diff options
Diffstat (limited to 'jpeglib.h')
| -rw-r--r-- | jpeglib.h | 65 |
1 files changed, 65 insertions, 0 deletions
@@ -633,6 +633,47 @@ struct jpeg_decompress_struct { struct jpeg_color_quantizer * cquantize; }; +typedef struct { + + // |--- byte_offset ---|- bit_left -| + // \------ 27 -------/ \---- 5 ----/ + unsigned int bitstream_offset; + short prev_dc[3]; +} huffman_offset_data; + +typedef struct { + + // The header starting position of this scan + unsigned int bitstream_offset; + + // Number of components in this scan + int comps_in_scan; + + // Number of MCUs in each row + int MCUs_per_row; + int MCU_rows_per_iMCU_row; + + huffman_offset_data **offset; +} huffman_scan_header; + +#define DEFAULT_MCU_SAMPLE_SIZE 16 + +typedef struct { + + // The number of MCUs that we sample each time as an index point + int MCU_sample_size; + + // Number of scan in this image + int scan_count; + + // Number of iMCUs rows in this image + int total_iMCU_rows; + + // Memory used by scan struct + size_t mem_used; + huffman_scan_header *scan; +} huffman_index; + /* "Object" declarations for JPEG modules that may be supplied or called * directly by the surrounding application. @@ -728,7 +769,9 @@ struct jpeg_destination_mgr { struct jpeg_source_mgr { const JOCTET * next_input_byte; /* => next byte to read from buffer */ + const JOCTET * start_input_byte; /* => first byte to read from input */ size_t bytes_in_buffer; /* # of bytes remaining in buffer */ + size_t total_byte; /* # of bytes in input */ JMETHOD(void, init_source, (j_decompress_ptr cinfo)); JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); @@ -980,6 +1023,19 @@ EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines)); +EXTERN(JDIMENSION) jpeg_read_scanlines_from JPP((j_decompress_ptr cinfo, + JSAMPARRAY scanlines, + int line_offset, + JDIMENSION max_lines)); +EXTERN(JDIMENSION) jpeg_read_tile_scanline JPP((j_decompress_ptr cinfo, + huffman_index *index, + JSAMPARRAY scanlines, + int start_x, int start_y, + int width, int height)); +EXTERN(void) jpeg_init_read_tile_scanline JPP((j_decompress_ptr cinfo, + huffman_index *index, + int *start_x, int *start_y, + int *width, int *height)); EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ @@ -1017,6 +1073,7 @@ EXTERN(void) jpeg_set_marker_processor /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); +EXTERN(boolean) jpeg_build_huffman_index JPP((j_decompress_ptr cinfo, huffman_index *index)); EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, @@ -1041,6 +1098,14 @@ EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, int desired)); +EXTERN(void) jpeg_configure_huffman_decoder(j_decompress_ptr cinfo, + unsigned int bitstream_offset, short int *dc_info); +EXTERN(void) jpeg_get_huffman_decoder_configuration(j_decompress_ptr cinfo, + unsigned int *bitstream_offset, short int *dc_info); +EXTERN(void) jpeg_create_huffman_index(j_decompress_ptr cinfo, + huffman_index *index); +EXTERN(void) jpeg_destroy_huffman_index(huffman_index *index); + /* These marker codes are exported since applications and data source modules * are likely to want to use them. |