neatvnc/src/raw-encoding.c

#include "neatvnc.h"
#include "rfb-proto.h"
#include "vec.h"

#include <pixman.h>

int raw_encode_box(struct vec *dst, const struct rfb_pixel_format *dst_fmt,
		   const struct nvnc_fb *fb,
		   const struct rfb_pixel_format *src_fmt,
		   int x_start, int y_start, int stride, int width, int height)
{
	int rc = -1;

	struct rfb_server_fb_rect rect = {
		.encoding = htonl(RFB_ENCODING_RAW),
		.x = htons(x_start),
		.y = htons(y_start),
		.width = htons(width),
		.height = htons(height),
	};

	rc = vec_reserve(dst, width * height * 4 + 256);
	if (rc < 0)
		return -1;

	rc = vec_append(dst, &rect, sizeof(rect));
	if (rc < 0)
		return -1;

	uint32_t* b = fb->addr;

	if (fb->nvnc_modifier & NVNC_MOD_Y_INVERT) {
		for (int y = y_start; y < y_start + height; ++y)
			for (int x = x_start; x < x_start + width; ++x)
				vec_fast_append_32(dst, b[x + (fb->height - y - 1) * stride]);
	} else {
		for (int y = y_start; y < y_start + height; ++y)
			for (int x = x_start; x < x_start + width; ++x)
				vec_fast_append_32(dst, b[x + y * stride]);
	}

	return 0;
}

int raw_encode_frame(struct vec *dst,
		     const struct rfb_pixel_format *dst_fmt,
		     const struct nvnc_fb *src,
		     const struct rfb_pixel_format *src_fmt,
		     struct pixman_region16 *region)
{
	int rc = -1;

	int n_rects = 0;
	struct pixman_box16 *box = pixman_region_rectangles(region, &n_rects);
	if (n_rects > UINT16_MAX) {
		box = pixman_region_extents(region);
		n_rects = 1;
	}

	struct rfb_server_fb_update_msg head = {
		.type = RFB_SERVER_TO_CLIENT_FRAMEBUFFER_UPDATE,
		.n_rects = htons(n_rects),
	};

	rc = vec_append(dst, &head, sizeof(head));
	if (rc < 0)
		return -1;

	for (int i = 0; i < n_rects; ++i) {
		int x = box[i].x1;
		int y = box[i].y1;
		int box_width = box[i].x2 - x;
		int box_height = box[i].y2 - y;

		rc = raw_encode_box(dst, dst_fmt, src, src_fmt, x, y,
				    src->width, box_width, box_height);
		if (rc < 0)
			return -1;
	}

	return 0;
}