diff --git a/ChangeLog b/ChangeLog index e28f29c74..4b853d293 100644 --- a/ChangeLog +++ b/ChangeLog @@ -5,6 +5,11 @@ 2005-01-13 Carl Worth + * test/leaky_polygon.c: + * test/Makefile.am + * test/.cvsignore: Add leaky_polygon test for trapezoid + rasterization corner case. + * src/cairo_xlib_surface.c: * src/cairo_glitz_surface.c: * src/cairo_ft_font.c: diff --git a/test/.cvsignore b/test/.cvsignore index ca4c6e56c..27e57c1d4 100644 --- a/test/.cvsignore +++ b/test/.cvsignore @@ -3,6 +3,7 @@ Makefile Makefile.in fill_rule +leaky_polygon line_width move_to_show_surface text_cache_crash diff --git a/test/Makefile.am b/test/Makefile.am index e0e5b0789..7ade75916 100644 --- a/test/Makefile.am +++ b/test/Makefile.am @@ -1,6 +1,7 @@ # All new test cases go here TESTS = \ fill_rule \ +leaky_polygon \ line_width \ move_to_show_surface \ text_cache_crash \ @@ -11,6 +12,7 @@ text_rotate # here? EXTRA_DIST = \ fill_rule-ref.png \ +leaky_polygon.png \ line_width-ref.png \ move_to_show_surface-ref.png \ text_rotate-ref.png @@ -52,6 +54,7 @@ xmalloc.h # time to break down and auto-generate the Makefile.am or something # from autogen.sh. My, but this is painful... fill_rule_SOURCES = fill_rule.c $(cairo_test_lib) +leaky_polygon_SOURCES = leaky_polygon.c $(cairo_test_lib) line_width_SOURCES = line_width.c $(cairo_test_lib) move_to_show_surface_SOURCES = move_to_show_surface.c $(cairo_test_lib) text_cache_crash_SOURCES = text_cache_crash.c $(cairo_test_lib) diff --git a/test/leaky-polygon-ref.png b/test/leaky-polygon-ref.png new file mode 100644 index 000000000..b33622661 Binary files /dev/null and b/test/leaky-polygon-ref.png differ diff --git a/test/leaky-polygon.c b/test/leaky-polygon.c new file mode 100644 index 000000000..39daf4ca3 --- /dev/null +++ b/test/leaky-polygon.c @@ -0,0 +1,82 @@ +/* + * Copyright © 2005 Red Hat, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without + * fee, provided that the above copyright notice appear in all copies + * and that both that copyright notice and this permission notice + * appear in supporting documentation, and that the name of + * Red Hat, Inc. not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Red Hat, Inc. makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL, + * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Author: Carl D. Worth + */ + +/* Bug history + * + * 2005-01-07 Carl Worth + * + * Bug reported: + * + * From: Chris + * Subject: [cairo] Render to image buffer artifacts + * To: cairo@cairographics.org + * Date: Fri, 07 Jan 2005 02:22:28 -0500 + * + * I've attached the code and image that shows this off. Scaling at + * different levels seems to change the corruption. + * + * For some reason there are artifacts in the alpha channel. I don't know + * if that's the only place, but the alpha channel looks bad. + * + * If you run the code and parse the attached image, directing stdout to a + * file, you can see in the lower left corner there are alpha values where + * it should be transparent. + * [...] + * + * 2005-01-11 Carl Worth + * + * I trimmed the original test case down to the code that appears here. + * + */ + +#include "cairo_test.h" + +#define WIDTH 21 +#define HEIGHT 21 + +cairo_test_t test = { + "leaky_polygon", + "Exercises a corner case in the trapezoid rasterization in which pixels outside the trapezoids received a non-zero alpha", + WIDTH, HEIGHT +}; + +static void +draw (cairo_t *cr, int width, int height) +{ + cairo_scale (cr, 1.0/(1<<16), 1.0/(1<<16)); + + cairo_move_to (cr, 131072,39321); + cairo_line_to (cr, 1103072,1288088); + cairo_line_to (cr, 1179648,1294990); + cairo_close_path (cr); + + cairo_fill (cr); +} + +int +main (void) +{ + return cairo_test (&test, draw); +} diff --git a/test/leaky_polygon-ref.png b/test/leaky_polygon-ref.png new file mode 100644 index 000000000..b33622661 Binary files /dev/null and b/test/leaky_polygon-ref.png differ diff --git a/test/leaky_polygon.c b/test/leaky_polygon.c new file mode 100644 index 000000000..39daf4ca3 --- /dev/null +++ b/test/leaky_polygon.c @@ -0,0 +1,82 @@ +/* + * Copyright © 2005 Red Hat, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without + * fee, provided that the above copyright notice appear in all copies + * and that both that copyright notice and this permission notice + * appear in supporting documentation, and that the name of + * Red Hat, Inc. not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Red Hat, Inc. makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL, + * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Author: Carl D. Worth + */ + +/* Bug history + * + * 2005-01-07 Carl Worth + * + * Bug reported: + * + * From: Chris + * Subject: [cairo] Render to image buffer artifacts + * To: cairo@cairographics.org + * Date: Fri, 07 Jan 2005 02:22:28 -0500 + * + * I've attached the code and image that shows this off. Scaling at + * different levels seems to change the corruption. + * + * For some reason there are artifacts in the alpha channel. I don't know + * if that's the only place, but the alpha channel looks bad. + * + * If you run the code and parse the attached image, directing stdout to a + * file, you can see in the lower left corner there are alpha values where + * it should be transparent. + * [...] + * + * 2005-01-11 Carl Worth + * + * I trimmed the original test case down to the code that appears here. + * + */ + +#include "cairo_test.h" + +#define WIDTH 21 +#define HEIGHT 21 + +cairo_test_t test = { + "leaky_polygon", + "Exercises a corner case in the trapezoid rasterization in which pixels outside the trapezoids received a non-zero alpha", + WIDTH, HEIGHT +}; + +static void +draw (cairo_t *cr, int width, int height) +{ + cairo_scale (cr, 1.0/(1<<16), 1.0/(1<<16)); + + cairo_move_to (cr, 131072,39321); + cairo_line_to (cr, 1103072,1288088); + cairo_line_to (cr, 1179648,1294990); + cairo_close_path (cr); + + cairo_fill (cr); +} + +int +main (void) +{ + return cairo_test (&test, draw); +}