/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.7 - September 12, 2004
* 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, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2004 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");
* 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.
+ /* This should probably go in the "do_read_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
*/
png_ptr->usr_channels = 2;
}
}
+
+#if !defined(PNG_1_0_X)
+/* Added to libpng-1.2.7 */
+void PNGAPI
+png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
+{
+ png_debug(1, "in png_set_add_alpha\n");
+ png_set_filler(png_ptr, filler, filler_loc);
+ png_ptr->transformations |= PNG_ADD_ALPHA;
+}
+#endif
+
#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");
}
/* invert monochrome grayscale data */
-void
+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 = row;
png_uint_32 i;
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;
+ }
+ }
}
#endif
#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");
};
/* 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 != NULL && row_info != NULL)
#endif
{
-/*
- 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->color_type == PNG_COLOR_TYPE_RGB &&
+ row_info->channels == 4)
{
if (row_info->bit_depth == 8)
{
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++;
/* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
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++;
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 ||
- row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
-*/
- else if (row_info->channels == 2)
+ else if (row_info->color_type == PNG_COLOR_TYPE_GRAY &&
+ row_info->channels == 2)
{
if (row_info->bit_depth == 8)
{
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 /* 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
+}
projects / wxWidgets.git / blobdiff