/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
- * libpng 1.0.1
+ * libpng 1.0.3 - January 14, 1999
* 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
- * March 15, 1998
+ * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
#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 avoiding problems with some compilers
- * which don't like bytes as parameters.
+ * for 48-bit input data, as well as to avoid problems with some compilers
+ * that don't like bytes as parameters.
*/
void
png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
else
png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
- /* This should probably go in the "do_filler" routine */
- if (png_ptr->color_type == PNG_COLOR_TYPE_RGB && png_ptr->bit_depth == 8)
+ /* This should probably go in the "do_filler" routine.
+ * I attempted to do that in libpng-1.0.1a but that caused problems
+ * so I restored it in libpng-1.0.2a
+ */
+
+ if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
png_ptr->usr_channels = 4;
}
+
+ /* Also I added this in libpng-1.0.2a (what happens when we expand
+ * a less-than-8-bit grayscale to GA? */
+
+ if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
+ {
+ png_ptr->usr_channels = 2;
+ }
}
#endif
png_ptr->transformations |= PNG_INVERT_MONO;
}
-/* invert monocrome grayscale data */
+/* invert monochrome grayscale data */
void
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++;
}
}
}
#endif
row_info->bit_depth == 16)
{
- png_bytep rp;
- png_byte t;
+ 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)
{
- t = *rp;
+ png_byte t = *rp;
*rp = *(rp + 1);
*(rp + 1) = t;
}
if (row_info->color_type == PNG_COLOR_TYPE_RGB ||
row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
*/
+ png_bytep sp=row;
+ png_bytep dp=row;
+ png_uint_32 row_width=row_info->width;
+ png_uint_32 i;
+
if (row_info->channels == 4)
{
if (row_info->bit_depth == 8)
/* This converts from RGBX or RGBA to RGB */
if (flags & PNG_FLAG_FILLER_AFTER)
{
- png_bytep sp, dp;
- png_uint_32 i;
-
- for (i = 1, sp = row + 4, dp = row + 3; i < row_info->width; i++)
+ dp+=3; sp+=4;
+ for (i = 1; i < row_width; i++)
{
*dp++ = *sp++;
*dp++ = *sp++;
/* This converts from XRGB or ARGB to RGB */
else
{
- png_bytep sp, dp;
- png_uint_32 i;
-
- for (i = 0, sp = row, dp = row; i < row_info->width; i++)
+ for (i = 0; i < row_width; i++)
{
sp++;
*dp++ = *sp++;
}
}
row_info->pixel_depth = 24;
- row_info->rowbytes = row_info->width * 3;
+ row_info->rowbytes = row_width * 3;
}
else /* if (row_info->bit_depth == 16) */
{
if (flags & PNG_FLAG_FILLER_AFTER)
{
- png_bytep sp, dp;
- png_uint_32 i;
-
/* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
- for (i = 1, sp = row + 8, dp = row + 6; i < row_info->width; i++)
+ sp += 8; dp += 6;
+ for (i = 1; i < row_width; i++)
{
/* This could be (although memcpy is probably slower):
png_memcpy(dp, sp, 6);
}
else
{
- png_bytep sp, dp;
- png_uint_32 i;
-
/* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
- for (i = 0, sp = row + 2, dp = row; i < row_info->width; i++)
+ for (i = 0; i < row_width; i++)
{
/* This could be (although memcpy is probably slower):
png_memcpy(dp, sp, 6);
sp += 8;
dp += 6;
*/
+ sp+=2;
*dp++ = *sp++;
*dp++ = *sp++;
*dp++ = *sp++;
}
}
row_info->pixel_depth = 48;
- row_info->rowbytes = row_info->width * 6;
+ row_info->rowbytes = row_width * 6;
}
row_info->channels = 3;
+ row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
}
/*
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY ||
/* This converts from GX or GA to G */
if (flags & PNG_FLAG_FILLER_AFTER)
{
- png_bytep sp, dp;
- png_uint_32 i;
-
- for (i = 1, sp = row + 2, dp = row + 1; i < row_info->width; i++)
+ for (i = 0; i < row_width; i++)
{
*dp++ = *sp++;
sp++;
/* This converts from XG or AG to G */
else
{
- png_bytep sp, dp;
- png_uint_32 i;
-
- for (i = 0, sp = row, dp = row; i < row_info->width; i++)
+ for (i = 0; i < row_width; i++)
{
sp++;
*dp++ = *sp++;
}
}
row_info->pixel_depth = 8;
- row_info->rowbytes = row_info->width;
+ row_info->rowbytes = row_width;
}
else /* if (row_info->bit_depth == 16) */
{
if (flags & PNG_FLAG_FILLER_AFTER)
{
- png_bytep sp, dp;
- png_uint_32 i;
-
/* This converts from GGXX or GGAA to GG */
- for (i = 1, sp = row + 4, dp = row + 2; i < row_info->width; i++)
+ sp += 4; dp += 2;
+ for (i = 1; i < row_width; i++)
{
*dp++ = *sp++;
*dp++ = *sp++;
}
else
{
- png_bytep sp, dp;
- png_uint_32 i;
-
/* This converts from XXGG or AAGG to GG */
- for (i = 0, sp = row, dp = row; i < row_info->width; i++)
+ for (i = 0; i < row_width; i++)
{
sp += 2;
*dp++ = *sp++;
}
}
row_info->pixel_depth = 16;
- row_info->rowbytes = row_info->width * 2;
+ row_info->rowbytes = row_width * 2;
}
row_info->channels = 1;
+ row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
}
}
}
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
+ 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_byte save;
png_uint_32 i;
- for (i = 0, rp = row; i < row_info->width; i++, rp += 3)
+ for (i = 0, rp = row; i < row_width; i++, rp += 3)
{
- save = *rp;
+ 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_byte save;
png_uint_32 i;
- for (i = 0, rp = row; i < row_info->width; i++, rp += 4)
+ for (i = 0, rp = row; i < row_width; i++, rp += 4)
{
- save = *rp;
+ png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
- png_byte save[2];
png_uint_32 i;
- for (i = 0, rp = row; i < row_info->width; i++, rp += 6)
+ for (i = 0, rp = row; i < row_width; i++, rp += 6)
{
- save[0] = *rp;
- save[1] = *(rp + 1);
+ png_byte save = *rp;
*rp = *(rp + 4);
+ *(rp + 4) = save;
+ save = *(rp + 1);
*(rp + 1) = *(rp + 5);
- *(rp + 4) = save[0];
- *(rp + 5) = save[1];
+ *(rp + 5) = save;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
- png_byte save[2];
png_uint_32 i;
- for (i = 0, rp = row; i < row_info->width; i++, rp += 8)
+ for (i = 0, rp = row; i < row_width; i++, rp += 8)
{
- save[0] = *rp;
- save[1] = *(rp + 1);
+ png_byte save = *rp;
*rp = *(rp + 4);
+ *(rp + 4) = save;
+ save = *(rp + 1);
*(rp + 1) = *(rp + 5);
- *(rp + 4) = save[0];
- *(rp + 5) = save[1];
+ *(rp + 5) = save;
}
}
}
projects / wxWidgets.git / blobdiff