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[libpng16] Added "& 0xff" to things being typecast to "png_byte".

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This commit is contained in:
Glenn Randers-Pehrson
2015-02-27 18:53:44 -06:00
parent 9a3de48b48
commit 7011a8cec3
12 changed files with 249 additions and 231 deletions
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51
pngwrite.c
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@@ -219,7 +219,7 @@ png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
int j;
for (j = 0; j<(int)info_ptr->num_trans; j++)
info_ptr->trans_alpha[j] =
(png_byte)(255 - info_ptr->trans_alpha[j]);
(png_byte)((255 - info_ptr->trans_alpha[j]) & 0xff);
}
#endif
png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
@@ -457,11 +457,11 @@ png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime)
png_debug(1, "in png_convert_from_struct_tm");
ptime->year = (png_uint_16)(1900 + ttime->tm_year);
ptime->month = (png_byte)(ttime->tm_mon + 1);
ptime->day = (png_byte)ttime->tm_mday;
ptime->hour = (png_byte)ttime->tm_hour;
ptime->minute = (png_byte)ttime->tm_min;
ptime->second = (png_byte)ttime->tm_sec;
ptime->month = (png_byte)((ttime->tm_mon + 1) & 0xff);
ptime->day = (png_byte)(ttime->tm_mday & 0xff);
ptime->hour = (png_byte)(ttime->tm_hour & 0xff);
ptime->minute = (png_byte)(ttime->tm_min & 0xff);
ptime->second = (png_byte)(ttime->tm_sec & 0xff);
}
void PNGAPI
@@ -811,7 +811,8 @@ png_write_row(png_structrp png_ptr, png_const_bytep row)
row_info.width = png_ptr->usr_width;
row_info.channels = png_ptr->usr_channels;
row_info.bit_depth = png_ptr->usr_bit_depth;
row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels);
row_info.pixel_depth =
(png_byte)(0xff & (row_info.bit_depth * row_info.channels));
row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
png_debug1(3, "row_info->color_type = %d", row_info.color_type);
@@ -1037,7 +1038,7 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
png_ptr->do_filter = PNG_FILTER_PAETH; break;
default:
png_ptr->do_filter = (png_byte)filters; break;
png_ptr->do_filter = (png_byte)(filters & 0xff); break;
#else
default:
png_app_error(png_ptr, "Unknown row filter for method 0");
@@ -1070,8 +1071,8 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Up filter after starting");
png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
~PNG_FILTER_UP);
png_ptr->do_filter =
(png_byte)((png_ptr->do_filter & ~PNG_FILTER_UP) & 0xff);
}
else
@@ -1088,8 +1089,8 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Average filter after starting");
png_ptr->do_filter = (png_byte)(png_ptr->do_filter &
~PNG_FILTER_AVG);
png_ptr->do_filter =
(png_byte)((png_ptr->do_filter & ~PNG_FILTER_AVG) & 0xff);
}
else
@@ -1106,7 +1107,7 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Paeth filter after starting");
png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
png_ptr->do_filter &= (png_byte)((~PNG_FILTER_PAETH) & 0xff);
}
else
@@ -1210,7 +1211,7 @@ png_init_filter_heuristics(png_structrp png_ptr, int heuristic_method,
}
/* Safe to set this now */
png_ptr->num_prev_filters = (png_byte)num_weights;
png_ptr->num_prev_filters = (png_byte)(num_weights & 0xff);
}
/* If, in the future, there are other filter methods, this would
@@ -1890,7 +1891,7 @@ png_unpremultiply(png_uint_32 component, png_uint_32 alpha,
component *= 255;
/* Convert the component to sRGB. */
return (png_byte)PNG_sRGB_FROM_LINEAR(component);
return (png_byte)(PNG_sRGB_FROM_LINEAR(component) & 0xff);
}
else
@@ -1939,7 +1940,7 @@ png_write_image_8bit(png_voidp argument)
while (out_ptr < row_end)
{
png_uint_16 alpha = in_ptr[aindex];
png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
png_byte alphabyte = (png_byte)(PNG_DIV257(alpha) & 0xff);
png_uint_32 reciprocal = 0;
int c;
@@ -1982,7 +1983,7 @@ png_write_image_8bit(png_voidp argument)
png_uint_32 component = *in_ptr++;
component *= 255;
*out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component);
*out_ptr++ = (png_byte)(PNG_sRGB_FROM_LINEAR(component) & 0xff);
}
png_write_row(png_ptr, output_row);
@@ -2041,23 +2042,23 @@ png_image_set_PLTE(png_image_write_control *display)
{
if (channels >= 3) /* RGB */
{
palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
entry[(2 ^ bgr)]);
palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
entry[1]);
palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 *
entry[bgr]);
palette[i].blue = (png_byte)(0xff & PNG_sRGB_FROM_LINEAR(255 *
entry[(2 ^ bgr)]));
palette[i].green = (png_byte)(0xff & PNG_sRGB_FROM_LINEAR(255 *
entry[1]));
palette[i].red = (png_byte)(0xff & PNG_sRGB_FROM_LINEAR(255 *
entry[bgr]));
}
else /* Gray */
palette[i].blue = palette[i].red = palette[i].green =
(png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry);
(png_byte)(PNG_sRGB_FROM_LINEAR((255 * *entry)) & 0xff);
}
else /* alpha */
{
png_uint_16 alpha = entry[afirst ? 0 : channels-1];
png_byte alphabyte = (png_byte)PNG_DIV257(alpha);
png_byte alphabyte = (png_byte)(PNG_DIV257(alpha) & 0xff);
png_uint_32 reciprocal = 0;
/* Calculate a reciprocal, as in the png_write_image_8bit code above