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