backen_kms.c

static struct gbm_bo *gbm_kms_bo_create(struct gbm_device *gbm,
					uint32_t width, uint32_t height,
					uint32_t format, uint32_t usage)
{
	struct gbm_kms_device *dev = (struct gbm_kms_device*)gbm;
	struct gbm_kms_bo *bo;
	unsigned attr[] = {
		KMS_BO_TYPE, KMS_BO_TYPE_SCANOUT_X8R8G8B8,
		KMS_WIDTH, 0,
		KMS_HEIGHT, 0,
		KMS_TERMINATE_PROP_LIST
	};

	GBM_DEBUG("%s: %s: %d\n", __FILE__, __func__, __LINE__);

	if (!(bo = calloc(1, sizeof(struct gbm_kms_bo))))
		return NULL;

	switch (format) {
		// 32bpp
	case GBM_FORMAT_ARGB8888:
	case GBM_FORMAT_XRGB8888:
		break;
	default:
		// unsupported...
		goto error;
	}

	if (usage & GBM_BO_USE_CURSOR_64X64)
		attr[1] = KMS_BO_TYPE_CURSOR_64X64_A8R8G8B8;
	attr[3] = width;
	attr[5] = height;

	// Create BO
	if (kms_bo_create(dev->kms, attr, &bo->bo))
		goto error;

	bo->base.gbm = gbm;
	bo->base.width = width;
	bo->base.height = height;
	bo->base.format = format;

	kms_bo_get_prop(bo->bo, KMS_HANDLE, &bo->base.handle.u32);
	kms_bo_get_prop(bo->bo, KMS_PITCH, &bo->base.stride);

	bo->size = bo->base.stride * bo->base.height;

	if (drmPrimeHandleToFD(dev->base.base.fd, bo->base.handle.u32, DRM_CLOEXEC, &bo->fd)) {
		GBM_DEBUG("%s: %s: drmPrimeHandleToFD() failed. %s\n", __FILE__, __func__, strerror(errno));
		goto error;
	}

	// Map to the user space for bo_write
	if (usage & GBM_BO_USE_WRITE) {
		if (kms_bo_map(bo->bo, &bo->addr))
			goto error;
	}

	return (struct gbm_bo*)bo;

 error:
	GBM_DEBUG("%s: %s: %d: ERROR!!!!\n", __FILE__, __func__, __LINE__);
	gbm_kms_bo_destroy((struct gbm_bo*)bo);
	return NULL;
}