mirror of
https://github.com/libretro/scummvm.git
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319 lines
9.4 KiB
C++
319 lines
9.4 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001 Ludvig Strigeus
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* Copyright (C) 2001-2005 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "common/scaler/intern.h"
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#include "common/scaler/scalebit.h"
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#include "common/util.h"
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int gBitFormat = 565;
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#ifndef DISABLE_HQ_SCALERS
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// RGB-to-YUV lookup table
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extern "C" {
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#ifdef USE_NASM
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// NOTE: if your compiler uses different mangled names, add another
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// condition here
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#ifndef _WIN32
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#define RGBtoYUV _RGBtoYUV
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#define LUT16to32 _LUT16to32
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#endif
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#endif
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// FIXME/TODO: The following two tables suck up 512 KB.
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// They should at least be allocated on the heap, to reduce the size of the
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// binary.
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//
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// Note: a memory lookup table is *not* necessarily faster than computing
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// these things on the fly, because of its size. Both tables together, plus
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// the code, plus the input/output GFX data, won't fit in the cache on many
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// systems, so main memory has to be accessed, which is about the worst thing
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// that can happen to code which tries to be fast...
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//
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// So we should think about ways to get these smaller / removed. The LUT16to32
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// is only used by the HQX asm right now; maybe somebody can modify the code
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// there to work w/o it (and do some benchmarking, too?). To do that, just
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// do the conversion on the fly, or even do w/o it (as the C++ code manages to),
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// by making different versions of the code based on gBitFormat (or by writing
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// bit masks into registers which are computed based on gBitFormat).
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//
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// RGBtoYUV is also used by the C(++) version of the HQX code. Maybe we can
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// use the same technique which is employed by our MPEG code to reduce the
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// size of the lookup tables at the cost of some additional computations? That
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// might actually result in a speedup, too, if done right (and the code code
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// might actually be suitable for AltiVec/MMX/SSE speedup).
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//
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// Of course, the above is largely a conjecture, and the actual speed
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// differences are likely to vary a lot between different architectures and
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// CPUs.
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uint RGBtoYUVstorage[65536];
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uint *RGBtoYUV = RGBtoYUVstorage;
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uint LUT16to32[65536];
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}
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#endif
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static const uint16 dotmatrix_565[16] = {
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0x01E0, 0x0007, 0x3800, 0x0000,
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0x39E7, 0x0000, 0x39E7, 0x0000,
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0x3800, 0x0000, 0x01E0, 0x0007,
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0x39E7, 0x0000, 0x39E7, 0x0000
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};
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static const uint16 dotmatrix_555[16] = {
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0x00E0, 0x0007, 0x1C00, 0x0000,
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0x1CE7, 0x0000, 0x1CE7, 0x0000,
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0x1C00, 0x0000, 0x00E0, 0x0007,
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0x1CE7, 0x0000, 0x1CE7, 0x0000
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};
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static const uint16 *dotmatrix;
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static void InitLUT(uint32 BitFormat);
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void InitScalers(uint32 BitFormat) {
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if (BitFormat == 565) {
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dotmatrix = dotmatrix_565;
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} else if (BitFormat == 555) {
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dotmatrix = dotmatrix_555;
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} else {
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error("Unknown bit format %d", BitFormat);
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}
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gBitFormat = BitFormat;
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InitLUT(BitFormat);
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}
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void InitLUT(uint32 BitFormat) {
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#ifndef DISABLE_HQ_SCALERS
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int r, g, b;
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int Y, u, v;
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int gInc, gShift;
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for (int i = 0; i < 65536; i++) {
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LUT16to32[i] = ((i & 0xF800) << 8) + ((i & 0x07E0) << 5) + ((i & 0x001F) << 3);
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}
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if (BitFormat == 565) {
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gInc = 256 >> 6;
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gShift = 6 - 3;
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} else {
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gInc = 256 >> 5;
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gShift = 5 - 3;
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}
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for (r = 0; r < 256; r += 8) {
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for (g = 0; g < 256; g += gInc) {
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for (b = 0; b < 256; b += 8) {
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Y = (r + g + b) >> 2;
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u = 128 + ((r - b) >> 2);
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v = 128 + ((-r + 2 * g - b) >> 3);
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RGBtoYUV[ (r << (5 + gShift)) + (g << gShift) + (b >> 3) ] = (Y << 16) + (u << 8) + v;
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}
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}
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}
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#endif
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}
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/**
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* Trivial 'scaler' - in fact it doesn't do any scaling but just copies the
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* source to the destionation.
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*/
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void Normal1x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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while (height--) {
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memcpy(dstPtr, srcPtr, 2 * width);
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srcPtr += srcPitch;
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dstPtr += dstPitch;
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}
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}
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/**
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* Trivial nearest-neighbour 2x scaler.
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*/
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void Normal2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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uint8 *r;
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assert(((int)dstPtr & 3) == 0);
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while (height--) {
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r = dstPtr;
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for (int i = 0; i < width; ++i, r += 4) {
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uint32 color = *(((const uint16 *)srcPtr) + i);
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color |= color << 16;
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*(uint32 *)(r) = color;
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*(uint32 *)(r + dstPitch) = color;
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}
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srcPtr += srcPitch;
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dstPtr += dstPitch << 1;
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}
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}
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/**
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* Trivial nearest-neighbour 3x scaler.
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*/
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void Normal3x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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uint8 *r;
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const uint32 dstPitch2 = dstPitch * 2;
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const uint32 dstPitch3 = dstPitch * 3;
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assert(((int)dstPtr & 1) == 0);
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while (height--) {
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r = dstPtr;
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for (int i = 0; i < width; ++i, r += 6) {
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uint16 color = *(((const uint16 *)srcPtr) + i);
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*(uint16 *)(r + 0) = color;
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*(uint16 *)(r + 2) = color;
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*(uint16 *)(r + 4) = color;
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*(uint16 *)(r + 0 + dstPitch) = color;
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*(uint16 *)(r + 2 + dstPitch) = color;
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*(uint16 *)(r + 4 + dstPitch) = color;
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*(uint16 *)(r + 0 + dstPitch2) = color;
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*(uint16 *)(r + 2 + dstPitch2) = color;
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*(uint16 *)(r + 4 + dstPitch2) = color;
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}
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srcPtr += srcPitch;
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dstPtr += dstPitch3;
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}
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}
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#define INTERPOLATE INTERPOLATE<bitFormat>
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#define Q_INTERPOLATE Q_INTERPOLATE<bitFormat>
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/**
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* Trivial nearest-neighbour 1.5x scaler.
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*/
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template<int bitFormat>
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void Normal1o5xTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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uint8 *r;
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const uint32 dstPitch2 = dstPitch * 2;
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const uint32 dstPitch3 = dstPitch * 3;
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const uint32 srcPitch2 = srcPitch * 2;
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assert(((int)dstPtr & 1) == 0);
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while (height > 0) {
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r = dstPtr;
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for (int i = 0; i < width; i += 2, r += 6) {
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uint16 color0 = *(((const uint16 *)srcPtr) + i);
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uint16 color1 = *(((const uint16 *)srcPtr) + i + 1);
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uint16 color2 = *(((const uint16 *)(srcPtr + srcPitch)) + i);
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uint16 color3 = *(((const uint16 *)(srcPtr + srcPitch)) + i + 1);
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*(uint16 *)(r + 0) = color0;
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*(uint16 *)(r + 2) = INTERPOLATE(color0, color1);
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*(uint16 *)(r + 4) = color1;
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*(uint16 *)(r + 0 + dstPitch) = INTERPOLATE(color0, color2);
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*(uint16 *)(r + 2 + dstPitch) = Q_INTERPOLATE(color0, color1, color2, color3);
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*(uint16 *)(r + 4 + dstPitch) = INTERPOLATE(color1, color3);
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*(uint16 *)(r + 0 + dstPitch2) = color2;
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*(uint16 *)(r + 2 + dstPitch2) = INTERPOLATE(color2, color3);
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*(uint16 *)(r + 4 + dstPitch2) = color3;
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}
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srcPtr += srcPitch2;
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dstPtr += dstPitch3;
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height -= 2;
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}
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}
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MAKE_WRAPPER(Normal1o5x)
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/**
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* The Scale2x filter, also known as AdvMame2x.
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* See also http://scale2x.sourceforge.net
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*/
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void AdvMame2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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scale(2, dstPtr, dstPitch, srcPtr - srcPitch, srcPitch, 2, width, height);
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}
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/**
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* The Scale3x filter, also known as AdvMame3x.
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* See also http://scale2x.sourceforge.net
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*/
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void AdvMame3x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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scale(3, dstPtr, dstPitch, srcPtr - srcPitch, srcPitch, 2, width, height);
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}
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template<int bitFormat>
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void TV2xTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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const uint32 nextlineSrc = srcPitch / sizeof(uint16);
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const uint16 *p = (const uint16 *)srcPtr;
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const uint32 nextlineDst = dstPitch / sizeof(uint16);
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uint16 *q = (uint16 *)dstPtr;
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while (height--) {
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for (int i = 0, j = 0; i < width; ++i, j += 2) {
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uint16 p1 = *(p + i);
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uint32 pi;
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pi = (((p1 & redblueMask) * 7) >> 3) & redblueMask;
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pi |= (((p1 & greenMask) * 7) >> 3) & greenMask;
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*(q + j) = p1;
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*(q + j + 1) = p1;
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*(q + j + nextlineDst) = (uint16)pi;
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*(q + j + nextlineDst + 1) = (uint16)pi;
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}
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p += nextlineSrc;
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q += nextlineDst << 1;
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}
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}
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MAKE_WRAPPER(TV2x)
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static inline uint16 DOT_16(uint16 c, int j, int i) {
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return c - ((c >> 2) & *(dotmatrix + ((j & 3) << 2) + (i & 3)));
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}
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// FIXME: This scaler doesn't quite work. Either it needs to know where on the
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// screen it's drawing, or the dirty rects will have to be adjusted so that
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// access to the dotmatrix array are made in a consistent way. (Doing that in
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// a way that also works together with aspect-ratio correction is left as an
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// exercise for the reader.)
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void DotMatrix(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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const uint32 nextlineSrc = srcPitch / sizeof(uint16);
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const uint16 *p = (const uint16 *)srcPtr;
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const uint32 nextlineDst = dstPitch / sizeof(uint16);
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uint16 *q = (uint16 *)dstPtr;
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for (int j = 0, jj = 0; j < height; ++j, jj += 2) {
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for (int i = 0, ii = 0; i < width; ++i, ii += 2) {
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uint16 c = *(p + i);
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*(q + ii) = DOT_16(c, jj, ii);
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*(q + ii + 1) = DOT_16(c, jj, ii + 1);
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*(q + ii + nextlineDst) = DOT_16(c, jj + 1, ii);
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*(q + ii + nextlineDst + 1) = DOT_16(c, jj + 1, ii + 1);
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}
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p += nextlineSrc;
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q += nextlineDst << 1;
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}
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}
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