410 lines
13 KiB
C
410 lines
13 KiB
C
/*
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*********************************************************************************************************
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* uC/GUI
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* Universal graphic software for embedded applications
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*
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* (c) Copyright 2002, Micrium Inc., Weston, FL
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* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
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*
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* µC/GUI is protected by international copyright laws. Knowledge of the
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* source code may not be used to write a similar product. This file may
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* only be used in accordance with a license and should not be redistributed
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* in any way. We appreciate your understanding and fairness.
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*
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----------------------------------------------------------------------
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File : GUI_JPEG.c
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Purpose : Implementation of GUI_JPEG... functions
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---------------------------END-OF-HEADER------------------------------
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*/
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#include <stdlib.h>
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#include "GUI_Private.h"
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#include "jpeglib.h"
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#include "jerror.h"
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#include "jmemsys.h"
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/*********************************************************************
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*
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* Local defines & data types
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*
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**********************************************************************
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*/
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#define INPUT_BUF_SIZE 4096 /* choose an efficiently fread'able size */
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/* Expanded data source object for stdio input */
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typedef struct {
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struct jpeg_source_mgr pub; /* public fields */
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const U8* pFileData;
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I32 FileSize;
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I32 Off;
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boolean start_of_file; /* have we gotten any data yet? */
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} SOURCE_MANAGER;
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static const U8 _abEnd[2] = {
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0xFF, JPEG_EOI
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};
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/*********************************************************************
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*
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* Static code
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*
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**********************************************************************
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*/
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/*
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* Initialize source --- called by jpeg_read_header
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* before any data is actually read.
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*/
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static void _InitSource (j_decompress_ptr cinfo) {
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SOURCE_MANAGER* pSrc = (SOURCE_MANAGER*) cinfo->src;
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/* We reset the empty-input-file flag for each image,
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* but we don't clear the input buffer.
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* This is correct behavior for reading a series of images from one source.
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*/
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pSrc->start_of_file = TRUE;
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}
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/*
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* Fill the input buffer --- called whenever buffer is emptied.
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*
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* In typical applications, this should read fresh data into the buffer
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* (ignoring the current state of next_input_byte & bytes_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been reloaded. It is not necessary to
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* fill the buffer entirely, only to obtain at least one more byte.
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*
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* There is no such thing as an EOF return. If the end of the file has been
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* reached, the routine has a choice of ERREXIT() or inserting fake data into
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* the buffer. In most cases, generating a warning message and inserting a
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* fake EOI marker is the best course of action --- this will allow the
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* decompressor to output however much of the image is there. However,
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* the resulting error message is misleading if the real problem is an empty
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* input file, so we handle that case specially.
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*
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* In applications that need to be able to suspend compression due to input
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* not being available yet, a FALSE return indicates that no more data can be
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* obtained right now, but more may be forthcoming later. In this situation,
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* the decompressor will return to its caller (with an indication of the
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* number of scanlines it has read, if any). The application should resume
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* decompression after it has loaded more data into the input buffer. Note
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* that there are substantial restrictions on the use of suspension --- see
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* the documentation.
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*
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* When suspending, the decompressor will back up to a convenient restart point
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* (typically the start of the current MCU). next_input_byte & bytes_in_buffer
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* indicate where the restart point will be if the current call returns FALSE.
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* Data beyond this point must be rescanned after resumption, so move it to
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* the front of the buffer rather than discarding it.
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*/
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static boolean _FillInputBuffer(j_decompress_ptr cinfo) {
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SOURCE_MANAGER* pSrc = (SOURCE_MANAGER*) cinfo->src;
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size_t nbytes;
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int RemBytes = pSrc->FileSize - pSrc->Off;
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if (RemBytes > 0) {
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nbytes = (RemBytes > INPUT_BUF_SIZE) ? INPUT_BUF_SIZE : RemBytes;
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pSrc->pub.next_input_byte = pSrc->pFileData + pSrc->Off;
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pSrc->Off += nbytes;
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} else {
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if (pSrc->start_of_file) /* Treat empty input file as fatal error */
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ERREXIT(cinfo, JERR_INPUT_EMPTY);
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WARNMS(cinfo, JWRN_JPEG_EOF);
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/* Insert a fake EOI marker */
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nbytes = 2;
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pSrc->pub.next_input_byte = _abEnd;
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}
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pSrc->pub.bytes_in_buffer = nbytes;
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pSrc->start_of_file = FALSE;
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return TRUE;
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}
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/*
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* Skip data --- used to skip over a potentially large amount of
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* uninteresting data (such as an APPn marker).
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*
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* Writers of suspendable-input applications must note that skip_input_data
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* is not granted the right to give a suspension return. If the skip extends
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* beyond the data currently in the buffer, the buffer can be marked empty so
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* that the next read will cause a fill_input_buffer call that can suspend.
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* Arranging for additional bytes to be discarded before reloading the input
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* buffer is the application writer's problem.
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*/
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static void _SkipInputData (j_decompress_ptr cinfo, long num_bytes) {
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SOURCE_MANAGER* pSrc = (SOURCE_MANAGER*) cinfo->src;
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/* Just a dumb implementation for now. Could use fseek() except
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* it doesn't work on pipes. Not clear that being smart is worth
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* any trouble anyway --- large skips are infrequent.
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*/
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if (num_bytes > 0) {
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while (num_bytes > (long) pSrc->pub.bytes_in_buffer) {
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num_bytes -= (long) pSrc->pub.bytes_in_buffer;
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(void) _FillInputBuffer(cinfo);
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/* note we assume that fill_input_buffer will never return FALSE,
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* so suspension need not be handled.
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*/
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}
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pSrc->pub.next_input_byte += (size_t) num_bytes;
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pSrc->pub.bytes_in_buffer -= (size_t) num_bytes;
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}
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}
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/*
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* An additional method that can be provided by data source modules is the
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* resync_to_restart method for error recovery in the presence of RST markers.
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* For the moment, this source module just uses the default resync method
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* provided by the JPEG library. That method assumes that no backtracking
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* is possible.
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*/
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/*
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* Terminate source --- called by jpeg_finish_decompress
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* after all data has been read. Often a no-op.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/
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static void _TermSource(j_decompress_ptr cinfo) {
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/* no work necessary here */
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GUI_USE_PARA(cinfo);
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}
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static void _InitSrc(j_decompress_ptr cinfo, const U8* pFileData, I32 FileSize) {
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SOURCE_MANAGER* pSrc;
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/* The source object and input buffer are made permanent so that a series
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* of JPEG images can be read from the same file by calling jpeg_stdio_src
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* only before the first one. (If we discarded the buffer at the end of
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* one image, we'd likely lose the start of the next one.)
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* This makes it unsafe to use this manager and a different source
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* manager serially with the same JPEG object. Caveat programmer.
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*/
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if (cinfo->src == NULL) { /* first time for this JPEG object? */
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cinfo->src = (jpeg_source_mgr *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(SOURCE_MANAGER));
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}
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pSrc = (SOURCE_MANAGER*) cinfo->src;
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pSrc->pub.init_source = _InitSource;
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pSrc->pub.fill_input_buffer = _FillInputBuffer;
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pSrc->pub.skip_input_data = _SkipInputData;
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pSrc->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
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pSrc->pub.term_source = _TermSource;
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pSrc->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
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pSrc->pub.next_input_byte = NULL; /* until buffer loaded */
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/*
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* Init private part of Source manager
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*/
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pSrc->FileSize = FileSize;
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pSrc->pFileData = pFileData;
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pSrc->Off = 0;
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}
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/*********************************************************************
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*
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* Memory allocation
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*
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**********************************************************************
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*/
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int AllocCnt; /* for debugging only */
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int TotalSize;
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/*
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* Memory allocation and freeing are controlled by the regular library
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* routines malloc() and free().
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*/
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GLOBAL(void *) jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) {
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GUI_USE_PARA(cinfo);
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AllocCnt++;
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TotalSize += sizeofobject;
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return (void *) malloc(sizeofobject);
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}
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GLOBAL(void) jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) {
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GUI_USE_PARA(cinfo);
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GUI_USE_PARA(sizeofobject);
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if (--AllocCnt) {
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TotalSize = 0;
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}
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free(object);
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}
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/*
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* This routine computes the total memory space available for allocation.
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* Here we always say, "we got all you want bud!"
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*/
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GLOBAL(long) jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, long max_bytes_needed, long already_allocated) {
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GUI_USE_PARA(cinfo);
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GUI_USE_PARA(min_bytes_needed);
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GUI_USE_PARA(already_allocated);
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return max_bytes_needed;
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}
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/*
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* These routines take care of any system-dependent initialization and
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* cleanup required. Here, there isn't any.
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* just set max_memory_to_use to 0
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*/
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GLOBAL(long) jpeg_mem_init (j_common_ptr cinfo) {
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GUI_USE_PARA(cinfo);
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return 0;
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}
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GLOBAL(void) jpeg_mem_term (j_common_ptr cinfo) {
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GUI_USE_PARA(cinfo);
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}
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/*********************************************************************
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*
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* _Init
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*/
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static void _Init(struct jpeg_error_mgr* pjerr, struct jpeg_decompress_struct *pcinfo, const void * pFileData, int DataSize) {
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/* 1. Allocate and initialize a JPEG decompression object. */
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pcinfo->err = jpeg_std_error(pjerr);
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jpeg_create_decompress(pcinfo);
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/* 2. Init the source manager so the library can retrieve data via methods */
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_InitSrc(pcinfo, (const U8*)pFileData, DataSize);
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/* 3. Call jpeg_read_header() to obtain image info. */
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jpeg_read_header(pcinfo, TRUE);
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}
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/*********************************************************************
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*
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* _WritePixelsRGB
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*/
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static void _WritePixelsRGB(const U8*p, int x0, int y0, int xSize) {
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U8 r,g,b;
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while (xSize) {
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r = *p++;
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g = *p++;
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b = *p++;
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LCD_SetColor(r | (g << 8) | (U32)((U32)b << 16));
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LCD_DrawPixel(x0++, y0);
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xSize--;
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}
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}
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/*********************************************************************
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*
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* _WritePixelsGray
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*/
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static void _WritePixelsGray(const U8*p, int x0, int y0, int xSize) {
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U8 u;
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while (xSize) {
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u = *p++;
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LCD_SetColor(u * (U32)0x10101);
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LCD_DrawPixel(x0++, y0);
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xSize--;
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}
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}
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/*********************************************************************
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*
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* Public code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* GUI_JPEG_GetInfo
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*/
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int GUI_JPEG_GetInfo(const void * pFileData, int DataSize, GUI_JPEG_INFO* pInfo) {
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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_Init(&jerr, &cinfo, pFileData, DataSize);
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/*
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* Release the JPEG decompression object.
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*/
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jpeg_destroy_decompress(&cinfo);
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if (pInfo) {
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pInfo->XSize = cinfo.image_width;
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pInfo->YSize = cinfo.image_height;
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}
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return 0;
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}
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/*********************************************************************
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*
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* GUI_JPEG_Draw
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*/
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int GUI_JPEG_Draw(const void * pFileData, int DataSize, int x0, int y0) {
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#if (GUI_WINSUPPORT)
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GUI_RECT r;
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#endif
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int Ret = 0;
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GUI_HMEM hBuffer = 0;
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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GUI_LOCK();
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_Init(&jerr, &cinfo, pFileData, DataSize);
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#if (GUI_WINSUPPORT)
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WM_ADDORG(x0,y0);
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r.x1 = (r.x0 = x0) + cinfo.image_width - 1;
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r.y1 = (r.y0 = y0) + cinfo.image_height - 1;
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WM_ITERATE_START(&r) {
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#endif
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if (hBuffer) {
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_Init(&jerr, &cinfo, pFileData, DataSize);
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}
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/* 4. Set up parameters for decompression (optional ...) */
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/* 5. jpeg_start_decompress(...); Should normally return quickly */
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jpeg_start_decompress(&cinfo);
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/* 6. while (scan lines remain to be read) */
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/* jpeg_read_scanlines(...); */
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if (!hBuffer) {
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hBuffer = GUI_ALLOC_AllocNoInit(cinfo.image_width * 3);
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}
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while (cinfo.output_scanline < cinfo.output_height) {
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U8* p;
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p = (U8*)GUI_ALLOC_h2p(hBuffer);
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jpeg_read_scanlines(&cinfo, &p, 1);
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if (cinfo.jpeg_color_space == JCS_GRAYSCALE) {
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_WritePixelsGray(p, x0, y0 + cinfo.output_scanline, cinfo.image_width);
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} else {
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_WritePixelsRGB(p, x0, y0 + cinfo.output_scanline, cinfo.image_width);
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}
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}
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/* 7. jpeg_finish_decompress(...); */
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/* Complete the decompression cycle. This causes working memory associated */
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/* with the JPEG object to be released. */
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jpeg_finish_decompress(&cinfo);
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/* 8. Release the JPEG decompression object. */
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jpeg_destroy_decompress(&cinfo);
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#if (GUI_WINSUPPORT)
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} WM_ITERATE_END();
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#endif
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GUI_ALLOC_Free(hBuffer);
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GUI_UNLOCK();
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return Ret;
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}
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/*************************** End of file ****************************/
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