[_CD6_]<peach>6.0>PeachTest>PDTextBitmapImpl.mesa!1

PDTextBitmapImpl.mesa

Michael Plass, September 26, 1984 5:33:47 pm PDT

DIRECTORY Environment, PDInterpBitmap, PDInterpSysCalls, PDTextBitmap, Stream, PDStrikeFormat, PDRemoteStream, Inline, String;

PDTextBitmapImpl: PROGRAM

IMPORTS PDInterpBitmap, PDInterpSysCalls, PDRemoteStream, Stream, Inline, String

EXPORTS PDTextBitmap = BEGIN

fontName: PUBLIC LONG STRING ← [120];

bc: CHAR = ' ;

ec: CHAR = '~;

charBitmap: ARRAY CHAR[bc..ec] OF PDInterpBitmap.BitmapDesc;

charWidth: ARRAY CHAR[bc..ec] OF INTEGER;

fontAscent: INTEGER ← 0;

fontDescent: INTEGER ← 0;

ksFontBuffer: LONG POINTER ← NIL;

bytesPerWord: NAT = Environment.bytesPerWord;

nilBitmap: PDInterpBitmap.BitmapDesc = [

sOrigin: 0,

fOrigin: 0,

sMin: 0,

fMin: 0,

sSize: 0,

fSize: 0,

pointer: NIL,

rast: 0,

lines: 0

];

BadFont: ERROR = CODE;

SetFont: PUBLIC PROC [fontFileName: LONG STRING, userName, password: LONG STRING] RETURNS [ok: BOOLEAN ← FALSE] = {

cr: LONG STRING ← [40];

nameCopy: LONG STRING ← [120];

NameCopy: PROC RETURNS [LONG STRING] = {

String.Copy[nameCopy, fontFileName];

RETURN [nameCopy]

};

bytes: INT ← PDRemoteStream.Lookup[NameCopy[], cr, userName, password];

newBuffer: LONG POINTER ← NIL;

bytesRead: INT ← 0;

readFile: PROC[stream: Stream.Handle] = {

bytesRead ← Stream.GetBlock[stream, [blockPointer: newBuffer, startIndex: 0, stopIndexPlusOne: bytes]].bytesTransferred;

};

IF ksFontBuffer # NIL THEN {

FOR c: CHAR IN [bc..ec] DO charBitmap[c] ← nilBitmap; charWidth[c] ← 0 ENDLOOP;

PDInterpSysCalls.FreeSpace[ksFontBuffer];

fontAscent ← fontDescent ← 0;

ksFontBuffer ← NIL

};

fontName.length ← 0;

newBuffer ← PDInterpSysCalls.AllocateSpace[(bytes+bytesPerWord-1)/bytesPerWord];

PDRemoteStream.Read[fontFileName, userName, password, readFile];

IF bytesRead # bytes THEN {

PDInterpSysCalls.FreeSpace[newBuffer];

RETURN [FALSE]

};

ok ← TRUE;

ParseFont[fontFileName, newBuffer, bytes

! BadFont => {ok ← FALSE; CONTINUE};

];

IF ok THEN {

ksFontBuffer ← newBuffer;

}

ELSE {

FOR c: CHAR IN [bc..ec] DO charBitmap[c] ← nilBitmap; charWidth[c] ← 0 ENDLOOP;

PDInterpSysCalls.FreeSpace[newBuffer];

fontAscent ← fontDescent ← 0;

String.Copy[to: fontName, from: fontFileName];

};

ParseFont: PUBLIC PROC [fontFileName: LONG STRING, buffer: LONG POINTER, bytes: INT] = {

wordIndex: INT ← 0;

ReadBlock: PROC [dest: LONG POINTER, words: CARDINAL, wordOffset: INT ← -1] = {

IF wordOffset >= 0 THEN wordIndex ← wordOffset;

Inline.LongCOPY[from: buffer+wordIndex, nwords: words, to: dest];

wordIndex ← wordIndex + words;

};

strike: PDInterpBitmap.BitmapDesc ← nilBitmap;

defaultCharBitmap: PDInterpBitmap.BitmapDesc ← nilBitmap;

defaultCharWidth: INTEGER ← 0;

header: PDStrikeFormat.Header;

ReadBlock[@header, SIZE[PDStrikeFormat.Header], 0];

IF header.format.oneBit # T THEN ERROR BadFont;

IF header.format.index # F THEN ERROR BadFont;

IF header.format.unused # 0 THEN ERROR BadFont;

IF header.format.kerned = T THEN {

boundingBox: PDStrikeFormat.BoundingBox;

body: PDStrikeFormat.Body;

xInSegment, prevXInSegment: CARDINAL;

xInSegmentOffset: INT;

widthEntryOffset: INT;

widthEntry: PDStrikeFormat.WidthEntry;

bodyOffset: INT;

ReadBlock[@boundingBox, SIZE[PDStrikeFormat.BoundingBox]];

bodyOffset ← wordIndex;

ReadBlock[@body, SIZE[PDStrikeFormat.Body]];

fontAscent ← body.ascent;

fontDescent ← body.descent;

strike ← [

sOrigin: -body.ascent,

fOrigin: 0,

sMin: 0,

fMin: 0,

sSize: body.ascent+body.descent,

fSize: body.raster*Environment.bitsPerWord,

pointer: buffer+wordIndex,

rast: body.raster,

lines: body.ascent+body.descent

];

wordIndex ← wordIndex + strike.rast*strike.lines;

widthEntryOffset ← wordIndex+(header.max-header.min+3)*SIZE[CARDINAL];

IF widthEntryOffset # bodyOffset + body.length THEN ERROR BadFont;

ReadBlock[@prevXInSegment, SIZE[CARDINAL]];

xInSegmentOffset ← wordIndex;

FOR char: CHAR IN [header.min..header.max] DO

charPixels: PDInterpBitmap.BitmapDesc ← strike;

ReadBlock[@xInSegment, SIZE[CARDINAL], xInSegmentOffset];

xInSegmentOffset ← xInSegmentOffset + SIZE[CARDINAL];

ReadBlock[@widthEntry, SIZE[PDStrikeFormat.WidthEntry], widthEntryOffset];

widthEntryOffset ← widthEntryOffset + SIZE[PDStrikeFormat.WidthEntry];

IF widthEntry # PDStrikeFormat.nullWidthEntry THEN {

IF widthEntry.width > header.maxwidth THEN ERROR BadFont;

charPixels.fOrigin ← widthEntry.offset+boundingBox.fbbox-prevXInSegment;

charPixels.fMin ← prevXInSegment;

charPixels.fSize ← xInSegment-prevXInSegment;

IF char IN [bc..ec] THEN {

charBitmap[char] ← charPixels;

charWidth[char] ← widthEntry.width;

};

prevXInSegment ← xInSegment;

ENDLOOP;

ReadBlock[@xInSegment, SIZE[CARDINAL], xInSegmentOffset];

xInSegmentOffset ← xInSegmentOffset + SIZE[CARDINAL];

ReadBlock[@widthEntry, SIZE[PDStrikeFormat.WidthEntry], widthEntryOffset];

widthEntryOffset ← widthEntryOffset + SIZE[PDStrikeFormat.WidthEntry];

IF widthEntry # PDStrikeFormat.nullWidthEntry THEN {

strike.fOrigin ← widthEntry.offset+boundingBox.fbbox-prevXInSegment;

strike.fMin ← prevXInSegment;

strike.fSize ← xInSegment-prevXInSegment;

defaultCharBitmap ← strike;

defaultCharWidth ← widthEntry.width;

}

ELSE ERROR BadFont;

}

ELSE ERROR BadFont;

FOR char: CHAR IN [bc..ec] DO

IF charBitmap[char].pointer = NIL THEN {

charBitmap[char] ← defaultCharBitmap;

charWidth[char] ← defaultCharWidth;

};

ENDLOOP;

IF wordIndex*bytesPerWord # bytes THEN ERROR BadFont;

};

FontAscent: PUBLIC PROC RETURNS [INTEGER] = {RETURN [fontAscent]};

FontDescent: PUBLIC PROC RETURNS [INTEGER] = {RETURN [fontDescent]};

TextWidth: PUBLIC PROC [string: LONG STRING, start: NAT ← 0, length: NAT ← NAT.LAST] RETURNS [textWidth: INTEGER] = {

textWidth ← 0;

FOR i: NAT IN [start..start+length) DO

IF i >= string.length THEN EXIT

ELSE {

char: CHAR ← string[i];

IF char IN [bc..ec] THEN textWidth ← textWidth + charWidth[char];

};

ENDLOOP;

};

TextToBitmap: PUBLIC PROC [dest: PDInterpBitmap.BitmapDesc, string: LONG STRING, start: NAT ← 0, length: NAT ← NAT.LAST, function: PDInterpBitmap.Function] = {

w: INTEGER ← 0;

FOR i: NAT IN [start..start+length) DO

IF i >= string.length THEN EXIT

ELSE {

char: CHAR ← string[i];

IF char IN [bc..ec] THEN {

bitmap: PDInterpBitmap.BitmapDesc ← charBitmap[char];

bitmap.fOrigin ← bitmap.fOrigin + w;

PDInterpBitmap.Transfer[dest, bitmap, function];

w ← w + charWidth[char];

};

ENDLOOP;

};

END.