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Ensured no attempt to write to pixel storage if none was available.

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This commit is contained in:
Thomas Harte 2016-10-19 21:17:27 -04:00
parent 4258401384
commit 734b575d30
1 changed files with 12 additions and 9 deletions
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7
Machines/Oric/Video.cpp
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@ -104,6 +104,8 @@ void VideoOutput::run_for_cycles(int number_of_cycles)
if(_blink_text) inverse_mask ^= (_frame_counter&32) ? 0x77 : 0x00; if(_blink_text) inverse_mask ^= (_frame_counter&32) ? 0x77 : 0x00;
if((control_byte & 0x7f) >= 32) if((control_byte & 0x7f) >= 32)
{
if(_pixel_target)
{ {
uint8_t colours[2] = { uint8_t colours[2] = {
(uint8_t)(_paper ^ inverse_mask), (uint8_t)(_paper ^ inverse_mask),
@ -114,6 +116,7 @@ void VideoOutput::run_for_cycles(int number_of_cycles)
_pixel_target[1] = (colours[(pixels >> 2)&1] & 0x0f) | (colours[(pixels >> 3)&1] & 0xf0); _pixel_target[1] = (colours[(pixels >> 2)&1] & 0x0f) | (colours[(pixels >> 3)&1] & 0xf0);
_pixel_target[2] = (colours[(pixels >> 0)&1] & 0x0f) | (colours[(pixels >> 1)&1] & 0xf0); _pixel_target[2] = (colours[(pixels >> 0)&1] & 0x0f) | (colours[(pixels >> 1)&1] & 0xf0);
} }
}
else else
{ {
switch(control_byte & 0x7f) switch(control_byte & 0x7f)
@ -152,9 +155,9 @@ void VideoOutput::run_for_cycles(int number_of_cycles)
default: break; default: break;
} }
_pixel_target[0] = _pixel_target[1] = _pixel_target[2] = (uint8_t)(_paper ^ inverse_mask); if(_pixel_target) _pixel_target[0] = _pixel_target[1] = _pixel_target[2] = (uint8_t)(_paper ^ inverse_mask);
} }
_pixel_target += 3; if(_pixel_target) _pixel_target += 3;
} }
} }
} }