/*
Copyright (C) 2003 Rice1964

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 "stdafx.h"


/************************************************************************/
/* hq2x filters                                                         */
/************************************************************************/

/***************************************************************************/
/* Basic types */

/***************************************************************************/
/* interpolation */

static unsigned interp_bits_per_pixel;

#define INTERP_16_MASK_1_3(v) ((v)&0x0F0F)
#define INTERP_16_MASK_SHIFT_2_4(v) (((v)&0xF0F0)>>4)
#define INTERP_16_MASK_SHIFTBACK_2_4(v) ((INTERP_16_MASK_1_3(v))<<4)

static inline uint16 hq2x_interp_16_521(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*5 + INTERP_16_MASK_1_3(p2)*2 + INTERP_16_MASK_1_3(p3)*1) / 8)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*5 + INTERP_16_MASK_SHIFT_2_4(p2)*2 + INTERP_16_MASK_SHIFT_2_4(p3)*1) / 8);
}

static inline uint16 hq2x_interp_16_332(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*3 + INTERP_16_MASK_1_3(p2)*3 + INTERP_16_MASK_1_3(p3)*2) / 8)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*3 + INTERP_16_MASK_SHIFT_2_4(p2)*3 + INTERP_16_MASK_SHIFT_2_4(p3)*2) / 8);
}

static inline uint16 hq2x_interp_16_611(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*6 + INTERP_16_MASK_1_3(p2) + INTERP_16_MASK_1_3(p3)) / 8)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*6 + INTERP_16_MASK_SHIFT_2_4(p2) + INTERP_16_MASK_SHIFT_2_4(p3)) / 8);
}

static inline uint16 hq2x_interp_16_71(uint16 p1, uint16 p2)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*7 + INTERP_16_MASK_1_3(p2)) / 8)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*7 + INTERP_16_MASK_SHIFT_2_4(p2)) / 8);
}

static inline uint16 hq2x_interp_16_211(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*2 + INTERP_16_MASK_1_3(p2) + INTERP_16_MASK_1_3(p3)) / 4)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*2 + INTERP_16_MASK_SHIFT_2_4(p2) + INTERP_16_MASK_SHIFT_2_4(p3)) / 4);
}

static inline uint16 hq2x_interp_16_772(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3(((INTERP_16_MASK_1_3(p1) + INTERP_16_MASK_1_3(p2))*7 + INTERP_16_MASK_1_3(p3)*2) / 16)
		| INTERP_16_MASK_SHIFTBACK_2_4(((INTERP_16_MASK_SHIFT_2_4(p1) + INTERP_16_MASK_SHIFT_2_4(p2))*7 + INTERP_16_MASK_SHIFT_2_4(p3)*2) / 16);
}

static inline uint16 hq2x_interp_16_11(uint16 p1, uint16 p2)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1) + INTERP_16_MASK_1_3(p2)) / 2)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1) + INTERP_16_MASK_SHIFT_2_4(p2)) / 2);
}

static inline uint16 hq2x_interp_16_31(uint16 p1, uint16 p2)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*3 + INTERP_16_MASK_1_3(p2)) / 4)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*3 + INTERP_16_MASK_SHIFT_2_4(p2)) / 4);
}

static inline uint16 hq2x_interp_16_1411(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*14 + INTERP_16_MASK_1_3(p2) + INTERP_16_MASK_1_3(p3)) / 16)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*14 + INTERP_16_MASK_SHIFT_2_4(p2) + INTERP_16_MASK_SHIFT_2_4(p3)) / 16);
}

static inline uint16 hq2x_interp_16_431(uint16 p1, uint16 p2, uint16 p3)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*4 + INTERP_16_MASK_1_3(p2)*3 + INTERP_16_MASK_1_3(p3)) / 8)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*4 + INTERP_16_MASK_SHIFT_2_4(p2)*3 + INTERP_16_MASK_SHIFT_2_4(p3)) / 8);
}

static inline uint16 hq2x_interp_16_53(uint16 p1, uint16 p2)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*5 + INTERP_16_MASK_1_3(p2)*3) / 8)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*5 + INTERP_16_MASK_SHIFT_2_4(p2)*3) / 8);
}

static inline uint16 hq2x_interp_16_151(uint16 p1, uint16 p2)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*15 + INTERP_16_MASK_1_3(p2)) / 16)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*15 + INTERP_16_MASK_SHIFT_2_4(p2)) / 16);
}

static inline uint16 hq2x_interp_16_97(uint16 p1, uint16 p2)
{
	return INTERP_16_MASK_1_3((INTERP_16_MASK_1_3(p1)*9 + INTERP_16_MASK_1_3(p2)*7) / 16)
		| INTERP_16_MASK_SHIFTBACK_2_4((INTERP_16_MASK_SHIFT_2_4(p1)*9 + INTERP_16_MASK_SHIFT_2_4(p2)*7) / 16);
}

#define INTERP_32_MASK_1_3(v) ((v)&0x00FF00FF)
#define INTERP_32_MASK_SHIFT_2_4(v) (((v)&0xFF00FF00)>>8)
#define INTERP_32_MASK_SHIFTBACK_2_4(v) (((INTERP_32_MASK_1_3(v))<<8))

static inline uint32 hq2x_interp_32_521(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*5 + INTERP_32_MASK_1_3(p2)*2 + INTERP_32_MASK_1_3(p3)*1) / 8)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*5 + INTERP_32_MASK_SHIFT_2_4(p2)*2 + INTERP_32_MASK_SHIFT_2_4(p3)*1) / 8);
}

static inline uint32 hq2x_interp_32_332(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*3 + INTERP_32_MASK_1_3(p2)*3 + INTERP_32_MASK_1_3(p3)*2) / 8)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*3 + INTERP_32_MASK_SHIFT_2_4(p2)*3 + INTERP_32_MASK_SHIFT_2_4(p3)*2) / 8);
}

static inline uint32 hq2x_interp_32_211(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*2 + INTERP_32_MASK_1_3(p2) + INTERP_32_MASK_1_3(p3)) / 4)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*2 + INTERP_32_MASK_SHIFT_2_4(p2) + INTERP_32_MASK_SHIFT_2_4(p3)) / 4);
}

static inline uint32 hq2x_interp_32_611(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*6 + INTERP_32_MASK_1_3(p2) + INTERP_32_MASK_1_3(p3)) / 8)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*6 + INTERP_32_MASK_SHIFT_2_4(p2) + INTERP_32_MASK_SHIFT_2_4(p3)) / 8);
}

static inline uint32 hq2x_interp_32_71(uint32 p1, uint32 p2)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*7 + INTERP_32_MASK_1_3(p2)) / 8)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*7 + INTERP_32_MASK_SHIFT_2_4(p2)) / 8);
}

static inline uint32 hq2x_interp_32_772(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3(((INTERP_32_MASK_1_3(p1) + INTERP_32_MASK_1_3(p2))*7 + INTERP_32_MASK_1_3(p3)*2) / 16)
		| INTERP_32_MASK_SHIFTBACK_2_4(((INTERP_32_MASK_SHIFT_2_4(p1) + INTERP_32_MASK_SHIFT_2_4(p2))*7 + INTERP_32_MASK_SHIFT_2_4(p3)*2) / 16);
}

static inline uint32 hq2x_interp_32_11(uint32 p1, uint32 p2)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1) + INTERP_32_MASK_1_3(p2)) / 2)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1) + INTERP_32_MASK_SHIFT_2_4(p2)) / 2);
}

static inline uint32 hq2x_interp_32_31(uint32 p1, uint32 p2)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*3 + INTERP_32_MASK_1_3(p2)) / 4)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*3 + INTERP_32_MASK_SHIFT_2_4(p2)) / 4);
}

static inline uint32 hq2x_interp_32_1411(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*14 + INTERP_32_MASK_1_3(p2) + INTERP_32_MASK_1_3(p3)) / 16)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*14 + INTERP_32_MASK_SHIFT_2_4(p2) + INTERP_32_MASK_SHIFT_2_4(p3)) / 16);
}

static inline uint32 hq2x_interp_32_431(uint32 p1, uint32 p2, uint32 p3)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*4 + INTERP_32_MASK_1_3(p2)*3 + INTERP_32_MASK_1_3(p3)) / 8)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*4 + INTERP_32_MASK_SHIFT_2_4(p2)*3 + INTERP_32_MASK_SHIFT_2_4(p3)) / 8);
}

static inline uint32 hq2x_interp_32_53(uint32 p1, uint32 p2)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*5 + INTERP_32_MASK_1_3(p2)*3) / 8)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*5 + INTERP_32_MASK_SHIFT_2_4(p2)*3) / 8);
}

static inline uint32 hq2x_interp_32_151(uint32 p1, uint32 p2)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*15 + INTERP_32_MASK_1_3(p2)) / 16)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*15 + INTERP_32_MASK_SHIFT_2_4(p2)) / 16);
}

static inline uint32 hq2x_interp_32_97(uint32 p1, uint32 p2)
{
	return INTERP_32_MASK_1_3((INTERP_32_MASK_1_3(p1)*9 + INTERP_32_MASK_1_3(p2)*7) / 16)
		| INTERP_32_MASK_SHIFTBACK_2_4((INTERP_32_MASK_SHIFT_2_4(p1)*9 + INTERP_32_MASK_SHIFT_2_4(p2)*7) / 16);
}

/***************************************************************************/
/* diff */

#define INTERP_Y_LIMIT (0x30*4)
#define INTERP_U_LIMIT (0x07*4)
#define INTERP_V_LIMIT (0x06*8)

static int hq2x_interp_16_diff(uint16 p1, uint16 p2)
{
	int r, g, b;
	int y, u, v;

	if (p1 == p2)
		return 0;

	b = (int)((p1 & 0x000F) - (p2 & 0x000F));
	g = (int)((p1 & 0x00F0) - (p2 & 0x00F0)) >> 4;
	r = (int)((p1 & 0x0F00) - (p2 & 0x0F00)) >> 8;

	y = r + g + b;
	u = r - b;
	v = -r + 2*g - b;

	if (y < -INTERP_Y_LIMIT || y > INTERP_Y_LIMIT)
		return 1;

	if (u < -INTERP_U_LIMIT || u > INTERP_U_LIMIT)
		return 1;

	if (v < -INTERP_V_LIMIT || v > INTERP_V_LIMIT)
		return 1;

	return 0;
}

static int hq2x_interp_32_diff(uint32 p1, uint32 p2)
{
	int r, g, b;
	int y, u, v;

	if ((p1 & 0xF8F8F8) == (p2 & 0xF8F8F8))
		return 0;

	b = (int)((p1 & 0xFF) - (p2 & 0xFF));
	g = (int)((p1 & 0xFF00) - (p2 & 0xFF00)) >> 8;
	r = (int)((p1 & 0xFF0000) - (p2 & 0xFF0000)) >> 16;

	y = r + g + b;
	u = r - b;
	v = -r + 2*g - b;

	if (y < -INTERP_Y_LIMIT || y > INTERP_Y_LIMIT)
		return 1;

	if (u < -INTERP_U_LIMIT || u > INTERP_U_LIMIT)
		return 1;

	if (v < -INTERP_V_LIMIT || v > INTERP_V_LIMIT)
		return 1;

	return 0;
}

static void interp_set(unsigned bits_per_pixel)
{
	interp_bits_per_pixel = bits_per_pixel;
}


static void hq2x_16_def(uint16* dst0, uint16* dst1, const uint16* src0, const uint16* src1, const uint16* src2, unsigned count)
{
	unsigned i;

	for(i=0;i<count;++i) {
		unsigned char mask;

		uint16 c[9];

		c[1] = src0[0];
		c[4] = src1[0];
		c[7] = src2[0];

		if (i>0) {
			c[0] = src0[-1];
			c[3] = src1[-1];
			c[6] = src2[-1];
		} else {
			c[0] = c[1];
			c[3] = c[4];
			c[6] = c[7];
		}

		if (i<count-1) {
			c[2] = src0[1];
			c[5] = src1[1];
			c[8] = src2[1];
		} else {
			c[2] = c[1];
			c[5] = c[4];
			c[8] = c[7];
		}

		mask = 0;

		if (hq2x_interp_16_diff(c[0], c[4]))
			mask |= 1 << 0;
		if (hq2x_interp_16_diff(c[1], c[4]))
			mask |= 1 << 1;
		if (hq2x_interp_16_diff(c[2], c[4]))
			mask |= 1 << 2;
		if (hq2x_interp_16_diff(c[3], c[4]))
			mask |= 1 << 3;
		if (hq2x_interp_16_diff(c[5], c[4]))
			mask |= 1 << 4;
		if (hq2x_interp_16_diff(c[6], c[4]))
			mask |= 1 << 5;
		if (hq2x_interp_16_diff(c[7], c[4]))
			mask |= 1 << 6;
		if (hq2x_interp_16_diff(c[8], c[4]))
			mask |= 1 << 7;

#define P0 dst0[0]
#define P1 dst0[1]
#define P2 dst1[0]
#define P3 dst1[1]
#define HQ2X_MUR hq2x_interp_16_diff(c[1], c[5])
#define HQ2X_MDR hq2x_interp_16_diff(c[5], c[7])
#define HQ2X_MDL hq2x_interp_16_diff(c[7], c[3])
#define HQ2X_MUL hq2x_interp_16_diff(c[3], c[1])
#define IC(p0) c[p0]
#define I11(p0,p1) hq2x_interp_16_11(c[p0], c[p1])
#define I211(p0,p1,p2) hq2x_interp_16_211(c[p0], c[p1], c[p2])
#define I31(p0,p1) hq2x_interp_16_31(c[p0], c[p1])
#define I332(p0,p1,p2) hq2x_interp_16_332(c[p0], c[p1], c[p2])
#define I431(p0,p1,p2) hq2x_interp_16_431(c[p0], c[p1], c[p2])
#define I521(p0,p1,p2) hq2x_interp_16_521(c[p0], c[p1], c[p2])
#define I53(p0,p1) hq2x_interp_16_53(c[p0], c[p1])
#define I611(p0,p1,p2) hq2x_interp_16_611(c[p0], c[p1], c[p2])
#define I71(p0,p1) hq2x_interp_16_71(c[p0], c[p1])
#define I772(p0,p1,p2) hq2x_interp_16_772(c[p0], c[p1], c[p2])
#define I97(p0,p1) hq2x_interp_16_97(c[p0], c[p1])
#define I1411(p0,p1,p2) hq2x_interp_16_1411(c[p0], c[p1], c[p2])
#define I151(p0,p1) hq2x_interp_16_151(c[p0], c[p1])

		switch (mask) {
#include "TextureFilters_hq2x.h"
		}

#undef P0
#undef P1
#undef P2
#undef P3
#undef HQ2X_MUR
#undef HQ2X_MDR
#undef HQ2X_MDL
#undef HQ2X_MUL
#undef IC
#undef I11
#undef I211
#undef I31
#undef I332
#undef I431
#undef I521
#undef I53
#undef I611
#undef I71
#undef I772
#undef I97
#undef I1411
#undef I151

		src0 += 1;
		src1 += 1;
		src2 += 1;
		dst0 += 2;
		dst1 += 2;
	}
}

static void hq2x_32_def(uint32* dst0, uint32* dst1, const uint32* src0, const uint32* src1, const uint32* src2, unsigned count)
{
	unsigned i;

	for(i=0;i<count;++i) {
		unsigned char mask;

		uint32 c[9];

		c[1] = src0[0];
		c[4] = src1[0];
		c[7] = src2[0];

		if (i>0) {
			c[0] = src0[-1];
			c[3] = src1[-1];
			c[6] = src2[-1];
		} else {
			c[0] = src0[0];
			c[3] = src1[0];
			c[6] = src2[0];
		}

		if (i<count-1) {
			c[2] = src0[1];
			c[5] = src1[1];
			c[8] = src2[1];
		} else {
			c[2] = src0[0];
			c[5] = src1[0];
			c[8] = src2[0];
		}

		mask = 0;

		if (hq2x_interp_32_diff(c[0], c[4]))
			mask |= 1 << 0;
		if (hq2x_interp_32_diff(c[1], c[4]))
			mask |= 1 << 1;
		if (hq2x_interp_32_diff(c[2], c[4]))
			mask |= 1 << 2;
		if (hq2x_interp_32_diff(c[3], c[4]))
			mask |= 1 << 3;
		if (hq2x_interp_32_diff(c[5], c[4]))
			mask |= 1 << 4;
		if (hq2x_interp_32_diff(c[6], c[4]))
			mask |= 1 << 5;
		if (hq2x_interp_32_diff(c[7], c[4]))
			mask |= 1 << 6;
		if (hq2x_interp_32_diff(c[8], c[4]))
			mask |= 1 << 7;

#define P0 dst0[0]
#define P1 dst0[1]
#define P2 dst1[0]
#define P3 dst1[1]
#define HQ2X_MUR hq2x_interp_32_diff(c[1], c[5])
#define HQ2X_MDR hq2x_interp_32_diff(c[5], c[7])
#define HQ2X_MDL hq2x_interp_32_diff(c[7], c[3])
#define HQ2X_MUL hq2x_interp_32_diff(c[3], c[1])
#define IC(p0) c[p0]
#define I11(p0,p1) hq2x_interp_32_11(c[p0], c[p1])
#define I211(p0,p1,p2) hq2x_interp_32_211(c[p0], c[p1], c[p2])
#define I31(p0,p1) hq2x_interp_32_31(c[p0], c[p1])
#define I332(p0,p1,p2) hq2x_interp_32_332(c[p0], c[p1], c[p2])
#define I431(p0,p1,p2) hq2x_interp_32_431(c[p0], c[p1], c[p2])
#define I521(p0,p1,p2) hq2x_interp_32_521(c[p0], c[p1], c[p2])
#define I53(p0,p1) hq2x_interp_32_53(c[p0], c[p1])
#define I611(p0,p1,p2) hq2x_interp_32_611(c[p0], c[p1], c[p2])
#define I71(p0,p1) hq2x_interp_32_71(c[p0], c[p1])
#define I772(p0,p1,p2) hq2x_interp_32_772(c[p0], c[p1], c[p2])
#define I97(p0,p1) hq2x_interp_32_97(c[p0], c[p1])
#define I1411(p0,p1,p2) hq2x_interp_32_1411(c[p0], c[p1], c[p2])
#define I151(p0,p1) hq2x_interp_32_151(c[p0], c[p1])

		switch (mask) {
#include "TextureFilters_hq2x.h"
		}

#undef P0
#undef P1
#undef P2
#undef P3
#undef HQ2X_MUR
#undef HQ2X_MDR
#undef HQ2X_MDL
#undef HQ2X_MUL
#undef IC
#undef I11
#undef I211
#undef I31
#undef I332
#undef I431
#undef I521
#undef I53
#undef I611
#undef I71
#undef I772
#undef I97
#undef I1411
#undef I151

		src0 += 1;
		src1 += 1;
		src2 += 1;
		dst0 += 2;
		dst1 += 2;
	}
}

/***************************************************************************/
/* LQ2x C implementation */

/*
* This effect is derived from the hq2x effect made by Maxim Stepin
*/

static void lq2x_16_def(uint16* dst0, uint16* dst1, const uint16* src0, const uint16* src1, const uint16* src2, unsigned count)
{
	unsigned i;

	for(i=0;i<count;++i) {
		unsigned char mask;

		uint16 c[9];

		c[1] = src0[0];
		c[4] = src1[0];
		c[7] = src2[0];

		if (i>0) {
			c[0] = src0[-1];
			c[3] = src1[-1];
			c[6] = src2[-1];
		} else {
			c[0] = c[1];
			c[3] = c[4];
			c[6] = c[7];
		}

		if (i<count-1) {
			c[2] = src0[1];
			c[5] = src1[1];
			c[8] = src2[1];
		} else {
			c[2] = c[1];
			c[5] = c[4];
			c[8] = c[7];
		}

		mask = 0;

		if (c[0] != c[4])
			mask |= 1 << 0;
		if (c[1] != c[4])
			mask |= 1 << 1;
		if (c[2] != c[4])
			mask |= 1 << 2;
		if (c[3] != c[4])
			mask |= 1 << 3;
		if (c[5] != c[4])
			mask |= 1 << 4;
		if (c[6] != c[4])
			mask |= 1 << 5;
		if (c[7] != c[4])
			mask |= 1 << 6;
		if (c[8] != c[4])
			mask |= 1 << 7;

#define P0 dst0[0]
#define P1 dst0[1]
#define P2 dst1[0]
#define P3 dst1[1]
#define HQ2X_MUR (c[1] != c[5])
#define HQ2X_MDR (c[5] != c[7])
#define HQ2X_MDL (c[7] != c[3])
#define HQ2X_MUL (c[3] != c[1])
#define IC(p0) c[p0]
#define I11(p0,p1) hq2x_interp_16_11(c[p0], c[p1])
#define I211(p0,p1,p2) hq2x_interp_16_211(c[p0], c[p1], c[p2])
#define I31(p0,p1) hq2x_interp_16_31(c[p0], c[p1])
#define I332(p0,p1,p2) hq2x_interp_16_332(c[p0], c[p1], c[p2])
#define I431(p0,p1,p2) hq2x_interp_16_431(c[p0], c[p1], c[p2])
#define I521(p0,p1,p2) hq2x_interp_16_521(c[p0], c[p1], c[p2])
#define I53(p0,p1) hq2x_interp_16_53(c[p0], c[p1])
#define I611(p0,p1,p2) hq2x_interp_16_611(c[p0], c[p1], c[p2])
#define I71(p0,p1) hq2x_interp_16_71(c[p0], c[p1])
#define I772(p0,p1,p2) hq2x_interp_16_772(c[p0], c[p1], c[p2])
#define I97(p0,p1) hq2x_interp_16_97(c[p0], c[p1])
#define I1411(p0,p1,p2) hq2x_interp_16_1411(c[p0], c[p1], c[p2])
#define I151(p0,p1) hq2x_interp_16_151(c[p0], c[p1])

		switch (mask) {
#include "TextureFilters_lq2x.h"
		}

#undef P0
#undef P1
#undef P2
#undef P3
#undef HQ2X_MUR
#undef HQ2X_MDR
#undef HQ2X_MDL
#undef HQ2X_MUL
#undef IC
#undef I11
#undef I211
#undef I31
#undef I332
#undef I431
#undef I521
#undef I53
#undef I611
#undef I71
#undef I772
#undef I97
#undef I1411
#undef I151

		src0 += 1;
		src1 += 1;
		src2 += 1;
		dst0 += 2;
		dst1 += 2;
	}
}

static void lq2x_32_def(uint32* dst0, uint32* dst1, const uint32* src0, const uint32* src1, const uint32* src2, unsigned count)
{
	unsigned i;

	for(i=0;i<count;++i) {
		unsigned char mask;

		uint32 c[9];

		c[1] = src0[0];
		c[4] = src1[0];
		c[7] = src2[0];

		if (i>0) {
			c[0] = src0[-1];
			c[3] = src1[-1];
			c[6] = src2[-1];
		} else {
			c[0] = c[1];
			c[3] = c[4];
			c[6] = c[7];
		}

		if (i<count-1) {
			c[2] = src0[1];
			c[5] = src1[1];
			c[8] = src2[1];
		} else {
			c[2] = c[1];
			c[5] = c[4];
			c[8] = c[7];
		}

		mask = 0;

		if (c[0] != c[4])
			mask |= 1 << 0;
		if (c[1] != c[4])
			mask |= 1 << 1;
		if (c[2] != c[4])
			mask |= 1 << 2;
		if (c[3] != c[4])
			mask |= 1 << 3;
		if (c[5] != c[4])
			mask |= 1 << 4;
		if (c[6] != c[4])
			mask |= 1 << 5;
		if (c[7] != c[4])
			mask |= 1 << 6;
		if (c[8] != c[4])
			mask |= 1 << 7;

#define P0 dst0[0]
#define P1 dst0[1]
#define P2 dst1[0]
#define P3 dst1[1]
#define HQ2X_MUR (c[1] != c[5])
#define HQ2X_MDR (c[5] != c[7])
#define HQ2X_MDL (c[7] != c[3])
#define HQ2X_MUL (c[3] != c[1])
#define IC(p0) c[p0]
#define I11(p0,p1) hq2x_interp_32_11(c[p0], c[p1])
#define I211(p0,p1,p2) hq2x_interp_32_211(c[p0], c[p1], c[p2])
#define I31(p0,p1) hq2x_interp_32_31(c[p0], c[p1])
#define I332(p0,p1,p2) hq2x_interp_32_332(c[p0], c[p1], c[p2])
#define I431(p0,p1,p2) hq2x_interp_32_431(c[p0], c[p1], c[p2])
#define I521(p0,p1,p2) hq2x_interp_32_521(c[p0], c[p1], c[p2])
#define I53(p0,p1) hq2x_interp_32_53(c[p0], c[p1])
#define I611(p0,p1,p2) hq2x_interp_32_611(c[p0], c[p1], c[p2])
#define I71(p0,p1) hq2x_interp_32_71(c[p0], c[p1])
#define I772(p0,p1,p2) hq2x_interp_32_772(c[p0], c[p1], c[p2])
#define I97(p0,p1) hq2x_interp_32_97(c[p0], c[p1])
#define I1411(p0,p1,p2) hq2x_interp_32_1411(c[p0], c[p1], c[p2])
#define I151(p0,p1) hq2x_interp_32_151(c[p0], c[p1])

		switch (mask) {
#include "TextureFilters_lq2x.h"
		}

#undef P0
#undef P1
#undef P2
#undef P3
#undef HQ2X_MUR
#undef HQ2X_MDR
#undef HQ2X_MDL
#undef HQ2X_MUL
#undef IC
#undef I11
#undef I211
#undef I31
#undef I332
#undef I431
#undef I521
#undef I53
#undef I611
#undef I71
#undef I772
#undef I97
#undef I1411
#undef I151

		src0 += 1;
		src1 += 1;
		src2 += 1;
		dst0 += 2;
		dst1 += 2;
	}
}

void hq2x_16(uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
	uint16 *dst0 = (uint16 *)dstPtr;
	uint16 *dst1 = dst0 + (dstPitch >> 1);

	uint16 *src0 = (uint16 *)srcPtr;
	uint16 *src1 = src0 + (srcPitch >> 1);
	uint16 *src2 = src1 + (srcPitch >> 1);

	hq2x_16_def(dst0, dst1, src0, src0, src1, width);
	if( height == 1 ) return;

	int count = height;

	count -= 2;
	while(count>0) {
		dst0 += dstPitch;
		dst1 += dstPitch;
		hq2x_16_def(dst0, dst1, src0, src1, src2, width);
		src0 = src1;
		src1 = src2;
		src2 += srcPitch >> 1;
		--count;
	}
	dst0 += dstPitch;
	dst1 += dstPitch;
	hq2x_16_def(dst0, dst1, src0, src1, src1, width);
}

void hq2x_32(uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
	uint32 *dst0 = (uint32 *)dstPtr;
	uint32 *dst1 = dst0 + (dstPitch >> 2);

	uint32 *src0 = (uint32 *)srcPtr;
	uint32 *src1 = src0 + (srcPitch >> 2);
	uint32 *src2 = src1 + (srcPitch >> 2);
	hq2x_32_def(dst0, dst1, src0, src0, src1, width);
	if( height == 1 ) return;

	int count = height;

	count -= 2;
	while(count>0) {
		dst0 += dstPitch >> 1;
		dst1 += dstPitch >> 1;
		hq2x_32_def(dst0, dst1, src0, src1, src2, width);
		src0 = src1;
		src1 = src2;
		src2 += srcPitch >> 2;
		--count;
	}
	dst0 += dstPitch >> 1;
	dst1 += dstPitch >> 1;
	hq2x_32_def(dst0, dst1, src0, src1, src1, width);
}

void lq2x_16(uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
	uint16 *dst0 = (uint16 *)dstPtr;
	uint16 *dst1 = dst0 + (dstPitch >> 1);

	uint16 *src0 = (uint16 *)srcPtr;
	uint16 *src1 = src0 + (srcPitch >> 1);
	uint16 *src2 = src1 + (srcPitch >> 1);

	lq2x_16_def(dst0, dst1, src0, src0, src1, width);
	if( height == 1 ) return;

	int count = height;

	count -= 2;
	while(count>0) {
		dst0 += dstPitch;
		dst1 += dstPitch;
		hq2x_16_def(dst0, dst1, src0, src1, src2, width);
		src0 = src1;
		src1 = src2;
		src2 += srcPitch >> 1;
		--count;
	}
	dst0 += dstPitch;
	dst1 += dstPitch;
	lq2x_16_def(dst0, dst1, src0, src1, src1, width);
}

void lq2x_32(uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height)
{
	uint32 *dst0 = (uint32 *)dstPtr;
	uint32 *dst1 = dst0 + (dstPitch >> 2);

	uint32 *src0 = (uint32 *)srcPtr;
	uint32 *src1 = src0 + (srcPitch >> 2);
	uint32 *src2 = src1 + (srcPitch >> 2);
	lq2x_32_def(dst0, dst1, src0, src0, src1, width);
	if( height == 1 ) return;

	int count = height;

	count -= 2;
	while(count>0) {
		dst0 += dstPitch >> 1;
		dst1 += dstPitch >> 1;
		hq2x_32_def(dst0, dst1, src0, src1, src2, width);
		src0 = src1;
		src1 = src2;
		src2 += srcPitch >> 2;
		--count;
	}
	dst0 += dstPitch >> 1;
	dst1 += dstPitch >> 1;
	lq2x_32_def(dst0, dst1, src0, src1, src1, width);
}

void hq2x_init(unsigned bits_per_pixel)
{
	interp_set(bits_per_pixel);
}

/************************************************************************/
/* hq3x filters                                                         */
/************************************************************************/

/************************************************************************/
/* scale2x filters                                                      */
/************************************************************************/

/************************************************************************/
/* scale3x filters                                                      */
/************************************************************************/

