/* * Copyright 2017 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef SkEncodedOrigin_DEFINED #define SkEncodedOrigin_DEFINED #include "include/core/SkMatrix.h" // These values match the orientation www.exif.org/Exif2-2.PDF. enum SkEncodedOrigin { kTopLeft_SkEncodedOrigin = 1, // Default kTopRight_SkEncodedOrigin = 2, // Reflected across y-axis kBottomRight_SkEncodedOrigin = 3, // Rotated 180 kBottomLeft_SkEncodedOrigin = 4, // Reflected across x-axis kLeftTop_SkEncodedOrigin = 5, // Reflected across x-axis, Rotated 90 CCW kRightTop_SkEncodedOrigin = 6, // Rotated 90 CW kRightBottom_SkEncodedOrigin = 7, // Reflected across x-axis, Rotated 90 CW kLeftBottom_SkEncodedOrigin = 8, // Rotated 90 CCW kDefault_SkEncodedOrigin = kTopLeft_SkEncodedOrigin, kLast_SkEncodedOrigin = kLeftBottom_SkEncodedOrigin, }; /** * Given an encoded origin and the width and height of the source data, returns a matrix * that transforms the source rectangle [0, 0, w, h] to a correctly oriented destination * rectangle, with the upper left corner still at [0, 0]. */ static inline SkMatrix SkEncodedOriginToMatrix(SkEncodedOrigin origin, int w, int h) { switch (origin) { case kTopLeft_SkEncodedOrigin: return SkMatrix::I(); case kTopRight_SkEncodedOrigin: return SkMatrix::MakeAll(-1, 0, w, 0, 1, 0, 0, 0, 1); case kBottomRight_SkEncodedOrigin: return SkMatrix::MakeAll(-1, 0, w, 0, -1, h, 0, 0, 1); case kBottomLeft_SkEncodedOrigin: return SkMatrix::MakeAll( 1, 0, 0, 0, -1, h, 0, 0, 1); case kLeftTop_SkEncodedOrigin: return SkMatrix::MakeAll( 0, 1, 0, 1, 0, 0, 0, 0, 1); case kRightTop_SkEncodedOrigin: return SkMatrix::MakeAll( 0, -1, h, 1, 0, 0, 0, 0, 1); case kRightBottom_SkEncodedOrigin: return SkMatrix::MakeAll( 0, -1, h, -1, 0, w, 0, 0, 1); case kLeftBottom_SkEncodedOrigin: return SkMatrix::MakeAll( 0, 1, 0, -1, 0, w, 0, 0, 1); } SK_ABORT("Unexpected origin"); return SkMatrix::I(); } #endif // SkEncodedOrigin_DEFINED