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cogl/tests: Avoid floats when converting between int formats

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All we need is an intermediate int format with twice as many bits and
to put division at the end to avoid any loss of precision.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3903>

(cherry picked from commit 3eb32cf750)
This commit is contained in:
Daniel van Vugt 2024-07-25 19:08:11 +08:00 committed by Robert Mader
parent 35c0c245ee
commit 6e12b423c7
1 changed files with 2 additions and 8 deletions
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10
src/tests/cogl/conform/test-offscreen-texture-formats.c
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@ -35,19 +35,13 @@ get_bits (uint32_t in,
static int
rgb16_to_rgb8 (int rgb16)
{
float r;
r = rgb16 / (float) ((1 << 16) - 1);
return (int) (r * (float) ((1 << 8) - 1));
return (int) ((int32_t) rgb16 * 0xff / 0xffff);
}
static int
rgb8_to_rgb16 (int rgb8)
{
float r;
r = rgb8 / (float) ((1 << 8) - 1);
return (int) (r * (float) ((1 << 16) - 1));
return (int) ((int32_t) rgb8 * 0xffff / 0xff);
}
static void