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Imported from libpng-0.81.tar

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This commit is contained in:
Guy Schalnat
1995-09-26 05:22:39 -05:00
committed by Glenn Randers-Pehrson
parent 0d5805822f
commit 51f0eb4584
26 changed files with 2124 additions and 1750 deletions
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63
pngtrans.c
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@@ -2,22 +2,25 @@
/* pngtrans.c - transforms the data in a row
routines used by both readers and writers
libpng 1.0 beta 1 - version 0.71
libpng 1.0 beta 2 - version 0.81
For conditions of distribution and use, see copyright notice in png.h
Copyright (c) 1995 Guy Eric Schalnat, Group 42, Inc.
June 26, 1995
August 24, 1995
*/
#define PNG_INTERNAL
#include "png.h"
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* turn on bgr to rgb mapping */
void
png_set_bgr(png_struct *png_ptr)
{
png_ptr->transformations |= PNG_BGR;
}
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* turn on 16 bit byte swapping */
void
png_set_swap(png_struct *png_ptr)
@@ -25,7 +28,9 @@ png_set_swap(png_struct *png_ptr)
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
png_set_packing(png_struct *png_ptr)
@@ -36,14 +41,18 @@ png_set_packing(png_struct *png_ptr)
png_ptr->usr_bit_depth = 8;
}
}
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
void
png_set_shift(png_struct *png_ptr, png_color_8 *true_bits)
{
png_ptr->transformations |= PNG_SHIFT;
png_ptr->shift = *true_bits;
}
#endif
#if defined(PNG_READ_INTERLACING_SUPPORTED) || defined(PNG_WRITE_INTERLACING_SUPPORTED)
int
png_set_interlace_handling(png_struct *png_ptr)
{
@@ -55,25 +64,35 @@ png_set_interlace_handling(png_struct *png_ptr)
return 1;
}
#endif
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
void
png_set_rgbx(png_struct *png_ptr)
png_set_filler(png_struct *png_ptr, int filler, int filler_loc)
{
png_ptr->transformations |= PNG_RGBA;
png_ptr->transformations |= PNG_FILLER;
png_ptr->filler = (png_byte)filler;
png_ptr->filler_loc = (png_byte)filler_loc;
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB &&
png_ptr->bit_depth == 8)
png_ptr->usr_channels = 4;
}
/* old functions kept around for compatability purposes */
void
png_set_rgbx(png_struct *png_ptr)
{
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
}
void
png_set_xrgb(png_struct *png_ptr)
{
png_ptr->transformations |= PNG_XRGB;
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB &&
png_ptr->bit_depth == 8)
png_ptr->usr_channels = 4;
png_set_filler(png_ptr, 0xff, PNG_FILLER_BEFORE);
}
#endif
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
void
png_set_invert_mono(png_struct *png_ptr)
{
@@ -82,12 +101,12 @@ png_set_invert_mono(png_struct *png_ptr)
/* invert monocrome grayscale data */
void
png_do_invert(png_row_info *row_info, png_byte *row)
png_do_invert(png_row_info *row_info, png_bytef *row)
{
if (row && row_info && row_info->bit_depth == 1 &&
row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_byte *rp;
png_bytef *rp;
png_uint_32 i;
for (i = 0, rp = row;
@@ -98,14 +117,17 @@ png_do_invert(png_row_info *row_info, png_byte *row)
}
}
}
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* swaps byte order on 16 bit depth images */
void
png_do_swap(png_row_info *row_info, png_byte *row)
png_do_swap(png_row_info *row_info, png_bytef *row)
{
if (row && row_info && row_info->bit_depth == 16)
{
png_byte *rp, t;
png_bytef *rp;
png_byte t;
png_uint_32 i;
for (i = 0, rp = row;
@@ -118,16 +140,19 @@ png_do_swap(png_row_info *row_info, png_byte *row)
}
}
}
#endif
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* swaps red and blue */
void
png_do_bgr(png_row_info *row_info, png_byte *row)
png_do_bgr(png_row_info *row_info, png_bytef *row)
{
if (row && row_info && (row_info->color_type & 2))
{
if (row_info->color_type == 2 && row_info->bit_depth == 8)
{
png_byte *rp, t;
png_bytef *rp;
png_byte t;
png_uint_32 i;
for (i = 0, rp = row;
@@ -141,7 +166,8 @@ png_do_bgr(png_row_info *row_info, png_byte *row)
}
else if (row_info->color_type == 6 && row_info->bit_depth == 8)
{
png_byte *rp, t;
png_bytef *rp;
png_byte t;
png_uint_32 i;
for (i = 0, rp = row;
@@ -155,7 +181,8 @@ png_do_bgr(png_row_info *row_info, png_byte *row)
}
else if (row_info->color_type == 2 && row_info->bit_depth == 16)
{
png_byte *rp, t[2];
png_bytef *rp;
png_byte t[2];
png_uint_32 i;
for (i = 0, rp = row;
@@ -172,7 +199,8 @@ png_do_bgr(png_row_info *row_info, png_byte *row)
}
else if (row_info->color_type == 6 && row_info->bit_depth == 16)
{
png_byte *rp, t[2];
png_bytef *rp;
png_byte t[2];
png_uint_32 i;
for (i = 0, rp = row;
@@ -189,4 +217,5 @@ png_do_bgr(png_row_info *row_info, png_byte *row)
}
}
}
#endif