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gdk: Make gdk_memory_depth_merge() use a table

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This makes it clearer how depths are merged.

Also use the actual desired merge modes, the previous code had some
weird behaviors.
This commit is contained in:
Benjamin Otte 2024-06-29 02:31:56 +02:00
parent 8d5325b816
commit 9abc83fdad
1 changed files with 11 additions and 27 deletions
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38
gdk/gdkmemoryformat.c
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@ -1536,35 +1536,19 @@ GdkMemoryDepth
gdk_memory_depth_merge (GdkMemoryDepth depth1,
GdkMemoryDepth depth2)
{
switch (depth1)
{
case GDK_MEMORY_U8:
if (depth2 == GDK_MEMORY_U8_SRGB)
return GDK_MEMORY_FLOAT16;
else
return depth2;
static const GdkMemoryDepth merged_depths[GDK_N_DEPTHS][GDK_N_DEPTHS] = {
/* U8 U8_SRGB U16 FLOAT16 FLOAT32 */
[GDK_MEMORY_U8] = { GDK_MEMORY_U8, GDK_MEMORY_FLOAT16, GDK_MEMORY_U16, GDK_MEMORY_FLOAT16, GDK_MEMORY_FLOAT32 },
[GDK_MEMORY_U8_SRGB] = { GDK_MEMORY_FLOAT16, GDK_MEMORY_U8_SRGB, GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT16, GDK_MEMORY_FLOAT32 },
[GDK_MEMORY_U16] = { GDK_MEMORY_U16, GDK_MEMORY_FLOAT32, GDK_MEMORY_U16, GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT32 },
[GDK_MEMORY_FLOAT16] = { GDK_MEMORY_FLOAT16, GDK_MEMORY_FLOAT16, GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT16, GDK_MEMORY_FLOAT32 },
[GDK_MEMORY_FLOAT32] = { GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT32, GDK_MEMORY_FLOAT32 },
};
case GDK_MEMORY_U8_SRGB:
if (depth2 == GDK_MEMORY_U8)
return GDK_MEMORY_FLOAT16;
else
return depth2;
g_assert (depth1 < GDK_N_DEPTHS);
g_assert (depth2 < GDK_N_DEPTHS);
case GDK_MEMORY_FLOAT32:
return GDK_MEMORY_FLOAT32;
case GDK_MEMORY_U16:
case GDK_MEMORY_FLOAT16:
if (depth2 == depth1 || depth2 == GDK_MEMORY_U8)
return depth1;
else
return GDK_MEMORY_FLOAT32;
case GDK_N_DEPTHS:
default:
g_assert_not_reached ();
return GDK_MEMORY_U8;
}
return merged_depths[depth1][depth2];
}
/*