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Use more efficient means for blank lines.

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This commit is contained in:
Thomas Harte
2025-09-17 22:33:59 -04:00
parent ae774e88fa
commit 3aafba707a
1 changed files with 11 additions and 15 deletions
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26
Machines/Acorn/BBCMicro/BBCMicro.cpp
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@@ -303,7 +303,7 @@ public:
output_mode = OutputMode::Sync;
} else if(is_colour_burst) {
output_mode = OutputMode::ColourBurst;
} else if(is_blank) {
} else if(is_blank || (state.row_address & 8)) {
output_mode = OutputMode::Blank;
} else if(state.display_enable) {
output_mode = OutputMode::Pixels;
@@ -360,19 +360,15 @@ public:
}
// Hard coded from here for Mode 0!
if(state.row_address & 8) {
std::fill(pixel_pointer_, pixel_pointer_+8, 0);
} else {
const auto source = ram_[address];
pixel_pointer_[0] = (source & 0x80) ? 0xff : 0x00;
pixel_pointer_[1] = (source & 0x40) ? 0xff : 0x00;
pixel_pointer_[2] = (source & 0x20) ? 0xff : 0x00;
pixel_pointer_[3] = (source & 0x10) ? 0xff : 0x00;
pixel_pointer_[4] = (source & 0x08) ? 0xff : 0x00;
pixel_pointer_[5] = (source & 0x04) ? 0xff : 0x00;
pixel_pointer_[6] = (source & 0x02) ? 0xff : 0x00;
pixel_pointer_[7] = (source & 0x01) ? 0xff : 0x00;
}
const auto source = ram_[address];
pixel_pointer_[0] = (source & 0x80) ? 0xff : 0x00;
pixel_pointer_[1] = (source & 0x40) ? 0xff : 0x00;
pixel_pointer_[2] = (source & 0x20) ? 0xff : 0x00;
pixel_pointer_[3] = (source & 0x10) ? 0xff : 0x00;
pixel_pointer_[4] = (source & 0x08) ? 0xff : 0x00;
pixel_pointer_[5] = (source & 0x04) ? 0xff : 0x00;
pixel_pointer_[6] = (source & 0x02) ? 0xff : 0x00;
pixel_pointer_[7] = (source & 0x01) ? 0xff : 0x00;
pixel_pointer_ += 8;
pixels_ += 8;
@@ -426,7 +422,7 @@ private:
Outputs::CRT::CRT crt_;
uint8_t *pixel_data_ = nullptr, *pixel_pointer_ = nullptr;
size_t pixels_;
size_t pixels_ = 0;
const uint8_t *const ram_ = nullptr;
SystemVIA &system_via_;