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=========================
Scale2x, Scale3x, Scale4x
=========================
Scale2x, Scale3x and Scale4x are real-time graphics effects
able to increase the size of small bitmaps guessing the
missing pixels without blurring the images.
They were originally developed for the AdvanceMAME project
in the year 2001 to improve the quality of old games running
at low video resolutions.
The specification of the algorithm and more details are at :
http://scale2x.sourceforge.net
This package contains some implementations of the effects
in C and MMX Pentium assembler, and command line tools to
convert manually .PNG images.
1 IMPLEMENTATION
================
The files scale2x.c and scale3x.c are the fast C and MMX
implementations of the effects.
The files scalebit.c and scalebit.h are the fast C implementations
of the effects ready to be applied to a generic bitmap.
Note that the implementation of the Scale4x effect is not
obvious without using a big intermediate buffer.
The files scalerx.c is a simple command line processors,
which uses the reference implementation of the effects.
The files scalex.c is another simple command line processors,
which uses the fast implementation of the effects.
2 TOOLS
=======
The command line tools "scalerx" and "scalex" read a .PNG file
and write another .PNG file with the effect applied.
The syntax of the programs is :
scalerx [-k N] [-w] FROM.png TO.png
scalex [-k N] FROM.png TO.png
The option -k can be used to select the scale factor.
The option -w can be used to scale textures with a wraparound effect.
To compile the command line tool you need the libz and libpng
libraries.
3 EXAMPLES
==========
The directory example/ contains some examples of the effects applyed
to a generic image and to a test image.
The suffix of the images means :
1 - Original image.
2 - Scale2x effect.
3 - Scale3x effect.
4 - Scale4x effect.
1x - Scaled normally 12 times.
2x - Scale2x effect and scaled normally up to 12 times.
3x - Scale3x effect and scaled normally up to 12 times.
4x - Scale4x effect and scaled normally up to 12 times.
The `x' images have the same final size and can be used to compare
pixel by pixel the result of the effects.
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Contents of gfx/edit/scale2x-morphos.lha PERMSSN UID GID PACKED SIZE RATIO METHOD CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic] 1030 2530 40.7% -lh5- 221f Aug 31 2008 scale2x-morphos/scale2x-morphos.readme
[generic] 107114 221436 48.4% -lh5- c6c7 Aug 31 2008 scale2x-morphos/scalerx
[generic] 105469 227092 46.4% -lh5- 2284 Aug 31 2008 scale2x-morphos/scalex
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[generic] 181 181 100.0% -lh0- 572c Jul 21 2003 scale2x-morphos/src/example/test-1.png
[generic] 1218 1804 67.5% -lh5- e6f4 Mar 3 2004 scale2x-morphos/src/example/test-1x.png
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[generic] 3545 10587 33.5% -lh5- 3684 Dec 23 2004 scale2x-morphos/src/missing
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[generic] 923 2327 39.7% -lh5- bf64 Aug 7 2004 scale2x-morphos/src/README
[generic] 4482 41989 10.7% -lh5- 7055 Aug 8 2004 scale2x-morphos/src/scale2x.c
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[generic] 3028 19269 15.7% -lh5- 8b7b Aug 8 2004 scale2x-morphos/src/scalebit.c
[generic] 801 1603 50.0% -lh5- 1431 Aug 28 2003 scale2x-morphos/src/scalebit.h
[generic] 3548 18970 18.7% -lh5- 7fbc Mar 15 2005 scale2x-morphos/src/scalerx.c
[generic] 1865 4592 40.6% -lh5- d2b0 Aug 8 2004 scale2x-morphos/src/scalex.c
[generic] 164 164 100.0% -lh0- 6562 Oct 15 1999 scale2x-morphos/src/test/basn0g01.png
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[generic] 3413 3435 99.4% -lh5- daf6 Oct 15 1999 scale2x-morphos/src/test/basn6a16.png
[generic] 503 1440 34.9% -lh5- 9317 Aug 8 2004 scale2x-morphos/src/test/test.lst
---------- ----------- ------- ------- ------ ---------- ------------ -------------
Total 92 files 398709 1053471 37.8% Jul 18 20:44
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