From 47d68dae59e82c07a2a2ee9175a7d19d99a0592e Mon Sep 17 00:00:00 2001 From: Pekka Paalanen Date: Mon, 23 May 2016 17:42:27 +0300 Subject: [PATCH] tests: rewrite check_surfaces_*() API check_surfaces_geometry() is removed as it was not used by anything, and unlikely would be. check_surfaces_equal() is merged into check_surfaces_match_in_clip(), passing a NULL clip means to compare whole images. check_surfaces_match_in_clip() is converted to work on pixman_image_t instead of struct surface. The function is only concerned about comparing images in memory, and does not care about a wl_buffer or a wl_surface. The verbosity of image comparisons is greatly reduced. An image mismatch no longer prints a flood of raw pixel values. This will be replaced later with a function writing out an error image instead. Degenerate comparisons are no longer accepted, be that clip outside images or zero area. Those are an indication of a programmer error. The pixel format assumptions are made more visible in the code. A new internal helper image_check_get_roi() computes and verifies the area to be compared. Image iterator helper makes it simpler to write manual pixel-poking loops. Signed-off-by: Pekka Paalanen Reviewed-by: Daniel Stone --- tests/internal-screenshot-test.c | 12 +-- tests/weston-test-client-helper.c | 177 +++++++++++++++++++++----------------- tests/weston-test-client-helper.h | 9 +- 3 files changed, 107 insertions(+), 91 deletions(-) diff --git a/tests/internal-screenshot-test.c b/tests/internal-screenshot-test.c index 53e7515..ce41181 100644 --- a/tests/internal-screenshot-test.c +++ b/tests/internal-screenshot-test.c @@ -120,16 +120,17 @@ TEST(internal_screenshot) reference_bad = load_surface_from_png(fname); assert(reference_bad); - /* Test check_surfaces_equal() + /* Test check_images_match() without a clip. * We expect this to fail since we use a bad reference image */ - match = check_surfaces_equal(screenshot, reference_bad); + match = check_images_match(screenshot->buffer->image, + reference_bad->buffer->image, NULL); printf("Screenshot %s reference image\n", match? "equal to" : "different from"); assert(!match); buffer_destroy(reference_bad->buffer); free(reference_bad); - /* Test check_surfaces_match_in_clip() + /* Test check_images_match() with clip. * Alpha-blending and other effects can cause irrelevant discrepancies, so look only * at a small portion of the solid-colored background */ @@ -138,8 +139,9 @@ TEST(internal_screenshot) clip.width = 100; clip.height = 100; printf("Clip: %d,%d %d x %d\n", clip.x, clip.y, clip.width, clip.height); - match = check_surfaces_match_in_clip(screenshot, reference_good, - &clip); + match = check_images_match(screenshot->buffer->image, + reference_good->buffer->image, + &clip); printf("Screenshot %s reference image in clipped area\n", match? "matches" : "doesn't match"); buffer_destroy(reference_good->buffer); free(reference_good); diff --git a/tests/weston-test-client-helper.c b/tests/weston-test-client-helper.c index 76b5cdd..53b8d80 100644 --- a/tests/weston-test-client-helper.c +++ b/tests/weston-test-client-helper.c @@ -968,106 +968,125 @@ screenshot_reference_filename(const char *basename, uint32_t seq) } /** - * check_surfaces_geometry() - verifies two surfaces are same size + * Compute the ROI for image comparisons * - * @returns true if surfaces have the same width and height, or false - * if not, or if there is no actual data. + * \param img_a An image. + * \param img_b Another image. + * \param clip_rect Explicit ROI, or NULL for using the whole + * image area. + * + * \return The region of interest (ROI) that is guaranteed to be inside both + * images. + * + * If clip_rect is given, it must fall inside of both images. + * If clip_rect is NULL, the images must be of the same size. + * If any precondition is violated, this function aborts with an error. + * + * The ROI is given as pixman_box32_t, where x2,y2 are non-inclusive. */ -bool -check_surfaces_geometry(const struct surface *a, const struct surface *b) +static pixman_box32_t +image_check_get_roi(pixman_image_t *img_a, pixman_image_t *img_b, + const struct rectangle *clip_rect) { - if (a == NULL || b == NULL) { - printf("Undefined surfaces\n"); - return false; - } - else if (a->buffer == NULL || b->buffer == NULL) { - printf("Undefined data\n"); - return false; + int width_a; + int width_b; + int height_a; + int height_b; + pixman_box32_t box; + + width_a = pixman_image_get_width(img_a); + height_a = pixman_image_get_height(img_a); + + width_b = pixman_image_get_width(img_b); + height_b = pixman_image_get_height(img_b); + + if (clip_rect) { + box.x1 = clip_rect->x; + box.y1 = clip_rect->y; + box.x2 = clip_rect->x + clip_rect->width; + box.y2 = clip_rect->y + clip_rect->height; + } else { + box.x1 = 0; + box.y1 = 0; + box.x2 = max(width_a, width_b); + box.y2 = max(height_a, height_b); } - else if (a->width != b->width || a->height != b->height) { - printf("Mismatched dimensions: %d,%d != %d,%d\n", - a->width, a->height, b->width, b->height); - return false; - } - return true; + + assert(box.x1 >= 0); + assert(box.y1 >= 0); + assert(box.x2 > box.x1); + assert(box.y2 > box.y1); + assert(box.x2 <= width_a); + assert(box.x2 <= width_b); + assert(box.y2 <= height_a); + assert(box.y2 <= height_b); + + return box; } -/** - * check_surfaces_equal() - tests if two surfaces are pixel-identical - * - * Returns true if surface buffers have all the same byte values, - * false if the surfaces don't match or can't be compared due to - * different dimensions. - */ -bool -check_surfaces_equal(const struct surface *a, const struct surface *b) +struct image_iterator { + char *data; + int stride; /* bytes */ +}; + +static void +image_iter_init(struct image_iterator *it, pixman_image_t *image) { - int bpp = 4; /* Assumes ARGB */ - void *data_a; - void *data_b; + pixman_format_code_t fmt; - if (!check_surfaces_geometry(a, b)) - return false; + it->stride = pixman_image_get_stride(image); + it->data = (void *)pixman_image_get_data(image); - data_a = pixman_image_get_data(a->buffer->image); - data_b = pixman_image_get_data(b->buffer->image); + fmt = pixman_image_get_format(image); + assert(PIXMAN_FORMAT_BPP(fmt) == 32); +} - return (memcmp(data_a, data_b, bpp * a->width * a->height) == 0); +static uint32_t * +image_iter_get_row(struct image_iterator *it, int y) +{ + return (uint32_t *)(it->data + y * it->stride); } /** - * check_surfaces_match_in_clip() - tests if a given region within two - * surfaces are pixel-identical. + * Test if a given region within two images are pixel-identical. + * + * Returns true if the two images pixel-wise identical, and false otherwise. * - * Returns true if the two surfaces have the same byte values within the - * given clipping region, or false if they don't match or the surfaces - * can't be compared. + * \param img_a First image. + * \param img_b Second image. + * \param clip_rect The region of interest, or NULL for comparing the whole + * images. + * + * This function hard-fails if clip_rect is not inside both images. If clip_rect + * is given, the images do not have to match in size, otherwise size mismatch + * will be a hard failure. */ bool -check_surfaces_match_in_clip(const struct surface *a, const struct surface *b, const struct rectangle *clip_rect) +check_images_match(pixman_image_t *img_a, pixman_image_t *img_b, + const struct rectangle *clip_rect) { - int i, j; - int x0, y0, x1, y1; - void *p, *q; - int bpp = 4; /* Assumes ARGB */ - void *data_a; - void *data_b; - - if (!check_surfaces_geometry(a, b) || clip_rect == NULL) - return false; + struct image_iterator it_a; + struct image_iterator it_b; + pixman_box32_t box; + int x, y; + uint32_t *pix_a; + uint32_t *pix_b; - if (clip_rect->x > a->width || clip_rect->y > a->height) { - printf("Clip outside image boundaries\n"); - return true; - } + box = image_check_get_roi(img_a, img_b, clip_rect); - x0 = max(0, clip_rect->x); - y0 = max(0, clip_rect->y); - x1 = min(a->width, clip_rect->x + clip_rect->width); - y1 = min(a->height, clip_rect->y + clip_rect->height); + image_iter_init(&it_a, img_a); + image_iter_init(&it_b, img_b); - if (x0 == x1 || y0 == y1) { - printf("Degenerate comparison\n"); - return true; - } + for (y = box.y1; y < box.y2; y++) { + pix_a = image_iter_get_row(&it_a, y) + box.x1; + pix_b = image_iter_get_row(&it_b, y) + box.x1; + + for (x = box.x1; x < box.x2; x++) { + if (*pix_a != *pix_b) + return false; - data_a = pixman_image_get_data(a->buffer->image); - data_b = pixman_image_get_data(b->buffer->image); - - printf("Bytewise comparison inside clip\n"); - for (i=y0; iwidth * bpp + x0 * bpp; - q = data_b + i * b->width * bpp + x0 * bpp; - if (memcmp(p, q, (x1-x0)*bpp) != 0) { - /* Dump the bad row */ - printf("Mismatched image on row %d\n", i); - for (j=0; j<(x1-x0)*bpp; j++) { - char a_char = *((char*)(p+j*bpp)); - char b_char = *((char*)(q+j*bpp)); - printf("%d,%d: %8x %8x %s\n", i, j, a_char, b_char, - (a_char != b_char)? " <---": ""); - } - return false; + pix_a++; + pix_b++; } } diff --git a/tests/weston-test-client-helper.h b/tests/weston-test-client-helper.h index 3e1cfcd..4910136 100644 --- a/tests/weston-test-client-helper.h +++ b/tests/weston-test-client-helper.h @@ -198,13 +198,8 @@ char * screenshot_reference_filename(const char *basename, uint32_t seq); bool -check_surfaces_geometry(const struct surface *a, const struct surface *b); - -bool -check_surfaces_equal(const struct surface *a, const struct surface *b); - -bool -check_surfaces_match_in_clip(const struct surface *a, const struct surface *b, const struct rectangle *clip); +check_images_match(pixman_image_t *img_a, pixman_image_t *img_b, + const struct rectangle *clip); bool write_surface_as_png(const struct surface *weston_surface, const char *fname); -- 2.7.4