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-rw-r--r--pixman/test/utils.c54
-rw-r--r--pixman/test/utils.h5
2 files changed, 59 insertions, 0 deletions
diff --git a/pixman/test/utils.c b/pixman/test/utils.c
index 66c8dcb89..08eaabbf6 100644
--- a/pixman/test/utils.c
+++ b/pixman/test/utils.c
@@ -548,6 +548,60 @@ write_png (pixman_image_t *image, const char *filename)
#endif
+static void
+color8_to_color16 (uint32_t color8, pixman_color_t *color16)
+{
+ color16->alpha = ((color8 & 0xff000000) >> 24);
+ color16->red = ((color8 & 0x00ff0000) >> 16);
+ color16->green = ((color8 & 0x0000ff00) >> 8);
+ color16->blue = ((color8 & 0x000000ff) >> 0);
+
+ color16->alpha |= color16->alpha << 8;
+ color16->red |= color16->red << 8;
+ color16->blue |= color16->blue << 8;
+ color16->green |= color16->green << 8;
+}
+
+void
+draw_checkerboard (pixman_image_t *image,
+ int check_size,
+ uint32_t color1, uint32_t color2)
+{
+ pixman_color_t check1, check2;
+ pixman_image_t *c1, *c2;
+ int n_checks_x, n_checks_y;
+ int i, j;
+
+ color8_to_color16 (color1, &check1);
+ color8_to_color16 (color2, &check2);
+
+ c1 = pixman_image_create_solid_fill (&check1);
+ c2 = pixman_image_create_solid_fill (&check2);
+
+ n_checks_x = (
+ pixman_image_get_width (image) + check_size - 1) / check_size;
+ n_checks_y = (
+ pixman_image_get_height (image) + check_size - 1) / check_size;
+
+ for (j = 0; j < n_checks_y; j++)
+ {
+ for (i = 0; i < n_checks_x; i++)
+ {
+ pixman_image_t *src;
+
+ if (((i ^ j) & 1))
+ src = c1;
+ else
+ src = c2;
+
+ pixman_image_composite32 (PIXMAN_OP_SRC, src, NULL, image,
+ 0, 0, 0, 0,
+ i * check_size, j * check_size,
+ check_size, check_size);
+ }
+ }
+}
+
/*
* A function, which can be used as a core part of the test programs,
* intended to detect various problems with the help of fuzzing input
diff --git a/pixman/test/utils.h b/pixman/test/utils.h
index 78cf0d16d..45b457ead 100644
--- a/pixman/test/utils.h
+++ b/pixman/test/utils.h
@@ -124,6 +124,11 @@ a8r8g8b8_to_rgba_np (uint32_t *dst, uint32_t *src, int n_pixels);
pixman_bool_t
write_png (pixman_image_t *image, const char *filename);
+void
+draw_checkerboard (pixman_image_t *image,
+ int check_size,
+ uint32_t color1, uint32_t color2);
+
/* A pair of macros which can help to detect corruption of
* floating point registers after a function call. This may
* happen if _mm_empty() call is forgotten in MMX/SSE2 fast