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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2004 The ScummVM project
*
* 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.
*
* $Header$
*
*/
#include "common/scaler/intern.h"
#include "common/scaler/scalebit.h"
#include "common/util.h"
int gBitFormat = 565;
// RGB-to-YUV lookup table
extern "C" {
#ifdef USE_NASM
// NOTE: if your compiler uses different mangled names, add another
// condition here
#ifndef _WIN32
#define RGBtoYUV _RGBtoYUV
#define LUT16to32 _LUT16to32
#endif
#endif
uint RGBtoYUV[65536];
uint LUT16to32[65536];
}
static const uint16 dotmatrix_565[16] = {
0x01E0, 0x0007, 0x3800, 0x0000,
0x39E7, 0x0000, 0x39E7, 0x0000,
0x3800, 0x0000, 0x01E0, 0x0007,
0x39E7, 0x0000, 0x39E7, 0x0000
};
static const uint16 dotmatrix_555[16] = {
0x00E0, 0x0007, 0x1C00, 0x0000,
0x1CE7, 0x0000, 0x1CE7, 0x0000,
0x1C00, 0x0000, 0x00E0, 0x0007,
0x1CE7, 0x0000, 0x1CE7, 0x0000
};
static const uint16 *dotmatrix;
static void InitLUT(uint32 BitFormat);
void InitScalers(uint32 BitFormat) {
if (BitFormat == 565) {
dotmatrix = dotmatrix_565;
} else if (BitFormat == 555) {
dotmatrix = dotmatrix_555;
} else {
error("Unknown bit format %d", BitFormat);
}
gBitFormat = BitFormat;
InitLUT(BitFormat);
}
void InitLUT(uint32 BitFormat) {
int r, g, b;
int Y, u, v;
int gInc, gShift;
for (int i = 0; i < 65536; i++) {
LUT16to32[i] = ((i & 0xF800) << 8) + ((i & 0x07E0) << 5) + ((i & 0x001F) << 3);
}
if (BitFormat == 565) {
gInc = 256 >> 6;
gShift = 6 - 3;
} else {
gInc = 256 >> 5;
gShift = 5 - 3;
}
for (r = 0; r < 256; r += 8) {
for (g = 0; g < 256; g += gInc) {
for (b = 0; b < 256; b += 8) {
Y = (r + g + b) >> 2;
u = 128 + ((r - b) >> 2);
v = 128 + ((-r + 2 * g - b) >> 3);
RGBtoYUV[ (r << (5 + gShift)) + (g << gShift) + (b >> 3) ] = (Y << 16) + (u << 8) + v;
}
}
}
}
/**
* Trivial 'scaler' - in fact it doesn't do any scaling but just copies the
* source to the destionation.
*/
void Normal1x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
while (height--) {
memcpy(dstPtr, srcPtr, 2 * width);
srcPtr += srcPitch;
dstPtr += dstPitch;
}
}
/**
* Trivial nearest-neighbour 2x scaler.
*/
void Normal2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
uint8 *r;
assert(((int)dstPtr & 3) == 0);
while (height--) {
r = dstPtr;
for (int i = 0; i < width; ++i, r += 4) {
uint32 color = *(((const uint16 *)srcPtr) + i);
color |= color << 16;
*(uint32 *)(r) = color;
*(uint32 *)(r + dstPitch) = color;
}
srcPtr += srcPitch;
dstPtr += dstPitch << 1;
}
}
/**
* Trivial nearest-neighbour 3x scaler.
*/
void Normal3x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
uint8 *r;
const uint32 dstPitch2 = dstPitch * 2;
const uint32 dstPitch3 = dstPitch * 3;
assert(((int)dstPtr & 1) == 0);
while (height--) {
r = dstPtr;
for (int i = 0; i < width; ++i, r += 6) {
uint16 color = *(((const uint16 *)srcPtr) + i);
*(uint16 *)(r + 0) = color;
*(uint16 *)(r + 2) = color;
*(uint16 *)(r + 4) = color;
*(uint16 *)(r + 0 + dstPitch) = color;
*(uint16 *)(r + 2 + dstPitch) = color;
*(uint16 *)(r + 4 + dstPitch) = color;
*(uint16 *)(r + 0 + dstPitch2) = color;
*(uint16 *)(r + 2 + dstPitch2) = color;
*(uint16 *)(r + 4 + dstPitch2) = color;
}
srcPtr += srcPitch;
dstPtr += dstPitch3;
}
}
/**
* The Scale2x filter, also known as AdvMame2x.
* See also http://scale2x.sourceforge.net
*/
void AdvMame2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
scale(2, dstPtr, dstPitch, srcPtr - srcPitch, srcPitch, 2, width, height);
}
/**
* The Scale3x filter, also known as AdvMame3x.
* See also http://scale2x.sourceforge.net
*/
void AdvMame3x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
scale(3, dstPtr, dstPitch, srcPtr - srcPitch, srcPitch, 2, width, height);
}
template<int bitFormat>
void TV2xTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
const uint32 nextlineSrc = srcPitch / sizeof(uint16);
const uint16 *p = (const uint16 *)srcPtr;
const uint32 nextlineDst = dstPitch / sizeof(uint16);
uint16 *q = (uint16 *)dstPtr;
while (height--) {
for (int i = 0, j = 0; i < width; ++i, j += 2) {
uint16 p1 = *(p + i);
uint32 pi;
pi = (((p1 & redblueMask) * 7) >> 3) & redblueMask;
pi |= (((p1 & greenMask) * 7) >> 3) & greenMask;
*(q + j) = p1;
*(q + j + 1) = p1;
*(q + j + nextlineDst) = (uint16)pi;
*(q + j + nextlineDst + 1) = (uint16)pi;
}
p += nextlineSrc;
q += nextlineDst << 1;
}
}
MAKE_WRAPPER(TV2x)
static inline uint16 DOT_16(uint16 c, int j, int i) {
return c - ((c >> 2) & *(dotmatrix + ((j & 3) << 2) + (i & 3)));
}
// FIXME: This scaler doesn't quite work. Either it needs to know where on the
// screen it's drawing, or the dirty rects will have to be adjusted so that
// access to the dotmatrix array are made in a consistent way. (Doing that in
// a way that also works together with aspect-ratio correction is left as an
// exercise for the reader.)
void DotMatrix(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
const uint32 nextlineSrc = srcPitch / sizeof(uint16);
const uint16 *p = (const uint16 *)srcPtr;
const uint32 nextlineDst = dstPitch / sizeof(uint16);
uint16 *q = (uint16 *)dstPtr;
for (int j = 0, jj = 0; j < height; ++j, jj += 2) {
for (int i = 0, ii = 0; i < width; ++i, ii += 2) {
uint16 c = *(p + i);
*(q + ii) = DOT_16(c, jj, ii);
*(q + ii + 1) = DOT_16(c, jj, ii + 1);
*(q + ii + nextlineDst) = DOT_16(c, jj + 1, ii);
*(q + ii + nextlineDst + 1) = DOT_16(c, jj + 1, ii + 1);
}
p += nextlineSrc;
q += nextlineDst << 1;
}
}
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