/*
 * CINELERRA
 * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 */

#include "clip.h"
//#include "../downsample/downsampleengine.h"
//#include "motion.h"
#include "motionscan.h"
#include "mutex.h"
#include "vframe.h"

#include <math.h>

// The module which does the actual scanning

MotionScanPackage::MotionScanPackage()
 : LoadPackage()
{
	valid = 1;
}






MotionScanUnit::MotionScanUnit(MotionScan *server)
 : LoadClient(server)
{
	this->server = server;
	cache_lock = new Mutex("MotionScanUnit::cache_lock");
}

MotionScanUnit::~MotionScanUnit()
{
	delete cache_lock;
}



void MotionScanUnit::process_package(LoadPackage *package)
{
	MotionScanPackage *pkg = (MotionScanPackage*)package;
	int w = server->current_frame->get_w();
	int h = server->current_frame->get_h();
	int color_model = server->current_frame->get_color_model();
	int pixel_size = BC_CModels::calculate_pixelsize(color_model);
	int row_bytes = server->current_frame->get_bytes_per_line();












// Single pixel
	if(!server->subpixel)
	{
// Try cache
		pkg->difference1 = server->get_cache(pkg->search_x, pkg->search_y);
		if(pkg->difference1 < 0)
		{
//printf("MotionScanUnit::process_package 1 search_x=%d search_y=%d scan_x1=%d scan_y1=%d scan_x2=%d scan_y2=%d x_steps=%d y_steps=%d\n", 
//pkg->search_x, pkg->search_y, pkg->scan_x1, pkg->scan_y1, pkg->scan_x2, pkg->scan_y2, server->x_steps, server->y_steps);
// Pointers to first pixel in each block
			unsigned char *prev_ptr = server->previous_frame->get_rows()[
				pkg->search_y] +	
				pkg->search_x * pixel_size;
			unsigned char *current_ptr = server->current_frame->get_rows()[
				pkg->block_y1] +
				pkg->block_x1 * pixel_size;

// Scan block
			pkg->difference1 = MotionScan::abs_diff(prev_ptr,
				current_ptr,
				row_bytes,
				pkg->block_x2 - pkg->block_x1,
				pkg->block_y2 - pkg->block_y1,
				color_model);

// printf("MotionScanUnit::process_package %d search_x=%d search_y=%d diff=%lld\n",
// __LINE__, server->block_x1 - pkg->search_x, server->block_y1 - pkg->search_y, pkg->difference1);
			server->put_cache(pkg->search_x, pkg->search_y, pkg->difference1);
		}
	}







	else








// Sub pixel
	{
		unsigned char *prev_ptr = server->previous_frame->get_rows()[
			pkg->search_y] +
			pkg->search_x * pixel_size;
		unsigned char *current_ptr = server->current_frame->get_rows()[
			pkg->block_y1] +
			pkg->block_x1 * pixel_size;

// With subpixel, there are two ways to compare each position, one by shifting
// the previous frame and two by shifting the current frame.
		pkg->difference1 = MotionScan::abs_diff_sub(prev_ptr,
			current_ptr,
			row_bytes,
			pkg->block_x2 - pkg->block_x1,
			pkg->block_y2 - pkg->block_y1,
			color_model,
			pkg->sub_x,
			pkg->sub_y);
		pkg->difference2 = MotionScan::abs_diff_sub(current_ptr,
			prev_ptr,
			row_bytes,
			pkg->block_x2 - pkg->block_x1,
			pkg->block_y2 - pkg->block_y1,
			color_model,
			pkg->sub_x,
			pkg->sub_y);
// printf("MotionScanUnit::process_package sub_x=%d sub_y=%d search_x=%d search_y=%d diff1=%lld diff2=%lld\n",
// sub_x,
// sub_y,
// search_x,
// search_y,
// pkg->difference1,
// pkg->difference2);
	}




}










int64_t MotionScanUnit::get_cache(int x, int y)
{
	int64_t result = -1;
	cache_lock->lock("MotionScanUnit::get_cache");
	for(int i = 0; i < cache.total; i++)
	{
		MotionScanCache *ptr = cache.values[i];
		if(ptr->x == x && ptr->y == y)
		{
			result = ptr->difference;
			break;
		}
	}
	cache_lock->unlock();
	return result;
}

void MotionScanUnit::put_cache(int x, int y, int64_t difference)
{
	MotionScanCache *ptr = new MotionScanCache(x, y, difference);
	cache_lock->lock("MotionScanUnit::put_cache");
	cache.append(ptr);
	cache_lock->unlock();
}











MotionScan::MotionScan(int total_clients,
	int total_packages)
 : LoadServer(
//1, 1 
total_clients, total_packages 
)
{
	test_match = 1;
	cache_lock = new Mutex("MotionScan::cache_lock");
	downsampled_previous = 0;
	downsampled_current = 0;
//	downsample = 0;
}

MotionScan::~MotionScan()
{
	delete cache_lock;
	delete downsampled_previous;
	delete downsampled_current;
//	delete downsample;
}


void MotionScan::init_packages()
{
// Set package coords
//printf("MotionScan::init_packages %d %d\n", __LINE__, get_total_packages());
	for(int i = 0; i < get_total_packages(); i++)
	{
		MotionScanPackage *pkg = (MotionScanPackage*)get_package(i);

		pkg->block_x1 = block_x1;
		pkg->block_x2 = block_x2;
		pkg->block_y1 = block_y1;
		pkg->block_y2 = block_y2;
		pkg->scan_x1 = scan_x1;
		pkg->scan_x2 = scan_x2;
		pkg->scan_y1 = scan_y1;
		pkg->scan_y2 = scan_y2;
		pkg->step = i;
		pkg->difference1 = 0;
		pkg->difference2 = 0;
		pkg->dx = 0;
		pkg->dy = 0;
		pkg->valid = 1;
		
		if(!subpixel)
		{
			pkg->search_x = pkg->scan_x1 + (pkg->step % x_steps) *
				(scan_x2 - scan_x1) / x_steps;
			pkg->search_y = pkg->scan_y1 + (pkg->step / x_steps) *
				(scan_y2 - scan_y1) / y_steps;
			pkg->sub_x = 0;
			pkg->sub_y = 0;
		}
		else
		{
			pkg->sub_x = pkg->step % (OVERSAMPLE * 2);
			pkg->sub_y = pkg->step / (OVERSAMPLE * 2);

			if(horizontal_only)
			{
				pkg->sub_y = 0;
			}

			if(vertical_only)
			{
				pkg->sub_x = 0;
			}

			pkg->search_x = pkg->scan_x1 + pkg->sub_x / OVERSAMPLE + 1;
			pkg->search_y = pkg->scan_y1 + pkg->sub_y / OVERSAMPLE + 1;
			pkg->sub_x %= OVERSAMPLE;
			pkg->sub_y %= OVERSAMPLE;



// printf("MotionScan::init_packages %d i=%d search_x=%d search_y=%d sub_x=%d sub_y=%d\n", 
// __LINE__,
// i,
// pkg->search_x,
// pkg->search_y,
// pkg->sub_x,
// pkg->sub_y);
		}

// printf("MotionScan::init_packages %d %d,%d %d,%d %d,%d\n",
// __LINE__,
// scan_x1,
// scan_x2,
// scan_y1,
// scan_y2,
// pkg->search_x,
// pkg->search_y);
	}
}

LoadClient* MotionScan::new_client()
{
	return new MotionScanUnit(this);
}

LoadPackage* MotionScan::new_package()
{
	return new MotionScanPackage;
}


void MotionScan::set_test_match(int value)
{
	this->test_match = value;
}

void MotionScan::scan_frame(VFrame *previous_frame,
	VFrame *current_frame,
	int global_range_w,
	int global_range_h,
	int global_block_w,
	int global_block_h,
	double block_x,
	double block_y,
	int frame_type,
	int tracking_type,
	int action_type,
	int horizontal_only,
	int vertical_only,
	int source_position,
	int total_steps,
	int total_dx,
	int total_dy,
	int global_origin_x,
	int global_origin_y)
{
	this->previous_frame_arg = previous_frame;
	this->current_frame_arg = current_frame;
	this->horizontal_only = horizontal_only;
	this->vertical_only = vertical_only;
	this->previous_frame = previous_frame_arg;
	this->current_frame = current_frame_arg;
	this->global_origin_x = global_origin_x;
	this->global_origin_y = global_origin_y;
	subpixel = 0;

	cache.remove_all_objects();

// Single macroblock
	int w = current_frame->get_w();
	int h = current_frame->get_h();

// Initial search parameters
	int scan_w = w * global_range_w / 100;
	int scan_h = h * global_range_h / 100;
	int block_w = w * global_block_w / 100;
	int block_h = h * global_block_h / 100;

// Location of block in previous frame
	block_x1 = (int)(w * block_x / 100 - block_w / 2);
	block_y1 = (int)(h * block_y / 100 - block_h / 2);
	block_x2 = (int)(w * block_x / 100 + block_w / 2);
	block_y2 = (int)(h * block_y / 100 + block_h / 2);

// Offset to location of previous block.  This offset needn't be very accurate
// since it's the offset of the previous image and current image we want.
	if(frame_type == MotionScan::TRACK_PREVIOUS)
	{
		block_x1 += total_dx / OVERSAMPLE;
		block_y1 += total_dy / OVERSAMPLE;
		block_x2 += total_dx / OVERSAMPLE;
		block_y2 += total_dy / OVERSAMPLE;
	}

	skip = 0;

	switch(tracking_type)
	{
// Don't calculate
		case MotionScan::NO_CALCULATE:
			dx_result = 0;
			dy_result = 0;
			skip = 1;
			break;

		case MotionScan::LOAD:
		{
//printf("MotionScan::scan_frame %d\n", __LINE__);
// Load result from disk
			char string[BCTEXTLEN];
			sprintf(string, "%s%06d", 
				MOTION_FILE, 
				source_position);
			FILE *input = fopen(string, "r");
			if(input)
			{
				fscanf(input, 
					"%d %d", 
					&dx_result,
					&dy_result);
				fclose(input);
				skip = 1;
			}
			break;
		}

// Scan from scratch
		default:
			skip = 0;
			break;
	}

	if(!skip && test_match)
	{
		if(previous_frame->data_matches(current_frame))
		{
printf("MotionScan::scan_frame: data matches. skipping.\n");
			dx_result = 0;
			dy_result = 0;
			skip = 1;
		}
	}

// Perform scan
	if(!skip)
	{
//printf("MotionScan::scan_frame %d\n", __LINE__);
// Location of block in current frame
		int origin_offset_x = this->global_origin_x * w / 100;
		int origin_offset_y = this->global_origin_y * h / 100;
		int x_result = block_x1 + origin_offset_x;
		int y_result = block_y1 + origin_offset_y;

// printf("MotionScan::scan_frame 1 %d %d %d %d %d %d %d %d\n",
// block_x1 + block_w / 2,
// block_y1 + block_h / 2,
// block_w,
// block_h,
// block_x1,
// block_y1,
// block_x2,
// block_y2);

		while(1)
		{
// Cache needs to be cleared if downsampling is used because the sums of 
// different downsamplings can't be compared.
// Subpixel never uses the cache.
//			cache.remove_all_objects();
			scan_x1 = x_result - scan_w / 2;
			scan_y1 = y_result - scan_h / 2;
			scan_x2 = x_result + scan_w / 2;
			scan_y2 = y_result + scan_h / 2;



// Zero out requested values
			if(horizontal_only)
			{
				scan_y1 = block_y1;
				scan_y2 = block_y1 + 1;
			}
			if(vertical_only)
			{
				scan_x1 = block_x1;
				scan_x2 = block_x1 + 1;
			}

// printf("MotionScan::scan_frame 1 %d %d %d %d %d %d %d %d\n",
// block_x1,
// block_y1,
// block_x2,
// block_y2,
// scan_x1,
// scan_y1,
// scan_x2,
// scan_y2);
// Clamp the block coords before the scan so we get useful scan coords.
			clamp_scan(w, 
				h, 
				&block_x1,
				&block_y1,
				&block_x2,
				&block_y2,
				&scan_x1,
				&scan_y1,
				&scan_x2,
				&scan_y2,
				0);
// printf("MotionScan::scan_frame 1 %d block_x1=%d block_y1=%d block_x2=%d block_y2=%d\n	 scan_x1=%d scan_y1=%d scan_x2=%d scan_y2=%d\n    x_result=%d y_result=%d\n", 
// __LINE__,
// block_x1,
// block_y1,
// block_x2,
// block_y2,
// scan_x1, 
// scan_y1, 
// scan_x2, 
// scan_y2, 
// x_result, 
// y_result);


// Give up if invalid coords.
			if(scan_y2 <= scan_y1 ||
				scan_x2 <= scan_x1 ||
				block_x2 <= block_x1 ||
				block_y2 <= block_y1)
				break;

// For subpixel, the top row and left column are skipped
			if(subpixel)
			{

//printf("MotionScan::scan_frame %d %d %d\n", __LINE__, x_result, y_result);
// Scan every subpixel in a 2 pixel * 2 pixel square
				total_pixels = (2 * OVERSAMPLE) * (2 * OVERSAMPLE);

				this->total_steps = total_pixels;
// These aren't used in subpixel
				this->x_steps = OVERSAMPLE * 2;
				this->y_steps = OVERSAMPLE * 2;

				set_package_count(this->total_steps);
				process_packages();

// Get least difference
				int64_t min_difference = -1;
				for(int i = 0; i < get_total_packages(); i++)
				{
					MotionScanPackage *pkg = (MotionScanPackage*)get_package(i);
//printf("MotionScan::scan_frame %d search_x=%d search_y=%d sub_x=%d sub_y=%d diff1=%lld diff2=%lld\n", 
//__LINE__, pkg->search_x, pkg->search_y, pkg->sub_x, pkg->sub_y, pkg->difference1, pkg->difference2);
					if(pkg->difference1 < min_difference || min_difference == -1)
					{
						min_difference = pkg->difference1;

// The sub coords are 1 pixel up & left of the block coords
						x_result = pkg->search_x * OVERSAMPLE + pkg->sub_x;
						y_result = pkg->search_y * OVERSAMPLE + pkg->sub_y;


// Fill in results
						dx_result = block_x1 * OVERSAMPLE - x_result;
						dy_result = block_y1 * OVERSAMPLE - y_result;
//printf("MotionScan::scan_frame %d dx_result=%d dy_result=%d diff=%lld\n", 
//__LINE__, dx_result, dy_result, min_difference);
					}

					if(pkg->difference2 < min_difference)
					{
						min_difference = pkg->difference2;

						x_result = pkg->search_x * OVERSAMPLE - pkg->sub_x;
						y_result = pkg->search_y * OVERSAMPLE - pkg->sub_y;

						dx_result = block_x1 * OVERSAMPLE - x_result;
						dy_result = block_y1 * OVERSAMPLE - y_result;
//printf("MotionScan::scan_frame %d dx_result=%d dy_result=%d diff=%lld\n", 
//__LINE__, dx_result, dy_result, min_difference);
					}
				}

				break;
			}
			else
// Single pixel
			{
				total_pixels = (scan_x2 - scan_x1) * (scan_y2 - scan_y1);
				this->total_steps = MIN(total_steps, total_pixels);

				if(this->total_steps == total_pixels)
				{
					x_steps = scan_x2 - scan_x1;
					y_steps = scan_y2 - scan_y1;
				}
				else
				{
					x_steps = (int)sqrt(this->total_steps);
					y_steps = (int)sqrt(this->total_steps);
				}

// Use downsampled images
// 				if(scan_x2 - scan_x1 > x_steps * 4 ||
// 					scan_y2 - scan_y1 > y_steps * 4)
// 				{
// printf("MotionScan::scan_frame %d total_pixels=%d total_steps=%d x_steps=%d y_steps=%d x y steps=%d\n",
// __LINE__,
// total_pixels,
// total_steps,
// x_steps,
// y_steps,
// x_steps * y_steps);
// 
// 					if(!downsampled_previous ||
// 						!downsampled_previous->equivalent(previous_frame_arg))
// 					{
// 						delete downsampled_previous;
// 						downsampled_previous = new VFrame(*previous_frame_arg);
// 					}
// 
// 					if(!downsampled_current ||
// 						!downsampled_current->equivalent(current_frame_arg))
// 					{
// 						delete downsampled_current;
// 						downsampled_current = new VFrame(*current_frame_arg);
// 					}
// 
// 
// 					if(!downsample)
// 						downsample = new DownSampleServer(get_total_clients(), 
// 							get_total_clients());
// 					downsample->process_frame(downsampled_previous, 
// 						previous_frame_arg, 
// 						1, 
// 						1, 
// 						1, 
// 						1,
// 						(scan_y2 - scan_y1) / y_steps,
// 						(scan_x2 - scan_x1) / x_steps,
// 						0,
// 						0);
// 					downsample->process_frame(downsampled_current, 
// 						current_frame_arg, 
// 						1, 
// 						1, 
// 						1, 
// 						1,
// 						(scan_y2 - scan_y1) / y_steps,
// 						(scan_x2 - scan_x1) / x_steps,
// 						0,
// 						0);
// 					this->previous_frame = downsampled_previous;
// 					this->current_frame = downsampled_current;
// 				}





// printf("MotionScan::scan_frame %d this->total_steps=%d\n", 
// __LINE__, 
// this->total_steps);


				set_package_count(this->total_steps);
				process_packages();

// Get least difference
				int64_t min_difference = -1;
				for(int i = 0; i < get_total_packages(); i++)
				{
					MotionScanPackage *pkg = (MotionScanPackage*)get_package(i);
//printf("MotionScan::scan_frame %d search_x=%d search_y=%d sub_x=%d sub_y=%d diff1=%lld diff2=%lld\n", 
//__LINE__, pkg->search_x, pkg->search_y, pkg->sub_x, pkg->sub_y, pkg->difference1, pkg->difference2);
					if(pkg->difference1 < min_difference || min_difference == -1)
					{
						min_difference = pkg->difference1;
						x_result = pkg->search_x;
						y_result = pkg->search_y;
						x_result *= OVERSAMPLE;
						y_result *= OVERSAMPLE;
//printf("MotionScan::scan_frame %d x_result=%d y_result=%d diff=%lld\n", 
//__LINE__, block_x1 * OVERSAMPLE - x_result, block_y1 * OVERSAMPLE - y_result, pkg->difference1);
					}
				}


// If a new search is required, rescale results back to pixels.
				if(this->total_steps >= total_pixels)
				{
// Single pixel accuracy reached.  Now do exhaustive subpixel search.
					if(action_type == MotionScan::STABILIZE ||
						action_type == MotionScan::TRACK ||
						action_type == MotionScan::NOTHING)
					{
//printf("MotionScan::scan_frame %d %d %d\n", __LINE__, x_result, y_result);
						x_result /= OVERSAMPLE;
						y_result /= OVERSAMPLE;
						scan_w = 2;
						scan_h = 2;
						subpixel = 1;
					}
					else
					{
// Fill in results and quit
						dx_result = block_x1 * OVERSAMPLE - x_result;
						dy_result = block_y1 * OVERSAMPLE - y_result;
//printf("MotionScan::scan_frame %d %d %d\n", __LINE__, dx_result, dy_result);
						break;
					}
				}
				else
// Reduce scan area and try again
				{
					scan_w = (scan_x2 - scan_x1) / 2;
					scan_h = (scan_y2 - scan_y1) / 2;
					x_result /= OVERSAMPLE;
					y_result /= OVERSAMPLE;
				}
			}
		}

		dx_result *= -1;
		dy_result *= -1;
	}
//printf("MotionScan::scan_frame %d\n", __LINE__);


	if(vertical_only) dx_result = 0;
	if(horizontal_only) dy_result = 0;



// Write results
	if(tracking_type == MotionScan::SAVE)
	{
		char string[BCTEXTLEN];
		sprintf(string, 
			"%s%06d", 
			MOTION_FILE, 
			source_position);
		FILE *output = fopen(string, "w");
		if(output)
		{
			fprintf(output, 
				"%d %d\n",
				dx_result,
				dy_result);
			fclose(output);
		}
		else
		{
			printf("MotionScan::scan_frame %d: save coordinate failed", __LINE__);
		}
	}

// printf("MotionScan::scan_frame %d dx=%.2f dy=%.2f\n", 
// __LINE__,
// (float)this->dx_result / OVERSAMPLE,
// (float)this->dy_result / OVERSAMPLE);
}

















int64_t MotionScan::get_cache(int x, int y)
{
	int64_t result = -1;
	cache_lock->lock("MotionScan::get_cache");
	for(int i = 0; i < cache.total; i++)
	{
		MotionScanCache *ptr = cache.values[i];
		if(ptr->x == x && ptr->y == y)
		{
			result = ptr->difference;
			break;
		}
	}
	cache_lock->unlock();
	return result;
}

void MotionScan::put_cache(int x, int y, int64_t difference)
{
	MotionScanCache *ptr = new MotionScanCache(x, y, difference);
	cache_lock->lock("MotionScan::put_cache");
	cache.append(ptr);
	cache_lock->unlock();
}



#define ABS_DIFF(type, temp_type, multiplier, components) \
{ \
	temp_type result_temp = 0; \
	for(int i = 0; i < h; i++) \
	{ \
		type *prev_row = (type*)prev_ptr; \
		type *current_row = (type*)current_ptr; \
		for(int j = 0; j < w; j++) \
		{ \
			for(int k = 0; k < 3; k++) \
			{ \
				temp_type difference; \
				difference = *prev_row++ - *current_row++; \
				if(difference < 0) \
					result_temp -= difference; \
				else \
					result_temp += difference; \
			} \
			if(components == 4) \
			{ \
				prev_row++; \
				current_row++; \
			} \
		} \
		prev_ptr += row_bytes; \
		current_ptr += row_bytes; \
	} \
	result = (int64_t)(result_temp * multiplier); \
}

int64_t MotionScan::abs_diff(unsigned char *prev_ptr,
	unsigned char *current_ptr,
	int row_bytes,
	int w,
	int h,
	int color_model)
{
	int64_t result = 0;
	switch(color_model)
	{
		case BC_RGB888:
			ABS_DIFF(unsigned char, int64_t, 1, 3)
			break;
		case BC_RGBA8888:
			ABS_DIFF(unsigned char, int64_t, 1, 4)
			break;
		case BC_RGB_FLOAT:
			ABS_DIFF(float, double, 0x10000, 3)
			break;
		case BC_RGBA_FLOAT:
			ABS_DIFF(float, double, 0x10000, 4)
			break;
		case BC_YUV888:
			ABS_DIFF(unsigned char, int64_t, 1, 3)
			break;
		case BC_YUVA8888:
			ABS_DIFF(unsigned char, int64_t, 1, 4)
			break;
		case BC_YUV161616:
			ABS_DIFF(uint16_t, int64_t, 1, 3)
			break;
		case BC_YUVA16161616:
			ABS_DIFF(uint16_t, int64_t, 1, 4)
			break;
	}
	return result;
}



#define ABS_DIFF_SUB(type, temp_type, multiplier, components) \
{ \
	temp_type result_temp = 0; \
	temp_type y2_fraction = sub_y * 0x100 / OVERSAMPLE; \
	temp_type y1_fraction = 0x100 - y2_fraction; \
	temp_type x2_fraction = sub_x * 0x100 / OVERSAMPLE; \
	temp_type x1_fraction = 0x100 - x2_fraction; \
	for(int i = 0; i < h_sub; i++) \
	{ \
		type *prev_row1 = (type*)prev_ptr; \
		type *prev_row2 = (type*)prev_ptr + components; \
		type *prev_row3 = (type*)(prev_ptr + row_bytes); \
		type *prev_row4 = (type*)(prev_ptr + row_bytes) + components; \
		type *current_row = (type*)current_ptr; \
		for(int j = 0; j < w_sub; j++) \
		{ \
/* Scan each component */ \
			for(int k = 0; k < 3; k++) \
			{ \
				temp_type difference; \
				temp_type prev_value = \
					(*prev_row1++ * x1_fraction * y1_fraction + \
					*prev_row2++ * x2_fraction * y1_fraction + \
					*prev_row3++ * x1_fraction * y2_fraction + \
					*prev_row4++ * x2_fraction * y2_fraction) / \
					0x100 / 0x100; \
				temp_type current_value = *current_row++; \
				difference = prev_value - current_value; \
				if(difference < 0) \
					result_temp -= difference; \
				else \
					result_temp += difference; \
			} \
 \
/* skip alpha */ \
			if(components == 4) \
			{ \
				prev_row1++; \
				prev_row2++; \
				prev_row3++; \
				prev_row4++; \
				current_row++; \
			} \
		} \
		prev_ptr += row_bytes; \
		current_ptr += row_bytes; \
	} \
	result = (int64_t)(result_temp * multiplier); \
}




int64_t MotionScan::abs_diff_sub(unsigned char *prev_ptr,
	unsigned char *current_ptr,
	int row_bytes,
	int w,
	int h,
	int color_model,
	int sub_x,
	int sub_y)
{
	int h_sub = h - 1;
	int w_sub = w - 1;
	int64_t result = 0;

	switch(color_model)
	{
		case BC_RGB888:
			ABS_DIFF_SUB(unsigned char, int64_t, 1, 3)
			break;
		case BC_RGBA8888:
			ABS_DIFF_SUB(unsigned char, int64_t, 1, 4)
			break;
		case BC_RGB_FLOAT:
			ABS_DIFF_SUB(float, double, 0x10000, 3)
			break;
		case BC_RGBA_FLOAT:
			ABS_DIFF_SUB(float, double, 0x10000, 4)
			break;
		case BC_YUV888:
			ABS_DIFF_SUB(unsigned char, int64_t, 1, 3)
			break;
		case BC_YUVA8888:
			ABS_DIFF_SUB(unsigned char, int64_t, 1, 4)
			break;
		case BC_YUV161616:
			ABS_DIFF_SUB(uint16_t, int64_t, 1, 3)
			break;
		case BC_YUVA16161616:
			ABS_DIFF_SUB(uint16_t, int64_t, 1, 4)
			break;
	}
	return result;
}





MotionScanCache::MotionScanCache(int x, int y, int64_t difference)
{
	this->x = x;
	this->y = y;
	this->difference = difference;
}



void MotionScan::clamp_scan(int w, 
	int h, 
	int *block_x1,
	int *block_y1,
	int *block_x2,
	int *block_y2,
	int *scan_x1,
	int *scan_y1,
	int *scan_x2,
	int *scan_y2,
	int use_absolute)
{
// printf("MotionMain::clamp_scan 1 w=%d h=%d block=%d %d %d %d scan=%d %d %d %d absolute=%d\n",
// w,
// h,
// *block_x1,
// *block_y1,
// *block_x2,
// *block_y2,
// *scan_x1,
// *scan_y1,
// *scan_x2,
// *scan_y2,
// use_absolute);

	if(use_absolute)
	{
// scan is always out of range before block.
		if(*scan_x1 < 0)
		{
			int difference = -*scan_x1;
			*block_x1 += difference;
			*scan_x1 = 0;
		}

		if(*scan_y1 < 0)
		{
			int difference = -*scan_y1;
			*block_y1 += difference;
			*scan_y1 = 0;
		}

		if(*scan_x2 > w)
		{
			int difference = *scan_x2 - w;
			*block_x2 -= difference;
			*scan_x2 -= difference;
		}

		if(*scan_y2 > h)
		{
			int difference = *scan_y2 - h;
			*block_y2 -= difference;
			*scan_y2 -= difference;
		}

		CLAMP(*scan_x1, 0, w);
		CLAMP(*scan_y1, 0, h);
		CLAMP(*scan_x2, 0, w);
		CLAMP(*scan_y2, 0, h);
	}
	else
	{
		if(*scan_x1 < 0)
		{
			int difference = -*scan_x1;
			*block_x1 += difference;
			*scan_x2 += difference;
			*scan_x1 = 0;
		}

		if(*scan_y1 < 0)
		{
			int difference = -*scan_y1;
			*block_y1 += difference;
			*scan_y2 += difference;
			*scan_y1 = 0;
		}

		if(*scan_x2 - *block_x1 + *block_x2 > w)
		{
			int difference = *scan_x2 - *block_x1 + *block_x2 - w;
			*block_x2 -= difference;
		}

		if(*scan_y2 - *block_y1 + *block_y2 > h)
		{
			int difference = *scan_y2 - *block_y1 + *block_y2 - h;
			*block_y2 -= difference;
		}

// 		CLAMP(*scan_x1, 0, w - (*block_x2 - *block_x1));
// 		CLAMP(*scan_y1, 0, h - (*block_y2 - *block_y1));
// 		CLAMP(*scan_x2, 0, w - (*block_x2 - *block_x1));
// 		CLAMP(*scan_y2, 0, h - (*block_y2 - *block_y1));
	}

// Sanity checks which break the calculation but should never happen if the
// center of the block is inside the frame.
	CLAMP(*block_x1, 0, w);
	CLAMP(*block_x2, 0, w);
	CLAMP(*block_y1, 0, h);
	CLAMP(*block_y2, 0, h);

// printf("MotionMain::clamp_scan 2 w=%d h=%d block=%d %d %d %d scan=%d %d %d %d absolute=%d\n",
// w,
// h,
// *block_x1,
// *block_y1,
// *block_x2,
// *block_y2,
// *scan_x1,
// *scan_y1,
// *scan_x2,
// *scan_y2,
// use_absolute);
}