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44 lines
1.7 KiB
C++
44 lines
1.7 KiB
C++
/* Python-rgbcx Texture Compression Library
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Copyright (C) 2021 Andrew Cassidy <drewcassidy@me.com>
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Partially derived from rgbcx.h written by Richard Geldreich 2020 <richgel99@gmail.com>
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and licenced under the public domain
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "BC1Decoder.h"
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namespace rgbcx {
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void BC1Decoder::DecodeBlock(Color4x4 *dest, BC1Block *const block) const {
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const unsigned l = block->GetLowColor();
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const unsigned h = block->GetHighColor();
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const auto selectors = block->UnpackSelectors();
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const auto colors = _interpolator.InterpolateBC1(l, h);
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for (int y = 0; y < 4; y++) {
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for (int x = 0; x < 4; x++) {
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const auto selector = selectors[y][x];
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const auto color = colors[selector];
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assert(selector < 4);
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assert((color.a == 0 && selector == 3 && l <= h) || color.a == UINT8_MAX);
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if (_write_alpha) {
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(*dest)[y][x].Set(color);
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} else {
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(*dest)[y][x].SetRGB(color);
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}
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}
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}
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}
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} // namespace rgbcx
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