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visionmercer
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34777f7c80
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684e3d1b0c
10 changed files with 484 additions and 59 deletions
238
include/bgifnt.bm
Normal file
238
include/bgifnt.bm
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FUNCTION LoadBGIFont (filename AS STRING)
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LoadBGIFont = __BGI_Internal(1, 0, 0, 0, 0, filename, 0)
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END FUNCTION
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SUB UnloadBGIFont (fontHandle AS INTEGER)
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DIM discard AS LONG
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discard = __BGI_Internal(2, fontHandle, 0, 0, 0, "", 0)
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END SUB
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SUB DisplayBGIText (fontHandle AS INTEGER, startX AS SINGLE, startY AS SINGLE, text AS STRING, fontSize AS SINGLE, col AS LONG)
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DIM discard AS LONG
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discard = __BGI_Internal(3, fontHandle, startX, startY, fontSize, text, col)
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END SUB
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FUNCTION __BGI_Internal (mode AS INTEGER, handle AS INTEGER, arg1 AS SINGLE, arg2 AS SINGLE, arg3 AS SINGLE, textData AS STRING, col AS LONG)
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DIM filename AS STRING
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DIM fNum AS INTEGER
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DIM slot AS INTEGER
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DIM i AS LONG
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DIM c AS INTEGER
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DIM d AS STRING
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DIM header_size_pos AS LONG
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DIM header_size AS INTEGER
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DIM stroke_header_start AS LONG
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DIM strokes_offset AS INTEGER
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DIM asc_temp AS INTEGER
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DIM base_temp AS INTEGER
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DIM desc_temp AS INTEGER
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DIM char_offsets_pos AS LONG
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DIM widths_pos AS LONG
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DIM startX AS SINGLE
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DIM startY AS SINGLE
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DIM fontSize AS SINGLE
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DIM text AS STRING
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DIM font_height AS INTEGER
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DIM scale AS SINGLE
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DIM x AS SINGLE
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DIM ch AS INTEGER
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DIM stroke_pos AS LONG
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DIM cur_x AS SINGLE
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DIM cur_y AS SINGLE
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DIM byte1 AS INTEGER
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DIM byte2 AS INTEGER
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DIM op1 AS INTEGER
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DIM op2 AS INTEGER
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DIM m AS INTEGER
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DIM dx_raw AS INTEGER
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DIM dx AS INTEGER
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DIM dy_raw AS INTEGER
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DIM dy AS INTEGER
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DIM new_x AS SINGLE
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DIM new_y AS SINGLE
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STATIC init AS INTEGER
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STATIC __bgi_fontdata() AS STRING
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STATIC __bgi_metrics() AS LONG
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CONST MAX_FONTS = 10
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CONST M_INUSE = 1
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CONST M_FIRSTCHAR = 2
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CONST M_NUMCHARS = 3
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CONST M_ASCENDER = 4
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CONST M_BASELINE = 5
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CONST M_DESCENDER = 6
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CONST M_STROKESSTART = 7
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CONST METRICS_SIZE = 521
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IF NOT init THEN
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REDIM __bgi_fontdata(1 TO MAX_FONTS) AS STRING
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REDIM __bgi_metrics(1 TO MAX_FONTS, 1 TO METRICS_SIZE) AS LONG
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init = -1
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END IF
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SELECT CASE mode
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CASE 1 ' --- LOAD FONT ---
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filename = textData
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IF _FILEEXISTS(filename) = 0 THEN
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PRINT "File not found: "; filename
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__BGI_Internal = 0
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EXIT FUNCTION
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END IF
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slot = 0
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FOR i = 1 TO MAX_FONTS
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IF __bgi_metrics(i, M_INUSE) = 0 THEN
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slot = i
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EXIT FOR
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END IF
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NEXT i
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IF slot = 0 THEN
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PRINT "BGI Font Error: Maximum loaded font limit reached."
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__BGI_Internal = 0
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EXIT FUNCTION
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END IF
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' Extract stream data safely
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fNum = FREEFILE
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OPEN filename FOR BINARY AS #fNum
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__bgi_fontdata(slot) = SPACE$(LOF(fNum))
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GET #fNum, , __bgi_fontdata(slot)
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CLOSE #fNum
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d = __bgi_fontdata(slot)
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' Validate signature header identity
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IF MID$(d, 1, 2) <> "PK" OR ASC(MID$(d, 3, 1)) <> 8 OR ASC(MID$(d, 4, 1)) <> 8 OR MID$(d, 5, 4) <> "BGI " THEN
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PRINT "Not a valid Borland BGI .CHR font file: "; filename
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__bgi_fontdata(slot) = ""
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__BGI_Internal = 0
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EXIT FUNCTION
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END IF
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' Track string end parsing marker
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i = 9
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WHILE i <= LEN(d) AND ASC(MID$(d, i, 1)) <> 26
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i = i + 1
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WEND
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IF i > LEN(d) THEN
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PRINT "Invalid font format: Missing description terminator."
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__bgi_fontdata(slot) = ""
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__BGI_Internal = 0
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EXIT FUNCTION
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END IF
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header_size_pos = i + 1
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header_size = CVI(MID$(d, header_size_pos, 2))
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stroke_header_start = header_size + 1
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IF ASC(MID$(d, stroke_header_start, 1)) <> ASC("+") THEN
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PRINT "Not a stroked font."
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__bgi_fontdata(slot) = ""
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__BGI_Internal = 0
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EXIT FUNCTION
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END IF
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__bgi_metrics(slot, M_NUMCHARS) = CVI(MID$(d, stroke_header_start + 1, 2))
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__bgi_metrics(slot, M_FIRSTCHAR) = ASC(MID$(d, stroke_header_start + 4, 1))
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strokes_offset = CVI(MID$(d, stroke_header_start + 5, 2))
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' Signed Int8 layout mappings
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asc_temp = ASC(MID$(d, stroke_header_start + 8, 1))
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IF asc_temp > 127 THEN __bgi_metrics(slot, M_ASCENDER) = asc_temp - 256 ELSE __bgi_metrics(slot, M_ASCENDER) = asc_temp
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base_temp = ASC(MID$(d, stroke_header_start + 9, 1))
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IF base_temp > 127 THEN __bgi_metrics(slot, M_BASELINE) = base_temp - 256 ELSE __bgi_metrics(slot, M_BASELINE) = base_temp
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desc_temp = ASC(MID$(d, stroke_header_start + 10, 1))
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IF desc_temp > 127 THEN __bgi_metrics(slot, M_DESCENDER) = desc_temp - 256 ELSE __bgi_metrics(slot, M_DESCENDER) = desc_temp
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' Assign vector stroke references
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char_offsets_pos = stroke_header_start + 16
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FOR c = 0 TO __bgi_metrics(slot, M_NUMCHARS) - 1
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__bgi_metrics(slot, 8 + __bgi_metrics(slot, M_FIRSTCHAR) + c) = CVI(MID$(d, char_offsets_pos + c * 2, 2))
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NEXT c
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' Map character layout metrics width boundaries
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widths_pos = char_offsets_pos + __bgi_metrics(slot, M_NUMCHARS) * 2
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FOR c = 0 TO __bgi_metrics(slot, M_NUMCHARS) - 1
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__bgi_metrics(slot, 265 + __bgi_metrics(slot, M_FIRSTCHAR) + c) = ASC(MID$(d, widths_pos + c, 1))
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NEXT c
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__bgi_metrics(slot, M_STROKESSTART) = stroke_header_start + strokes_offset
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__bgi_metrics(slot, M_INUSE) = -1
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__BGI_Internal = slot
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CASE 2 ' --- UNLOAD FONT ---
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IF handle >= 1 AND handle <= MAX_FONTS THEN
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__bgi_metrics(handle, M_INUSE) = 0
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__bgi_fontdata(handle) = ""
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END IF
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CASE 3 ' --- DISPLAY TEXT ---
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IF handle < 1 OR handle > MAX_FONTS THEN EXIT FUNCTION
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IF __bgi_metrics(handle, M_INUSE) = 0 THEN EXIT FUNCTION
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startX = arg1
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startY = arg2
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fontSize = arg3
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text = textData
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font_height = __bgi_metrics(handle, M_ASCENDER) - __bgi_metrics(handle, M_DESCENDER)
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IF font_height = 0 THEN font_height = 1
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scale = fontSize / font_height
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x = startX
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FOR ch = 1 TO LEN(text)
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c = ASC(MID$(text, ch, 1))
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IF c < __bgi_metrics(handle, M_FIRSTCHAR) OR c >= __bgi_metrics(handle, M_FIRSTCHAR) + __bgi_metrics(handle, M_NUMCHARS) OR __bgi_metrics(handle, 8 + c) = 0 THEN
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x = x + 8 * scale
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_CONTINUE
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END IF
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stroke_pos = __bgi_metrics(handle, M_STROKESSTART) + __bgi_metrics(handle, 8 + c)
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cur_x = x
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cur_y = startY
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DO
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byte1 = ASC(MID$(__bgi_fontdata(handle), stroke_pos, 1))
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byte2 = ASC(MID$(__bgi_fontdata(handle), stroke_pos + 1, 1))
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stroke_pos = stroke_pos + 2
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op1 = (byte1 AND 128) \ 128
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op2 = (byte2 AND 128) \ 128
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m = op1 + op1 + op2
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IF m = 0 THEN EXIT DO
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IF m = 1 THEN _CONTINUE
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dx_raw = byte1 AND 127
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dx = dx_raw
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IF dx > 63 THEN dx = dx - 128
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dy_raw = byte2 AND 127
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dy = dy_raw
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IF dy > 63 THEN dy = dy - 128
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dy = -dy
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new_x = x + dx * scale
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new_y = startY + dy * scale
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IF m = 2 THEN
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cur_x = new_x
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cur_y = new_y
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ELSEIF m = 3 THEN
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LINE (cur_x, cur_y)-(new_x, new_y), col
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cur_x = new_x
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cur_y = new_y
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END IF
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LOOP
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x = x + __bgi_metrics(handle, 265 + c) * scale
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NEXT ch
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END SELECT
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END FUNCTION
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