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Fix alpha channel checking in RGBGFX test driver

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Compare CGB colors only, including ignoring RGB components if alpha says
the color is transparent
This commit is contained in:
ISSOtm
2022-04-24 17:32:40 +02:00
committed by Eldred Habert
parent 57ac07b03e
commit 82012f698e
1 changed files with 15 additions and 11 deletions
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26
test/gfx/rgbgfx_test.cpp
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@@ -359,17 +359,21 @@ int main(int argc, char **argv) {
Rgba px0 = image0.pixel(x, y);
Rgba px1 = image1.pixel(x, y);
#define compare(WHAT, NAME) \
if (px0.WHAT >> 3 != px1.WHAT >> 3) { \
error(NAME " component at (%" PRIu32 ", %" PRIu32 \
") does not match (source = %u, result = %u)", \
x, y, px0.WHAT >> 3, px1.WHAT >> 3); \
}
compare(red, "Red");
compare(green, "Green");
compare(blue, "Blue");
compare(alpha, "Alpha");
#undef compare
auto cgbColor = [](Rgba const &rgba) {
auto field = [](uint16_t component, uint8_t shift) {
return (component & 0x1F) << shift;
};
return rgba.isTransparent()
? Rgba::transparent
: field(rgba.red, 0) | field(rgba.green, 5) | field(rgba.blue, 10);
};
if (cgbColor(px0) != cgbColor(px1)) {
error("Color mismatch at (%" PRIu32 ", %" PRIu32
"): (%u,%u,%u,%u) became (%u,%u,%u,%u) after round-tripping",
x, y, px0.red, px0.green, px0.blue, px0.alpha, px1.red, px1.green, px1.blue,
px1.alpha);
}
}
}