/* This function takes in the file, reads the header, utilizes
* functions in compute40 module to perform the decompress, completes the
* decompressed ppm, and calls ppmwrite() to write the image to the
* stdout */
void decompress40(FILE *input)
{
unsigned height, width;
int read = fscanf(input, "COMP40 Compressed image format 2\n%u %u",
&width, &height);
assert(read == 2);
int c = getc(input);
assert(c == '\n');
A2Methods_T methods = uarray2_methods_blocked;
A2 array = methods->new_with_blocksize(width / 2, height / 2,
sizeof(uint64_t), 1);
assert(array);
A2 result = methods->new_with_blocksize(width, height,
sizeof(struct Pnm_rgb), 2);
assert(result);
methods->map_block_major(array, read_compressed, input);
methods->map_block_major(array, decompress, result);
assert(result);
struct Pnm_ppm pixmap = { .width = width, .height = height,
.denominator = DENOMINATOR, .pixels = result,
.methods = uarray2_methods_blocked};
Pnm_ppmwrite(stdout, &pixmap);
methods->free(&result);
methods->free(&array);
}
/* This function takes in the file and utilizes functions in compute40
* module to perform the compression and outputing, and frees the memory
*/
void compress40(FILE *input)
{
A2Methods_T methods = uarray2_methods_blocked;
Pnm_ppm image = Pnm_ppmread(input, methods);
assert(image);
assert(image->width > 1 && image->height > 1);
image->pixels = image_trimmer(image);
A2 result = methods->new_with_blocksize(image->width / BLOCKSIZE,
image->height / BLOCKSIZE,
sizeof(uint64_t), 1);
methods->map_block_major(result, compress, image);
assert(result);
print_result(result, methods);
methods->free(&result);
FREE(result);
Pnm_ppmfree(&image);
}
