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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "graphics/scaler/intern.h"
#include "graphics/scaler/scalebit.h"
#include "common/util.h"
int gBitFormat = 565;
static const Graphics::PixelFormat gPixelFormat555 = {
2,
3, 3, 3, 8,
10, 5, 0, 0
};
static const Graphics::PixelFormat gPixelFormat565 = {
2,
3, 2, 3, 8,
11, 5, 0, 0
};
#ifndef DISABLE_HQ_SCALERS
// RGB-to-YUV lookup table
extern "C" {
#ifdef USE_NASM
// NOTE: if your compiler uses different mangled names, add another
// condition here
#if !defined(_WIN32) && !defined(MACOSX) && !defined(__OS2__)
#define RGBtoYUV _RGBtoYUV
#define LUT16to32 _LUT16to32
#define hqx_highbits _hqx_highbits
#define hqx_lowbits _hqx_lowbits
#endif
#endif
uint32 hqx_highbits = 0xF7DEF7DE;
uint32 hqx_lowbits = 0x0821;
// FIXME/TODO: The following two tables suck up 512 KB. This is bad.
// In addition we never free them...
//
// Note: a memory lookup table is *not* necessarily faster than computing
// these things on the fly, because of its size. Both tables together, plus
// the code, plus the input/output GFX data, won't fit in the cache on many
// systems, so main memory has to be accessed, which is about the worst thing
// that can happen to code which tries to be fast...
//
// So we should think about ways to get these smaller / removed. The LUT16to32
// is only used by the HQX asm right now; maybe somebody can modify the code
// there to work w/o it (and do some benchmarking, too?). To do that, just
// do the conversion on the fly, or even do w/o it (as the C++ code manages to),
// by making different versions of the code based on gBitFormat (or by writing
// bit masks into registers which are computed based on gBitFormat).
//
// RGBtoYUV is also used by the C(++) version of the HQX code. Maybe we can
// use the same technique which is employed by our MPEG code to reduce the
// size of the lookup tables at the cost of some additional computations? That
// might actually result in a speedup, too, if done right (and the code code
// might actually be suitable for AltiVec/MMX/SSE speedup).
//
// Of course, the above is largely a conjecture, and the actual speed
// differences are likely to vary a lot between different architectures and
// CPUs.
uint32 *RGBtoYUV = 0;
uint32 *LUT16to32 = 0;
}
void InitLUT(Graphics::PixelFormat format) {
uint8 r, g, b;
int Y, u, v;
assert(format.bytesPerPixel == 2);
// Allocate the YUV/LUT buffers on the fly if needed.
if (RGBtoYUV == 0)
RGBtoYUV = (uint32 *)malloc(65536 * sizeof(uint32));
if (LUT16to32 == 0)
LUT16to32 = (uint32 *)malloc(65536 * sizeof(uint32));
for (int color = 0; color < 65536; ++color) {
format.colorToRGB(color, r, g, b);
LUT16to32[color] = (r << 16) | (g << 8) | b;
Y = (r + g + b) >> 2;
u = 128 + ((r - b) >> 2);
v = 128 + ((-r + 2 * g - b) >> 3);
RGBtoYUV[color] = (Y << 16) | (u << 8) | v;
}
}
#endif
void InitScalers(uint32 BitFormat) {
gBitFormat = BitFormat;
#ifndef DISABLE_HQ_SCALERS
#undef kHighBitsMask;
#undef kLowBitsMask;
if (gBitFormat == 555) {
InitLUT(Graphics::createPixelFormat<555>());
#ifdef USE_NASM
hqx_highbits = Graphics::ColorMasks<555>::kHighBitsMask;
hqx_lowbits = Graphics::ColorMasks<555>::kLowBitsMask & 0xFFFF;
#endif
}
if (gBitFormat == 565) {
InitLUT(Graphics::createPixelFormat<565>());
#ifdef USE_NASM
hqx_highbits = Graphics::ColorMasks<565>::kHighBitsMask;
hqx_lowbits = Graphics::ColorMasks<565>::kLowBitsMask & 0xFFFF;
#endif
}
#endif
}
void DestroyScalers(){
#ifndef DISABLE_HQ_SCALERS
free(RGBtoYUV);
free(LUT16to32);
RGBtoYUV = 0;
LUT16to32 = 0;
#endif
}
/**
* 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) {
// Spot the case when it can all be done in 1 hit
if (((int)srcPitch == 2 * width) && ((int)dstPitch == 2 * width)) {
width *= height;
height = 1;
}
while (height--) {
memcpy(dstPtr, srcPtr, 2 * width);
srcPtr += srcPitch;
dstPtr += dstPitch;
}
}
#ifndef DISABLE_SCALERS
/**
* Trivial nearest-neighbour 2x scaler.
*/
void Normal2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
uint8 *r;
assert(((long)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(((long)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;
}
}
#define interpolate32_1_1 interpolate32_1_1<bitFormat>
#define interpolate32_1_1_1_1 interpolate32_1_1_1_1<bitFormat>
/**
* Trivial nearest-neighbour 1.5x scaler.
*/
template<int bitFormat>
void Normal1o5xTemplate(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;
const uint32 srcPitch2 = srcPitch * 2;
assert(((long)dstPtr & 1) == 0);
while (height > 0) {
r = dstPtr;
for (int i = 0; i < width; i += 2, r += 6) {
uint16 color0 = *(((const uint16 *)srcPtr) + i);
uint16 color1 = *(((const uint16 *)srcPtr) + i + 1);
uint16 color2 = *(((const uint16 *)(srcPtr + srcPitch)) + i);
uint16 color3 = *(((const uint16 *)(srcPtr + srcPitch)) + i + 1);
*(uint16 *)(r + 0) = color0;
*(uint16 *)(r + 2) = interpolate32_1_1(color0, color1);
*(uint16 *)(r + 4) = color1;
*(uint16 *)(r + 0 + dstPitch) = interpolate32_1_1(color0, color2);
*(uint16 *)(r + 2 + dstPitch) = interpolate32_1_1_1_1(color0, color1, color2, color3);
*(uint16 *)(r + 4 + dstPitch) = interpolate32_1_1(color1, color3);
*(uint16 *)(r + 0 + dstPitch2) = color2;
*(uint16 *)(r + 2 + dstPitch2) = interpolate32_1_1(color2, color3);
*(uint16 *)(r + 4 + dstPitch2) = color3;
}
srcPtr += srcPitch2;
dstPtr += dstPitch3;
height -= 2;
}
}
MAKE_WRAPPER(Normal1o5x)
/**
* 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 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 inline uint16 DOT_16(const uint16 *dotmatrix, 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 uint16 *dotmatrix;
if (gBitFormat == 565) {
dotmatrix = dotmatrix_565;
} else if (gBitFormat == 555) {
dotmatrix = dotmatrix_555;
} else {
error("Unknown bit format %d", gBitFormat);
}
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(dotmatrix, c, jj, ii);
*(q + ii + 1) = DOT_16(dotmatrix, c, jj, ii + 1);
*(q + ii + nextlineDst) = DOT_16(dotmatrix, c, jj + 1, ii);
*(q + ii + nextlineDst + 1) = DOT_16(dotmatrix, c, jj + 1, ii + 1);
}
p += nextlineSrc;
q += nextlineDst << 1;
}
}
#endif
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