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Fix meaning of 'origin'.

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This commit is contained in:
Thomas Harte 2023-02-25 08:53:00 -06:00
parent 1bdf9a50e6
commit 9debed25e8
1 changed files with 4 additions and 3 deletions
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7
Components/9918/Implementation/Draw.hpp
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@ -137,13 +137,14 @@ void Base<personality>::draw_sprites(LineBuffer &buffer, int start, int end, int
for(int previous_index = index - 1; previous_index >= min_sprite; --previous_index) {
// Determine region of overlap (if any).
LineBuffer::ActiveSprite &previous = buffer.active_sprites[previous_index];
const int origin = previous.x - sprite.x;
const int x1 = std::max(0, 0 - origin);
const int origin = sprite.x - previous.x;
const int x1 = std::max(0, -origin);
const int x2 = std::min(pixel_width - origin, pixel_width);
// Composite sprites.
for(int x = x1; x < x2; x++) {
Storage<personality>::sprite_cache_[previous_index][x + origin] |= Storage<personality>::sprite_cache_[index][x];
Storage<personality>::sprite_cache_[previous_index][x + origin]
|= Storage<personality>::sprite_cache_[index][x];
}
// If a previous opaque sprite has been found, stop.