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- /*
- * 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
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