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Add option for PNG without alpha channel #187

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Add option for PNG without alpha channel #187

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7 changes: 6 additions & 1 deletion qrenc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@ static int rle = 0;
static int svg_path = 0;
static int micro = 0;
static int inline_svg = 0;
static int png_no_alpha = 0;
static int strict_versioning = 0;
static QRecLevel level = QR_ECLEVEL_L;
static QRencodeMode hint = QR_MODE_8;
Expand Down Expand Up @@ -93,6 +94,7 @@ static const struct option options[] = {
{"svg-path" , no_argument , &svg_path, 1},
{"inline" , no_argument , &inline_svg, 1},
{"strict-version", no_argument , &strict_versioning, 1},
{"png-no-alpha" , no_argument , &png_no_alpha, 1},
{"foreground" , required_argument, NULL, 'f'},
{"background" , required_argument, NULL, 'b'},
{"version" , no_argument , NULL, 'V'},
Expand Down Expand Up @@ -155,6 +157,8 @@ static void usage(int help, int longopt, int status)
" specify foreground/background color in hexadecimal notation.\n"
" 6-digit (RGB) or 8-digit (RGBA) form are supported.\n"
" Color output support available only in PNG, EPS and SVG.\n\n"
" --png-no-alpha\n"
" do not add alpha channel in PNG output.\n\n"
" --strict-version\n"
" disable automatic version number adjustment. If the input data is\n"
" too large for the specified version, the program exits with the\n"
Expand Down Expand Up @@ -359,7 +363,8 @@ static int writePNG(const QRcode *qrcode, const char *outfile, enum imageType ty
alpha_values[0] = fg_color[3];
alpha_values[1] = bg_color[3];
png_set_PLTE(png_ptr, info_ptr, palette, 2);
png_set_tRNS(png_ptr, info_ptr, alpha_values, 2, NULL);
if (!png_no_alpha)
png_set_tRNS(png_ptr, info_ptr, alpha_values, 2, NULL);
}

png_init_io(png_ptr, fp);
Expand Down
3 changes: 3 additions & 0 deletions qrencode.1.in
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Expand Up @@ -85,6 +85,9 @@ specify foreground/background color in hexadecimal notation.
6-digit (RGB) or 8-digit (RGBA) form are supported.
Color output support available only in PNG, EPS and SVG.
.TP
.B \-\-png-no-alpha
do not add alpha channel in PNG output.
.TP
.B \-\-strict\-version
disable automatic version number adjustment. If the input data is
too large for the specified version, the program exits with the
Expand Down