void Image_flipX(Image *self)
{
size_t y;
size_t w = self->width;
size_t h = self->height;
int componentCount = self->componentCount;
uint8_t *bytes = UArray_mutableBytes(self->byteArray);
uint8_t buf[4];
for (y = 0; y < h; y ++)
{
size_t x;
for (x = 0; x < w/2; x ++)
{
uint8_t *a = bytes + componentCount * (y * w) + x * componentCount;
uint8_t *b = bytes + componentCount * (y * w) + (w - x) * componentCount;
memcpy(buf, a, componentCount);
memcpy(a, b, componentCount);
memcpy(b, buf, componentCount);
}
}
}
IOIMAGE_API IoObject *IoImage_filterKirsch(IoImage *self, IoObject *locals, IoMessage *m)
{
/*doc Image filterKirsch(a)
Returns new image as a result of applying Kirsch filter.
The argument denotes direction: 0, 1, 2, ... -> 0, pi / 4, pi / 2, ...
*/
int a = IoMessage_locals_intArgAt_(m, locals, 0);
a = ((a % 8) + 8) % 8;
static int mapOfPixels[8] = {0, 1, 2, 5, 8, 7, 6, 3};
static int contentsOfPixels[8] = {3, 3, 3, 3, -5, -5, -5, 3};
UArray* filter = UArray_new();
UArray_setItemType_(filter, CTYPE_int8_t);
UArray_setEncoding_(filter, CENCODING_NUMBER);
UArray_setSize_(filter, 9);
int8_t *filterBytes = UArray_mutableBytes(filter);
int i;
for(i = 0; i < 8; i++)
{
filterBytes[(i + a) % 8] = contentsOfPixels[i];
}
IoImage* toReturn = IoImage_newWithImage_(IOSTATE, Image_applyLinearFilter(DATA(self)->image, 3, 3, filter));
UArray_free(filter);
return toReturn;
}
