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<html><head><title>dlib C++ Library - jdmainct.c</title></head><body bgcolor='white'><pre> |
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<font color='#009900'>/*
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* jdmainct.c
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*
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* Copyright (C) 1994-1996, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains the main buffer controller for decompression.
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* The main buffer lies between the JPEG decompressor proper and the
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* post-processor; it holds downsampled data in the JPEG colorspace.
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*
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* Note that this code is bypassed in raw-data mode, since the application
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* supplies the equivalent of the main buffer in that case.
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*/</font>
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<font color='#0000FF'>#define</font> JPEG_INTERNALS
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jinclude.h.html'>jinclude.h</a>"
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<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='jpeglib.h.html'>jpeglib.h</a>"
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<font color='#009900'>/*
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* In the current system design, the main buffer need never be a full-image
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* buffer; any full-height buffers will be found inside the coefficient or
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* postprocessing controllers. Nonetheless, the main controller is not
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* trivial. Its responsibility is to provide context rows for upsampling/
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* rescaling, and doing this in an efficient fashion is a bit tricky.
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*
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* Postprocessor input data is counted in "row groups". A row group
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* is defined to be (v_samp_factor * DCT_scaled_size / min_DCT_scaled_size)
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* sample rows of each component. (We require DCT_scaled_size values to be
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* chosen such that these numbers are integers. In practice DCT_scaled_size
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* values will likely be powers of two, so we actually have the stronger
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* condition that DCT_scaled_size / min_DCT_scaled_size is an integer.)
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* Upsampling will typically produce max_v_samp_factor pixel rows from each
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* row group (times any additional scale factor that the upsampler is
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* applying).
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*
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* The coefficient controller will deliver data to us one iMCU row at a time;
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* each iMCU row contains v_samp_factor * DCT_scaled_size sample rows, or
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* exactly min_DCT_scaled_size row groups. (This amount of data corresponds
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* to one row of MCUs when the image is fully interleaved.) Note that the
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* number of sample rows varies across components, but the number of row
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* groups does not. Some garbage sample rows may be included in the last iMCU
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* row at the bottom of the image.
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*
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* Depending on the vertical scaling algorithm used, the upsampler may need
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* access to the sample row(s) above and below its current input row group.
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* The upsampler is required to set need_context_rows TRUE at global selection
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* time if so. When need_context_rows is FALSE, this controller can simply
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* obtain one iMCU row at a time from the coefficient controller and dole it
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* out as row groups to the postprocessor.
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*
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* When need_context_rows is TRUE, this controller guarantees that the buffer
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* passed to postprocessing contains at least one row group's worth of samples
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* above and below the row group(s) being processed. Note that the context
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* rows "above" the first passed row group appear at negative row offsets in
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* the passed buffer. At the top and bottom of the image, the required
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* context rows are manufactured by duplicating the first or last real sample
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* row; this avoids having special cases in the upsampling inner loops.
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*
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* The amount of context is fixed at one row group just because that's a
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* convenient number for this controller to work with. The existing
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* upsamplers really only need one sample row of context. An upsampler
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* supporting arbitrary output rescaling might wish for more than one row
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* group of context when shrinking the image; tough, we don't handle that.
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* (This is justified by the assumption that downsizing will be handled mostly
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* by adjusting the DCT_scaled_size values, so that the actual scale factor at
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* the upsample step needn't be much less than one.)
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*
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* To provide the desired context, we have to retain the last two row groups
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* of one iMCU row while reading in the next iMCU row. (The last row group
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* can't be processed until we have another row group for its below-context,
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* and so we have to save the next-to-last group too for its above-context.)
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* We could do this most simply by copying data around in our buffer, but
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* that'd be very slow. We can avoid copying any data by creating a rather
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* strange pointer structure. Here's how it works. We allocate a workspace
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* consisting of M+2 row groups (where M = min_DCT_scaled_size is the number
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* of row groups per iMCU row). We create two sets of redundant pointers to
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* the workspace. Labeling the physical row groups 0 to M+1, the synthesized
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* pointer lists look like this:
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* M+1 M-1
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* master pointer --> 0 master pointer --> 0
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* 1 1
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* ... ...
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* M-3 M-3
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* M-2 M
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* M-1 M+1
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* M M-2
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* M+1 M-1
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* 0 0
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* We read alternate iMCU rows using each master pointer; thus the last two
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* row groups of the previous iMCU row remain un-overwritten in the workspace.
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* The pointer lists are set up so that the required context rows appear to
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* be adjacent to the proper places when we pass the pointer lists to the
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* upsampler.
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*
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* The above pictures describe the normal state of the pointer lists.
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* At top and bottom of the image, we diddle the pointer lists to duplicate
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* the first or last sample row as necessary (this is cheaper than copying
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* sample rows around).
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*
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* This scheme breaks down if M < 2, ie, min_DCT_scaled_size is 1. In that
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* situation each iMCU row provides only one row group so the buffering logic
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* must be different (eg, we must read two iMCU rows before we can emit the
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* first row group). For now, we simply do not support providing context
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* rows when min_DCT_scaled_size is 1. That combination seems unlikely to
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* be worth providing --- if someone wants a 1/8th-size preview, they probably
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* want it quick and dirty, so a context-free upsampler is sufficient.
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*/</font>
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<font color='#009900'>/* Private buffer controller object */</font>
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<font color='#0000FF'>typedef</font> <font color='#0000FF'>struct</font> <b>{</b>
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<font color='#0000FF'>struct</font> jpeg_d_main_controller pub; <font color='#009900'>/* public fields */</font>
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<font color='#009900'>/* Pointer to allocated workspace (M or M+2 row groups). */</font>
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JSAMPARRAY buffer[MAX_COMPONENTS];
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boolean buffer_full; <font color='#009900'>/* Have we gotten an iMCU row from decoder? */</font>
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JDIMENSION rowgroup_ctr; <font color='#009900'>/* counts row groups output to postprocessor */</font>
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<font color='#009900'>/* Remaining fields are only used in the context case. */</font>
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<font color='#009900'>/* These are the master pointers to the funny-order pointer lists. */</font>
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JSAMPIMAGE xbuffer[<font color='#979000'>2</font>]; <font color='#009900'>/* pointers to weird pointer lists */</font>
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<font color='#0000FF'><u>int</u></font> whichptr; <font color='#009900'>/* indicates which pointer set is now in use */</font>
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<font color='#0000FF'><u>int</u></font> context_state; <font color='#009900'>/* process_data state machine status */</font>
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JDIMENSION rowgroups_avail; <font color='#009900'>/* row groups available to postprocessor */</font>
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JDIMENSION iMCU_row_ctr; <font color='#009900'>/* counts iMCU rows to detect image top/bot */</font>
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<b>}</b> my_main_controller;
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<font color='#0000FF'>typedef</font> my_main_controller <font color='#5555FF'>*</font> my_main_ptr;
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<font color='#009900'>/* context_state values: */</font>
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<font color='#0000FF'>#define</font> CTX_PREPARE_FOR_IMCU <font color='#979000'>0</font> <font color='#009900'>/* need to prepare for MCU row */</font>
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<font color='#0000FF'>#define</font> CTX_PROCESS_IMCU <font color='#979000'>1</font> <font color='#009900'>/* feeding iMCU to postprocessor */</font>
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<font color='#0000FF'>#define</font> CTX_POSTPONED_ROW <font color='#979000'>2</font> <font color='#009900'>/* feeding postponed row group */</font>
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<font color='#009900'>/* Forward declarations */</font>
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> process_data_simple_main
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<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, JSAMPARRAY output_buf,
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JDIMENSION <font color='#5555FF'>*</font>out_row_ctr, JDIMENSION out_rows_avail<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> process_data_context_main
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<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, JSAMPARRAY output_buf,
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JDIMENSION <font color='#5555FF'>*</font>out_row_ctr, JDIMENSION out_rows_avail<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>#ifdef</font> QUANT_2PASS_SUPPORTED
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<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font> process_data_crank_post
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<b><a name='JPP'></a>JPP</b><font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_decompress_ptr cinfo, JSAMPARRAY output_buf,
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JDIMENSION <font color='#5555FF'>*</font>out_row_ctr, JDIMENSION out_rows_avail<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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<font color='#0000FF'>#endif</font>
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<b><a name='LOCAL'></a>LOCAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='alloc_funny_pointers'></a>alloc_funny_pointers</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<font color='#009900'>/* Allocate space for the funny pointer lists.
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* This is done only once, not once per pass.
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*/</font>
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<b>{</b>
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my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
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<font color='#0000FF'><u>int</u></font> ci, rgroup;
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<font color='#0000FF'><u>int</u></font> M <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size;
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jpeg_component_info <font color='#5555FF'>*</font>compptr;
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JSAMPARRAY xbuf;
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<font color='#009900'>/* Get top-level space for component array pointers.
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* We alloc both arrays with one call to save a few cycles.
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*/</font>
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main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>0</font>] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JSAMPIMAGE<font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components <font color='#5555FF'>*</font> <font color='#979000'>2</font> <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JSAMPARRAY<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>1</font>] <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>0</font>] <font color='#5555FF'>+</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
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ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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rgroup <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font> <font color='#5555FF'>/</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size; <font color='#009900'>/* height of a row group of component */</font>
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<font color='#009900'>/* Get space for pointer lists --- M+4 row groups in each list.
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* We alloc both pointer lists with one call to save a few cycles.
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*/</font>
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xbuf <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JSAMPARRAY<font face='Lucida Console'>)</font>
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<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
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<font color='#979000'>2</font> <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font>rgroup <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font>M <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font> <font color='#5555FF'>*</font> <font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>JSAMPROW<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
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xbuf <font color='#5555FF'>+</font><font color='#5555FF'>=</font> rgroup; <font color='#009900'>/* want one row group at negative offsets */</font>
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main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>0</font>][ci] <font color='#5555FF'>=</font> xbuf;
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xbuf <font color='#5555FF'>+</font><font color='#5555FF'>=</font> rgroup <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font>M <font color='#5555FF'>+</font> <font color='#979000'>4</font><font face='Lucida Console'>)</font>;
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main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>1</font>][ci] <font color='#5555FF'>=</font> xbuf;
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<b>}</b>
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<b>}</b>
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<b><a name='LOCAL'></a>LOCAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
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<b><a name='make_funny_pointers'></a>make_funny_pointers</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
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<font color='#009900'>/* Create the funny pointer lists discussed in the comments above.
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* The actual workspace is already allocated (in main->buffer),
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* and the space for the pointer lists is allocated too.
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* This routine just fills in the curiously ordered lists.
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* This will be repeated at the beginning of each pass.
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*/</font>
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<b>{</b>
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my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
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<font color='#0000FF'><u>int</u></font> ci, i, rgroup;
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<font color='#0000FF'><u>int</u></font> M <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size;
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jpeg_component_info <font color='#5555FF'>*</font>compptr;
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JSAMPARRAY buf, xbuf0, xbuf1;
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
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ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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rgroup <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font> <font color='#5555FF'>/</font>
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cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size; <font color='#009900'>/* height of a row group of component */</font>
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xbuf0 <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>0</font>][ci];
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xbuf1 <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>1</font>][ci];
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<font color='#009900'>/* First copy the workspace pointers as-is */</font>
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buf <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer[ci];
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> rgroup <font color='#5555FF'>*</font> <font face='Lucida Console'>(</font>M <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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xbuf0[i] <font color='#5555FF'>=</font> xbuf1[i] <font color='#5555FF'>=</font> buf[i];
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<b>}</b>
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<font color='#009900'>/* In the second list, put the last four row groups in swapped order */</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> rgroup <font color='#5555FF'>*</font> <font color='#979000'>2</font>; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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xbuf1[rgroup<font color='#5555FF'>*</font><font face='Lucida Console'>(</font>M<font color='#5555FF'>-</font><font color='#979000'>2</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> i] <font color='#5555FF'>=</font> buf[rgroup<font color='#5555FF'>*</font>M <font color='#5555FF'>+</font> i];
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xbuf1[rgroup<font color='#5555FF'>*</font>M <font color='#5555FF'>+</font> i] <font color='#5555FF'>=</font> buf[rgroup<font color='#5555FF'>*</font><font face='Lucida Console'>(</font>M<font color='#5555FF'>-</font><font color='#979000'>2</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> i];
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<b>}</b>
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<font color='#009900'>/* The wraparound pointers at top and bottom will be filled later
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* (see set_wraparound_pointers, below). Initially we want the "above"
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* pointers to duplicate the first actual data line. This only needs
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* to happen in xbuffer[0].
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*/</font>
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<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> rgroup; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
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xbuf0[i <font color='#5555FF'>-</font> rgroup] <font color='#5555FF'>=</font> xbuf0[<font color='#979000'>0</font>];
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<b>}</b>
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|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<b><a name='LOCAL'></a>LOCAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='set_wraparound_pointers'></a>set_wraparound_pointers</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
|
|
<font color='#009900'>/* Set up the "wraparound" pointers at top and bottom of the pointer lists.
|
|
* This changes the pointer list state from top-of-image to the normal state.
|
|
*/</font>
|
|
<b>{</b>
|
|
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
|
|
<font color='#0000FF'><u>int</u></font> ci, i, rgroup;
|
|
<font color='#0000FF'><u>int</u></font> M <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size;
|
|
jpeg_component_info <font color='#5555FF'>*</font>compptr;
|
|
JSAMPARRAY xbuf0, xbuf1;
|
|
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
|
|
ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
rgroup <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font> <font color='#5555FF'>/</font>
|
|
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size; <font color='#009900'>/* height of a row group of component */</font>
|
|
xbuf0 <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>0</font>][ci];
|
|
xbuf1 <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[<font color='#979000'>1</font>][ci];
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> rgroup; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
xbuf0[i <font color='#5555FF'>-</font> rgroup] <font color='#5555FF'>=</font> xbuf0[rgroup<font color='#5555FF'>*</font><font face='Lucida Console'>(</font>M<font color='#5555FF'>+</font><font color='#979000'>1</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> i];
|
|
xbuf1[i <font color='#5555FF'>-</font> rgroup] <font color='#5555FF'>=</font> xbuf1[rgroup<font color='#5555FF'>*</font><font face='Lucida Console'>(</font>M<font color='#5555FF'>+</font><font color='#979000'>1</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> i];
|
|
xbuf0[rgroup<font color='#5555FF'>*</font><font face='Lucida Console'>(</font>M<font color='#5555FF'>+</font><font color='#979000'>2</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> i] <font color='#5555FF'>=</font> xbuf0[i];
|
|
xbuf1[rgroup<font color='#5555FF'>*</font><font face='Lucida Console'>(</font>M<font color='#5555FF'>+</font><font color='#979000'>2</font><font face='Lucida Console'>)</font> <font color='#5555FF'>+</font> i] <font color='#5555FF'>=</font> xbuf1[i];
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<b><a name='LOCAL'></a>LOCAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='set_bottom_pointers'></a>set_bottom_pointers</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo<font face='Lucida Console'>)</font>
|
|
<font color='#009900'>/* Change the pointer lists to duplicate the last sample row at the bottom
|
|
* of the image. whichptr indicates which xbuffer holds the final iMCU row.
|
|
* Also sets rowgroups_avail to indicate number of nondummy row groups in row.
|
|
*/</font>
|
|
<b>{</b>
|
|
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
|
|
<font color='#0000FF'><u>int</u></font> ci, i, rgroup, iMCUheight, rows_left;
|
|
jpeg_component_info <font color='#5555FF'>*</font>compptr;
|
|
JSAMPARRAY xbuf;
|
|
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
|
|
ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#009900'>/* Count sample rows in one iMCU row and in one row group */</font>
|
|
iMCUheight <font color='#5555FF'>=</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size;
|
|
rgroup <font color='#5555FF'>=</font> iMCUheight <font color='#5555FF'>/</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size;
|
|
<font color='#009900'>/* Count nondummy sample rows remaining for this component */</font>
|
|
rows_left <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'><u>int</u></font><font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>downsampled_height <font color='#5555FF'>%</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> iMCUheight<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>rows_left <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> rows_left <font color='#5555FF'>=</font> iMCUheight;
|
|
<font color='#009900'>/* Count nondummy row groups. Should get same answer for each component,
|
|
* so we need only do it once.
|
|
*/</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>0</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>rows_left<font color='#5555FF'>-</font><font color='#979000'>1</font><font face='Lucida Console'>)</font> <font color='#5555FF'>/</font> rgroup <font color='#5555FF'>+</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
<font color='#009900'>/* Duplicate the last real sample row rgroup*2 times; this pads out the
|
|
* last partial rowgroup and ensures at least one full rowgroup of context.
|
|
*/</font>
|
|
xbuf <font color='#5555FF'>=</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whichptr][ci];
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>i <font color='#5555FF'>=</font> <font color='#979000'>0</font>; i <font color='#5555FF'><</font> rgroup <font color='#5555FF'>*</font> <font color='#979000'>2</font>; i<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
xbuf[rows_left <font color='#5555FF'>+</font> i] <font color='#5555FF'>=</font> xbuf[rows_left<font color='#5555FF'>-</font><font color='#979000'>1</font>];
|
|
<b>}</b>
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Initialize for a processing pass.
|
|
*/</font>
|
|
|
|
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='start_pass_main'></a>start_pass_main</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo, J_BUF_MODE pass_mode<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
|
|
|
|
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>pass_mode<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>case</font> JBUF_PASS_THRU:
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>upsample<font color='#5555FF'>-</font><font color='#5555FF'>></font>need_context_rows<font face='Lucida Console'>)</font> <b>{</b>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.process_data <font color='#5555FF'>=</font> process_data_context_main;
|
|
<font color='#BB00BB'>make_funny_pointers</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>; <font color='#009900'>/* Create the xbuffer[] lists */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whichptr <font color='#5555FF'>=</font> <font color='#979000'>0</font>; <font color='#009900'>/* Read first iMCU row into xbuffer[0] */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>context_state <font color='#5555FF'>=</font> CTX_PREPARE_FOR_IMCU;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
|
|
<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
|
|
<font color='#009900'>/* Simple case with no context needed */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.process_data <font color='#5555FF'>=</font> process_data_simple_main;
|
|
<b>}</b>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full <font color='#5555FF'>=</font> FALSE; <font color='#009900'>/* Mark buffer empty */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#ifdef</font> QUANT_2PASS_SUPPORTED
|
|
<font color='#0000FF'>case</font> JBUF_CRANK_DEST:
|
|
<font color='#009900'>/* For last pass of 2-pass quantization, just crank the postprocessor */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.process_data <font color='#5555FF'>=</font> process_data_crank_post;
|
|
<font color='#0000FF'>break</font>;
|
|
<font color='#0000FF'>#endif</font>
|
|
<font color='#0000FF'>default</font>:
|
|
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>break</font>;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Process some data.
|
|
* This handles the simple case where no context is required.
|
|
*/</font>
|
|
|
|
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='process_data_simple_main'></a>process_data_simple_main</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo,
|
|
JSAMPARRAY output_buf, JDIMENSION <font color='#5555FF'>*</font>out_row_ctr,
|
|
JDIMENSION out_rows_avail<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
|
|
JDIMENSION rowgroups_avail;
|
|
|
|
<font color='#009900'>/* Read input data if we haven't filled the main buffer yet */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>decompress_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
|
|
<font color='#0000FF'>return</font>; <font color='#009900'>/* suspension forced, can do nothing more */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full <font color='#5555FF'>=</font> TRUE; <font color='#009900'>/* OK, we have an iMCU row to work with */</font>
|
|
<b>}</b>
|
|
|
|
<font color='#009900'>/* There are always min_DCT_scaled_size row groups in an iMCU row. */</font>
|
|
rowgroups_avail <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size;
|
|
<font color='#009900'>/* Note: at the bottom of the image, we may pass extra garbage row groups
|
|
* to the postprocessor. The postprocessor has to check for bottom
|
|
* of image anyway (at row resolution), so no point in us doing it too.
|
|
*/</font>
|
|
|
|
<font color='#009900'>/* Feed the postprocessor */</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>post<font color='#5555FF'>-</font><font color='#5555FF'>></font>post_process_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer,
|
|
<font color='#5555FF'>&</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr, rowgroups_avail,
|
|
output_buf, out_row_ctr, out_rows_avail<font face='Lucida Console'>)</font>;
|
|
|
|
<font color='#009900'>/* Has postprocessor consumed all the data yet? If so, mark buffer empty */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>></font><font color='#5555FF'>=</font> rowgroups_avail<font face='Lucida Console'>)</font> <b>{</b>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full <font color='#5555FF'>=</font> FALSE;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Process some data.
|
|
* This handles the case where context rows must be provided.
|
|
*/</font>
|
|
|
|
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='process_data_context_main'></a>process_data_context_main</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo,
|
|
JSAMPARRAY output_buf, JDIMENSION <font color='#5555FF'>*</font>out_row_ctr,
|
|
JDIMENSION out_rows_avail<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_main_ptr main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main;
|
|
|
|
<font color='#009900'>/* Read input data if we haven't filled the main buffer yet */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>!</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>coef<font color='#5555FF'>-</font><font color='#5555FF'>></font>decompress_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo,
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whichptr]<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>
|
|
<font color='#0000FF'>return</font>; <font color='#009900'>/* suspension forced, can do nothing more */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full <font color='#5555FF'>=</font> TRUE; <font color='#009900'>/* OK, we have an iMCU row to work with */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_ctr<font color='#5555FF'>+</font><font color='#5555FF'>+</font>; <font color='#009900'>/* count rows received */</font>
|
|
<b>}</b>
|
|
|
|
<font color='#009900'>/* Postprocessor typically will not swallow all the input data it is handed
|
|
* in one call (due to filling the output buffer first). Must be prepared
|
|
* to exit and restart. This switch lets us keep track of how far we got.
|
|
* Note that each case falls through to the next on successful completion.
|
|
*/</font>
|
|
<font color='#0000FF'>switch</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>context_state<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>case</font> CTX_POSTPONED_ROW:
|
|
<font color='#009900'>/* Call postprocessor using previously set pointers for postponed row */</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>post<font color='#5555FF'>-</font><font color='#5555FF'>></font>post_process_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whichptr],
|
|
<font color='#5555FF'>&</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail,
|
|
output_buf, out_row_ctr, out_rows_avail<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'><</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail<font face='Lucida Console'>)</font>
|
|
<font color='#0000FF'>return</font>; <font color='#009900'>/* Need to suspend */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>context_state <font color='#5555FF'>=</font> CTX_PREPARE_FOR_IMCU;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>out_row_ctr <font color='#5555FF'>></font><font color='#5555FF'>=</font> out_rows_avail<font face='Lucida Console'>)</font>
|
|
<font color='#0000FF'>return</font>; <font color='#009900'>/* Postprocessor exactly filled output buf */</font>
|
|
<font color='#009900'>/*FALLTHROUGH*/</font>
|
|
<font color='#0000FF'>case</font> CTX_PREPARE_FOR_IMCU:
|
|
<font color='#009900'>/* Prepare to process first M-1 row groups of this iMCU row */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font color='#979000'>0</font>;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size <font color='#5555FF'>-</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>;
|
|
<font color='#009900'>/* Check for bottom of image: if so, tweak pointers to "duplicate"
|
|
* the last sample row, and adjust rowgroups_avail to ignore padding rows.
|
|
*/</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_ctr <font color='#5555FF'>=</font><font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>total_iMCU_rows<font face='Lucida Console'>)</font>
|
|
<font color='#BB00BB'>set_bottom_pointers</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>context_state <font color='#5555FF'>=</font> CTX_PROCESS_IMCU;
|
|
<font color='#009900'>/*FALLTHROUGH*/</font>
|
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<font color='#0000FF'>case</font> CTX_PROCESS_IMCU:
|
|
<font color='#009900'>/* Call postprocessor using previously set pointers */</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>post<font color='#5555FF'>-</font><font color='#5555FF'>></font>post_process_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>xbuffer[main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whichptr],
|
|
<font color='#5555FF'>&</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr, main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail,
|
|
output_buf, out_row_ctr, out_rows_avail<font face='Lucida Console'>)</font>;
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'><</font> main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail<font face='Lucida Console'>)</font>
|
|
<font color='#0000FF'>return</font>; <font color='#009900'>/* Need to suspend */</font>
|
|
<font color='#009900'>/* After the first iMCU, change wraparound pointers to normal state */</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>main<font color='#5555FF'>-</font><font color='#5555FF'>></font>iMCU_row_ctr <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>
|
|
<font color='#BB00BB'>set_wraparound_pointers</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>;
|
|
<font color='#009900'>/* Prepare to load new iMCU row using other xbuffer list */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>whichptr ^<font color='#5555FF'>=</font> <font color='#979000'>1</font>; <font color='#009900'>/* 0=>1 or 1=>0 */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer_full <font color='#5555FF'>=</font> FALSE;
|
|
<font color='#009900'>/* Still need to process last row group of this iMCU row, */</font>
|
|
<font color='#009900'>/* which is saved at index M+1 of the other xbuffer */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroup_ctr <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size <font color='#5555FF'>+</font> <font color='#979000'>1</font><font face='Lucida Console'>)</font>;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>rowgroups_avail <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size <font color='#5555FF'>+</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font>;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>context_state <font color='#5555FF'>=</font> CTX_POSTPONED_ROW;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Process some data.
|
|
* Final pass of two-pass quantization: just call the postprocessor.
|
|
* Source data will be the postprocessor controller's internal buffer.
|
|
*/</font>
|
|
|
|
<font color='#0000FF'>#ifdef</font> QUANT_2PASS_SUPPORTED
|
|
|
|
<b><a name='METHODDEF'></a>METHODDEF</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='process_data_crank_post'></a>process_data_crank_post</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo,
|
|
JSAMPARRAY output_buf, JDIMENSION <font color='#5555FF'>*</font>out_row_ctr,
|
|
JDIMENSION out_rows_avail<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>post<font color='#5555FF'>-</font><font color='#5555FF'>></font>post_process_data<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>cinfo, <font face='Lucida Console'>(</font>JSAMPIMAGE<font face='Lucida Console'>)</font> NULL,
|
|
<font face='Lucida Console'>(</font>JDIMENSION <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> NULL, <font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font color='#979000'>0</font>,
|
|
output_buf, out_row_ctr, out_rows_avail<font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
|
|
<font color='#0000FF'>#endif</font> <font color='#009900'>/* QUANT_2PASS_SUPPORTED */</font>
|
|
|
|
|
|
<font color='#009900'>/*
|
|
* Initialize main buffer controller.
|
|
*/</font>
|
|
|
|
<b><a name='GLOBAL'></a>GLOBAL</b><font face='Lucida Console'>(</font><font color='#0000FF'><u>void</u></font><font face='Lucida Console'>)</font>
|
|
<b><a name='jinit_d_main_controller'></a>jinit_d_main_controller</b> <font face='Lucida Console'>(</font>j_decompress_ptr cinfo, boolean need_full_buffer<font face='Lucida Console'>)</font>
|
|
<b>{</b>
|
|
my_main_ptr main;
|
|
<font color='#0000FF'><u>int</u></font> ci, rgroup, ngroups;
|
|
jpeg_component_info <font color='#5555FF'>*</font>compptr;
|
|
|
|
main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>my_main_ptr<font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_small<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
|
|
<font color='#BB00BB'>SIZEOF</font><font face='Lucida Console'>(</font>my_main_controller<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>main <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#0000FF'>struct</font> jpeg_d_main_controller <font color='#5555FF'>*</font><font face='Lucida Console'>)</font> main;
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>pub.start_pass <font color='#5555FF'>=</font> start_pass_main;
|
|
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>need_full_buffer<font face='Lucida Console'>)</font> <font color='#009900'>/* shouldn't happen */</font>
|
|
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_BAD_BUFFER_MODE<font face='Lucida Console'>)</font>;
|
|
|
|
<font color='#009900'>/* Allocate the workspace.
|
|
* ngroups is the number of row groups we need.
|
|
*/</font>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>upsample<font color='#5555FF'>-</font><font color='#5555FF'>></font>need_context_rows<font face='Lucida Console'>)</font> <b>{</b>
|
|
<font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size <font color='#5555FF'><</font> <font color='#979000'>2</font><font face='Lucida Console'>)</font> <font color='#009900'>/* unsupported, see comments above */</font>
|
|
<font color='#BB00BB'>ERREXIT</font><font face='Lucida Console'>(</font>cinfo, JERR_NOTIMPL<font face='Lucida Console'>)</font>;
|
|
<font color='#BB00BB'>alloc_funny_pointers</font><font face='Lucida Console'>(</font>cinfo<font face='Lucida Console'>)</font>; <font color='#009900'>/* Alloc space for xbuffer[] lists */</font>
|
|
ngroups <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size <font color='#5555FF'>+</font> <font color='#979000'>2</font>;
|
|
<b>}</b> <font color='#0000FF'>else</font> <b>{</b>
|
|
ngroups <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size;
|
|
<b>}</b>
|
|
|
|
<font color='#0000FF'>for</font> <font face='Lucida Console'>(</font>ci <font color='#5555FF'>=</font> <font color='#979000'>0</font>, compptr <font color='#5555FF'>=</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>comp_info; ci <font color='#5555FF'><</font> cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>num_components;
|
|
ci<font color='#5555FF'>+</font><font color='#5555FF'>+</font>, compptr<font color='#5555FF'>+</font><font color='#5555FF'>+</font><font face='Lucida Console'>)</font> <b>{</b>
|
|
rgroup <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>v_samp_factor <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_v_scaled_size<font face='Lucida Console'>)</font> <font color='#5555FF'>/</font>
|
|
cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>min_DCT_v_scaled_size; <font color='#009900'>/* height of a row group of component */</font>
|
|
main<font color='#5555FF'>-</font><font color='#5555FF'>></font>buffer[ci] <font color='#5555FF'>=</font> <font face='Lucida Console'>(</font><font color='#5555FF'>*</font>cinfo<font color='#5555FF'>-</font><font color='#5555FF'>></font>mem<font color='#5555FF'>-</font><font color='#5555FF'>></font>alloc_sarray<font face='Lucida Console'>)</font>
|
|
<font face='Lucida Console'>(</font><font face='Lucida Console'>(</font>j_common_ptr<font face='Lucida Console'>)</font> cinfo, JPOOL_IMAGE,
|
|
compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>width_in_blocks <font color='#5555FF'>*</font> compptr<font color='#5555FF'>-</font><font color='#5555FF'>></font>DCT_h_scaled_size,
|
|
<font face='Lucida Console'>(</font>JDIMENSION<font face='Lucida Console'>)</font> <font face='Lucida Console'>(</font>rgroup <font color='#5555FF'>*</font> ngroups<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
|
|
<b>}</b>
|
|
<b>}</b>
|
|
|
|
</pre></body></html> |
