gui_jpeg.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 uC/GUI
*   					 Universal graphic software for embedded applications
*
*   					(c) Copyright 2002, Micrium Inc., Weston, FL
*   					(c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*   		   礐/GUI is protected by international copyright laws. Knowledge of the
*   		   source code may not be used to write a similar product. This file may
*   		   only be used in accordance with a license and should not be redistributed
*   		   in any way. We appreciate your understanding and fairness.
*
----------------------------------------------------------------------
File		: GUI_JPEG.c
Purpose 	: Implementation of GUI_JPEG... functions
---------------------------END-OF-HEADER------------------------------
*/

#include <stdlib.h>

#include "GUI_Private.h"
#include "jpeglib.h"
#include "jerror.h"
#include "jmemsys.h"


/*********************************************************************
*
*   	Local defines & data types
*
**********************************************************************
*/
#define INPUT_BUF_SIZE  4096	/* choose an efficiently fread'able size */

/* Expanded data source object for stdio input */

typedef struct
{
	struct jpeg_source_mgr	pub;	/* public fields */
	const U8				*pFileData;
	I32						FileSize;
	I32						Off;
	boolean					start_of_file;	/* have we gotten any data yet? */
} SOURCE_MANAGER;

static const U8 _abEnd[2] = {
0xFF, JPEG_EOI
};

/*********************************************************************
*
*   	Static code
*
**********************************************************************
*/

/*
 * Initialize source --- called by jpeg_read_header
 * before any data is actually read.
 */

static void _InitSource(j_decompress_ptr cinfo)
{
	SOURCE_MANAGER* pSrc = (SOURCE_MANAGER *) cinfo->src;

	/* We reset the empty-input-file flag for each image,
	 * but we don't clear the input buffer.
	 * This is correct behavior for reading a series of images from one source.
	 */
	pSrc->start_of_file = TRUE;
}

/*
 * Fill the input buffer --- called whenever buffer is emptied.
 *
 * In typical applications, this should read fresh data into the buffer
 * (ignoring the current state of next_input_byte & bytes_in_buffer),
 * reset the pointer & count to the start of the buffer, and return TRUE
 * indicating that the buffer has been reloaded.  It is not necessary to
 * fill the buffer entirely, only to obtain at least one more byte.
 *
 * There is no such thing as an EOF return.  If the end of the file has been
 * reached, the routine has a choice of ERREXIT() or inserting fake data into
 * the buffer.  In most cases, generating a warning message and inserting a
 * fake EOI marker is the best course of action --- this will allow the
 * decompressor to output however much of the image is there.  However,
 * the resulting error message is misleading if the real problem is an empty
 * input file, so we handle that case specially.
 *
 * In applications that need to be able to suspend compression due to input
 * not being available yet, a FALSE return indicates that no more data can be
 * obtained right now, but more may be forthcoming later.  In this situation,
 * the decompressor will return to its caller (with an indication of the
 * number of scanlines it has read, if any).  The application should resume
 * decompression after it has loaded more data into the input buffer.  Note
 * that there are substantial restrictions on the use of suspension --- see
 * the documentation.
 *
 * When suspending, the decompressor will back up to a convenient restart point
 * (typically the start of the current MCU). next_input_byte & bytes_in_buffer
 * indicate where the restart point will be if the current call returns FALSE.
 * Data beyond this point must be rescanned after resumption, so move it to
 * the front of the buffer rather than discarding it.
 */

static boolean _FillInputBuffer(j_decompress_ptr cinfo)
{
	SOURCE_MANAGER* pSrc = (SOURCE_MANAGER *) cinfo->src;
	size_t nbytes;
	int RemBytes = pSrc->FileSize - pSrc->Off;
	if (RemBytes > 0)
	{
		nbytes = (RemBytes > INPUT_BUF_SIZE) ? INPUT_BUF_SIZE : RemBytes;
		pSrc->pub.next_input_byte = pSrc->pFileData + pSrc->Off;
		pSrc->Off += nbytes;
	}
	else
	{
		if (pSrc->start_of_file)	/* Treat empty input file as fatal error */
		{
			ERREXIT(cinfo, JERR_INPUT_EMPTY);
		}
		WARNMS(cinfo, JWRN_JPEG_EOF);
		/* Insert a fake EOI marker */
		nbytes = 2;
		pSrc->pub.next_input_byte = _abEnd;
	}

	pSrc->pub.bytes_in_buffer = nbytes;
	pSrc->start_of_file = FALSE;
	return TRUE;
}

/*
 * Skip data --- used to skip over a potentially large amount of
 * uninteresting data (such as an APPn marker).
 *
 * Writers of suspendable-input applications must note that skip_input_data
 * is not granted the right to give a suspension return.  If the skip extends
 * beyond the data currently in the buffer, the buffer can be marked empty so
 * that the next read will cause a fill_input_buffer call that can suspend.
 * Arranging for additional bytes to be discarded before reloading the input
 * buffer is the application writer's problem.
 */

static void _SkipInputData(j_decompress_ptr cinfo, long num_bytes)
{
	SOURCE_MANAGER* pSrc = (SOURCE_MANAGER *) cinfo->src;
	/* Just a dumb implementation for now.  Could use fseek() except
	 * it doesn't work on pipes.  Not clear that being smart is worth
	 * any trouble anyway --- large skips are infrequent.
	 */
	if (num_bytes > 0)
	{
		while (num_bytes > (long) pSrc->pub.bytes_in_buffer)
		{
			num_bytes -= (long) pSrc->pub.bytes_in_buffer;
			(void) _FillInputBuffer(cinfo);
			/* note we assume that fill_input_buffer will never return FALSE,
			 * so suspension need not be handled.
			 */
		}
		pSrc->pub.next_input_byte += (size_t) num_bytes;
		pSrc->pub.bytes_in_buffer -= (size_t) num_bytes;
	}
}
/*
 * An additional method that can be provided by data source modules is the
 * resync_to_restart method for error recovery in the presence of RST markers.
 * For the moment, this source module just uses the default resync method
 * provided by the JPEG library.  That method assumes that no backtracking
 * is possible.
 */


/*
 * Terminate source --- called by jpeg_finish_decompress
 * after all data has been read.  Often a no-op.
 *
 * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
 * application must deal with any cleanup that should happen even
 * for error exit.
 */

static void _TermSource(j_decompress_ptr cinfo)
{
	/* no work necessary here */
	GUI_USE_PARA(cinfo);
}


static void _InitSrc(j_decompress_ptr cinfo, const U8 *pFileData, I32 FileSize)
{
	SOURCE_MANAGER* pSrc;
	/* The source object and input buffer are made permanent so that a series
	 * of JPEG images can be read from the same file by calling jpeg_stdio_src
	 * only before the first one.  (If we discarded the buffer at the end of
	 * one image, we'd likely lose the start of the next one.)
	 * This makes it unsafe to use this manager and a different source
	 * manager serially with the same JPEG object.  Caveat programmer.
	 */
	if (cinfo->src == NULL)
	{
		/* first time for this JPEG object? */
		cinfo->src = (jpeg_source_mgr *) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(SOURCE_MANAGER));
	}
	pSrc = (SOURCE_MANAGER *) cinfo->src;
	pSrc->pub.init_source = _InitSource;
	pSrc->pub.fill_input_buffer = _FillInputBuffer;
	pSrc->pub.skip_input_data = _SkipInputData;
	pSrc->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
	pSrc->pub.term_source = _TermSource;
	pSrc->pub.bytes_in_buffer = 0;    /* forces fill_input_buffer on first read */
	pSrc->pub.next_input_byte = NULL; /* until buffer loaded */
	/*
	 *  Init private part of Source manager
	 */
	pSrc->FileSize = FileSize;
	pSrc->pFileData = pFileData;
	pSrc->Off = 0;
}


/*********************************************************************
*
*   	Memory allocation
*
**********************************************************************
*/

int AllocCnt;   /* for debugging only */
int TotalSize;
/*
 * Memory allocation and freeing are controlled by the regular library
 * routines malloc() and free().
 */

GLOBAL(void *) jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject)
{
				   GUI_USE_PARA(cinfo);
				   AllocCnt++;
				   TotalSize += sizeofobject;
				   return (void *) malloc(sizeofobject);
}

GLOBAL(void) jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject)
{
				 GUI_USE_PARA(cinfo);
				 GUI_USE_PARA(sizeofobject);
				 if (--AllocCnt)
				 {
					 TotalSize = 0;
				 }
				 free(object);
}

/*
 * This routine computes the total memory space available for allocation.
 * Here we always say, "we got all you want bud!"
 */

GLOBAL(long) jpeg_mem_available(j_common_ptr cinfo, long min_bytes_needed, long max_bytes_needed, long already_allocated)
{
				 GUI_USE_PARA(cinfo);
				 GUI_USE_PARA(min_bytes_needed);
				 GUI_USE_PARA(already_allocated);
				 return max_bytes_needed;
}


/*
 * These routines take care of any system-dependent initialization and
 * cleanup required.  Here, there isn't any.
 * just set max_memory_to_use to 0
 */

GLOBAL(long) jpeg_mem_init(j_common_ptr cinfo)
{
				 GUI_USE_PARA(cinfo);
				 return 0;
}

GLOBAL(void) jpeg_mem_term(j_common_ptr cinfo)
{
				 GUI_USE_PARA(cinfo);
}















/*********************************************************************
*
*   	_Init
*/
static void _Init(struct jpeg_error_mgr *pjerr, struct jpeg_decompress_struct *pcinfo, const void *pFileData, int DataSize)
{
	/* 1. Allocate and initialize a JPEG decompression object. */
	pcinfo->err = jpeg_std_error(pjerr);
	jpeg_create_decompress(pcinfo);
	/* 2. Init the source manager so the library can retrieve data via methods */
	_InitSrc(pcinfo, (const U8 *) pFileData, DataSize);
	/* 3. Call jpeg_read_header() to obtain image info. */
	jpeg_read_header(pcinfo, TRUE);
}

/*********************************************************************
*
*   	_WritePixelsRGB
*/
static void _WritePixelsRGB(const U8 *p, int x0, int y0, int xSize)
{
	U8 r,g,b;
	while (xSize)
	{
		r = *p++;
		g = *p++;
		b = *p++;
		LCD_SetColor(r | (g << 8) | (U32) ((U32) b << 16));
		LCD_DrawPixel(x0++, y0);
		xSize--;
	}
}

/*********************************************************************
*
*   	_WritePixelsGray
*/
static void _WritePixelsGray(const U8 *p, int x0, int y0, int xSize)
{
	U8 u;
	while (xSize)
	{
		u = *p++;
		LCD_SetColor(u * (U32) 0x10101);
		LCD_DrawPixel(x0++, y0);
		xSize--;
	}
}

/*********************************************************************
*
*   	Public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI_JPEG_GetInfo
*/
int GUI_JPEG_GetInfo(const void *pFileData, int DataSize, GUI_JPEG_INFO *pInfo)
{
	struct jpeg_decompress_struct cinfo;
	struct jpeg_error_mgr jerr;
	_Init(&jerr, &cinfo, pFileData, DataSize);
	/*
	 * Release the JPEG decompression object.
	 */
	jpeg_destroy_decompress(&cinfo);
	if (pInfo)
	{
		pInfo->XSize = cinfo.image_width;
		pInfo->YSize = cinfo.image_height;
	}
	return 0;
}


/*********************************************************************
*
*   	GUI_JPEG_Draw
*/
int GUI_JPEG_Draw(const void *pFileData, int DataSize, int x0, int y0)
{
#if (GUI_WINSUPPORT)
	GUI_RECT r;
#endif
	int Ret = 0;
	GUI_HMEM hBuffer = 0;
	struct jpeg_decompress_struct cinfo;
	struct jpeg_error_mgr jerr;
	GUI_LOCK();
	_Init(&jerr, &cinfo, pFileData, DataSize);
#if (GUI_WINSUPPORT)
	WM_ADDORG(x0, y0);
	r.x1 = (r.x0 = x0) + cinfo.image_width - 1;
	r.y1 = (r.y0 = y0) + cinfo.image_height - 1;
	WM_ITERATE_START(&r)
	{
#endif
		if (hBuffer)
		{
			_Init(&jerr, &cinfo, pFileData, DataSize);
		}
		/* 4. Set up parameters for decompression (optional ...) */
		/* 5. jpeg_start_decompress(...); Should normally return quickly */
		jpeg_start_decompress(&cinfo);
		/* 6. while (scan lines remain to be read) */
		/*     jpeg_read_scanlines(...); */
		if (!hBuffer)
		{
			hBuffer = GUI_ALLOC_AllocNoInit(cinfo.image_width * 3);
		}
		while (cinfo.output_scanline < cinfo.output_height)
		{
			U8* p;
			p = (U8 *) GUI_ALLOC_h2p(hBuffer);
			jpeg_read_scanlines(&cinfo, &p, 1);
			if (cinfo.jpeg_color_space == JCS_GRAYSCALE)
			{
				_WritePixelsGray(p, x0, y0 + cinfo.output_scanline, cinfo.image_width);
			}
			else
			{
				_WritePixelsRGB(p, x0, y0 + cinfo.output_scanline, cinfo.image_width);
			}
		}
		/* 7. jpeg_finish_decompress(...); */
		/*    Complete the decompression cycle.  This causes working memory associated */
		/*    with the JPEG object to be released. */
		jpeg_finish_decompress(&cinfo);
		/* 8. Release the JPEG decompression object. */
		jpeg_destroy_decompress(&cinfo);
#if (GUI_WINSUPPORT)
	} WM_ITERATE_END();
#endif
	GUI_ALLOC_Free(hBuffer);
	GUI_UNLOCK();
	return Ret;
}

/*************************** End of file ****************************/