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libpng/pngtrans.c

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/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* Copyright (c) 2018-2024 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.
*
* 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 defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* Turn on BGR-to-RGB mapping */
void PNGAPI
png_set_bgr(png_structrp png_ptr)
{
png_debug(1, "in png_set_bgr");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_BGR;
}
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* Turn on 16-bit byte swapping */
void PNGAPI
png_set_swap(png_structrp png_ptr)
{
png_debug(1, "in png_set_swap");
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth == 16)
png_ptr->transformations |= PNG_SWAP_BYTES;
}
#endif
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
/* Turn on pixel packing */
void PNGAPI
png_set_packing(png_structrp png_ptr)
{
png_debug(1, "in png_set_packing");
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth < 8)
{
png_ptr->transformations |= PNG_PACK;
# ifdef PNG_WRITE_SUPPORTED
png_ptr->usr_bit_depth = 8;
# endif
}
}
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* Turn on packed pixel swapping */
void PNGAPI
png_set_packswap(png_structrp png_ptr)
{
png_debug(1, "in png_set_packswap");
if (png_ptr == NULL)
return;
if (png_ptr->bit_depth < 8)
png_ptr->transformations |= PNG_PACKSWAP;
}
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
void PNGAPI
png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits)
{
png_debug(1, "in png_set_shift");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_SHIFT;
png_ptr->shift = *true_bits;
}
#endif
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
defined(PNG_WRITE_INTERLACING_SUPPORTED)
int PNGAPI
png_set_interlace_handling(png_structrp png_ptr)
{
png_debug(1, "in png_set_interlace handling");
if (png_ptr != 0 && png_ptr->interlaced != 0)
{
png_ptr->transformations |= PNG_INTERLACE;
return 7;
}
return 1;
}
#endif
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
/* Add a filler byte on read, or remove a filler or alpha byte on write.
* The filler type has changed in v0.95 to allow future 2-byte fillers
* for 48-bit input data, as well as to avoid problems with some compilers
* that don't like bytes as parameters.
*/
void PNGAPI
png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_filler");
if (png_ptr == NULL)
return;
/* In libpng 1.6 it is possible to determine whether this is a read or write
* operation and therefore to do more checking here for a valid call.
*/
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
{
# ifdef PNG_READ_FILLER_SUPPORTED
/* On read png_set_filler is always valid, regardless of the base PNG
* format, because other transformations can give a format where the
* filler code can execute (basically an 8 or 16-bit component RGB or G
* format.)
*
* NOTE: usr_channels is not used by the read code! (This has led to
* confusion in the past.) The filler is only used in the read code.
*/
png_ptr->filler = (png_uint_16)filler;
# else
png_app_error(png_ptr, "png_set_filler not supported on read");
PNG_UNUSED(filler) /* not used in the write case */
return;
# endif
}
else /* write */
{
# ifdef PNG_WRITE_FILLER_SUPPORTED
/* On write the usr_channels parameter must be set correctly at the
* start to record the number of channels in the app-supplied data.
*/
switch (png_ptr->color_type)
{
case PNG_COLOR_TYPE_RGB:
png_ptr->usr_channels = 4;
break;
case PNG_COLOR_TYPE_GRAY:
if (png_ptr->bit_depth >= 8)
{
png_ptr->usr_channels = 2;
break;
}
else
{
/* There simply isn't any code in libpng to strip out bits
* from bytes when the components are less than a byte in
* size!
*/
png_app_error(png_ptr,
"png_set_filler is invalid for"
" low bit depth gray output");
return;
}
default:
png_app_error(png_ptr,
"png_set_filler: inappropriate color type");
return;
}
# else
png_app_error(png_ptr, "png_set_filler not supported on write");
return;
# endif
}
/* Here on success - libpng supports the operation, set the transformation
* and the flag to say where the filler channel is.
*/
png_ptr->transformations |= PNG_FILLER;
if (filler_loc == PNG_FILLER_AFTER)
png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
else
png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
}
/* Added to libpng-1.2.7 */
void PNGAPI
png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_add_alpha");
if (png_ptr == NULL)
return;
png_set_filler(png_ptr, filler, filler_loc);
/* The above may fail to do anything. */
if ((png_ptr->transformations & PNG_FILLER) != 0)
png_ptr->transformations |= PNG_ADD_ALPHA;
}
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
void PNGAPI
png_set_swap_alpha(png_structrp png_ptr)
{
png_debug(1, "in png_set_swap_alpha");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_SWAP_ALPHA;
}
#endif
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
void PNGAPI
png_set_invert_alpha(png_structrp png_ptr)
{
png_debug(1, "in png_set_invert_alpha");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_INVERT_ALPHA;
}
#endif
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
void PNGAPI
png_set_invert_mono(png_structrp png_ptr)
{
png_debug(1, "in png_set_invert_mono");
if (png_ptr == NULL)
return;
png_ptr->transformations |= PNG_INVERT_MONO;
}
/* Invert monochrome grayscale data */
void /* PRIVATE */
png_do_invert(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_invert");
/* This test removed from libpng version 1.0.13 and 1.2.0:
* if (row_info->bit_depth == 1 &&
*/
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp = row;
size_t i;
size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(~(*rp));
rp++;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
row_info->bit_depth == 8)
{
png_bytep rp = row;
size_t i;
size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 2)
{
*rp = (png_byte)(~(*rp));
rp += 2;
}
}
#ifdef PNG_16BIT_SUPPORTED
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
row_info->bit_depth == 16)
{
png_bytep rp = row;
size_t i;
size_t istop = row_info->rowbytes;
for (i = 0; i < istop; i += 4)
{
*rp = (png_byte)(~(*rp));
*(rp + 1) = (png_byte)(~(*(rp + 1)));
rp += 4;
}
}
#endif
}
#endif
#ifdef PNG_16BIT_SUPPORTED
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* Swaps byte order on 16-bit depth images */
void /* PRIVATE */
png_do_swap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_swap");
if (row_info->bit_depth == 16)
{
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop= row_info->width * row_info->channels;
for (i = 0; i < istop; i++, rp += 2)
{
#ifdef PNG_BUILTIN_BSWAP16_SUPPORTED
/* Feature added to libpng-1.6.11 for testing purposes, not
* enabled by default.
*/
*(png_uint_16*)rp = __builtin_bswap16(*(png_uint_16*)rp);
#else
png_byte t = *rp;
*rp = *(rp + 1);
*(rp + 1) = t;
#endif
}
}
}
#endif
#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
static const png_byte onebppswaptable[256] = {
0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
};
static const png_byte twobppswaptable[256] = {
0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,
0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,
0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,
0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,
0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,
0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,
0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,
0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,
0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,
0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,
0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,
0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,
0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,
0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,
0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,
0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,
0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,
0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,
0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,
0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,
0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,
0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,
0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,
0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,
0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,
0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,
0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,
0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,
0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
};
static const png_byte fourbppswaptable[256] = {
0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,
0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,
0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,
0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,
0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,
0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,
0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,
0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,
0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,
0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,
0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,
0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,
0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,
0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,
0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,
0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,
0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,
0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,
0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,
0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,
0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,
0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,
0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,
0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,
0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,
0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,
0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,
0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,
0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
};
/* Swaps pixel packing order within bytes */
void /* PRIVATE */
png_do_packswap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_packswap");
if (row_info->bit_depth < 8)
{
png_bytep rp;
png_const_bytep end, table;
end = row + row_info->rowbytes;
if (row_info->bit_depth == 1)
table = onebppswaptable;
else if (row_info->bit_depth == 2)
table = twobppswaptable;
else if (row_info->bit_depth == 4)
table = fourbppswaptable;
else
return;
for (rp = row; rp < end; rp++)
*rp = table[*rp];
}
}
#endif /* PACKSWAP || WRITE_PACKSWAP */
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* Remove a channel - this used to be 'png_do_strip_filler' but it used a
* somewhat weird combination of flags to determine what to do. All the calls
* to png_do_strip_filler are changed in 1.5.2 to call this instead with the
* correct arguments.
*
* The routine isn't general - the channel must be the channel at the start or
* end (not in the middle) of each pixel.
*/
void /* PRIVATE */
png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)
{
png_bytep sp = row; /* source pointer */
png_bytep dp = row; /* destination pointer */
png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */
png_debug(1, "in png_do_strip_channel");
/* At the start sp will point to the first byte to copy and dp to where
* it is copied to. ep always points just beyond the end of the row, so
* the loop simply copies (channels-1) channels until sp reaches ep.
*
* at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.
* nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.
*/
/* GA, GX, XG cases */
if (row_info->channels == 2)
{
if (row_info->bit_depth == 8)
{
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channel and, for sp, the filler */
{
sp += 2; ++dp;
}
/* For a 1 pixel wide image there is nothing to do */
while (sp < ep)
{
*dp++ = *sp; sp += 2;
}
row_info->pixel_depth = 8;
}
else if (row_info->bit_depth == 16)
{
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channel and, for sp, the filler */
{
sp += 4; dp += 2;
}
while (sp < ep)
{
*dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 16;
}
else
return; /* bad bit depth */
row_info->channels = 1;
/* Finally fix the color type if it records an alpha channel */
if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
row_info->color_type = PNG_COLOR_TYPE_GRAY;
}
/* RGBA, RGBX, XRGB cases */
else if (row_info->channels == 4)
{
if (row_info->bit_depth == 8)
{
if (at_start != 0) /* Skip initial filler */
++sp;
else /* Skip initial channels and, for sp, the filler */
{
sp += 4; dp += 3;
}
/* Note that the loop adds 3 to dp and 4 to sp each time. */
while (sp < ep)
{
*dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp; sp += 2;
}
row_info->pixel_depth = 24;
}
else if (row_info->bit_depth == 16)
{
if (at_start != 0) /* Skip initial filler */
sp += 2;
else /* Skip initial channels and, for sp, the filler */
{
sp += 8; dp += 6;
}
while (sp < ep)
{
/* Copy 6 bytes, skip 2 */
*dp++ = *sp++; *dp++ = *sp++;
*dp++ = *sp++; *dp++ = *sp++;
*dp++ = *sp++; *dp++ = *sp; sp += 3;
}
row_info->pixel_depth = 48;
}
else
return; /* bad bit depth */
row_info->channels = 3;
/* Finally fix the color type if it records an alpha channel */
if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
row_info->color_type = PNG_COLOR_TYPE_RGB;
}
else
return; /* The filler channel has gone already */
/* Fix the rowbytes value. */
row_info->rowbytes = (size_t)(dp-row);
}
#endif
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* Swaps red and blue bytes within a pixel */
void /* PRIVATE */
png_do_bgr(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_bgr");
if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0)
{
png_uint_32 row_width = row_info->width;
if (row_info->bit_depth == 8)
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 3)
{
png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 4)
{
png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
}
}
#ifdef PNG_16BIT_SUPPORTED
else if (row_info->bit_depth == 16)
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 6)
{
png_byte save = *rp;
*rp = *(rp + 4);
*(rp + 4) = save;
save = *(rp + 1);
*(rp + 1) = *(rp + 5);
*(rp + 5) = save;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < row_width; i++, rp += 8)
{
png_byte save = *rp;
*rp = *(rp + 4);
*(rp + 4) = save;
save = *(rp + 1);
*(rp + 1) = *(rp + 5);
*(rp + 5) = save;
}
}
}
#endif
}
}
#endif /* READ_BGR || WRITE_BGR */
#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
/* Added at libpng-1.5.10 */
void /* PRIVATE */
png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info)
{
png_debug(1, "in png_do_check_palette_indexes");
if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
{
/* Calculations moved outside switch in an attempt to stop different
* compiler warnings. 'padding' is in *bits* within the last byte, it is
* an 'int' because pixel_depth becomes an 'int' in the expression below,
* and this calculation is used because it avoids warnings that other
* forms produced on either GCC or MSVC.
*/
int padding = PNG_PADBITS(row_info->pixel_depth, row_info->width);
png_bytep rp = png_ptr->row_buf + row_info->rowbytes;
switch (row_info->bit_depth)
{
case 1:
{
/* in this case, all bytes must be 0 so we don't need
* to unpack the pixels except for the rightmost one.
*/
for (; rp > png_ptr->row_buf; rp--)
{
if ((*rp >> padding) != 0)
png_ptr->num_palette_max = 1;
padding = 0;
}
break;
}
case 2:
{
for (; rp > png_ptr->row_buf; rp--)
{
int i = ((*rp >> padding) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 2) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 4) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 6) & 0x03);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
padding = 0;
}
break;
}
case 4:
{
for (; rp > png_ptr->row_buf; rp--)
{
int i = ((*rp >> padding) & 0x0f);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
i = (((*rp >> padding) >> 4) & 0x0f);
if (i > png_ptr->num_palette_max)
png_ptr->num_palette_max = i;
padding = 0;
}
break;
}
case 8:
{
for (; rp > png_ptr->row_buf; rp--)
{
if (*rp > png_ptr->num_palette_max)
png_ptr->num_palette_max = (int) *rp;
}
break;
}
default:
break;
}
}
}
#endif /* CHECK_FOR_INVALID_INDEX */
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
void PNGAPI
png_set_user_transform_info(png_structrp png_ptr, png_voidp
user_transform_ptr, int user_transform_depth, int user_transform_channels)
{
png_debug(1, "in png_set_user_transform_info");
if (png_ptr == NULL)
return;
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
(png_ptr->flags & PNG_FLAG_ROW_INIT) != 0)
{
png_app_error(png_ptr,
"info change after png_start_read_image or png_read_update_info");
return;
}
#endif
png_ptr->user_transform_ptr = user_transform_ptr;
png_ptr->user_transform_depth = (png_byte)user_transform_depth;
png_ptr->user_transform_channels = (png_byte)user_transform_channels;
}
#endif
/* This function returns a pointer to the user_transform_ptr associated with
* the user transform functions. The application should free any memory
* associated with this pointer before png_write_destroy and png_read_destroy
* are called.
*/
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
png_voidp PNGAPI
png_get_user_transform_ptr(png_const_structrp png_ptr)
{
if (png_ptr == NULL)
return NULL;
return png_ptr->user_transform_ptr;
}
#endif
#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
png_uint_32 PNGAPI
png_get_current_row_number(png_const_structrp png_ptr)
{
/* See the comments in png.h - this is the sub-image row when reading an
* interlaced image.
*/
if (png_ptr != NULL)
return png_ptr->row_number;
return PNG_UINT_32_MAX; /* help the app not to fail silently */
}
png_byte PNGAPI
png_get_current_pass_number(png_const_structrp png_ptr)
{
if (png_ptr != NULL)
return png_ptr->pass;
return 8; /* invalid */
}
#endif /* USER_TRANSFORM_INFO */
#endif /* READ_USER_TRANSFORM || WRITE_USER_TRANSFORM */
#endif /* READ || WRITE */
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