BOOL fipImage::convertTo4Bits() {
if(_dib) {
FIBITMAP *dib4 = FreeImage_ConvertTo4Bits(_dib);
return replace(dib4);
}
return FALSE;
}
/**
* Helper to encapsulate Bpp conversion using FreeImage, taking into consideration color type. Creates a new bitmap if needed. Can return the same one.
* @param pHandle FIBITMAP as defined by the Freeimage library.
* @param pNewBpp the new bpp that the supplied FIBITMAP is to be coverted to.
*/
FIBITMAP* FreeImageHelper::convertBpp(FIBITMAP* pHandle, int pNewBpp) {
//Convert the bit depth
FIBITMAP *converted = NULL;
//Convert Bpp only if needed
if (pNewBpp != static_cast<int>(FreeImage_GetBPP(pHandle))) {
//Transform bpp to the pixel format
switch (pNewBpp) {
case (4):
converted = FreeImage_ConvertTo4Bits(pHandle);
break;
case (8):
converted = FreeImage_ConvertTo8Bits(pHandle);
break;
case(16):
converted = FreeImage_ConvertTo16Bits565(pHandle); //There's option of 16Bits555. But leaves unused bits. Chosen 565 because it's most common
break;
case(24):
converted = FreeImage_ConvertTo24Bits(pHandle);
break;
case(32): {
converted = FreeImage_ConvertTo32Bits (pHandle);
}
break;
default:
converted = NULL;
break;
}
} else {
//No change, just set 'converted' handle to current one
converted = pHandle;
}
return converted;
}