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added gfx2.fill() flood fill routine
This commit is contained in:
Irmen de Jong
parent
8bffd7672d
commit
e15bc68c9b
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@ -547,7 +547,7 @@ _done
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}
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}
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sub plot(uword @zp x, uword y, ubyte color) {
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sub plot(uword @zp x, uword @zp y, ubyte @zp color) {
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ubyte[8] @shared bits = [128, 64, 32, 16, 8, 4, 2, 1]
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ubyte[4] @shared mask4c = [%00111111, %11001111, %11110011, %11111100]
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ubyte[4] @shared shift4c = [6,4,2,0]
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@ -750,6 +750,123 @@ _done
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}
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}
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sub fill(word @zp x, word @zp y, ubyte new_color) {
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; Non-recursive scanline flood fill.
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; based loosely on code found here https://www.codeproject.com/Articles/6017/QuickFill-An-efficient-flood-fill-algorithm
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; with the fixes applied to the seedfill_4 routine as mentioned in the comments.
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const ubyte MAXDEPTH = 48
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word[MAXDEPTH] @shared stack_xl
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word[MAXDEPTH] @shared stack_xr
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word[MAXDEPTH] @shared stack_y
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byte[MAXDEPTH] @shared stack_dy
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cx16.r12L = 0 ; stack pointer
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word x1
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word x2
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byte dy
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cx16.r10L = new_color
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sub push_stack(word sxl, word sxr, word sy, byte sdy) {
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if cx16.r12L==MAXDEPTH
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return
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cx16.r0s = sy+sdy
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if cx16.r0s>=0 and cx16.r0s<=height-1 {
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;; stack_xl[cx16.r12L] = sxl
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;; stack_xr[cx16.r12L] = sxr
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;; stack_y[cx16.r12L] = sy
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;; stack_dy[cx16.r12L] = sdy
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;; cx16.r12L++
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%asm {{
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lda cx16.r12L
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asl a
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tay
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lda sxl
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sta stack_xl,y
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lda sxl+1
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sta stack_xl+1,y
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lda sxr
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sta stack_xr,y
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lda sxr+1
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sta stack_xr+1,y
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lda sy
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sta stack_y,y
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lda sy+1
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sta stack_y+1,y
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ldy cx16.r12L
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lda sdy
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sta stack_dy,y
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inc cx16.r12L
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}}
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}
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}
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sub pop_stack() {
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;; cx16.r12L--
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;; x1 = stack_xl[cx16.r12L]
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;; x2 = stack_xr[cx16.r12L]
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;; y = stack_y[cx16.r12L]
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;; dy = stack_dy[cx16.r12L]
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;; y += dy
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%asm {{
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dec cx16.r12L
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lda cx16.r12L
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asl a
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tay
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lda stack_xl,y
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sta x1
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lda stack_xl+1,y
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sta x1+1
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lda stack_xr,y
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sta x2
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lda stack_xr+1,y
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sta x2+1
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lda stack_y,y
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sta y
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lda stack_y+1,y
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sta y+1
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ldy cx16.r12L
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lda stack_dy,y
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sta dy
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}}
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y+=dy
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}
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cx16.r11L = pget(x as uword, y as uword) ; old_color
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if cx16.r11L == cx16.r10L
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return
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if x<0 or x > width-1 or y<0 or y > height-1
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return
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push_stack(x, x, y, 1)
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push_stack(x, x, y + 1, -1)
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word left = 0
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while cx16.r12L {
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pop_stack()
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x = x1
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while x >= 0 and pget(x as uword, y as uword) == cx16.r11L {
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plot(x as uword, y as uword, cx16.r10L)
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x--
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}
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if x>= x1
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goto skip
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left = x + 1
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if left < x1
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push_stack(left, x1 - 1, y, -dy)
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x = x1 + 1
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do {
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while x <= width-1 and pget(x as uword, y as uword) == cx16.r11L {
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plot(x as uword, y as uword, cx16.r10L)
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x++
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}
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push_stack(left, x - 1, y, dy)
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if x > x2 + 1
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push_stack(x2 + 1, x - 1, y, -dy)
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skip:
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x++
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while x <= x2 and pget(x as uword, y as uword) != cx16.r11L
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x++
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left = x
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} until x>x2
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}
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}
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sub position(uword @zp x, uword y) {
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ubyte bank
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when active_mode {
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@ -381,6 +381,7 @@ Full-screen multicolor bitmap graphics routines, available on the Cx16 machine o
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- clearing screen, switching screen mode, also back to text mode is possible.
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- drawing and reading individual pixels
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- drawing lines, rectangles, filled rectangles, circles, discs
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- flood fill
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- drawing text inside the bitmap
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- in monochrome mode, it's possible to use a stippled drawing pattern to simulate a shade of gray.
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@ -14,6 +14,8 @@ For 9.0 major changes
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- DONE: for loops now skip the whole loop if from value already outside the loop range (this is what all other programming languages also do)
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- DONE: asmsub params or return values passed in cpu flags (like carry) now must be declared as booleans (previously ubyte was still accepted).
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- DONE: (on cx16) added diskio.save_raw() to save without the 2 byte prg header
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- DONE: added sys.irqsafe_xxx irqd routines
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- DONE: added gfx2.fill() flood fill routine
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- [much work:] add special (u)word array type (or modifier such as @fast or @split? ) that puts the array into memory as 2 separate byte-arrays 1 for LSB 1 for MSB -> allows for word arrays of length 256 and faster indexing
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this is an enormous amout of work, if this type is to be treated equally as existing (u)word , because all expression / lookup / assignment routines need to know about the distinction....
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@ -61,7 +63,6 @@ Libraries:
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- c64: make the graphics.BITMAP_ADDRESS configurable (VIC banking)
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- optimize several inner loops in gfx2 even further?
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- add modes 3 and perhaps even 2 to gfx2 (lores 16 color and 4 color)?
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- add a flood fill (span fill/scanline fill) routine to gfx2?
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Expressions:
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@ -9,8 +9,10 @@
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main {
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sub start() {
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gfx2.screen_mode(4)
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demofill()
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sys.wait(2*60)
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gfx2.screen_mode(5)
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demo1()
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sys.wait(2*60)
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demo2()
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@ -19,6 +21,19 @@ main {
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txt.print("done!\n")
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}
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sub demofill() {
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gfx2.circle(160, 120, 110, 1)
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gfx2.rect(180, 5, 25, 190, 1)
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gfx2.line(100, 150, 240, 10, 1)
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gfx2.line(101, 150, 241, 10, 1)
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;gfx2.monochrome_stipple(true)
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sys.wait(60)
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gfx2.fill(100,100,2)
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;gfx2.monochrome_stipple(false)
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gfx2.fill(182,140,4)
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}
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sub demo1() {
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uword yy = 10
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uword xx
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