shithub: libgraphics

ref: 8aa0dc8601656db1390617d24bc77be17f099686
dir: /viewport.c/

#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <memdraw.h>
#include <geometry.h>
#include "libobj/obj.h"
#include "graphics.h"
#include "internal.h"

static void
viewport_draw(Viewport *v, Image *dst)
{
	Point scale;

	scale.x = Dx(dst->r)/Dx(v->r);
	scale.y = Dy(dst->r)/Dy(v->r);

	/* no downsampling support yet */
	assert(scale.x > 0 && scale.y > 0);

	if(scale.x > 1 || scale.y > 1)
		v->fbctl->upscaledraw(v->fbctl, dst, scale);
	else
		v->fbctl->draw(v->fbctl, dst);
}

static void
viewport_memdraw(Viewport *v, Memimage *dst)
{
	Point scale;

	scale.x = Dx(dst->r)/Dx(v->r);
	scale.y = Dy(dst->r)/Dy(v->r);

	/* no downsampling support yet */
	assert(scale.x > 0 && scale.y > 0);

	if(scale.x > 1 || scale.y > 1)
		v->fbctl->upscalememdraw(v->fbctl, dst, scale);
	else
		v->fbctl->memdraw(v->fbctl, dst);
}

static Framebuf *
viewport_getfb(Viewport *v)
{
	return v->fbctl->getfb(v->fbctl);
}

Viewport *
mkviewport(Rectangle r)
{
	Viewport *v;

	v = emalloc(sizeof *v);
	v->p = Pt2(0,0,1);
	v->bx = Vec2(1,0);
	v->by = Vec2(0,1);
	v->fbctl = mkfbctl(r);
	v->r = r;
	v->draw = viewport_draw;
	v->memdraw = viewport_memdraw;
	v->getfb = viewport_getfb;
	return v;
}

void
rmviewport(Viewport *v)
{
	if(v == nil)
		return;
	rmfbctl(v->fbctl);
	free(v);
}