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scummvm/common/scaler.cpp
Max Horn a7391d0a9a Rest of patch #774556 (small optimization for aspect ratio correction) 
svn-id: r9103
2003-07-21 00:07:27 +00:00

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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2003 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 "stdafx.h"
#include "scummsys.h"
#include "scaler.h"
// TODO: get rid of the colorMask etc. variables and instead use templates.
// This should give a respectable boost, since variable access (i.e. memory reads)
// in the innermost loops of our operations would work with constant data instead.
// That should help the inliner; reduce memory access; thus improve cache efficeny
// etc. The drawback will be that each scaler will exist twice, once for 555 and
// once for 555, resulting in the object file being twice as big (but thanks to
// templates, no source code would be duplicated.
static uint32 colorMask = 0xF7DEF7DE;
static uint32 lowPixelMask = 0x08210821;
static uint32 qcolorMask = 0xE79CE79C;
static uint32 qlowpixelMask = 0x18631863;
static uint32 redblueMask = 0xF81F;
static uint32 redMask = 0xF800;
static uint32 greenMask = 0x07E0;
static uint32 blueMask = 0x001F;
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;
int Init_2xSaI(uint32 BitFormat) {
if (BitFormat == 565) {
colorMask = 0xF7DEF7DE;
lowPixelMask = 0x08210821;
qcolorMask = 0xE79CE79C;
qlowpixelMask = 0x18631863;
redblueMask = 0xF81F;
redMask = 0xF800;
greenMask = 0x07E0;
blueMask = 0x001F;
dotmatrix = dotmatrix_565;
} else if (BitFormat == 555) {
colorMask = 0x7BDE7BDE;
lowPixelMask = 0x04210421;
qcolorMask = 0x739C739C;
qlowpixelMask = 0x0C630C63;
redblueMask = 0x7C1F;
redMask = 0x7C00;
greenMask = 0x03E0;
blueMask = 0x001F;
dotmatrix = dotmatrix_555;
} else {
return 0;
}
return 1;
}
static inline int GetResult(uint32 A, uint32 B, uint32 C, uint32 D) {
const bool ac = (A==C);
const bool bc = (B==C);
const int x1 = ac;
const int y1 = (bc & !ac);
const bool ad = (A==D);
const bool bd = (B==D);
const int x2 = ad;
const int y2 = (bd & !ad);
const int x = x1+x2;
const int y = y1+y2;
static const int rmap[3][3] = {
{0, 0, -1},
{0, 0, -1},
{1, 1, 0}
};
return rmap[y][x];
}
static inline uint32 INTERPOLATE(uint32 A, uint32 B) {
if (A != B) {
return (((A & colorMask) >> 1) + ((B & colorMask) >> 1) + (A & B & lowPixelMask));
} else
return A;
}
static inline uint32 Q_INTERPOLATE(uint32 A, uint32 B, uint32 C, uint32 D) {
register uint32 x = ((A & qcolorMask) >> 2) + ((B & qcolorMask) >> 2) + ((C & qcolorMask) >> 2) + ((D & qcolorMask) >> 2);
register uint32 y = ((A & qlowpixelMask) + (B & qlowpixelMask) + (C & qlowpixelMask) + (D & qlowpixelMask)) >> 2;
y &= qlowpixelMask;
return x + y;
}
void Super2xSaI(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
const uint16 *bP;
uint16 *dP;
const uint32 nextlineSrc = srcPitch >> 1;
while (height--) {
bP = (const uint16 *)srcPtr;
dP = (uint16 *)dstPtr;
for (int i = 0; i < width; ++i) {
uint32 color4, color5, color6;
uint32 color1, color2, color3;
uint32 colorA0, colorA1, colorA2, colorA3;
uint32 colorB0, colorB1, colorB2, colorB3;
uint32 colorS1, colorS2;
uint32 product1a, product1b, product2a, product2b;
//--------------------------------------- B1 B2
// 4 5 6 S2
// 1 2 3 S1
// A1 A2
colorB0 = *(bP - nextlineSrc - 1);
colorB1 = *(bP - nextlineSrc);
colorB2 = *(bP - nextlineSrc + 1);
colorB3 = *(bP - nextlineSrc + 2);
color4 = *(bP - 1);
color5 = *(bP);
color6 = *(bP + 1);
colorS2 = *(bP + 2);
color1 = *(bP + nextlineSrc - 1);
color2 = *(bP + nextlineSrc);
color3 = *(bP + nextlineSrc + 1);
colorS1 = *(bP + nextlineSrc + 2);
colorA0 = *(bP + 2 * nextlineSrc - 1);
colorA1 = *(bP + 2 * nextlineSrc);
colorA2 = *(bP + 2 * nextlineSrc + 1);
colorA3 = *(bP + 2 * nextlineSrc + 2);
//--------------------------------------
if (color2 == color6 && color5 != color3) {
product2b = product1b = color2;
} else if (color5 == color3 && color2 != color6) {
product2b = product1b = color5;
} else if (color5 == color3 && color2 == color6) {
register int r = 0;
r += GetResult(color6, color5, color1, colorA1);
r += GetResult(color6, color5, color4, colorB1);
r += GetResult(color6, color5, colorA2, colorS1);
r += GetResult(color6, color5, colorB2, colorS2);
if (r > 0)
product2b = product1b = color6;
else if (r < 0)
product2b = product1b = color5;
else {
product2b = product1b = INTERPOLATE(color5, color6);
}
} else {
if (color6 == color3 && color3 == colorA1 && color2 != colorA2 && color3 != colorA0)
product2b = Q_INTERPOLATE(color3, color3, color3, color2);
else if (color5 == color2 && color2 == colorA2 && colorA1 != color3 && color2 != colorA3)
product2b = Q_INTERPOLATE(color2, color2, color2, color3);
else
product2b = INTERPOLATE(color2, color3);
if (color6 == color3 && color6 == colorB1 && color5 != colorB2 && color6 != colorB0)
product1b = Q_INTERPOLATE(color6, color6, color6, color5);
else if (color5 == color2 && color5 == colorB2 && colorB1 != color6 && color5 != colorB3)
product1b = Q_INTERPOLATE(color6, color5, color5, color5);
else
product1b = INTERPOLATE(color5, color6);
}
if (color5 == color3 && color2 != color6 && color4 == color5 && color5 != colorA2)
product2a = INTERPOLATE(color2, color5);
else if (color5 == color1 && color6 == color5 && color4 != color2 && color5 != colorA0)
product2a = INTERPOLATE(color2, color5);
else
product2a = color2;
if (color2 == color6 && color5 != color3 && color1 == color2 && color2 != colorB2)
product1a = INTERPOLATE(color2, color5);
else if (color4 == color2 && color3 == color2 && color1 != color5 && color2 != colorB0)
product1a = INTERPOLATE(color2, color5);
else
product1a = color5;
*(dP + 0) = (uint16) product1a;
*(dP + 1) = (uint16) product1b;
*(dP + dstPitch/2 + 0) = (uint16) product2a;
*(dP + dstPitch/2 + 1) = (uint16) product2b;
bP += 1;
dP += 2;
}
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
}
}
void SuperEagle(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
const uint16 *bP;
uint16 *dP;
const uint32 nextlineSrc = srcPitch >> 1;
while (height--) {
bP = (const uint16 *)srcPtr;
dP = (uint16 *)dstPtr;
for (int i = 0; i < width; ++i) {
uint32 color4, color5, color6;
uint32 color1, color2, color3;
uint32 colorA1, colorA2, colorB1, colorB2, colorS1, colorS2;
uint32 product1a, product1b, product2a, product2b;
colorB1 = *(bP - nextlineSrc);
colorB2 = *(bP - nextlineSrc + 1);
color4 = *(bP - 1);
color5 = *(bP);
color6 = *(bP + 1);
colorS2 = *(bP + 2);
color1 = *(bP + nextlineSrc - 1);
color2 = *(bP + nextlineSrc);
color3 = *(bP + nextlineSrc + 1);
colorS1 = *(bP + nextlineSrc + 2);
colorA1 = *(bP + 2 * nextlineSrc);
colorA2 = *(bP + 2 * nextlineSrc + 1);
// --------------------------------------
if (color5 != color3)
{
if (color2 == color6)
{
product1b = product2a = color2;
if ((color1 == color2) || (color6 == colorB2)) {
product1a = INTERPOLATE(color2, color5);
product1a = INTERPOLATE(color2, product1a);
} else {
product1a = INTERPOLATE(color5, color6);
}
if ((color6 == colorS2) || (color2 == colorA1)) {
product2b = INTERPOLATE(color2, color3);
product2b = INTERPOLATE(color2, product2b);
} else {
product2b = INTERPOLATE(color2, color3);
}
}
else
{
product2b = product1a = INTERPOLATE(color2, color6);
product2b = Q_INTERPOLATE(color3, color3, color3, product2b);
product1a = Q_INTERPOLATE(color5, color5, color5, product1a);
product2a = product1b = INTERPOLATE(color5, color3);
product2a = Q_INTERPOLATE(color2, color2, color2, product2a);
product1b = Q_INTERPOLATE(color6, color6, color6, product1b);
}
}
else //if (color5 == color3)
{
if (color2 != color6)
{
product2b = product1a = color5;
if ((colorB1 == color5) || (color3 == colorS1)) {
product1b = INTERPOLATE(color5, color6);
product1b = INTERPOLATE(color5, product1b);
} else {
product1b = INTERPOLATE(color5, color6);
}
if ((color3 == colorA2) || (color4 == color5)) {
product2a = INTERPOLATE(color5, color2);
product2a = INTERPOLATE(color5, product2a);
} else {
product2a = INTERPOLATE(color2, color3);
}
}
else //if (color2 != color6)
{
register int r = 0;
r += GetResult(color6, color5, color1, colorA1);
r += GetResult(color6, color5, color4, colorB1);
r += GetResult(color6, color5, colorA2, colorS1);
r += GetResult(color6, color5, colorB2, colorS2);
if (r > 0) {
product1b = product2a = color2;
product1a = product2b = INTERPOLATE(color5, color6);
} else if (r < 0) {
product2b = product1a = color5;
product1b = product2a = INTERPOLATE(color5, color6);
} else {
product2b = product1a = color5;
product1b = product2a = color2;
}
}
}
*(dP + 0) = (uint16) product1a;
*(dP + 1) = (uint16) product1b;
*(dP + dstPitch/2 + 0) = (uint16) product2a;
*(dP + dstPitch/2 + 1) = (uint16) product2b;
bP += 1;
dP += 2;
}
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
}
}
void _2xSaI(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
const uint16 *bP;
uint16 *dP;
const uint32 nextlineSrc = srcPitch >> 1;
while (height--) {
bP = (const uint16 *)srcPtr;
dP = (uint16 *)dstPtr;
for (int i = 0; i < width; ++i) {
register uint32 colorA, colorB;
uint32 colorC, colorD,
colorE, colorF, colorG, colorH, colorI, colorJ, colorK, colorL, colorM, colorN, colorO, colorP;
uint32 product, product1, product2;
//---------------------------------------
// Map of the pixels: I|E F|J
// G|A B|K
// H|C D|L
// M|N O|P
colorI = *(bP - nextlineSrc - 1);
colorE = *(bP - nextlineSrc);
colorF = *(bP - nextlineSrc + 1);
colorJ = *(bP - nextlineSrc + 2);
colorG = *(bP - 1);
colorA = *(bP);
colorB = *(bP + 1);
colorK = *(bP + 2);
colorH = *(bP + nextlineSrc - 1);
colorC = *(bP + nextlineSrc);
colorD = *(bP + nextlineSrc + 1);
colorL = *(bP + nextlineSrc + 2);
colorM = *(bP + 2 * nextlineSrc - 1);
colorN = *(bP + 2 * nextlineSrc);
colorO = *(bP + 2 * nextlineSrc + 1);
colorP = *(bP + 2 * nextlineSrc + 2);
if ((colorA == colorD) && (colorB != colorC)) {
if (((colorA == colorE) && (colorB == colorL)) ||
((colorA == colorC) && (colorA == colorF) && (colorB != colorE) && (colorB == colorJ))) {
product = colorA;
} else {
product = INTERPOLATE(colorA, colorB);
}
if (((colorA == colorG) && (colorC == colorO)) ||
((colorA == colorB) && (colorA == colorH) && (colorG != colorC) && (colorC == colorM))) {
product1 = colorA;
} else {
product1 = INTERPOLATE(colorA, colorC);
}
product2 = colorA;
} else if ((colorB == colorC) && (colorA != colorD)) {
if (((colorB == colorF) && (colorA == colorH)) ||
((colorB == colorE) && (colorB == colorD) && (colorA != colorF) && (colorA == colorI))) {
product = colorB;
} else {
product = INTERPOLATE(colorA, colorB);
}
if (((colorC == colorH) && (colorA == colorF)) ||
((colorC == colorG) && (colorC == colorD) && (colorA != colorH) && (colorA == colorI))) {
product1 = colorC;
} else {
product1 = INTERPOLATE(colorA, colorC);
}
product2 = colorB;
} else if ((colorA == colorD) && (colorB == colorC)) {
if (colorA == colorB) {
product = colorA;
product1 = colorA;
product2 = colorA;
} else {
register int r = 0;
product1 = INTERPOLATE(colorA, colorC);
product = INTERPOLATE(colorA, colorB);
r += GetResult(colorA, colorB, colorG, colorE);
r -= GetResult(colorB, colorA, colorK, colorF);
r -= GetResult(colorB, colorA, colorH, colorN);
r += GetResult(colorA, colorB, colorL, colorO);
if (r > 0)
product2 = colorA;
else if (r < 0)
product2 = colorB;
else {
product2 = Q_INTERPOLATE(colorA, colorB, colorC, colorD);
}
}
} else {
product2 = Q_INTERPOLATE(colorA, colorB, colorC, colorD);
if ((colorA == colorC) && (colorA == colorF)
&& (colorB != colorE) && (colorB == colorJ)) {
product = colorA;
} else if ((colorB == colorE) && (colorB == colorD)
&& (colorA != colorF) && (colorA == colorI)) {
product = colorB;
} else {
product = INTERPOLATE(colorA, colorB);
}
if ((colorA == colorB) && (colorA == colorH)
&& (colorG != colorC) && (colorC == colorM)) {
product1 = colorA;
} else if ((colorC == colorG) && (colorC == colorD)
&& (colorA != colorH) && (colorA == colorI)) {
product1 = colorC;
} else {
product1 = INTERPOLATE(colorA, colorC);
}
}
*(dP + 0) = (uint16) colorA;
*(dP + 1) = (uint16) product;
*(dP + dstPitch/2 + 0) = (uint16) product1;
*(dP + dstPitch/2 + 1) = (uint16) product2;
bP += 1;
dP += 2;
}
srcPtr += srcPitch;
dstPtr += dstPitch * 2;
}
}
void AdvMame2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
unsigned int nextlineSrc = srcPitch / sizeof(uint16);
const uint16 *p = (const uint16 *)srcPtr;
unsigned int nextlineDst = dstPitch / sizeof(uint16);
uint16 *q = (uint16 *)dstPtr;
uint16 A, B, C;
uint16 D, E, F;
uint16 G, H, I;
while (height--) {
B = *(p - 1 - nextlineSrc);
E = *(p - 1);
H = *(p - 1 + nextlineSrc);
C = *(p - nextlineSrc);
F = *(p);
I = *(p + nextlineSrc);
for (int i = 0; i < width; ++i) {
p++;
A = B; B = C; C = *(p - nextlineSrc);
D = E; E = F; F = *(p);
G = H; H = I; I = *(p + nextlineSrc);
*(q) = D == B && B != F && D != H ? D : E;
*(q + 1) = B == F && B != D && F != H ? F : E;
*(q + nextlineDst) = D == H && D != B && H != F ? D : E;
*(q + nextlineDst + 1) = H == F && D != H && B != F ? F : E;
q += 2;
}
p += nextlineSrc - width;
q += (nextlineDst - width) << 1;
}
}
void AdvMame3x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
unsigned int nextlineSrc = srcPitch / sizeof(uint16);
const uint16 *p = (const uint16 *)srcPtr;
unsigned int nextlineDst = dstPitch / sizeof(uint16);
uint16 *q = (uint16 *)dstPtr;
uint16 A, B, C;
uint16 D, E, F;
uint16 G, H, I;
while (height--) {
B = *(p - 1 - nextlineSrc);
E = *(p - 1);
H = *(p - 1 + nextlineSrc);
C = *(p - nextlineSrc);
F = *(p);
I = *(p + nextlineSrc);
for (int i = 0; i < width; ++i) {
p++;
A = B; B = C; C = *(p - nextlineSrc);
D = E; E = F; F = *(p);
G = H; H = I; I = *(p + nextlineSrc);
*(q) = D == B && B != F && D != H ? D : E;
*(q + 1) = E;
*(q + 2) = B == F && B != D && F != H ? F : E;
*(q + nextlineDst) = E;
*(q + nextlineDst + 1) = E;
*(q + nextlineDst + 2) = E;
*(q + 2 * nextlineDst) = D == H && D != B && H != F ? D : E;
*(q + 2 * nextlineDst + 1) = E;
*(q + 2 * nextlineDst + 2) = H == F && D != H && B != F ? F : E;
q += 3;
}
p += nextlineSrc - width;
q += (nextlineDst - width) * 3;
}
}
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;
}
}
void Normal2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
uint8 *r;
while (height--) {
r = dstPtr;
for (int i = 0; i < width; ++i, r += 4) {
uint16 color = *(((const uint16 *)srcPtr) + i);
*(uint16 *)(r + 0) = color;
*(uint16 *)(r + 2) = color;
*(uint16 *)(r + 0 + dstPitch) = color;
*(uint16 *)(r + 2 + dstPitch) = color;
}
srcPtr += srcPitch;
dstPtr += dstPitch << 1;
}
}
void Normal3x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
uint8 *r;
uint32 dstPitch2 = dstPitch * 2;
uint32 dstPitch3 = dstPitch * 3;
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;
}
}
void TV2x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height) {
unsigned int nextlineSrc = srcPitch / sizeof(uint16);
const uint16 *p = (const uint16 *)srcPtr;
unsigned int 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;
}
}
static inline uint16 DOT_16(uint16 c, int j, int i) {
return c - ((c >> 2) & *(dotmatrix + ((j & 3) << 2) + (i & 3)));
}
void DotMatrix(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
int width, int height)
{
unsigned int nextlineSrc = srcPitch / sizeof(uint16);
const uint16 *p = (const uint16 *)srcPtr;
unsigned int 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;
}
}
#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 scale>
static inline uint16 interpolate5(uint16 A, uint16 B) {
uint16 r = (uint16)(((A & redMask) * scale + (B & redMask) * (5 - scale)) / 5);
uint16 g = (uint16)(((A & greenMask) * scale + (B & greenMask) * (5 - scale)) / 5);
uint16 b = (uint16)(((A & blueMask) * scale + (B & blueMask) * (5 - scale)) / 5);
return (uint16)((r & redMask) | (g & greenMask) | (b & blueMask));
}
template<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<scale>(*srcA++, *srcB++);
}
}
#endif
#if ASPECT_MODE == kFastAndNiceAspectMode
template<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 divisibl by 4)
// are really effective.
//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--) {
uint32 B = *sB++;
*d++ = Q_INTERPOLATE(*sA++, B, B, B);
}
} else {
while (width--) {
*d++ = INTERPOLATE(*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).
*/
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:
case 4:
interpolate5Line<1>((uint16 *)dstPtr, (const uint16 *)(srcPtr - pitch), (const uint16 *)srcPtr, width);
break;
case 2:
case 3:
interpolate5Line<2>((uint16 *)dstPtr, (const uint16 *)(srcPtr - pitch), (const uint16 *)srcPtr, width);
break;
}
#endif
dstPtr -= pitch;
}
return 1 + maxDstY - srcY;
}
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