/*
* Compression: void *ptr is a struct of AvgDCT to be filled with the
* calculations preformed on the AvgDCTScalled array in the closure.
*/
void applyCompToAvgDCTScaled(int col, int row, A2 toBeFilled, void* ptr,
void* cl) {
(void) toBeFilled;
struct Closure* mycl = cl;
struct AvgDCTScaled* toBeSet = ptr;
struct AvgDCT* original = mycl->methods->at(mycl->array, col, row);
toBeSet->pb = Arith40_index_of_chroma(original->pb);
toBeSet->pr = Arith40_index_of_chroma(original->pr);
toBeSet->a = (unsigned)(original->a * 511);
toBeSet->b = convertToScaledInt(original->b);
toBeSet->c = convertToScaledInt(original->c);
toBeSet->d = convertToScaledInt(original->d);
}
*/
static bitWord initialize_bitWord(UArray_T block)
{
bitWord word = malloc(sizeof(*word));
word = set_chroma_index(block, word);
word = cosine_transform(block, word);
return word;
}
static bitWord set_chroma_index(UArray_T block, bitWord word)
{
Average average = {.Pba = 0.0, .Pra = 0.0};
average = find_average(block, average);
unsigned Pba_chroma = Arith40_index_of_chroma(average.Pba);
unsigned Pra_chroma = Arith40_index_of_chroma(average.Pra);
word->Pba = Pba_chroma;
word->Pra = Pra_chroma;
return word;
}
static Average find_average(UArray_T block, Average average)
{
for (int i = 0; i < UArray_length(block); i++) {
CV temp = (CV)UArray_at(block, i);
(average.Pba) += temp->Pb;
(average.Pra) += temp->Pr;
}
/* Takes the average chroma value (Pb or Pr) and returns the quantized
* representation of the given value
*/
unsigned getIndex(float x)
{
return Arith40_index_of_chroma(x);
}
