1 files changed, 76 insertions, 0 deletions
diff --git a/gfx/skia/skia/src/codec/SkMaskSwizzler.h b/gfx/skia/skia/src/codec/SkMaskSwizzler.h
new file mode 100644
index 0000000000..4cac41905c
--- /dev/null
+++ b/gfx/skia/skia/src/codec/SkMaskSwizzler.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkMaskSwizzler_DEFINED
+#define SkMaskSwizzler_DEFINED
+
+#include "include/codec/SkCodec.h"
+#include "include/core/SkTypes.h"
+#include "src/codec/SkSampler.h"
+
+#include <cstdint>
+
+class SkMasks;
+struct SkImageInfo;
+
+/*
+ *
+ * Used to swizzle images whose pixel components are extracted by bit masks
+ * Currently only used by bmp
+ *
+ */
+class SkMaskSwizzler : public SkSampler {
+public:
+
+    /*
+     * @param masks Unowned pointer to helper class
+     */
+    static SkMaskSwizzler* CreateMaskSwizzler(const SkImageInfo& dstInfo,
+                                              bool srcIsOpaque,
+                                              SkMasks* masks,
+                                              uint32_t bitsPerPixel,
+                                              const SkCodec::Options& options);
+
+    /*
+     * Swizzle a row
+     */
+    void swizzle(void* dst, const uint8_t* SK_RESTRICT src);
+
+    int fillWidth() const override {
+        return fDstWidth;
+    }
+
+    /**
+     *  Returns the byte offset at which we write to destination memory, taking
+     *  scaling, subsetting, and partial frames into account.
+     *  A similar function exists on SkSwizzler.
+     */
+    int swizzleWidth() const { return fDstWidth; }
+
+private:
+
+    /*
+     * Row procedure used for swizzle
+     */
+    typedef void (*RowProc)(void* dstRow, const uint8_t* srcRow, int width,
+            SkMasks* masks, uint32_t startX, uint32_t sampleX);
+
+    SkMaskSwizzler(SkMasks* masks, RowProc proc, int subsetWidth, int srcOffset);
+
+    int onSetSampleX(int) override;
+
+    SkMasks*        fMasks;           // unowned
+    const RowProc   fRowProc;
+
+    // FIXME: Can this class share more with SkSwizzler? These variables are all the same.
+    const int       fSubsetWidth;     // Width of the subset of source before any sampling.
+    int             fDstWidth;        // Width of dst, which may differ with sampling.
+    int             fSampleX;
+    int             fSrcOffset;
+    int             fX0;
+};
+
+#endif