From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Po Lu Newsgroups: gmane.emacs.devel Subject: Re: Text shadows Date: Sun, 12 Mar 2023 16:46:53 +0800 Message-ID: <87356acq6a.fsf@yahoo.com> References: <72650A07-DEC8-4E08-A524-5C7AF804F3CB@gmail.com> <83mt4iv3xa.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="3173"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Eli Zaretskii , emacs-devel@gnu.org To: Kai Ma Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Mar 12 09:48:10 2023 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pbHNB-0000YZ-NZ for ged-emacs-devel@m.gmane-mx.org; Sun, 12 Mar 2023 09:48:09 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pbHMI-00088C-Fx; Sun, 12 Mar 2023 04:47:14 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pbHMH-000883-4Q for emacs-devel@gnu.org; Sun, 12 Mar 2023 04:47:13 -0400 Original-Received: from sonic313-10.consmr.mail.ne1.yahoo.com ([66.163.185.33]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1pbHME-0007rz-S2 for emacs-devel@gnu.org; Sun, 12 Mar 2023 04:47:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1678610825; bh=CoJN0nuNsHMOHJxh/VJBm268usBvC7ZG76A2npBL4AA=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From:Subject:Reply-To; b=WZJtusuwHujSCm15umi4lvBBJC+uqMwTdu9YVFwaYNTzLHUeOCoFXp+xYwModqI0drA8owT4kme4VgHMMG1N6/OayNYaYzDdF4AkpU5p5vTmqTX5/BsZZzNvGZIRKwCs+mRUKH71eAgbVQeRyVY6RIVNcK5+NDlhmddFlkd/TZ6WednyFolwAmQIx81ffQybuNtBKyGFTWiEsESuXOZ7HLHFRuS1ejhCqc5/WcbZh5SoeA6Qpw+r6L2H7X06JE2gCUkNgiAOKZ2RrccPlrNso56s2TP/OkN895KUv3N/5S2TXCk1ZWtL17y4uf+OHXbSMgga9OHOP8wV0aee7/Y8bQ== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1678610825; bh=rW+7V0oRh5EOvFSRTchO1z6C+ZkW6/wf0vJJXm1PbH0=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=JhXXMEU5UEsr4poMoKtZ0tuGOaRlnY3kSKQPM64tbgxa0rFj/c3/QnBpIqpBeVmzmfTvB681rctWHBBQHBbXhfHuzq1OTlP52dyu1jKwmGTAWB4wfxXcebhjrwNjDaVpsWdhpBN40Oe3FcNFXwcuCJqPA2HEUiHn9cyIsovgT7tU+1OIjRrJiG0RgzVsjT5pPR2LotAxpqKBvcXlCrqL0BetCm+LeWUdz1yiswU7P7Aoun8SSri3w/97rLXpnMCMXWnfGLnJq+Zcrm1GbHUKr+4TGrn0CE9i+SnmcEfcN6gqpzgFnVGJhFQRHpfpeE2eeMJFCG/V+lI6w60j7VvclA== X-YMail-OSG: HBurLJkVM1mkhHovn6aaFzBZBZVoywcAATFWu4tIUnd68ArMk99hAd8lan0C1IF PEhpvNiVPRq4Cqv8IuvShV5Sdsg3tkvecLmqxkuSPOGlY3vLM4eUMXdf4q5TCgQFQDnqYlk_j1cx .0NIh05Vgnp6m6OzIEw8gxkDCMRX_PvrjAM_4zffn8t8M8gfxLo7MSWYNbkomiud8vsMs7ckM34j YcIqFtCuQmW_8fAoP8j.Bqxxn6gFcQjJ_O6qB6_Np4YijbCCWRTtHjmqRZTy.bR2C1.kAMSFPWpG FC_LlDmvfio5YOrEHUOMFyrb1Ghckf9t.mQUeMX2wLgg5cxuklDsAkUOudO_zFpRxhLw1bJTVbwu hnpRVVv1mvqgqjtWTfjyNB2Z0hPpcGVeDa.ykQ94T81YDBFlvJg.TvIUI6CglzUAVHxnyO6gxopI Zw33EI.LBYi34FhhDDwNmzaoFjth_l.Te503AYIilN2vpA663zHUsz1o3.M0h8BzxE9D.ADxRRmX dieYHodkl3RnwnNmXR8t5xawkb6mDx21SwtjbCTYVnuc87AO58s1uuoyS7AS9Z0oCfdAdIvetYe3 tpUdBhzWlCDVg5k7fO5cgtZvVlWTcgD0p1eG5V9pNto0uSj3YJrRbaSae9LLwrz6wpivi915q3oe MX5NFPRgyuXtYEt5ewR5shllyc4eyMzWpZV4PfRqCm_NvVYBpfK94YYNIEohYK473YvNVZAH9fW7 S.LO7TiG8qmNmCzm.pjwa6haVRyinomGuCWQgJRTu1kofnd9QmTzoyOx0y_4_mYPwu0c8ygvGmR2 qXz_9lthyWPY9HKkCFB.RDN2pyuSsVme9k1h7IBg14 X-Sonic-MF: X-Sonic-ID: dba89d9e-d994-4e87-92aa-403c54b11ddd Original-Received: from sonic.gate.mail.ne1.yahoo.com by sonic313.consmr.mail.ne1.yahoo.com with HTTP; Sun, 12 Mar 2023 08:47:05 +0000 Original-Received: by hermes--production-sg3-67c57bccff-l44jm (Yahoo Inc. Hermes SMTP Server) with ESMTPA ID 00c87232878c3aff69343f85f2258db8; Sun, 12 Mar 2023 08:46:58 +0000 (UTC) In-Reply-To: (Kai Ma's message of "Sun, 12 Mar 2023 16:24:17 +0800") X-Mailer: WebService/1.1.21284 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Received-SPF: pass client-ip=66.163.185.33; envelope-from=luangruo@yahoo.com; helo=sonic313-10.consmr.mail.ne1.yahoo.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:304355 Archived-At: Kai Ma writes: >> On Mar 12, 2023, at 15:12, Eli Zaretskii wrote: >>=20 >>> From: Kai Ma >>> Date: Sun, 12 Mar 2023 12:06:28 +0800 >>>=20 >>> Recently, I implemented the =E2=80=9Ctext shadows=E2=80=9D feature for = Cairo-powered windowing systems, including X11 and Wayland. See [1] if you= wonder what that looks like. >>=20 >> Which parts of the feature implementation really require Cairo? IOW, >> why cannot this be available to non-Cairo builds as well? > > Theoretically, nothing. I targeted Cairo because (I think) it is the mos= t popular option on GNU/Linux. > > Speaking of this specific implementation, gaussian_blur() relies on a spe= cific Cairo image format ARGB32, (this assumption could be easily removed),= and then it is used by ftcrfont_draw() to generate shadows. > > I don=E2=80=99t know whether non-Cairo builds (non-cairo X, win32) can/sh= ould use gaussian_blur() though, since I=E2=80=99m not familiar with them. Non-Cairo builds and Cairo builds alike should use the X Rendering Extension, where an arbitrary blur kernel is a standard picture filter. Cairo builds on X should as well. P.S: the GNU project rejects the Unix convention that `foo()' refers to the function `foo': `foo()' is a function declarator that returns int and takes any number of arguments, or alternatively a function call to `foo' with no arguments.