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Diffstat (limited to 'common/scaler/aspect.cpp')
| -rw-r--r-- | common/scaler/aspect.cpp | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/common/scaler/aspect.cpp b/common/scaler/aspect.cpp deleted file mode 100644 index 6e55236850..0000000000 --- a/common/scaler/aspect.cpp +++ /dev/null @@ -1,196 +0,0 @@ -/* ScummVM - Scumm Interpreter - * Copyright (C) 2001 Ludvig Strigeus - * Copyright (C) 2001-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - * - * $URL$ - * $Id$ - * - */ - -#include "common/scaler/intern.h" -#include "common/scaler.h" - - -#define kVeryFastAndUglyAspectMode 0 // No interpolation at all, but super-fast -#define kFastAndNiceAspectMode 1 // Quite good quality with good speed -#define kSlowAndPerfectAspectMode 2 // Accurate but slow code - -#define ASPECT_MODE kFastAndNiceAspectMode - - -#if ASPECT_MODE == kSlowAndPerfectAspectMode - -template<int bitFormat, int scale> -static inline uint16 interpolate5(uint16 A, uint16 B) { - uint16 r = (uint16)(((A & redblueMask & 0xFF00) * scale + (B & redblueMask & 0xFF00) * (5 - scale)) / 5); - uint16 g = (uint16)(((A & greenMask) * scale + (B & greenMask) * (5 - scale)) / 5); - uint16 b = (uint16)(((A & redblueMask & 0x00FF) * scale + (B & redblueMask & 0x00FF) * (5 - scale)) / 5); - - return (uint16)((r & redblueMask & 0xFF00) | (g & greenMask) | (b & redblueMask & 0x00FF)); -} - - -template<int bitFormat, int scale> -static inline void interpolate5Line(uint16 *dst, const uint16 *srcA, const uint16 *srcB, int width) { - // Accurate but slightly slower code - while (width--) { - *dst++ = interpolate5<bitFormat, scale>(*srcA++, *srcB++); - } -} -#endif - -#if ASPECT_MODE == kFastAndNiceAspectMode - -template<int bitFormat> -static inline uint32 INTERPOLATE_1_1(uint32 A, uint32 B) { - return (((A & highBits) >> 1) + ((B & highBits) >> 1) + (A & B & lowBits)); -} - -template<int bitFormat> -static inline uint32 INTERPOLATE_1_3(uint32 A, uint32 B) { - register uint32 x = ((A & qhighBits) >> 2) + ((B & qhighBits) >> 2) * 3; - register uint32 y = ((A & qlowBits) + (B & qlowBits) * 3) >> 2; - - y &= qlowBits; - return x + y; -} - -template<int bitFormat, int scale> -static inline void interpolate5Line(uint16 *dst, const uint16 *srcA, const uint16 *srcB, int width) { - // For efficiency reasons we blit two pixels at a time, so it is important - // that makeRectStretchable() guarantees that the width is even and that - // the rect starts on a well-aligned address. (Even where unaligned memory - // access is allowed there may be a speed penalty for it.) - - // These asserts are disabled for maximal speed; but I leave them in here - // in case other people want to test if the memory alignment (to an - // address divisible by 4) is really working properly. - //assert(((int)dst & 3) == 0); - //assert(((int)srcA & 3) == 0); - //assert(((int)srcB & 3) == 0); - //assert((width & 1) == 0); - - width /= 2; - const uint32 *sA = (const uint32 *)srcA; - const uint32 *sB = (const uint32 *)srcB; - uint32 *d = (uint32 *)dst; - if (scale == 1) { - while (width--) { - *d++ = INTERPOLATE_1_3<bitFormat>(*sA++, *sB++); - } - } else { - while (width--) { - *d++ = INTERPOLATE_1_1<bitFormat>(*sA++, *sB++); - } - } -} -#endif - -void makeRectStretchable(int &x, int &y, int &w, int &h) { -#if ASPECT_MODE != kVeryFastAndUglyAspectMode - int m = real2Aspect(y) % 6; - - // Ensure that the rect will start on a line that won't have its - // colours changed by the stretching function. - if (m != 0 && m != 5) { - y -= m; - h += m; - } - - #if ASPECT_MODE == kFastAndNiceAspectMode - // Force x to be even, to ensure aligned memory access (this assumes - // that each line starts at an even memory location, but that should - // be the case on every target anyway). - if (x & 1) { - x--; - w++; - } - - // Finally force the width to be even, since we blit 2 pixels at a time. - // While this means we may sometimes blit one column more than necessary, - // this should actually be faster than having the check for the - if (w & 1) - w++; - #endif -#endif -} - -/** - * Stretch a 16bpp image vertically by factor 1.2. Used to correct the - * aspect-ratio in games using 320x200 pixel graphics with non-qudratic - * pixels. Applying this method effectively turns that into 320x240, which - * provides the correct aspect-ratio on modern displays. - * - * The image would normally have occupied y coordinates origSrcY through - * origSrcY + height - 1. - * - * However, we have already placed it at srcY - the aspect-corrected y - * coordinate - to allow in-place stretching. - * - * Therefore, the source image now occupies Y coordinates srcY through - * srcY + height - 1, and it should be stretched to Y coordinates srcY - * through real2Aspect(srcY + height - 1). - */ -template<int bitFormat> -int stretch200To240(uint8 *buf, uint32 pitch, int width, int height, int srcX, int srcY, int origSrcY) { - int maxDstY = real2Aspect(origSrcY + height - 1); - int y; - const uint8 *startSrcPtr = buf + srcX * 2 + (srcY - origSrcY) * pitch; - uint8 *dstPtr = buf + srcX * 2 + maxDstY * pitch; - - for (y = maxDstY; y >= srcY; y--) { - const uint8 *srcPtr = startSrcPtr + aspect2Real(y) * pitch; - -#if ASPECT_MODE == kVeryFastAndUglyAspectMode - if (srcPtr == dstPtr) - break; - memcpy(dstPtr, srcPtr, width * 2); -#else - // Bilinear filter - switch (y % 6) { - case 0: - case 5: - if (srcPtr != dstPtr) - memcpy(dstPtr, srcPtr, width * 2); - break; - case 1: - interpolate5Line<bitFormat, 1>((uint16 *)dstPtr, (const uint16 *)(srcPtr - pitch), (const uint16 *)srcPtr, width); - break; - case 2: - interpolate5Line<bitFormat, 2>((uint16 *)dstPtr, (const uint16 *)(srcPtr - pitch), (const uint16 *)srcPtr, width); - break; - case 3: - interpolate5Line<bitFormat, 2>((uint16 *)dstPtr, (const uint16 *)srcPtr, (const uint16 *)(srcPtr - pitch), width); - break; - case 4: - interpolate5Line<bitFormat, 1>((uint16 *)dstPtr, (const uint16 *)srcPtr, (const uint16 *)(srcPtr - pitch), width); - break; - } -#endif - dstPtr -= pitch; - } - - return 1 + maxDstY - srcY; -} - -int stretch200To240(uint8 *buf, uint32 pitch, int width, int height, int srcX, int srcY, int origSrcY) { - if (gBitFormat == 565) - return stretch200To240<565>(buf, pitch, width, height, srcX, srcY, origSrcY); - else // gBitFormat == 555 - return stretch200To240<555>(buf, pitch, width, height, srcX, srcY, origSrcY); -} - |