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Diffstat (limited to 'src/imageutils/scale.cpp')
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diff --git a/src/imageutils/scale.cpp b/src/imageutils/scale.cpp new file mode 100644 index 0000000..99ed186 --- /dev/null +++ b/src/imageutils/scale.cpp @@ -0,0 +1,1979 @@ +// This file includes code for scaling images, in two versions. +// One ported from ImageMagick (slower, but can achieve better quality), +// and from Imlib2 ported by Mosfet (very fast). + + +// ImageMagick code begin +// ---------------------- + +// This code is ImageMagick's resize code, adapted for QImage, with +// fastfloat class added as an optimization. +// The original license text follows. + +/* +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% % +% % +% RRRR EEEEE SSSSS IIIII ZZZZZ EEEEE % +% R R E SS I ZZ E % +% RRRR EEE SSS I ZZZ EEE % +% R R E SS I ZZ E % +% R R EEEEE SSSSS IIIII ZZZZZ EEEEE % +% % +% ImageMagick Image Resize Methods % +% % +% % +% Software Design % +% John Cristy % +% July 1992 % +% % +% % +% Copyright (C) 2003 ImageMagick Studio, a non-profit organization dedicated % +% to making software imaging solutions freely available. % +% % +% Permission is hereby granted, free of charge, to any person obtaining a % +% copy of this software and associated documentation files ("ImageMagick"), % +% to deal in ImageMagick without restriction, including without limitation % +% the rights to use, copy, modify, merge, publish, distribute, sublicense, % +% and/or sell copies of ImageMagick, and to permit persons to whom the % +% ImageMagick is furnished to do so, subject to the following conditions: % +% % +% The above copyright notice and this permission notice shall be included in % +% all copies or substantial portions of ImageMagick. % +% % +% The software is provided "as is", without warranty of any kind, express or % +% implied, including but not limited to the warranties of merchantability, % +% fitness for a particular purpose and noninfringement. In no event shall % +% ImageMagick Studio be liable for any claim, damages or other liability, % +% whether in an action of contract, tort or otherwise, arising from, out of % +% or in connection with ImageMagick or the use or other dealings in % +% ImageMagick. % +% % +% Except as contained in this notice, the name of the ImageMagick Studio % +% shall not be used in advertising or otherwise to promote the sale, use or % +% other dealings in ImageMagick without prior written authorization from the % +% ImageMagick Studio. % +% % +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% +% +*/ +#include "config.h" + +// System +#ifdef HAVE_ENDIAN_H +#include <endian.h> +#else +#ifdef HAVE_SYS_ENDIAN_H +#include <sys/endian.h> +#endif +#endif + +// Qt +#include <qimage.h> +#include <qcolor.h> + +#include <kdeversion.h> +#include <kcpuinfo.h> + +#include <string.h> +#include <stdlib.h> + +// Local +#include "imageutils.h" + +// everything in namespace +namespace ImageUtils { + + +#define Max QMAX +#define Min QMIN + +// mustn't be less than used precision (i.e. 1/fastfloat::RATIO) +#define MagickEpsilon 0.0002 + +// fastfloat begin +// this class stores floating point numbers as integers, with BITS shift, +// i.e. value XYZ is stored as XYZ * RATIO +struct fastfloat + { + private: + enum { BITS = 12, RATIO = 4096 }; + public: + fastfloat() {} + fastfloat( long v ) : value( v << BITS ) {} + fastfloat( int v ) : value( v << BITS ) {} + fastfloat( double v ) : value( static_cast< long >( v * RATIO + 0.5 )) {} + double toDouble() const { return static_cast< double >( value ) / RATIO; } + long toLong() const { return value >> BITS; } + fastfloat& operator += ( fastfloat r ) { value += r.value; return *this; } + fastfloat& operator -= ( fastfloat r ) { value -= r.value; return *this; } + fastfloat& operator *= ( fastfloat r ) { value = static_cast< long long >( value ) * r.value >> BITS; return *this; } + fastfloat& operator /= ( fastfloat r ) { value = ( static_cast< long long >( value ) << BITS ) / r.value; return *this; } + bool operator< ( fastfloat r ) const { return value < r.value; } + bool operator<= ( fastfloat r ) const { return value <= r.value; } + bool operator> ( fastfloat r ) const { return value > r.value; } + bool operator>= ( fastfloat r ) const { return value >= r.value; } + bool operator== ( fastfloat r ) const { return value == r.value; } + bool operator!= ( fastfloat r ) const { return value != r.value; } + fastfloat operator-() const { return fastfloat( -value, false ); } + private: + fastfloat( long v, bool ) : value( v ) {} // for operator-() + long value; + }; + +inline fastfloat operator+ ( fastfloat l, fastfloat r ) { return fastfloat( l ) += r; } +inline fastfloat operator- ( fastfloat l, fastfloat r ) { return fastfloat( l ) -= r; } +inline fastfloat operator* ( fastfloat l, fastfloat r ) { return fastfloat( l ) *= r; } +inline fastfloat operator/ ( fastfloat l, fastfloat r ) { return fastfloat( l ) /= r; } + +inline bool operator< ( fastfloat l, double r ) { return l < fastfloat( r ); } +inline bool operator<= ( fastfloat l, double r ) { return l <= fastfloat( r ); } +inline bool operator> ( fastfloat l, double r ) { return l > fastfloat( r ); } +inline bool operator>= ( fastfloat l, double r ) { return l >= fastfloat( r ); } +inline bool operator== ( fastfloat l, double r ) { return l == fastfloat( r ); } +inline bool operator!= ( fastfloat l, double r ) { return l != fastfloat( r ); } + +inline bool operator< ( double l, fastfloat r ) { return fastfloat( l ) < r ; } +inline bool operator<= ( double l, fastfloat r ) { return fastfloat( l ) <= r ; } +inline bool operator> ( double l, fastfloat r ) { return fastfloat( l ) > r ; } +inline bool operator>= ( double l, fastfloat r ) { return fastfloat( l ) >= r ; } +inline bool operator== ( double l, fastfloat r ) { return fastfloat( l ) == r ; } +inline bool operator!= ( double l, fastfloat r ) { return fastfloat( l ) != r ; } + +inline double fasttodouble( fastfloat v ) { return v.toDouble(); } +inline long fasttolong( fastfloat v ) { return v.toLong(); } + +#if 1 // change to 0 to turn fastfloat usage off +#else +#define fastfloat double +#define fasttodouble( v ) double( v ) +#define fasttolong( v ) long( v ) +#endif + +//fastfloat end + + +typedef fastfloat (*Filter)(const fastfloat, const fastfloat); + +typedef struct _ContributionInfo +{ + fastfloat + weight; + + long + pixel; +} ContributionInfo; + + +/* +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% % +% % +% % +% R e s i z e I m a g e % +% % +% % +% % +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% +% ResizeImage() scales an image to the desired dimensions with one of these +% filters: +% +% Bessel Blackman Box +% Catrom Cubic Gaussian +% Hanning Hermite Lanczos +% Mitchell Point Quandratic +% Sinc Triangle +% +% Most of the filters are FIR (finite impulse response), however, Bessel, +% Gaussian, and Sinc are IIR (infinite impulse response). Bessel and Sinc +% are windowed (brought down to zero) with the Blackman filter. +% +% ResizeImage() was inspired by Paul Heckbert's zoom program. +% +% The format of the ResizeImage method is: +% +% Image *ResizeImage(Image *image,const unsigned long columns, +% const unsigned long rows,const FilterTypes filter,const double blur, +% ExceptionInfo *exception) +% +% A description of each parameter follows: +% +% o image: The image. +% +% o columns: The number of columns in the scaled image. +% +% o rows: The number of rows in the scaled image. +% +% o filter: Image filter to use. +% +% o blur: The blur factor where > 1 is blurry, < 1 is sharp. +% +% o exception: Return any errors or warnings in this structure. +% +% +*/ + +#if 0 +static fastfloat Bessel(const fastfloat x,const fastfloat) +{ + if (x == 0.0) + return(MagickPI/4.0); + return(BesselOrderOne(MagickPI*x)/(2.0*x)); +} + +static fastfloat Sinc(const fastfloat x,const fastfloat) +{ + if (x == 0.0) + return(1.0); + return(sin(MagickPI*x)/(MagickPI*x)); +} + +static fastfloat Blackman(const fastfloat x,const fastfloat) +{ + return(0.42+0.5*cos(MagickPI*x)+0.08*cos(2*MagickPI*x)); +} + +static fastfloat BlackmanBessel(const fastfloat x,const fastfloat) +{ + return(Blackman(x/support,support)*Bessel(x,support)); +} + +static fastfloat BlackmanSinc(const fastfloat x,const fastfloat) +{ + return(Blackman(x/support,support)*Sinc(x,support)); +} +#endif + +static fastfloat Box(const fastfloat x,const fastfloat) +{ + if (x < -0.5) + return(0.0); + if (x < 0.5) + return(1.0); + return(0.0); +} + +#if 0 +static fastfloat Catrom(const fastfloat x,const fastfloat) +{ + if (x < -2.0) + return(0.0); + if (x < -1.0) + return(0.5*(4.0+x*(8.0+x*(5.0+x)))); + if (x < 0.0) + return(0.5*(2.0+x*x*(-5.0-3.0*x))); + if (x < 1.0) + return(0.5*(2.0+x*x*(-5.0+3.0*x))); + if (x < 2.0) + return(0.5*(4.0+x*(-8.0+x*(5.0-x)))); + return(0.0); +} + +static fastfloat Cubic(const fastfloat x,const fastfloat) +{ + if (x < -2.0) + return(0.0); + if (x < -1.0) + return((2.0+x)*(2.0+x)*(2.0+x)/6.0); + if (x < 0.0) + return((4.0+x*x*(-6.0-3.0*x))/6.0); + if (x < 1.0) + return((4.0+x*x*(-6.0+3.0*x))/6.0); + if (x < 2.0) + return((2.0-x)*(2.0-x)*(2.0-x)/6.0); + return(0.0); +} + +static fastfloat Gaussian(const fastfloat x,const fastfloat) +{ + return(exp(-2.0*x*x)*sqrt(2.0/MagickPI)); +} + +static fastfloat Hanning(const fastfloat x,const fastfloat) +{ + return(0.5+0.5*cos(MagickPI*x)); +} + +static fastfloat Hamming(const fastfloat x,const fastfloat) +{ + return(0.54+0.46*cos(MagickPI*x)); +} + +static fastfloat Hermite(const fastfloat x,const fastfloat) +{ + if (x < -1.0) + return(0.0); + if (x < 0.0) + return((2.0*(-x)-3.0)*(-x)*(-x)+1.0); + if (x < 1.0) + return((2.0*x-3.0)*x*x+1.0); + return(0.0); +} + +static fastfloat Lanczos(const fastfloat x,const fastfloat support) +{ + if (x < -3.0) + return(0.0); + if (x < 0.0) + return(Sinc(-x,support)*Sinc(-x/3.0,support)); + if (x < 3.0) + return(Sinc(x,support)*Sinc(x/3.0,support)); + return(0.0); +} + +static fastfloat Mitchell(const fastfloat x,const fastfloat) +{ +#define B (1.0/3.0) +#define C (1.0/3.0) +#define P0 (( 6.0- 2.0*B )/6.0) +#define P2 ((-18.0+12.0*B+ 6.0*C)/6.0) +#define P3 (( 12.0- 9.0*B- 6.0*C)/6.0) +#define Q0 (( 8.0*B+24.0*C)/6.0) +#define Q1 (( -12.0*B-48.0*C)/6.0) +#define Q2 (( 6.0*B+30.0*C)/6.0) +#define Q3 (( - 1.0*B- 6.0*C)/6.0) + + if (x < -2.0) + return(0.0); + if (x < -1.0) + return(Q0-x*(Q1-x*(Q2-x*Q3))); + if (x < 0.0) + return(P0+x*x*(P2-x*P3)); + if (x < 1.0) + return(P0+x*x*(P2+x*P3)); + if (x < 2.0) + return(Q0+x*(Q1+x*(Q2+x*Q3))); + return(0.0); + +#undef B +#undef C +#undef P0 +#undef P2 +#undef P3 +#undef Q0 +#undef Q1 +#undef Q2 +#undef Q3 +} +#endif + +// this is the same like Mitchell, but it has different values +// for B and C, resulting in sharper images +// http://sourceforge.net/mailarchive/forum.php?thread_id=7445822&forum_id=1210 +static fastfloat Bicubic(const fastfloat x,const fastfloat) +{ +#define B (0.0/3.0) +#define C (2.0/3.0) +#define P0 (( 6.0- 2.0*B )/6.0) +#define P2 ((-18.0+12.0*B+ 6.0*C)/6.0) +#define P3 (( 12.0- 9.0*B- 6.0*C)/6.0) +#define Q0 (( 8.0*B+24.0*C)/6.0) +#define Q1 (( -12.0*B-48.0*C)/6.0) +#define Q2 (( 6.0*B+30.0*C)/6.0) +#define Q3 (( - 1.0*B- 6.0*C)/6.0) + + if (x < -2.0) + return(0.0); + if (x < -1.0) + return(Q0-x*(Q1-x*(Q2-x*Q3))); + if (x < 0.0) + return(P0+x*x*(P2-x*P3)); + if (x < 1.0) + return(P0+x*x*(P2+x*P3)); + if (x < 2.0) + return(Q0+x*(Q1+x*(Q2+x*Q3))); + return(0.0); + +#undef B +#undef C +#undef P0 +#undef P2 +#undef P3 +#undef Q0 +#undef Q1 +#undef Q2 +#undef Q3 +} + +#if 0 +static fastfloat Quadratic(const fastfloat x,const fastfloat) +{ + if (x < -1.5) + return(0.0); + if (x < -0.5) + return(0.5*(x+1.5)*(x+1.5)); + if (x < 0.5) + return(0.75-x*x); + if (x < 1.5) + return(0.5*(x-1.5)*(x-1.5)); + return(0.0); +} +#endif + +static fastfloat Triangle(const fastfloat x,const fastfloat) +{ + if (x < -1.0) + return(0.0); + if (x < 0.0) + return(1.0+x); + if (x < 1.0) + return(1.0-x); + return(0.0); +} + +static void HorizontalFilter(const QImage& source,QImage& destination, + const fastfloat x_factor,const fastfloat blur, + ContributionInfo *contribution, Filter filter, fastfloat filtersupport) +{ + fastfloat + center, + density, + scale, + support; + + long + n, + start, + stop, + y; + + register long + i, + x; + + /* + Apply filter to resize horizontally from source to destination. + */ + scale=blur*Max(1.0/x_factor,1.0); + support=scale* filtersupport; + if (support <= 0.5) + { + /* + Reduce to point sampling. + */ + support=0.5+MagickEpsilon; + scale=1.0; + } + scale=1.0/scale; + for (x=0; x < (long) destination.width(); x++) + { + center=(fastfloat) (x+0.5)/x_factor; + start= fasttolong(Max(center-support+0.5,0)); + stop= fasttolong(Min(center+support+0.5,source.width())); + density=0.0; + for (n=0; n < (stop-start); n++) + { + contribution[n].pixel=start+n; + contribution[n].weight= + filter (scale*(start+n-center+0.5), filtersupport ); + density+=contribution[n].weight; + } + if ((density != 0.0) && (density != 1.0)) + { + /* + Normalize. + */ + density=1.0/density; + for (i=0; i < n; i++) + contribution[i].weight*=density; + } +// p=AcquireImagePixels(source,contribution[0].pixel,0,contribution[n-1].pixel- +// contribution[0].pixel+1,source->rows,exception); +// q=SetImagePixels(destination,x,0,1,destination->rows); + for (y=0; y < (long) destination.height(); y++) + { + fastfloat red = 0; + fastfloat green = 0; + fastfloat blue = 0; + fastfloat alpha = 0; + for (i=0; i < n; i++) + { + int px = contribution[i].pixel; + int py = y; + QRgb p = reinterpret_cast< QRgb* >( source.jumpTable()[ py ])[ px ]; + red+=contribution[i].weight*qRed(p); + green+=contribution[i].weight*qGreen(p); + blue+=contribution[i].weight*qBlue(p); + alpha+=contribution[i].weight*qAlpha(p); + } + QRgb pix = qRgba( + fasttolong( red < 0 ? 0 : red > 255 ? 255 : red + 0.5 ), + fasttolong( green < 0 ? 0 : green > 255 ? 255 : green + 0.5 ), + fasttolong( blue < 0 ? 0 : blue > 255 ? 255 : blue + 0.5 ), + fasttolong( alpha < 0 ? 0 : alpha > 255 ? 255 : alpha + 0.5 )); + reinterpret_cast< QRgb* >( destination.jumpTable()[ y ])[ x ] = pix; + } + } +} + +static void VerticalFilter(const QImage& source,QImage& destination, + const fastfloat y_factor,const fastfloat blur, + ContributionInfo *contribution, Filter filter, fastfloat filtersupport ) +{ + fastfloat + center, + density, + scale, + support; + + long + n, + start, + stop, + x; + + register long + i, + y; + + /* + Apply filter to resize vertically from source to destination. + */ + scale=blur*Max(1.0/y_factor,1.0); + support=scale* filtersupport; + if (support <= 0.5) + { + /* + Reduce to point sampling. + */ + support=0.5+MagickEpsilon; + scale=1.0; + } + scale=1.0/scale; + for (y=0; y < (long) destination.height(); y++) + { + center=(fastfloat) (y+0.5)/y_factor; + start= fasttolong(Max(center-support+0.5,0)); + stop= fasttolong(Min(center+support+0.5,source.height())); + density=0.0; + for (n=0; n < (stop-start); n++) + { + contribution[n].pixel=start+n; + contribution[n].weight= + filter (scale*(start+n-center+0.5), filtersupport); + density+=contribution[n].weight; + } + if ((density != 0.0) && (density != 1.0)) + { + /* + Normalize. + */ + density=1.0/density; + for (i=0; i < n; i++) + contribution[i].weight*=density; + } +// p=AcquireImagePixels(source,0,contribution[0].pixel,source->columns, +// contribution[n-1].pixel-contribution[0].pixel+1,exception); +// q=SetImagePixels(destination,0,y,destination->columns,1); + for (x=0; x < (long) destination.width(); x++) + { + fastfloat red = 0; + fastfloat green = 0; + fastfloat blue = 0; + fastfloat alpha = 0; + for (i=0; i < n; i++) + { + int px = x; + int py = contribution[i].pixel; + QRgb p = reinterpret_cast< QRgb* >( source.jumpTable()[ py ])[ px ]; + red+=contribution[i].weight*qRed(p); + green+=contribution[i].weight*qGreen(p); + blue+=contribution[i].weight*qBlue(p); + alpha+=contribution[i].weight*qAlpha(p); + } + QRgb pix = qRgba( + fasttolong( red < 0 ? 0 : red > 255 ? 255 : red + 0.5 ), + fasttolong( green < 0 ? 0 : green > 255 ? 255 : green + 0.5 ), + fasttolong( blue < 0 ? 0 : blue > 255 ? 255 : blue + 0.5 ), + fasttolong( alpha < 0 ? 0 : alpha > 255 ? 255 : alpha + 0.5 )); + reinterpret_cast< QRgb* >( destination.jumpTable()[ y ])[ x ] = pix; + } + } +} + +static QImage ResizeImage(const QImage& image,const int columns, + const int rows, Filter filter, fastfloat filtersupport, double blur) +{ + ContributionInfo + *contribution; + + fastfloat + support, + x_factor, + x_support, + y_factor, + y_support; + + /* + Initialize resize image attributes. + */ + if ((columns == image.width()) && (rows == image.height()) && (blur == 1.0)) + return image.copy(); + QImage resize_image( columns, rows, 32 ); + resize_image.setAlphaBuffer( image.hasAlphaBuffer()); + /* + Allocate filter contribution info. + */ + x_factor=(fastfloat) resize_image.width()/image.width(); + y_factor=(fastfloat) resize_image.height()/image.height(); +// i=(long) LanczosFilter; +// if (image->filter != UndefinedFilter) +// i=(long) image->filter; +// else +// if ((image->storage_class == PseudoClass) || image->matte || +// ((x_factor*y_factor) > 1.0)) +// i=(long) MitchellFilter; + x_support=blur*Max(1.0/x_factor,1.0)*filtersupport; + y_support=blur*Max(1.0/y_factor,1.0)*filtersupport; + support=Max(x_support,y_support); + if (support < filtersupport) + support=filtersupport; + contribution=new ContributionInfo[ fasttolong( 2.0*Max(support,0.5)+3 ) ]; + Q_CHECK_PTR( contribution ); + /* + Resize image. + */ + if (((fastfloat) columns*(image.height()+rows)) > + ((fastfloat) rows*(image.width()+columns))) + { + QImage source_image( columns, image.height(), 32 ); + source_image.setAlphaBuffer( image.hasAlphaBuffer()); + HorizontalFilter(image,source_image,x_factor,blur, + contribution,filter,filtersupport); + VerticalFilter(source_image,resize_image,y_factor, + blur,contribution,filter,filtersupport); + } + else + { + QImage source_image( image.width(), rows, 32 ); + source_image.setAlphaBuffer( image.hasAlphaBuffer()); + VerticalFilter(image,source_image,y_factor,blur, + contribution,filter,filtersupport); + HorizontalFilter(source_image,resize_image,x_factor, + blur,contribution,filter,filtersupport); + } + /* + Free allocated memory. + */ + delete[] contribution; + return(resize_image); +} + + +#undef Max +#undef Min +#undef MagickEpsilon + + +// filters and their matching support values +#if 0 + static const FilterInfo + filters[SincFilter+1] = + { + { Box, 0.0 }, + { Box, 0.0 }, + { Box, 0.5 }, + { Triangle, 1.0 }, + { Hermite, 1.0 }, + { Hanning, 1.0 }, + { Hamming, 1.0 }, + { Blackman, 1.0 }, + { Gaussian, 1.25 }, + { Quadratic, 1.5 }, + { Cubic, 2.0 }, + { Catrom, 2.0 }, + { Mitchell, 2.0 }, + { Lanczos, 3.0 }, + { BlackmanBessel, 3.2383 }, + { BlackmanSinc, 4.0 } + }; +#endif + + +/* +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% % +% % +% % +% S a m p l e I m a g e % +% % +% % +% % +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% +% SampleImage() scales an image to the desired dimensions with pixel +% sampling. Unlike other scaling methods, this method does not introduce +% any additional color into the scaled image. +% +% The format of the SampleImage method is: +% +% Image *SampleImage(const Image *image,const unsigned long columns, +% const unsigned long rows,ExceptionInfo *exception) +% +% A description of each parameter follows: +% +% o image: The image. +% +% o columns: The number of columns in the sampled image. +% +% o rows: The number of rows in the sampled image. +% +% o exception: Return any errors or warnings in this structure. +% +% +*/ +QImage SampleImage(const QImage& image,const int columns, + const int rows) +{ + int + *x_offset, + *y_offset; + + long + j, + y; + + uchar + *pixels; + + register const uchar + *p; + + register long + x; + + register uchar + *q; + + /* + Initialize sampled image attributes. + */ + if ((columns == image.width()) && (rows == image.height())) + return image; + // This function is modified to handle any image depth, not only + // 32bit like the ImageMagick original. This avoids the relatively + // expensive conversion. + const int d = image.depth() / 8; + QImage sample_image( columns, rows, image.depth()); + sample_image.setAlphaBuffer( image.hasAlphaBuffer()); + /* + Allocate scan line buffer and column offset buffers. + */ + pixels= new uchar[ image.width() * d ]; + x_offset= new int[ sample_image.width() ]; + y_offset= new int[ sample_image.height() ]; + /* + Initialize pixel offsets. + */ +// In the following several code 0.5 needs to be added, otherwise the image +// would be moved by half a pixel to bottom-right, just like +// with Qt's QImage::scale() + for (x=0; x < (long) sample_image.width(); x++) + { + x_offset[x]=int((x+0.5)*image.width()/sample_image.width()); + } + for (y=0; y < (long) sample_image.height(); y++) + { + y_offset[y]=int((y+0.5)*image.height()/sample_image.height()); + } + /* + Sample each row. + */ + j=(-1); + for (y=0; y < (long) sample_image.height(); y++) + { + q= sample_image.scanLine( y ); + if (j != y_offset[y] ) + { + /* + Read a scan line. + */ + j= y_offset[y]; + p= image.scanLine( j ); + (void) memcpy(pixels,p,image.width()*d); + } + /* + Sample each column. + */ + switch( d ) + { + case 1: // 8bit + for (x=0; x < (long) sample_image.width(); x++) + { + *q++=pixels[ x_offset[x] ]; + } + break; + case 4: // 32bit + for (x=0; x < (long) sample_image.width(); x++) + { + *(QRgb*)q=((QRgb*)pixels)[ x_offset[x] ]; + q += d; + } + break; + default: + for (x=0; x < (long) sample_image.width(); x++) + { + memcpy( q, pixels + x_offset[x] * d, d ); + q += d; + } + break; + } + } + if( d != 4 ) // != 32bit + { + sample_image.setNumColors( image.numColors()); + for( int i = 0; i < image.numColors(); ++i ) + sample_image.setColor( i, image.color( i )); + } + delete[] y_offset; + delete[] x_offset; + delete[] pixels; + return sample_image; +} + + +// ImageMagick code end + + +// Imlib2/Mosfet code begin +// ------------------------ + +// This code is Imlib2 code, additionally modified by Mosfet, and with few small +// modifications for Gwenview. The MMX scaling code also belongs to it. + +// The original license texts follow. + +/** + * This is the normal smoothscale method, based on Imlib2's smoothscale. + * + * Originally I took the algorithm used in NetPBM and Qt and added MMX/3dnow + * optimizations. It ran in about 1/2 the time as Qt. Then I ported Imlib's + * C algorithm and it ran at about the same speed as my MMX optimized one... + * Finally I ported Imlib's MMX version and it ran in less than half the + * time as my MMX algorithm, (taking only a quarter of the time Qt does). + * + * Changes include formatting, namespaces and other C++'ings, removal of old + * #ifdef'ed code, and removal of unneeded border calculation code. + * + * Imlib2 is (C) Carsten Haitzler and various contributors. The MMX code + * is by Willem Monsuwe <willem@stack.nl>. All other modifications are + * (C) Daniel M. Duley. + */ + +/* + Copyright (C) 2004 Daniel M. Duley <dan.duley@verizon.net> + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions +are met: + +1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. +2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + +THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR +IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, +INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +*/ + +/* +Copyright (C) 2000 Carsten Haitzler and various contributors (see AUTHORS) + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to +deal in the Software without restriction, including without limitation the +rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies of the Software and its Copyright notices. In addition publicly +documented acknowledgment must be given that this software has been used if no +source code of this software is made available publicly. This includes +acknowledgments in either Copyright notices, Manuals, Publicity and Marketing +documents or any documentation provided with any product containing this +software. This License does not apply to any software that links to the +libraries provided by this software (statically or dynamically), but only to +the software provided. + +Please see the COPYING.PLAIN for a plain-english explanation of this notice +and it's intent. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER +IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +*/ + +namespace MImageScale{ + typedef struct __mimage_scale_info + { + int *xpoints; + unsigned int **ypoints; + int *xapoints, *yapoints; + int xup_yup; + } MImageScaleInfo; + + unsigned int** mimageCalcYPoints(unsigned int *src, int sow, int sh, + int dh); + int* mimageCalcXPoints(int sw, int dw); + int* mimageCalcApoints(int s, int d, int up); + MImageScaleInfo* mimageFreeScaleInfo(MImageScaleInfo *isi); + MImageScaleInfo *mimageCalcScaleInfo(QImage &img, int sw, int sh, + int dw, int dh, char aa, int sow); + void mimageSampleRGBA(MImageScaleInfo *isi, unsigned int *dest, int dxx, + int dyy, int dx, int dy, int dw, int dh, int dow); + void mimageScaleAARGBA(MImageScaleInfo *isi, unsigned int *dest, int dxx, + int dyy, int dx, int dy, int dw, int dh, int dow, + int sow); + void mimageScaleAARGB(MImageScaleInfo *isi, unsigned int *dest, int dxx, + int dyy, int dx, int dy, int dw, int dh, int dow, int + sow); + QImage smoothScale(const QImage& img, int dw, int dh); + typedef long long llong; +} + +#ifdef HAVE_X86_MMX +extern "C" { + void __mimageScale_mmx_AARGBA(MImageScale::MImageScaleInfo *isi, + unsigned int *dest, int dxx, int dyy, + int dx, int dy, int dw, int dh, + int dow, int sow); +} +#endif + +using namespace MImageScale; + +QImage MImageScale::smoothScale(const QImage& image, int dw, int dh) +{ + QImage img = image.depth() < 32 ? image.convertDepth( 32 ) : image; + int w = img.width(); + int h = img.height(); + + int sow = img.bytesPerLine(); + // handle CroppedQImage + if( img.height() > 1 && sow != img.scanLine( 1 ) - img.scanLine( 0 )) + sow = img.scanLine( 1 ) - img.scanLine( 0 ); + sow = sow / ( img.depth() / 8 ); + + MImageScaleInfo *scaleinfo = + mimageCalcScaleInfo(img, w, h, dw, dh, true, sow); + if(!scaleinfo) + return QImage(); + + QImage buffer(dw, dh, 32); + buffer.setAlphaBuffer(img.hasAlphaBuffer()); + +#ifdef HAVE_X86_MMX +//#warning Using MMX Smoothscale + bool haveMMX = KCPUInfo::haveExtension( KCPUInfo::IntelMMX ); + if(haveMMX){ + __mimageScale_mmx_AARGBA(scaleinfo, (unsigned int *)buffer.scanLine(0), + 0, 0, 0, 0, dw, dh, dw, sow); + } + else +#endif + { + if(img.hasAlphaBuffer()) + mimageScaleAARGBA(scaleinfo, (unsigned int *)buffer.scanLine(0), 0, 0, + 0, 0, dw, dh, dw, sow); + else + mimageScaleAARGB(scaleinfo, (unsigned int *)buffer.scanLine(0), 0, 0, + 0, 0, dw, dh, dw, sow); + } + mimageFreeScaleInfo(scaleinfo); + return(buffer); +} + +// +// Code ported from Imlib... +// + +// FIXME: replace with mRed, etc... These work on pointers to pixels, not +// pixel values +#if BYTE_ORDER == BIG_ENDIAN +#define A_VAL(p) ((unsigned char *)(p))[0] +#define R_VAL(p) ((unsigned char *)(p))[1] +#define G_VAL(p) ((unsigned char *)(p))[2] +#define B_VAL(p) ((unsigned char *)(p))[3] +#elif BYTE_ORDER == LITTLE_ENDIAN +#define A_VAL(p) ((unsigned char *)(p))[3] +#define R_VAL(p) ((unsigned char *)(p))[2] +#define G_VAL(p) ((unsigned char *)(p))[1] +#define B_VAL(p) ((unsigned char *)(p))[0] +#else +#error "BYTE_ORDER is not defined" +#endif + +#define INV_XAP (256 - xapoints[x]) +#define XAP (xapoints[x]) +#define INV_YAP (256 - yapoints[dyy + y]) +#define YAP (yapoints[dyy + y]) + +unsigned int** MImageScale::mimageCalcYPoints(unsigned int *src, + int sow, int sh, int dh) +{ + unsigned int **p; + int i, j = 0; + int rv = 0; + llong val, inc; + + if(dh < 0){ + dh = -dh; + rv = 1; + } + p = new unsigned int* [dh+1]; + + val = 0; + inc = (llong(sh) << 16) / dh; + for(i = 0; i < dh; i++){ + p[j++] = src + ((val >> 16) * sow); + val += inc; + } + if(rv){ + for(i = dh / 2; --i >= 0; ){ + unsigned int *tmp = p[i]; + p[i] = p[dh - i - 1]; + p[dh - i - 1] = tmp; + } + } + return(p); +} + +int* MImageScale::mimageCalcXPoints(int sw, int dw) +{ + int *p, i, j = 0; + int rv = 0; + llong val, inc; + + if(dw < 0){ + dw = -dw; + rv = 1; + } + p = new int[dw+1]; + + val = 0; + inc = (llong(sw) << 16) / dw; + for(i = 0; i < dw; i++){ + p[j++] = (val >> 16); + val += inc; + } + + if(rv){ + for(i = dw / 2; --i >= 0; ){ + int tmp = p[i]; + p[i] = p[dw - i - 1]; + p[dw - i - 1] = tmp; + } + } + return(p); +} + +int* MImageScale::mimageCalcApoints(int s, int d, int up) +{ + int *p, i, j = 0, rv = 0; + + if(d < 0){ + rv = 1; + d = -d; + } + p = new int[d]; + + /* scaling up */ + if(up){ + llong val, inc; + + val = 0; + inc = (llong(s) << 16) / d; + for(i = 0; i < d; i++){ + p[j++] = (val >> 8) - ((val >> 8) & 0xffffff00); + if((val >> 16) >= (s - 1)) + p[j - 1] = 0; + val += inc; + } + } + /* scaling down */ + else{ + llong val, inc; + int ap, Cp; + val = 0; + inc = (llong(s) << 16) / d; + Cp = ((llong(d) << 14) / s) + 1; + for(i = 0; i < d; i++){ + ap = ((0x100 - ((val >> 8) & 0xff)) * Cp) >> 8; + p[j] = ap | (Cp << 16); + j++; + val += inc; + } + } + if(rv){ + int tmp; + for(i = d / 2; --i >= 0; ){ + tmp = p[i]; + p[i] = p[d - i - 1]; + p[d - i - 1] = tmp; + } + } + return(p); +} + +MImageScaleInfo* MImageScale::mimageFreeScaleInfo(MImageScaleInfo *isi) +{ + if(isi){ + delete[] isi->xpoints; + delete[] isi->ypoints; + delete[] isi->xapoints; + delete[] isi->yapoints; + delete isi; + } + return(NULL); +} + +MImageScaleInfo* MImageScale::mimageCalcScaleInfo(QImage &img, int sw, int sh, + int dw, int dh, char aa, int sow) +{ + MImageScaleInfo *isi; + int scw, sch; + + scw = dw * img.width() / sw; + sch = dh * img.height() / sh; + + isi = new MImageScaleInfo; + if(!isi) + return(NULL); + memset(isi, 0, sizeof(MImageScaleInfo)); + + isi->xup_yup = (abs(dw) >= sw) + ((abs(dh) >= sh) << 1); + + isi->xpoints = mimageCalcXPoints(img.width(), scw); + if(!isi->xpoints) + return(mimageFreeScaleInfo(isi)); + isi->ypoints = mimageCalcYPoints((unsigned int *)img.scanLine(0), + sow, img.height(), sch ); + if (!isi->ypoints) + return(mimageFreeScaleInfo(isi)); + if(aa){ + isi->xapoints = mimageCalcApoints(img.width(), scw, isi->xup_yup & 1); + if(!isi->xapoints) + return(mimageFreeScaleInfo(isi)); + isi->yapoints = mimageCalcApoints(img.height(), sch, isi->xup_yup & 2); + if(!isi->yapoints) + return(mimageFreeScaleInfo(isi)); + } + return(isi); +} + +/* scale by pixel sampling only */ +void MImageScale::mimageSampleRGBA(MImageScaleInfo *isi, unsigned int *dest, + int dxx, int dyy, int dx, int dy, int dw, + int dh, int dow) +{ + unsigned int *sptr, *dptr; + int x, y, end; + unsigned int **ypoints = isi->ypoints; + int *xpoints = isi->xpoints; + + /* whats the last pixel ont he line so we stop there */ + end = dxx + dw; + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + /* get the pointer to the start of the destination scanline */ + dptr = dest + dx + ((y + dy) * dow); + /* calculate the source line we'll scan from */ + sptr = ypoints[dyy + y]; + /* go thru the scanline and copy across */ + for(x = dxx; x < end; x++) + *dptr++ = sptr[xpoints[x]]; + } +} + +/* FIXME: NEED to optimise ScaleAARGBA - currently its "ok" but needs work*/ + +/* scale by area sampling */ +void MImageScale::mimageScaleAARGBA(MImageScaleInfo *isi, unsigned int *dest, + int dxx, int dyy, int dx, int dy, int dw, + int dh, int dow, int sow) +{ + unsigned int *sptr, *dptr; + int x, y, end; + unsigned int **ypoints = isi->ypoints; + int *xpoints = isi->xpoints; + int *xapoints = isi->xapoints; + int *yapoints = isi->yapoints; + + end = dxx + dw; + /* scaling up both ways */ + if(isi->xup_yup == 3){ + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + /* calculate the source line we'll scan from */ + dptr = dest + dx + ((y + dy) * dow); + sptr = ypoints[dyy + y]; + if(YAP > 0){ + for(x = dxx; x < end; x++){ + int r, g, b, a; + int rr, gg, bb, aa; + unsigned int *pix; + + if(XAP > 0){ + pix = ypoints[dyy + y] + xpoints[x]; + r = R_VAL(pix) * INV_XAP; + g = G_VAL(pix) * INV_XAP; + b = B_VAL(pix) * INV_XAP; + a = A_VAL(pix) * INV_XAP; + pix++; + r += R_VAL(pix) * XAP; + g += G_VAL(pix) * XAP; + b += B_VAL(pix) * XAP; + a += A_VAL(pix) * XAP; + pix += sow; + rr = R_VAL(pix) * XAP; + gg = G_VAL(pix) * XAP; + bb = B_VAL(pix) * XAP; + aa = A_VAL(pix) * XAP; + pix--; + rr += R_VAL(pix) * INV_XAP; + gg += G_VAL(pix) * INV_XAP; + bb += B_VAL(pix) * INV_XAP; + aa += A_VAL(pix) * INV_XAP; + r = ((rr * YAP) + (r * INV_YAP)) >> 16; + g = ((gg * YAP) + (g * INV_YAP)) >> 16; + b = ((bb * YAP) + (b * INV_YAP)) >> 16; + a = ((aa * YAP) + (a * INV_YAP)) >> 16; + *dptr++ = qRgba(r, g, b, a); + } + else{ + pix = ypoints[dyy + y] + xpoints[x]; + r = R_VAL(pix) * INV_YAP; + g = G_VAL(pix) * INV_YAP; + b = B_VAL(pix) * INV_YAP; + a = A_VAL(pix) * INV_YAP; + pix += sow; + r += R_VAL(pix) * YAP; + g += G_VAL(pix) * YAP; + b += B_VAL(pix) * YAP; + a += A_VAL(pix) * YAP; + r >>= 8; + g >>= 8; + b >>= 8; + a >>= 8; + *dptr++ = qRgba(r, g, b, a); + } + } + } + else{ + for(x = dxx; x < end; x++){ + int r, g, b, a; + unsigned int *pix; + + if(XAP > 0){ + pix = ypoints[dyy + y] + xpoints[x]; + r = R_VAL(pix) * INV_XAP; + g = G_VAL(pix) * INV_XAP; + b = B_VAL(pix) * INV_XAP; + a = A_VAL(pix) * INV_XAP; + pix++; + r += R_VAL(pix) * XAP; + g += G_VAL(pix) * XAP; + b += B_VAL(pix) * XAP; + a += A_VAL(pix) * XAP; + r >>= 8; + g >>= 8; + b >>= 8; + a >>= 8; + *dptr++ = qRgba(r, g, b, a); + } + else + *dptr++ = sptr[xpoints[x] ]; + } + } + } + } + /* if we're scaling down vertically */ + else if(isi->xup_yup == 1){ + /*\ 'Correct' version, with math units prepared for MMXification \*/ + int Cy, j; + unsigned int *pix; + int r, g, b, a, rr, gg, bb, aa; + int yap; + + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + Cy = YAP >> 16; + yap = YAP & 0xffff; + + dptr = dest + dx + ((y + dy) * dow); + for(x = dxx; x < end; x++){ + pix = ypoints[dyy + y] + xpoints[x]; + r = (R_VAL(pix) * yap) >> 10; + g = (G_VAL(pix) * yap) >> 10; + b = (B_VAL(pix) * yap) >> 10; + a = (A_VAL(pix) * yap) >> 10; + for(j = (1 << 14) - yap; j > Cy; j -= Cy){ + pix += sow; + r += (R_VAL(pix) * Cy) >> 10; + g += (G_VAL(pix) * Cy) >> 10; + b += (B_VAL(pix) * Cy) >> 10; + a += (A_VAL(pix) * Cy) >> 10; + } + if(j > 0){ + pix += sow; + r += (R_VAL(pix) * j) >> 10; + g += (G_VAL(pix) * j) >> 10; + b += (B_VAL(pix) * j) >> 10; + a += (A_VAL(pix) * j) >> 10; + } + if(XAP > 0){ + pix = ypoints[dyy + y] + xpoints[x] + 1; + rr = (R_VAL(pix) * yap) >> 10; + gg = (G_VAL(pix) * yap) >> 10; + bb = (B_VAL(pix) * yap) >> 10; + aa = (A_VAL(pix) * yap) >> 10; + for(j = (1 << 14) - yap; j > Cy; j -= Cy){ + pix += sow; + rr += (R_VAL(pix) * Cy) >> 10; + gg += (G_VAL(pix) * Cy) >> 10; + bb += (B_VAL(pix) * Cy) >> 10; + aa += (A_VAL(pix) * Cy) >> 10; + } + if(j > 0){ + pix += sow; + rr += (R_VAL(pix) * j) >> 10; + gg += (G_VAL(pix) * j) >> 10; + bb += (B_VAL(pix) * j) >> 10; + aa += (A_VAL(pix) * j) >> 10; + } + r = r * INV_XAP; + g = g * INV_XAP; + b = b * INV_XAP; + a = a * INV_XAP; + r = (r + ((rr * XAP))) >> 12; + g = (g + ((gg * XAP))) >> 12; + b = (b + ((bb * XAP))) >> 12; + a = (a + ((aa * XAP))) >> 12; + } + else{ + r >>= 4; + g >>= 4; + b >>= 4; + a >>= 4; + } + *dptr = qRgba(r, g, b, a); + dptr++; + } + } + } + /* if we're scaling down horizontally */ + else if(isi->xup_yup == 2){ + /*\ 'Correct' version, with math units prepared for MMXification \*/ + int Cx, j; + unsigned int *pix; + int r, g, b, a, rr, gg, bb, aa; + int xap; + + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + dptr = dest + dx + ((y + dy) * dow); + for(x = dxx; x < end; x++){ + Cx = XAP >> 16; + xap = XAP & 0xffff; + + pix = ypoints[dyy + y] + xpoints[x]; + r = (R_VAL(pix) * xap) >> 10; + g = (G_VAL(pix) * xap) >> 10; + b = (B_VAL(pix) * xap) >> 10; + a = (A_VAL(pix) * xap) >> 10; + for(j = (1 << 14) - xap; j > Cx; j -= Cx){ + pix++; + r += (R_VAL(pix) * Cx) >> 10; + g += (G_VAL(pix) * Cx) >> 10; + b += (B_VAL(pix) * Cx) >> 10; + a += (A_VAL(pix) * Cx) >> 10; + } + if(j > 0){ + pix++; + r += (R_VAL(pix) * j) >> 10; + g += (G_VAL(pix) * j) >> 10; + b += (B_VAL(pix) * j) >> 10; + a += (A_VAL(pix) * j) >> 10; + } + if(YAP > 0){ + pix = ypoints[dyy + y] + xpoints[x] + sow; + rr = (R_VAL(pix) * xap) >> 10; + gg = (G_VAL(pix) * xap) >> 10; + bb = (B_VAL(pix) * xap) >> 10; + aa = (A_VAL(pix) * xap) >> 10; + for(j = (1 << 14) - xap; j > Cx; j -= Cx){ + pix++; + rr += (R_VAL(pix) * Cx) >> 10; + gg += (G_VAL(pix) * Cx) >> 10; + bb += (B_VAL(pix) * Cx) >> 10; + aa += (A_VAL(pix) * Cx) >> 10; + } + if(j > 0){ + pix++; + rr += (R_VAL(pix) * j) >> 10; + gg += (G_VAL(pix) * j) >> 10; + bb += (B_VAL(pix) * j) >> 10; + aa += (A_VAL(pix) * j) >> 10; + } + r = r * INV_YAP; + g = g * INV_YAP; + b = b * INV_YAP; + a = a * INV_YAP; + r = (r + ((rr * YAP))) >> 12; + g = (g + ((gg * YAP))) >> 12; + b = (b + ((bb * YAP))) >> 12; + a = (a + ((aa * YAP))) >> 12; + } + else{ + r >>= 4; + g >>= 4; + b >>= 4; + a >>= 4; + } + *dptr = qRgba(r, g, b, a); + dptr++; + } + } + } + /* if we're scaling down horizontally & vertically */ + else{ + /*\ 'Correct' version, with math units prepared for MMXification: + |*| The operation 'b = (b * c) >> 16' translates to pmulhw, + |*| so the operation 'b = (b * c) >> d' would translate to + |*| psllw (16 - d), %mmb; pmulh %mmc, %mmb + \*/ + int Cx, Cy, i, j; + unsigned int *pix; + int a, r, g, b, ax, rx, gx, bx; + int xap, yap; + + for(y = 0; y < dh; y++){ + Cy = YAP >> 16; + yap = YAP & 0xffff; + + dptr = dest + dx + ((y + dy) * dow); + for(x = dxx; x < end; x++){ + Cx = XAP >> 16; + xap = XAP & 0xffff; + + sptr = ypoints[dyy + y] + xpoints[x]; + pix = sptr; + sptr += sow; + rx = (R_VAL(pix) * xap) >> 9; + gx = (G_VAL(pix) * xap) >> 9; + bx = (B_VAL(pix) * xap) >> 9; + ax = (A_VAL(pix) * xap) >> 9; + pix++; + for(i = (1 << 14) - xap; i > Cx; i -= Cx){ + rx += (R_VAL(pix) * Cx) >> 9; + gx += (G_VAL(pix) * Cx) >> 9; + bx += (B_VAL(pix) * Cx) >> 9; + ax += (A_VAL(pix) * Cx) >> 9; + pix++; + } + if(i > 0){ + rx += (R_VAL(pix) * i) >> 9; + gx += (G_VAL(pix) * i) >> 9; + bx += (B_VAL(pix) * i) >> 9; + ax += (A_VAL(pix) * i) >> 9; + } + + r = (rx * yap) >> 14; + g = (gx * yap) >> 14; + b = (bx * yap) >> 14; + a = (ax * yap) >> 14; + + for(j = (1 << 14) - yap; j > Cy; j -= Cy){ + pix = sptr; + sptr += sow; + rx = (R_VAL(pix) * xap) >> 9; + gx = (G_VAL(pix) * xap) >> 9; + bx = (B_VAL(pix) * xap) >> 9; + ax = (A_VAL(pix) * xap) >> 9; + pix++; + for(i = (1 << 14) - xap; i > Cx; i -= Cx){ + rx += (R_VAL(pix) * Cx) >> 9; + gx += (G_VAL(pix) * Cx) >> 9; + bx += (B_VAL(pix) * Cx) >> 9; + ax += (A_VAL(pix) * Cx) >> 9; + pix++; + } + if(i > 0){ + rx += (R_VAL(pix) * i) >> 9; + gx += (G_VAL(pix) * i) >> 9; + bx += (B_VAL(pix) * i) >> 9; + ax += (A_VAL(pix) * i) >> 9; + } + + r += (rx * Cy) >> 14; + g += (gx * Cy) >> 14; + b += (bx * Cy) >> 14; + a += (ax * Cy) >> 14; + } + if(j > 0){ + pix = sptr; + sptr += sow; + rx = (R_VAL(pix) * xap) >> 9; + gx = (G_VAL(pix) * xap) >> 9; + bx = (B_VAL(pix) * xap) >> 9; + ax = (A_VAL(pix) * xap) >> 9; + pix++; + for(i = (1 << 14) - xap; i > Cx; i -= Cx){ + rx += (R_VAL(pix) * Cx) >> 9; + gx += (G_VAL(pix) * Cx) >> 9; + bx += (B_VAL(pix) * Cx) >> 9; + ax += (A_VAL(pix) * Cx) >> 9; + pix++; + } + if(i > 0){ + rx += (R_VAL(pix) * i) >> 9; + gx += (G_VAL(pix) * i) >> 9; + bx += (B_VAL(pix) * i) >> 9; + ax += (A_VAL(pix) * i) >> 9; + } + + r += (rx * j) >> 14; + g += (gx * j) >> 14; + b += (bx * j) >> 14; + a += (ax * j) >> 14; + } + + R_VAL(dptr) = r >> 5; + G_VAL(dptr) = g >> 5; + B_VAL(dptr) = b >> 5; + A_VAL(dptr) = a >> 5; + dptr++; + } + } + } +} + +/* scale by area sampling - IGNORE the ALPHA byte*/ +void MImageScale::mimageScaleAARGB(MImageScaleInfo *isi, unsigned int *dest, + int dxx, int dyy, int dx, int dy, int dw, + int dh, int dow, int sow) +{ + unsigned int *sptr, *dptr; + int x, y, end; + unsigned int **ypoints = isi->ypoints; + int *xpoints = isi->xpoints; + int *xapoints = isi->xapoints; + int *yapoints = isi->yapoints; + + end = dxx + dw; + /* scaling up both ways */ + if(isi->xup_yup == 3){ + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + /* calculate the source line we'll scan from */ + dptr = dest + dx + ((y + dy) * dow); + sptr = ypoints[dyy + y]; + if(YAP > 0){ + for(x = dxx; x < end; x++){ + int r = 0, g = 0, b = 0; + int rr = 0, gg = 0, bb = 0; + unsigned int *pix; + + if(XAP > 0){ + pix = ypoints[dyy + y] + xpoints[x]; + r = R_VAL(pix) * INV_XAP; + g = G_VAL(pix) * INV_XAP; + b = B_VAL(pix) * INV_XAP; + pix++; + r += R_VAL(pix) * XAP; + g += G_VAL(pix) * XAP; + b += B_VAL(pix) * XAP; + pix += sow; + rr = R_VAL(pix) * XAP; + gg = G_VAL(pix) * XAP; + bb = B_VAL(pix) * XAP; + pix --; + rr += R_VAL(pix) * INV_XAP; + gg += G_VAL(pix) * INV_XAP; + bb += B_VAL(pix) * INV_XAP; + r = ((rr * YAP) + (r * INV_YAP)) >> 16; + g = ((gg * YAP) + (g * INV_YAP)) >> 16; + b = ((bb * YAP) + (b * INV_YAP)) >> 16; + *dptr++ = qRgba(r, g, b, 0xff); + } + else{ + pix = ypoints[dyy + y] + xpoints[x]; + r = R_VAL(pix) * INV_YAP; + g = G_VAL(pix) * INV_YAP; + b = B_VAL(pix) * INV_YAP; + pix += sow; + r += R_VAL(pix) * YAP; + g += G_VAL(pix) * YAP; + b += B_VAL(pix) * YAP; + r >>= 8; + g >>= 8; + b >>= 8; + *dptr++ = qRgba(r, g, b, 0xff); + } + } + } + else{ + for(x = dxx; x < end; x++){ + int r = 0, g = 0, b = 0; + unsigned int *pix; + + if(XAP > 0){ + pix = ypoints[dyy + y] + xpoints[x]; + r = R_VAL(pix) * INV_XAP; + g = G_VAL(pix) * INV_XAP; + b = B_VAL(pix) * INV_XAP; + pix++; + r += R_VAL(pix) * XAP; + g += G_VAL(pix) * XAP; + b += B_VAL(pix) * XAP; + r >>= 8; + g >>= 8; + b >>= 8; + *dptr++ = qRgba(r, g, b, 0xff); + } + else + *dptr++ = sptr[xpoints[x] ]; + } + } + } + } + /* if we're scaling down vertically */ + else if(isi->xup_yup == 1){ + /*\ 'Correct' version, with math units prepared for MMXification \*/ + int Cy, j; + unsigned int *pix; + int r, g, b, rr, gg, bb; + int yap; + + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + Cy = YAP >> 16; + yap = YAP & 0xffff; + + dptr = dest + dx + ((y + dy) * dow); + for(x = dxx; x < end; x++){ + pix = ypoints[dyy + y] + xpoints[x]; + r = (R_VAL(pix) * yap) >> 10; + g = (G_VAL(pix) * yap) >> 10; + b = (B_VAL(pix) * yap) >> 10; + pix += sow; + for(j = (1 << 14) - yap; j > Cy; j -= Cy){ + r += (R_VAL(pix) * Cy) >> 10; + g += (G_VAL(pix) * Cy) >> 10; + b += (B_VAL(pix) * Cy) >> 10; + pix += sow; + } + if(j > 0){ + r += (R_VAL(pix) * j) >> 10; + g += (G_VAL(pix) * j) >> 10; + b += (B_VAL(pix) * j) >> 10; + } + if(XAP > 0){ + pix = ypoints[dyy + y] + xpoints[x] + 1; + rr = (R_VAL(pix) * yap) >> 10; + gg = (G_VAL(pix) * yap) >> 10; + bb = (B_VAL(pix) * yap) >> 10; + pix += sow; + for(j = (1 << 14) - yap; j > Cy; j -= Cy){ + rr += (R_VAL(pix) * Cy) >> 10; + gg += (G_VAL(pix) * Cy) >> 10; + bb += (B_VAL(pix) * Cy) >> 10; + pix += sow; + } + if(j > 0){ + rr += (R_VAL(pix) * j) >> 10; + gg += (G_VAL(pix) * j) >> 10; + bb += (B_VAL(pix) * j) >> 10; + } + r = r * INV_XAP; + g = g * INV_XAP; + b = b * INV_XAP; + r = (r + ((rr * XAP))) >> 12; + g = (g + ((gg * XAP))) >> 12; + b = (b + ((bb * XAP))) >> 12; + } + else{ + r >>= 4; + g >>= 4; + b >>= 4; + } + *dptr = qRgba(r, g, b, 0xff); + dptr++; + } + } + } + /* if we're scaling down horizontally */ + else if(isi->xup_yup == 2){ + /*\ 'Correct' version, with math units prepared for MMXification \*/ + int Cx, j; + unsigned int *pix; + int r, g, b, rr, gg, bb; + int xap; + + /* go through every scanline in the output buffer */ + for(y = 0; y < dh; y++){ + dptr = dest + dx + ((y + dy) * dow); + for(x = dxx; x < end; x++){ + Cx = XAP >> 16; + xap = XAP & 0xffff; + + pix = ypoints[dyy + y] + xpoints[x]; + r = (R_VAL(pix) * xap) >> 10; + g = (G_VAL(pix) * xap) >> 10; + b = (B_VAL(pix) * xap) >> 10; + pix++; + for(j = (1 << 14) - xap; j > Cx; j -= Cx){ + r += (R_VAL(pix) * Cx) >> 10; + g += (G_VAL(pix) * Cx) >> 10; + b += (B_VAL(pix) * Cx) >> 10; + pix++; + } + if(j > 0){ + r += (R_VAL(pix) * j) >> 10; + g += (G_VAL(pix) * j) >> 10; + b += (B_VAL(pix) * j) >> 10; + } + if(YAP > 0){ + pix = ypoints[dyy + y] + xpoints[x] + sow; + rr = (R_VAL(pix) * xap) >> 10; + gg = (G_VAL(pix) * xap) >> 10; + bb = (B_VAL(pix) * xap) >> 10; + pix++; + for(j = (1 << 14) - xap; j > Cx; j -= Cx){ + rr += (R_VAL(pix) * Cx) >> 10; + gg += (G_VAL(pix) * Cx) >> 10; + bb += (B_VAL(pix) * Cx) >> 10; + pix++; + } + if(j > 0){ + rr += (R_VAL(pix) * j) >> 10; + gg += (G_VAL(pix) * j) >> 10; + bb += (B_VAL(pix) * j) >> 10; + } + r = r * INV_YAP; + g = g * INV_YAP; + b = b * INV_YAP; + r = (r + ((rr * YAP))) >> 12; + g = (g + ((gg * YAP))) >> 12; + b = (b + ((bb * YAP))) >> 12; + } + else{ + r >>= 4; + g >>= 4; + b >>= 4; + } + *dptr = qRgba(r, g, b, 0xff); + dptr++; + } + } + } + /* fully optimized (i think) - onyl change of algorithm can help */ + /* if we're scaling down horizontally & vertically */ + else{ + /*\ 'Correct' version, with math units prepared for MMXification \*/ + int Cx, Cy, i, j; + unsigned int *pix; + int r, g, b, rx, gx, bx; + int xap, yap; + + for(y = 0; y < dh; y++){ + Cy = YAP >> 16; + yap = YAP & 0xffff; + + dptr = dest + dx + ((y + dy) * dow); + for(x = dxx; x < end; x++){ + Cx = XAP >> 16; + xap = XAP & 0xffff; + + sptr = ypoints[dyy + y] + xpoints[x]; + pix = sptr; + sptr += sow; + rx = (R_VAL(pix) * xap) >> 9; + gx = (G_VAL(pix) * xap) >> 9; + bx = (B_VAL(pix) * xap) >> 9; + pix++; + for(i = (1 << 14) - xap; i > Cx; i -= Cx){ + rx += (R_VAL(pix) * Cx) >> 9; + gx += (G_VAL(pix) * Cx) >> 9; + bx += (B_VAL(pix) * Cx) >> 9; + pix++; + } + if(i > 0){ + rx += (R_VAL(pix) * i) >> 9; + gx += (G_VAL(pix) * i) >> 9; + bx += (B_VAL(pix) * i) >> 9; + } + + r = (rx * yap) >> 14; + g = (gx * yap) >> 14; + b = (bx * yap) >> 14; + + for(j = (1 << 14) - yap; j > Cy; j -= Cy){ + pix = sptr; + sptr += sow; + rx = (R_VAL(pix) * xap) >> 9; + gx = (G_VAL(pix) * xap) >> 9; + bx = (B_VAL(pix) * xap) >> 9; + pix++; + for(i = (1 << 14) - xap; i > Cx; i -= Cx){ + rx += (R_VAL(pix) * Cx) >> 9; + gx += (G_VAL(pix) * Cx) >> 9; + bx += (B_VAL(pix) * Cx) >> 9; + pix++; + } + if(i > 0){ + rx += (R_VAL(pix) * i) >> 9; + gx += (G_VAL(pix) * i) >> 9; + bx += (B_VAL(pix) * i) >> 9; + } + + r += (rx * Cy) >> 14; + g += (gx * Cy) >> 14; + b += (bx * Cy) >> 14; + } + if(j > 0){ + pix = sptr; + sptr += sow; + rx = (R_VAL(pix) * xap) >> 9; + gx = (G_VAL(pix) * xap) >> 9; + bx = (B_VAL(pix) * xap) >> 9; + pix++; + for(i = (1 << 14) - xap; i > Cx; i -= Cx){ + rx += (R_VAL(pix) * Cx) >> 9; + gx += (G_VAL(pix) * Cx) >> 9; + bx += (B_VAL(pix) * Cx) >> 9; + pix++; + } + if(i > 0){ + rx += (R_VAL(pix) * i) >> 9; + gx += (G_VAL(pix) * i) >> 9; + bx += (B_VAL(pix) * i) >> 9; + } + + r += (rx * j) >> 14; + g += (gx * j) >> 14; + b += (bx * j) >> 14; + } + + R_VAL(dptr) = r >> 5; + G_VAL(dptr) = g >> 5; + B_VAL(dptr) = b >> 5; + dptr++; + } + } + } +} + +// Imlib2/Mosfet code end + + +// public functions : +// ------------------ + +// This function returns how many pixels around the zoomed area should be +// included in the image. This is used when doing incremental painting, because +// some smoothing algorithms use surrounding pixels and not including them +// could sometimes make the edges between incremental steps visible. +int extraScalePixels( SmoothAlgorithm alg, double zoom, double blur ) +{ + double filtersupport = 0; + Filter filter = NULL; + switch( alg ) { + case SMOOTH_NONE: + filter = NULL; + filtersupport = 0.0; + break; + case SMOOTH_FAST: + filter = Box; + filtersupport = 0.5; + break; + case SMOOTH_NORMAL: + filter = Triangle; + filtersupport = 1.0; + break; + case SMOOTH_BEST: +// filter = Mitchell; + filter = Bicubic; + filtersupport = 2.0; + break; + } + if( zoom == 1.0 || filtersupport == 0.0 ) return 0; + // Imlib2/Mosfet scale - I have really no idea how many pixels it needs + if( filter == Box && blur == 1.0 ) return int( 3 / zoom + 1 ); +// This is support size for ImageMagick's scaling. + double scale=blur*QMAX(1.0/zoom,1.0); + double support=scale* filtersupport; + if (support <= 0.5) support=0.5+0.000001; + return int( support + 1 ); +} + +QImage scale(const QImage& image, int width, int height, + SmoothAlgorithm alg, QImage::ScaleMode mode, double blur ) +{ + if( image.isNull()) return image.copy(); + + QSize newSize( image.size() ); + newSize.scale( QSize( width, height ), (QSize::ScaleMode)mode ); // ### remove cast in Qt 4.0 + newSize = newSize.expandedTo( QSize( 1, 1 )); // make sure it doesn't become null + + if ( newSize == image.size() ) return image.copy(); + + width = newSize.width(); + height = newSize.height(); + Filter filter = NULL; + fastfloat filtersupport; + + switch( alg ) { + case SMOOTH_NONE: + filter = NULL; + filtersupport = 0.0; + break; + case SMOOTH_FAST: + filter = Box; + filtersupport = 0.5; + break; + case SMOOTH_NORMAL: + default: + filter = Triangle; + filtersupport = 1.0; + break; + case SMOOTH_BEST: +// filter = Mitchell; + filter = Bicubic; + filtersupport = 2.0; + break; + } + + if( filter == Box && blur == 1.0 ) + return MImageScale::smoothScale( image, width, height ); + + if( filter == Box && width > image.width() && height > image.height() && blur == 1.0 ) { + filter = NULL; // Box doesn't really smooth when enlarging + } + + if( filter == NULL ) { + return SampleImage( image, width, height ); // doesn't need 32bit + } + + return ResizeImage( image.convertDepth( 32 ), width, height, filter, filtersupport, blur ); + // unlike Qt's smoothScale() this function introduces new colors to grayscale images ... oh well +} + + +} // namespace |