diff options
Diffstat (limited to 'xnap.c')
| -rw-r--r-- | xnap.c | 27 |
1 files changed, 11 insertions, 16 deletions
@@ -27,7 +27,7 @@ struct pointer_t { unsigned char channel(unsigned long px, Mask m); void compimg(void); void die(const char* s); -void mkppm(const char* path, XImage* img); +void mkppm(XImage* img); void quit(Bool ex); void run(void); void setup(void); @@ -74,11 +74,14 @@ void compimg(void) int rw = MAX(p.x0, p.x1) - rx; int rh = MAX(p.y0, p.y1) - ry; + if (rw <= 0 || rh <= 0) + die("empty selection"); + img = XGetImage(dpy, root, rx, ry, rw, rh, AllPlanes, ZPixmap); if (!img) die("XGetImage failed"); - mkppm("img.ppm", img); + mkppm(img); XDestroyImage(img); quit(True); } @@ -89,29 +92,21 @@ void die(const char* s) exit(EXIT_FAILURE); } -void mkppm(const char* path, XImage* img) +void mkppm(XImage* img) { - FILE* f = fopen(path, "w"); - if (!f) - die("fopen failed"); + FILE* out = stdout; /* write ppm metadata header */ - fprintf(f, "P6\n%d %d\n255\n", img->width, img->height); + fprintf(out, "P6\n%d %d\n255\n", img->width, img->height); for (int y = 0; y < img->height; y++) { for (int x = 0; x < img->width; x++) { unsigned long px = XGetPixel(img, x, y); - unsigned char r = channel(px, img->red_mask); - unsigned char g = channel(px, img->green_mask); - unsigned char b = channel(px, img->blue_mask); - - fputc(r, f); - fputc(g, f); - fputc(b, f); + fputc(channel(px, img->red_mask), out); + fputc(channel(px, img->green_mask), out); + fputc(channel(px, img->blue_mask), out); } } - - fclose(f); } void quit(Bool ex) |