mirror of
https://github.com/irmen/prog8.git
synced 2024-09-07 19:54:26 +00:00
126 lines
4.0 KiB
Lua
126 lines
4.0 KiB
Lua
%target cx16
|
|
%import graphics
|
|
%import diskio
|
|
|
|
bmp_module {
|
|
|
|
sub show_image(uword filenameptr) -> ubyte {
|
|
ubyte load_ok = false
|
|
ubyte[$36] header
|
|
uword size
|
|
uword width
|
|
uword height
|
|
ubyte bpp
|
|
uword offsetx
|
|
uword offsety
|
|
ubyte[256] palette0
|
|
ubyte[256] palette1
|
|
ubyte[256] palette2
|
|
ubyte[256] palette3
|
|
uword total_read = 0
|
|
|
|
palette0[0] = 0
|
|
palette1[0] = 0
|
|
palette2[0] = 0
|
|
palette3[0] = 0
|
|
|
|
if diskio.f_open(8, filenameptr) {
|
|
size = diskio.f_read(header, $36)
|
|
if size==$36 {
|
|
total_read = $36
|
|
if header[0]=='b' and header[1]=='m' {
|
|
uword bm_data_offset = mkword(header[11], header[10])
|
|
uword header_size = mkword(header[$f], header[$e])
|
|
width = mkword(header[$13], header[$12])
|
|
height = mkword(header[$17], header[$16])
|
|
bpp = header[$1c]
|
|
uword num_colors = header[$2e]
|
|
if num_colors == 0
|
|
num_colors = 2**bpp
|
|
uword skip_hdr = header_size - 40
|
|
repeat skip_hdr
|
|
void c64.CHRIN()
|
|
total_read += skip_hdr
|
|
size = diskio.f_read(&palette0, num_colors*4)
|
|
if size==num_colors*4 {
|
|
total_read += size
|
|
repeat bm_data_offset - total_read
|
|
void c64.CHRIN()
|
|
graphics.clear_screen(1, 0)
|
|
palette.set_bgra(&palette0, num_colors)
|
|
decode_bitmap()
|
|
load_ok = true
|
|
}
|
|
}
|
|
}
|
|
|
|
diskio.f_close()
|
|
}
|
|
|
|
return load_ok
|
|
|
|
sub start_plot() {
|
|
offsetx = 0
|
|
offsety = 0
|
|
if width < graphics.WIDTH
|
|
offsetx = (graphics.WIDTH - width - 1) / 2
|
|
if height < graphics.HEIGHT
|
|
offsety = (graphics.HEIGHT - height - 1) / 2
|
|
if width > graphics.WIDTH
|
|
width = graphics.WIDTH
|
|
if height > graphics.HEIGHT-1
|
|
height = graphics.HEIGHT-1
|
|
}
|
|
|
|
sub set_cursor(uword x, uword y) {
|
|
cx16.r0=offsetx+x
|
|
cx16.r1=offsety+y
|
|
cx16.FB_cursor_position()
|
|
}
|
|
|
|
sub decode_bitmap() {
|
|
start_plot()
|
|
uword bits_width = width * bpp
|
|
ubyte pad_bytes = (((bits_width + 31) >> 5) << 2) - ((bits_width + 7) >> 3) as ubyte
|
|
|
|
uword x
|
|
uword y
|
|
ubyte b
|
|
for y in height-1 downto 0 {
|
|
set_cursor(0, y)
|
|
when bpp {
|
|
8 -> {
|
|
for x in 0 to width-1
|
|
cx16.FB_set_pixel(c64.CHRIN())
|
|
}
|
|
4 -> {
|
|
for x in 0 to width-1 step 2 {
|
|
b = c64.CHRIN()
|
|
cx16.FB_set_pixel(b>>4)
|
|
cx16.FB_set_pixel(b&15)
|
|
}
|
|
}
|
|
2 -> {
|
|
for x in 0 to width-1 step 4 {
|
|
b = c64.CHRIN()
|
|
cx16.FB_set_pixel(b>>6)
|
|
cx16.FB_set_pixel(b>>4 & 3)
|
|
cx16.FB_set_pixel(b>>2 & 3)
|
|
cx16.FB_set_pixel(b & 3)
|
|
}
|
|
}
|
|
1 -> {
|
|
for x in 0 to width-1 step 8 {
|
|
cx16.r0 = c64.CHRIN()
|
|
cx16.FB_set_8_pixels_opaque(255, 255, 0)
|
|
}
|
|
}
|
|
}
|
|
|
|
repeat pad_bytes
|
|
void c64.CHRIN()
|
|
}
|
|
}
|
|
}
|
|
}
|