X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/75b6e0a0aba793c6b739689b4414c1a2d8fcb041..64ea838d8f4d1853b7d850db93ee565e901d099a:/src/png/pngtrans.c diff --git a/src/png/pngtrans.c b/src/png/pngtrans.c index 397c988f07..6a6908dcd2 100644 --- a/src/png/pngtrans.c +++ b/src/png/pngtrans.c @@ -1,43 +1,59 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * 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, 1999 Glenn Randers-Pehrson + * Last changed in libpng 1.5.4 [July 7, 2011] + * 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 */ -#define PNG_INTERNAL -#include "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 +/* 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; @@ -47,21 +63,29 @@ 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 -png_set_shift(png_structp png_ptr, png_color_8p true_bits) +void PNGAPI +png_set_shift(png_structp png_ptr, png_const_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; } @@ -69,11 +93,12 @@ 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); @@ -89,18 +114,24 @@ png_set_interlace_handling(png_structp png_ptr) * 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. + /* 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 */ @@ -111,57 +142,83 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) } /* Also I added this in libpng-1.0.2a (what happens when we expand - * a less-than-8-bit grayscale to GA? */ + * 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 monochrome 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; + png_size_t i; + png_size_t istop = row_info->rowbytes; for (i = 0; i < istop; i++) { @@ -169,20 +226,49 @@ png_do_invert(png_row_infop row_info, png_bytep row) 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 +/* 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"); - if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif - row_info->bit_depth == 16) + png_debug(1, "in png_do_swap"); + + if (row_info->bit_depth == 16) { png_bytep rp = row; png_uint_32 i; @@ -197,9 +283,10 @@ png_do_swap(png_row_infop row_info, png_bytep row) } } #endif +#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, @@ -234,7 +321,7 @@ 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, @@ -269,7 +356,7 @@ 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, @@ -304,27 +391,28 @@ 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"); - if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif - row_info->bit_depth < 8) + png_debug(1, "in png_do_packswap"); + + if (row_info->bit_depth < 8) { - png_bytep rp, end, table; + 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; @@ -336,174 +424,130 @@ 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 -png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) +/* 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_debug(1, "in png_do_strip_filler\n"); -#if defined(PNG_USELESS_TESTS_SUPPORTED) - if (row != NULL && row_info != NULL) -#endif + 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->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->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; - if (row_info->channels == 4) + row_info->pixel_depth = 8; + } + + else if (row_info->bit_depth == 16) { - if (row_info->bit_depth == 8) - { - /* This converts from RGBX or RGBA to RGB */ - if (flags & PNG_FLAG_FILLER_AFTER) - { - dp+=3; sp+=4; - for (i = 1; i < row_width; i++) - { - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - sp++; - } - } - /* This converts from XRGB or ARGB to RGB */ - else - { - for (i = 0; i < row_width; i++) - { - sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 24; - row_info->rowbytes = row_width * 3; - } - else /* if (row_info->bit_depth == 16) */ - { - if (flags & PNG_FLAG_FILLER_AFTER) - { - /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ - sp += 8; dp += 6; - for (i = 1; i < row_width; i++) - { - /* This could be (although memcpy is probably slower): - png_memcpy(dp, sp, 6); - sp += 8; - dp += 6; - */ - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - sp += 2; - } - } - else - { - /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ - 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++; - *dp++ = *sp++; - *dp++ = *sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 48; - row_info->rowbytes = row_width * 6; - } - row_info->channels = 3; - row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; + 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 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 + 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 (row_info->bit_depth == 8) + if (at_start) /* Skip initial filler */ + sp += 2; + else /* Skip initial channels and, for sp, the filler */ + sp += 8, dp += 6; + + while (sp < ep) { - /* This converts from GX or GA to G */ - if (flags & PNG_FLAG_FILLER_AFTER) - { - for (i = 0; i < row_width; i++) - { - *dp++ = *sp++; - sp++; - } - } - /* This converts from XG or AG to G */ - else - { - for (i = 0; i < row_width; i++) - { - sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 8; - row_info->rowbytes = row_width; + /* Copy 6 bytes, skip 2 */ + *dp++ = *sp++, *dp++ = *sp++; + *dp++ = *sp++, *dp++ = *sp++; + *dp++ = *sp++, *dp++ = *sp, sp += 3; } - else /* if (row_info->bit_depth == 16) */ - { - if (flags & PNG_FLAG_FILLER_AFTER) - { - /* This converts from GGXX or GGAA to GG */ - sp += 4; dp += 2; - for (i = 1; i < row_width; i++) - { - *dp++ = *sp++; - *dp++ = *sp++; - sp += 2; - } - } - else - { - /* This converts from XXGG or AAGG to GG */ - for (i = 0; i < row_width; i++) - { - sp += 2; - *dp++ = *sp++; - *dp++ = *sp++; - } - } - row_info->pixel_depth = 16; - row_info->rowbytes = row_width * 2; - } - row_info->channels = 1; - row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; + + 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 +/* 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"); - if ( -#if defined(PNG_USELESS_TESTS_SUPPORTED) - row != NULL && row_info != NULL && -#endif - (row_info->color_type & PNG_COLOR_MASK_COLOR)) + 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) @@ -520,6 +564,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row) *(rp + 2) = save; } } + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { png_bytep rp; @@ -533,6 +578,8 @@ png_do_bgr(png_row_infop row_info, png_bytep row) } } } + +#ifdef PNG_16BIT_SUPPORTED else if (row_info->bit_depth == 16) { if (row_info->color_type == PNG_COLOR_TYPE_RGB) @@ -550,6 +597,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row) *(rp + 5) = save; } } + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { png_bytep rp; @@ -566,7 +614,65 @@ png_do_bgr(png_row_infop row_info, png_bytep row) } } } +#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_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; + 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_structp 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_structp 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_structp 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 */