X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..adac097759c089b3d47f48c7756ace4f0b8df879:/src/png/pngtrans.c diff --git a/src/png/pngtrans.c b/src/png/pngtrans.c index d38dbd19de..397c988f07 100644 --- a/src/png/pngtrans.c +++ b/src/png/pngtrans.c @@ -1,12 +1,11 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * libpng 1.0.1 + * 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, Glenn Randers-Pehrson - * March 15, 1998 + * Copyright (c) 1998, 1999 Glenn Randers-Pehrson */ #define PNG_INTERNAL @@ -87,8 +86,8 @@ 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 png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) @@ -101,11 +100,23 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) 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_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; + } } #endif @@ -137,7 +148,7 @@ png_set_invert_mono(png_structp png_ptr) png_ptr->transformations |= PNG_INVERT_MONO; } -/* invert monocrome grayscale data */ +/* invert monochrome grayscale data */ void png_do_invert(png_row_infop row_info, png_bytep row) { @@ -148,12 +159,14 @@ png_do_invert(png_row_infop row_info, png_bytep row) #endif row_info->color_type == PNG_COLOR_TYPE_GRAY) { - 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++) { *rp = (png_byte)(~(*rp)); + rp++; } } } @@ -171,15 +184,13 @@ png_do_swap(png_row_infop row_info, png_bytep row) #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; } @@ -338,6 +349,11 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) 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->channels == 4) { if (row_info->bit_depth == 8) @@ -345,10 +361,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) /* 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 +373,7 @@ 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++; @@ -371,17 +382,15 @@ 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): png_memcpy(dp, sp, 6); @@ -399,17 +408,15 @@ 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): png_memcpy(dp, sp, 6); sp += 8; dp += 6; */ + sp+=2; *dp++ = *sp++; *dp++ = *sp++; *dp++ = *sp++; @@ -419,9 +426,10 @@ 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; + row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; } /* else if (row_info->color_type == PNG_COLOR_TYPE_GRAY || @@ -434,10 +442,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) /* 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 +451,22 @@ 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 +475,8 @@ 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++; @@ -487,9 +484,10 @@ 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; + row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; } } } @@ -507,17 +505,17 @@ png_do_bgr(png_row_infop row_info, png_bytep row) #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 +523,11 @@ 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 +538,31 @@ 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; } } }