259 lines
6.1 KiB
C
259 lines
6.1 KiB
C
/*
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* Example libfprint continuous image capture program
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* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libfprint/fprint.h>
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#include <X11/Xlib.h>
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#include <X11/keysym.h>
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#include <X11/extensions/Xvlib.h>
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#define FORMAT 0x32595559
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static int adaptor = -1;
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static unsigned char *framebuffer = NULL;
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static Display *display = NULL;
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static Window window=(Window)NULL;
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static XvImage *xv_image = NULL;
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static XvAdaptorInfo *info;
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static GC gc;
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static int connection = -1;
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/* based on macro by Bart Nabbe */
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#define GREY2YUV(grey, y, u, v)\
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y = (9798*grey + 19235*grey + 3736*grey) / 32768;\
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u = (-4784*grey - 9437*grey + 14221*grey) / 32768 + 128;\
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v = (20218*grey - 16941*grey - 3277*grey) / 32768 + 128;\
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y = y < 0 ? 0 : y;\
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u = u < 0 ? 0 : u;\
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v = v < 0 ? 0 : v;\
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y = y > 255 ? 255 : y;\
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u = u > 255 ? 255 : u;\
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v = v > 255 ? 255 : v
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static void grey2yuy2 (unsigned char *grey, unsigned char *YUV, int num) {
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int i, j;
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int y0, y1, u0, u1, v0, v1;
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int gval;
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for (i = 0, j = 0; i < num; i += 2, j += 4)
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{
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gval = grey[i];
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GREY2YUV (gval, y0, u0 , v0);
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gval = grey[i + 1];
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GREY2YUV (gval, y1, u1 , v1);
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YUV[j + 0] = y0;
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YUV[j + 1] = (u0+u1)/2;
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YUV[j + 2] = y1;
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YUV[j + 3] = (v0+v1)/2;
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}
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}
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static void display_frame(struct fp_img *img)
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{
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int width = fp_img_get_width(img);
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int height = fp_img_get_height(img);
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unsigned char *data = fp_img_get_data(img);
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if (adaptor < 0)
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return;
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grey2yuy2(data, framebuffer, width * height);
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xv_image = XvCreateImage(display, info[adaptor].base_id, FORMAT,
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framebuffer, width, height);
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XvPutImage(display, info[adaptor].base_id, window, gc, xv_image,
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0, 0, width, height, 0, 0, width, height);
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}
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static void QueryXv()
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{
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int num_adaptors;
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int num_formats;
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XvImageFormatValues *formats = NULL;
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int i,j;
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char xv_name[5];
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XvQueryAdaptors(display, DefaultRootWindow(display), &num_adaptors,
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&info);
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for(i = 0; i < num_adaptors; i++) {
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formats = XvListImageFormats(display, info[i].base_id,
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&num_formats);
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for(j = 0; j < num_formats; j++) {
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xv_name[4] = 0;
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memcpy(xv_name, &formats[j].id, 4);
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if(formats[j].id == FORMAT) {
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printf("using Xv format 0x%x %s %s\n",
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formats[j].id, xv_name,
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(formats[j].format==XvPacked)
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? "packed" : "planar");
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if (adaptor < 0)
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adaptor = i;
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}
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}
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}
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XFree(formats);
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if (adaptor < 0)
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printf("No suitable Xv adaptor found\n");
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}
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struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
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{
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struct fp_dscv_dev *ddev = discovered_devs[0];
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struct fp_driver *drv;
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if (!ddev)
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return NULL;
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drv = fp_dscv_dev_get_driver(ddev);
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printf("Found device claimed by %s driver\n", fp_driver_get_full_name(drv));
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return ddev;
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}
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int main(void)
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{
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int r = 1;
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XEvent xev;
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XGCValues xgcv;
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long background=0x010203;
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struct fp_dscv_dev *ddev;
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struct fp_dscv_dev **discovered_devs;
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struct fp_dev *dev;
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int img_width;
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int img_height;
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int standardize = 0;
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r = fp_init();
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if (r < 0) {
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fprintf(stderr, "Failed to initialize libfprint\n");
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exit(1);
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}
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fp_set_debug(3);
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discovered_devs = fp_discover_devs();
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if (!discovered_devs) {
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fprintf(stderr, "Could not discover devices\n");
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goto out;
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}
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ddev = discover_device(discovered_devs);
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if (!ddev) {
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fprintf(stderr, "No devices detected.\n");
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goto out;
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}
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dev = fp_dev_open(ddev);
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fp_dscv_devs_free(discovered_devs);
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if (!dev) {
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fprintf(stderr, "Could not open device.\n");
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goto out;
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}
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if (!fp_dev_supports_imaging(dev)) {
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fprintf(stderr, "this device does not have imaging capabilities.\n");
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goto out_close;
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}
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img_width = fp_dev_get_img_width(dev);
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img_height = fp_dev_get_img_height(dev);
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if (img_width <= 0 || img_height <= 0) {
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fprintf(stderr, "this device returns images with variable dimensions,"
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" this example does not support that.\n");
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goto out_close;
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}
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framebuffer = malloc(img_width * img_height * 2);
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if (!framebuffer)
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goto out_close;
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/* make the window */
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display = XOpenDisplay(getenv("DISPLAY"));
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if(display == NULL) {
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fprintf(stderr,"Could not open display \"%s\"\n",
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getenv("DISPLAY"));
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goto out_close;
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}
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QueryXv();
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if (adaptor < 0)
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goto out_close;
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window = XCreateSimpleWindow(display, DefaultRootWindow(display), 0, 0,
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img_width, img_height, 0,
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WhitePixel(display, DefaultScreen(display)), background);
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XSelectInput(display, window, StructureNotifyMask | KeyPressMask);
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XMapWindow(display, window);
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connection = ConnectionNumber(display);
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gc = XCreateGC(display, window, 0, &xgcv);
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printf("Press S to toggle standardized mode, Q to quit\n");
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while (1) { /* event loop */
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struct fp_img *img;
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r = fp_dev_img_capture(dev, 1, &img);
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if (r) {
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fprintf(stderr, "image capture failed, code %d\n", r);
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goto out_close;
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}
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if (standardize)
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fp_img_standardize(img);
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display_frame(img);
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fp_img_free(img);
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XFlush(display);
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while (XPending(display) > 0) {
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XNextEvent(display, &xev);
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if (xev.type != KeyPress)
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continue;
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switch (XKeycodeToKeysym(display, xev.xkey.keycode, 0)) {
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case XK_q:
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case XK_Q:
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r = 0;
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goto out_close;
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break;
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case XK_s:
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case XK_S:
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standardize = !standardize;
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break;
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}
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} /* XPending */
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}
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r = 0;
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out_close:
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if (framebuffer)
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free(framebuffer);
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fp_dev_close(dev);
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if ((void *) window != NULL)
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XUnmapWindow(display, window);
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if (display != NULL)
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XFlush(display);
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out:
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fp_exit();
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return r;
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}
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