X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..f239a20092359e3c914adb79bd39f3f5d2b2e06f:/src/png/pngtrans.c diff --git a/src/png/pngtrans.c b/src/png/pngtrans.c index d38dbd19de..741daf45b7 100644 --- a/src/png/pngtrans.c +++ b/src/png/pngtrans.c @@ -1,44 +1,57 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * libpng 1.0.1 - * 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 + * Last changed in libpng 1.4.2 [April 29, 2010] + * Copyright (c) 1998-2010 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.) + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h */ -#define PNG_INTERNAL +#define PNG_NO_PEDANTIC_WARNINGS #include "png.h" +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +#include "pngpriv.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"); + png_debug(1, "in png_set_bgr"); + + if (png_ptr == NULL) + return; png_ptr->transformations |= PNG_BGR; } #endif #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) -/* turn on 16 bit byte swapping */ -void +/* Turn on 16 bit byte swapping */ +void PNGAPI png_set_swap(png_structp png_ptr) { - png_debug(1, "in png_set_swap\n"); + png_debug(1, "in png_set_swap"); + + if (png_ptr == NULL) + return; 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 +/* Turn on pixel packing */ +void PNGAPI png_set_packing(png_structp png_ptr) { - png_debug(1, "in png_set_packing\n"); + png_debug(1, "in png_set_packing"); + + if (png_ptr == NULL) + return; if (png_ptr->bit_depth < 8) { png_ptr->transformations |= PNG_PACK; @@ -48,21 +61,27 @@ png_set_packing(png_structp png_ptr) #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) -/* turn on packed pixel swapping */ -void +/* Turn on packed pixel swapping */ +void PNGAPI png_set_packswap(png_structp png_ptr) { - png_debug(1, "in png_set_packswap\n"); + png_debug(1, "in png_set_packswap"); + + if (png_ptr == NULL) + return; if (png_ptr->bit_depth < 8) png_ptr->transformations |= PNG_PACKSWAP; } #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"); + png_debug(1, "in png_set_shift"); + + if (png_ptr == NULL) + return; png_ptr->transformations |= PNG_SHIFT; png_ptr->shift = *true_bits; } @@ -70,11 +89,12 @@ png_set_shift(png_structp png_ptr, png_color_8p true_bits) #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 (png_ptr->interlaced) + png_debug(1, "in png_set_interlace handling"); + + if (png_ptr && png_ptr->interlaced) { png_ptr->transformations |= PNG_INTERLACE; return (7); @@ -87,99 +107,161 @@ png_set_interlace_handling(png_structp png_ptr) #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"); + png_debug(1, "in png_set_filler"); + + if (png_ptr == NULL) + return; png_ptr->transformations |= PNG_FILLER; - png_ptr->filler = (png_byte)filler; + png_ptr->filler = (png_uint_16)filler; if (filler_loc == PNG_FILLER_AFTER) png_ptr->flags |= PNG_FLAG_FILLER_AFTER; 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_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 + */ + + 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; + } +} + +/* 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"); + + if (png_ptr == NULL) + return; + png_set_filler(png_ptr, filler, filler_loc); + png_ptr->transformations |= PNG_ADD_ALPHA; } + #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"); + png_debug(1, "in png_set_swap_alpha"); + + if (png_ptr == NULL) + return; png_ptr->transformations |= PNG_SWAP_ALPHA; } #endif #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"); + png_debug(1, "in png_set_invert_alpha"); + + if (png_ptr == NULL) + return; png_ptr->transformations |= PNG_INVERT_ALPHA; } #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_debug(1, "in png_set_invert_mono"); + + if (png_ptr == NULL) + return; 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 && -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif - row_info->color_type == PNG_COLOR_TYPE_GRAY) + png_debug(1, "in png_do_invert"); + + /* This test removed from libpng version 1.0.13 and 1.2.0: + * if (row_info->bit_depth == 1 && + */ + if (row_info->color_type == PNG_COLOR_TYPE_GRAY) + { + png_bytep rp = row; + png_uint_32 i; + png_uint_32 istop = row_info->rowbytes; + + 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; + 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+=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 +/* Swaps byte order on 16 bit depth images */ +void /* PRIVATE */ png_do_swap(png_row_infop row_info, png_bytep row) { - png_debug(1, "in png_do_swap\n"); + png_debug(1, "in png_do_swap"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#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; } @@ -188,7 +270,7 @@ png_do_swap(png_row_infop row_info, png_bytep row) #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) -static png_byte onebppswaptable[256] = { +static PNG_CONST png_byte onebppswaptable[256] = { 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, @@ -223,7 +305,7 @@ static png_byte onebppswaptable[256] = { 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF }; -static png_byte twobppswaptable[256] = { +static PNG_CONST png_byte twobppswaptable[256] = { 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, @@ -258,7 +340,7 @@ static png_byte twobppswaptable[256] = { 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF }; -static png_byte fourbppswaptable[256] = { +static PNG_CONST png_byte fourbppswaptable[256] = { 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, @@ -293,15 +375,13 @@ static png_byte fourbppswaptable[256] = { 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF }; -/* swaps pixel packing order within bytes */ -void +/* Swaps pixel packing order within bytes */ +void /* PRIVATE */ png_do_packswap(png_row_infop row_info, png_bytep row) { - png_debug(1, "in png_do_packswap\n"); + png_debug(1, "in png_do_packswap"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif row_info->bit_depth < 8) { png_bytep rp, end, table; @@ -309,11 +389,11 @@ png_do_packswap(png_row_infop row_info, png_bytep row) end = row + row_info->rowbytes; if (row_info->bit_depth == 1) - table = onebppswaptable; + table = (png_bytep)onebppswaptable; else if (row_info->bit_depth == 2) - table = twobppswaptable; + table = (png_bytep)twobppswaptable; else if (row_info->bit_depth == 4) - table = fourbppswaptable; + table = (png_bytep)fourbppswaptable; else return; @@ -325,30 +405,30 @@ png_do_packswap(png_row_infop row_info, png_bytep row) #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ defined(PNG_READ_STRIP_ALPHA_SUPPORTED) -/* remove filler or alpha byte(s) */ -void +/* Remove filler or alpha byte(s) */ +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 defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL) -#endif + png_debug(1, "in png_do_strip_filler"); + { -/* - if (row_info->color_type == PNG_COLOR_TYPE_RGB || - row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) -*/ - if (row_info->channels == 4) + png_bytep sp=row; + png_bytep dp=row; + png_uint_32 row_width=row_info->width; + png_uint_32 i; + + if ((row_info->color_type == PNG_COLOR_TYPE_RGB || + (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && + (flags & PNG_FLAG_STRIP_ALPHA))) && + 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++; @@ -359,10 +439,7 @@ 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 { - 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++; @@ -371,23 +448,22 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) } } 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++; @@ -399,17 +475,16 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) } 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++; @@ -419,25 +494,21 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) } } row_info->pixel_depth = 48; - row_info->rowbytes = row_info->width * 6; + row_info->rowbytes = row_width * 6; } row_info->channels = 3; } -/* - 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->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && + (flags & PNG_FLAG_STRIP_ALPHA))) && + row_info->channels == 2) { if (row_info->bit_depth == 8) { /* 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++; @@ -446,27 +517,22 @@ 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 { - 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++; @@ -475,11 +541,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) } 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++; @@ -487,37 +550,37 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) } } row_info->pixel_depth = 16; - row_info->rowbytes = row_info->width * 2; + row_info->rowbytes = row_width * 2; } row_info->channels = 1; } + if (flags & PNG_FLAG_STRIP_ALPHA) + row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; } } #endif #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) -/* swaps red and blue bytes within a pixel */ -void +/* Swaps red and blue bytes within a pixel */ +void /* PRIVATE */ png_do_bgr(png_row_infop row_info, png_bytep row) { - png_debug(1, "in png_do_bgr\n"); + png_debug(1, "in png_do_bgr"); + if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#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; } @@ -525,12 +588,11 @@ png_do_bgr(png_row_infop row_info, png_bytep row) 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; } @@ -541,33 +603,31 @@ png_do_bgr(png_row_infop row_info, png_bytep row) 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; } } } @@ -575,3 +635,43 @@ png_do_bgr(png_row_infop row_info, png_bytep row) } #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ + defined(PNG_WRITE_USER_TRANSFORM_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"); + + if (png_ptr == NULL) + return; +#ifdef 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 +} + +/* 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 (png_ptr == NULL) + return (NULL); +#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED + return ((png_voidp)png_ptr->user_transform_ptr); +#else + return (NULL); +#endif +} +#endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || + PNG_WRITE_USER_TRANSFORM_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */