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Imported from libpng-1.0.1b.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-05-02 12:52:25 -05:00
parent 896239be20
commit 1d96361273
29 changed files with 837 additions and 710 deletions
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54
pngtrans.c
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@@ -1,12 +1,12 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* libpng 1.0.1a
* libpng 1.0.1b
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* April 21, 1998
* May 2, 1998
*/
#define PNG_INTERNAL
@@ -142,12 +142,13 @@ png_do_invert(png_row_infop row_info, png_bytep row)
#endif
row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp;
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
for (i = 0, rp = row; i < row_info->rowbytes; i++, rp++)
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(~(*rp));
*rp++ = (png_byte)(~(*rp));
}
}
}
@@ -165,12 +166,11 @@ png_do_swap(png_row_infop row_info, png_bytep row)
#endif
row_info->bit_depth == 16)
{
png_bytep rp;
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop= row_info->width * row_info->channels;
for (i = 0, rp = row;
i < row_info->width * row_info->channels;
i++, rp += 2)
for (i = 0; i < istop; i++, rp += 2)
{
png_byte t = *rp;
*rp = *(rp + 1);
@@ -333,7 +333,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
*/
png_bytep sp=row;
png_bytep dp=row;
png_uint_32 width=row_info->width;
png_uint_32 row_width=row_info->width;
png_uint_32 i;
if (row_info->channels == 4)
@@ -344,7 +344,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
if (flags & PNG_FLAG_FILLER_AFTER)
{
dp+=3; sp+=4;
for (i = 1; i < width; i++)
for (i = 1; i < row_width; i++)
{
*dp++ = *sp++;
*dp++ = *sp++;
@@ -355,7 +355,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from XRGB or ARGB to RGB */
else
{
for (i = 0; i < width; i++)
for (i = 0; i < row_width; i++)
{
sp++;
*dp++ = *sp++;
@@ -364,7 +364,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
}
row_info->pixel_depth = 24;
row_info->rowbytes = width * 3;
row_info->rowbytes = row_width * 3;
}
else /* if (row_info->bit_depth == 16) */
{
@@ -372,7 +372,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
{
/* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
sp += 8; dp += 6;
for (i = 1; i < width; i++)
for (i = 1; i < row_width; i++)
{
/* This could be (although memcpy is probably slower):
png_memcpy(dp, sp, 6);
@@ -391,7 +391,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
else
{
/* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
for (i = 0; i < width; i++)
for (i = 0; i < row_width; i++)
{
/* This could be (although memcpy is probably slower):
png_memcpy(dp, sp, 6);
@@ -408,7 +408,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
}
row_info->pixel_depth = 48;
row_info->rowbytes = width * 6;
row_info->rowbytes = row_width * 6;
}
row_info->channels = 3;
row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
@@ -424,7 +424,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from GX or GA to G */
if (flags & PNG_FLAG_FILLER_AFTER)
{
for (i = 0; i < width; i++)
for (i = 0; i < row_width; i++)
{
*dp++ = *sp++;
sp++;
@@ -433,14 +433,14 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from XG or AG to G */
else
{
for (i = 0; i < width; i++)
for (i = 0; i < row_width; i++)
{
sp++;
*dp++ = *sp++;
}
}
row_info->pixel_depth = 8;
row_info->rowbytes = width;
row_info->rowbytes = row_width;
}
else /* if (row_info->bit_depth == 16) */
{
@@ -448,7 +448,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
{
/* This converts from GGXX or GGAA to GG */
sp += 4; dp += 2;
for (i = 1; i < width; i++)
for (i = 1; i < row_width; i++)
{
*dp++ = *sp++;
*dp++ = *sp++;
@@ -458,7 +458,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
else
{
/* This converts from XXGG or AAGG to GG */
for (i = 0; i < width; i++)
for (i = 0; i < row_width; i++)
{
sp += 2;
*dp++ = *sp++;
@@ -466,7 +466,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
}
row_info->pixel_depth = 16;
row_info->rowbytes = width * 2;
row_info->rowbytes = row_width * 2;
}
row_info->channels = 1;
row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
@@ -487,7 +487,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
png_uint_32 width = row_info->width;
png_uint_32 row_width = row_info->width;
if (row_info->bit_depth == 8)
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
@@ -495,7 +495,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < width; i++, rp += 3)
for (i = 0, rp = row; i < row_width; i++, rp += 3)
{
png_byte save = *rp;
*rp = *(rp + 2);
@@ -507,7 +507,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < width; i++, rp += 4)
for (i = 0, rp = row; i < row_width; i++, rp += 4)
{
png_byte save = *rp;
*rp = *(rp + 2);
@@ -522,7 +522,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < width; i++, rp += 6)
for (i = 0, rp = row; i < row_width; i++, rp += 6)
{
png_byte save = *rp;
*rp = *(rp + 4);
@@ -537,7 +537,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
png_bytep rp;
png_uint_32 i;
for (i = 0, rp = row; i < width; i++, rp += 8)
for (i = 0, rp = row; i < row_width; i++, rp += 8)
{
png_byte save = *rp;
*rp = *(rp + 4);