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simplify EncodeBlockSingleColor

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This commit is contained in:
Andrew Cassidy 2021-02-27 16:54:06 -08:00
parent ed89203510
commit 9435003553
1 changed files with 11 additions and 30 deletions
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41
src/BC1/BC1Encoder.cpp
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@ -280,32 +280,20 @@ void BC1Encoder::EncodeBlockSingleColor(Color color, BC1Block *dest) const {
bool using_3color = false;
// why is there no subscript operator for shared_ptr<array>
// TODO use endpoint finder below
BC1MatchEntry match_r = _single_match5->at(color.r);
BC1MatchEntry match_g = _single_match6->at(color.g);
BC1MatchEntry match_b = _single_match5->at(color.b);
EncodeResults result;
FindEndpointsSingleColor(result, color, false);
if ((_flags & (Flags::Use3ColorBlocks | Flags::Use3ColorBlocksForBlackPixels)) != Flags::None) {
BC1MatchEntry match_r_half = _single_match5_half->at(color.r);
BC1MatchEntry match_g_half = _single_match6_half->at(color.g);
BC1MatchEntry match_b_half = _single_match5_half->at(color.b);
EncodeResults result_3color;
FindEndpointsSingleColor(result_3color, color, true);
const unsigned err4 = match_r.error + match_g.error + match_b.error;
const unsigned err3 = match_r_half.error + match_g_half.error + match_b_half.error;
if (err3 < err4) {
min16 = Color::Pack565Unscaled(match_r_half.low, match_g_half.low, match_b_half.low);
max16 = Color::Pack565Unscaled(match_r_half.high, match_g_half.high, match_b_half.high);
if (max16 > min16) std::swap(min16, max16);
using_3color = true;
}
if (result_3color.error < result.error) { result = result_3color; }
}
if (!using_3color) {
min16 = Color::Pack565Unscaled(match_r.low, match_g.low, match_b.low);
max16 = Color::Pack565Unscaled(match_r.high, match_g.high, match_b.high);
min16 = result.low.Pack565Unscaled();
max16 = result.high.Pack565Unscaled();
if (result.color_mode == ColorMode::Solid) {
if (min16 == max16) {
// make sure this isnt accidentally a 3-color block
// so make max16 > min16 (l > h)
@ -323,6 +311,8 @@ void BC1Encoder::EncodeBlockSingleColor(Color color, BC1Block *dest) const {
mask = 0xFF; // invert mask to 3333
}
assert(max16 > min16);
} else if (max16 > min16) {
std::swap(min16, max16);
}
dest->SetLowColor(max16);
@ -583,18 +573,9 @@ void BC1Encoder::FindEndpointsSingleColor(EncodeResults &block, Color4x4 &pixels
std::array<Color, 4> colors = _interpolator->InterpolateBC1(block.low, block.high, is_3color);
Vector4Int result_vector = (Vector4Int)colors[2];
auto &match5 = is_3color ? _single_match5_half : _single_match5;
auto &match6 = is_3color ? _single_match6_half : _single_match6;
FindEndpointsSingleColor(block, color, is_3color);
BC1MatchEntry match_r = match5->at(color.r);
BC1MatchEntry match_g = match6->at(color.g);
BC1MatchEntry match_b = match5->at(color.b);
block.color_mode = is_3color ? ColorMode::SolidThreeColor : ColorMode::Solid;
block.error = 0;
block.low = Color(match_r.low, match_g.low, match_b.low);
block.high = Color(match_r.high, match_g.high, match_b.high);
for (unsigned i = 0; i < 16; i++) {
Vector4Int pixel_vector = (Vector4Int)pixels.Get(i);
auto diff = pixel_vector - result_vector;