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-rw-r--r--cqrlogo.c38
1 files changed, 24 insertions, 14 deletions
diff --git a/cqrlogo.c b/cqrlogo.c
index 1cb4eb4..88a637a 100644
--- a/cqrlogo.c
+++ b/cqrlogo.c
@@ -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;
}