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Fix a memory leak in the riffled palette optimization on ARM; refactor

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Move deallocation of riffled_palette from png_write_destroy to
png_read_destroy. The reader (not the writer) is the owner of
riffled_palette.

Move allocation and initialization of riffled_palette from
png_do_read_transformations to png_init_palette_transformations.

Allow riffled_palette inside png_struct only if the ARM Neon
optimizations are enabled.

Rename png_riffle_palette_rgba to png_riffle_palette_rgba8, etc.,
to better indicate the strict applicability of these routines.

Fix an unused parameter warning in the build configurations where
riffled palette optimization is not enabled.

Fix indentation.
This commit is contained in:
Cosmin Truta 2019-02-03 19:51:18 -05:00
parent 0a882b5787
commit 70d122aac4
6 changed files with 67 additions and 65 deletions
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26
arm/palette_neon_intrinsics.c
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@ -1,7 +1,7 @@
/* palette_neon_intrinsics.c - NEON optimised palette expansion functions
*
* Copyright (c) 2018 Cosmin Truta
* 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.
*
@ -20,9 +20,9 @@
# include <arm_neon.h>
#endif
/* Build an RGBA palette from the RGB and separate alpha palettes. */
/* Build an RGBA8 palette from the separate RGB and alpha palettes. */
void
png_riffle_palette_rgba(png_structrp png_ptr, png_row_infop row_info)
png_riffle_palette_rgba8(png_structrp png_ptr)
{
png_const_colorp palette = png_ptr->palette;
png_bytep riffled_palette = png_ptr->riffled_palette;
@ -38,16 +38,10 @@ png_riffle_palette_rgba(png_structrp png_ptr, png_row_infop row_info)
vdupq_n_u8(0xff),
}};
if (row_info->bit_depth != 8)
{
png_error(png_ptr, "bit_depth must be 8 for png_riffle_palette_rgba");
return;
}
/* First, riffle the RGB colours into a RGBA palette, the A value is
* set to opaque for now.
/* First, riffle the RGB colours into an RGBA8 palette.
* The alpha component is set to opaque for now.
*/
for (i = 0; i < (1 << row_info->bit_depth); i += 16)
for (i = 0; i < 256; i += 16)
{
uint8x16x3_t v = vld3q_u8((png_const_bytep)(palette + i));
w.val[0] = v.val[0];
@ -61,9 +55,9 @@ png_riffle_palette_rgba(png_structrp png_ptr, png_row_infop row_info)
riffled_palette[(i << 2) + 3] = trans_alpha[i];
}
/* Expands a palettized row into RGBA. */
/* Expands a palettized row into RGBA8. */
int
png_do_expand_palette_neon_rgba(png_structrp png_ptr, png_row_infop row_info,
png_do_expand_palette_neon_rgba8(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;
@ -103,9 +97,9 @@ png_do_expand_palette_neon_rgba(png_structrp png_ptr, png_row_infop row_info,
return i;
}
/* Expands a palettized row into RGB format. */
/* Expands a palettized row into RGB8. */
int
png_do_expand_palette_neon_rgb(png_structrp png_ptr, png_row_infop row_info,
png_do_expand_palette_neon_rgb8(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;

10
pngpriv.h
View File

@ -1,7 +1,7 @@
/* pngpriv.h - private declarations for use inside libpng
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2018-2019 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@ -2119,11 +2119,11 @@ PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,
#if PNG_ARM_NEON_IMPLEMENTATION == 1
PNG_INTERNAL_FUNCTION(void,
png_riffle_palette_rgba,
(png_structrp, png_row_infop),
png_riffle_palette_rgba8,
(png_structrp),
PNG_EMPTY);
PNG_INTERNAL_FUNCTION(int,
png_do_expand_palette_neon_rgba,
png_do_expand_palette_neon_rgba8,
(png_structrp,
png_row_infop,
png_const_bytep,
@ -2131,7 +2131,7 @@ PNG_INTERNAL_FUNCTION(int,
const png_bytepp),
PNG_EMPTY);
PNG_INTERNAL_FUNCTION(int,
png_do_expand_palette_neon_rgb,
png_do_expand_palette_neon_rgb8,
(png_structrp,
png_row_infop,
png_const_bytep,

8
pngread.c
View File

@ -1,7 +1,7 @@
/* pngread.c - read a PNG file
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2018-2019 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@ -994,6 +994,12 @@ png_read_destroy(png_structrp png_ptr)
png_ptr->chunk_list = NULL;
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED) && \
defined(PNG_ARM_NEON_IMPLEMENTATION)
png_free(png_ptr, png_ptr->riffled_palette);
png_ptr->riffled_palette = NULL;
#endif
/* NOTE: the 'setjmp' buffer may still be allocated and the memory and error
* callbacks are still set at this point. They are required to complete the
* destruction of the png_struct itself.

70
pngrtran.c
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@ -1,7 +1,7 @@
/* pngrtran.c - transforms the data in a row for PNG readers
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2018-2019 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@ -1161,7 +1161,20 @@ png_init_palette_transformations(png_structrp png_ptr)
png_ptr->transformations &= ~(PNG_COMPOSE | PNG_BACKGROUND_EXPAND);
}
#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
#ifdef PNG_READ_EXPAND_SUPPORTED
#ifdef PNG_ARM_NEON_INTRINSICS_AVAILABLE
/* Initialize the accelerated palette expansion, if applicable. */
if ((png_ptr->transformations & PNG_EXPAND) != 0)
{
if ((png_ptr->num_trans > 0) && (png_ptr->bit_depth == 8))
{
png_ptr->riffled_palette = (png_bytep)png_malloc(png_ptr, 256 * 4);
png_riffle_palette_rgba8(png_ptr);
}
}
#endif /* PNG_ARM_NEON_INTRINSICS_AVAILABLE */
#ifdef PNG_READ_BACKGROUND_SUPPORTED
/* png_set_background handling - deals with the complexity of whether the
* background color is in the file format or the screen format in the case
* where an 'expand' will happen.
@ -1182,24 +1195,25 @@ png_init_palette_transformations(png_structrp png_ptr)
png_ptr->palette[png_ptr->background.index].blue;
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
{
if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
{
/* Invert the alpha channel (in tRNS) unless the pixels are
* going to be expanded, in which case leave it for later
*/
int i, istop = png_ptr->num_trans;
if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0)
{
if ((png_ptr->transformations & PNG_EXPAND_tRNS) == 0)
{
/* Invert the alpha channel (in tRNS) unless the pixels are
* going to be expanded, in which case leave it for later
*/
int i, istop = png_ptr->num_trans;
for (i=0; i<istop; i++)
png_ptr->trans_alpha[i] = (png_byte)(255 -
png_ptr->trans_alpha[i]);
}
}
for (i = 0; i < istop; i++)
png_ptr->trans_alpha[i] =
(png_byte)(255 - png_ptr->trans_alpha[i]);
}
}
#endif /* READ_INVERT_ALPHA */
}
} /* background expand and (therefore) no alpha association. */
#endif /* READ_EXPAND && READ_BACKGROUND */
#endif /* READ_BACKGROUND */
#endif /* READ_EXPAND */
}
static void /* PRIVATE */
@ -4320,9 +4334,11 @@ png_do_expand_palette(png_structrp png_ptr, png_row_infop row_info,
* but sometimes row_info->bit_depth has been changed to 8.
* In these cases, the palette hasn't been riffled.
*/
i = png_do_expand_palette_neon_rgba(png_ptr, row_info, row,
i = png_do_expand_palette_neon_rgba8(png_ptr, row_info, row,
&sp, &dp);
}
#else
PNG_UNUSED(png_ptr)
#endif
for (; i < row_width; i++)
@ -4349,8 +4365,10 @@ png_do_expand_palette(png_structrp png_ptr, png_row_infop row_info,
dp = row + (size_t)(row_width * 3) - 1;
i = 0;
#ifdef PNG_ARM_NEON_INTRINSICS_AVAILABLE
i = png_do_expand_palette_neon_rgb(png_ptr, row_info, row,
i = png_do_expand_palette_neon_rgb8(png_ptr, row_info, row,
&sp, &dp);
#else
PNG_UNUSED(png_ptr)
#endif
for (; i < row_width; i++)
@ -4767,22 +4785,8 @@ png_do_read_transformations(png_structrp png_ptr, png_row_infop row_info)
{
if (row_info->color_type == PNG_COLOR_TYPE_PALETTE)
{
#ifdef PNG_ARM_NEON_INTRINSICS_AVAILABLE
if ((png_ptr->num_trans > 0) && (png_ptr->bit_depth == 8))
{
/* Allocate space for the decompressed full palette. */
if (png_ptr->riffled_palette == NULL)
{
png_ptr->riffled_palette = png_malloc(png_ptr, 256*4);
if (png_ptr->riffled_palette == NULL)
png_error(png_ptr, "NULL row buffer");
/* Build the RGBA palette. */
png_riffle_palette_rgba(png_ptr, row_info);
}
}
#endif
png_do_expand_palette(png_ptr, row_info, png_ptr->row_buf + 1,
png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
png_ptr->palette, png_ptr->trans_alpha, png_ptr->num_trans);
}
else

12
pngstruct.h
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@ -1,7 +1,7 @@
/* pngstruct.h - header file for PNG reference library
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2018-2019 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@ -228,10 +228,6 @@ struct png_struct_def
* big_row_buf; while writing it is separately
* allocated.
*/
#ifdef PNG_READ_EXPAND_SUPPORTED
/* Buffer to accelerate palette transformations. */
png_bytep riffled_palette;
#endif
#ifdef PNG_WRITE_FILTER_SUPPORTED
png_bytep try_row; /* buffer to save trial row when filtering */
png_bytep tst_row; /* buffer to save best trial row when filtering */
@ -396,6 +392,12 @@ struct png_struct_def
/* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
#endif
/* New member added in libpng-1.6.36 */
#if defined(PNG_READ_EXPAND_SUPPORTED) && \
defined(PNG_ARM_NEON_IMPLEMENTATION)
png_bytep riffled_palette; /* buffer for accelerated palette expansion */
#endif
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
#if defined(PNG_MNG_FEATURES_SUPPORTED)
/* Changed from png_byte to png_uint_32 at version 1.2.0 */

6
pngwrite.c
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@ -1,7 +1,7 @@
/* pngwrite.c - general routines to write a PNG file
*
* Copyright (c) 2018 Cosmin Truta
* Copyright (c) 2018-2019 Cosmin Truta
* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
* Copyright (c) 1996-1997 Andreas Dilger
* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
@ -948,10 +948,6 @@ png_write_destroy(png_structrp png_ptr)
png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list);
png_free(png_ptr, png_ptr->row_buf);
png_ptr->row_buf = NULL;
#ifdef PNG_READ_EXPANDED_SUPPORTED
png_free(png_ptr, png_ptr->riffled_palette);
png_ptr->riffled_palette = NULL;
#endif
#ifdef PNG_WRITE_FILTER_SUPPORTED
png_free(png_ptr, png_ptr->prev_row);
png_free(png_ptr, png_ptr->try_row);