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virtio-gpu: Optimize 2D resource data transfer 

The following points sometimes can reduce much data
to copy:
1. When width matches, we can transfer data with one
call of iov_to_buf().
2. Only the required height need to transfer, not
whole image.

Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230612021358.25068-1-zhukeqian1@huawei.com>
This commit is contained in:
Keqian Zhu 2023-06-12 10:13:58 +08:00 committed by Marc-André Lureau
parent 176e3783f2
commit b097b80bc9
1 changed files with 11 additions and 11 deletions
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22
hw/display/virtio-gpu.c
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@ -438,11 +438,11 @@ static void virtio_gpu_transfer_to_host_2d(VirtIOGPU *g,
struct virtio_gpu_ctrl_command *cmd)
{
struct virtio_gpu_simple_resource *res;
int h;
int h, bpp;
uint32_t src_offset, dst_offset, stride;
int bpp;
pixman_format_code_t format;
struct virtio_gpu_transfer_to_host_2d t2d;
void *img_data;
VIRTIO_GPU_FILL_CMD(t2d);
virtio_gpu_t2d_bswap(&t2d);
@ -471,23 +471,23 @@ static void virtio_gpu_transfer_to_host_2d(VirtIOGPU *g,
format = pixman_image_get_format(res->image);
bpp = DIV_ROUND_UP(PIXMAN_FORMAT_BPP(format), 8);
stride = pixman_image_get_stride(res->image);
img_data = pixman_image_get_data(res->image);
if (t2d.offset || t2d.r.x || t2d.r.y ||
t2d.r.width != pixman_image_get_width(res->image)) {
void *img_data = pixman_image_get_data(res->image);
if (t2d.r.x || t2d.r.width != pixman_image_get_width(res->image)) {
for (h = 0; h < t2d.r.height; h++) {
src_offset = t2d.offset + stride * h;
dst_offset = (t2d.r.y + h) * stride + (t2d.r.x * bpp);
iov_to_buf(res->iov, res->iov_cnt, src_offset,
(uint8_t *)img_data
+ dst_offset, t2d.r.width * bpp);
(uint8_t *)img_data + dst_offset,
t2d.r.width * bpp);
}
} else {
iov_to_buf(res->iov, res->iov_cnt, 0,
pixman_image_get_data(res->image),
pixman_image_get_stride(res->image)
* pixman_image_get_height(res->image));
src_offset = t2d.offset;
dst_offset = t2d.r.y * stride + t2d.r.x * bpp;
iov_to_buf(res->iov, res->iov_cnt, src_offset,
(uint8_t *)img_data + dst_offset,
stride * t2d.r.height);
}
}