From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.ffmpeg.org (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTPS id 047244DD30 for ; Wed, 4 Jun 2025 17:28:16 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.ffmpeg.org (Postfix) with ESMTP id 7557768D799; Wed, 4 Jun 2025 20:28:08 +0300 (EEST) Received: from mail-ed1-f42.google.com (mail-ed1-f42.google.com [209.85.208.42]) by ffbox0-bg.ffmpeg.org (Postfix) with ESMTPS id 388C168CEBF for ; Wed, 4 Jun 2025 20:28:02 +0300 (EEST) Received: by mail-ed1-f42.google.com with SMTP id 4fb4d7f45d1cf-6000791e832so12315a12.1 for ; Wed, 04 Jun 2025 10:28:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749058081; x=1749662881; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=HMxDGwqajs5PjadxPXXitSukLgKfxRggM2EfCCegCb8=; b=Ju13++W7AexfekcBbhYyd1lvRQFSqqHNezB792roJYcQjfhBT4YBq+MLgdqTTFh+37 cLJoaRF4LD8d0psv/gIQgkM9NwCy5ZGVJP0WJSX0aoB/WsNtEbgO8efVx9yJDRfQ4Kyp VfcDKCX24MSJ0GECto12XwkKQpMEojsjZsiJcvHYSEUcLy8XCkNKjYmGU2zWx1bkzCJp ZD+4VPX2D6HE6sacVWGF7xAOVY/LQ3Iv/sMCtOhFOO1gUfoKGXF5jY6bA/OXp+NbVy3s Ppqlh1flrdWMMoaS34hHOOxG/TMqtkE6BeaX9YbA7YA5WvulwTsoVhPY4g+jIDFu4Kui BoSg== X-Gm-Message-State: AOJu0YwHBAMQZR6Ntl8KaxQyM9oo261jBjd6iiMEQKY3kDcyNeCBOUmz aEf2Ac+Zr0QmSlAv4nRyafLd2VjVbTcNuJHI372ZIU7/NcqzeapNM5iCMsoEF5ZdxOLA73Ujca7 bkYsEjMykCOMzYEHTnIjczjSTRL9ekS9D84Ayxod3wWj8DYgLVj+zNMQzCLA= X-Gm-Gg: ASbGnct1JLKCdKWBAVw8gyuWfWZYY3gq6PsnbAHpCZ586r23wYMBL0D6MJ0pZvnDvg6 utQ/FdX4Uzd2InCt4/tdlEyDuNEPbX9T+KctfQdO2uh7qF9UBc+i3UUaP2fLVubS6LYFD6VfHSX O8G4kVZ2pJAy8yWjuXVvR9m0Y6o+npVDQoqiA0olIv+affyYX1Ls+Kgwzgp+jNI0s7mgeAqGZRE 7Q6jkJoE1s= X-Google-Smtp-Source: AGHT+IESLw7tNfZv42jDbAQn0EAtUVtvMupE4vI4PzWkLsoAPe+YujaQEku6DM/74ar1hpvUGtO4JD+99ly0uwzGGKY= X-Received: by 2002:aa7:cb4f:0:b0:607:2070:3a4 with SMTP id 4fb4d7f45d1cf-607207006b3mr18806a12.2.1749058080787; Wed, 04 Jun 2025 10:28:00 -0700 (PDT) MIME-Version: 1.0 Date: Wed, 4 Jun 2025 10:27:23 -0700 X-Gm-Features: AX0GCFucV8lBeHPPb8GWzrTBqazyBdBRUAJ4NlmhbITHYxJOa77r4RogQ8OKBcc Message-ID: To: ffmpeg-devel@ffmpeg.org Content-Type: multipart/mixed; boundary="00000000000099afc30636c2517f" Subject: [FFmpeg-devel] [PATCH] libavutil/display: improve av_display_rotation_get for reflections X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Syed AbuTalib via ffmpeg-devel Reply-To: FFmpeg development discussions and patches Cc: Syed AbuTalib Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: --00000000000099afc30636c2517f Content-Type: text/plain; charset="UTF-8" The av_display_rotation_get function previously yielded inconsistent angles for certain reflected (mirrored) matrices. For instance, a matrix representing a -45 degree rotation followed by a horizontal flip resulted in 135 degrees, while the desired interpretation after canonicalizing the reflection is 45 degrees. This patch revises av_display_rotation_get to: 1. Detect reflections by checking the determinant of the 2x2 transform. 2. If a reflection is detected, it canonicalizes the matrix by effectively negating the components derived from the first column (m0, m3) before calculating the atan2 arguments. This is equivalent to extracting the rotation from M * F_h (where F_h is a horizontal flip). 3. The final negation in the return path is preserved. This change ensures more predictable rotation angle extraction when reflections are involved. For example, a pure horizontal flip now correctly reports 0 degrees. The FATE test in libavutil/tests/display.c has been updated: - The original test sequence now has assertions checking against the new, correct behavior of the patched function. - An additional 8 comprehensive test cases have been added to cover 0, 90, 180, 270 degree rotations, both unflipped and when composed with a horizontal flip. - The FATE reference file for 'fate-display' has been updated to reflect these changes and new test outputs. All tests now pass with this revised logic. Signed-off-by: Syed AbuTalib --00000000000099afc30636c2517f Content-Type: application/octet-stream; name="0001-libavutil-display-improve-av_display_rotation_get-fo.patch" Content-Disposition: attachment; filename="0001-libavutil-display-improve-av_display_rotation_get-fo.patch" Content-Transfer-Encoding: base64 Content-ID: X-Attachment-Id: f_mbi7zw990 RnJvbSBkZDRhNWI0YTY5ZjNjZTZiZThmMWZmYWRmMzhkMzkzYWE2OGFmODJhIE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBTeWVkIEFidVRhbGliIDxsb3drZXlAZ29vZ2xlLmNvbT4KRGF0 ZTogV2VkLCAyOCBNYXkgMjAyNSAwMjo1OTowNyArMDAwMApTdWJqZWN0OiBbUEFUQ0hdIGxpYmF2 dXRpbC9kaXNwbGF5OiBpbXByb3ZlIGF2X2Rpc3BsYXlfcm90YXRpb25fZ2V0IGZvcgogcmVmbGVj dGlvbnMKClRoZSBhdl9kaXNwbGF5X3JvdGF0aW9uX2dldCBmdW5jdGlvbiBwcmV2aW91c2x5IHlp ZWxkZWQgaW5jb25zaXN0ZW50CmFuZ2xlcyBmb3IgY2VydGFpbiByZWZsZWN0ZWQgKG1pcnJvcmVk KSBtYXRyaWNlcy4gRm9yIGluc3RhbmNlLAphIG1hdHJpeCByZXByZXNlbnRpbmcgYSAtNDUgZGVn cmVlIHJvdGF0aW9uIGZvbGxvd2VkIGJ5IGEgaG9yaXpvbnRhbApmbGlwIHJlc3VsdGVkIGluIDEz 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