skia WIPjarred/canvas

1 files changed, 54 insertions, 0 deletions

diff --git a/src/deps/skia/include/codec/SkEncodedOrigin.h b/src/deps/skia/include/codec/SkEncodedOrigin.h
new file mode 100644
index 000000000..19d083672
--- /dev/null
+++ b/src/deps/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