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Limit to eight pixels per fetch, to produce stable video.

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This commit is contained in:
Thomas Harte 2023-12-06 09:13:47 -05:00
parent e43f960934
commit 24eaf95e9d
1 changed files with 3 additions and 4 deletions
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7
Machines/PCCompatible/CGA.hpp
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@ -179,7 +179,7 @@ class CGA {
if(((attributes & 7) == 1) && state.row_address == 13) { if(((attributes & 7) == 1) && state.row_address == 13) {
// Draw as underline. // Draw as underline.
std::fill(pixel_pointer, pixel_pointer + 9, intensity); std::fill(pixel_pointer, pixel_pointer + 8, intensity);
} else { } else {
// Draw according to ROM contents, possibly duplicating final column. // Draw according to ROM contents, possibly duplicating final column.
pixel_pointer[0] = (row & 0x80) ? intensity : off; pixel_pointer[0] = (row & 0x80) ? intensity : off;
@ -190,15 +190,14 @@ class CGA {
pixel_pointer[5] = (row & 0x04) ? intensity : off; pixel_pointer[5] = (row & 0x04) ? intensity : off;
pixel_pointer[6] = (row & 0x02) ? intensity : off; pixel_pointer[6] = (row & 0x02) ? intensity : off;
pixel_pointer[7] = (row & 0x01) ? intensity : off; pixel_pointer[7] = (row & 0x01) ? intensity : off;
pixel_pointer[8] = (glyph >= 0xc0 && glyph < 0xe0) ? pixel_pointer[7] : blank;
} }
} }
pixel_pointer += 9; pixel_pointer += 8;
} }
} }
// Advance. // Advance.
count += 9; count += 8;
// Output pixel row prematurely if storage is exhausted. // Output pixel row prematurely if storage is exhausted.
if(output_state == OutputState::Pixels && pixel_pointer == pixels + DefaultAllocationSize) { if(output_state == OutputState::Pixels && pixel_pointer == pixels + DefaultAllocationSize) {