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Make IDCT method customizable

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Kornel
2017-12-23 01:29:16 +00:00
parent f154ccc091
commit 365bc1ce11
3 changed files with 27 additions and 0 deletions
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8
jpeglib.h
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@@ -514,6 +514,8 @@ struct jpeg_compress_struct {
int script_space_size;
};
typedef void (*jpeg_idct_method) (j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col);
typedef void (*jpeg_idct_method_selector) (j_decompress_ptr cinfo, jpeg_component_info *compptr, jpeg_idct_method * set_idct_method, int * set_idct_category);
/* Master record for a decompression instance */
@@ -1128,6 +1130,12 @@ EXTERN(void) jpeg_c_set_int_param (j_compress_ptr cinfo, J_INT_PARAM param,
int value);
EXTERN(int) jpeg_c_get_int_param (const j_compress_ptr cinfo, J_INT_PARAM param);
/*
* Permit users to replace the IDCT method dynamically.
* The selector callback is called after the default idct implementation was choosen,
* and is able to override it.
*/
EXTERN(void) jpeg_set_idct_method_selector (j_decompress_ptr cinfo, jpeg_idct_method_selector selector);
/* These marker codes are exported since applications and data source modules
* are likely to want to use them.