[U-Boot] efi_loader: Allow width smaller than buffer stride in efi_gop Blt()

[Heinrich Schuchardt]

On 03/14/2018 04:31 AM, Ivan Gorinov wrote:
> Current implementation of Blt() in EFI_GRAPHICS_OUTPUT_PROTOCOL
> assumes the memory buffer stride (number of bytes in a row)
> always matches the rectangle Width, ignoring non-zero Delta.
> 
> Signed-off-by: Ivan Gorinov <ivan.gorinov at intel.com>

Hello Ivan,

thanks for reporting the problem. Unfortunately your patch is not based 
on the custodian's repository. You can find the upcoming EFI related 
patches in
https://github.com/agraf/u-boot.git, branch efi-next.

I tried to address your problem in
efi_loader: implement missing bit blit operations in gop
https://lists.denx.de/pipermail/u-boot/2018-February/319846.html

But I think I got it wrong as according to the UEFI specification 
'delta' is measured in bytes and not in pixels.

I will create a patch for lib/efi_loader/efi_gop.c and add you on cc. It 
would be great if you could review efi_gop.c once again.

lib/efi_selftest/efi_selftest_bitblt.c should be adjusted to test the 
use of 'delta'.

Best regards

Heinrich


> ---
>   lib/efi_loader/efi_gop.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/efi_loader/efi_gop.c b/lib/efi_loader/efi_gop.c
> index 3caddd5..362065b 100644
> --- a/lib/efi_loader/efi_gop.c
> +++ b/lib/efi_loader/efi_gop.c
> @@ -64,6 +64,7 @@ efi_status_t EFIAPI gop_blt(struct efi_gop *this, void *buffer,
>   {
>   	struct efi_gop_obj *gopobj = container_of(this, struct efi_gop_obj, ops);
>   	int i, j, line_len16, line_len32;
> +	int buffer_stride;
>   	void *fb;
>   
>   	EFI_ENTRY("%p, %p, %u, %zu, %zu, %zu, %zu,the  %zu, %zu, %zu", this,
> @@ -72,6 +73,11 @@ efi_status_t EFIAPI gop_blt(struct efi_gop *this, void *buffer,
>   	if (operation != EFI_BLT_BUFFER_TO_VIDEO)
>   		return EFI_EXIT(EFI_INVALID_PARAMETER);
>   
> +	if (delta == 0)
> +		buffer_stride = width * sizeof(u32);
> +	else
> +		buffer_stride = delta;
> +
>   	fb = gopobj->fb;
>   	line_len16 = gopobj->info.width * sizeof(u16);
>   	line_len32 = gopobj->info.width * sizeof(u32);
> @@ -87,7 +93,7 @@ efi_status_t EFIAPI gop_blt(struct efi_gop *this, void *buffer,
>   		for (i = 0; i < height; i++) {
>   			u32 *dest = fb + ((i + dy)  * line_len32) +
>   					 (dx * sizeof(u32));
> -			u32 *src = buffer + ((i + sy)  * line_len32) +
> +			u32 *src = buffer + ((i + sy) * buffer_stride) +
>   					 (sx * sizeof(u32));
>   
>   			/* Same color format, just memcpy */
> @@ -102,7 +108,7 @@ efi_status_t EFIAPI gop_blt(struct efi_gop *this, void *buffer,
>   		for (i = 0; i < height; i++) {
>   			u16 *dest = fb + ((i + dy)  * line_len16) +
>   					 (dx * sizeof(u16));
> -			u32 *src = buffer + ((i + sy)  * line_len32) +
> +			u32 *src = buffer + ((i + sy) * buffer_stride) +
>   					 (sx * sizeof(u32));
>   
>   			/* Convert from rgb888 to rgb565 */
>