Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Support for VT100 dot stretching

Browse source
This commit is contained in:
Jeff Parsons 2016-08-08 11:19:06 -07:00
commit f7464dd182
7 changed files with 4890 additions and 4701 deletions
Download patch file Download diff file Expand all files Collapse all files

7
modules/pc8080/lib/video.js
View file

@ -117,6 +117,7 @@ function Video(parmsVideo, canvas, context, textarea, container)
this.cxCellDefault = this.cxCell = parmsVideo['cellWidth'] || 1;
this.cyCellDefault = this.cyCell = parmsVideo['cellHeight'] || 1;
this.abFontData = null;
this.fDotStretcher = false;
this.nBitsPerPixel = parmsVideo['bufferBits'] || 1;
this.iBitFirstPixel = parmsVideo['bufferLeft'] || 0;
@ -495,6 +496,7 @@ Video.prototype.createFonts = function(abFontData)
* We retain abFontData in case we have to rebuild the fonts (eg, when we switch from 80 to 132 columns)
*/
this.abFontData = abFontData;
this.fDotStretcher = (this.nFormat == Video.FORMAT.VT100);
this.aFonts[Video.VT100.FONT.NORML] = [
this.createFontVariation(this.cxCell, this.cyCell),
this.createFontVariation(this.cxCell, this.cyCell, this.fUnderline)
@ -561,6 +563,7 @@ Video.prototype.createFontVariation = function(cxCell, cyCell, fUnderline)
var offFontData = iChar * nFontBytesPerChar + ((nFontByteOffset + y) & (nFontBytesPerChar - 1));
var bits = (fUnderline && y == 8? 0xff : this.abFontData[offFontData]);
for (var nRows = 0; nRows < (cyCell / this.cyCell); nRows++) {
var bitPrev = 0;
for (var x = 0, xDst = x; x < this.cxCell; x++) {
/*
* While x goes from 0 to cxCell-1, obviously we will run out of bits after x is 7;
@ -568,12 +571,14 @@ Video.prototype.createFontVariation = function(cxCell, cyCell, fUnderline)
* (so that line-drawing characters seamlessly connect), we ensure that the effective
* shift count remains stuck at 7 once it reaches 7.
*/
var bit = bits & (0x80 >> (x > 7? 7 : x));
var bitReal = bits & (0x80 >> (x > 7? 7 : x));
var bit = (this.fDotStretcher && !bitReal && bitPrev)? bitPrev : bitReal;
for (var nCols = 0; nCols < (cxCell / this.cxCell); nCols++) {
if (fReverse) bit = !bit;
this.setPixel(imageChar, xDst, yDst, bit? 1 : 0);
xDst++;
}
bitPrev = bitReal;
}
yDst++;
}