X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..763163a80ae0d5a0684633e72f928302578c1214:/src/png/pngwtran.c diff --git a/src/png/pngwtran.c b/src/png/pngwtran.c index d85e01536e..0372fe656c 100644 --- a/src/png/pngwtran.c +++ b/src/png/pngwtran.c @@ -1,25 +1,28 @@ /* pngwtran.c - transforms the data in a row for PNG writers * - * libpng 1.0.1 + * Last changed in libpng 1.2.9 April 14, 2006 * 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 + * Copyright (c) 1998-2006 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" +#ifdef PNG_WRITE_SUPPORTED -/* Transform the data according to the users wishes. The order of +/* Transform the data according to the user's wishes. The order of * transformations is significant. */ -void +void /* PRIVATE */ png_do_write_transformations(png_structp png_ptr) { png_debug(1, "in png_do_write_transformations\n"); + if (png_ptr == NULL) + return; + #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) if (png_ptr->transformations & PNG_USER_TRANSFORM) if(png_ptr->write_user_transform_fn != NULL) @@ -48,23 +51,23 @@ png_do_write_transformations(png_structp png_ptr) png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, (png_uint_32)png_ptr->bit_depth); #endif +#if defined(PNG_WRITE_SWAP_SUPPORTED) + if (png_ptr->transformations & PNG_SWAP_BYTES) + png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); +#endif #if defined(PNG_WRITE_SHIFT_SUPPORTED) if (png_ptr->transformations & PNG_SHIFT) png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, &(png_ptr->shift)); #endif -#if defined(PNG_WRITE_SWAP_SUPPORTED) - if (png_ptr->transformations & PNG_SWAP_BYTES) - png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); +#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) + if (png_ptr->transformations & PNG_SWAP_ALPHA) + png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) if (png_ptr->transformations & PNG_INVERT_ALPHA) png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); #endif -#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) - if (png_ptr->transformations & PNG_SWAP_ALPHA) - png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); -#endif #if defined(PNG_WRITE_BGR_SUPPORTED) if (png_ptr->transformations & PNG_BGR) png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); @@ -80,7 +83,7 @@ png_do_write_transformations(png_structp png_ptr) * 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 +void /* PRIVATE */ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) { png_debug(1, "in png_do_pack\n"); @@ -97,12 +100,14 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) png_bytep sp, dp; int mask, v; png_uint_32 i; + png_uint_32 row_width = row_info->width; sp = row; dp = row; mask = 0x80; v = 0; - for (i = 0; i < row_info->width; i++) + + for (i = 0; i < row_width; i++) { if (*sp != 0) v |= mask; @@ -126,16 +131,17 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) png_bytep sp, dp; int shift, v; png_uint_32 i; + png_uint_32 row_width = row_info->width; sp = row; dp = row; shift = 6; v = 0; - for (i = 0; i < row_info->width; i++) + for (i = 0; i < row_width; i++) { png_byte value; - value = (png_byte)(*sp & 0x3); + value = (png_byte)(*sp & 0x03); v |= (value << shift); if (shift == 0) { @@ -157,16 +163,17 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) png_bytep sp, dp; int shift, v; png_uint_32 i; + png_uint_32 row_width = row_info->width; sp = row; dp = row; shift = 4; v = 0; - for (i = 0; i < row_info->width; i++) + for (i = 0; i < row_width; i++) { png_byte value; - value = (png_byte)(*sp & 0xf); + value = (png_byte)(*sp & 0x0f); v |= (value << shift); if (shift == 0) @@ -188,8 +195,8 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) } row_info->bit_depth = (png_byte)bit_depth; row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); - row_info->rowbytes = - ((row_info->width * row_info->pixel_depth + 7) >> 3); + row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, + row_info->width); } } #endif @@ -202,7 +209,7 @@ 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 +void /* PRIVATE */ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) { png_debug(1, "in png_do_shift\n"); @@ -214,9 +221,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) row_info->color_type != PNG_COLOR_TYPE_PALETTE) { int shift_start[4], shift_dec[4]; - png_uint_32 channels; + int channels = 0; - channels = 0; if (row_info->color_type & PNG_COLOR_MASK_COLOR) { shift_start[channels] = row_info->bit_depth - bit_depth->red; @@ -245,9 +251,10 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) /* with low row depths, could only be grayscale, so one channel */ if (row_info->bit_depth < 8) { - png_bytep bp; + png_bytep bp = row; png_uint_32 i; png_byte mask; + png_uint_32 row_bytes = row_info->rowbytes; if (bit_depth->gray == 1 && row_info->bit_depth == 2) mask = 0x55; @@ -256,7 +263,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) else mask = 0xff; - for (bp = row, i = 0; i < row_info->rowbytes; i++, bp++) + for (i = 0; i < row_bytes; i++, bp++) { png_uint_16 v; int j; @@ -274,27 +281,25 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) } else if (row_info->bit_depth == 8) { - png_bytep bp; + png_bytep bp = row; png_uint_32 i; + png_uint_32 istop = channels * row_info->width; - for (bp = row, i = 0; i < row_info->width; i++) + for (i = 0; i < istop; i++, bp++) { - png_uint_32 c; - for (c = 0; c < channels; c++, bp++) - { - png_uint_16 v; - int j; + png_uint_16 v; + int j; + int c = (int)(i%channels); - v = *bp; - *bp = 0; - for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) - { - if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); - else - *bp |= (png_byte)((v >> (-j)) & 0xff); - } + v = *bp; + *bp = 0; + for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) + { + if (j > 0) + *bp |= (png_byte)((v << j) & 0xff); + else + *bp |= (png_byte)((v >> (-j)) & 0xff); } } } @@ -302,28 +307,25 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) { png_bytep bp; png_uint_32 i; + png_uint_32 istop = channels * row_info->width; - for (bp = row, i = 0; i < row_info->width * row_info->channels; i++) + for (bp = row, i = 0; i < istop; i++) { - png_uint_32 c; + int c = (int)(i%channels); + png_uint_16 value, v; + int j; - for (c = 0; c < channels; c++, bp += 2) + v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); + value = 0; + for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { - png_uint_16 value, v; - int j; - - v = ((png_uint_16)(*bp) << 8) + *(bp + 1); - 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); - else - value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); - } - *bp = (png_byte)(value >> 8); - *(bp + 1) = (png_byte)(value & 0xff); + if (j > 0) + value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); + else + value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); } + *bp++ = (png_byte)(value >> 8); + *bp++ = (png_byte)(value & 0xff); } } } @@ -331,7 +333,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) #endif #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) -void +void /* PRIVATE */ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_write_swap_alpha\n"); @@ -345,12 +347,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) if (row_info->bit_depth == 8) { png_bytep sp, dp; - png_byte save; png_uint_32 i; - - for (i = 0, sp = dp = row; i < row_info->width; i++) + png_uint_32 row_width = row_info->width; + for (i = 0, sp = dp = row; i < row_width; i++) { - save = *(sp++); + png_byte save = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); @@ -361,11 +362,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) else { png_bytep sp, dp; - png_byte save[2]; png_uint_32 i; + png_uint_32 row_width = row_info->width; - for (i = 0, sp = dp = row; i < row_info->width; i++) + for (i = 0, sp = dp = row; i < row_width; i++) { + png_byte save[2]; save[0] = *(sp++); save[1] = *(sp++); *(dp++) = *(sp++); @@ -385,12 +387,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) if (row_info->bit_depth == 8) { png_bytep sp, dp; - png_byte save; png_uint_32 i; + png_uint_32 row_width = row_info->width; - for (i = 0, sp = dp = row; i < row_info->width; i++) + for (i = 0, sp = dp = row; i < row_width; i++) { - save = *(sp++); + png_byte save = *(sp++); *(dp++) = *(sp++); *(dp++) = save; } @@ -399,11 +401,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) else { png_bytep sp, dp; - png_byte save[2]; png_uint_32 i; + png_uint_32 row_width = row_info->width; - for (i = 0, sp = dp = row; i < row_info->width; i++) + for (i = 0, sp = dp = row; i < row_width; i++) { + png_byte save[2]; save[0] = *(sp++); save[1] = *(sp++); *(dp++) = *(sp++); @@ -418,7 +421,7 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) #endif #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) -void +void /* PRIVATE */ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { png_debug(1, "in png_do_write_invert_alpha\n"); @@ -433,13 +436,16 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { png_bytep sp, dp; png_uint_32 i; - - for (i = 0, sp = dp = row; i < row_info->width; i++) + png_uint_32 row_width = row_info->width; + for (i = 0, sp = dp = row; i < row_width; i++) { + /* does nothing *(dp++) = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); - *(dp++) = 255 - *(sp++); + */ + sp+=3; dp = sp; + *(dp++) = (png_byte)(255 - *(sp++)); } } /* This inverts the alpha channel in RRGGBBAA */ @@ -447,17 +453,21 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { png_bytep sp, dp; png_uint_32 i; + png_uint_32 row_width = row_info->width; - for (i = 0, sp = dp = row; i < row_info->width; i++) + for (i = 0, sp = dp = row; i < row_width; i++) { + /* does nothing *(dp++) = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); *(dp++) = *(sp++); - *(dp++) = 255 - *(sp++); - *(dp++) = 255 - *(sp++); + */ + sp+=6; dp = sp; + *(dp++) = (png_byte)(255 - *(sp++)); + *(dp++) = (png_byte)(255 - *(sp++)); } } } @@ -468,11 +478,12 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { png_bytep sp, dp; png_uint_32 i; + png_uint_32 row_width = row_info->width; - for (i = 0, sp = dp = row; i < row_info->width; i++) + for (i = 0, sp = dp = row; i < row_width; i++) { *(dp++) = *(sp++); - *(dp++) = 255 - *(sp++); + *(dp++) = (png_byte)(255 - *(sp++)); } } /* This inverts the alpha channel in GGAA */ @@ -480,16 +491,82 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) { png_bytep sp, dp; png_uint_32 i; + png_uint_32 row_width = row_info->width; - for (i = 0, sp = dp = row; i < row_info->width; i++) + for (i = 0, sp = dp = row; i < row_width; i++) { + /* does nothing *(dp++) = *(sp++); *(dp++) = *(sp++); - *(dp++) = 255 - *(sp++); - *(dp++) = 255 - *(sp++); + */ + sp+=2; dp = sp; + *(dp++) = (png_byte)(255 - *(sp++)); + *(dp++) = (png_byte)(255 - *(sp++)); } } } } } #endif + +#if defined(PNG_MNG_FEATURES_SUPPORTED) +/* undoes intrapixel differencing */ +void /* PRIVATE */ +png_do_write_intrapixel(png_row_infop row_info, png_bytep row) +{ + png_debug(1, "in png_do_write_intrapixel\n"); + if ( +#if defined(PNG_USELESS_TESTS_SUPPORTED) + row != NULL && row_info != NULL && +#endif + (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 (row_info->color_type == PNG_COLOR_TYPE_RGB) + bytes_per_pixel = 3; + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + bytes_per_pixel = 4; + else + return; + + 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); + } + } + else if (row_info->bit_depth == 16) + { + png_bytep rp; + png_uint_32 i; + + if (row_info->color_type == PNG_COLOR_TYPE_RGB) + bytes_per_pixel = 6; + else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) + bytes_per_pixel = 8; + else + return; + + 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_MNG_FEATURES_SUPPORTED */ +#endif /* PNG_WRITE_SUPPORTED */