From 8118d6460532d42cb3a09f63a9cf10fa6913d32b Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Wed, 24 Apr 2024 11:03:24 +0800
Subject: [PATCH 5/5] HACK: render: egl: Extract dmabuf from mali shared EGL
 wl_buffer

For scanning out fullscreen view.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 render/egl.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/render/egl.c b/render/egl.c
index 27a26b5..c4e7999 100644
--- a/render/egl.c
+++ b/render/egl.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <gbm.h>
+#include <sys/stat.h>
 #include <wlr/interfaces/wlr_buffer.h>
 #include <wlr/render/egl.h>
 #include <wlr/util/log.h>
@@ -378,6 +379,49 @@ static bool egl_init_display(struct wlr_egl *egl, EGLDisplay display) {
 	return true;
 }
 
+static bool egl_buffer_get_dmabuf(struct wlr_buffer *wlr_buffer,
+		struct wlr_dmabuf_attributes *attribs) {
+	struct wlr_egl_buffer *buffer =
+		wl_container_of(wlr_buffer, buffer, base);
+
+	/* HACK: It's a guessed struct for mali_buffer_sharing extension */
+	struct mali_buffer_sharing_info {
+		int fd;
+		int width;
+		int height;
+		int stride;
+		uint32_t fourcc;
+	};
+
+	struct mali_buffer_sharing_info *info =
+		wl_resource_get_user_data(buffer->resource);
+	if (!info) {
+		return false;
+	}
+
+	/* Check it carefully! */
+	struct stat s;
+	if (fstat(info->fd, &s) < 0 ||
+		s.st_size < (wlr_buffer->width * wlr_buffer->height) ||
+		info->width != wlr_buffer->width ||
+		info->height != wlr_buffer->height ||
+		info->stride < wlr_buffer->width) {
+		return false;
+	}
+
+	attribs->width = wlr_buffer->width;
+	attribs->height = wlr_buffer->height;
+	attribs->modifier = DRM_FORMAT_MOD_INVALID;
+	attribs->n_planes = 1;
+	attribs->offset[0] = 0;
+
+	attribs->stride[0] = info->stride;
+	attribs->fd[0] = info->fd;
+	attribs->format = info->fourcc;
+
+	return true;
+}
+
 static void egl_buffer_destroy(struct wlr_buffer *wlr_buffer) {
 	struct wlr_egl_buffer *buffer =
 		wl_container_of(wlr_buffer, buffer, base);
@@ -387,6 +431,7 @@ static void egl_buffer_destroy(struct wlr_buffer *wlr_buffer) {
 }
 
 static const struct wlr_buffer_impl egl_buffer_impl = {
+	.get_dmabuf = egl_buffer_get_dmabuf,
 	.destroy = egl_buffer_destroy,
 };
 
-- 
2.20.1