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This commit is contained in:
Irmen de Jong 2020-12-06 18:38:27 +01:00
parent c09b8af491
commit 0bf6d2f72c
1 changed files with 4 additions and 7 deletions
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11
examples/cx16/imgviewer/koalaviewer.p8
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@ -6,7 +6,6 @@
main {
const uword load_location = $4000
ubyte screen_color
sub start() {
@ -65,9 +64,7 @@ main {
ubyte @zp cx
uword @zp cy_times_forty = 0
ubyte @zp d
uword bitmap = load_location
screen_color = @(load_location + 8000 + 1000 + 1000) & 15
uword bitmap_ptr = load_location
; theoretically you could put the 8-pixel array in zeropage to squeeze out another tiny bit of performance
ubyte[8] pixels
@ -88,7 +85,7 @@ main {
}
sub get_8_pixels() {
ubyte bm = @(bitmap)
ubyte bm = @(bitmap_ptr)
ubyte @zp m = mcol(bm)
pixels[7] = m
pixels[6] = m
@ -104,12 +101,12 @@ main {
m = mcol(bm)
pixels[1] = m
pixels[0] = m
bitmap++
bitmap_ptr++
sub mcol(ubyte b) -> ubyte {
ubyte @zp color
when b & 3 {
0 -> color = screen_color
0 -> color = @(load_location + 8000 + 1000 + 1000) & 15
1 -> color = @(load_location + 8000 + cy_times_forty + cx) >>4
2 -> color = @(load_location + 8000 + cy_times_forty + cx) & 15
else -> color = @(load_location + 8000 + 1000 + cy_times_forty + cx) & 15