Add a simple drawing example

examples/draw.c

@@ -0,0 +1,79 @@
+#include "neatvnc.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <uv.h>
+#include <assert.h>
+#include <pixman.h>
+#include <libdrm/drm_fourcc.h>
+
+struct draw {
+	struct nvnc_fb fb;
+};
+
+void on_fb_req(struct nvnc *nvnc, bool incremental, uint16_t x, uint16_t y,
+	       uint16_t width, uint16_t height)
+{
+	if (incremental)
+		return;
+
+	struct draw *draw = nvnc_get_userdata(nvnc);
+	assert(draw);
+
+	struct pixman_region16 region;
+	pixman_region_init_rect(&region, 0, 0, draw->fb.width,
+				draw->fb.height);
+	nvnc_update_fb(nvnc, &draw->fb, &region);
+	pixman_region_fini(&region);
+}
+
+void on_pointer_event(struct nvnc *nvnc, uint16_t x, uint16_t y,
+		      enum nvnc_button_mask buttons)
+{
+	if (!(buttons & NVNC_BUTTON_LEFT))
+		return;
+
+	struct draw *draw = nvnc_get_userdata(nvnc);
+	assert(draw);
+
+	uint32_t *image = draw->fb.addr;
+
+	image[x + y * draw->fb.width] = 0;
+
+	struct pixman_region16 region;
+	pixman_region_init_rect(&region, 0, 0, draw->fb.width,
+				draw->fb.height);
+//	pixman_region_init_rect(&region, x, y, 1, 1);
+	nvnc_update_fb(nvnc, &draw->fb, &region);
+	pixman_region_fini(&region);
+}
+
+int main(int argc, char *argv[])
+{
+	struct draw draw; 
+
+	draw.fb.width = 500;
+	draw.fb.height = 500;
+	draw.fb.size = draw.fb.width * draw.fb.height * 4;
+	draw.fb.fourcc_format = DRM_FORMAT_RGBX8888;
+	draw.fb.fourcc_modifier = DRM_FORMAT_MOD_LINEAR;
+
+	draw.fb.addr = malloc(draw.fb.size);
+	assert(draw.fb.addr);
+
+	memset(draw.fb.addr, 0xff, draw.fb.size);
+
+	struct nvnc *server = nvnc_open("127.0.0.1", 5900);
+
+	nvnc_set_dimensions(server, draw.fb.width, draw.fb.height,
+			    draw.fb.fourcc_format);
+	nvnc_set_name(server, "Draw");
+	nvnc_set_fb_req_fn(server, on_fb_req);
+	nvnc_set_pointer_fn(server, on_pointer_event);
+	nvnc_set_userdata(server, &draw);
+
+	uv_run(uv_default_loop(), UV_RUN_DEFAULT);
+
+	nvnc_close(server);
+}