter)
{
   std::vector<MC2Point> points;

   points.push_back(box.getTopLeft());
   points.push_back(box.getTopRight());
   points.push_back(box.getBottomRight());
   points.push_back(box.getBottomLeft());
   points.push_back(box.getTopLeft());

   plotter->setPenColor(255, 0, 0);
   plotter->setLineWidth(3);
   
   plotter->drawPolyLine(points.begin(), points.end());
}

	//-----------------------------------------------------------------------------  
	// Util functions to convert a D3D locked box to a pixel box
	void D3D10HardwarePixelBuffer::fromD3DLock(PixelBox &rval, const DXGI_MAPPED_RECT &lrect)
	{
		rval.rowPitch = lrect.Pitch / PixelUtil::getNumElemBytes(rval.format);
		rval.slicePitch = rval.rowPitch * rval.getHeight();
		assert((lrect.Pitch % PixelUtil::getNumElemBytes(rval.format))==0);
		rval.data = lrect.pBits;
	}

///  _Tool_ tex ..........................
//  (remove alpha channel for ter tex prv img)
void App::ToolTexAlpha()
{
	Ogre::Image im;
	im.load("jungle_5d.png", "General");

	PixelBox pb = im.getPixelBox();
	int w = pb.getWidth(), h = pb.getHeight();
	for(int j=0; j < h; ++j)
	for(int i=0; i < w; ++i)
	{
		ColourValue c = pb.getColourAt(i,j,0);
		c.a = 1.f;
		pb.setColourAt(c,i,j,0);
	}
	im.save(PATHMANAGER::Data()+"/prv.png");
}

    void EGLWindow::copyContentsToMemory(const Box& src, const PixelBox &dst, FrameBuffer buffer)
    {
        if(src.right > mWidth || src.bottom > mHeight || src.front != 0 || src.back != 1
        || dst.getWidth() != src.getWidth() || dst.getHeight() != src.getHeight() || dst.getDepth() != 1)
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Invalid box.", "EGLWindow::copyContentsToMemory");
        }

        if (buffer == FB_AUTO)
        {
            buffer = mIsFullScreen? FB_FRONT : FB_BACK;
        }

        static_cast<GLRenderSystemCommon*>(Root::getSingleton().getRenderSystem())
                ->_copyContentsToMemory(getViewport(0), src, dst, buffer);
    }

void ShVarItem::setCurrentValue(int key0, int key1)
{
	if (key0 >= 0 && key1 >= 0 && data(DF_WATCHED).toBool()) {
		if (data(DF_DATA_PIXELBOX).value<void*>() != NULL) {
			PixelBox *fb = getPixelBoxPointer();
			if (fb) {
				QVariant value;
				bool validValue = fb->getDataValue(key0, key1, &value);
				if (validValue) {
					setData(DF_DEBUG_SELECTED_VALUE, value.toString());
					return;
				}
			}
		}
		setData(DF_DEBUG_SELECTED_VALUE, "?");
		return;
	}
	setData(DF_DEBUG_SELECTED_VALUE, QVariant());
}

    //-----------------------------------------------------------------------
    void ILUtil::toOgre(const PixelBox &dst) 
    {
		if(!dst.isConsecutive())
			OGRE_EXCEPT( Exception::ERR_NOT_IMPLEMENTED,
                "Destination must currently be consecutive",
                "ILUtil::ilToOgre" ) ;
		if(dst.getWidth() != static_cast<size_t>(ilGetInteger( IL_IMAGE_WIDTH )) ||
        	dst.getHeight() != static_cast<size_t>(ilGetInteger( IL_IMAGE_HEIGHT )) ||
        	dst.getDepth() != static_cast<size_t>(ilGetInteger( IL_IMAGE_DEPTH )))
			OGRE_EXCEPT( Exception::ERR_INVALIDPARAMS,
                "Destination dimensions must equal IL dimension",
                "ILUtil::ilToOgre" ) ;
        
        int ilfmt = ilGetInteger( IL_IMAGE_FORMAT );
        int iltp = ilGetInteger( IL_IMAGE_TYPE );

		// Check if in-memory format just matches
		// If yes, we can just copy it and save conversion
		ILFormat ifmt = OgreFormat2ilFormat( dst.format );
		if(ifmt.format == ilfmt && ILabs(ifmt.type) == ILabs(iltp)) {
            memcpy(dst.data, ilGetData(), ilGetInteger( IL_IMAGE_SIZE_OF_DATA )); 
            return;
        }
		// Try if buffer is in a known OGRE format so we can use OGRE its
		// conversion routines
		PixelFormat bufFmt = ilFormat2OgreFormat((int)ilfmt, (int)iltp);
		
		ifmt = OgreFormat2ilFormat( bufFmt );
		if(ifmt.format == ilfmt && ILabs(ifmt.type) == ILabs(iltp))
		{
			// IL format matches another OGRE format
			PixelBox src(dst.getWidth(), dst.getHeight(), dst.getDepth(), bufFmt, ilGetData());
			PixelUtil::bulkPixelConversion(src, dst);
			return;
		}
		
        // Thee extremely slow method
        if(iltp == IL_UNSIGNED_BYTE || iltp == IL_BYTE) 
        {
            ilToOgreInternal(static_cast<uint8*>(dst.data), dst.format, (uint8)0x00,(uint8)0x00,(uint8)0x00,(uint8)0xFF);
        } 
        else if(iltp == IL_FLOAT)
        {
            ilToOgreInternal(static_cast<uint8*>(dst.data), dst.format, 0.0f,0.0f,0.0f,1.0f);          
        }
		else if(iltp == IL_SHORT || iltp == IL_UNSIGNED_SHORT)
        {
			ilToOgreInternal(static_cast<uint8*>(dst.data), dst.format, 
				(uint16)0x0000,(uint16)0x0000,(uint16)0x0000,(uint16)0xFFFF); 
        }
        else 
        {
            OGRE_EXCEPT( Exception::ERR_NOT_IMPLEMENTED,
                "Cannot convert this DevIL type",
                "ILUtil::ilToOgre" ) ;
        }
    }

void TextureViewGL::ReadPixels(RenderContext_Base_GL* gl, TextureBase::ReadPixelUpdateParams& params) {
	if (params.lock.test_and_set(std::memory_order_release))
		return;
	PixelBox* pixels = params.box;
	gl->ActivateTexture(target, texture);
	Size dim = gl->GetTextureParams(target);

	pixels->data = static_cast<uint8*>(
		NEX_ALLOC(dim.dx * dim.dy * pixelFormat.pixelSize, MEMCAT_GENERAL));
	pixels->left = 0;
	pixels->right = dim.dx;
	pixels->top = 0;
	pixels->bottom = dim.dy;
	pixels->front = 0;
	pixels->back = 1;
	pixels->format = pixelFormat.textureFormat;
	pixels->deleteData = true;
	gl->GetTextureData(target, pixelFormat.internalFormat, pixelFormat.dataType, pixels->data);
	pixels->CalculatePitches();
}