Attachment 38392 Details for Bug 29986 – gcc testcase.c -lX11, run, watch testcase_out.ppm

gcc testcase.c -lX11, run, watch testcase_out.ppm

testcase.c (text/x-c), 1.52 KB, created by Christian Authmann on 2010-09-02 17:12:02 UTC

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Creator: Christian Authmann

Created: 2010-09-02 17:12:02 UTC

Size: 1.52 KB

patch

obsolete

>
>#include <stdio.h>
>#include <stdlib.h>
>#include <X11/Xlib.h>
>#include <X11/Xutil.h>
>
>
>int main()
>{
>	Display *display;
>	Window root;
>	XImage *image;
>	unsigned long display_width, display_height, x, y;
>	FILE *f;
>
>
>	display = XOpenDisplay(NULL);
>	if (!display)
>	{
>		printf("no display\n");
>		exit(5);
>	}
>
>	root = XRootWindow(display,XDefaultScreen(display));
>
>/*	XGrabServer(display); */
>
>	display_width = XDisplayWidth(display,XDefaultScreen(display));
>	display_height = XDisplayHeight(display,XDefaultScreen(display));
>
>/*
>	passing ZPixmap yields a corrupted image. EVERGREENDownloadFromScreen() is called several times, only reading as many horizontal lines as fit into 16k.
>	passing XYPixmap instead of ZPixmap yields a flawless image. Tests show that EVERGREENDownloadFromScreen() isn't called in that case.
>*/
>	image = XGetImage(display, root, 0, 0, display_width, display_height, AllPlanes, ZPixmap);
>
>/*	XUngrabServer(display); */
>
>
>	/* very crude (and slow) way to dump the image to a .ppm */
>	f = fopen("testcase_out.ppm", "wb");
>	fprintf(f, "P3\n");
>	fprintf(f, "%d %d\n255\n", image->width, image->height);
>	for (y=0;y<image->height;y++)
>	{
>		for (x=0;x<image->width;x++)
>		{
>			int r,g,b;
>			unsigned long color;
>			color = XGetPixel(image, x, y);
>			/* make some wild assumptions about colors, because I don't have a clue. */
>			r = ((color) & 0xff0000) >> 16;
>			g = ((color) & 0x00ff00) >> 8;
>			b = ((color) & 0x0000ff);
>			fprintf(f, "%d %d %d ", r, g, b);
>		}
>		fprintf(f, "\n");
>	}
>
>	fclose(f);
>
>	XDestroyImage(image);
>
>	return 0;
>}
>

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Attachments on bug 29986: 38392 | 38393 | 38403 | 38590

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