New test case, covering various combinations of pattern types, drawing operations and clipping. Currently fails, for some combinations, coverage-ref.png is just a placeholder.

Added this PNG from cairo-snippets to use for pattern fills.
expose PNG loading to test cases.

ChangeLog

@@ -1,3 +1,16 @@
+2005-01-26  Kristian Høgsberg  <krh@redhat.com>
+
+	* test/Makefile.am, test/coverage.c, test/coverage-ref.png: New
+	test case, covering various combinations of pattern types, drawing
+	operations and clipping.  Currently fails, for some combinations,
+	coverage-ref.png is just a placeholder.
+
+	* test/romedalen.png: Added this PNG from cairo-snippets to use
+	for pattern fills.
+
+	* test/cairo_test.c, test/cairo_test.h: expose PNG loading to test
+	cases.
+
 2005-01-26  Alexander Larsson  <alexl@redhat.com>
 
 	* src/cairo_ft_font.c: (_ft_unscaled_font_set_scale):

test/Makefile.am

@@ -5,7 +5,8 @@ leaky_polygon		\
 line_width		\
 move_to_show_surface	\
 text_cache_crash	\
-text_rotate
+text_rotate		\
+coverage
 
 # And all new test go here too. I really don't like having to repeat
 # this list. Anyone know a good way to avoid it? Can I use a wildcard
@@ -29,7 +30,8 @@ move_to_show_surface-ref.png
 # be fixed before the code is committed.
 XFAIL_TESTS =		\
 move_to_show_surface	\
-text_rotate
+text_rotate		\
+coverage
 
 check_PROGRAMS = $(TESTS)
 
@@ -62,6 +64,7 @@ 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)
 text_rotate_SOURCES = text_rotate.c $(cairo_test_lib)
+coverage_SOURCES = coverage.c $(cairo_test_lib)
 
 noinst_PROGRAMS = imagediff
 imagediff_SOURCES = imagediff.c $(cairo_test_lib)

test/cairo-test.c

@@ -166,3 +166,26 @@ BAIL:
 
     return ret;
 }
+
+cairo_pattern_t *
+cairo_test_create_png_pattern (cairo_t *cr, const char *filename)
+{
+    cairo_surface_t *image;
+    cairo_pattern_t *pattern;
+    unsigned char *buffer;
+    int w, h, stride;
+    read_png_status_t status;
+
+    status = read_png_argb32 (filename, &buffer, &w,&h, &stride);
+    if (status != READ_PNG_SUCCESS)
+	return NULL;
+
+    image = cairo_surface_create_for_image (buffer, CAIRO_FORMAT_ARGB32,
+					    w, h, stride);
+
+    cairo_surface_set_repeat (image, 1);
+
+    pattern = cairo_pattern_create_for_surface (image);
+
+    return pattern;
+}

test/cairo-test.h

@@ -47,5 +47,9 @@ typedef void  (*cairo_test_draw_function_t) (cairo_t *cr, int width, int height)
 cairo_test_status_t
 cairo_test (cairo_test_t *test, cairo_test_draw_function_t draw);
 
+cairo_pattern_t *
+cairo_test_create_png_pattern (cairo_t *cr, const char *filename);
+
+
 #endif
 

test/cairo_test.c

@@ -166,3 +166,26 @@ BAIL:
 
     return ret;
 }
+
+cairo_pattern_t *
+cairo_test_create_png_pattern (cairo_t *cr, const char *filename)
+{
+    cairo_surface_t *image;
+    cairo_pattern_t *pattern;
+    unsigned char *buffer;
+    int w, h, stride;
+    read_png_status_t status;
+
+    status = read_png_argb32 (filename, &buffer, &w,&h, &stride);
+    if (status != READ_PNG_SUCCESS)
+	return NULL;
+
+    image = cairo_surface_create_for_image (buffer, CAIRO_FORMAT_ARGB32,
+					    w, h, stride);
+
+    cairo_surface_set_repeat (image, 1);
+
+    pattern = cairo_pattern_create_for_surface (image);
+
+    return pattern;
+}

test/cairo_test.h

@@ -47,5 +47,9 @@ typedef void  (*cairo_test_draw_function_t) (cairo_t *cr, int width, int height)
 cairo_test_status_t
 cairo_test (cairo_test_t *test, cairo_test_draw_function_t draw);
 
+cairo_pattern_t *
+cairo_test_create_png_pattern (cairo_t *cr, const char *filename);
+
+
 #endif
 

test/coverage.c

@@ -0,0 +1,181 @@
+/*
+ * 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: Kristian Høgsberg <krh@redhat.com>
+ */
+
+#include <math.h>
+#include "cairo_test.h"
+
+#define WIDTH 64
+#define HEIGHT 64
+#define PAD 10
+
+/* XXX The test image uses Bitstream Vera Sans as the font - how do we
+ * ensure that it's available?  Can we ship it with this test? */
+
+const char	fontname[]	= "Bitstream Vera Sans";
+const int	fontsize	= 40;
+const char	png_filename[]	= "romedalen.png";
+
+static void
+set_solid_pattern (cairo_t *cr, int x, int y)
+{
+    cairo_set_rgb_color (cr, 0, 0, 0.6);
+    cairo_set_alpha (cr, 1.0);
+}
+
+static void
+set_translucent_pattern (cairo_t *cr, int x, int y)
+{
+    cairo_set_rgb_color (cr, 0, 0, 0.6);
+    cairo_set_alpha (cr, 0.5);
+}
+
+static void
+set_gradient_pattern (cairo_t *cr, int x, int y)
+{
+    cairo_pattern_t *pattern;
+
+    pattern =
+	cairo_pattern_create_linear (x, y, x + WIDTH, y + HEIGHT);
+    cairo_pattern_add_color_stop (pattern, 0, 1, 1, 1, 1);
+    cairo_pattern_add_color_stop (pattern, 1, 0, 0, 0.4, 1);
+    cairo_set_pattern (cr, pattern);
+    cairo_set_alpha (cr, 1);
+}
+
+static void
+set_image_pattern (cairo_t *cr, int x, int y)
+{
+    cairo_pattern_t *pattern;
+
+    pattern = cairo_test_create_png_pattern (cr, png_filename);
+    cairo_set_pattern (cr, pattern);
+    cairo_set_alpha (cr, 1);
+}
+
+static void
+set_translucent_image_pattern (cairo_t *cr, int x, int y)
+{
+    cairo_pattern_t *pattern;
+
+    pattern = cairo_test_create_png_pattern (cr, png_filename);
+    cairo_set_pattern (cr, pattern);
+    cairo_set_alpha (cr, 0.5);
+}
+
+static void
+draw_text (cairo_t *cr, int x, int y)
+{
+    cairo_rel_move_to (cr, 0, fontsize);
+    cairo_show_text (cr, "Aa");
+}
+
+static void
+draw_polygon (cairo_t *cr, int x, int y)
+{
+    cairo_new_path (cr);
+    cairo_move_to (cr, x, y);
+    cairo_line_to (cr, x, y + HEIGHT);
+    cairo_line_to (cr, x + WIDTH / 2, y + 3 * HEIGHT / 4);
+    cairo_line_to (cr, x + WIDTH, y + HEIGHT);
+    cairo_line_to (cr, x + WIDTH, y);
+    cairo_line_to (cr, x + WIDTH / 2, y + HEIGHT / 4);
+    cairo_close_path (cr);
+    cairo_fill (cr);
+}
+
+static void (*pattern_funcs[])(cairo_t *cr, int x, int y) = {
+    set_solid_pattern,
+    set_translucent_pattern,
+    set_gradient_pattern,
+    set_image_pattern,
+    set_translucent_image_pattern
+};
+
+static void (*draw_funcs[])(cairo_t *cr, int x, int y) = {
+    draw_text,
+    draw_polygon,
+};
+
+#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
+#define IMAGE_WIDTH (ARRAY_SIZE (pattern_funcs) * (WIDTH + PAD) + PAD)
+#define IMAGE_HEIGHT (ARRAY_SIZE (draw_funcs) * (HEIGHT + PAD) * 2 + PAD)
+
+static cairo_test_t test = {
+    "coverage",
+    "Various coverage test of cairo",
+    IMAGE_WIDTH, IMAGE_HEIGHT
+};
+
+
+static void
+draw (cairo_t *cr, int width, int height)
+{
+    /* TODO: pattern fill, gradient fill, clipping, gradient clipping,
+       path+solid alpha mask clipping */
+
+    int i, j, x, y;
+
+    cairo_select_font (cr, fontname,
+		       CAIRO_FONT_SLANT_NORMAL,
+		       CAIRO_FONT_WEIGHT_BOLD);
+    cairo_scale_font (cr, fontsize);
+
+    for (j = 0; j < ARRAY_SIZE (draw_funcs); j++) {
+	for (i = 0; i < ARRAY_SIZE (pattern_funcs); i++) {
+	    x = i * (WIDTH + PAD) + PAD;
+	    y = j * (HEIGHT + PAD) + PAD;
+	    cairo_move_to (cr, x, y);
+	    pattern_funcs[i] (cr, x, y);
+	    draw_funcs[j] (cr, x, y);
+	}
+    }
+
+    for (j = 0; j < ARRAY_SIZE (draw_funcs); j++) {
+	for (i = 0; i < ARRAY_SIZE (pattern_funcs); i++) {
+	    x = i * (WIDTH + PAD) + PAD;
+	    y = (ARRAY_SIZE (draw_funcs) + j) * (HEIGHT + PAD) + PAD;
+
+	    cairo_save (cr);
+
+	    cairo_new_path (cr);
+	    cairo_arc (cr, x + WIDTH / 2, y + HEIGHT / 2,
+		       WIDTH / 3, 0, 2 * M_PI);
+	    cairo_clip (cr);
+
+	    cairo_move_to (cr, x, y);
+	    pattern_funcs[i] (cr, x, y);
+	    draw_funcs[j] (cr, x, y);
+
+	    cairo_restore (cr);
+
+	}
+    }
+}
+
+int
+main (void)
+{
+    return cairo_test (&test, draw);
+}