drewcassidy/quicktex
1
0
Fork 0
mirror of https://github.com/drewcassidy/quicktex.git synced 2024-09-13 06:37:34 +00:00
Code Issues Projects Releases Activity

Quick shortcut for all-black blocks since they are very common

Browse Source
This commit is contained in:
Andrew Cassidy 2021-02-27 17:03:19 -08:00
parent 9435003553
commit 193ac22eb5
1 changed files with 38 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
src/BC1/BC1Encoder.cpp
View File

@ -277,42 +277,47 @@ void BC1Encoder::EncodeBlockSingleColor(Color color, BC1Block *dest) const {
uint8_t mask = 0xAA; // 2222
uint16_t min16, max16;
bool using_3color = false;
if ((color.r | color.g | color.g) == 0) {
// quick shortcut for all-black blocks
min16 = 0;
max16 = 1;
mask = 0x55; // 1111 (Min value only, max is ignored)
} else {
// why is there no subscript operator for shared_ptr<array>
EncodeResults result;
FindEndpointsSingleColor(result, color, false);
// why is there no subscript operator for shared_ptr<array>
EncodeResults result;
FindEndpointsSingleColor(result, color, false);
if ((_flags & (Flags::Use3ColorBlocks | Flags::Use3ColorBlocksForBlackPixels)) != Flags::None) {
EncodeResults result_3color;
FindEndpointsSingleColor(result_3color, color, true);
if ((_flags & (Flags::Use3ColorBlocks | Flags::Use3ColorBlocksForBlackPixels)) != Flags::None) {
EncodeResults result_3color;
FindEndpointsSingleColor(result_3color, color, true);
if (result_3color.error < result.error) { result = result_3color; }
}
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)
if (min16 > 0) {
min16--;
mask = 0; // endpoints are equal so mask doesnt matter
} else {
assert(min16 == 0 && max16 == 0);
max16 = 1;
min16 = 0;
mask = 0x55; // 1111 (Min value only, max is ignored)
}
} else if (max16 < min16) {
std::swap(min16, max16);
mask = 0xFF; // invert mask to 3333
if (result_3color.error < result.error) { result = result_3color; }
}
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)
if (min16 > 0) {
min16--;
mask = 0; // endpoints are equal so mask doesnt matter
} else {
assert(min16 == 0 && max16 == 0);
max16 = 1;
min16 = 0;
mask = 0x55; // 1111 (Min value only, max is ignored)
}
} else if (max16 < min16) {
std::swap(min16, max16);
mask = 0xFF; // invert mask to 3333
}
assert(max16 > min16);
} else if (max16 > min16) {
std::swap(min16, max16); // assure 3-color blocks
}
assert(max16 > min16);
} else if (max16 > min16) {
std::swap(min16, max16);
}
dest->SetLowColor(max16);