int ScaleFilter_ARGB(void *inData, unsigned int inRowBytes, void *outData, unsigned int outRowBytes, unsigned int height, unsigned int width, void *kernel, unsigned int kernel_height, unsigned int kernel_width, int colorChannel, vImage_Flags flags )
{
vImage_Buffer in = { inData, height, width, inRowBytes };
vImage_Buffer out = { outData, 0, 0, outRowBytes };
TransformInfo *info = kernel;
float newHeight = height * info->yScale; //Our slider uses powers of 2
float newWidth = width * info->xScale; //Our slider uses powers of 2
out.height = newHeight;
out.width = newWidth;
return vImageScale_ARGB8888( &in, &out, NULL, flags );
}
// resize the image to the desired output size (DEFAULT = 800px[max x or y length])
void resize_image (vImage_Buffer *vImage_source, img_prop o, args flags) {
// create the output buffer for processing too
vImage_Buffer *vImage_processed = (vImage_Buffer*) malloc (sizeof (vImage_Buffer));
// Check for null
if (NULL == vImage_processed) {
printf ("Cannot malloc vImage_processed buffer\n");
exit (0);
}
// Return error value for vImage functions
vImage_Error error;
// if both the width and height have been set
if (flags->image_h != -1 && flags->image_w != -1) {
o->image_h = flags->image_h;
o->image_w = flags->image_w;
}
// If the output width has been set
if (flags->image_w != -1 && flags->image_h == -1) {
// calculate the required length or width to scale the image and apply them to the image destination attributes
if (vImage_source->width < vImage_source->height) {
o->image_w = flags->image_w;
o->image_h = calcImageLongSide (flags->image_w,
vImage_source->height,
vImage_source->width);
} else {
o->image_w = flags->image_w;
o->image_h = calcImageShortSide (flags->image_w,
vImage_source->width,
vImage_source->height);
}
}
// If the output height has been set
if (flags->image_h != -1 && flags->image_w == -1) {
// calculate the required length or width to scale the image and apply them to the image destination attributes
if (vImage_source->width < vImage_source->height) {
o->image_h = flags->image_h;
o->image_w = calcImageShortSide (flags->image_h,
vImage_source->height,
vImage_source->width);
} else {
o->image_h = flags->image_h;
o->image_w = calcImageLongSide (flags->image_h,
vImage_source->width,
vImage_source->height);
}
}
// if the max length has been set ** overides the width or height settings
if (flags->image_l != -1) {
// calculate the required length or width to scale the image and apply them to the image destination attributes
if (vImage_source->width < vImage_source->height) {
o->image_h = flags->image_l;
o->image_w = calcImageShortSide (flags->image_l,
vImage_source->height,
vImage_source->width);
} else {
o->image_w = flags->image_l;
o->image_h = calcImageShortSide (flags->image_l,
vImage_source->width,
vImage_source->height);
}
}
// setup the vimage buffers
setupBuffer (vImage_processed, o->image_h, o->image_w, o->image_w * 4);
// printf ("mallocing blank data are for the processed image buffer\n");
vImage_processed->data = malloc (vImage_processed->rowBytes * vImage_processed->height);
// Check for null
if (NULL == vImage_processed->data)
printf ("Unable to get the vimage.data pointer\n");
// Scale the image
error = vImageScale_ARGB8888 (vImage_source,
vImage_processed,
NULL,
kvImageHighQualityResampling);
if (error) {
printf ("Resize error: %d\n", (int) error);
}
// return the processed data to the sourcebuffer
reset_vImage (vImage_source, vImage_processed, o);
// free the processing buffer
free (vImage_processed);
vImage_processed = NULL;
} // resize_image