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+/*
+ * Small jpeg decoder library (Internal header)
+ *
+ * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the author nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+
+#ifndef __TINYJPEG_INTERNAL_H_
+#define __TINYJPEG_INTERNAL_H_
+
+struct jdec_private;
+
+#define HUFFMAN_HASH_NBITS 9
+#define HUFFMAN_HASH_SIZE (1UL<<HUFFMAN_HASH_NBITS)
+#define HUFFMAN_HASH_MASK (HUFFMAN_HASH_SIZE-1)
+
+#define HUFFMAN_TABLES 4
+#define COMPONENTS 4
+
+struct huffman_table
+{
+ /* Fast look up table, using HUFFMAN_HASH_NBITS bits we can have directly the symbol,
+ * if the symbol is <0, then we need to look into the tree table */
+ short int lookup[HUFFMAN_HASH_SIZE];
+ /* code size: give the number of bits of a symbol is encoded */
+ unsigned char code_size[HUFFMAN_HASH_SIZE];
+ /* some place to store value that is not encoded in the lookup table
+ * FIXME: Calculate if 256 value is enough to store all values
+ */
+ uint16_t slowtable[16-HUFFMAN_HASH_NBITS][256];
+};
+
+struct component
+{
+ unsigned int Hfactor;
+ unsigned int Vfactor;
+ float *Q_table; /* Pointer to the quantisation table to use */
+ struct huffman_table *AC_table;
+ struct huffman_table *DC_table;
+ short int previous_DC; /* Previous DC coefficient */
+ short int DCT[64]; /* DCT coef */
+};
+
+
+typedef void (*decode_MCU_fct) (struct jdec_private *priv);
+typedef void (*convert_colorspace_fct) (struct jdec_private *priv);
+
+struct jdec_private
+{
+ /* Public variables */
+ uint8_t *components[COMPONENTS];
+ unsigned int width, height; /* Size of the image */
+ unsigned int flags;
+
+ /* Private variables */
+ const unsigned char *stream_begin;
+ unsigned int stream_length;
+
+ const unsigned char *stream; /* Pointer to the current stream */
+ unsigned int reservoir, nbits_in_reservoir;
+
+ struct component component_infos[COMPONENTS];
+ float Q_tables[COMPONENTS][64]; /* quantization tables */
+ struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */
+ struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */
+ int default_huffman_table_initialized;
+
+ /* Temp space used after the IDCT to store each components */
+ uint8_t Y[64*4], Cr[64], Cb[64];
+
+ /* Internal Pointer use for colorspace conversion, do not modify it !!! */
+ uint8_t *plane[COMPONENTS];
+
+};
+
+#define IDCT jpeg_idct_float
+void jpeg_idct_float (struct component *compptr, uint8_t *output_buf, int stride);
+
+#endif
+