C++ (Cpp) openFb Examples

Example #1

File: hwc_utils.cpp Project: JUDGEno1/Project-M

// Opens Framebuffer device
static void openFramebufferDevice(hwc_context_t *ctx)
{
    hw_module_t const *module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        framebuffer_open(module, &(ctx->mFbDev));
        private_module_t* m = reinterpret_cast<private_module_t*>(
                ctx->mFbDev->common.module);
        //xres, yres may not be 32 aligned
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xres = m->info.xres;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].yres = m->info.yres;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xdpi = ctx->mFbDev->xdpi;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].ydpi = ctx->mFbDev->ydpi;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period =
                1000000000l / ctx->mFbDev->fps;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].fd = openFb(HWC_DISPLAY_PRIMARY);
    }
}

Example #2

File: hwc_utils.cpp Project: XperiaZProject/platform-hardware-qcom-display

static int openFramebufferDevice(hwc_context_t *ctx)
{
    struct fb_fix_screeninfo finfo;
    struct fb_var_screeninfo info;

    int fb_fd = openFb(HWC_DISPLAY_PRIMARY);

    if (ioctl(fb_fd, FBIOGET_VSCREENINFO, &info) == -1)
        return -errno;

    if (int(info.width) <= 0 || int(info.height) <= 0) {
        // the driver doesn't return that information
        // default to 160 dpi
        info.width  = ((info.xres * 25.4f)/160.0f + 0.5f);
        info.height = ((info.yres * 25.4f)/160.0f + 0.5f);
    }

    float xdpi = (info.xres * 25.4f) / info.width;
    float ydpi = (info.yres * 25.4f) / info.height;

#ifdef MSMFB_METADATA_GET
    struct msmfb_metadata metadata;
    memset(&metadata, 0 , sizeof(metadata));
    metadata.op = metadata_op_frame_rate;

    if (ioctl(fb_fd, MSMFB_METADATA_GET, &metadata) == -1) {
        ALOGE("Error retrieving panel frame rate");
        return -errno;
    }

    float fps  = metadata.data.panel_frame_rate;
#else
    //XXX: Remove reserved field usage on all baselines
    //The reserved[3] field is used to store FPS by the driver.
    float fps  = info.reserved[3] & 0xFF;
#endif

    if (ioctl(fb_fd, FBIOGET_FSCREENINFO, &finfo) == -1)
        return -errno;

    if (finfo.smem_len <= 0)
        return -errno;

    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].fd = fb_fd;
    //xres, yres may not be 32 aligned
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].stride = finfo.line_length /(info.xres/8);
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xres = info.xres;
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].yres = info.yres;
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xdpi = xdpi;
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].ydpi = ydpi;
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period = 1000000000l / fps;

    //Unblank primary on first boot
    if(ioctl(fb_fd, FBIOBLANK,FB_BLANK_UNBLANK) < 0) {
        ALOGE("%s: Failed to unblank display", __FUNCTION__);
        return -errno;
    }
    ctx->dpyAttr[HWC_DISPLAY_PRIMARY].isActive = true;

    return 0;
}