diff options
| -rw-r--r-- | cqrlogo.c | 38 |
1 files changed, 24 insertions, 14 deletions
@@ -15,6 +15,11 @@ /* pixels are scaled up by this factor */ #define QRCODE_SCALE 2 + +/* width of the border + * this is defined to at least 4, but works well with less */ +# define QRCODE_BORDER 1 + /* error correction level used for QR code * possible values: QR_ECLEVEL_L (lowest, about 7% error can be corrected) * QR_ECLEVEL_M (about 15%) @@ -23,7 +28,7 @@ * image size raises with higher levels */ #define QRCODE_LEVEL QR_ECLEVEL_L -GdkPixbuf * encode_qrcode (char *text, int scale) { +GdkPixbuf * encode_qrcode (char *text, int scale, int border) { QRcode *qrcode; GdkPixbuf *pixbuf, *pixbuf_scaled; int i, j, k, rowstride, channels; @@ -37,23 +42,24 @@ GdkPixbuf * encode_qrcode (char *text, int scale) { data = qrcode->data; - pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, qrcode->width + 2, qrcode->width + 2); + pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, + qrcode->width + border * 2, qrcode->width + border * 2); pixel = gdk_pixbuf_get_pixels (pixbuf); rowstride = gdk_pixbuf_get_rowstride (pixbuf); channels = gdk_pixbuf_get_n_channels (pixbuf); gdk_pixbuf_fill(pixbuf, 0xffffffff); - for (i = 1; i <= qrcode->width; i++) - for (j = 1; j <= qrcode->width; j++) { + for (i = border; i < qrcode->width + border; i++) + for (j = border; j < qrcode->width + border; j++) { for (k = 0; k < channels; k++) pixel[i * rowstride + j * channels + k] = !(*data & 0x1) * 0xff; data++; } pixbuf_scaled = gdk_pixbuf_scale_simple (pixbuf, - (qrcode->width + 2) * scale, - (qrcode->width + 2) * scale, + (qrcode->width + border * 2) * scale, + (qrcode->width + border * 2) * scale, GDK_INTERP_NEAREST); QRcode_free(qrcode); @@ -70,7 +76,8 @@ int main(int argc, char **argv) { size_t bytes = 0; GdkPixbuf *pixbuf; - int scale = 0; + char *match = NULL; + int scale = QRCODE_SCALE, border = QRCODE_BORDER; gchar *buffer; gsize size; @@ -104,20 +111,23 @@ int main(int argc, char **argv) { free(pattern); } - /* do we have a special scale? */ - if (query_string) - sscanf(query_string, "scale=%u", &scale); + if (query_string ) { + /* do we have a special scale? */ + if ((match = strstr(query_string, "scale=")) != NULL) + sscanf(match, "scale=%u", &scale); - if (!scale) - scale = QRCODE_SCALE; + /* width of the border? */ + if ((match = strstr(query_string, "border=")) != NULL) + sscanf(match, "border=%u", &border); + } /* initialize type system for glib < 2.36 */ #ifndef GLIB_VERSION_2_36 g_type_init(); #endif - if ((pixbuf = encode_qrcode(http_referer, scale)) == NULL) { - if ((pixbuf = encode_qrcode(server_name, scale)) == NULL) { + if ((pixbuf = encode_qrcode(http_referer, scale, border)) == NULL) { + if ((pixbuf = encode_qrcode(server_name, scale, border)) == NULL) { fprintf(stderr, "Could not generate QR-Code.\n"); return EXIT_FAILURE; } |