<div dir="ltr">From 6553ed3ad9845113f3b2280e6fc94e2b326a7eca Mon Sep 17 00:00:00 2001 From: mchalain <<a href="mailto:marc.chalain@gmail.com">marc.chalain@gmail.com</a>> Date: Fri, 7 Jun 2013 17:18:23 +0200 Subject: [PATCH 2/2] [fbdev_backend] initialization of the first frame buffer --- src/compositor-fbdev.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/compositor-fbdev.c b/src/compositor-fbdev.c index d6d911a..e6c761f 100644 --- a/src/compositor-fbdev.c +++ b/src/compositor-fbdev.c @@ -277,7 +277,7 @@ calculate_pixman_format(struct fb_var_screeninfo *vinfo, if (finfo->visual == FB_VISUAL_DIRECTCOLOR) build_cmap(vinfo, cmap); else - /* We only handle true-colour frame buffers at the moment. */ + /* We only handle true-colour frame buffers at the moment. */ if (finfo->visual != FB_VISUAL_TRUECOLOR || vinfo->grayscale != 0) return 0; @@ -373,6 +373,11 @@ fbdev_query_screen_info(struct fbdev_output *output, int fd, return -1; } + if (varinfo.yoffset != 0) { + varinfo.yoffset = 0; + if (ioctl(fd, FBIOPAN_DISPLAY, &varinfo) < 0) + return -1; + } return 1; } @@ -409,6 +414,7 @@ fbdev_set_screen_info(struct fbdev_output *output, int fd, varinfo.blue.length = 8; varinfo.blue.msb_right = 0; + varinfo.yoffset = 0; /* Set the device's screen information. */ if (ioctl(fd, FBIOPUT_VSCREENINFO, &varinfo) < 0) { return -1; -- 1.7.9.5 </div><div class="gmail_extra"> <div class="gmail_quote">2013/6/7 Marc Chalain <<a href="mailto:marc.chalain@gmail.com" target="_blank">marc.chalain@gmail.com</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Often the frame buffer device allows the double buffering, In this case the displayed buffer could not be initialized. This is done by yoffset of the varinfo. </div> </blockquote></div> </div>