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VT100 supports both 80-column and 132-column modes now

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This commit is contained in:
Jeff Parsons 2016-08-15 12:06:30 -07:00
commit aa08c7a94b
1 changed files with 53 additions and 30 deletions
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83
modules/pc8080/lib/video.js
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@ -152,7 +152,7 @@ function Video(parmsVideo, canvas, context, textarea, container)
/*
* Now that we've finished using nRowsBuffer to help define the screen size, we add one more
* row for text modes, to simplify smooth-scrolling down the road.
* row for text modes, to account for the VT100's scroll line buffer (used for smooth scrolling).
*/
if (this.cyCell > 1) this.nRowsBuffer++;
@ -292,6 +292,9 @@ Video.VT100 = {
/**
* initBuffers()
*
* @this {Video}
* @return {boolean}
*/
Video.prototype.initBuffers = function()
{
@ -308,10 +311,11 @@ Video.prototype.initBuffers = function()
cyBuffer = this.cxBuffer;
}
this.sizeBuffer = ((this.cxBuffer * this.nBitsPerPixel) >> 3) * this.cyBuffer;
this.sizeBuffer = 0;
if (!this.fUseRAM) {
this.sizeBuffer = ((this.cxBuffer * this.nBitsPerPixel) >> 3) * this.cyBuffer;
if (!this.bus.addMemory(this.addrBuffer, this.sizeBuffer, Memory.TYPE.VIDEO)) {
return;
return false;
}
}
@ -319,15 +323,15 @@ Video.prototype.initBuffers = function()
* imageBuffer is only used for graphics modes. For text modes, we create a canvas
* for each font and draw characters by drawing from the font canvas to the target canvas.
*/
if (this.cxCell > 1) {
if (this.sizeBuffer) {
this.imageBuffer = this.contextScreen.createImageData(cxBuffer, cyBuffer);
this.nPixelsPerCell = (16 / this.nBitsPerPixel)|0;
this.initCellCache(this.sizeBuffer >> 1);
} else {
/*
* We add an extra column per row to store the visible line length at the start of every row.
*/
this.initCellCache((this.nColsBuffer + 1) * this.nRowsBuffer);
} else {
this.imageBuffer = this.contextScreen.createImageData(cxBuffer, cyBuffer);
this.nPixelsPerCell = (16 / this.nBitsPerPixel)|0;
this.initCellCache(this.sizeBuffer >> 1);
}
this.canvasBuffer = document.createElement("canvas");
@ -383,6 +387,7 @@ Video.prototype.initBuffers = function()
this.abLineBuffer = new Array(this.nColsBuffer);
}
return true;
};
/**
@ -461,7 +466,8 @@ Video.prototype.doneLoad = function(sURL, sFontData, nErrorCode)
* Minimal font data validation, just to make sure we're not getting garbage from the server.
*/
if (abFontData.length == 2048) {
this.createFonts(abFontData);
this.abFontData = abFontData;
this.createFonts();
}
else {
this.notice("Unrecognized font data length (" + abFontData.length + ")");
@ -484,30 +490,33 @@ Video.prototype.doneLoad = function(sURL, sFontData, nErrorCode)
};
/**
* createFonts(abFontData)
* createFonts()
*
* @this {Video}
* @param {Array.<number>} abFontData
* @return {boolean}
*/
Video.prototype.createFonts = function(abFontData)
Video.prototype.createFonts = function()
{
/*
* 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)
];
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)
];
if (this.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)
];
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)
];
return true;
}
return false;
};
/**
@ -724,6 +733,19 @@ Video.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
Video.prototype.updateDimensions = function(nCols, nRows)
{
this.println("updateDimensions(" + nCols + "," + nRows + ")");
this.nColsBuffer = nCols;
/*
* Even when the number of effective rows is 14 (or 15 counting the scroll line buffer), we want
* to leave the number of rows at 24 (or 25 counting the scroll line buffer), because the VT100 doesn't
* actually change character height (only character width).
*
* this.nRowsBuffer = nRows+1; // +1 for scroll line buffer
*/
this.cxCell = this.cxCellDefault;
if (nCols > 80) this.cxCell--; // VT100 font cells are 9x10 instead of 10x10 in 132-column mode
if (this.initBuffers()) {
this.createFonts();
}
};
/**
@ -1085,8 +1107,8 @@ Video.prototype.updateVT100 = function(fForced)
if (cUpdated && this.contextBuffer) {
/*
* NOTE: We must subtract cyCell from cyBuffer to avoid displaying the extra row that we normally buffer
* in support of smooth-scrolling.
* NOTE: We must subtract cyCell from cyBuffer to avoid displaying the extra "scroll line" that we normally
* buffer to support smooth-scrolling.
*/
this.contextScreen.drawImage(this.canvasBuffer, 0, 0, this.cxBuffer, this.cyBuffer - this.cyCell, this.xScreenOffset, this.yScreenOffset, this.cxScreenOffset, this.cyScreenOffset);
}
@ -1139,9 +1161,10 @@ Video.prototype.updateScreen = function(n)
}
/*
* Since this is not a forced update, if our cell cache is valid AND the buffer is clean, then do nothing.
* Since this is not a forced update, if our cell cache is valid AND we allocated our own buffer AND the buffer
* is clean, then there's nothing to do.
*/
if (fUpdate && this.fCellCacheValid) {
if (fUpdate && this.fCellCacheValid && this.sizeBuffer) {
if ((fClean = this.bus.cleanMemory(this.addrBuffer, this.sizeBuffer))) {
fUpdate = false;
}