diff options
Diffstat (limited to '')
| -rw-r--r-- | gfx/skia/skia/include/codec/SkEncodedOrigin.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/gfx/skia/skia/include/codec/SkEncodedOrigin.h b/gfx/skia/skia/include/codec/SkEncodedOrigin.h new file mode 100644 index 0000000000..19d083672f --- /dev/null +++ b/gfx/skia/skia/include/codec/SkEncodedOrigin.h @@ -0,0 +1,54 @@ +/* + * 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 with upper left corner at [0, 0] and origin to a correctly + * oriented destination rectangle of [0, 0, w, h]. + */ +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, w, 1, 0, 0, 0, 0, 1); + case kRightBottom_SkEncodedOrigin: return SkMatrix::MakeAll( 0, -1, w, -1, 0, h, 0, 0, 1); + case kLeftBottom_SkEncodedOrigin: return SkMatrix::MakeAll( 0, 1, 0, -1, 0, h, 0, 0, 1); + } + SK_ABORT("Unexpected origin"); +} + +/** + * Return true if the encoded origin includes a 90 degree rotation, in which case the width + * and height of the source data are swapped relative to a correctly oriented destination. + */ +static inline bool SkEncodedOriginSwapsWidthHeight(SkEncodedOrigin origin) { + return origin >= kLeftTop_SkEncodedOrigin; +} + +#endif // SkEncodedOrigin_DEFINED |