/* pngtrans.c - transforms the data in a row (used by both readers and writers) * * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2011 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 */ #include "pngpriv.h" #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Turn on BGR-to-RGB mapping */ void PNGAPI png_set_bgr(png_structrp png_ptr) { 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 PNGAPI png_set_swap(png_structrp png_ptr) { 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 PNGAPI png_set_packing(png_structrp png_ptr) { png_debug(1, "in png_set_packing"); if (png_ptr == NULL) return; if (png_ptr->bit_depth < 8) { png_ptr->transformations |= PNG_PACK; png_ptr->usr_bit_depth = 8; } } #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) /* Turn on packed pixel swapping */ void PNGAPI png_set_packswap(png_structrp png_ptr) { 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 PNGAPI png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits) { png_debug(1, "in png_set_shift"); if (png_ptr == NULL) return; png_ptr->transformations |= PNG_SHIFT; png_ptr->shift = *true_bits; } #endif #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ defined(PNG_WRITE_INTERLACING_SUPPORTED) int PNGAPI png_set_interlace_handling(png_structrp png_ptr) { png_debug(1, "in png_set_interlace handling"); if (png_ptr && png_ptr->interlaced) { png_ptr->transformations |= PNG_INTERLACE; return (7); } return (1); } #endif #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 to avoid problems with some compilers * that don't like bytes as parameters. */ void PNGAPI png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc) { png_debug(1, "in png_set_filler"); if (png_ptr == NULL) return; png_ptr->transformations |= PNG_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_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_structrp 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 PNGAPI png_set_swap_alpha(png_structrp png_ptr) { 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 PNGAPI png_set_invert_alpha(png_structrp png_ptr) { 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 PNGAPI png_set_invert_mono(png_structrp png_ptr) { png_debug(1, "in png_set_invert_mono"); if (png_ptr == NULL) return; png_ptr->transformations |= PNG_INVERT_MONO; } /* Invert monochrome grayscale data */ void /* PRIVATE */ png_do_invert(png_row_infop row_info, png_bytep row) { 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_size_t i; png_size_t 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 = row; png_size_t i; png_size_t istop = row_info->rowbytes; for (i = 0; i < istop; i += 2) { *rp = (png_byte)(~(*rp)); rp += 2; } } #ifdef PNG_16BIT_SUPPORTED else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && row_info->bit_depth == 16) { png_bytep rp = row; png_size_t i; png_size_t istop = row_info->rowbytes; for (i = 0; i < istop; i += 4) { *rp = (png_byte)(~(*rp)); *(rp + 1) = (png_byte)(~(*(rp + 1))); rp += 4; } } #endif } #endif #ifdef PNG_16BIT_SUPPORTED #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* 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"); if (row_info->bit_depth == 16) { png_bytep rp = row; png_uint_32 i; png_uint_32 istop= row_info->width * row_info->channels; for (i = 0; i < istop; i++, rp += 2) { png_byte t = *rp; *rp = *(rp + 1); *(rp + 1) = t; } } } #endif #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) 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, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF }; 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, 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF }; 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, 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF }; /* 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"); if (row_info->bit_depth < 8) { png_bytep rp; png_const_bytep end, table; end = row + row_info->rowbytes; if (row_info->bit_depth == 1) table = onebppswaptable; else if (row_info->bit_depth == 2) table = twobppswaptable; else if (row_info->bit_depth == 4) table = fourbppswaptable; else return; for (rp = row; rp < end; rp++) *rp = table[*rp]; } } #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ defined(PNG_READ_STRIP_ALPHA_SUPPORTED) /* Remove a channel - this used to be 'png_do_strip_filler' but it used a * somewhat weird combination of flags to determine what to do. All the calls * to png_do_strip_filler are changed in 1.5.2 to call this instead with the * correct arguments. * * The routine isn't general - the channel must be the channel at the start or * end (not in the middle) of each pixel. */ void /* PRIVATE */ png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) { png_bytep sp = row; /* source pointer */ png_bytep dp = row; /* destination pointer */ png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */ /* At the start sp will point to the first byte to copy and dp to where * it is copied to. ep always points just beyond the end of the row, so * the loop simply copies (channels-1) channels until sp reaches ep. * * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc. * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc. */ /* GA, GX, XG cases */ if (row_info->channels == 2) { if (row_info->bit_depth == 8) { if (at_start) /* Skip initial filler */ ++sp; else /* Skip initial channel and, for sp, the filler */ sp += 2, ++dp; /* For a 1 pixel wide image there is nothing to do */ while (sp < ep) *dp++ = *sp, sp += 2; row_info->pixel_depth = 8; } else if (row_info->bit_depth == 16) { if (at_start) /* Skip initial filler */ sp += 2; else /* Skip initial channel and, for sp, the filler */ sp += 4, dp += 2; while (sp < ep) *dp++ = *sp++, *dp++ = *sp, sp += 3; row_info->pixel_depth = 16; } else return; /* bad bit depth */ row_info->channels = 1; /* Finally fix the color type if it records an alpha channel */ if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) row_info->color_type = PNG_COLOR_TYPE_GRAY; } /* RGBA, RGBX, XRGB cases */ else if (row_info->channels == 4) { if (row_info->bit_depth == 8) { if (at_start) /* Skip initial filler */ ++sp; else /* Skip initial channels and, for sp, the filler */ sp += 4, dp += 3; /* Note that the loop adds 3 to dp and 4 to sp each time. */ while (sp < ep) *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2; row_info->pixel_depth = 24; } else if (row_info->bit_depth == 16) { if (at_start) /* Skip initial filler */ sp += 2; else /* Skip initial channels and, for sp, the filler */ sp += 8, dp += 6; while (sp < ep) { /* Copy 6 bytes, skip 2 */ *dp++ = *sp++, *dp++ = *sp++; *dp++ = *sp++, *dp++ = *sp++; *dp++ = *sp++, *dp++ = *sp, sp += 3; } row_info->pixel_depth = 48; } else return; /* bad bit depth */ row_info->channels = 3; /* Finally fix the color type if it records an alpha channel */ if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) row_info->color_type = PNG_COLOR_TYPE_RGB; } else return; /* The filler channel has gone already */ /* Fix the rowbytes value. */ row_info->rowbytes = dp-row; } #endif #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* 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"); if ((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_uint_32 i; for (i = 0, rp = row; i < row_width; i++, rp += 3) { 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_uint_32 i; for (i = 0, rp = row; i < row_width; i++, rp += 4) { png_byte save = *rp; *rp = *(rp + 2); *(rp + 2) = save; } } } #ifdef PNG_16BIT_SUPPORTED else if (row_info->bit_depth == 16) { if (row_info->color_type == PNG_COLOR_TYPE_RGB) { png_bytep rp; png_uint_32 i; for (i = 0, rp = row; i < row_width; i++, rp += 6) { png_byte save = *rp; *rp = *(rp + 4); *(rp + 4) = save; save = *(rp + 1); *(rp + 1) = *(rp + 5); *(rp + 5) = save; } } else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { png_bytep rp; png_uint_32 i; for (i = 0, rp = row; i < row_width; i++, rp += 8) { png_byte save = *rp; *rp = *(rp + 4); *(rp + 4) = save; save = *(rp + 1); *(rp + 1) = *(rp + 5); *(rp + 5) = save; } } } #endif } } #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED void PNGAPI png_set_user_transform_info(png_structrp 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; 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; } #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. */ #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED png_voidp PNGAPI png_get_user_transform_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); return ((png_voidp)png_ptr->user_transform_ptr); } #endif #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED png_uint_32 PNGAPI png_get_current_row_number(png_const_structrp png_ptr) { /* See the comments in png.h - this is the sub-image row when reading and * interlaced image. */ if (png_ptr != NULL) return png_ptr->row_number; return PNG_UINT_32_MAX; /* help the app not to fail silently */ } png_byte PNGAPI png_get_current_pass_number(png_const_structrp png_ptr) { if (png_ptr != NULL) return png_ptr->pass; return 8; /* invalid */ } #endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */ #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || PNG_WRITE_USER_TRANSFORM_SUPPORTED */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */