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https://github.com/libretro/scummvm.git
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aa33153569
except essential Normal1x. Also thumbnails get compiled unconditionally so we get them on all platforms, even those which never display them. Sorted out mess brought to sdl backend by epoc maintainer. He misused __SYMBIAN32__ where DISABLE_SCALERS is more appropriate. svn-id: r18850
322 lines
9.5 KiB
C++
322 lines
9.5 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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#ifndef DISABLE_SCALERS
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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(((long)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(((long)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(((long)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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#endif
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