Index: jdcoefct.h |
diff --git a/jdcoefct.h b/jdcoefct.h |
new file mode 100644 |
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+/* |
+ * jdcoefct.h |
+ * |
+ * This file was part of the Independent JPEG Group's software: |
+ * Copyright (C) 1994-1997, Thomas G. Lane. |
+ * libjpeg-turbo Modifications: |
+ * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
+ * For conditions of distribution and use, see the accompanying README file. |
+ */ |
+ |
+#define JPEG_INTERNALS |
+#include "jinclude.h" |
+#include "jpeglib.h" |
+ |
+ |
+/* Block smoothing is only applicable for progressive JPEG, so: */ |
+#ifndef D_PROGRESSIVE_SUPPORTED |
+#undef BLOCK_SMOOTHING_SUPPORTED |
+#endif |
+ |
+ |
+/* Private buffer controller object */ |
+ |
+typedef struct { |
+ struct jpeg_d_coef_controller pub; /* public fields */ |
+ |
+ /* These variables keep track of the current location of the input side. */ |
+ /* cinfo->input_iMCU_row is also used for this. */ |
+ JDIMENSION MCU_ctr; /* counts MCUs processed in current row */ |
+ int MCU_vert_offset; /* counts MCU rows within iMCU row */ |
+ int MCU_rows_per_iMCU_row; /* number of such rows needed */ |
+ |
+ /* The output side's location is represented by cinfo->output_iMCU_row. */ |
+ |
+ /* In single-pass modes, it's sufficient to buffer just one MCU. |
+ * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, |
+ * and let the entropy decoder write into that workspace each time. |
+ * In multi-pass modes, this array points to the current MCU's blocks |
+ * within the virtual arrays; it is used only by the input side. |
+ */ |
+ JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; |
+ |
+ /* Temporary workspace for one MCU */ |
+ JCOEF * workspace; |
+ |
+#ifdef D_MULTISCAN_FILES_SUPPORTED |
+ /* In multi-pass modes, we need a virtual block array for each component. */ |
+ jvirt_barray_ptr whole_image[MAX_COMPONENTS]; |
+#endif |
+ |
+#ifdef BLOCK_SMOOTHING_SUPPORTED |
+ /* When doing block smoothing, we latch coefficient Al values here */ |
+ int * coef_bits_latch; |
+#define SAVED_COEFS 6 /* we save coef_bits[0..5] */ |
+#endif |
+} my_coef_controller; |
+ |
+typedef my_coef_controller * my_coef_ptr; |
+ |
+ |
+LOCAL(void) |
+start_iMCU_row (j_decompress_ptr cinfo) |
+/* Reset within-iMCU-row counters for a new row (input side) */ |
+{ |
+ my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
+ |
+ /* In an interleaved scan, an MCU row is the same as an iMCU row. |
+ * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. |
+ * But at the bottom of the image, process only what's left. |
+ */ |
+ if (cinfo->comps_in_scan > 1) { |
+ coef->MCU_rows_per_iMCU_row = 1; |
+ } else { |
+ if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1)) |
+ coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; |
+ else |
+ coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; |
+ } |
+ |
+ coef->MCU_ctr = 0; |
+ coef->MCU_vert_offset = 0; |
+} |