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68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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void save_pixels_as_ppm(uint32_t *pixels,
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int width,
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int height,
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const char *filepath)
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{
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FILE *f = fopen(filepath, "wb");
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if (!f) {
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fprintf(stderr, "Could not open file `%s`\n", filepath);
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exit(1);
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}
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fprintf(f,
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"P6\n"
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"%d %d\n"
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"255\n",
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width, height);
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for (int row = 0; row < height; ++row) {
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for (int col = 0; col < width; ++col) {
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uint32_t pixel = pixels[row * width + col];
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uint8_t c1 = pixel & 0xFF;
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uint8_t c2 = (pixel >> 8) & 0xFF;
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uint8_t c3 = (pixel >> 16) & 0xFF;
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putc(c3, f);
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putc(c2, f);
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putc(c1, f);
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}
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}
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fflush(f);
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fclose(f);
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}
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int main(int argc, char *argv[])
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{
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Display *display = XOpenDisplay(NULL);
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Window root = DefaultRootWindow(display);
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XWindowAttributes attributes = {0};
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XGetWindowAttributes(display, root, &attributes);
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XImage *img = XGetImage(display, root, 0, 0, attributes.width, attributes.height, AllPlanes, ZPixmap);
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printf("Width: %d\n", attributes.width);
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printf("Height: %d\n", attributes.height);
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printf("BPP: %d\n", img->bits_per_pixel);
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printf("Corner pixel: %u\n", *((uint32_t *)img->data));
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assert(img->bits_per_pixel == 32);
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save_pixels_as_ppm((uint32_t *)img->data, attributes.width, attributes.height, "screenshot.ppm");
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XDestroyImage(img);
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XCloseDisplay(display);
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return 0;
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}
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