diff options
Diffstat (limited to 'src/3rdparty/libpng/pngwtran.c')
| -rw-r--r-- | src/3rdparty/libpng/pngwtran.c | 255 |
1 files changed, 98 insertions, 157 deletions
diff --git a/src/3rdparty/libpng/pngwtran.c b/src/3rdparty/libpng/pngwtran.c index 96608efcb4..db82e27bce 100644 --- a/src/3rdparty/libpng/pngwtran.c +++ b/src/3rdparty/libpng/pngwtran.c @@ -1,8 +1,8 @@ /* pngwtran.c - transforms the data in a row for PNG writers * - * Last changed in libpng 1.5.6 [November 3, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.17 [March 26, 2015] + * Copyright (c) 1998-2015 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.) * @@ -14,90 +14,14 @@ #include "pngpriv.h" #ifdef PNG_WRITE_SUPPORTED - #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED -/* Transform the data according to the user's wishes. The order of - * transformations is significant. - */ -void /* PRIVATE */ -png_do_write_transformations(png_structp png_ptr, png_row_infop row_info) -{ - png_debug(1, "in png_do_write_transformations"); - - if (png_ptr == NULL) - return; - -#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED - if (png_ptr->transformations & PNG_USER_TRANSFORM) - if (png_ptr->write_user_transform_fn != NULL) - (*(png_ptr->write_user_transform_fn)) /* User write transform - function */ - (png_ptr, /* png_ptr */ - row_info, /* row_info: */ - /* png_uint_32 width; width of row */ - /* png_size_t rowbytes; number of bytes in row */ - /* png_byte color_type; color type of pixels */ - /* png_byte bit_depth; bit depth of samples */ - /* png_byte channels; number of channels (1-4) */ - /* png_byte pixel_depth; bits per pixel (depth*channels) */ - png_ptr->row_buf + 1); /* start of pixel data for row */ -#endif - -#ifdef PNG_WRITE_FILLER_SUPPORTED - if (png_ptr->transformations & PNG_FILLER) - png_do_strip_channel(row_info, png_ptr->row_buf + 1, - !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); -#endif - -#ifdef PNG_WRITE_PACKSWAP_SUPPORTED - if (png_ptr->transformations & PNG_PACKSWAP) - png_do_packswap(row_info, png_ptr->row_buf + 1); -#endif - -#ifdef PNG_WRITE_PACK_SUPPORTED - if (png_ptr->transformations & PNG_PACK) - png_do_pack(row_info, png_ptr->row_buf + 1, - (png_uint_32)png_ptr->bit_depth); -#endif - -#ifdef PNG_WRITE_SWAP_SUPPORTED - if (png_ptr->transformations & PNG_SWAP_BYTES) - png_do_swap(row_info, png_ptr->row_buf + 1); -#endif - -#ifdef PNG_WRITE_SHIFT_SUPPORTED - if (png_ptr->transformations & PNG_SHIFT) - png_do_shift(row_info, png_ptr->row_buf + 1, - &(png_ptr->shift)); -#endif - -#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED - if (png_ptr->transformations & PNG_SWAP_ALPHA) - png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1); -#endif - -#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED - if (png_ptr->transformations & PNG_INVERT_ALPHA) - png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1); -#endif - -#ifdef PNG_WRITE_BGR_SUPPORTED - if (png_ptr->transformations & PNG_BGR) - png_do_bgr(row_info, png_ptr->row_buf + 1); -#endif - -#ifdef PNG_WRITE_INVERT_SUPPORTED - if (png_ptr->transformations & PNG_INVERT_MONO) - png_do_invert(row_info, png_ptr->row_buf + 1); -#endif -} #ifdef PNG_WRITE_PACK_SUPPORTED /* Pack pixels into bytes. Pass the true bit depth in bit_depth. The * row_info bit depth should be 8 (one pixel per byte). The channels * should be 1 (this only happens on grayscale and paletted images). */ -void /* PRIVATE */ +static void png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) { png_debug(1, "in png_do_pack"); @@ -242,7 +166,7 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) * would pass 3 as bit_depth, and this routine would translate the * data to 0 to 15. */ -void /* PRIVATE */ +static void png_do_shift(png_row_infop row_info, png_bytep row, png_const_color_8p bit_depth) { @@ -253,7 +177,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, int shift_start[4], shift_dec[4]; int channels = 0; - if (row_info->color_type & PNG_COLOR_MASK_COLOR) + if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0) { shift_start[channels] = row_info->bit_depth - bit_depth->red; shift_dec[channels] = bit_depth->red; @@ -275,7 +199,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, channels++; } - if (row_info->color_type & PNG_COLOR_MASK_ALPHA) + if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0) { shift_start[channels] = row_info->bit_depth - bit_depth->alpha; shift_dec[channels] = bit_depth->alpha; @@ -287,7 +211,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, { png_bytep bp = row; png_size_t i; - png_byte mask; + unsigned int mask; png_size_t row_bytes = row_info->rowbytes; if (bit_depth->gray == 1 && row_info->bit_depth == 2) @@ -301,20 +225,22 @@ png_do_shift(png_row_infop row_info, png_bytep row, for (i = 0; i < row_bytes; i++, bp++) { - png_uint_16 v; int j; + unsigned int v, out; v = *bp; - *bp = 0; + out = 0; for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) { if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); + out |= v << j; else - *bp |= (png_byte)((v >> (-j)) & mask); + out |= (v >> (-j)) & mask; } + + *bp = (png_byte)(out & 0xff); } } @@ -327,21 +253,23 @@ png_do_shift(png_row_infop row_info, png_bytep row, for (i = 0; i < istop; i++, bp++) { - png_uint_16 v; + const unsigned int c = i%channels; int j; - int c = (int)(i%channels); + unsigned int v, out; v = *bp; - *bp = 0; + out = 0; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); + out |= v << j; else - *bp |= (png_byte)((v >> (-j)) & 0xff); + out |= v >> (-j); } + + *bp = (png_byte)(out & 0xff); } } @@ -353,22 +281,22 @@ png_do_shift(png_row_infop row_info, png_bytep row, for (bp = row, i = 0; i < istop; i++) { - int c = (int)(i%channels); - png_uint_16 value, v; + const unsigned int c = i%channels; int j; + unsigned int value, v; - v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); + v = png_get_uint_16(bp); value = 0; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); + value |= v << j; else - value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); + value |= v >> (-j); } - *bp++ = (png_byte)(value >> 8); + *bp++ = (png_byte)((value >> 8) & 0xff); *bp++ = (png_byte)(value & 0xff); } } @@ -377,7 +305,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, #endif #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED -void /* PRIVATE */ +static void png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_write_swap_alpha"); @@ -425,7 +353,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) *(dp++) = save[1]; } } -#endif /* PNG_WRITE_16BIT_SUPPORTED */ +#endif /* WRITE_16BIT */ } else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) @@ -464,14 +392,14 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) *(dp++) = save[1]; } } -#endif /* PNG_WRITE_16BIT_SUPPORTED */ +#endif /* WRITE_16BIT */ } } } #endif #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED -void /* PRIVATE */ +static void png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_write_invert_alpha"); @@ -521,7 +449,7 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) *(dp++) = (png_byte)(255 - *(sp++)); } } -#endif /* PNG_WRITE_16BIT_SUPPORTED */ +#endif /* WRITE_16BIT */ } else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) @@ -559,75 +487,88 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) *(dp++) = (png_byte)(255 - *(sp++)); } } -#endif /* PNG_WRITE_16BIT_SUPPORTED */ +#endif /* WRITE_16BIT */ } } } #endif -#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ -#ifdef PNG_MNG_FEATURES_SUPPORTED -/* Undoes intrapixel differencing */ +/* Transform the data according to the user's wishes. The order of + * transformations is significant. + */ void /* PRIVATE */ -png_do_write_intrapixel(png_row_infop row_info, png_bytep row) +png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info) { - png_debug(1, "in png_do_write_intrapixel"); + png_debug(1, "in png_do_write_transformations"); - if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) - { - int bytes_per_pixel; - png_uint_32 row_width = row_info->width; - if (row_info->bit_depth == 8) - { - png_bytep rp; - png_uint_32 i; + if (png_ptr == NULL) + return; - if (row_info->color_type == PNG_COLOR_TYPE_RGB) - bytes_per_pixel = 3; +#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED + if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0) + if (png_ptr->write_user_transform_fn != NULL) + (*(png_ptr->write_user_transform_fn)) /* User write transform + function */ + (png_ptr, /* png_ptr */ + row_info, /* row_info: */ + /* png_uint_32 width; width of row */ + /* png_size_t rowbytes; number of bytes in row */ + /* png_byte color_type; color type of pixels */ + /* png_byte bit_depth; bit depth of samples */ + /* png_byte channels; number of channels (1-4) */ + /* png_byte pixel_depth; bits per pixel (depth*channels) */ + png_ptr->row_buf + 1); /* start of pixel data for row */ +#endif - else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) - bytes_per_pixel = 4; +#ifdef PNG_WRITE_FILLER_SUPPORTED + if ((png_ptr->transformations & PNG_FILLER) != 0) + png_do_strip_channel(row_info, png_ptr->row_buf + 1, + !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); +#endif - else - return; +#ifdef PNG_WRITE_PACKSWAP_SUPPORTED + if ((png_ptr->transformations & PNG_PACKSWAP) != 0) + png_do_packswap(row_info, png_ptr->row_buf + 1); +#endif - for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) - { - *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff); - *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff); - } - } +#ifdef PNG_WRITE_PACK_SUPPORTED + if ((png_ptr->transformations & PNG_PACK) != 0) + png_do_pack(row_info, png_ptr->row_buf + 1, + (png_uint_32)png_ptr->bit_depth); +#endif -#ifdef PNG_WRITE_16BIT_SUPPORTED - else if (row_info->bit_depth == 16) - { - png_bytep rp; - png_uint_32 i; +#ifdef PNG_WRITE_SWAP_SUPPORTED +# ifdef PNG_16BIT_SUPPORTED + if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0) + png_do_swap(row_info, png_ptr->row_buf + 1); +# endif +#endif + +#ifdef PNG_WRITE_SHIFT_SUPPORTED + if ((png_ptr->transformations & PNG_SHIFT) != 0) + png_do_shift(row_info, png_ptr->row_buf + 1, + &(png_ptr->shift)); +#endif - if (row_info->color_type == PNG_COLOR_TYPE_RGB) - bytes_per_pixel = 6; +#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED + if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0) + png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1); +#endif - else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) - bytes_per_pixel = 8; +#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED + if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0) + png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1); +#endif - else - return; +#ifdef PNG_WRITE_BGR_SUPPORTED + if ((png_ptr->transformations & PNG_BGR) != 0) + png_do_bgr(row_info, png_ptr->row_buf + 1); +#endif - for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) - { - png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); - png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); - png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); - png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); - png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); - *(rp ) = (png_byte)((red >> 8) & 0xff); - *(rp + 1) = (png_byte)(red & 0xff); - *(rp + 4) = (png_byte)((blue >> 8) & 0xff); - *(rp + 5) = (png_byte)(blue & 0xff); - } - } -#endif /* PNG_WRITE_16BIT_SUPPORTED */ - } +#ifdef PNG_WRITE_INVERT_SUPPORTED + if ((png_ptr->transformations & PNG_INVERT_MONO) != 0) + png_do_invert(row_info, png_ptr->row_buf + 1); +#endif } -#endif /* PNG_MNG_FEATURES_SUPPORTED */ -#endif /* PNG_WRITE_SUPPORTED */ +#endif /* WRITE_TRANSFORMS */ +#endif /* WRITE */ |