本文整理汇总了C++中osg::Image::computeNumComponents方法的典型用法代码示例。如果您正苦于以下问题：C++ Image::computeNumComponents方法的具体用法？C++ Image::computeNumComponents怎么用？C++ Image::computeNumComponents使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类osg::Image的用法示例。
在下文中一共展示了Image::computeNumComponents方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: writeEXRStream
bool writeEXRStream(const osg::Image &img, std::ostream& fout, const std::string &fileName) const
{
bool writeOK = true;
//Obtain data from texture
int width = img.s();
int height = img.t();
unsigned int pixelFormat = img.getPixelFormat();
int numComponents = img.computeNumComponents(pixelFormat);
unsigned int dataType = img.getDataType();
//Validates image data
//if numbers of components matches
if (!( numComponents == 3 ||
numComponents == 4))
{
writeOK = false;
return false;
}
if (!( dataType == GL_HALF_FLOAT_ARB ||
dataType == GL_FLOAT))
{
writeOK = false;
return false;
}
//Create a stream to save to
C_OStream outStream(&fout);
//Copy data from texture to rgba pixel format
Array2D<Rgba> outPixels(height,width);
//If texture is half format
if (dataType == GL_HALF_FLOAT_ARB)
{
half* pOut = (half*) img.data();
for (long i = height-1; i >= 0; i--)
{
for (long j = 0 ; j < width; j++)
{
outPixels[i][j].r = (*pOut);
pOut++;
outPixels[i][j].g = (*pOut);
pOut++;
outPixels[i][j].b = (*pOut);
pOut++;
if (numComponents >= 4)
{
outPixels[i][j].a = (*pOut);
pOut++;
}
else {
outPixels[i][j].a = 1.0f;
}
}
}
}
else if (dataType == GL_FLOAT)
{
float* pOut = (float*) img.data();
for (long i = height-1; i >= 0; i--)
{
for (long j = 0 ; j < width; j++)
{
outPixels[i][j].r = half(*pOut);
pOut++;
outPixels[i][j].g = half(*pOut);
pOut++;
outPixels[i][j].b = half(*pOut);
pOut++;
if (numComponents >= 4)
{
outPixels[i][j].a = half(*pOut);
pOut++;
}
else
{
outPixels[i][j].a = 1.0f;
}
}
}
}
else
{
//If texture format not supported
return false;
}
try
{
//Write to stream
Header outHeader(width, height);
RgbaOutputFile rgbaFile (outStream, outHeader, WRITE_RGBA);
rgbaFile.setFrameBuffer ((&outPixels)[0][0], 1, width);
rgbaFile.writePixels (height);
}
catch( char * str )
{
writeOK = false;
}
//.........这里部分代码省略.........