/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
- * libpng 1.0.1
+ * libpng 1.2.4 - July 8, 2002
* 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) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#include "png.h"
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* turn on bgr to rgb mapping */
-void
+/* turn on BGR-to-RGB mapping */
+void PNGAPI
png_set_bgr(png_structp png_ptr)
{
png_debug(1, "in png_set_bgr\n");
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* turn on 16 bit byte swapping */
-void
+void PNGAPI
png_set_swap(png_structp png_ptr)
{
png_debug(1, "in png_set_swap\n");
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
/* turn on pixel packing */
-void
+void PNGAPI
png_set_packing(png_structp png_ptr)
{
png_debug(1, "in png_set_packing\n");
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* turn on packed pixel swapping */
-void
+void PNGAPI
png_set_packswap(png_structp png_ptr)
{
png_debug(1, "in png_set_packswap\n");
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-void
+void PNGAPI
png_set_shift(png_structp png_ptr, png_color_8p true_bits)
{
png_debug(1, "in png_set_shift\n");
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
defined(PNG_WRITE_INTERLACING_SUPPORTED)
-int
+int PNGAPI
png_set_interlace_handling(png_structp png_ptr)
{
png_debug(1, "in png_set_interlace handling\n");
#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
+void PNGAPI
png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_filler\n");
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
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+void PNGAPI
png_set_swap_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_swap_alpha\n");
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+void PNGAPI
png_set_invert_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_invert_alpha\n");
#endif
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-void
+void PNGAPI
png_set_invert_mono(png_structp png_ptr)
{
png_debug(1, "in png_set_invert_mono\n");
png_ptr->transformations |= PNG_INVERT_MONO;
}
-/* invert monocrome grayscale data */
-void
+/* invert monochrome grayscale data */
+void /* PRIVATE */
png_do_invert(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_invert\n");
- if (row_info->bit_depth == 1 &&
+ /* This test removed from libpng version 1.0.13 and 1.2.0:
+ * if (row_info->bit_depth == 1 &&
+ */
#if defined(PNG_USELESS_TESTS_SUPPORTED)
- row != NULL && row_info != NULL &&
+ if (row == NULL || row_info == NULL)
+ return;
#endif
- row_info->color_type == PNG_COLOR_TYPE_GRAY)
+ if (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++;
+ }
+ }
+ else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+ row_info->bit_depth == 8)
+ {
+ png_bytep rp = row;
+ png_uint_32 i;
+ png_uint_32 istop = row_info->rowbytes;
+
+ for (i = 0; i < istop; i+=2)
+ {
+ *rp = (png_byte)(~(*rp));
+ rp+=2;
+ }
+ }
+ else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+ row_info->bit_depth == 16)
+ {
+ png_bytep rp = row;
+ png_uint_32 i;
+ png_uint_32 istop = row_info->rowbytes;
+
+ for (i = 0; i < istop; i+=4)
+ {
+ *rp = (png_byte)(~(*rp));
+ *(rp+1) = (png_byte)(~(*(rp+1)));
+ rp+=4;
}
}
}
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* swaps byte order on 16 bit depth images */
-void
+void /* PRIVATE */
png_do_swap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_swap\n");
#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;
}
};
/* swaps pixel packing order within bytes */
-void
+void /* PRIVATE */
png_do_packswap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_packswap\n");
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* remove filler or alpha byte(s) */
-void
+void /* PRIVATE */
png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
{
png_debug(1, "in png_do_strip_filler\n");
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):
+ /* This could be (although png_memcpy is probably slower):
png_memcpy(dp, sp, 6);
sp += 8;
dp += 6;
*/
+
*dp++ = *sp++;
*dp++ = *sp++;
*dp++ = *sp++;
}
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):
+ /* This could be (although png_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;
}
}
}
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* swaps red and blue bytes within a pixel */
-void
+void /* PRIVATE */
png_do_bgr(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_bgr\n");
#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;
}
}
}
}
#endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
+void PNGAPI
+png_set_user_transform_info(png_structp png_ptr, png_voidp
+ user_transform_ptr, int user_transform_depth, int user_transform_channels)
+{
+ png_debug(1, "in png_set_user_transform_info\n");
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ 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;
+#else
+ if(user_transform_ptr || user_transform_depth || user_transform_channels)
+ png_warning(png_ptr,
+ "This version of libpng does not support user transform info");
+#endif
+}
+#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.
+ */
+png_voidp PNGAPI
+png_get_user_transform_ptr(png_structp png_ptr)
+{
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ return ((png_voidp)png_ptr->user_transform_ptr);
+#else
+ if(png_ptr)
+ return (NULL);
+ return (NULL);
+#endif
+}
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