Add skia to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@16 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 70 insertions, 0 deletions

diff --git a/skia/include/SkPackBits.h b/skia/include/SkPackBits.h
new file mode 100644
index 0000000..4bbfb55
--- /dev/null
+++ b/skia/include/SkPackBits.h
@@ -0,0 +1,70 @@
+#ifndef SkPackBits_DEFINED
+#define SkPackBits_DEFINED
+
+#include "SkTypes.h"
+
+class SkPackBits {
+public:
+    /** Given the number of 16bit values that will be passed to Pack16,
+        returns the worst-case size needed for the dst[] buffer.
+    */
+    static size_t ComputeMaxSize16(int count);
+
+    /** Given the number of 8bit values that will be passed to Pack8,
+        returns the worst-case size needed for the dst[] buffer.
+    */
+    static size_t ComputeMaxSize8(int count);
+
+    /** Write the src array into a packed format. The packing process may end
+        up writing more bytes than it read, so dst[] must be large enough.
+        @param src      Input array of 16bit values
+        @param count    Number of entries in src[]
+        @param dst      Buffer (allocated by caller) to write the packed data
+                        into
+        @return the number of bytes written to dst[]
+    */
+    static size_t Pack16(const uint16_t src[], int count, uint8_t dst[]);
+
+    /** Write the src array into a packed format. The packing process may end
+        up writing more bytes than it read, so dst[] must be large enough.
+        @param src      Input array of 8bit values
+        @param count    Number of entries in src[]
+        @param dst      Buffer (allocated by caller) to write the packed data
+                        into
+        @return the number of bytes written to dst[]
+    */
+    static size_t Pack8(const uint8_t src[], int count, uint8_t dst[]);
+
+    /** Unpack the data in src[], and expand it into dst[]. The src[] data was
+        written by a previous call to Pack16.
+        @param src  Input data to unpack, previously created by Pack16.
+        @param srcSize  Number of bytes of src to unpack
+        @param dst  Buffer (allocated by caller) to expand the src[] into.
+        @return the number of dst elements (not bytes) written into dst.
+    */
+    static int Unpack16(const uint8_t src[], size_t srcSize, uint16_t dst[]);
+
+    /** Unpack the data in src[], and expand it into dst[]. The src[] data was
+        written by a previous call to Pack8.
+        @param src      Input data to unpack, previously created by Pack8.
+        @param srcSize  Number of bytes of src to unpack
+        @param dst      Buffer (allocated by caller) to expand the src[] into.
+        @return the number of bytes written into dst.
+    */
+    static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[]);
+
+    /** Unpack the data from src[], skip the first dstSkip bytes, then write
+        dstWrite bytes into dst[]. The src[] data was written by a previous
+        call to Pack8. Return the number of bytes actually writtten into dst[]
+        @param src      Input data to unpack, previously created by Pack8.
+        @param dst      Buffer (allocated by caller) to expand the src[] into.
+        @param dstSkip  Number of bytes of unpacked src to skip before writing
+                        into dst
+        @param dstWrite Number of bytes of unpacked src to write into dst (after
+                        skipping dstSkip bytes)
+    */
+    static void Unpack8(uint8_t dst[], size_t dstSkip, size_t dstWrite,
+                        const uint8_t src[]);
+};
+
+#endif