libliftoff/layer.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "private.h"

struct liftoff_layer *liftoff_layer_create(struct liftoff_output *output)
{
	struct liftoff_layer *layer;

	layer = calloc(1, sizeof(*layer));
	if (layer == NULL) {
		return NULL;
	}
	layer->output = output;
	liftoff_list_insert(output->layers.prev, &layer->link);
	return layer;
}

void liftoff_layer_destroy(struct liftoff_layer *layer)
{
	free(layer->props);
	liftoff_list_remove(&layer->link);
	free(layer);
}

struct liftoff_layer_property *layer_get_property(struct liftoff_layer *layer,
						  const char *name)
{
	size_t i;

	for (i = 0; i < layer->props_len; i++) {
		if (strcmp(layer->props[i].name, name) == 0) {
			return &layer->props[i];
		}
	}
	return NULL;
}

void liftoff_layer_set_property(struct liftoff_layer *layer, const char *name,
				uint64_t value)
{
	struct liftoff_layer_property *props;
	struct liftoff_layer_property *prop;

	/* TODO: better error handling */
	if (strcmp(name, "CRTC_ID") == 0) {
		fprintf(stderr, "refusing to set a layer's CRTC_ID\n");
		return;
	}

	prop = layer_get_property(layer, name);
	if (prop == NULL) {
		props = realloc(layer->props, (layer->props_len + 1)
				* sizeof(struct liftoff_layer_property));
		if (props == NULL) {
			perror("realloc");
			return;
		}
		layer->props = props;
		layer->props_len++;

		prop = &layer->props[layer->props_len - 1];
		memset(prop, 0, sizeof(*prop));
		strncpy(prop->name, name, sizeof(prop->name) - 1);
	}

	prop->value = value;
}

uint32_t liftoff_layer_get_plane_id(struct liftoff_layer *layer)
{
	if (layer->plane == NULL) {
		return 0;
	}
	return layer->plane->id;
}

void layer_get_rect(struct liftoff_layer *layer, struct liftoff_rect *rect)
{
	struct liftoff_layer_property *x_prop, *y_prop, *w_prop, *h_prop;

	x_prop = layer_get_property(layer, "CRTC_X");
	y_prop = layer_get_property(layer, "CRTC_Y");
	w_prop = layer_get_property(layer, "CRTC_W");
	h_prop = layer_get_property(layer, "CRTC_H");

	rect->x = x_prop != NULL ? x_prop->value : 0;
	rect->y = y_prop != NULL ? y_prop->value : 0;
	rect->width = w_prop != NULL ? w_prop->value : 0;
	rect->height = h_prop != NULL ? h_prop->value : 0;
}

bool layer_intersects(struct liftoff_layer *a, struct liftoff_layer *b)
{
	struct liftoff_rect ra, rb;

	layer_get_rect(a, &ra);
	layer_get_rect(b, &rb);

	return ra.x < rb.x + rb.width && ra.y < rb.y + rb.height &&
	       ra.x + ra.width > rb.x && ra.y + ra.height > rb.y;
}