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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 "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
|
|
