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‎.gitignore‎

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*.o

‎README.md‎

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# neon_scalers
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Implementation of various scalers with following properties:
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- written in pure assembler
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- uses ARMv7 and NEON instructions
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- uses instruction scheduling for Cortex-A8 processors
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- no checking for corectness of parameters
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- no clipping
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- MIT license
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The scaler function definitions are in the header files in the include directory.<br/>
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Compiled libaries (static and shared) are in the lib directory.
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##Description of scaler function names
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neon_NAME_SP_DP
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where NAME is the scaler name,<br/>
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SP is the number of bits per source pixel,<br/>
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DP is the number of bits per destination pixel
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list of values:<br/>
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NAME: normal1x, normal2x, normal3x, normal4x, scale2x, scale3x, scale4x, eagle2x<br/>
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SP->DP: 8->8, 8->16, 16->16
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##Description of scaler function parameters
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**src**<br/>
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pointer to the first source pixel<br/>
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if bits per source pixel is 16 then src must be aligned to 16 bits (2 bytes)<br/>
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**dst**<br/>
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pointer to the first destination pixel<br/>
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if bits per destination pixel is 16 then dst must be aligned to 16 bits (2 bytes)<br/>
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**palette**<br/>
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pointer to an array of 256 32-bit values<br/>
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upper 16 bits of every value must be zero<br/>
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must be aligned to 32 bits (4 bytes)<br/>
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**width**<br/>
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width of the source image (in pixels)<br/>
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minimum width is 32<br/>
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**srcstride**<br/>
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stride of the source image (in bytes) = distance between two lines in the source image<br/>
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**dststride**<br/>
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stride of the destination image (in bytes) = distance between two lines in the destination image<br/>
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**height**<br/>
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height of the source image<br/>
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minimum height is 3
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##Example
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Scaling 320x200 image (16-bits per pixel) using scale2x to the center of a 800x480 frame
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```c_cpp
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uint16_t src[320*200];
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uint16_t dst[800x480];
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neon_scale2x_16_16(&(src[0]), &(dst[((480 - 2*200) / 2) * 800 + (800 - 320 * 2) / 2]), 320, 320*2, 800*2, 200);
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```

‎benchmark.txt‎

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Benchmarking was done on Pandora at stock speed - 600 MHz
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Benchmark consists of 60000 calls to scaler function with following parameter combinations:
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Source width (pixels): (varying) 305 - 320
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Source height: 240
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Source alignment (modulo 16): (varying) 0 - 15
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Results:
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|Total |Time per |Calls per |Cycles per
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Scaler function |time (s) |call (ms)|second |source pixel
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--------------------|---------|---------|----------|------------
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neon_normal1x_8_8 | 18.524 | 0.309 | 3239.041 | 2.470
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neon_normal1x_16_16 | 40.422 | 0.674 | 1484.340 | 5.390
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neon_normal1x_8_16 | 31.516 | 0.525 | 1903.795 | 4.202
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--------------------|---------|---------|----------|------------
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neon_normal2x_8_8 | 52.414 | 0.874 | 1144.732 | 6.989
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neon_normal2x_16_16 | 101.016 | 1.684 | 593.965 | 13.469
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neon_normal2x_8_16 | 87.836 | 1.464 | 683.091 | 11.711
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--------------------|---------|---------|----------|------------
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neon_normal3x_8_8 | 108.157 | 1.803 | 554.749 | 14.421
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neon_normal3x_16_16 | 211.363 | 3.523 | 283.872 | 28.182
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neon_normal3x_8_16 | 193.407 | 3.223 | 310.227 | 25.788
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--------------------|---------|---------|----------|------------
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neon_normal4x_8_8 | 170.703 | 2.845 | 351.488 | 22.760
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neon_normal4x_16_16 | 322.047 | 5.367 | 186.308 | 42.940
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neon_normal4x_8_16 | 301.430 | 5.024 | 199.051 | 40.191
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--------------------|---------|---------|----------|------------
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neon_scale2x_8_8 | 52.141 | 0.869 | 1150.726 | 6.952
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neon_scale2x_16_16 | 100.641 | 1.677 | 596.178 | 13.419
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neon_scale2x_8_16 | 122.594 | 2.043 | 489.420 | 16.346
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--------------------|---------|---------|----------|------------
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neon_scale3x_8_8 | 129.516 | 2.159 | 463.263 | 17.269
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neon_scale3x_16_16 | 255.836 | 4.264 | 234.525 | 34.111
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neon_scale3x_8_16 | 272.914 | 4.549 | 219.849 | 36.389
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--------------------|---------|---------|----------|------------
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neon_scale4x_8_8 | 217.157 | 3.619 | 276.298 | 28.954
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neon_scale4x_16_16 | 404.563 | 6.743 | 148.308 | 53.942
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neon_scale4x_8_16 | 403.852 | 6.731 | 148.569 | 53.847
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--------------------|---------|---------|----------|------------
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neon_eagle2x_8_8 | 53.368 | 0.889 | 1124.269 | 7.116
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neon_eagle2x_16_16 | 104.555 | 1.743 | 573.861 | 13.941
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neon_eagle2x_8_16 | 123.930 | 2.066 | 484.144 | 16.524
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----------------------------------------------------------------

‎compile.sh‎

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# create static library
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$PNDSDK/bin/arm-none-linux-gnueabi-gcc -Os -pipe -march=armv7-a -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp -std=c99 -Wall -c *.S
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$PNDSDK/bin/arm-none-linux-gnueabi-ar -cqs lib/libneon_scalers.a *.o
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rm *.o
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# create shared library
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$PNDSDK/bin/arm-none-linux-gnueabi-gcc -Os -pipe -march=armv7-a -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp -std=c99 -Wall -fPIC -c *.S
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$PNDSDK/bin/arm-none-linux-gnueabi-gcc -shared -Wl,-soname,libneon_scalers.so.1 -o lib/libneon_scalers.so.1.0 *.o
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ln -sf libneon_scalers.so.1.0 lib/libneon_scalers.so
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ln -sf libneon_scalers.so.1.0 lib/libneon_scalers.so.1
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rm *.o

‎include/neon_eagle2x.h‎

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/**
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*
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* Copyright (C) 2012 Roman Pauer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#if !defined(_NEON_EAGLE2X_H_INCLUDED_)
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#define _NEON_EAGLE2X_H_INCLUDED_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void neon_eagle2x_8_8(const uint8_t *src, uint8_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_eagle2x_16_16(const uint16_t *src, uint16_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_eagle2x_8_16(const uint8_t *src, uint16_t *dst, const uint32_t *palette, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NEON_EAGLE2X_H_INCLUDED_ */

‎include/neon_normal1x.h‎

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/**
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*
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* Copyright (C) 2012 Roman Pauer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#if !defined(_NEON_NORMAL1X_H_INCLUDED_)
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#define _NEON_NORMAL1X_H_INCLUDED_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void neon_normal1x_8_8(const uint8_t *src, uint8_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal1x_16_16(const uint16_t *src, uint16_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal1x_8_16(const uint8_t *src, uint16_t *dst, const uint32_t *palette, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NEON_NORMAL1X_H_INCLUDED_ */

‎include/neon_normal2x.h‎

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/**
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*
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* Copyright (C) 2012 Roman Pauer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#if !defined(_NEON_NORMAL2X_H_INCLUDED_)
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#define _NEON_NORMAL2X_H_INCLUDED_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void neon_normal2x_8_8(const uint8_t *src, uint8_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal2x_16_16(const uint16_t *src, uint16_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal2x_8_16(const uint8_t *src, uint16_t *dst, const uint32_t *palette, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NEON_NORMAL2X_H_INCLUDED_ */

‎include/neon_normal3x.h‎

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/**
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*
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* Copyright (C) 2012 Roman Pauer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#if !defined(_NEON_NORMAL3X_H_INCLUDED_)
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#define _NEON_NORMAL3X_H_INCLUDED_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void neon_normal3x_8_8(const uint8_t *src, uint8_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal3x_16_16(const uint16_t *src, uint16_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal3x_8_16(const uint8_t *src, uint16_t *dst, const uint32_t *palette, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NEON_NORMAL3X_H_INCLUDED_ */

‎include/neon_normal4x.h‎

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/**
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*
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* Copyright (C) 2012 Roman Pauer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#if !defined(_NEON_NORMAL4X_H_INCLUDED_)
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#define _NEON_NORMAL4X_H_INCLUDED_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void neon_normal4x_8_8(const uint8_t *src, uint8_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal4x_16_16(const uint16_t *src, uint16_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_normal4x_8_16(const uint8_t *src, uint16_t *dst, const uint32_t *palette, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NEON_NORMAL4X_H_INCLUDED_ */

‎include/neon_scale2x.h‎

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/**
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*
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* Copyright (C) 2012 Roman Pauer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#if !defined(_NEON_SCALE2X_H_INCLUDED_)
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#define _NEON_SCALE2X_H_INCLUDED_
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void neon_scale2x_8_8(const uint8_t *src, uint8_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_scale2x_16_16(const uint16_t *src, uint16_t *dst, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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extern void neon_scale2x_8_16(const uint8_t *src, uint16_t *dst, const uint32_t *palette, unsigned int width, unsigned int srcstride, unsigned int dststride, unsigned int height);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _NEON_SCALE2X_H_INCLUDED_ */

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