Attachment 9595 Details for Bug 10508 – xlib test case

xlib test case

slice.c (text/plain), 4.24 KB, created by Carl Worth on 2007-04-13 11:06:15 UTC

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Creator: Carl Worth

Created: 2007-04-13 11:06:15 UTC

Size: 4.24 KB

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>/* gcc `pkg-config --cflags --libs cairo-xlib` -o slice slice.c
> *
> * Test case demonstrating cairo bug #10508:
> *
> *	Transformed image source surfaces sometimes misrender to xlib surface target
> *	https://bugs.freedesktop.org/show_bug.cgi?id=10508
> *
> * This test case draws a transformed image to a window by continually
> * drawing the image over and over in single-pixel columns. The
> * results should be a static image showing four quadrants of
> * different colors, (with expected fading on the edges).
> *
> * The bug manifests itself by vertical mis-colored lines that appear
> * to sweep across the image as it redraws. The bug is intermittent,
> * but making your X server busy, (by, say, moving a window around),
> * appears to make it occur more regularly.
> */
>#include <stdio.h>
>#include <stdint.h>
>#include <stdlib.h>
>#include <unistd.h>
>
>#include <cairo.h>
>#include <cairo-xlib.h>
>#include <X11/Xutil.h> /* for Region */
>
>static void
>expose (Display *dpy,
>	Window window,
>	int window_width,
>	int window_height,
>	cairo_surface_t *image,
>	int extents_x,
>	int extents_y,
>	int extents_width,
>	int extents_height)
>{
>    Pixmap pixmap;
>    cairo_surface_t *backing;
>    cairo_t *cr;
>    cairo_matrix_t matrix;
>    cairo_pattern_t *pattern;
>    XGCValues gcv;
>    GC gc;
>
>    gcv.function = GXcopy;
>    gcv.foreground = WhitePixel (dpy, DefaultScreen (dpy));
>    gc = XCreateGC (dpy, window, GCFunction | GCForeground, &gcv);
>
>    pixmap = XCreatePixmap (dpy, window, extents_width, extents_height,
>			    DefaultDepth (dpy, DefaultScreen (dpy)));
>    /* Clear background to white. */
>    XFillRectangle (dpy, pixmap, gc, 0, 0, extents_width, extents_height);
>
>    backing = cairo_xlib_surface_create (dpy, pixmap,
>					 DefaultVisual (dpy, DefaultScreen (dpy)),
>					 extents_width, extents_height);
>
>    cr = cairo_create (backing);
>
>    /* Draw the scaled image surface */
>    cairo_translate (cr, - extents_x, - extents_y);
>    cairo_scale (cr, 20, 20);
>
>    pattern = cairo_pattern_create_for_surface (image);
>    cairo_matrix_init_translate (&matrix, - 0.5, - 0.5);
>    cairo_pattern_set_matrix (pattern, &matrix);
>    cairo_set_source (cr, pattern);
>
>    cairo_identity_matrix (cr);
>    cairo_paint (cr);
>
>    cairo_pattern_destroy (pattern);
>
>    cairo_destroy (cr);
>    cairo_surface_destroy (backing);
>
>    XCopyArea (dpy, pixmap, window, gc, 0, 0,
>	       extents_width, extents_height,
>	       extents_x, extents_y);
>
>    XFreePixmap (dpy, pixmap);
>    XFreeGC (dpy, gc);
>}
>
>int
>main (void)
>{
>    Display *dpy;
>    Window root, window;
>    int screen;
>    int window_width = 100, window_height = 100;
>    cairo_surface_t *source;
>    KeyCode quit_code;
>    XEvent xev;
>    int i;
>
>#define SOURCE_SIZE 4
>    static uint32_t data[SOURCE_SIZE * SOURCE_SIZE] = {
>	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,
>	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,
>
>	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff,
>	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff
>    };
>
>    source = cairo_image_surface_create_for_data ((unsigned char *) data,
>						  CAIRO_FORMAT_RGB24,
>						  SOURCE_SIZE,
>						  SOURCE_SIZE,
>						  SOURCE_SIZE * 4);
>
>    dpy = XOpenDisplay(0);
>    if (dpy == NULL) {
>	fprintf(stderr, "Failed to open display\n");
>	return 1;
>    }
>
>    XSynchronize (dpy, 1);
>
>    root = DefaultRootWindow(dpy);
>    screen = DefaultScreen(dpy);
>
>    window = XCreateSimpleWindow(dpy, root, 0, 0,
>				 window_width, window_height, 0,
>				 BlackPixel(dpy, screen), BlackPixel(dpy, screen));
>
>    quit_code = XKeysymToKeycode(dpy, XStringToKeysym("Q"));
>
>    XSelectInput(dpy, window,
>		 KeyPressMask
>		 |ExposureMask
>		 |ButtonPressMask);
>
>    XMapWindow(dpy, window);
>
>    /* Wait for first expose xev. */
>    XWindowEvent(dpy, window, ExposureMask, &xev);
>
>    /* Draw to demonstrate bug. */
>    expose (dpy, window,
>	    window_width, window_height,
>	    source,
>	    0, 0, 100, 100);
>
>    while (1) {
>	for (i = 0; i < 100; i ++) {
>	    /* Quit on any key/button press to exit */
>	    if (XCheckWindowEvent(dpy, window, KeyPressMask|ButtonPressMask, &xev))
>		goto DONE;
>	    expose (dpy, window,
>		    window_width, window_height,
>		    source,
>		    i, 0, 1, 100);
>	    usleep (10000);
>	}
>    }
>  DONE:
>
>    cairo_surface_destroy (source);
>    XCloseDisplay (dpy);
>    cairo_debug_reset_static_data ();
>
>    return 0;
>}

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Attachments on bug 10508: 9441 | 9499 | 9595 | 9596

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