Add pixel swizzler test
diff --git a/test/c/std/wbmp.c b/test/c/std/wbmp.c
index 1678943..f5d9f7c 100644
--- a/test/c/std/wbmp.c
+++ b/test/c/std/wbmp.c
@@ -67,6 +67,174 @@
// No mimic library.
#endif
+// ---------------- Pixel Swizzler Tests
+
+void //
+fill_palette_with_grays(wuffs_base__pixel_buffer* pb) {
+ wuffs_base__slice_u8 palette = wuffs_base__pixel_buffer__palette(pb);
+ if (palette.len != 1024) {
+ return;
+ }
+ int i;
+ for (i = 0; i < 256; i++) {
+ palette.ptr[(4 * i) + 0] = i;
+ palette.ptr[(4 * i) + 1] = i;
+ palette.ptr[(4 * i) + 2] = i;
+ palette.ptr[(4 * i) + 3] = 0xFF;
+ }
+}
+
+void //
+fill_table(wuffs_base__table_u8 t, uint8_t c) {
+ size_t y;
+ for (y = 0; y < t.height; y++) {
+ memset(t.ptr + (y * t.stride), c, t.width);
+ }
+}
+
+const char* //
+test_wuffs_pixel_swizzler_swizzle() {
+ CHECK_FOCUS(__func__);
+
+ const uint32_t width = 5;
+ const uint32_t height = 5;
+ uint8_t dummy_palette_array[1024];
+ wuffs_base__pixel_swizzler swizzler;
+
+ const struct {
+ wuffs_base__color_u32_argb_premul pixel;
+ uint32_t pixfmt_repr;
+ } srcs[] = {
+ {
+ .pixel = 0xFF444444,
+ .pixfmt_repr = WUFFS_BASE__PIXEL_FORMAT__Y,
+ },
+ {
+ .pixel = 0xFF444444,
+ .pixfmt_repr = WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY,
+ },
+ {
+ .pixel = 0xFF443300,
+ .pixfmt_repr = WUFFS_BASE__PIXEL_FORMAT__BGR,
+ },
+ {
+ .pixel = 0x55443300,
+ .pixfmt_repr = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL,
+ },
+ };
+
+ const struct {
+ wuffs_base__color_u32_argb_premul pixel;
+ uint32_t pixfmt_repr;
+ } dsts[] = {
+ {
+ .pixel = 0x80000040,
+ .pixfmt_repr = WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL,
+ },
+ };
+
+ const wuffs_base__pixel_blend blends[] = {
+ WUFFS_BASE__PIXEL_BLEND__SRC,
+ };
+
+ int s;
+ for (s = 0; s < WUFFS_TESTLIB_ARRAY_SIZE(srcs); s++) {
+ // Allocate the src_pixbuf.
+ wuffs_base__pixel_config src_pixcfg = ((wuffs_base__pixel_config){});
+ wuffs_base__pixel_config__set(&src_pixcfg, srcs[s].pixfmt_repr,
+ WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, width,
+ height);
+ wuffs_base__pixel_buffer src_pixbuf = ((wuffs_base__pixel_buffer){});
+ CHECK_STATUS("set_from_slice",
+ wuffs_base__pixel_buffer__set_from_slice(
+ &src_pixbuf, &src_pixcfg, g_src_slice_u8));
+ fill_palette_with_grays(&src_pixbuf);
+
+ // Set the middle src pixel.
+ if (srcs[s].pixfmt_repr == WUFFS_BASE__PIXEL_FORMAT__Y) {
+ fill_table(wuffs_base__pixel_buffer__plane(&src_pixbuf, 0), 0x44);
+ } else if (srcs[s].pixfmt_repr ==
+ WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY) {
+ fill_table(wuffs_base__pixel_buffer__plane(&src_pixbuf, 0), 0x44);
+ } else {
+ CHECK_STATUS("set_color_u32_at",
+ wuffs_base__pixel_buffer__set_color_u32_at(
+ &src_pixbuf, width / 2, height / 2, srcs[s].pixel));
+ }
+
+ // Check the middle src pixel.
+ wuffs_base__color_u32_argb_premul have_src_pixel =
+ wuffs_base__pixel_buffer__color_u32_at(&src_pixbuf, width / 2,
+ height / 2);
+ if (have_src_pixel != srcs[s].pixel) {
+ RETURN_FAIL("s=%d: src_pixel: have 0x%08" PRIX32 ", want 0x%08" PRIX32, s,
+ have_src_pixel, srcs[s].pixel);
+ }
+
+ int d;
+ for (d = 0; d < WUFFS_TESTLIB_ARRAY_SIZE(dsts); d++) {
+ // Allocate the dst_pixbuf.
+ wuffs_base__pixel_config dst_pixcfg = ((wuffs_base__pixel_config){});
+ wuffs_base__pixel_config__set(&dst_pixcfg, dsts[d].pixfmt_repr,
+ WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, width,
+ height);
+ wuffs_base__pixel_buffer dst_pixbuf = ((wuffs_base__pixel_buffer){});
+ CHECK_STATUS("set_from_slice",
+ wuffs_base__pixel_buffer__set_from_slice(
+ &dst_pixbuf, &dst_pixcfg, g_have_slice_u8));
+ fill_palette_with_grays(&dst_pixbuf);
+
+ wuffs_base__slice_u8 dst_palette =
+ wuffs_base__pixel_buffer__palette(&dst_pixbuf);
+ if (dst_palette.len == 0) {
+ dst_palette = wuffs_base__make_slice_u8(
+ &dummy_palette_array[0],
+ WUFFS_TESTLIB_ARRAY_SIZE(dummy_palette_array));
+ }
+
+ int b;
+ for (b = 0; b < WUFFS_TESTLIB_ARRAY_SIZE(blends); b++) {
+ // Set the middle dst pixel.
+ CHECK_STATUS("set_color_u32_at",
+ wuffs_base__pixel_buffer__set_color_u32_at(
+ &dst_pixbuf, width / 2, height / 2, dsts[d].pixel));
+
+ // Swizzle.
+ CHECK_STATUS(
+ "prepare",
+ wuffs_base__pixel_swizzler__prepare(
+ &swizzler, wuffs_base__make_pixel_format(dsts[d].pixfmt_repr),
+ dst_palette, wuffs_base__make_pixel_format(srcs[s].pixfmt_repr),
+ wuffs_base__pixel_buffer__palette(&src_pixbuf), blends[b]));
+ wuffs_base__pixel_swizzler__swizzle_interleaved(
+ &swizzler,
+ wuffs_base__table_u8__row(
+ wuffs_base__pixel_buffer__plane(&dst_pixbuf, 0), height / 2),
+ dst_palette,
+ wuffs_base__table_u8__row(
+ wuffs_base__pixel_buffer__plane(&src_pixbuf, 0), height / 2));
+
+ // Check the middle dst pixel.
+ wuffs_base__color_u32_argb_premul want_dst_pixel = 0;
+ if (blends[b] == WUFFS_BASE__PIXEL_BLEND__SRC) {
+ want_dst_pixel = srcs[s].pixel;
+ } else {
+ return "unsupported blend";
+ }
+ wuffs_base__color_u32_argb_premul have_dst_pixel =
+ wuffs_base__pixel_buffer__color_u32_at(&dst_pixbuf, width / 2,
+ height / 2);
+ if (have_dst_pixel != want_dst_pixel) {
+ RETURN_FAIL("s=%d, d=%d, b=%d: dst_pixel: have 0x%08" PRIX32
+ ", want 0x%08" PRIX32,
+ s, d, b, have_dst_pixel, want_dst_pixel);
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
// ---------------- WBMP Tests
const char* //
@@ -168,6 +336,11 @@
proc g_tests[] = {
+ // These pixel_swizzler tests are really testing the Wuffs base library.
+ // They aren't specific to the std/wbmp code, but putting them here is as
+ // good as any other place.
+ test_wuffs_pixel_swizzler_swizzle,
+
test_wuffs_wbmp_decode_frame_config,
test_wuffs_wbmp_decode_image_config,
test_wuffs_wbmp_decode_interface,
