本文整理汇总了C++中ofPixels_::getBitsPerChannel方法的典型用法代码示例。如果您正苦于以下问题：C++ ofPixels_::getBitsPerChannel方法的具体用法？C++ ofPixels_::getBitsPerChannel怎么用？C++ ofPixels_::getBitsPerChannel使用的例子？那么, 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ofPixels_的用法示例。
在下文中一共展示了ofPixels_::getBitsPerChannel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: saveImage
static bool saveImage(const ofPixels_<PixelType> & _pix, ofBuffer & buffer, ofImageFormat format, ofImageQualityType qualityLevel) {
// thanks to alvaro casinelli for the implementation
ofInitFreeImage();
if (_pix.isAllocated() == false){
ofLogError("ofImage","saveImage(): couldn't save to ofBuffer, pixels are not allocated");
return false;
}
if(format==OF_IMAGE_FORMAT_JPEG && (_pix.getNumChannels()==4 || _pix.getBitsPerChannel() > 8)){
ofPixels pix3 = _pix;
pix3.setNumChannels(3);
return saveImage(pix3,buffer,format,qualityLevel);
}
FIBITMAP * bmp = nullptr;
#ifdef TARGET_LITTLE_ENDIAN
if(sizeof(PixelType) == 1 && (_pix.getPixelFormat()==OF_PIXELS_RGB || _pix.getPixelFormat()==OF_PIXELS_RGBA)) { // Make a local copy.
ofPixels_<PixelType> pix = _pix;
pix.swapRgb();
bmp = getBmpFromPixels(pix);
}else{
#endif
bmp = getBmpFromPixels(_pix);
#ifdef TARGET_LITTLE_ENDIAN
}
#endif
if (bmp) // bitmap successfully created
{
bool returnValue;
// (b) open a memory stream to compress the image onto mem_buffer:
//
FIMEMORY *hmem = FreeImage_OpenMemory();
// (c) encode and save the image to the memory (on dib FIBITMAP image):
//
if(FREE_IMAGE_FORMAT(format) == FIF_JPEG) {
int quality = JPEG_QUALITYSUPERB;
switch(qualityLevel) {
case OF_IMAGE_QUALITY_WORST: quality = JPEG_QUALITYBAD; break;
case OF_IMAGE_QUALITY_LOW: quality = JPEG_QUALITYAVERAGE; break;
case OF_IMAGE_QUALITY_MEDIUM: quality = JPEG_QUALITYNORMAL; break;
case OF_IMAGE_QUALITY_HIGH: quality = JPEG_QUALITYGOOD; break;
case OF_IMAGE_QUALITY_BEST: quality = JPEG_QUALITYSUPERB; break;
}
returnValue = FreeImage_SaveToMemory(FIF_JPEG, bmp, hmem, quality);
}else{
returnValue = FreeImage_SaveToMemory((FREE_IMAGE_FORMAT)format, bmp, hmem);
}
/*
NOTE: at this point, hmem contains the entire data in memory stored in fif format. the
amount of space used by the memory is equal to file_size:
long file_size = FreeImage_TellMemory(hmem);
but can also be retrieved by FreeImage_AcquireMemory that retrieves both the
length of the buffer, and the buffer memory address.
*/
#ifdef TARGET_WIN32
DWORD size_in_bytes = 0;
#else
std::uint32_t size_in_bytes = 0;
#endif
// Save compressed data on mem_buffer
// note: FreeImage_AquireMemory allocates space for aux_mem_buffer):
//
unsigned char *mem_buffer = nullptr;
if (!FreeImage_AcquireMemory(hmem, &mem_buffer, &size_in_bytes)){
ofLogError("ofImage") << "saveImage(): couldn't save to ofBuffer, aquiring compressed image from memory failed";
return false;
}
/*
Now, before closing the memory stream, copy the content of mem_buffer
to an auxiliary buffer
*/
buffer.set((char*)mem_buffer,size_in_bytes);
// Finally, close the FIBITMAP object, or we will get a memory leak:
FreeImage_Unload(bmp);
// Close the memory stream (otherwise we may get a memory leak).
FreeImage_CloseMemory(hmem);
return returnValue;
}else{
return false;
}
}