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adding CI (CommanderX16 Image) file viewer
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Irmen de Jong
parent
7549ddcd2b
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7a7270d769
185
examples/cx16/imgviewer/civiewer.p8
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185
examples/cx16/imgviewer/civiewer.p8
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%target cx16
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%import graphics
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%import textio
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%import diskio
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%import c64colors
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%zeropage basicsafe
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; CommanderX16 Image file format.
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; Numbers are encoded in little endian format (lsb first).
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;
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; offset value
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; -----------------
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; HEADER (12 bytes):
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; 0-1 'CI' in petscii , from "CommanderX16 Image".
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; 2 Size of the header data following this byte (always 9, could become more if format changes)
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; 3-4 Width in pixels (must be multiple of 8)
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; 5-6 Height in pixels
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; 7 Bits-per-pixel (1, 2, 4 or 8) (= 2, 4, 16 or 256 colors)
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; this also determines the number of palette entries following later.
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; 8 Settings bits.
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; bit 0 and 1 = compression. 00 = uncompressed
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; 01 = PCX-RLE [TODO not yet implemented]
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; 10 = LZSA [TODO not yet implemented]
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; 11 = Exomizer [TODO not yet implemented]
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; bit 2 = palette format. 0 = 4 bits/channel (2 bytes per color, $0R $GB) [TODO not yet implemented]
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; 1 = 8 bits/channel (3 bytes per color, $RR $GG $BB)
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; 4 bits per channel is the Cx16's native palette format.
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; bit 3 = bitmap format. 0 = raw bitmap pixels
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; 1 = tile-based image [TODO not yet implemented]
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; bit 4 = hscale (horizontal display resulution) 0 = 320 pixels, 1 = 640 pixels
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; bit 5 = vscale (vertical display resulution) 0 = 240 pixels, 1 = 480 pixels
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; bit 6,7: reserved, set to 0
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; 9-11 Size of the bitmap data following the palette data.
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; This is a 24-bits number, can be 0 ("unknown", in which case just read until the end).
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;
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; PALETTE (always present but size varies):
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; 12-... Color palette. Number of entries = 2 ^ bits-per-pixel. Number of bytes per
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; entry is 2 or 3, depending on the chosen palette format in the setting bits.
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;
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; BITMAPDATA (size varies):
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; After this, the actual image data follows.
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; If the bitmap format is 'raw bitmap pixels', the bimap is simply written as a sequence
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; of bytes making up the image's scan lines. #bytes per scan line = width * bits-per-pixel / 8
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; If it is 'tiles', .... [TODO]
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; If a compression scheme is used, the bitmap data here has to be decompressed first.
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main {
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ubyte[256] buffer
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ubyte[256] buffer2
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ubyte[256] buffer3
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str filename = "trsi256.ci"
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sub start() {
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buffer[0] = 0
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buffer2[0] = 0
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buffer3[0] = 0
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ubyte read_success = false
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if(io.f_open(8, filename)) {
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uword size = io.f_read(buffer, 12) ; read the header
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if size==12 {
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if buffer[0]=='c' and buffer[1]=='i' and buffer[2] == 9 {
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if buffer[11] {
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txt.print("file too large >64kb!\n") ; TODO add support for large files
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} else {
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uword width = mkword(buffer[4], buffer[3])
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uword height = mkword(buffer[6], buffer[5])
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ubyte bpp = buffer[7]
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uword num_colors = 1
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num_colors <<= bpp ; TODO FIX THIS: uword num_colors = 1 << bpp
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ubyte flags = buffer[8]
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ubyte compression = flags & %00000011
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ubyte palette_format = (flags & %00000100) >> 2
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ubyte bitmap_format = (flags & %00001000) >> 3
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ubyte hscale = (flags & %00010000) >> 4
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ubyte vscale = (flags & %00100000) >> 5
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uword bitmap_size = mkword(buffer[10], buffer[9])
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uword palette_size
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if palette_format
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palette_size = 3*num_colors
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else
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palette_size = 2*num_colors
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txt.print(filename)
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txt.print("\ndimensions: ")
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txt.print_uw(width)
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txt.chrout('*')
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txt.print_uw(height)
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txt.print("\nbits-per-pixel: ")
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txt.print_ub(bpp)
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txt.print(" #colors: ")
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txt.print_uw(num_colors)
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txt.print("\ncompression: ")
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txt.print_ub(compression)
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txt.print("\npalette format: ")
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txt.print_ub(palette_format)
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txt.print("\nbitmap format: ")
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txt.print_ub(bitmap_format)
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txt.print("\nscaling: ")
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txt.print_ub(hscale)
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txt.chrout(',')
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txt.print_ub(vscale)
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txt.chrout('\n')
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if compression!=0 {
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txt.print("compression not yet supported\n") ; TODO implement this
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} else if bitmap_format==1 {
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txt.print("tiled bitmap not yet supported\n") ; TODO implement this
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} else {
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txt.print("reading palette and bitmap...\n")
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size = io.f_read(buffer, palette_size)
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if size==palette_size {
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size = io.f_read($3000, bitmap_size)
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read_success = size==bitmap_size
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}
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}
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}
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}
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} else {
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txt.print("io error or invalid image file\n")
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}
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io.f_close()
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if read_success {
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txt.print("done!\n")
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} else {
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txt.print("error loading image file.\n")
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}
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}
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txt.print(diskio.status(8))
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}
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}
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io {
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ubyte iteration_in_progress = false
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sub f_open(ubyte drivenumber, uword filenameptr) -> ubyte {
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f_close()
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c64.SETNAM(strlen(filenameptr), filenameptr)
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c64.SETLFS(11, drivenumber, 0)
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void c64.OPEN() ; open 11,8,0,"filename"
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if_cc {
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iteration_in_progress = true
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void c64.CHKIN(11) ; use #2 as input channel
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if_cc
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return true
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}
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f_close()
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return false
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}
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sub f_read(uword bufferpointer, uword buffersize) -> uword {
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if not iteration_in_progress
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return 0
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uword actual = 0
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repeat buffersize {
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ubyte data = c64.CHRIN()
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@(bufferpointer) = data
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bufferpointer++
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actual++
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ubyte status = c64.READST()
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if status==64
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f_close() ; end of file, close it
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if status
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return actual
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}
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return actual
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}
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sub f_close() {
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; -- end an iterative file loading session (close channels).
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if iteration_in_progress {
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c64.CLRCHN()
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c64.CLOSE(11)
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iteration_in_progress = false
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}
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}
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}
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@ -7,6 +7,16 @@
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main {
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sub start() {
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ubyte error
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error = error and error!=64 ; TODO fix crash (also for other datatypes)
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ubyte bpp = buffer[7]
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uword num_colors = 1 << bpp ; TODO FIX THIS
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ubyte[] barr = [0,0,0]
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uword[] warr = [0,0,0]
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