MCU简单文档生成

sick · 发表于 2020-7-15 11:14:18

主机环境：Win10 64bit

开发环境：MDK5.23

目标板：Cortex-M MCU

之前有次在群里看到有人询问单片机生成PDF的问题，突然觉得有些兴趣所以就学习了一下libHaru库,libHaru库是一个十分不错的库，对于PDF的实现来说也是相当齐全的，在PC上使用是完全没有问题的，但在资源紧张的MCU上，还是有些困难的，因此就想找一下适用于MCU的生成PDF的库，结果不太理想，都是一些需要实现动态内存管理的平台才行，而且这些库都是把生成的数据放在了内存中，直到保存文件时才写入到文件中，这对于一般只有几十或者几百KB级别的单片机来说更不可能了，于是乎，萌发了自己动手写一个基本的能用于MCU的生成PDF文件的库，我称之为libpdf，其中的接口参考了libHaru，如下所示：

当然有些接口还没有实现，但基本的操作还是可以的，等以后再逐渐完善吧，pdflib是生成pdf文件的，因此要基于Fatfs来实现文件的操作，pdflib库只有两个文件，也相应的参考了pdfgen库，该库在后面有链接，

头文件如下：

#ifndef __PDFLIB_H__
#define __PDFLIB_H__
#include "ff.h"
/*----- standard C library functions -----------------------------------------*/
#define LPDF_FOPEN f_open
#define LPDF_FCLOSE f_close
#define LPDF_FREAD f_read
#define LPDF_FWRITE f_write
#define LPDF_FFLUSH f_sync
#define LPDF_FSEEK f_seek
#define LPDF_FTELL f_tell
#define LPDF_FEOF f_eof
#define LPDF_FERROR f_error
#define LPDF_RENAME f_rename
#define LPDF_REMOVE f_unlink
#define LPDF_MALLOC malloc
#define LPDF_FREE free
#define LPDF_FILE FIL
#define LPDF_TIME time
#define LPDF_PRINTF printf
#define LPDF_SPRINTF sprintf
#define LPDF_FPRINTF f_printf
#define LPDF_VOID void
#define LPDF_SIN sin
#define LPDF_COS cos
/* native OS integer types */
typedef signed int LPDF_INT;
typedef unsigned int LPDF_UINT;
/* 32bit integer types
*/
typedef signed int LPDF_INT32;
typedef unsigned int LPDF_UINT32;
/* 16bit integer types
*/
typedef signed short LPDF_INT16;
typedef unsigned short LPDF_UINT16;
/* 8bit integer types
*/
typedef signed char LPDF_INT8;
typedef unsigned char LPDF_UINT8;
/* 8bit binary types
*/
typedef unsigned char LPDF_BYTE;
/* float type (32bit IEEE754)
*/
typedef float LPDF_REAL;
/* double type (64bit IEEE754)
*/
typedef double LPDF_DOUBLE;
/* boolean type (0: False, !0: True)
*/
typedef signed int LPDF_BOOL;
/* error-no type (32bit unsigned integer)
*/
typedef unsigned long LPDF_STATUS;
#define LPDF_OK 0
#define LPDF_FAILED 1
/*----- font state -----------------------------------------------------------*/
#define LPDF_FONT_INVALID 0x00FF
#define LPDF_FONT_COURIER 0x0000
#define LPDF_FONT_COURIER_B 0x0001
#define LPDF_FONT_COURIER_O 0x0002
#define LPDF_FONT_COURIER_OB 0x0003
#define LPDF_FONT_HELVETICA 0x0004
#define LPDF_FONT_HELVETICA_B 0x0005
#define LPDF_FONT_HELVETICA_O 0x0006
#define LPDF_FONT_HELVETICA_BO 0x0007
#define LPDF_FONT_TIMES_R 0x0008
#define LPDF_FONT_TIMES_B 0x0009
#define LPDF_FONT_TIMES_I 0x000A
#define LPDF_FONT_TIMES_BI 0x000B
#define LPDF_FONT_SYMBOL 0x000C
#define LPDF_FONT_ZAP 0x000D
/*----- Graphis mode ---------------------------------------------------------*/
#define LPDF_GMODE_PAGE_DESCRIPTION 0x0001
#define LPDF_GMODE_PATH_OBJECT 0x0002
#define LPDF_GMODE_TEXT_OBJECT 0x0004
#define LPDF_GMODE_CLIPPING_PATH 0x0008
#define LPDF_GMODE_SHADING 0x0010
#define LPDF_GMODE_INLINE_IMAGE 0x0020
#define LPDF_GMODE_EXTERNAL_OBJECT 0x0040
#define LPDF_GMODE_INVALID 0x0080
#define LPDF_GMODE_OVER 0x0100
#define OBJ_MAX_NUM 256
/* Page的结构信息是否需要树形结构 */
typedef enum
{
OBJ_info,
OBJ_stream,
OBJ_font,
OBJ_page,
OBJ_catalog,
OBJ_pages,
OBJ_image,
}LPDF_ObjType;
typedef struct
{
LPDF_ObjType objType;
LPDF_UINT16 objIdx;
LPDF_UINT16 height;
LPDF_UINT16 width;
LPDF_UINT16 length;
LPDF_UINT gMode;
LPDF_BYTE fontType;
LPDF_BYTE fontSize;
LPDF_BYTE pState;
LPDF_VOID *doc;
}LPDF_Obj;
typedef struct
{
LPDF_Obj obj[OBJ_MAX_NUM];
LPDF_UINT32 offset;
LPDF_UINT16 objNumber;
LPDF_FILE file;
}LPDF_Doc_Rec;
typedef LPDF_Doc_Rec *LPDF_Doc;
typedef LPDF_Obj *LPDF_Page;
typedef LPDF_Obj *LPDF_Image;
extern const char *font_list[];
/*----- LPDF Interfaces-------------------------------------------------------*/
const char * LPDF_GetVersion(void);
LPDF_Doc LPDF_New(void);
LPDF_Page LPDF_AddPage(LPDF_Doc pdf);
LPDF_STATUS LPDF_SaveToFile(LPDF_Doc pdf,const char *file_name);
LPDF_STATUS LPDF_Free(LPDF_Doc pdf);
LPDF_STATUS LPDF_Page_CheckState(LPDF_Page page, LPDF_UINT mode);
LPDF_STATUS LPDF_Page_SetFontAndSize(LPDF_Page page,
const char *font_name, LPDF_UINT8 size);
LPDF_STATUS LPDF_Page_SaveParams(LPDF_Page page);
LPDF_STATUS LPDF_Page_SaveContext(LPDF_Page page);
LPDF_STATUS LPDF_Page_BeginText(LPDF_Page page);
LPDF_STATUS LPDF_Page_EndText(LPDF_Page page);
LPDF_UINT16 LPDF_Page_GetHeight(LPDF_Page page);
LPDF_UINT16 LPDF_Page_GetWidth(LPDF_Page page);
LPDF_STATUS LPDF_Page_SetHeight(LPDF_Page page, LPDF_UINT16 value);
LPDF_STATUS LPDF_Page_SetWidth(LPDF_Page page, LPDF_UINT16 value);
LPDF_STATUS LPDF_Page_ShowText(LPDF_Page page, const char *text);
LPDF_STATUS LPDF_Page_MoveTextPos(LPDF_Page page,
LPDF_INT x, LPDF_INT y);
LPDF_STATUS LPDF_Page_TextOut(LPDF_Page page,
LPDF_UINT16 x, LPDF_UINT16 y,
const char *text);
LPDF_STATUS LPDF_Page_SetRGBStroke(LPDF_Page page,
LPDF_REAL r,
LPDF_REAL g,
LPDF_REAL b);
LPDF_STATUS LPDF_Page_SetRGBFill(LPDF_Page page,
LPDF_REAL r,
LPDF_REAL g,
LPDF_REAL b);
LPDF_STATUS LPDF_Page_MoveTo (LPDF_Page page,
LPDF_UINT16 x,
LPDF_UINT16 y);
LPDF_STATUS LPDF_Page_LineTo (LPDF_Page page,
LPDF_UINT16 x,
LPDF_UINT16 y);
LPDF_STATUS LPDF_Page_Stroke(LPDF_Page page);
LPDF_STATUS LPDF_Page_ClosePathStroke(LPDF_Page page);
LPDF_STATUS LPDF_Page_DrawImage(LPDF_Page page,
LPDF_Image image,
LPDF_UINT16 x,
LPDF_UINT16 y,
LPDF_UINT16 width,
LPDF_UINT16 height);
#endif

复制代码

源文件如下：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "pdflib.h"
#define LPDF_INVALID_OBJECT 0x1033
static char pdf_buf[512];
#define LPDF_VERSIOIN_TEXT "0.0.1"
#define LPDF_FILE_HEADER_LEN 15
#define LPDF_BASEFONT_NUM 14
const char LPDF_FILE_HEADER[] = "%%PDF-1.4\n%%\xAA\xBB\xCC\xDD\n";
const char *font_list[] = {
"Courier",
"Courier-Bold",
"Courier-Oblique",
"Courier-BoldOblique",
"Helvetica",
"Helvetica-Bold",
"Helvetica-Oblique",
"Helvetica-BoldOblique",
"Times-Roman",
"Times-Bold",
"Times-Italic",
"Times-BoldItalic",
"Symbol",
"ZapfDingbats",
NULL
};
const char * LPDF_GetVersion(void)
{
return LPDF_VERSIOIN_TEXT;
}
LPDF_Doc LPDF_New(void)
{
static LPDF_Doc_Rec pdf;
LPDF_INT length = 0, i = 0;
LPDF_UINT writeBytes = 0;
FRESULT fr;
fr = LPDF_FOPEN(&pdf.file,"/tmp.pdf",FA_CREATE_ALWAYS|FA_WRITE);
if(fr)
{
LPDF_PRINTF("create tmp.pdf failed!\r\n");
return NULL;
}
LPDF_FPRINTF(&pdf.file,LPDF_FILE_HEADER); /* 写入文件头 */
pdf.offset = LPDF_FILE_HEADER_LEN;
pdf.obj[0].objIdx = pdf.offset;
length = LPDF_SPRINTF(pdf_buf,"1 0 obj\n<<\n/Type /Catalog\n/Pages 17 0 R\n>>\nendobj\n\n");
LPDF_FWRITE(&pdf.file,pdf_buf,length,&writeBytes);
pdf.offset += length;
pdf.obj[1].objIdx = pdf.offset;
length = LPDF_SPRINTF(pdf_buf,"2 0 obj\n<<\n/Creator (light pdf library 0.0.1)\n"
"/Auther (anobodykey)\n>>\nendobj\n\n");
LPDF_FWRITE(&pdf.file,pdf_buf,length,&writeBytes);
pdf.offset += length;
for(i = 0; i < LPDF_BASEFONT_NUM-2; i++)
{
pdf.obj[2+i].objIdx = pdf.offset;
length = LPDF_SPRINTF(pdf_buf,"%d 0 obj\n<<\n/Type /Font\n/Subtype /Type1\n"
"/BaseFont /%s\n/Encoding /WinAnsiEncoding\n>>\n"
"endobj\n\n",3+i,font_list);
LPDF_FWRITE(&pdf.file,pdf_buf,length,&writeBytes);
pdf.offset += length;
}
for(; i < LPDF_BASEFONT_NUM; i++)
{
pdf.obj[2+i].objIdx = pdf.offset;
length = LPDF_SPRINTF(pdf_buf,"%d 0 obj\n<<\n/Type /Font\n/Subtype /Type1\n"
"/BaseFont /%s\n>>\nendobj\n\n",3+i,font_list);
LPDF_FWRITE(&pdf.file,pdf_buf,length,&writeBytes);
pdf.offset += length;
}
pdf.objNumber = 3+i;
return (LPDF_Doc)&pdf;
}
LPDF_STATUS LPDF_SaveToFile(LPDF_Doc pdf,const char *file_name)
{
LPDF_UINT16 i = 0, child_pages = 0;
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
pdf->obj[16].objIdx = pdf->offset;
child_pages = (pdf->objNumber-2-LPDF_BASEFONT_NUM)/3 ;
length = LPDF_SPRINTF(pdf_buf,"17 0 obj\n<<\n/Types /Pages\n/Count %d\n/Kids [ ",child_pages);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
for(i = 0; i < child_pages; i++)
{
length = LPDF_SPRINTF(pdf_buf,"%d 0 R\n",18+i*3);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
}
length = LPDF_SPRINTF(pdf_buf,"]\n>>\nendobj\n\n");
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
LPDF_FPRINTF(&pdf->file,"xref\n0 %d\n0000000000 65535 f\r\n",pdf->objNumber+1);
for(i = 0 ; i < pdf->objNumber; i++)
{
LPDF_FPRINTF(&pdf->file,"%10.10d 00000 n\r\n",pdf->obj.objIdx);
}
LPDF_FPRINTF(&pdf->file,"trailer\n<<\n/Size %d\n/Root 1 0 R\n/Info 2 0 R\n>>\nstartxref\n%d\n%%%%EOF",
pdf->objNumber+1,pdf->offset);
LPDF_FCLOSE(&pdf->file);
LPDF_REMOVE(file_name);
LPDF_RENAME("tmp.pdf",file_name);
return LPDF_OK;
}
LPDF_STATUS LPDF_Free(LPDF_Doc pdf)
{
memset(pdf,sizeof(LPDF_Doc_Rec),0);
return LPDF_OK;
}
LPDF_Page LPDF_AddPage(LPDF_Doc pdf)
{
LPDF_INT length = 0,i = 0;
LPDF_Page page = NULL;
LPDF_UINT writeBytes = 0;
pdf->obj[pdf->objNumber].objIdx = pdf->offset;
length = LPDF_SPRINTF(pdf_buf,"%d 0 obj\n<<\n/Type /Page\n/Parent 4 0 R\n/Contents %d 0 R\n"
"/Resources <<\n/ProcSet [/PDF /TEXT /ImageB /ImageC /ImageI]\n"
"/Font <<\n",pdf->objNumber+1,pdf->objNumber+2);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
while(font_list)
{
length = LPDF_SPRINTF(pdf_buf,"/F%d %d 0 R\n",i+1,3+i);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
i+=1;
}
LPDF_FPRINTF(&pdf->file,">>\n>>\n");
pdf->offset += 4;
page = (LPDF_Page)&pdf->obj[pdf->objNumber];
page->width = 595;
page->height = 842;
page->gMode = LPDF_GMODE_INVALID;
page->fontType = LPDF_FONT_INVALID;
page->doc = pdf;
return page;
}
LPDF_STATUS LPDF_Page_SetHeight(LPDF_Page page, LPDF_UINT16 value)
{
page->height = value;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_SetWidth(LPDF_Page page, LPDF_UINT16 value)
{
page->width = value;
return LPDF_OK;
}
LPDF_UINT16 LPDF_Page_GetHeight(LPDF_Page page)
{
if(page)
{
return page->height;
}
return LPDF_OK;
}
LPDF_UINT16 LPDF_Page_GetWidth(LPDF_Page page)
{
if(page)
{
return page->width;
}
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_CheckState(LPDF_Page page, LPDF_UINT mode)
{
if(!page)
return LPDF_INVALID_OBJECT;
if(!(page->gMode&mode))
return LPDF_FAILED;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_SetFontAndSize(LPDF_Page page,
const char *font_name, LPDF_UINT8 size)
{
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_INT i = 0,length = 0;
LPDF_UINT writeBytes = 0;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_TEXT_OBJECT|LPDF_GMODE_PAGE_DESCRIPTION);
if(LPDF_OK != ret)
return ret;
while(font_list)
{
if(0 == strcmp(font_list,font_name))
{
page->fontType = i;
page->fontSize = size;
length = LPDF_SPRINTF(pdf_buf,"/F%d %d Tf\n",i+1,size);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
return LPDF_OK;
}
i+=1;
}
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_SaveParams(LPDF_Page page)
{
LPDF_INT length;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_INVALID);
if(LPDF_OK != ret)
return ret;
/* 对于每个page来说该接口只能调用一次即在GMODE为INVALID的模式下 */
length = LPDF_SPRINTF(pdf_buf,"/MediaBox [ 0 0 %d %d ]\n>>\nendobj\n\n",
page->width, page->height);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
pdf->obj[pdf->objNumber+1].objIdx = pdf->offset;
length = LPDF_SPRINTF(pdf_buf,"%d 0 obj\n<</Length %d 0 R>>\nstream\n",
pdf->objNumber+2, pdf->objNumber+3);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length = 0;
page->gMode = LPDF_GMODE_PAGE_DESCRIPTION;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_SaveContext(LPDF_Page page)
{
LPDF_INT length;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_PAGE_DESCRIPTION);
if(LPDF_OK != ret)
return ret;
/* 对于每个page来说该接口只能调用一次即在GMODE为PAGE_DESCRIPTION的模式下 */
length = LPDF_SPRINTF(pdf_buf,"endstream\nendobj\n\n");
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
pdf->obj[pdf->objNumber+2].objIdx = pdf->offset;
length = LPDF_SPRINTF(pdf_buf,"%d 0 obj\n%d\nendobj\n\n",
pdf->objNumber+3,page->length);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
pdf->objNumber += 3;
page->gMode = LPDF_GMODE_OVER;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_BeginText(LPDF_Page page)
{
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_PAGE_DESCRIPTION);
if(LPDF_OK != ret)
return ret;
LPDF_FPRINTF(&pdf->file,"BT\n");
pdf->offset += 3;
page->length += 3;
page->gMode = LPDF_GMODE_TEXT_OBJECT;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_EndText(LPDF_Page page)
{
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_TEXT_OBJECT);
if(LPDF_OK != ret)
return ret;
LPDF_FPRINTF(&pdf->file,"ET\n");
pdf->offset += 3;
page->length += 3;
page->gMode = LPDF_GMODE_PAGE_DESCRIPTION;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_ShowText(LPDF_Page page, const char *text)
{
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_TEXT_OBJECT);
if(LPDF_OK != ret)
return ret;
if(LPDF_FONT_INVALID == page->fontType)
return LPDF_OK;
length = LPDF_SPRINTF(pdf_buf,"(%s) Tj\n",text);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_MoveTextPos(LPDF_Page page,
LPDF_INT x, LPDF_INT y)
{
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_TEXT_OBJECT);
if(LPDF_OK != ret)
return ret;
length = LPDF_SPRINTF(pdf_buf,"%d %d Td\n",x,y);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_TextOut(LPDF_Page page,
LPDF_UINT16 x, LPDF_UINT16 y,
const char *text)
{
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_SetRGBStroke(LPDF_Page page,
LPDF_REAL r,
LPDF_REAL g,
LPDF_REAL b)
{
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_TEXT_OBJECT|LPDF_GMODE_PAGE_DESCRIPTION);
if(LPDF_OK != ret)
return ret;
length = LPDF_SPRINTF(pdf_buf,"%.1f %.1f %.1f RG\n",r,g,b);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_SetRGBFill(LPDF_Page page,
LPDF_REAL r,
LPDF_REAL g,
LPDF_REAL b)
{
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_TEXT_OBJECT|LPDF_GMODE_PAGE_DESCRIPTION);
if(LPDF_OK != ret)
return ret;
length = LPDF_SPRINTF(pdf_buf,"%.1f %.1f %.1f rg\n",r,g,b);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_MoveTo (LPDF_Page page,
LPDF_UINT16 x,
LPDF_UINT16 y)
{
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_PAGE_DESCRIPTION|LPDF_GMODE_PATH_OBJECT);
if(LPDF_OK != ret)
return ret;
length = LPDF_SPRINTF(pdf_buf,"%d %d m\n",x,y);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
page->gMode = LPDF_GMODE_PATH_OBJECT;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_LineTo (LPDF_Page page,
LPDF_UINT16 x,
LPDF_UINT16 y)
{
LPDF_INT length = 0;
LPDF_UINT writeBytes = 0;
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_PATH_OBJECT);
if(LPDF_OK != ret)
return ret;
length = LPDF_SPRINTF(pdf_buf,"%d %d l\n",x,y);
LPDF_FWRITE(&pdf->file,pdf_buf,length,&writeBytes);
pdf->offset += length;
page->length += length;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_Stroke(LPDF_Page page)
{
LPDF_Doc pdf = (LPDF_Doc)page->doc;
LPDF_STATUS ret = LPDF_Page_CheckState(page,LPDF_GMODE_PATH_OBJECT);
if(LPDF_OK != ret)
return ret;
LPDF_FPRINTF(&pdf->file,"S\n");
pdf->offset += 2;
page->length += 2;
page->gMode = LPDF_GMODE_PAGE_DESCRIPTION;
return LPDF_OK;
}
LPDF_STATUS LPDF_Page_DrawImage(LPDF_Page page,
LPDF_Image image,
LPDF_UINT16 x,
LPDF_UINT16 y,
LPDF_UINT16 width,
LPDF_UINT16 height)
{
return LPDF_OK;
}

复制代码

对于pdf文件结构可以去查看pdf参考手册，这里我看的是pdf-1.4参考手册，该库的测试代码我是在基于LPC54608库中的sdcard_fatfs示例改编的，同样适用于STM32，关键代码如下:
pdf = LPDF_New();
page[0] = LPDF_AddPage(pdf);
LPDF_Page_SaveParams(page[0]);
width = LPDF_Page_GetWidth(page[0]);
height = LPDF_Page_GetHeight(page[0]);
LPDF_Page_SetRGBFill(page[0], 1.0, 0.0, 0.0);
LPDF_Page_BeginText(page[0]);
LPDF_Page_MoveTextPos(page[0], 50, height-20);
while(font_list)
{
      LPDF_Page_SetFontAndSize(page[0], font_list, 24);
      LPDF_Page_ShowText(page[0], "abcdefgABCDEFG12345!\043$\045&+-@?");
      LPDF_Page_MoveTextPos(page[0], 0, -30);
      i++;
}
      LPDF_Page_SetFontAndSize(page[0], font_list[0], 24);
LPDF_Page_ShowText(page[0], LPDF_GetVersion());
LPDF_Page_EndText(page[0]);
LPDF_Page_SaveContext(page[0]);
page[1] = LPDF_AddPage(pdf);
LPDF_Page_SaveParams(page[1]);
LPDF_Page_MoveTo(page[1], width/2-50, height-200);
LPDF_Page_LineTo(page[1], width/2-50, height-300);
LPDF_Page_LineTo(page[1], width/2-50+100, height-300);
LPDF_Page_LineTo(page[1], width/2-50+100, height-200);
LPDF_Page_LineTo(page[1], width/2-50, height-200);
LPDF_Page_LineTo(page[1], width/2-50+40, height-140);
LPDF_Page_LineTo(page[1], width/2-50+40+100, height-140);
LPDF_Page_LineTo(page[1], width/2-50+100, height-200);
LPDF_Page_Stroke(page[1]);
LPDF_Page_MoveTo(page[1], width/2-50+40+100, height-140);
LPDF_Page_LineTo(page[1], width/2-50+40+100, height-240);
LPDF_Page_LineTo(page[1], width/2-50+100, height-300);
LPDF_Page_Stroke(page[1]);
LPDF_Page_SaveContext(page[1]);
LPDF_SaveToFile(pdf, "/red.pdf");
      PRINTF("\r\nCreate pdf file success!\r\n");

复制代码

代码很简单，生成了一个含有两个page的pdf文件，在第一页中用了不同的字体来显示同一个字符串，可以参考libHaru中的font_demo示例，第二页中是画了一个立方体图，下载代码到目标板，并运行该示例，效果如下：

pdflib库目前来说还是比较简单的，需慢慢完善，pdflib库代码放在下面
pdfgen链接：https://github.com/AndreRenaud/PDFGen
PS：更新为V0.04版本了

更新说明： V0.04
增加了SimSun中文字体
修复了LPDF_Page_SetLineWidth接口中内容长度错误的问题
pdflib源文件以及测试文件均需使用ANSI编码，否则无法正确显示中文字体

游客，如果您要查看本帖隐藏内容请回复

kunchen · 发表于 2020-7-16 08:57:34

感谢分享

[资料] MCU简单文档生成

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