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Added support for VT100 reverse video

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This commit is contained in:
Jeff Parsons 2016-08-01 17:53:41 -07:00 • committed by Jeff Parsons
commit cec09c16e9
3 changed files with 286 additions and 265 deletions
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41
modules/pc8080/lib/video.js
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@ -365,6 +365,12 @@ Video.prototype.initBuffers = function()
* builds a contiguous screen of test data starting at the default frame buffer address (0x2000).
*/
this.rateMonitor = 60;
/*
* The default character-selectable attribute (reverse video vs. underline) is controlled by fUnderline.
*/
this.fUnderline = false;
this.abLineBuffer = new Array(this.nColsBuffer);
}
};
@ -480,31 +486,37 @@ 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.aFonts[Video.VT100.FONT.NORML] = this.createFontVariation(this.cxCell, this.cyCell);
this.aFonts[Video.VT100.FONT.DWIDE] = this.createFontVariation(this.cxCell*2, this.cyCell);
this.aFonts[Video.VT100.FONT.DHIGH] = this.aFonts[Video.VT100.FONT.DHIGH_BOT] = this.createFontVariation(this.cxCell*2, this.cyCell*2);
this.aFonts[Video.VT100.FONT.NORML] = [
this.createFontVariation(this.cxCell, this.cyCell),
this.createFontVariation(this.cxCell, this.cyCell, this.fUnderline)
];
this.aFonts[Video.VT100.FONT.DWIDE] = [
this.createFontVariation(this.cxCell*2, this.cyCell),
this.createFontVariation(this.cxCell*2, this.cyCell, this.fUnderline)
];
this.aFonts[Video.VT100.FONT.DHIGH] = this.aFonts[Video.VT100.FONT.DHIGH_BOT] = [
this.createFontVariation(this.cxCell*2, this.cyCell*2),
this.createFontVariation(this.cxCell*2, this.cyCell*2, this.fUnderline)
];
};
/**
* createFontVariation(cxCell, cyCell, rgbOn, fReverse, fUnderline)
* createFontVariation(cxCell, cyCell, fUnderline)
*
* This creates a 16x16 character grid for the requested font variation. Variations include:
*
* 1) no variation (cell size is this.cxCell x this.cyCell)
* 2) double-wide characters (cell size is this.cxCell*2 x this.cyCell)
* 3) double-high double-wide characters (cell size is this.cxCell*2 x this.cyCell*2)
* 4) variations 1-3 with reverse video enabled
* 5) variations 1-3 with underlining enabled
* 4) all of the above with either reverse video or underline enabled (default is reverse video)
*
* @this {Video}
* @param {number} cxCell is the target width of each character in the grid
* @param {number} cyCell is the target height of each character in the grid
* @param {Array} [rgbOn] contains the RGB values for the font (default is white)
* @param {boolean} [fReverse]
* @param {boolean} [fUnderline]
* @return {Object}
*/
Video.prototype.createFontVariation = function(cxCell, cyCell, rgbOn, fReverse, fUnderline)
Video.prototype.createFontVariation = function(cxCell, cyCell, fUnderline)
{
/*
* On a VT100, cxCell,cyCell is initially 10,10, but may change to 9,10 for 132-column mode.
@ -521,6 +533,12 @@ Video.prototype.createFontVariation = function(cxCell, cyCell, rgbOn, fReverse,
var nFontByteOffset = nFontBytesPerChar > 8? 15 : 0;
var nChars = this.abFontData.length / nFontBytesPerChar;
/*
* The absence of a boolean for fUnderline means that both fReverse and fUnderline are "falsey". The presence
* of a boolean means that fReverse will be true OR fUnderline will be true, but NOT both.
*/
var fReverse = (fUnderline === false);
var font = {cxCell: cxCell, cyCell: cyCell};
font.canvas = document.createElement("canvas");
font.canvas.width = cxCell * 16;
@ -543,6 +561,7 @@ Video.prototype.createFontVariation = function(cxCell, cyCell, rgbOn, fReverse,
*/
var bit = bits & (0x80 >> (x > 7? 7 : x));
for (var nCols = 0; nCols < (cxCell / this.cxCell); nCols++) {
if (fReverse) bit = !bit;
this.setPixel(imageChar, xDst, yDst, bit? 1 : 0);
xDst++;
}
@ -880,7 +899,7 @@ Video.prototype.setPixel = function(image, x, y, bPixel)
Video.prototype.updateChar = function(idFont, col, row, data, context)
{
var bChar = data & 0x7f;
var font = this.aFonts[idFont];
var font = this.aFonts[idFont][(data & 0x80)? 1 : 0];
if (!font) return;
var xSrc = (bChar & 0xf) * font.cxCell;
@ -996,7 +1015,7 @@ Video.prototype.updateVT100 = function()
* TODO: If bit 8 is set, we must select a different font variation, depending on which per-character
* screen attribute is currently enabled (ie, reverse video or underline).
*/
this.updateChar(font, iCol, nRows, data & 0x7f, this.contextBuffer);
this.updateChar(font, iCol, nRows, data, this.contextBuffer);
cUpdated++;
}
iCell++;