From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CB5A9C3A5A6 for ; Sat, 31 Aug 2019 17:26:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9786423405 for ; Sat, 31 Aug 2019 17:26:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="EnZ5tugQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728397AbfHaRZ4 (ORCPT ); Sat, 31 Aug 2019 13:25:56 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:37048 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728119AbfHaRZ4 (ORCPT ); Sat, 31 Aug 2019 13:25:56 -0400 Received: by mail-pg1-f195.google.com with SMTP id d1so5140322pgp.4 for ; Sat, 31 Aug 2019 10:25:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=W+lYISWLd+dLXJ92WanX0SAmm2/oFeQWs1BfMT2py3w=; b=EnZ5tugQP34UeJgn4IKjljMkw6g/r2XQhYWuLXTTBrbhaKStb+RM0UVzzufhpp1qLv Ff8Ywjqj3au5uIP4uAbejFYh1DshxGMprh90esrq87mkg/MlR5mfIHwPLT1vOCXMZrYq u26RhYDgu8LqLRf6DrYGSGHXLgs6jjGIv3AGIrWuoQ3tMsU+WG4WFTtG7dudJQVTJxRb KXhMt6ktrAEKhhMHN/L3muV7uzKb83a/VxYfVsNltHbsPc0EKYfGdu962XXPRbJEjcOe x6loROZolOFlkaCR9Kapw0tT+ePPv4b1WsQ88b1gzFjlqvR9pJtoegxkY3AdX5OPoWrZ 4vyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=W+lYISWLd+dLXJ92WanX0SAmm2/oFeQWs1BfMT2py3w=; b=Bcg0J4pZY+ORK7pMYe2Zhm6X7zFW1mfbe/tbPkHUUhGIG+2keje5vPD59pSkMuGX0C 4816uBTnqSjsqU4bzUpmD6ddYs6pwBxdmda6Jukf9d135mPMntl0Bj5s5Ss1zOt3Fe3a BDk7qZvJk5WJih4OTYR723EhsfCOUUyFcjUezDO/rmxbNoT4mz0C/3uRBK6HY5GNi5Ao I/FXxaswLDLafgKqtOzsB4Q1iR1etCqN3KkREwiFpTaK2m0Q7G1GR8BVpI/gNRzbmmUy UoFKNXCIOgIBNA4H2CmbA4cxNLjGw3dvWFnClR1rnM7JwL23dXSEbhsVXdBuNAgnr1eA RlUw== X-Gm-Message-State: APjAAAWtbUKEEsmCjZtQsXjTIQSB9wqDPPrhCL6JhRBA9Sq4hs+PhlZ+ NvDqLc/J4xBQCO2tWo6rQ8Y= X-Google-Smtp-Source: APXvYqxdoO9pFlTeP02tVUV36XLk12Ox0QdQ2UHgL0ppo691dkIMsMrSYKu0tKtaDl5y02Jj5/kgUg== X-Received: by 2002:a17:90a:de0f:: with SMTP id m15mr4855206pjv.18.1567272355239; Sat, 31 Aug 2019 10:25:55 -0700 (PDT) Received: from raspberrypi ([61.83.141.141]) by smtp.gmail.com with ESMTPSA id v8sm6151231pje.6.2019.08.31.10.25.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 31 Aug 2019 10:25:54 -0700 (PDT) Date: Sat, 31 Aug 2019 18:25:46 +0100 From: Sidong Yang To: Rodrigo Siqueira Cc: Haneen Mohammed , Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH] drm/vkms: Use alpha value to blend values. Message-ID: <20190831172546.GA1972@raspberrypi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use alpha value to blend source value and destination value Instead of just overwrite with source value. Signed-off-by: Sidong Yang --- drivers/gpu/drm/vkms/vkms_composer.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c index d5585695c64d..b776185e5cb5 100644 --- a/drivers/gpu/drm/vkms/vkms_composer.c +++ b/drivers/gpu/drm/vkms/vkms_composer.c @@ -75,6 +75,9 @@ static void blend(void *vaddr_dst, void *vaddr_src, int y_limit = y_src + h_dst; int x_limit = x_src + w_dst; + u8 *src, *dst; + u32 alpha, inv_alpha; + for (i = y_src, i_dst = y_dst; i < y_limit; ++i) { for (j = x_src, j_dst = x_dst; j < x_limit; ++j) { offset_dst = dest_composer->offset @@ -84,8 +87,14 @@ static void blend(void *vaddr_dst, void *vaddr_src, + (i * src_composer->pitch) + (j * src_composer->cpp); - memcpy(vaddr_dst + offset_dst, - vaddr_src + offset_src, sizeof(u32)); + src = vaddr_src + offset_src; + dst = vaddr_dst + offset_dst; + alpha = src[3] + 1; + inv_alpha = 256 - src[3]; + dst[0] = (alpha * src[0] + inv_alpha * dst[0]) >> 8; + dst[1] = (alpha * src[1] + inv_alpha * dst[1]) >> 8; + dst[2] = (alpha * src[2] + inv_alpha * dst[2]) >> 8; + dst[3] = 0xff; } i_dst++; } -- 2.20.1