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- update xBRZ upscaler to version 1.6

Browse source 
Fixed build with all suported toolchains thanks to incomplete implementation of C++14 in MSVC 2015 and GCC 4.9
Removed obsolete header comments and support for C++98
Disabled Windows only debug features

https://sourceforge.net/projects/xbrz/
https://sourceforge.net/projects/xbrz/files/xBRZ/xBRZ_1.6.zip
This commit is contained in:
alexey.lysiuk 2018-08-03 17:25:39 +03:00 committed by Rachael Alexanderson
parent d65d462268
commit 30c3f4f597
5 changed files with 559 additions and 284 deletions
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4
src/textures/hires/hqresize.cpp
View file

@ -285,13 +285,13 @@ static unsigned char *xbrzHelper( void (*xbrzFunction) ( size_t, const uint32_t*
parallel_for(inHeight, thresholdHeight, [=](int sliceY)
{
xbrzFunction(N, reinterpret_cast<uint32_t*>(inputBuffer), reinterpret_cast<uint32_t*>(newBuffer),
inWidth, inHeight, xbrz::ARGB, xbrz::ScalerCfg(), sliceY, sliceY + thresholdHeight);
inWidth, inHeight, xbrz::ColorFormat::ARGB, xbrz::ScalerCfg(), sliceY, sliceY + thresholdHeight);
});
}
else
{
xbrzFunction(N, reinterpret_cast<uint32_t*>(inputBuffer), reinterpret_cast<uint32_t*>(newBuffer),
inWidth, inHeight, xbrz::ARGB, xbrz::ScalerCfg(), 0, std::numeric_limits<int>::max());
inWidth, inHeight, xbrz::ColorFormat::ARGB, xbrz::ScalerCfg(), 0, std::numeric_limits<int>::max());
}
delete[] inputBuffer;

473
src/textures/hires/xbr/xbrz.cpp
View file

@ -1,63 +1,41 @@
// ****************************************************************************
// * This file is part of the HqMAME project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * This file is part of the xBRZ project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// * *
// * Additionally and as a special exception, the author gives permission *
// * to link the code of this program with the MAME library (or with modified *
// * versions of MAME that use the same license as MAME), and distribute *
// * linked combinations including the two. You must obey the GNU General *
// * Public License in all respects for all of the code used other than MAME. *
// * to link the code of this program with the following libraries *
// * (or with modified versions that use the same licenses), and distribute *
// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
// * You must obey the GNU General Public License in all respects for all of *
// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe. *
// * If you modify this file, you may extend this exception to your version *
// * of the file, but you are not obligated to do so. If you do not wish to *
// * do so, delete this exception statement from your version. *
// * *
// * An explicit permission was granted to use xBRZ in combination with ZDoom *
// * and derived projects as long as it is used for non-commercial purposes. *
// * *
// * Backported to C++98 by Alexey Lysiuk *
// ****************************************************************************
#include "xbrz.h"
#include <cassert>
#include <cmath>
#include <algorithm>
#include <vector>
#include <algorithm>
#include <cmath> //std::sqrt
#include "xbrz_tools.h"
using namespace xbrz;
#if __cplusplus <= 199711
#define static_assert(VAL, MSG) static_assertion<VAL>();
template<bool> struct static_assertion;
template<> struct static_assertion<true> {};
#endif // __cplusplus <= 199711
namespace
{
template <uint32_t N> inline
unsigned char getByte(uint32_t val) { return static_cast<unsigned char>((val >> (8 * N)) & 0xff); }
inline unsigned char getAlpha(uint32_t pix) { return getByte<3>(pix); }
inline unsigned char getRed (uint32_t pix) { return getByte<2>(pix); }
inline unsigned char getGreen(uint32_t pix) { return getByte<1>(pix); }
inline unsigned char getBlue (uint32_t pix) { return getByte<0>(pix); }
inline uint32_t makePixel( unsigned char r, unsigned char g, unsigned char b) { return (r << 16) | (g << 8) | b; }
inline uint32_t makePixel(unsigned char a, unsigned char r, unsigned char g, unsigned char b) { return (a << 24) | (r << 16) | (g << 8) | b; }
template <unsigned int M, unsigned int N> inline
uint32_t gradientRGB(uint32_t pixFront, uint32_t pixBack) //blend front color with opacity M / N over opaque background: http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
{
static_assert(0 < M && M < N && N <= 1000, "");
#define calcColor(colFront, colBack) \
(((colFront) * M + (colBack) * (N - M)) / N)
auto calcColor = [](unsigned char colFront, unsigned char colBack) -> unsigned char { return (colFront * M + colBack * (N - M)) / N; };
return makePixel(calcColor(getRed (pixFront), getRed (pixBack)),
calcColor(getGreen(pixFront), getGreen(pixBack)),
calcColor(getBlue (pixFront), getBlue (pixBack)));
#undef calcColor
}
@ -72,15 +50,15 @@ uint32_t gradientARGB(uint32_t pixFront, uint32_t pixBack) //find intermediate c
if (weightSum == 0)
return 0;
#define calcColor(colFront, colBack) \
static_cast<unsigned char>(((colFront) * weightFront + (colBack) * weightBack) / weightSum)
auto calcColor = [=](unsigned char colFront, unsigned char colBack)
{
return static_cast<unsigned char>((colFront * weightFront + colBack * weightBack) / weightSum);
};
return makePixel(static_cast<unsigned char>(weightSum / N),
calcColor(getRed (pixFront), getRed (pixBack)),
calcColor(getGreen(pixFront), getGreen(pixBack)),
calcColor(getBlue (pixFront), getBlue (pixBack)));
#undef calcColor
}
@ -96,26 +74,6 @@ uint32_t gradientARGB(uint32_t pixFront, uint32_t pixBack) //find intermediate c
//
uint32_t* byteAdvance( uint32_t* ptr, int bytes) { return reinterpret_cast< uint32_t*>(reinterpret_cast< char*>(ptr) + bytes); }
const uint32_t* byteAdvance(const uint32_t* ptr, int bytes) { return reinterpret_cast<const uint32_t*>(reinterpret_cast<const char*>(ptr) + bytes); }
//fill block with the given color
inline
void fillBlock(uint32_t* trg, int pitch, uint32_t col, int blockWidth, int blockHeight)
{
//for (int y = 0; y < blockHeight; ++y, trg = byteAdvance(trg, pitch))
// std::fill(trg, trg + blockWidth, col);
for (int y = 0; y < blockHeight; ++y, trg = byteAdvance(trg, pitch))
for (int x = 0; x < blockWidth; ++x)
trg[x] = col;
}
inline
void fillBlock(uint32_t* trg, int pitch, uint32_t col, int n) { fillBlock(trg, pitch, col, n, n); }
#ifdef _MSC_VER
#define FORCE_INLINE __forceinline
#elif defined __GNUC__
@ -178,7 +136,7 @@ template <class T> inline
T square(T value) { return value * value; }
#if 0
inline
double distRGB(uint32_t pix1, uint32_t pix2)
{
@ -189,6 +147,7 @@ double distRGB(uint32_t pix1, uint32_t pix2)
//euklidean RGB distance
return std::sqrt(square(r_diff) + square(g_diff) + square(b_diff));
}
#endif
inline
@ -218,26 +177,20 @@ double distYCbCr(uint32_t pix1, uint32_t pix2, double lumaWeight)
}
struct DistYCbCrBuffer //30% perf boost compared to distYCbCr()!
inline
double distYCbCrBuffered(uint32_t pix1, uint32_t pix2)
{
public:
static double dist(uint32_t pix1, uint32_t pix2)
//30% perf boost compared to plain distYCbCr()!
//consumes 64 MB memory; using double is only 2% faster, but takes 128 MB
static const std::vector<float> diffToDist = []
{
#if defined _MSC_VER && _MSC_VER < 1900
#error function scope static initialization is not yet thread-safe!
#endif
static const DistYCbCrBuffer inst;
return inst.distImpl(pix1, pix2);
}
std::vector<float> tmp;
private:
DistYCbCrBuffer() : buffer(256 * 256 * 256)
{
for (uint32_t i = 0; i < 256 * 256 * 256; ++i) //startup time: 114 ms on Intel Core i5 (four cores)
{
const int r_diff = getByte<2>(i) * 2 - 255;
const int g_diff = getByte<1>(i) * 2 - 255;
const int b_diff = getByte<0>(i) * 2 - 255;
const int r_diff = getByte<2>(i) * 2 - 0xFF;
const int g_diff = getByte<1>(i) * 2 - 0xFF;
const int b_diff = getByte<0>(i) * 2 - 0xFF;
const double k_b = 0.0593; //ITU-R BT.2020 conversion
const double k_r = 0.2627; //
@ -250,28 +203,31 @@ private:
const double c_b = scale_b * (b_diff - y);
const double c_r = scale_r * (r_diff - y);
buffer[i] = static_cast<float>(std::sqrt(square(y) + square(c_b) + square(c_r)));
tmp.push_back(static_cast<float>(std::sqrt(square(y) + square(c_b) + square(c_r))));
}
}
return tmp;
}();
double distImpl(uint32_t pix1, uint32_t pix2) const
{
//if (pix1 == pix2) -> 8% perf degradation!
// return 0;
//if (pix1 > pix2)
// std::swap(pix1, pix2); -> 30% perf degradation!!!
//if (pix1 == pix2) -> 8% perf degradation!
// return 0;
//if (pix1 < pix2)
// std::swap(pix1, pix2); -> 30% perf degradation!!!
#if 1
const int r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2);
const int g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2);
const int b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2);
const int r_diff = static_cast<int>(getRed (pix1)) - getRed (pix2);
const int g_diff = static_cast<int>(getGreen(pix1)) - getGreen(pix2);
const int b_diff = static_cast<int>(getBlue (pix1)) - getBlue (pix2);
return diffToDist[(((r_diff + 0xFF) / 2) << 16) | //slightly reduce precision (division by 2) to squeeze value into single byte
(((g_diff + 0xFF) / 2) << 8) |
(( b_diff + 0xFF) / 2)];
#else //not noticeably faster:
const int r_diff_tmp = ((pix1 & 0xFF0000) + 0xFF0000 - (pix2 & 0xFF0000)) / 2;
const int g_diff_tmp = ((pix1 & 0x00FF00) + 0x00FF00 - (pix2 & 0x00FF00)) / 2; //slightly reduce precision (division by 2) to squeeze value into single byte
const int b_diff_tmp = ((pix1 & 0x0000FF) + 0x0000FF - (pix2 & 0x0000FF)) / 2;
return buffer[(((r_diff + 255) / 2) << 16) | //slightly reduce precision (division by 2) to squeeze value into single byte
(((g_diff + 255) / 2) << 8) |
(( b_diff + 255) / 2)];
}
std::vector<float> buffer; //consumes 64 MB memory; using double is only 2% faster, but takes 128 MB
};
return diffToDist[(r_diff_tmp & 0xFF0000) | (g_diff_tmp & 0x00FF00) | (b_diff_tmp & 0x0000FF)];
#endif
}
enum BlendType
@ -323,15 +279,12 @@ BlendResult preProcessCorners(const Kernel_4x4& ker, const xbrz::ScalerCfg& cfg)
ker.g == ker.k))
return result;
#define dist(pix1, pix2) \
ColorDistance::dist((pix1), (pix2), cfg.luminanceWeight)
auto dist = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight); };
const int weight = 4;
double jg = dist(ker.i, ker.f) + dist(ker.f, ker.c) + dist(ker.n, ker.k) + dist(ker.k, ker.h) + weight * dist(ker.j, ker.g);
double fk = dist(ker.e, ker.j) + dist(ker.j, ker.o) + dist(ker.b, ker.g) + dist(ker.g, ker.l) + weight * dist(ker.f, ker.k);
#undef dist
if (jg < fk) //test sample: 70% of values max(jg, fk) / min(jg, fk) are between 1.1 and 3.7 with median being 1.8
{
const bool dominantGradient = cfg.dominantDirectionThreshold * jg < fk;
@ -383,12 +336,12 @@ DEF_GETTER(g, c) DEF_GETTER(h, b) DEF_GETTER(i, a)
#define DEF_GETTER(x, y) template <> inline uint32_t get_##x<ROT_270>(const Kernel_3x3& ker) { return ker.y; }
DEF_GETTER(a, c) DEF_GETTER(b, f) DEF_GETTER(c, i)
DEF_GETTER(d, b) DEF_GETTER(e, e) DEF_GETTER(f, h)
DEF_GETTER(g, a) DEF_GETTER(h, d) DEF_GETTER(i, g)
DEF_GETTER(g, a) DEF_GETTER(h, d) DEF_GETTER(i, g)
#undef DEF_GETTER
//compress four blend types into a single byte
inline BlendType getTopL (unsigned char b) { return static_cast<BlendType>(0x3 & b); }
//inline BlendType getTopL (unsigned char b) { return static_cast<BlendType>(0x3 & b); }
inline BlendType getTopR (unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 2)); }
inline BlendType getBottomR(unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 4)); }
inline BlendType getBottomL(unsigned char b) { return static_cast<BlendType>(0x3 & (b >> 6)); }
@ -407,6 +360,13 @@ template <> inline unsigned char rotateBlendInfo<ROT_180>(unsigned char b) { ret
template <> inline unsigned char rotateBlendInfo<ROT_270>(unsigned char b) { return ((b << 6) | (b >> 2)) & 0xff; }
#if 0 //#ifndef NDEBUG
int debugPixelX = -1;
int debugPixelY = 12;
__declspec(thread) bool breakIntoDebugger = false;
#endif
/*
input kernel area naming convention:
-------------
@ -434,40 +394,37 @@ void blendPixel(const Kernel_3x3& ker,
#define h get_h<rotDeg>(ker)
#define i get_i<rotDeg>(ker)
#if 0 //#ifndef NDEBUG
if (breakIntoDebugger)
__debugbreak(); //__asm int 3;
#endif
(void)a; //silence Clang's -Wunused-function
const unsigned char blend = rotateBlendInfo<rotDeg>(blendInfo);
if (getBottomR(blend) >= BLEND_NORMAL)
{
struct LineBlend
auto eq = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight) < cfg.equalColorTolerance; };
auto dist = [&](uint32_t pix1, uint32_t pix2) { return ColorDistance::dist(pix1, pix2, cfg.luminanceWeight); };
const bool doLineBlend = [&]() -> bool
{
static bool Eval(const Kernel_3x3& ker, const xbrz::ScalerCfg& cfg, const unsigned char blend)
{
if (getBottomR(blend) >= BLEND_DOMINANT)
return true;
#define eq(pix1, pix2) \
(ColorDistance::dist((pix1), (pix2), cfg.luminanceWeight) < cfg.equalColorTolerance)
//make sure there is no second blending in an adjacent rotation for this pixel: handles insular pixels, mario eyes
if (getTopR(blend) != BLEND_NONE && !eq(e, g)) //but support double-blending for 90 degree corners
return false;
if (getBottomL(blend) != BLEND_NONE && !eq(e, c))
return false;
//no full blending for L-shapes; blend corner only (handles "mario mushroom eyes")
if (!eq(e, i) && eq(g, h) && eq(h , i) && eq(i, f) && eq(f, c))
return false;
#undef eq
if (getBottomR(blend) >= BLEND_DOMINANT)
return true;
}
};
const bool doLineBlend = LineBlend::Eval(ker, cfg, blend);
//make sure there is no second blending in an adjacent rotation for this pixel: handles insular pixels, mario eyes
if (getTopR(blend) != BLEND_NONE && !eq(e, g)) //but support double-blending for 90° corners
return false;
if (getBottomL(blend) != BLEND_NONE && !eq(e, c))
return false;
#define dist(pix1, pix2) \
ColorDistance::dist((pix1), (pix2), cfg.luminanceWeight)
//no full blending for L-shapes; blend corner only (handles "mario mushroom eyes")
if (!eq(e, i) && eq(g, h) && eq(h, i) && eq(i, f) && eq(f, c))
return false;
return true;
}();
const uint32_t px = dist(e, f) <= dist(e, h) ? f : h; //choose most similar color
@ -493,15 +450,13 @@ void blendPixel(const Kernel_3x3& ker,
if (haveSteepLine)
Scaler::blendLineSteep(px, out);
else
Scaler::blendLineDiagonal(px,out);
Scaler::blendLineDiagonal(px, out);
}
}
else
Scaler::blendCorner(px, out);
}
#undef dist
#undef a
#undef b
#undef c
@ -528,7 +483,7 @@ void scaleImage(const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight,
//"sizeof(uint32_t) * srcWidth * (yLast - yFirst)" bytes without risk of accidental overwriting before accessing
const int bufferSize = srcWidth;
unsigned char* preProcBuffer = reinterpret_cast<unsigned char*>(trg + yLast * Scaler::scale * trgWidth) - bufferSize;
std::fill(preProcBuffer, preProcBuffer + bufferSize, 0);
std::fill(preProcBuffer, preProcBuffer + bufferSize, '\0');
static_assert(BLEND_NONE == 0, "");
//initialize preprocessing buffer for first row of current stripe: detect upper left and right corner blending
@ -599,6 +554,9 @@ void scaleImage(const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight,
for (int x = 0; x < srcWidth; ++x, out += Scaler::scale)
{
#if 0 //#ifndef NDEBUG
breakIntoDebugger = debugPixelX == x && debugPixelY == y;
#endif
//all those bounds checks have only insignificant impact on performance!
const int x_m1 = std::max(x - 1, 0); //perf: prefer array indexing to additional pointers!
const int x_p1 = std::min(x + 1, srcWidth - 1);
@ -652,7 +610,8 @@ void scaleImage(const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight,
}
//fill block of size scale * scale with the given color
fillBlock(out, trgWidth * sizeof(uint32_t), ker4.f, Scaler::scale); //place *after* preprocessing step, to not overwrite the results while processing the the last pixel!
fillBlock(out, trgWidth * sizeof(uint32_t), ker4.f, Scaler::scale, Scaler::scale);
//place *after* preprocessing step, to not overwrite the results while processing the the last pixel!
//blend four corners of current pixel
if (blendingNeeded(blend_xy)) //good 5% perf-improvement
@ -1047,7 +1006,7 @@ struct ColorDistanceRGB
{
static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
{
return DistYCbCrBuffer::dist(pix1, pix2);
return distYCbCrBuffered(pix1, pix2);
//if (pix1 == pix2) //about 4% perf boost
// return 0;
@ -1064,20 +1023,36 @@ struct ColorDistanceARGB
/*
Requirements for a color distance handling alpha channel: with a1, a2 in [0, 1]
1. if a1 = a2, distance should be: a1 * distYCbCr()
2. if a1 = 0, distance should be: a2 * distYCbCr(black, white) = a2 * 255
3. if a1 = 1, ??? maybe: 255 * (1 - a2) + a2 * distYCbCr()
1. if a1 = a2, distance should be: a1 * distYCbCr()
2. if a1 = 0, distance should be: a2 * distYCbCr(black, white) = a2 * 255
3. if a1 = 1, ??? maybe: 255 * (1 - a2) + a2 * distYCbCr()
*/
//return std::min(a1, a2) * DistYCbCrBuffer::dist(pix1, pix2) + 255 * abs(a1 - a2);
//return std::min(a1, a2) * distYCbCrBuffered(pix1, pix2) + 255 * abs(a1 - a2);
//=> following code is 15% faster:
const double d = DistYCbCrBuffer::dist(pix1, pix2);
const double d = distYCbCrBuffered(pix1, pix2);
if (a1 < a2)
return a1 * d + 255 * (a2 - a1);
else
return a2 * d + 255 * (a1 - a2);
//alternative? return std::sqrt(a1 * a2 * square(DistYCbCrBuffer::dist(pix1, pix2)) + square(255 * (a1 - a2)));
//alternative? return std::sqrt(a1 * a2 * square(distYCbCrBuffered(pix1, pix2)) + square(255 * (a1 - a2)));
}
};
struct ColorDistanceUnbufferedARGB
{
static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
{
const double a1 = getAlpha(pix1) / 255.0 ;
const double a2 = getAlpha(pix2) / 255.0 ;
const double d = distYCbCr(pix1, pix2, luminanceWeight);
if (a1 < a2)
return a1 * d + 255 * (a2 - a1);
else
return a2 * d + 255 * (a1 - a2);
}
};
@ -1104,9 +1079,26 @@ struct ColorGradientARGB
void xbrz::scale(size_t factor, const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight, ColorFormat colFmt, const xbrz::ScalerCfg& cfg, int yFirst, int yLast)
{
static_assert(SCALE_FACTOR_MAX == 6, "");
switch (colFmt)
{
case ARGB:
case ColorFormat::RGB:
switch (factor)
{
case 2:
return scaleImage<Scaler2x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 3:
return scaleImage<Scaler3x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 4:
return scaleImage<Scaler4x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 5:
return scaleImage<Scaler5x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 6:
return scaleImage<Scaler6x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
}
break;
case ColorFormat::ARGB:
switch (factor)
{
case 2:
@ -1122,19 +1114,19 @@ void xbrz::scale(size_t factor, const uint32_t* src, uint32_t* trg, int srcWidth
}
break;
case RGB:
case ColorFormat::ARGB_UNBUFFERED:
switch (factor)
{
case 2:
return scaleImage<Scaler2x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
return scaleImage<Scaler2x<ColorGradientARGB>, ColorDistanceUnbufferedARGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 3:
return scaleImage<Scaler3x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
return scaleImage<Scaler3x<ColorGradientARGB>, ColorDistanceUnbufferedARGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 4:
return scaleImage<Scaler4x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
return scaleImage<Scaler4x<ColorGradientARGB>, ColorDistanceUnbufferedARGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 5:
return scaleImage<Scaler5x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
return scaleImage<Scaler5x<ColorGradientARGB>, ColorDistanceUnbufferedARGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
case 6:
return scaleImage<Scaler6x<ColorGradientRGB>, ColorDistanceRGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
return scaleImage<Scaler6x<ColorGradientARGB>, ColorDistanceUnbufferedARGB>(src, trg, srcWidth, srcHeight, cfg, yFirst, yLast);
}
break;
}
@ -1146,84 +1138,133 @@ bool xbrz::equalColorTest(uint32_t col1, uint32_t col2, ColorFormat colFmt, doub
{
switch (colFmt)
{
case ARGB:
return ColorDistanceARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
case RGB:
case ColorFormat::RGB:
return ColorDistanceRGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
case ColorFormat::ARGB:
return ColorDistanceARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
case ColorFormat::ARGB_UNBUFFERED:
return ColorDistanceUnbufferedARGB::dist(col1, col2, luminanceWeight) < equalColorTolerance;
}
assert(false);
return false;
}
void xbrz::nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight, int srcPitch,
uint32_t* trg, int trgWidth, int trgHeight, int trgPitch,
SliceType st, int yFirst, int yLast)
void xbrz::bilinearScale(const uint32_t* src, int srcWidth, int srcHeight,
/**/ uint32_t* trg, int trgWidth, int trgHeight)
{
if (srcPitch < srcWidth * static_cast<int>(sizeof(uint32_t)) ||
trgPitch < trgWidth * static_cast<int>(sizeof(uint32_t)))
{
assert(false);
return;
}
switch (st)
{
case NN_SCALE_SLICE_SOURCE:
//nearest-neighbor (going over source image - fast for upscaling, since source is read only once
yFirst = std::max(yFirst, 0);
yLast = std::min(yLast, srcHeight);
if (yFirst >= yLast || trgWidth <= 0 || trgHeight <= 0) return;
for (int y = yFirst; y < yLast; ++y)
{
//mathematically: ySrc = floor(srcHeight * yTrg / trgHeight)
// => search for integers in: [ySrc, ySrc + 1) * trgHeight / srcHeight
//keep within for loop to support MT input slices!
const int yTrg_first = ( y * trgHeight + srcHeight - 1) / srcHeight; //=ceil(y * trgHeight / srcHeight)
const int yTrg_last = ((y + 1) * trgHeight + srcHeight - 1) / srcHeight; //=ceil(((y + 1) * trgHeight) / srcHeight)
const int blockHeight = yTrg_last - yTrg_first;
if (blockHeight > 0)
{
const uint32_t* srcLine = byteAdvance(src, y * srcPitch);
uint32_t* trgLine = byteAdvance(trg, yTrg_first * trgPitch);
int xTrg_first = 0;
for (int x = 0; x < srcWidth; ++x)
{
int xTrg_last = ((x + 1) * trgWidth + srcWidth - 1) / srcWidth;
const int blockWidth = xTrg_last - xTrg_first;
if (blockWidth > 0)
{
xTrg_first = xTrg_last;
fillBlock(trgLine, trgPitch, srcLine[x], blockWidth, blockHeight);
trgLine += blockWidth;
}
}
}
}
break;
case NN_SCALE_SLICE_TARGET:
//nearest-neighbor (going over target image - slow for upscaling, since source is read multiple times missing out on cache! Fast for similar image sizes!)
yFirst = std::max(yFirst, 0);
yLast = std::min(yLast, trgHeight);
if (yFirst >= yLast || srcHeight <= 0 || srcWidth <= 0) return;
for (int y = yFirst; y < yLast; ++y)
{
uint32_t* trgLine = byteAdvance(trg, y * trgPitch);
const int ySrc = srcHeight * y / trgHeight;
const uint32_t* srcLine = byteAdvance(src, ySrc * srcPitch);
for (int x = 0; x < trgWidth; ++x)
{
const int xSrc = srcWidth * x / trgWidth;
trgLine[x] = srcLine[xSrc];
}
}
break;
}
bilinearScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
0, trgHeight, [](uint32_t pix) { return pix; });
}
void xbrz::nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
/**/ uint32_t* trg, int trgWidth, int trgHeight)
{
nearestNeighborScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
0, trgHeight, [](uint32_t pix) { return pix; });
}
#if 0
//#include <ppl.h>
void bilinearScaleCpu(const uint32_t* src, int srcWidth, int srcHeight,
/**/ uint32_t* trg, int trgWidth, int trgHeight)
{
const int TASK_GRANULARITY = 16;
concurrency::task_group tg;
for (int i = 0; i < trgHeight; i += TASK_GRANULARITY)
tg.run([=]
{
const int iLast = std::min(i + TASK_GRANULARITY, trgHeight);
xbrz::bilinearScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
i, iLast, [](uint32_t pix) { return pix; });
});
tg.wait();
}
//Perf: AMP vs CPU: merely ~10% shorter runtime (scaling 1280x800 -> 1920x1080)
//#include <amp.h>
void bilinearScaleAmp(const uint32_t* src, int srcWidth, int srcHeight, //throw concurrency::runtime_exception
/**/ uint32_t* trg, int trgWidth, int trgHeight)
{
//C++ AMP reference: https://msdn.microsoft.com/en-us/library/hh289390.aspx
//introduction to C++ AMP: https://msdn.microsoft.com/en-us/magazine/hh882446.aspx
using namespace concurrency;
//TODO: pitch
if (srcHeight <= 0 || srcWidth <= 0) return;
const float scaleX = static_cast<float>(trgWidth ) / srcWidth;
const float scaleY = static_cast<float>(trgHeight) / srcHeight;
array_view<const uint32_t, 2> srcView(srcHeight, srcWidth, src);
array_view< uint32_t, 2> trgView(trgHeight, trgWidth, trg);
trgView.discard_data();
parallel_for_each(trgView.extent, [=](index<2> idx) restrict(amp) //throw ?
{
const int y = idx[0];
const int x = idx[1];
//Perf notes:
// -> float-based calculation is (almost 2x) faster than double!
// -> no noticeable improvement via tiling: https://msdn.microsoft.com/en-us/magazine/hh882447.aspx
// -> no noticeable improvement with restrict(amp,cpu)
// -> iterating over y-axis only is significantly slower!
// -> pre-calculating x,y-dependent variables in a buffer + array_view<> is ~ 20 % slower!
const int y1 = srcHeight * y / trgHeight;
int y2 = y1 + 1;
if (y2 == srcHeight) --y2;
const float yy1 = y / scaleY - y1;
const float y2y = 1 - yy1;
//-------------------------------------
const int x1 = srcWidth * x / trgWidth;
int x2 = x1 + 1;
if (x2 == srcWidth) --x2;
const float xx1 = x / scaleX - x1;
const float x2x = 1 - xx1;
//-------------------------------------
const float x2xy2y = x2x * y2y;
const float xx1y2y = xx1 * y2y;
const float x2xyy1 = x2x * yy1;
const float xx1yy1 = xx1 * yy1;
auto interpolate = [=](int offset)
{
/*
https://en.wikipedia.org/wiki/Bilinear_interpolation
(c11(x2 - x) + c21(x - x1)) * (y2 - y ) +
(c12(x2 - x) + c22(x - x1)) * (y - y1)
*/
const auto c11 = (srcView(y1, x1) >> (8 * offset)) & 0xff;
const auto c21 = (srcView(y1, x2) >> (8 * offset)) & 0xff;
const auto c12 = (srcView(y2, x1) >> (8 * offset)) & 0xff;
const auto c22 = (srcView(y2, x2) >> (8 * offset)) & 0xff;
return c11 * x2xy2y + c21 * xx1y2y +
c12 * x2xyy1 + c22 * xx1yy1;
};
const float bi = interpolate(0);
const float gi = interpolate(1);
const float ri = interpolate(2);
const float ai = interpolate(3);
const auto b = static_cast<uint32_t>(bi + 0.5f);
const auto g = static_cast<uint32_t>(gi + 0.5f);
const auto r = static_cast<uint32_t>(ri + 0.5f);
const auto a = static_cast<uint32_t>(ai + 0.5f);
trgView(y, x) = (a << 24) | (r << 16) | (g << 8) | b;
});
trgView.synchronize(); //throw ?
}
#endif

63
src/textures/hires/xbr/xbrz.h
View file

@ -1,28 +1,24 @@
// ****************************************************************************
// * This file is part of the HqMAME project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * This file is part of the xBRZ project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// * *
// * Additionally and as a special exception, the author gives permission *
// * to link the code of this program with the MAME library (or with modified *
// * versions of MAME that use the same license as MAME), and distribute *
// * linked combinations including the two. You must obey the GNU General *
// * Public License in all respects for all of the code used other than MAME. *
// * to link the code of this program with the following libraries *
// * (or with modified versions that use the same licenses), and distribute *
// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
// * You must obey the GNU General Public License in all respects for all of *
// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe. *
// * If you modify this file, you may extend this exception to your version *
// * of the file, but you are not obligated to do so. If you do not wish to *
// * do so, delete this exception statement from your version. *
// * *
// * An explicit permission was granted to use xBRZ in combination with ZDoom *
// * and derived projects as long as it is used for non-commercial purposes. *
// * *
// * Backported to C++98 by Alexey Lysiuk *
// ****************************************************************************
#ifndef XBRZ_HEADER_3847894708239054
#define XBRZ_HEADER_3847894708239054
#include <cstddef> //size_t
#include <stdint.h> //uint32_t
#include <cstdint> //uint32_t
#include <limits>
#include "xbrz_config.h"
@ -43,60 +39,41 @@ http://board.byuu.org/viewtopic.php?f=10&t=2248
- support scaling up to 6xBRZ
*/
enum ColorFormat //from high bits -> low bits, 8 bit per channel
enum class ColorFormat //from high bits -> low bits, 8 bit per channel
{
RGB, //8 bit for each red, green, blue, upper 8 bits unused
ARGB, //including alpha channel, BGRA byte order on little-endian machines
ARGB_UNBUFFERED, //like ARGB, but without the one-time buffer creation overhead (ca. 100 - 300 ms) at the expense of a slightly slower scaling time
};
const int SCALE_FACTOR_MAX = 6;
/*
-> map source (srcWidth * srcHeight) to target (scale * width x scale * height) image, optionally processing a half-open slice of rows [yFirst, yLast) only
-> support for source/target pitch in bytes!
-> if your emulator changes only a few image slices during each cycle (e.g. DOSBox) then there's no need to run xBRZ on the complete image:
Just make sure you enlarge the source image slice by 2 rows on top and 2 on bottom (this is the additional range the xBRZ algorithm is using during analysis)
Caveat: If there are multiple changed slices, make sure they do not overlap after adding these additional rows in order to avoid a memory race condition
CAVEAT: If there are multiple changed slices, make sure they do not overlap after adding these additional rows in order to avoid a memory race condition
in the target image data if you are using multiple threads for processing each enlarged slice!
THREAD-SAFETY: - parts of the same image may be scaled by multiple threads as long as the [yFirst, yLast) ranges do not overlap!
- there is a minor inefficiency for the first row of a slice, so avoid processing single rows only; suggestion: process 8-16 rows at least
- there is a minor inefficiency for the first row of a slice, so avoid processing single rows only; suggestion: process at least 8-16 rows
*/
#ifdef max
#undef max
#endif
void scale(size_t factor, //valid range: 2 - 6
void scale(size_t factor, //valid range: 2 - SCALE_FACTOR_MAX
const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight,
ColorFormat colFmt,
const ScalerCfg& cfg = ScalerCfg(),
int yFirst = 0, int yLast = std::numeric_limits<int>::max()); //slice of source image
void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
uint32_t* trg, int trgWidth, int trgHeight);
void bilinearScale(const uint32_t* src, int srcWidth, int srcHeight,
/**/ uint32_t* trg, int trgWidth, int trgHeight);
void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
/**/ uint32_t* trg, int trgWidth, int trgHeight);
enum SliceType
{
NN_SCALE_SLICE_SOURCE,
NN_SCALE_SLICE_TARGET,
};
void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight, int srcPitch, //pitch in bytes!
uint32_t* trg, int trgWidth, int trgHeight, int trgPitch,
SliceType st, int yFirst, int yLast);
//parameter tuning
bool equalColorTest(uint32_t col1, uint32_t col2, ColorFormat colFmt, double luminanceWeight, double equalColorTolerance);
//########################### implementation ###########################
inline
void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
uint32_t* trg, int trgWidth, int trgHeight)
{
nearestNeighborScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
NN_SCALE_SLICE_TARGET, 0, trgHeight);
}
}
#endif

35
src/textures/hires/xbr/xbrz_config.h
View file

@ -1,21 +1,17 @@
// ****************************************************************************
// * This file is part of the HqMAME project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * This file is part of the xBRZ project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// * *
// * Additionally and as a special exception, the author gives permission *
// * to link the code of this program with the MAME library (or with modified *
// * versions of MAME that use the same license as MAME), and distribute *
// * linked combinations including the two. You must obey the GNU General *
// * Public License in all respects for all of the code used other than MAME. *
// * to link the code of this program with the following libraries *
// * (or with modified versions that use the same licenses), and distribute *
// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
// * You must obey the GNU General Public License in all respects for all of *
// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe. *
// * If you modify this file, you may extend this exception to your version *
// * of the file, but you are not obligated to do so. If you do not wish to *
// * do so, delete this exception statement from your version. *
// * *
// * An explicit permission was granted to use xBRZ in combination with ZDoom *
// * and derived projects as long as it is used for non-commercial purposes. *
// * *
// * Backported to C++98 by Alexey Lysiuk *
// ****************************************************************************
#ifndef XBRZ_CONFIG_HEADER_284578425345
@ -27,18 +23,11 @@ namespace xbrz
{
struct ScalerCfg
{
ScalerCfg() :
luminanceWeight(1),
equalColorTolerance(30),
dominantDirectionThreshold(3.6),
steepDirectionThreshold(2.2),
newTestAttribute(0) {}
double luminanceWeight;
double equalColorTolerance;
double dominantDirectionThreshold;
double steepDirectionThreshold;
double newTestAttribute; //unused; test new parameters
double luminanceWeight = 1;
double equalColorTolerance = 30;
double dominantDirectionThreshold = 3.6;
double steepDirectionThreshold = 2.2;
double newTestAttribute = 0; //unused; test new parameters
};
}

268
src/textures/hires/xbr/xbrz_tools.h Normal file
View file

@ -0,0 +1,268 @@
// ****************************************************************************
// * This file is part of the xBRZ project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// * *
// * Additionally and as a special exception, the author gives permission *
// * to link the code of this program with the following libraries *
// * (or with modified versions that use the same licenses), and distribute *
// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
// * You must obey the GNU General Public License in all respects for all of *
// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe. *
// * If you modify this file, you may extend this exception to your version *
// * of the file, but you are not obligated to do so. If you do not wish to *
// * do so, delete this exception statement from your version. *
// ****************************************************************************
#ifndef XBRZ_TOOLS_H_825480175091875
#define XBRZ_TOOLS_H_825480175091875
#include <cassert>
#include <algorithm>
#include <type_traits>
namespace xbrz
{
template <uint32_t N> inline
unsigned char getByte(uint32_t val) { return static_cast<unsigned char>((val >> (8 * N)) & 0xff); }
inline unsigned char getAlpha(uint32_t pix) { return getByte<3>(pix); }
inline unsigned char getRed (uint32_t pix) { return getByte<2>(pix); }
inline unsigned char getGreen(uint32_t pix) { return getByte<1>(pix); }
inline unsigned char getBlue (uint32_t pix) { return getByte<0>(pix); }
inline uint32_t makePixel(unsigned char a, unsigned char r, unsigned char g, unsigned char b) { return (a << 24) | (r << 16) | (g << 8) | b; }
inline uint32_t makePixel( unsigned char r, unsigned char g, unsigned char b) { return (r << 16) | (g << 8) | b; }
inline uint32_t rgb555to888(uint16_t pix) { return ((pix & 0x7C00) << 9) | ((pix & 0x03E0) << 6) | ((pix & 0x001F) << 3); }
inline uint32_t rgb565to888(uint16_t pix) { return ((pix & 0xF800) << 8) | ((pix & 0x07E0) << 5) | ((pix & 0x001F) << 3); }
inline uint16_t rgb888to555(uint32_t pix) { return static_cast<uint16_t>(((pix & 0xF80000) >> 9) | ((pix & 0x00F800) >> 6) | ((pix & 0x0000F8) >> 3)); }
inline uint16_t rgb888to565(uint32_t pix) { return static_cast<uint16_t>(((pix & 0xF80000) >> 8) | ((pix & 0x00FC00) >> 5) | ((pix & 0x0000F8) >> 3)); }
template <class Pix> inline
Pix* byteAdvance(Pix* ptr, int bytes)
{
using PixNonConst = typename std::remove_cv<Pix>::type;
using PixByte = typename std::conditional<std::is_same<Pix, PixNonConst>::value, char, const char>::type;
static_assert(std::is_integral<PixNonConst>::value, "Pix* is expected to be cast-able to char*");
return reinterpret_cast<Pix*>(reinterpret_cast<PixByte*>(ptr) + bytes);
}
//fill block with the given color
template <class Pix> inline
void fillBlock(Pix* trg, int pitch, Pix col, int blockWidth, int blockHeight)
{
//for (int y = 0; y < blockHeight; ++y, trg = byteAdvance(trg, pitch))
// std::fill(trg, trg + blockWidth, col);
for (int y = 0; y < blockHeight; ++y, trg = byteAdvance(trg, pitch))
for (int x = 0; x < blockWidth; ++x)
trg[x] = col;
}
//nearest-neighbor (going over target image - slow for upscaling, since source is read multiple times missing out on cache! Fast for similar image sizes!)
template <class PixSrc, class PixTrg, class PixConverter>
void nearestNeighborScale(const PixSrc* src, int srcWidth, int srcHeight, int srcPitch,
/**/ PixTrg* trg, int trgWidth, int trgHeight, int trgPitch,
int yFirst, int yLast, PixConverter pixCvrt /*convert PixSrc to PixTrg*/)
{
static_assert(std::is_integral<PixSrc>::value, "PixSrc* is expected to be cast-able to char*");
static_assert(std::is_integral<PixTrg>::value, "PixTrg* is expected to be cast-able to char*");
static_assert(std::is_same<decltype(pixCvrt(PixSrc())), PixTrg>::value, "PixConverter returning wrong pixel format");
if (srcPitch < srcWidth * static_cast<int>(sizeof(PixSrc)) ||
trgPitch < trgWidth * static_cast<int>(sizeof(PixTrg)))
{
assert(false);
return;
}
yFirst = std::max(yFirst, 0);
yLast = std::min(yLast, trgHeight);
if (yFirst >= yLast || srcHeight <= 0 || srcWidth <= 0) return;
for (int y = yFirst; y < yLast; ++y)
{
const int ySrc = srcHeight * y / trgHeight;
const PixSrc* const srcLine = byteAdvance(src, ySrc * srcPitch);
PixTrg* const trgLine = byteAdvance(trg, y * trgPitch);
for (int x = 0; x < trgWidth; ++x)
{
const int xSrc = srcWidth * x / trgWidth;
trgLine[x] = pixCvrt(srcLine[xSrc]);
}
}
}
//nearest-neighbor (going over source image - fast for upscaling, since source is read only once
template <class PixSrc, class PixTrg, class PixConverter>
void nearestNeighborScaleOverSource(const PixSrc* src, int srcWidth, int srcHeight, int srcPitch,
/**/ PixTrg* trg, int trgWidth, int trgHeight, int trgPitch,
int yFirst, int yLast, PixConverter pixCvrt /*convert PixSrc to PixTrg*/)
{
static_assert(std::is_integral<PixSrc>::value, "PixSrc* is expected to be cast-able to char*");
static_assert(std::is_integral<PixTrg>::value, "PixTrg* is expected to be cast-able to char*");
static_assert(std::is_same<decltype(pixCvrt(PixSrc())), PixTrg>::value, "PixConverter returning wrong pixel format");
if (srcPitch < srcWidth * static_cast<int>(sizeof(PixSrc)) ||
trgPitch < trgWidth * static_cast<int>(sizeof(PixTrg)))
{
assert(false);
return;
}
yFirst = std::max(yFirst, 0);
yLast = std::min(yLast, srcHeight);
if (yFirst >= yLast || trgWidth <= 0 || trgHeight <= 0) return;
for (int y = yFirst; y < yLast; ++y)
{
//mathematically: ySrc = floor(srcHeight * yTrg / trgHeight)
// => search for integers in: [ySrc, ySrc + 1) * trgHeight / srcHeight
//keep within for loop to support MT input slices!
const int yTrgFirst = ( y * trgHeight + srcHeight - 1) / srcHeight; //=ceil(y * trgHeight / srcHeight)
const int yTrgLast = ((y + 1) * trgHeight + srcHeight - 1) / srcHeight; //=ceil(((y + 1) * trgHeight) / srcHeight)
const int blockHeight = yTrgLast - yTrgFirst;
if (blockHeight > 0)
{
const PixSrc* srcLine = byteAdvance(src, y * srcPitch);
/**/ PixTrg* trgLine = byteAdvance(trg, yTrgFirst * trgPitch);
int xTrgFirst = 0;
for (int x = 0; x < srcWidth; ++x)
{
const int xTrgLast = ((x + 1) * trgWidth + srcWidth - 1) / srcWidth;
const int blockWidth = xTrgLast - xTrgFirst;
if (blockWidth > 0)
{
xTrgFirst = xTrgLast;
const auto trgPix = pixCvrt(srcLine[x]);
fillBlock(trgLine, trgPitch, trgPix, blockWidth, blockHeight);
trgLine += blockWidth;
}
}
}
}
}
template <class PixTrg, class PixConverter>
void bilinearScale(const uint32_t* src, int srcWidth, int srcHeight, int srcPitch,
/**/ PixTrg* trg, int trgWidth, int trgHeight, int trgPitch,
int yFirst, int yLast, PixConverter pixCvrt /*convert uint32_t to PixTrg*/)
{
static_assert(std::is_integral<PixTrg>::value, "PixTrg* is expected to be cast-able to char*");
static_assert(std::is_same<decltype(pixCvrt(uint32_t())), PixTrg>::value, "PixConverter returning wrong pixel format");
if (srcPitch < srcWidth * static_cast<int>(sizeof(uint32_t)) ||
trgPitch < trgWidth * static_cast<int>(sizeof(PixTrg)))
{
assert(false);
return;
}
yFirst = std::max(yFirst, 0);
yLast = std::min(yLast, trgHeight);
if (yFirst >= yLast || srcHeight <= 0 || srcWidth <= 0) return;
const double scaleX = static_cast<double>(trgWidth ) / srcWidth;
const double scaleY = static_cast<double>(trgHeight) / srcHeight;
//perf notes:
// -> double-based calculation is (slightly) faster than float
// -> precalculation gives significant boost; std::vector<> memory allocation is negligible!
struct CoeffsX
{
int x1;
int x2;
double xx1;
double x2x;
};
std::vector<CoeffsX> buf(trgWidth);
for (int x = 0; x < trgWidth; ++x)
{
const int x1 = srcWidth * x / trgWidth;
int x2 = x1 + 1;
if (x2 == srcWidth) --x2;
const double xx1 = x / scaleX - x1;
const double x2x = 1 - xx1;
buf[x] = { x1, x2, xx1, x2x };
}
for (int y = yFirst; y < yLast; ++y)
{
const int y1 = srcHeight * y / trgHeight;
int y2 = y1 + 1;
if (y2 == srcHeight) --y2;
const double yy1 = y / scaleY - y1;
const double y2y = 1 - yy1;
const uint32_t* const srcLine = byteAdvance(src, y1 * srcPitch);
const uint32_t* const srcLineNext = byteAdvance(src, y2 * srcPitch);
PixTrg* const trgLine = byteAdvance(trg, y * trgPitch);
for (int x = 0; x < trgWidth; ++x)
{
//perf: do NOT "simplify" the variable layout without measurement!
const int x1 = buf[x].x1;
const int x2 = buf[x].x2;
const double xx1 = buf[x].xx1;
const double x2x = buf[x].x2x;
const double x2xy2y = x2x * y2y;
const double xx1y2y = xx1 * y2y;
const double x2xyy1 = x2x * yy1;
const double xx1yy1 = xx1 * yy1;
auto interpolate = [=](int offset)
{
/*
https://en.wikipedia.org/wiki/Bilinear_interpolation
(c11(x2 - x) + c21(x - x1)) * (y2 - y ) +
(c12(x2 - x) + c22(x - x1)) * (y - y1)
*/
const auto c11 = (srcLine [x1] >> (8 * offset)) & 0xff;
const auto c21 = (srcLine [x2] >> (8 * offset)) & 0xff;
const auto c12 = (srcLineNext[x1] >> (8 * offset)) & 0xff;
const auto c22 = (srcLineNext[x2] >> (8 * offset)) & 0xff;
return c11 * x2xy2y + c21 * xx1y2y +
c12 * x2xyy1 + c22 * xx1yy1;
};
const double bi = interpolate(0);
const double gi = interpolate(1);
const double ri = interpolate(2);
const double ai = interpolate(3);
const auto b = static_cast<uint32_t>(bi + 0.5);
const auto g = static_cast<uint32_t>(gi + 0.5);
const auto r = static_cast<uint32_t>(ri + 0.5);
const auto a = static_cast<uint32_t>(ai + 0.5);
const uint32_t trgPix = (a << 24) | (r << 16) | (g << 8) | b;
trgLine[x] = pixCvrt(trgPix);
}
}
}
}
#endif //XBRZ_TOOLS_H_825480175091875