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Fixing crop_dup_borders() so mipmap levels smaller than 4x4 get duplicated edge pixels vs. black pixels (to reduce edge artifacts on tiny mips).

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This commit is contained in:
Rich Geldreich
2019-05-11 21:05:01 -07:00
parent a416f59292
commit b844b9e7ac
1 changed files with 14 additions and 11 deletions
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25
basisu_enc.h
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@@ -1676,22 +1676,25 @@ namespace basisu
image &crop_dup_borders(uint32_t w, uint32_t h)
{
uint32_t orig_w = m_width, orig_h = m_height;
const uint32_t orig_w = m_width, orig_h = m_height;
crop(w, h);
if ((m_width > orig_w) && (orig_w))
if (orig_w && orig_h)
{
for (uint32_t x = orig_w; x < m_width; x++)
for (uint32_t y = 0; y < m_height; y++)
set_clipped(x, y, get_clamped(x, y));
}
if (m_width > orig_w)
{
for (uint32_t x = orig_w; x < m_width; x++)
for (uint32_t y = 0; y < m_height; y++)
set_clipped(x, y, get_clamped(minimum(x, orig_w - 1U), minimum(y, orig_h - 1U)));
}
if ((m_height > orig_h) && (orig_h))
{
for (uint32_t y = orig_h; y < m_height; y++)
for (uint32_t x = 0; x < m_width; x++)
set_clipped(x, y, get_clamped(x, y));
if (m_height > orig_h)
{
for (uint32_t y = orig_h; y < m_height; y++)
for (uint32_t x = 0; x < m_width; x++)
set_clipped(x, y, get_clamped(minimum(x, orig_w - 1U), minimum(y, orig_h - 1U)));
}
}
return *this;
}