From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 18 Apr 2019 10:52:05 -0700 Message-ID: In-Reply-To: From: erik quanstrom To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> MIME-Version: 1.0 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 Subject: Re: [9fans] Understanding /dev/draw Topicbox-Message-UUID: fb0983b8-ead9-11e9-9d60-3106f5b1d025 PGRpdiBkaXI9J2F1dG8nPnRoaXMgaW1wbGVtZW50YXRpb24gaXMgZW5vdWdoIHRvIHJ1biBhY21l LGJ1dCBub3QgYSBmdWxsIHA5IHRlcm1pbmFsLiZuYnNwOyB5b3UnbGwgbmVlZCBsYXllcnMgZm9y IHRoYXQuPGRpdiBkaXI9ImF1dG8iPjxicj48L2Rpdj48ZGl2IGRpcj0iYXV0byI+LSBlcmlrPC9k aXY+PC9kaXY+PGRpdiBjbGFzcz0iZ21haWxfZXh0cmEiPjxicj48ZGl2IGNsYXNzPSJnbWFpbF9x dW90ZSI+T24gQXByIDE4LCAyMDE5IDEwOjI3LCBTa2lwIFRhdmFra29saWFuICZsdDtza2lwLnRh dmFra29saWFuQGdtYWlsLmNvbSZndDsgd3JvdGU6PGJyIHR5cGU9ImF0dHJpYnV0aW9uIiAvPjxi bG9ja3F1b3RlIGNsYXNzPSJxdW90ZSIgc3R5bGU9Im1hcmdpbjowIDAgMCAuOGV4O2JvcmRlci1s ZWZ0OjFweCAjY2NjIHNvbGlkO3BhZGRpbmctbGVmdDoxZXgiPjxkaXYgZGlyPSJsdHIiPkltcHJv dmluZyBvciByZWltcGxlbWVudGluZyBpdCBiZXR0ZXIgYXJlIGp1c3QgYXMgaW1wb3J0YW50IGFz IG9yaWdpbmFsaXR5LjwvZGl2PjxiciAvPjxkaXYgY2xhc3M9ImVsaWRlZC10ZXh0Ij48ZGl2IGRp cj0ibHRyIj5PbiBUaHUsIEFwciAxOCwgMjAxOSBhdCA5OjUxIEFNIENocmlzIE1jR2VlICZsdDs8 YSBocmVmPSJtYWlsdG86bmV3dG9uNjg4JiM2NDtnbWFpbC5jb20iPm5ld3RvbjY4OCYjNjQ7Z21h aWwuY29tPC9hPiZndDsgd3JvdGU6PGJyIC8+PC9kaXY+PGJsb2NrcXVvdGUgc3R5bGU9Im1hcmdp bjowcHggMHB4IDBweCAwLjhleDtib3JkZXItbGVmdDoxcHggc29saWQgcmdiKCAyMDQgLCAyMDQg LCAyMDQgKTtwYWRkaW5nLWxlZnQ6MWV4Ij48ZGl2IGRpcj0ibHRyIj5UaGFua3MsIHRoaXMgbG9v a3MgdG8gYmUgZXhhY3RseSB3aGF0IEkgd2FzIGhvcGluZyB0byBkby4gVGhlIGlkZWEgd2FzbiYj Mzk7dCBhcyBvcmlnaW5hbCBhcyBJIHRob3VnaHQuPGJyIC8+PC9kaXY+PGJyIC8+PGRpdiBjbGFz cz0iZWxpZGVkLXRleHQiPjxkaXYgZGlyPSJsdHIiPk9uIFRodSwgQXByIDE4LCAyMDE5IGF0IDEx OjI3IEFNIFNraXAgVGF2YWtrb2xpYW4gJmx0OzxhIGhyZWY9Im1haWx0bzpza2lwLnRhdmFra29s aWFuJiM2NDtnbWFpbC5jb20iPnNraXAudGF2YWtrb2xpYW4mIzY0O2dtYWlsLmNvbTwvYT4mZ3Q7 IHdyb3RlOjxiciAvPjwvZGl2PjxibG9ja3F1b3RlIHN0eWxlPSJtYXJnaW46MHB4IDBweCAwcHgg MC44ZXg7Ym9yZGVyLWxlZnQ6MXB4IHNvbGlkIHJnYiggMjA0ICwgMjA0ICwgMjA0ICk7cGFkZGlu Zy1sZWZ0OjFleCI+PGRpdiBkaXI9Imx0ciI+VGhpcyBtaWdodCBiZSBhIGdvb2QgcGxhY2UgdG8g c3RhcnQ6PGRpdj48YnIgLz48L2Rpdj48ZGl2PjxhIGhyZWY9Imh0dHBzOi8vYml0YnVja2V0Lm9y Zy9kaG9za2luLzl3ZWJkcmF3L3NyYy9kZWZhdWx0LyI+aHR0cHM6Ly9iaXRidWNrZXQub3JnL2Ro b3NraW4vOXdlYmRyYXcvc3JjL2RlZmF1bHQvPC9hPjxiciAvPjwvZGl2PjwvZGl2PjxiciAvPjxk aXYgY2xhc3M9ImVsaWRlZC10ZXh0Ij48ZGl2IGRpcj0ibHRyIj5PbiBUaHUsIEFwciAxOCwgMjAx OSBhdCA3OjM2IEFNIENocmlzIE1jR2VlICZsdDs8YSBocmVmPSJtYWlsdG86bmV3dG9uNjg4JiM2 NDtnbWFpbC5jb20iPm5ld3RvbjY4OCYjNjQ7Z21haWwuY29tPC9hPiZndDsgd3JvdGU6PGJyIC8+ PC9kaXY+PGJsb2NrcXVvdGUgc3R5bGU9Im1hcmdpbjowcHggMHB4IDBweCAwLjhleDtib3JkZXIt bGVmdDoxcHggc29saWQgcmdiKCAyMDQgLCAyMDQgLCAyMDQgKTtwYWRkaW5nLWxlZnQ6MWV4Ij48 ZGl2IGRpcj0ibHRyIj48ZGl2PkhpIEFsbCw8L2Rpdj48ZGl2PjxiciAvPjwvZGl2PjxkaXY+SSYj Mzk7bSBsb29raW5nIGF0IGNyZWF0aW5nIGFuIGFsdGVybmF0ZSBmaWxlc3lzdGVtIGZvciAvZGV2 L2RyYXcsIC9kZXYvbW91c2UgYW5kIC9kZXYva2JkIHRoYXQgaG9va3MgdXAgdG8gYSB3ZWIgc2Vy dmVyIHByb3ZpZGluZyBIVE1MIGludGVyZmFjZXMgKGUuZy4gY2FudmFzKSBmb3IgUGxhbiA5IFVJ LiBJJiMzOTt2ZSBiZWVuIHJlYWRpbmcgb3ZlciB0aGUgbWFudWFsIHBhZ2VzLCB3aGljaCBhcmUg cXVpdGUgZGV0YWlsZWQsIHdoaWNoIGlzIGdyZWF0LCBidXQgdGhlcmUgYXJlIHNvbWUgcG9pbnRz IG9mIGNvbmZ1c2lvbiBmb3IgbWUuPC9kaXY+PGRpdj48YnIgLz48L2Rpdj48ZGl2PkluIHBhcnRp Y3VsYXIsIC9kZXYvZHJhdyYjMzk7cyBpbnRlcmZhY2UgYW5kIGRvY3VtZW50YXRpb24ga2VlcCBy ZWZlcnJpbmcgdG8gdGhlIGNvbmNlcHQgb2YgYSAmIzM0O3dpbmRvdyYjMzQ7IGluZGlyZWN0bHku IEl0IHNlZW1zIHRoYXQgaW4gc29tZSBjYXNlcyB0aGUgc2VydmVyIHByb3ZpZGluZyAvZGV2L2Ry YXcgbmVlZHMgdG8gdHJhY2sgd2luZG93cyBhbmQgcmVmcmVzaCB0aGVtLiBCdXQsIHdoYXQgZGVm aW5lcyBhIHdpbmRvdyBpbiB0aGlzIHByb3RvY29sPyBJcyBldmVyeSBpbWFnZSBhIHdpbmRvdyBv ciBvbmx5IHNvbWUgb2YgdGhlbT88L2Rpdj48ZGl2PjxiciAvPjwvZGl2PjxkaXY+QWxzbywgSSYj Mzk7bSB0cnlpbmcgdG8gdW5kZXJzdGFuZCBob3cgb2ZmLXNjcmVlbiBpbWFnZXMsIHN1Y2ggYXMg Zm9udHMgYXJlIGxvYWRlZC4gSXQgc2VlbXMgdGhhdCBldmVyeSBpbWFnZSBtdXN0IGJlIGFzc29j aWF0ZWQgd2l0aCBhIHNjcmVlbiBhbmQgYmUgZ2l2ZW4gYSBwb3NpdGlvbiB3aXRoaW4gdGhlIHNj cmVlbi4gU28sIGhvdyBkbyB5b3UgcHJldmVudCB0aGUgaW1hZ2UgZnJvbSBiZWluZyB2aXNpYmxl IHRvIHRoZSB1c2VyPzxiciAvPjwvZGl2PjxkaXY+PGJyIC8+PC9kaXY+PGRpdj5Ib3BlZnVsbHks IGlmIEkgY2FuIHVuZGVyc3RhbmQgc29tZSBvZiB0aGUgaGlnaC1sZXZlbCBjb25jZXB0cyBoZXJl IHRoZW4gdGhlIG1hbnVhbCBwYWdlIHdpbGwgYmUgYWxsIHRoYXQgSSBuZWVkLiBEb2VzIGFueW9u ZSBoYXZlIGV4cGVyaWVuY2Ugd2l0aCB0aGlzIGFyZWEgb3IgY291bGQgcG9pbnQgbWUgdG8gaW5m b3JtYXRpb24gdGhhdCBtaWdodCBoZWxwIGNsYXJpZnkgaXQ/PC9kaXY+PGRpdj48YnIgLz48L2Rp dj48ZGl2Pk15IG5leHQgc3RlcCB3aWxsIHByb2JhYmx5IGJlIHRvIGZpZ3VyZSBvdXQgaG93IGxp Ym1lbWRyYXcgZG9lcyBhbGwgb2YgdGhpcyBvbiB0b3Agb2YgYSBmcmFtZSBidWZmZXIuPGJyIC8+ PC9kaXY+PGRpdj48YnIgLz48L2Rpdj48ZGl2PlRoYW5rcyw8L2Rpdj48ZGl2PkNocmlzPGJyIC8+ PC9kaXY+PC9kaXY+DQo8L2Jsb2NrcXVvdGU+PC9kaXY+DQo8L2Jsb2NrcXVvdGU+PC9kaXY+DQo8 L2Jsb2NrcXVvdGU+PC9kaXY+DQoNCjwvYmxvY2txdW90ZT48L2Rpdj48YnI+PC9kaXY+