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Test the RGB565 reader in both byte orders through get_pixel() and a chroma keyed draw

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J. Nick Koston
2026-10-13 21:57:50 -10:00
parent 86bf291cbb
commit 62031f595f
1 changed files with 36 additions and 0 deletions
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tests/components/image/test_image_draw.cpp
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@@ -163,6 +163,42 @@ static void expect_fallback_decodes(bool big_endian) {
TEST(ImageDraw, FallbackDecodesLittleEndian) { expect_fallback_decodes(false); }
TEST(ImageDraw, FallbackDecodesBigEndian) { expect_fallback_decodes(true); }
// The per pixel reader behind get_pixel() and the transparent draws must read
// RGB565 in the byte order the image declares.
static void expect_reader_decodes(bool big_endian) {
const auto data = make_data(2);
Image image(data.data(), W, H, IMAGE_TYPE_RGB565, TRANSPARENCY_OPAQUE, big_endian);
for (int y = 0; y < H; y++) {
for (int x = 0; x < W; x++) {
const uint32_t rgb565 =
display::ColorUtil::read_packed<display::COLOR_BITNESS_565>(data.data(), x + y * W, big_endian);
const Color expected(((rgb565 >> 11) << 3) | ((rgb565 >> 11) >> 2),
(((rgb565 >> 5) & 0x3F) << 2) | (((rgb565 >> 5) & 0x3F) >> 4),
((rgb565 & 0x1F) << 3) | ((rgb565 & 0x1F) >> 2), 0xFF);
EXPECT_EQ(image.get_pixel(x, y).raw_32, expected.raw_32) << "at " << x << "," << y;
}
}
}
TEST(ImageDraw, ReaderDecodesLittleEndian) { expect_reader_decodes(false); }
TEST(ImageDraw, ReaderDecodesBigEndian) { expect_reader_decodes(true); }
// A chroma keyed RGB565 image stays per pixel, so its draw goes through the
// same reader; every drawn pixel must match get_pixel() in both byte orders.
static void expect_keyed_draw_matches_reader(bool big_endian) {
const auto data = make_data(2);
Image image(data.data(), W, H, IMAGE_TYPE_RGB565, TRANSPARENCY_CHROMA_KEY, big_endian);
FallbackDisplay display;
image.draw(0, 0, &display, Color::WHITE, Color::BLACK);
ASSERT_GT(display.pixels.size(), 0u);
for (const auto &pixel : display.pixels) {
EXPECT_EQ(pixel.raw, image.get_pixel(pixel.x, pixel.y).raw_32) << "at " << pixel.x << "," << pixel.y;
}
}
TEST(ImageDraw, KeyedDrawMatchesReaderLittleEndian) { expect_keyed_draw_matches_reader(false); }
TEST(ImageDraw, KeyedDrawMatchesReaderBigEndian) { expect_keyed_draw_matches_reader(true); }
// An RGB image through the fallback must give every pixel the colour get_pixel() reads,
// which keeps red and blue in the order the image stores them.
TEST(ImageDraw, FallbackKeepsRgbChannelOrder) {