From 5aaeaa28e782647843570f01b4661a65ff3aa376 Mon Sep 17 00:00:00 2001
From: Kamil Debski <k.debski@samsung.com>
Date: Tue, 6 Mar 2012 10:33:02 +0100
Subject: v4l-mfc-example: version 0.1

---
 v4l2-mfc-example/fb.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 v4l2-mfc-example/fb.c

(limited to 'v4l2-mfc-example/fb.c')

diff --git a/v4l2-mfc-example/fb.c b/v4l2-mfc-example/fb.c
new file mode 100644
index 0000000..a2d0bcb
--- /dev/null
+++ b/v4l2-mfc-example/fb.c
@@ -0,0 +1,118 @@
+/*
+ * V4L2 Codec decoding example application
+ * Kamil Debski <k.debski@samsung.com>
+ *
+ * Framebuffer operations
+ *
+ * Copyright 2012 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <linux/fb.h>
+
+#include "common.h"
+#include "fb.h"
+
+int fb_open(struct instance *i, char *name)
+{
+	struct fb_var_screeninfo fbinfo;
+	int ret;
+
+	i->fb.fd = open(name, O_RDWR);
+	if (i->fb.fd < 0) {
+		err("Failed to open frame buffer: %s", name);
+		return -1;
+	}
+
+	ret = ioctl(i->fb.fd, FBIOGET_VSCREENINFO, &fbinfo);
+	if (ret != 0) {
+		err("Failed to get frame buffer properties");
+		return -1;
+	}
+	dbg("Framebuffer properties: xres=%d, yres=%d, bpp=%d",
+		fbinfo.xres, fbinfo.yres, fbinfo.bits_per_pixel);
+	dbg("Virtual resolution: vxres=%d vyres=%d",
+		fbinfo.xres_virtual, fbinfo.yres_virtual);
+
+	i->fb.width		= fbinfo.xres;
+	i->fb.height		= fbinfo.yres;
+	i->fb.virt_width	= fbinfo.xres_virtual;
+	i->fb.virt_height	= fbinfo.yres_virtual;
+	i->fb.bpp		= fbinfo.bits_per_pixel;
+	i->fb.stride		= i->fb.virt_width * i->fb.bpp / 8;
+	i->fb.full_size		= i->fb.stride * i->fb.virt_height;
+	i->fb.size		= i->fb.stride * fbinfo.yres;
+
+	i->fb.p[0] = mmap(0, i->fb.full_size, PROT_WRITE | PROT_READ,
+				MAP_SHARED, i->fb.fd, 0);
+
+	i->fb.buffers = 1;
+
+	if (i->fb.double_buf) {
+		i->fb.p[1] = i->fb.p[0] + i->fb.size;
+		i->fb.buffers = 2;
+	}
+
+	return fb_set_virt_y_offset(i, 0);
+}
+
+int fb_set_virt_y_offset(struct instance *i, int yoffs)
+{
+	struct fb_var_screeninfo var;
+	int ret;
+
+	ret = ioctl(i->fb.fd, FBIOGET_VSCREENINFO, &var);
+	if (ret != 0) {
+		err("Failed to get frame buffer screen information");
+		return -1;
+	}
+
+	var.yoffset = yoffs;
+
+	ret = ioctl(i->fb.fd, FBIOPAN_DISPLAY, &var);
+	if (ret != 0) {
+		err("Failed to set y_offset of frame buffer");
+		return -1;
+	}
+
+	return 0;
+}
+
+int fb_wait_for_vsync(struct instance *i)
+{
+	int ret;
+	unsigned long temp;
+
+	ret = ioctl(i->fb.fd, FBIO_WAITFORVSYNC, &temp);
+	if (ret < 0) {
+		err("Wait for vsync failed");
+		return -1;
+	}
+	return 0;
+}
+
+void fb_close(struct instance *i)
+{
+	fb_set_virt_y_offset(i, 0);
+	munmap(i->fb.p[0], i->fb.full_size);
+	close(i->fb.fd);
+}
+
-- 
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