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raspi: cover the linux framebuffer with black background

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This commit is contained in:
Stefan Seyfried
2013-10-22 00:37:19 +02:00
parent c697d633aa
commit de0950ffa9
1 changed files with 32 additions and 0 deletions
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32
raspi/glfb.cpp
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@@ -46,6 +46,11 @@ static VC_RECT_T dst_rect;
static void *image;
static int pitch;
static VC_IMAGE_TYPE_T type = VC_IMAGE_ARGB8888;
/* second element: black background which covers the framebuffer */
static DISPMANX_RESOURCE_HANDLE_T bg_res;
static uint32_t bg_img_ptr;
static DISPMANX_ELEMENT_HANDLE_T bg_element;
static VC_IMAGE_TYPE_T bg_type = VC_IMAGE_RGB565;
static OpenThreads::Mutex blit_mutex;
static OpenThreads::Condition blit_cond;
@@ -86,10 +91,14 @@ GLFramebuffer::~GLFramebuffer()
CHECK(update);
ret = vc_dispmanx_element_remove(update, element);
CHECK(ret == 0);
ret = vc_dispmanx_element_remove(update, bg_element);
CHECK(ret == 0);
ret = vc_dispmanx_update_submit_sync(update);
CHECK(ret == 0);
ret = vc_dispmanx_resource_delete(res);
CHECK(ret == 0);
ret = vc_dispmanx_resource_delete(bg_res);
CHECK(ret == 0);
ret = vc_dispmanx_display_close(display);
CHECK(ret == 0);
}
@@ -138,6 +147,15 @@ void GLFramebuffer::setup()
osd_buf.resize(pitch * height * 2);
lt_info("GLFB: Display is %d x %d, FB is %d x %d, memory size %d\n",
output_info.width, output_info.height, width, height, osd_buf.size());
/* black background */
uint16_t bg[16]; /* 16 bpp, 16x1 bitmap. smaller is not useful, need pitch 32 anyway */
memset(bg, 0, sizeof(bg));
bg_res = vc_dispmanx_resource_create(bg_type, 16, 1, &bg_img_ptr);
CHECK(bg_res);
vc_dispmanx_rect_set(&dst_rect, 0, 0, 16, 1);
ret = vc_dispmanx_resource_write_data(bg_res, bg_type, 16 * sizeof(uint16_t), bg, &dst_rect);
CHECK(ret == 0);
/* framebuffer */
image = &osd_buf[0];
/* initialize to half-transparent grey */
memset(image, 0x7f, osd_buf.size());
@@ -148,6 +166,20 @@ void GLFramebuffer::setup()
CHECK(ret == 0);
update = vc_dispmanx_update_start(10);
CHECK(update);
/* background image to cover the linux fb */
vc_dispmanx_rect_set(&src_rect, 0, 0, 16 << 16, 1 << 16);
vc_dispmanx_rect_set(&dsp_rect, 0, 0, output_info.width, output_info.height);
bg_element = vc_dispmanx_element_add(update,
display,
0, /* bg layer, linux framebuffer is -127 */
&dsp_rect,
bg_res,
&src_rect,
DISPMANX_PROTECTION_NONE,
&alpha,
NULL,
DISPMANX_NO_ROTATE);
/* our real framebuffer */
vc_dispmanx_rect_set(&src_rect, 0, 0, width << 16, height << 16);
vc_dispmanx_rect_set(&dsp_rect, 0, 0, output_info.width, output_info.height);
element = vc_dispmanx_element_add(update,