| /* |
| * jdsample.h |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1991-1996, Thomas G. Lane. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * file. |
| */ |
| |
| #define JPEG_INTERNALS |
| #include "jpeglib.h" |
| |
| |
| /* Pointer to routine to upsample a single component */ |
| typedef void (*upsample1_ptr) (j_decompress_ptr cinfo, |
| jpeg_component_info *compptr, |
| JSAMPARRAY input_data, |
| JSAMPARRAY *output_data_ptr); |
| |
| /* Private subobject */ |
| |
| typedef struct { |
| struct jpeg_upsampler pub; /* public fields */ |
| |
| /* Color conversion buffer. When using separate upsampling and color |
| * conversion steps, this buffer holds one upsampled row group until it |
| * has been color converted and output. |
| * Note: we do not allocate any storage for component(s) which are full-size, |
| * ie do not need rescaling. The corresponding entry of color_buf[] is |
| * simply set to point to the input data array, thereby avoiding copying. |
| */ |
| JSAMPARRAY color_buf[MAX_COMPONENTS]; |
| |
| /* Per-component upsampling method pointers */ |
| upsample1_ptr methods[MAX_COMPONENTS]; |
| |
| int next_row_out; /* counts rows emitted from color_buf */ |
| JDIMENSION rows_to_go; /* counts rows remaining in image */ |
| |
| /* Height of an input row group for each component. */ |
| int rowgroup_height[MAX_COMPONENTS]; |
| |
| /* These arrays save pixel expansion factors so that int_expand need not |
| * recompute them each time. They are unused for other upsampling methods. |
| */ |
| UINT8 h_expand[MAX_COMPONENTS]; |
| UINT8 v_expand[MAX_COMPONENTS]; |
| } my_upsampler; |
| |
| typedef my_upsampler *my_upsample_ptr; |
