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Unified Diff: src/codec/SkMaskSwizzler.h

Issue 947283002: Bmp Image Decoding (Closed) Base URL: https://skia.googlesource.com/skia.git@decode-leon-3
Patch Set: Original change plus fix Created 5 years, 9 months ago
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Index: src/codec/SkMaskSwizzler.h
diff --git a/src/codec/SkMaskSwizzler.h b/src/codec/SkMaskSwizzler.h
new file mode 100644
index 0000000000000000000000000000000000000000..9351f0228ba2a771e418a768752ed71b1bbf750b
--- /dev/null
+++ b/src/codec/SkMaskSwizzler.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkMasks.h"
+#include "SkSwizzler.h"
+#include "SkTypes.h"
+
+/*
+ *
+ * Used to swizzle images whose pixel components are extracted by bit masks
+ * Currently only used by bmp
+ *
+ */
+class SkMaskSwizzler {
+public:
+
+ /*
+ *
+ * Create a new swizzler
+ * @param masks Unowned pointer to helper class
+ *
+ */
+ static SkMaskSwizzler* CreateMaskSwizzler(const SkImageInfo& imageInfo,
+ SkMasks* masks,
+ uint32_t bitsPerPixel);
+
+ /*
+ *
+ * Swizzle the next row
+ *
+ */
+ SkSwizzler::ResultAlpha next(void* dst, const uint8_t* src);
+
+private:
+
+ /*
+ *
+ * Row procedure used for swizzle
+ *
+ */
+ typedef SkSwizzler::ResultAlpha (*RowProc)(
+ void* dstRow, const uint8_t* srcRow, int width,
+ SkMasks* masks);
+
+ /*
+ *
+ * Constructor for mask swizzler
+ *
+ */
+ SkMaskSwizzler(const SkImageInfo& info, SkMasks* masks, RowProc proc);
+
+ // Fields
+ const SkImageInfo& fImageInfo;
+ SkMasks* fMasks; // unowned
+ const RowProc fRowProc;
+};
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