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optimize the case of "redraw all the text"

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Jorj Bauer 2017-02-26 14:23:53 -05:00
parent 7a18fe2171
commit ceebb3b1d4
2 changed files with 42 additions and 8 deletions
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48
apple/appledisplay.cpp
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@ -457,6 +457,45 @@ void AppleDisplay::Draw14HiresPixelsAt(uint16_t addr)
}
}
void AppleDisplay::redraw40ColumnText()
{
bool invert;
uint16_t start = ((*switches) & S_PAGE2) ? 0x800 : 0x400;
uint8_t row, col;
col = -1; // will force us to deinterlaceAddress()
// Every time through this loop, we increment the column. That's going to be correct most of the time.
// Sometimes we'll get beyond the end (40 columns), and wind up on another line 8 rows down.
// Sometimes we'll get beyond the end, and we'll wind up in unused RAM.
// But this is an optimization (for speed) over just calling DrawCharacter() for every one.
for (uint16_t addr = start; addr <= start + 0x3FF; addr++,col++) {
if (col > 39 || row > 23) {
// Could be blanking space; we'll try to re-confirm...
deinterlaceAddress(addr, &row, &col);
}
// Only draw onscreen locations
if (col <= 39 && row <= 23) {
const uint8_t *cptr = xlateChar(mmu->read(addr), &invert);
for (uint8_t y2 = 0; y2<8; y2++) {
uint8_t d = *(cptr + y2);
for (uint8_t x2 = 0; x2 < 7; x2++) {
if (d & 1) {
uint8_t val = (invert ? c_black : textColor);
drawPixel(val, col*7+x2, row*8+y2);
} else {
uint8_t val = (invert ? textColor : c_black);
drawPixel(val, col*7+x2, row*8+y2);
}
d >>= 1;
}
}
}
}
}
void AppleDisplay::modeChange()
{
if ((*switches) & S_TEXT) {
@ -470,14 +509,7 @@ void AppleDisplay::modeChange()
}
}
} else {
uint16_t start = ((*switches) & S_PAGE2) ? 0x800 : 0x400;
for (uint16_t addr = start; addr <= start + 0x3FF; addr++) {
uint8_t row, col;
deinterlaceAddress(addr, &row, &col);
if (col <= 39 && row <= 23) {
DrawCharacterAt(mmu->read(addr), col, row);
}
}
redraw40ColumnText();
}
return;

2
apple/appledisplay.h
View File

@ -68,6 +68,8 @@ class AppleDisplay : public VMDisplay{
const unsigned char *xlateChar(uint8_t c, bool *invert);
void redraw40ColumnText();
private:
volatile bool dirty;
AiieRect dirtyRect;