mothra: fast (offscreen) alpha drawing on scroll
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74cdf2c10a
commit
da8dd94a7a
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@ -151,17 +151,27 @@ int pl_rtfmt(Rtext *t, int wid){
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}
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return p.y;
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}
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/*
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* If we draw the text in a backup bitmap and copy it onto the screen,
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* the bitmap pointers in all the subpanels point to the wrong bitmap.
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* This code fixes them.
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*/
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void pl_stuffbitmap(Panel *p, Image *b){
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p->b=b;
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for(p=p->child;p;p=p->next)
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pl_stuffbitmap(p, b);
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}
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void pl_rtdraw(Image *b, Rectangle r, Rtext *t, int yoffs){
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Point offs, lp;
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Rectangle dr;
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Rectangle cr;
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Rectangle xr;
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Image *bb;
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bb = b;
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if((b = allocimage(display, r, bb->chan, 0, DNofill)) == nil)
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b = bb;
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xr=r;
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cr=b->clipr;
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if(!rectclip(&xr, cr))
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return;
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replclipr(b, b->repl, xr);
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pl_clr(b, r);
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lp=ZP;
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offs=subpt(r.min, Pt(0, yoffs));
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@ -176,6 +186,9 @@ void pl_rtdraw(Image *b, Rectangle r, Rtext *t, int yoffs){
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else if(t->p){
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plmove(t->p, subpt(dr.min, t->p->r.min));
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pldraw(t->p, b);
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if(b != bb)
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pl_stuffbitmap(t->p, bb);
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}
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else{
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string(b, dr.min, display->black, ZP, t->font, t->text);
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@ -195,7 +208,11 @@ void pl_rtdraw(Image *b, Rectangle r, Rtext *t, int yoffs){
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pl_highlight(b, dr);
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}
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}
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replclipr(b, b->repl, cr);
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if(b != bb){
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draw(bb, r, b, 0, b->r.min);
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freeimage(b);
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}
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}
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/*
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* Reposition text already drawn in the window.
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@ -24,21 +24,6 @@ struct Textview{
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int buttons;
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};
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void pl_stuffbitmap(Panel *p, Image *b){
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p->b=b;
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for(p=p->child;p;p=p->next)
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pl_stuffbitmap(p, b);
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}
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/*
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* If we draw the text in a backup bitmap and copy it onto the screen,
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* the bitmap pointers in all the subpanels point to the wrong bitmap.
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* This code fixes them.
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*/
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void pl_drawnon(Rtext *rp, Image *b){
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for(;rp!=0;rp=rp->next)
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if(rp->b==0 && rp->p!=0)
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pl_stuffbitmap(rp->p, b);
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}
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void pl_setscrpos(Panel *p, Textview *tp, Rectangle r){
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Panel *sb;
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int lo, hi;
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@ -51,11 +36,8 @@ void pl_drawtextview(Panel *p){
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int twid;
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Rectangle r;
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Textview *tp;
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Image *b;
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tp=p->data;
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b=allocimage(display, p->r, screen->chan, 0, DNofill);
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if(b==0) b=p->b;
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r=pl_outline(b, p->r, UP);
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r=pl_outline(p->b, p->r, UP);
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twid=r.max.x-r.min.x;
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if(twid!=tp->twid){
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tp->twid=twid;
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@ -63,12 +45,7 @@ void pl_drawtextview(Panel *p){
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p->scr.size.y=tp->thgt;
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}
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p->scr.pos.y=tp->yoffs;
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pl_rtdraw(b, r, tp->text, tp->yoffs);
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if(b!=p->b){
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draw(p->b, p->r, b, 0, b->r.min);
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freeimage(b);
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pl_drawnon(tp->text, p->b);
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}
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pl_rtdraw(p->b, r, tp->text, tp->yoffs);
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pl_setscrpos(p, tp, r);
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}
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/*
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