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Unified Diff: src/codec/SkMasks.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/SkMasks.h
diff --git a/src/codec/SkMasks.h b/src/codec/SkMasks.h
new file mode 100644
index 0000000000000000000000000000000000000000..31c684994017f3c174439f0005dde46238180562
--- /dev/null
+++ b/src/codec/SkMasks.h
@@ -0,0 +1,81 @@
+/*
+ * 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 "SkTypes.h"
+
+/*
+ *
+ * Contains useful mask routines for SkMaskSwizzler
+ *
+ */
+class SkMasks {
+public:
+
+ /*
+ *
+ * Input bit masks format
+ *
+ */
+ struct InputMasks {
+ uint32_t red;
+ uint32_t green;
+ uint32_t blue;
+ uint32_t alpha;
+ };
+
+ /*
+ *
+ * Contains all of the information for a single mask
+ *
+ */
+ struct MaskInfo {
+ uint32_t mask;
+ uint32_t shift;
+ uint32_t size;
+ };
+
+ /*
+ *
+ * Create the masks object
+ *
+ */
+ static SkMasks* CreateMasks(InputMasks masks, uint32_t bpp);
+
+ /*
+ *
+ * Get a color component
+ *
+ */
+ uint8_t getRed(uint32_t pixel);
+ uint8_t getGreen(uint32_t pixel);
+ uint8_t getBlue(uint32_t pixel);
+ uint8_t getAlpha(uint32_t pixel);
+
+ /*
+ *
+ * Getter for the alpha mask
+ * The alpha mask may be used in other decoding modes
+ *
+ */
+ uint32_t getAlphaMask() {
+ return fAlpha.mask;
+ }
+
+private:
+
+ /*
+ *
+ * Constrcutor
+ *
+ */
+ SkMasks(const MaskInfo red, const MaskInfo green, const MaskInfo blue,
+ const MaskInfo alpha);
+
+ const MaskInfo fRed;
+ const MaskInfo fGreen;
+ const MaskInfo fBlue;
+ const MaskInfo fAlpha;
+};
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