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Fix volume icon clipping bugs. Fixes #117
This commit is contained in:
Joshua Bell
parent
262571c104
commit
3787ed24d7
@ -2384,6 +2384,31 @@ LA5CB: pla
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rts
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;;; ============================================================
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;;; This handles drawing volume icons "behind" windows. It is
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;;; done by comparing the bounding rect of the icon (including
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;;; label) with windows, and returning a reduced clipping rect.
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;;; Since the overlap may be concave, multiple calls may be
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;;; necessary; a flag is set if another call is required.
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;;;
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;;; The algorithm is as follows:
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;;;
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;;; * Take the bounding box for the icon+label (bounds_*), and
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;;; use it as an initial clipping rect.
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;;; * Test each corner of the rect.
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;;; * If the corner is inside a window, compute the window bounds.
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;;; (Complicated by title bars, scroll bars, and borders.)
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;;; * Consider each case where a window and rect overlap. There
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;;; are 9 cases (8 interesting, one degenerate).
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;;; * Reduce the clipping rect to the leftmost exposed portion.
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;;; * Recheck the corners, since another window may be overlapped.
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;;; * Once a minimal rect is achieved, set a flag indicating if
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;;; another call is needed, and return.
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;;; * Caller draws the icon into the clipping rect. If flag was
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;;; set, the caller calls in again.
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;;; * On re-entry, return to the initial bounding box but with
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;;; an updated left edge.
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;;;
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;;; ============================================================
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;;; Initial bounds, saved for re-entry.
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bounds_l: .word 0 ; written but never read???
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@ -2401,6 +2426,7 @@ cliprect: DEFINE_RECT 0, 0, 0, 0, cliprect
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.proc set_port_for_vol_icon
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jsr calc_icon_poly
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;; Set up bounds_t
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lda poly::v0::ycoord
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sta bounds_t
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sta portbits::cliprect::y1
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@ -2410,6 +2436,7 @@ cliprect: DEFINE_RECT 0, 0, 0, 0, cliprect
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sta portbits::cliprect::y1+1
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sta portbits::viewloc::ycoord+1
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;; Set up bounds_l
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lda poly::v5::xcoord
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sta bounds_l
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sta portbits::cliprect::x1
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@ -2419,6 +2446,7 @@ cliprect: DEFINE_RECT 0, 0, 0, 0, cliprect
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sta portbits::cliprect::x1+1
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sta portbits::viewloc::xcoord+1
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;; Set up bounds_r/b
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ldx #3
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: lda poly::v4,x
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sta bounds_r,x ; right and bottom
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@ -2445,7 +2473,6 @@ done: MGTK_CALL MGTK::SetPortBits, portbits
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.proc calc_window_intersections
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ptr := $06
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lda #0 ; BUG: immediately overwritten???
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jmp start
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;;; findwindow_params::window_id is used as first part of
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@ -2477,6 +2504,9 @@ pt4: DEFINE_POINT 0,0,pt4
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xcoord: .word 0
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ycoord: .word 0
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stash_r: .word 0
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;; Viewport/Cliprect to adjust
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vx := portbits::viewloc::xcoord
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vy := portbits::viewloc::ycoord
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@ -2558,12 +2588,8 @@ next_pt:
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set_bits:
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MGTK_CALL MGTK::SetPortBits, portbits
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;; if (cr_r < bounds_r) more drawing is needed
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lda cr_r+1
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cmp bounds_r+1
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bne :+
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lda cr_r
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cmp bounds_r
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bcc :+
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cmp16 cr_r, bounds_r
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bmi :+
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copy #0, more_drawing_needed_flag
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rts
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@ -2630,14 +2656,24 @@ do_pt: lda pt_num
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ora scrollbar_flags
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sta scrollbar_flags
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;; TODO: I *think* win_l/t/r/b are supposed to be 1px beyond
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;; window's bounds, but aren't consistently so. ???
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;; 1px implicit left borders, and move 1px beyond bounds ???
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;; win_l -= 2
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;; icon_grafport::cliprect::x1 -= 2
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sub16 win_l, #2, win_l
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sub16 icon_grafport::cliprect::x1, #2, icon_grafport::cliprect::x1
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;; 1px implicit bottom border
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add16 icon_grafport::cliprect::y2, #1, icon_grafport::cliprect::y2
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;; TODO: 1px implicit right border?
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kTitleBarHeight = 14 ; Should be 12? (But no visual bugs)
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kScrollBarWidth = 20
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kScrollBarHeight = 12 ; BUG: Should be 10? (See #117)
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kScrollBarHeight = 10
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;; NOTE: algorithm does not account for 1px implicit border applied to dialogs and windows
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;; --------------------------------------------------
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;; Adjust window rect to account for title bar
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@ -2704,13 +2740,7 @@ check_scrollbars:
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;; Make absolute
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;; win_r += win_l
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lda win_r
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clc
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adc win_l
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sta win_r
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lda win_l+1
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adc win_r+1
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sta win_r+1
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add16 win_r, win_l, win_r
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;; win_b += win_t
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add16 win_b, win_t, win_b
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@ -2737,11 +2767,14 @@ check_scrollbars:
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;; . :::: :::: ::::
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;; . :::: :::: ::::
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copy16 cr_r, stash_r ; in case this turns out to be case 2
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;; Cases 1/2/3 (and continue below)
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;; if (cr_r > win_r)
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;; . cr_r = win_r + 1
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cmp16 cr_r, win_r
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bmi :+
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add16 win_r, #1, cr_r
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jmp vert
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@ -2750,15 +2783,16 @@ check_scrollbars:
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;; . cr_r = win_l
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: cmp16 win_l, cr_l
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bmi vert
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copy16 win_l, cr_r
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jmp reclip
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;; Cases 3/6 (and done)
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;; if (win_t > cr_t)
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;; . cr_b = win_t
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vert: cmp16 win_t, cr_t
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bmi :+
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copy16 win_t, cr_b
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copy #1, more_drawing_needed_flag
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jmp reclip
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@ -2769,9 +2803,10 @@ vert: cmp16 win_t, cr_t
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;; . vy = win_b + 2
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: cmp16 win_b, cr_b
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bpl :+
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lda win_b
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clc
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adc #2
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adc #1
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sta cr_t
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sta vy
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lda win_b+1
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@ -2782,14 +2817,28 @@ vert: cmp16 win_t, cr_t
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jmp reclip
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;; Case 2
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;; cr_l = cr_r
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;; vx = cr_r
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: lda cr_r
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;; if (win_r < stash_r)
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;; . cr_l = win_r + 2
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;; . vx = win_r + 2
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;; . cr_r = stash_r
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: cmp16 win_r, stash_r
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bpl :+
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lda win_r
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clc
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adc #2
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sta cr_l
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sta vx
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lda cr_r+1
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lda win_r+1
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adc #0
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sta cr_l+1
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sta vx+1
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copy16 stash_r, cr_r
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jmp reclip
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;; Case 5 - done!
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: copy16 bounds_r, cr_r
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add16 bounds_r, #1, cr_l
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jmp set_bits
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.endproc
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