First version of blackmagic native dng support, #4285

rtengine/lj92.h

@@ -0,0 +1,68 @@
+/*
+lj92.h
+(c) Andrew Baldwin 2014
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#ifndef LJ92_H
+#define LJ92_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+enum LJ92_ERRORS {
+    LJ92_ERROR_NONE = 0,
+    LJ92_ERROR_CORRUPT = -1,
+    LJ92_ERROR_NO_MEMORY = -2,
+    LJ92_ERROR_BAD_HANDLE = -3,
+    LJ92_ERROR_TOO_WIDE = -4,
+};
+
+typedef struct _ljp* lj92;
+
+/* Parse a lossless JPEG (1992) structure returning
+ * - a handle that can be used to decode the data
+ * - width/height/bitdepth of the data
+ * Returns status code.
+ * If status == LJ92_ERROR_NONE, handle must be closed with lj92_close
+ */
+int lj92_open(lj92* lj, // Return handle here
+              uint8_t* data,int datalen, // The encoded data
+              int* width,int* height,int* bitdepth); // Width, height and bitdepth
+
+/* Release a decoder object */
+void lj92_close(lj92 lj);
+
+/*
+ * Decode previously opened lossless JPEG (1992) into a 2D tile of memory
+ * Starting at target, write writeLength 16bit values, then skip 16bit skipLength value before writing again
+ * If linearize is not NULL, use table at linearize to convert data values from output value to target value
+ * Data is only correct if LJ92_ERROR_NONE is returned
+ */
+int lj92_decode(lj92 lj,
+                uint16_t* target, int writeLength, int skipLength, // The image is written to target as a tile
+                uint16_t* linearize, int linearizeLength); // If not null, linearize the data using this table
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif