diff options
Diffstat (limited to 'jpeg/transupp.h')
| -rw-r--r-- | jpeg/transupp.h | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/jpeg/transupp.h b/jpeg/transupp.h index eee693141..a8ba16ad7 100644 --- a/jpeg/transupp.h +++ b/jpeg/transupp.h @@ -1,7 +1,7 @@ /* * transupp.h * - * Copyright (C) 1997-2013, Thomas G. Lane, Guido Vollbeding. + * Copyright (C) 1997-2019, Thomas G. Lane, Guido Vollbeding. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * @@ -61,6 +61,11 @@ * * A complementary lossless-wipe option is provided to discard (gray out) data * inside a given image region while losslessly preserving what is outside. + * Another option is lossless-drop, which replaces data at a given image + * position by another image. Both source images must have the same + * subsampling values. It is best if they also have the same quantization, + * otherwise quantization adaption occurs. The trim option can be used with + * the drop option to requantize the drop file to the source file. * * We also provide a lossless-resize option, which is kind of a lossless-crop * operation in the DCT coefficient block domain - it discards higher-order @@ -106,20 +111,22 @@ typedef enum { JXFORM_ROT_90, /* 90-degree clockwise rotation */ JXFORM_ROT_180, /* 180-degree rotation */ JXFORM_ROT_270, /* 270-degree clockwise (or 90 ccw) */ - JXFORM_WIPE /* wipe */ + JXFORM_WIPE, /* wipe */ + JXFORM_DROP /* drop */ } JXFORM_CODE; /* * Codes for crop parameters, which can individually be unspecified, * positive or negative for xoffset or yoffset, - * positive or forced for width or height. + * positive or force or reflect for width or height. */ typedef enum { - JCROP_UNSET, - JCROP_POS, - JCROP_NEG, - JCROP_FORCE + JCROP_UNSET, + JCROP_POS, + JCROP_NEG, + JCROP_FORCE, + JCROP_REFLECT } JCROP_CODE; /* @@ -134,20 +141,24 @@ typedef struct { boolean perfect; /* if TRUE, fail if partial MCUs are requested */ boolean trim; /* if TRUE, trim partial MCUs as needed */ boolean force_grayscale; /* if TRUE, convert color image to grayscale */ - boolean crop; /* if TRUE, crop or wipe source image */ + boolean crop; /* if TRUE, crop or wipe source image, or drop */ /* Crop parameters: application need not set these unless crop is TRUE. * These can be filled in by jtransform_parse_crop_spec(). */ JDIMENSION crop_width; /* Width of selected region */ - JCROP_CODE crop_width_set; /* (forced disables adjustment) */ + JCROP_CODE crop_width_set; /* (force disables adjustment) */ JDIMENSION crop_height; /* Height of selected region */ - JCROP_CODE crop_height_set; /* (forced disables adjustment) */ + JCROP_CODE crop_height_set; /* (force disables adjustment) */ JDIMENSION crop_xoffset; /* X offset of selected region */ JCROP_CODE crop_xoffset_set; /* (negative measures from right edge) */ JDIMENSION crop_yoffset; /* Y offset of selected region */ JCROP_CODE crop_yoffset_set; /* (negative measures from bottom edge) */ + /* Drop parameters: set by caller for drop request */ + j_decompress_ptr drop_ptr; + jvirt_barray_ptr * drop_coef_arrays; + /* Internal workspace: caller should not touch these */ int num_components; /* # of components in workspace */ jvirt_barray_ptr * workspace_coef_arrays; /* workspace for transformations */ |