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- /* Copyright (C) 1994 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* sjpeg.h */
- /* Definitions for Ghostscript's IJG library interface routines */
- /* Requires sdct.h, jpeg/jpeglib.h */
-
- /*
- * Each routine gs_jpeg_xxx is equivalent to the IJG entry point jpeg_xxx,
- * except that
- * (a) it takes a pointer to stream_DCT_state instead of just the IJG
- * jpeg_(de)compress_data struct;
- * (b) it catches any error exit from the IJG code and converts it into
- * an error return value per Ghostscript custom. A negative return
- * value is an error code, except for gs_jpeg_alloc_xxx which return
- * NULL (indicating e_VMerror).
- */
-
- /* Common to encode/decode */
-
- void gs_jpeg_error_setup (P1(stream_DCT_state *st));
- int gs_jpeg_log_error (P1(stream_DCT_state *st));
- JQUANT_TBL * gs_jpeg_alloc_quant_table (P1(stream_DCT_state *st));
- JHUFF_TBL * gs_jpeg_alloc_huff_table (P1(stream_DCT_state *st));
- int gs_jpeg_destroy (P1(stream_DCT_state *st));
-
- /* Encode */
-
- int gs_jpeg_create_compress (P1(stream_DCT_state *st));
- int gs_jpeg_set_defaults (P1(stream_DCT_state *st));
- int gs_jpeg_set_colorspace (P2(stream_DCT_state *st,
- J_COLOR_SPACE colorspace));
- int gs_jpeg_set_linear_quality (P3(stream_DCT_state *st,
- int scale_factor,
- boolean force_baseline));
- int gs_jpeg_set_quality (P3(stream_DCT_state *st,
- int quality,
- boolean force_baseline));
- int gs_jpeg_start_compress (P2(stream_DCT_state *st,
- boolean write_all_tables));
- int gs_jpeg_write_scanlines (P3(stream_DCT_state *st,
- JSAMPARRAY scanlines,
- int num_lines));
- int gs_jpeg_finish_compress (P1(stream_DCT_state *st));
-
- /* Decode */
-
- int gs_jpeg_create_decompress (P1(stream_DCT_state *st));
- int gs_jpeg_read_header (P2(stream_DCT_state *st,
- boolean require_image));
- int gs_jpeg_start_decompress (P1(stream_DCT_state *st));
- int gs_jpeg_read_scanlines (P3(stream_DCT_state *st,
- JSAMPARRAY scanlines,
- int max_lines));
- int gs_jpeg_finish_decompress (P1(stream_DCT_state *st));
-