mirror of https://github.com/fltk/fltk
Add files needed when building libpng for the arm64 architecture.
These files can be compiled-in for other architectures but produce no binary code.
This commit is contained in:
ManoloFLTK
parent
1da349579d
commit
93f19c3a24
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@ -31,6 +31,9 @@ set(PNG_SRCS
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pngwrite.c
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pngwtran.c
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pngwutil.c
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arm/arm_init.c
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arm/filter_neon_intrinsics.c
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arm/palette_neon_intrinsics.c
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)
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#######################################################################
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@ -23,7 +23,8 @@ include ../makeinclude
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OBJS = png.o pngset.o pngget.o pngrutil.o pngtrans.o pngwutil.o \
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pngread.o pngrio.o pngwio.o pngwrite.o pngrtran.o \
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pngwtran.o pngmem.o pngerror.o pngpread.o
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pngwtran.o pngmem.o pngerror.o pngpread.o \
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arm/arm_init.o arm/filter_neon_intrinsics.o arm/palette_neon_intrinsics.o
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LIBPNG = ../lib/libfltk_png$(LIBEXT)
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@ -0,0 +1,136 @@
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/* arm_init.c - NEON optimised filter functions
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*
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* Copyright (c) 2018 Cosmin Truta
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* Copyright (c) 2014,2016 Glenn Randers-Pehrson
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* Written by Mans Rullgard, 2011.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*/
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/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
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* called.
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*/
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#define _POSIX_SOURCE 1
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#include "../pngpriv.h"
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#ifdef PNG_READ_SUPPORTED
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#if PNG_ARM_NEON_OPT > 0
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#ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
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/* WARNING: it is strongly recommended that you do not build libpng with
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* run-time checks for CPU features if at all possible. In the case of the ARM
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* NEON instructions there is no processor-specific way of detecting the
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* presence of the required support, therefore run-time detection is extremely
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* OS specific.
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*
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* You may set the macro PNG_ARM_NEON_FILE to the file name of file containing
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* a fragment of C source code which defines the png_have_neon function. There
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* are a number of implementations in contrib/arm-neon, but the only one that
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* has partial support is contrib/arm-neon/linux.c - a generic Linux
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* implementation which reads /proc/cpufino.
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*/
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#ifndef PNG_ARM_NEON_FILE
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# ifdef __linux__
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# define PNG_ARM_NEON_FILE "contrib/arm-neon/linux.c"
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# endif
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#endif
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#ifdef PNG_ARM_NEON_FILE
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#include <signal.h> /* for sig_atomic_t */
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static int png_have_neon(png_structp png_ptr);
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#include PNG_ARM_NEON_FILE
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#else /* PNG_ARM_NEON_FILE */
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# error "PNG_ARM_NEON_FILE undefined: no support for run-time ARM NEON checks"
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#endif /* PNG_ARM_NEON_FILE */
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#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
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#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
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# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
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#endif
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void
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png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
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{
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/* The switch statement is compiled in for ARM_NEON_API, the call to
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* png_have_neon is compiled in for ARM_NEON_CHECK. If both are defined
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* the check is only performed if the API has not set the NEON option on
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* or off explicitly. In this case the check controls what happens.
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*
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* If the CHECK is not compiled in and the option is UNSET the behavior prior
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* to 1.6.7 was to use the NEON code - this was a bug caused by having the
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* wrong order of the 'ON' and 'default' cases. UNSET now defaults to OFF,
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* as documented in png.h
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*/
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png_debug(1, "in png_init_filter_functions_neon");
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#ifdef PNG_ARM_NEON_API_SUPPORTED
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switch ((pp->options >> PNG_ARM_NEON) & 3)
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{
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case PNG_OPTION_UNSET:
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/* Allow the run-time check to execute if it has been enabled -
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* thus both API and CHECK can be turned on. If it isn't supported
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* this case will fall through to the 'default' below, which just
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* returns.
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*/
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#endif /* PNG_ARM_NEON_API_SUPPORTED */
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#ifdef PNG_ARM_NEON_CHECK_SUPPORTED
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{
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static volatile sig_atomic_t no_neon = -1; /* not checked */
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if (no_neon < 0)
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no_neon = !png_have_neon(pp);
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if (no_neon)
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return;
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}
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#ifdef PNG_ARM_NEON_API_SUPPORTED
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break;
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#endif
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#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
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#ifdef PNG_ARM_NEON_API_SUPPORTED
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default: /* OFF or INVALID */
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return;
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case PNG_OPTION_ON:
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/* Option turned on */
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break;
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}
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#endif
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/* IMPORTANT: any new external functions used here must be declared using
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* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
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* 'prefix' option to configure works:
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*
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* ./configure --with-libpng-prefix=foobar_
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*
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* Verify you have got this right by running the above command, doing a build
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* and examining pngprefix.h; it must contain a #define for every external
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* function you add. (Notice that this happens automatically for the
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* initialization function.)
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*/
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pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
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if (bpp == 3)
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{
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pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
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pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
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pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
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png_read_filter_row_paeth3_neon;
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}
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else if (bpp == 4)
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{
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pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
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pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
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pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
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png_read_filter_row_paeth4_neon;
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}
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}
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#endif /* PNG_ARM_NEON_OPT > 0 */
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#endif /* READ */
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@ -0,0 +1,402 @@
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/* filter_neon_intrinsics.c - NEON optimised filter functions
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*
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* Copyright (c) 2018 Cosmin Truta
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* Copyright (c) 2014,2016 Glenn Randers-Pehrson
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* Written by James Yu <james.yu at linaro.org>, October 2013.
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* Based on filter_neon.S, written by Mans Rullgard, 2011.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*/
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#include "../pngpriv.h"
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#ifdef PNG_READ_SUPPORTED
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/* This code requires -mfpu=neon on the command line: */
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#if PNG_ARM_NEON_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
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#if defined(_MSC_VER) && defined(_M_ARM64)
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# include <arm64_neon.h>
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#else
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# include <arm_neon.h>
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#endif
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/* libpng row pointers are not necessarily aligned to any particular boundary,
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* however this code will only work with appropriate alignment. arm/arm_init.c
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* checks for this (and will not compile unless it is done). This code uses
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* variants of png_aligncast to avoid compiler warnings.
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*/
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#define png_ptr(type,pointer) png_aligncast(type *,pointer)
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#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer)
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/* The following relies on a variable 'temp_pointer' being declared with type
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* 'type'. This is written this way just to hide the GCC strict aliasing
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* warning; note that the code is safe because there never is an alias between
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* the input and output pointers.
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*
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* When compiling with MSVC ARM64, the png_ldr macro can't be passed directly
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* to vst4_lane_u32, because of an internal compiler error inside MSVC.
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* To avoid this compiler bug, we use a temporary variable (vdest_val) to store
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* the result of png_ldr.
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*/
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#define png_ldr(type,pointer)\
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(temp_pointer = png_ptr(type,pointer), *temp_pointer)
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#if PNG_ARM_NEON_OPT > 0
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void
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png_read_filter_row_up_neon(png_row_infop row_info, png_bytep row,
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png_const_bytep prev_row)
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{
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png_bytep rp = row;
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png_bytep rp_stop = row + row_info->rowbytes;
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png_const_bytep pp = prev_row;
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png_debug(1, "in png_read_filter_row_up_neon");
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for (; rp < rp_stop; rp += 16, pp += 16)
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{
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uint8x16_t qrp, qpp;
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qrp = vld1q_u8(rp);
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qpp = vld1q_u8(pp);
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qrp = vaddq_u8(qrp, qpp);
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vst1q_u8(rp, qrp);
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}
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}
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void
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png_read_filter_row_sub3_neon(png_row_infop row_info, png_bytep row,
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png_const_bytep prev_row)
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{
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png_bytep rp = row;
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png_bytep rp_stop = row + row_info->rowbytes;
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uint8x16_t vtmp = vld1q_u8(rp);
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uint8x8x2_t *vrpt = png_ptr(uint8x8x2_t, &vtmp);
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uint8x8x2_t vrp = *vrpt;
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uint8x8x4_t vdest;
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vdest.val[3] = vdup_n_u8(0);
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png_debug(1, "in png_read_filter_row_sub3_neon");
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for (; rp < rp_stop;)
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{
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uint8x8_t vtmp1, vtmp2;
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uint32x2_t *temp_pointer;
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vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
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vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
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vtmp2 = vext_u8(vrp.val[0], vrp.val[1], 6);
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vdest.val[1] = vadd_u8(vdest.val[0], vtmp1);
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vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
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vdest.val[2] = vadd_u8(vdest.val[1], vtmp2);
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vdest.val[3] = vadd_u8(vdest.val[2], vtmp1);
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vtmp = vld1q_u8(rp + 12);
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vrpt = png_ptr(uint8x8x2_t, &vtmp);
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vrp = *vrpt;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
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rp += 3;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
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rp += 3;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
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rp += 3;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
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rp += 3;
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}
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PNG_UNUSED(prev_row)
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}
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void
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png_read_filter_row_sub4_neon(png_row_infop row_info, png_bytep row,
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png_const_bytep prev_row)
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{
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png_bytep rp = row;
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png_bytep rp_stop = row + row_info->rowbytes;
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uint8x8x4_t vdest;
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vdest.val[3] = vdup_n_u8(0);
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png_debug(1, "in png_read_filter_row_sub4_neon");
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for (; rp < rp_stop; rp += 16)
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{
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uint32x2x4_t vtmp = vld4_u32(png_ptr(uint32_t,rp));
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uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp);
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uint8x8x4_t vrp = *vrpt;
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uint32x2x4_t *temp_pointer;
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uint32x2x4_t vdest_val;
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vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
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vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]);
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vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]);
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vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]);
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vdest_val = png_ldr(uint32x2x4_t, &vdest);
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vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
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}
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PNG_UNUSED(prev_row)
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}
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void
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png_read_filter_row_avg3_neon(png_row_infop row_info, png_bytep row,
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png_const_bytep prev_row)
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{
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png_bytep rp = row;
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png_const_bytep pp = prev_row;
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png_bytep rp_stop = row + row_info->rowbytes;
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uint8x16_t vtmp;
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uint8x8x2_t *vrpt;
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uint8x8x2_t vrp;
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uint8x8x4_t vdest;
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vdest.val[3] = vdup_n_u8(0);
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vtmp = vld1q_u8(rp);
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vrpt = png_ptr(uint8x8x2_t,&vtmp);
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vrp = *vrpt;
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png_debug(1, "in png_read_filter_row_avg3_neon");
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for (; rp < rp_stop; pp += 12)
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{
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uint8x8_t vtmp1, vtmp2, vtmp3;
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uint8x8x2_t *vppt;
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uint8x8x2_t vpp;
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uint32x2_t *temp_pointer;
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vtmp = vld1q_u8(pp);
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vppt = png_ptr(uint8x8x2_t,&vtmp);
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vpp = *vppt;
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vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
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vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
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vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
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vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
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vtmp3 = vext_u8(vrp.val[0], vrp.val[1], 6);
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vdest.val[1] = vhadd_u8(vdest.val[0], vtmp2);
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vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
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vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 6);
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vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
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vtmp = vld1q_u8(rp + 12);
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vrpt = png_ptr(uint8x8x2_t,&vtmp);
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vrp = *vrpt;
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vdest.val[2] = vhadd_u8(vdest.val[1], vtmp2);
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vdest.val[2] = vadd_u8(vdest.val[2], vtmp3);
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vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
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vdest.val[3] = vhadd_u8(vdest.val[2], vtmp2);
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vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
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rp += 3;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
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rp += 3;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
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rp += 3;
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vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
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rp += 3;
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}
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}
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void
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png_read_filter_row_avg4_neon(png_row_infop row_info, png_bytep row,
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png_const_bytep prev_row)
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{
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png_bytep rp = row;
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png_bytep rp_stop = row + row_info->rowbytes;
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png_const_bytep pp = prev_row;
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uint8x8x4_t vdest;
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vdest.val[3] = vdup_n_u8(0);
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png_debug(1, "in png_read_filter_row_avg4_neon");
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for (; rp < rp_stop; rp += 16, pp += 16)
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{
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uint32x2x4_t vtmp;
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uint8x8x4_t *vrpt, *vppt;
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uint8x8x4_t vrp, vpp;
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uint32x2x4_t *temp_pointer;
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uint32x2x4_t vdest_val;
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vtmp = vld4_u32(png_ptr(uint32_t,rp));
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vrpt = png_ptr(uint8x8x4_t,&vtmp);
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vrp = *vrpt;
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vtmp = vld4_u32(png_ptrc(uint32_t,pp));
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vppt = png_ptr(uint8x8x4_t,&vtmp);
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vpp = *vppt;
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vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
|
||||
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
|
||||
vdest.val[1] = vhadd_u8(vdest.val[0], vpp.val[1]);
|
||||
vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
|
||||
vdest.val[2] = vhadd_u8(vdest.val[1], vpp.val[2]);
|
||||
vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
|
||||
vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]);
|
||||
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
|
||||
|
||||
vdest_val = png_ldr(uint32x2x4_t, &vdest);
|
||||
vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
|
||||
}
|
||||
}
|
||||
|
||||
static uint8x8_t
|
||||
paeth(uint8x8_t a, uint8x8_t b, uint8x8_t c)
|
||||
{
|
||||
uint8x8_t d, e;
|
||||
uint16x8_t p1, pa, pb, pc;
|
||||
|
||||
p1 = vaddl_u8(a, b); /* a + b */
|
||||
pc = vaddl_u8(c, c); /* c * 2 */
|
||||
pa = vabdl_u8(b, c); /* pa */
|
||||
pb = vabdl_u8(a, c); /* pb */
|
||||
pc = vabdq_u16(p1, pc); /* pc */
|
||||
|
||||
p1 = vcleq_u16(pa, pb); /* pa <= pb */
|
||||
pa = vcleq_u16(pa, pc); /* pa <= pc */
|
||||
pb = vcleq_u16(pb, pc); /* pb <= pc */
|
||||
|
||||
p1 = vandq_u16(p1, pa); /* pa <= pb && pa <= pc */
|
||||
|
||||
d = vmovn_u16(pb);
|
||||
e = vmovn_u16(p1);
|
||||
|
||||
d = vbsl_u8(d, b, c);
|
||||
e = vbsl_u8(e, a, d);
|
||||
|
||||
return e;
|
||||
}
|
||||
|
||||
void
|
||||
png_read_filter_row_paeth3_neon(png_row_infop row_info, png_bytep row,
|
||||
png_const_bytep prev_row)
|
||||
{
|
||||
png_bytep rp = row;
|
||||
png_const_bytep pp = prev_row;
|
||||
png_bytep rp_stop = row + row_info->rowbytes;
|
||||
|
||||
uint8x16_t vtmp;
|
||||
uint8x8x2_t *vrpt;
|
||||
uint8x8x2_t vrp;
|
||||
uint8x8_t vlast = vdup_n_u8(0);
|
||||
uint8x8x4_t vdest;
|
||||
vdest.val[3] = vdup_n_u8(0);
|
||||
|
||||
vtmp = vld1q_u8(rp);
|
||||
vrpt = png_ptr(uint8x8x2_t,&vtmp);
|
||||
vrp = *vrpt;
|
||||
|
||||
png_debug(1, "in png_read_filter_row_paeth3_neon");
|
||||
|
||||
for (; rp < rp_stop; pp += 12)
|
||||
{
|
||||
uint8x8x2_t *vppt;
|
||||
uint8x8x2_t vpp;
|
||||
uint8x8_t vtmp1, vtmp2, vtmp3;
|
||||
uint32x2_t *temp_pointer;
|
||||
|
||||
vtmp = vld1q_u8(pp);
|
||||
vppt = png_ptr(uint8x8x2_t,&vtmp);
|
||||
vpp = *vppt;
|
||||
|
||||
vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
|
||||
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
|
||||
|
||||
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
|
||||
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
|
||||
vdest.val[1] = paeth(vdest.val[0], vtmp2, vpp.val[0]);
|
||||
vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
|
||||
|
||||
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 6);
|
||||
vtmp3 = vext_u8(vpp.val[0], vpp.val[1], 6);
|
||||
vdest.val[2] = paeth(vdest.val[1], vtmp3, vtmp2);
|
||||
vdest.val[2] = vadd_u8(vdest.val[2], vtmp1);
|
||||
|
||||
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
|
||||
vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
|
||||
|
||||
vtmp = vld1q_u8(rp + 12);
|
||||
vrpt = png_ptr(uint8x8x2_t,&vtmp);
|
||||
vrp = *vrpt;
|
||||
|
||||
vdest.val[3] = paeth(vdest.val[2], vtmp2, vtmp3);
|
||||
vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
|
||||
|
||||
vlast = vtmp2;
|
||||
|
||||
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
|
||||
rp += 3;
|
||||
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
|
||||
rp += 3;
|
||||
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
|
||||
rp += 3;
|
||||
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
|
||||
rp += 3;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
png_read_filter_row_paeth4_neon(png_row_infop row_info, png_bytep row,
|
||||
png_const_bytep prev_row)
|
||||
{
|
||||
png_bytep rp = row;
|
||||
png_bytep rp_stop = row + row_info->rowbytes;
|
||||
png_const_bytep pp = prev_row;
|
||||
|
||||
uint8x8_t vlast = vdup_n_u8(0);
|
||||
uint8x8x4_t vdest;
|
||||
vdest.val[3] = vdup_n_u8(0);
|
||||
|
||||
png_debug(1, "in png_read_filter_row_paeth4_neon");
|
||||
|
||||
for (; rp < rp_stop; rp += 16, pp += 16)
|
||||
{
|
||||
uint32x2x4_t vtmp;
|
||||
uint8x8x4_t *vrpt, *vppt;
|
||||
uint8x8x4_t vrp, vpp;
|
||||
uint32x2x4_t *temp_pointer;
|
||||
uint32x2x4_t vdest_val;
|
||||
|
||||
vtmp = vld4_u32(png_ptr(uint32_t,rp));
|
||||
vrpt = png_ptr(uint8x8x4_t,&vtmp);
|
||||
vrp = *vrpt;
|
||||
vtmp = vld4_u32(png_ptrc(uint32_t,pp));
|
||||
vppt = png_ptr(uint8x8x4_t,&vtmp);
|
||||
vpp = *vppt;
|
||||
|
||||
vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
|
||||
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
|
||||
vdest.val[1] = paeth(vdest.val[0], vpp.val[1], vpp.val[0]);
|
||||
vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
|
||||
vdest.val[2] = paeth(vdest.val[1], vpp.val[2], vpp.val[1]);
|
||||
vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
|
||||
vdest.val[3] = paeth(vdest.val[2], vpp.val[3], vpp.val[2]);
|
||||
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
|
||||
|
||||
vlast = vpp.val[3];
|
||||
|
||||
vdest_val = png_ldr(uint32x2x4_t, &vdest);
|
||||
vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0);
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* PNG_ARM_NEON_OPT > 0 */
|
||||
#endif /* PNG_ARM_NEON_IMPLEMENTATION == 1 (intrinsics) */
|
||||
#endif /* READ */
|
||||
|
|
@ -0,0 +1,149 @@
|
|||
|
||||
/* palette_neon_intrinsics.c - NEON optimised palette expansion functions
|
||||
*
|
||||
* Copyright (c) 2018-2019 Cosmin Truta
|
||||
* Copyright (c) 2017-2018 Arm Holdings. All rights reserved.
|
||||
* Written by Richard Townsend <Richard.Townsend@arm.com>, February 2017.
|
||||
*
|
||||
* This code is released under the libpng license.
|
||||
* For conditions of distribution and use, see the disclaimer
|
||||
* and license in png.h
|
||||
*/
|
||||
|
||||
#include "../pngpriv.h"
|
||||
|
||||
#if PNG_ARM_NEON_IMPLEMENTATION == 1
|
||||
|
||||
#if defined(_MSC_VER) && defined(_M_ARM64)
|
||||
# include <arm64_neon.h>
|
||||
#else
|
||||
# include <arm_neon.h>
|
||||
#endif
|
||||
|
||||
/* Build an RGBA8 palette from the separate RGB and alpha palettes. */
|
||||
void
|
||||
png_riffle_palette_neon(png_structrp png_ptr)
|
||||
{
|
||||
png_const_colorp palette = png_ptr->palette;
|
||||
png_bytep riffled_palette = png_ptr->riffled_palette;
|
||||
png_const_bytep trans_alpha = png_ptr->trans_alpha;
|
||||
int num_trans = png_ptr->num_trans;
|
||||
int i;
|
||||
|
||||
png_debug(1, "in png_riffle_palette_neon");
|
||||
|
||||
/* Initially black, opaque. */
|
||||
uint8x16x4_t w = {{
|
||||
vdupq_n_u8(0x00),
|
||||
vdupq_n_u8(0x00),
|
||||
vdupq_n_u8(0x00),
|
||||
vdupq_n_u8(0xff),
|
||||
}};
|
||||
|
||||
/* First, riffle the RGB colours into an RGBA8 palette.
|
||||
* The alpha component is set to opaque for now.
|
||||
*/
|
||||
for (i = 0; i < 256; i += 16)
|
||||
{
|
||||
uint8x16x3_t v = vld3q_u8((png_const_bytep)(palette + i));
|
||||
w.val[0] = v.val[0];
|
||||
w.val[1] = v.val[1];
|
||||
w.val[2] = v.val[2];
|
||||
vst4q_u8(riffled_palette + (i << 2), w);
|
||||
}
|
||||
|
||||
/* Fix up the missing transparency values. */
|
||||
for (i = 0; i < num_trans; i++)
|
||||
riffled_palette[(i << 2) + 3] = trans_alpha[i];
|
||||
}
|
||||
|
||||
/* Expands a palettized row into RGBA8. */
|
||||
int
|
||||
png_do_expand_palette_rgba8_neon(png_structrp png_ptr, png_row_infop row_info,
|
||||
png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
|
||||
{
|
||||
png_uint_32 row_width = row_info->width;
|
||||
const png_uint_32 *riffled_palette =
|
||||
(const png_uint_32 *)png_ptr->riffled_palette;
|
||||
const png_int_32 pixels_per_chunk = 4;
|
||||
int i;
|
||||
|
||||
png_debug(1, "in png_do_expand_palette_rgba8_neon");
|
||||
|
||||
if (row_width < pixels_per_chunk)
|
||||
return 0;
|
||||
|
||||
/* This function originally gets the last byte of the output row.
|
||||
* The NEON part writes forward from a given position, so we have
|
||||
* to seek this back by 4 pixels x 4 bytes.
|
||||
*/
|
||||
*ddp = *ddp - ((pixels_per_chunk * sizeof(png_uint_32)) - 1);
|
||||
|
||||
for (i = 0; i < row_width; i += pixels_per_chunk)
|
||||
{
|
||||
uint32x4_t cur;
|
||||
png_bytep sp = *ssp - i, dp = *ddp - (i << 2);
|
||||
cur = vld1q_dup_u32 (riffled_palette + *(sp - 3));
|
||||
cur = vld1q_lane_u32(riffled_palette + *(sp - 2), cur, 1);
|
||||
cur = vld1q_lane_u32(riffled_palette + *(sp - 1), cur, 2);
|
||||
cur = vld1q_lane_u32(riffled_palette + *(sp - 0), cur, 3);
|
||||
vst1q_u32((void *)dp, cur);
|
||||
}
|
||||
if (i != row_width)
|
||||
{
|
||||
/* Remove the amount that wasn't processed. */
|
||||
i -= pixels_per_chunk;
|
||||
}
|
||||
|
||||
/* Decrement output pointers. */
|
||||
*ssp = *ssp - i;
|
||||
*ddp = *ddp - (i << 2);
|
||||
return i;
|
||||
}
|
||||
|
||||
/* Expands a palettized row into RGB8. */
|
||||
int
|
||||
png_do_expand_palette_rgb8_neon(png_structrp png_ptr, png_row_infop row_info,
|
||||
png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
|
||||
{
|
||||
png_uint_32 row_width = row_info->width;
|
||||
png_const_bytep palette = (png_const_bytep)png_ptr->palette;
|
||||
const png_uint_32 pixels_per_chunk = 8;
|
||||
int i;
|
||||
|
||||
png_debug(1, "in png_do_expand_palette_rgb8_neon");
|
||||
|
||||
if (row_width <= pixels_per_chunk)
|
||||
return 0;
|
||||
|
||||
/* Seeking this back by 8 pixels x 3 bytes. */
|
||||
*ddp = *ddp - ((pixels_per_chunk * sizeof(png_color)) - 1);
|
||||
|
||||
for (i = 0; i < row_width; i += pixels_per_chunk)
|
||||
{
|
||||
uint8x8x3_t cur;
|
||||
png_bytep sp = *ssp - i, dp = *ddp - ((i << 1) + i);
|
||||
cur = vld3_dup_u8(palette + sizeof(png_color) * (*(sp - 7)));
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 6)), cur, 1);
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 5)), cur, 2);
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 4)), cur, 3);
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 3)), cur, 4);
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 2)), cur, 5);
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 1)), cur, 6);
|
||||
cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 0)), cur, 7);
|
||||
vst3_u8((void *)dp, cur);
|
||||
}
|
||||
|
||||
if (i != row_width)
|
||||
{
|
||||
/* Remove the amount that wasn't processed. */
|
||||
i -= pixels_per_chunk;
|
||||
}
|
||||
|
||||
/* Decrement output pointers. */
|
||||
*ssp = *ssp - i;
|
||||
*ddp = *ddp - ((i << 1) + i);
|
||||
return i;
|
||||
}
|
||||
|
||||
#endif /* PNG_ARM_NEON_IMPLEMENTATION */
|
||||
Loading…
Reference in New Issue