532 lines
16 KiB
C
532 lines
16 KiB
C
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#include "base.h"
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#include "bmp.h"
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#include "string.h"
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#include "ff.h"
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#include "mymem.h"
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//////////////////////////////////////////////////////////////////////////////////
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//本程序只供学习使用，未经作者许可，不得用于其它任何用途
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//ALIENTEK STM32F407开发板
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//图片解码 驱动代码-bmp解码部分
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//创建日期:2014/5/15
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//版本：V1.0
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//版权所有，盗版必究。
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//Copyright(C) 广州市星翼电子科技有限公司 2014-2024
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//All rights reserved
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//********************************************************************************
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//升级说明
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//V1.1 20140722
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//修改minibmp_decode函数,使图片在设定区域的正中央显示
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//////////////////////////////////////////////////////////////////////////////////
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//不使用内存分配
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#if BMP_USE_MALLOC == 0
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FIL f_bfile;
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u8 bmpreadbuf[BMP_DBUF_SIZE];
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#endif
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struct _pic_phy
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{
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void (*draw_hline)(int x,int y,int len,u16 color);
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void (*draw_point)(int x,int y,u16 color);
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void (*fill)(int sx,int xy,int ex,int ey,u16 color);
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};
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static BMP_DecodeStruct *g_decode=0;
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static void draw_hline (int x,int y,int len,u16 color)
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{
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if (x>=0&&x<g_decode->x_size)
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{
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if (x+len>g_decode->x_size) len=g_decode->x_size-x;
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int ds=y*g_decode->x_size+x;
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for (int i=0;i<len;i++)
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(g_decode->data)[ds+i]=color;
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}
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}
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static void draw_point (int x,int y,u16 color)
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{
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int ds=y*g_decode->x_size+x;
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(g_decode->data)[ds]=color;
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}
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static void fill(int sx,int sy,int ex,int ey,u16 color)
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{
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for (int i=0;i<ey-sy+1;i++)
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{
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draw_hline (sx,sy+i,ex-sx+1,color);
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}
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}
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static struct _pic_phy pic_phy ={
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.draw_hline=draw_hline,
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.draw_point=draw_point,
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.fill=fill,
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};
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//标准的bmp解码,解码filename这个BMP文件
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//速度比较慢.主要
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//filename:包含路径的文件名
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//返回值:0,成功;
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// 其他,错误码.
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int BMP_Decode(const u8 *filename,BMP_DecodeStruct *bmp)
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{
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FIL* f_bmp;
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UINT br;
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u16 count;
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u8 rgb ,color_byte;
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u16 x ,y,color;
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u16 countpix=0;//记录像素
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//x,y的实际坐标
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u16 realx=0;
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u16 realy=0;
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u8 yok=1;
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int res=0;
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u8 *databuf; //数据读取存放地址
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u16 readlen=BMP_DBUF_SIZE;//一次从SD卡读取的字节数长度
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u8 *bmpbuf; //数据解码地址
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u8 biCompression=0; //记录压缩方式
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u16 rowlen; //水平方向字节数
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BITMAPINFO *pbmp; //临时指针
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databuf=(u8*)mymalloc(readlen); //开辟readlen字节的内存区域
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if(databuf==NULL)return -1; //内存申请失败.
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f_bmp=(FIL *)mymalloc(sizeof(FIL)); //开辟FIL字节的内存区域
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if(f_bmp==NULL) //内存申请失败.
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{
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myfree(databuf);
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return -1;
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}
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res=f_open(f_bmp,(const TCHAR*)filename,FA_READ);//打开文件
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if(res==0)//打开成功.
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{
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f_read(f_bmp,databuf,readlen,(UINT*)&br); //读出readlen个字节
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pbmp=(BITMAPINFO*)databuf; //得到BMP的头部信息
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count=pbmp->bmfHeader.bfOffBits; //数据偏移,得到数据段的开始地址
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color_byte=pbmp->bmiHeader.biBitCount/8; //彩色位 16/24/32
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biCompression=pbmp->bmiHeader.biCompression;//压缩方式
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g_decode=bmp;
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g_decode->y_size =pbmp->bmiHeader.biHeight; //得到图片高度
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g_decode->x_size=pbmp->bmiHeader.biWidth; //得到图片宽度
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g_decode->data = mymalloc_exm (g_decode->x_size*g_decode->y_size*2);
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//ai_draw_init();//初始化智能画图
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//水平像素必须是4的倍数!!
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if((g_decode->x_size*color_byte)%4)rowlen=((g_decode->x_size*color_byte)/4+1)*4;
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else rowlen=g_decode->x_size*color_byte;
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//开始解码BMP
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color=0;//颜色清空
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x=0 ;
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y=g_decode->y_size;
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rgb=0;
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//对于尺寸小于等于设定尺寸的图片,进行快速解码
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//realy=(y*picinfo.Div_Fac)>>13;
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realy=y;
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bmpbuf=databuf;
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while(1)
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{
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while(count<readlen) //读取一簇1024扇区 (SectorsPerClust 每簇扇区数)
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{
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if(color_byte==3) //24位颜色图
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{
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switch (rgb)
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{
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case 0:
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color=bmpbuf[count]>>3; //B
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break ;
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case 1:
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color+=((u16)bmpbuf[count]<<3)&0X07E0;//G
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break;
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case 2 :
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color+=((u16)bmpbuf[count]<<8)&0XF800;//R
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break ;
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}
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}else if(color_byte==2) //16位颜色图
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{
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switch(rgb)
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{
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case 0 :
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if(biCompression==BI_RGB)//RGB:5,5,5
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{
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color=((u16)bmpbuf[count]&0X1F); //R
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color+=(((u16)bmpbuf[count])&0XE0)<<1; //G
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}else //RGB:5,6,5
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{
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color=bmpbuf[count]; //G,B
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}
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break ;
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case 1 :
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if(biCompression==BI_RGB)//RGB:5,5,5
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{
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color+=(u16)bmpbuf[count]<<9; //R,G
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}else //RGB:5,6,5
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{
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color+=(u16)bmpbuf[count]<<8; //R,G
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}
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break ;
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}
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}else if(color_byte==4)//32位颜色图
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{
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switch (rgb)
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{
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case 0:
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color=bmpbuf[count]>>3; //B
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break ;
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case 1:
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color+=((u16)bmpbuf[count]<<3)&0X07E0;//G
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break;
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case 2 :
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color+=((u16)bmpbuf[count]<<8)&0XF800;//R
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break ;
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case 3 :
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//alphabend=bmpbuf[count];//不读取 ALPHA通道
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break ;
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}
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}else if(color_byte==1)//8位色,暂时不支持,需要用到颜色表.
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{
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}
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rgb++;
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count++ ;
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if(rgb==color_byte) //水平方向读取到1像素数数据后显示
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{
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if(x<g_decode->x_size)
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{
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//realx=(x*picinfo.Div_Fac)>>13;//x轴实际值
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realx=x;
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pic_phy.draw_point(realx,realy-1,color);//显示图片
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//POINT_COLOR=color;
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//LCD_DrawPoint(realx+picinfo.S_XOFF,realy+picinfo.S_YOFF);
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//SRAMLCD.Draw_Point(realx+picinfo.S_XOFF,realy+picinfo.S_YOFF,color);
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}
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x++;//x轴增加一个像素
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color=0x00;
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rgb=0;
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}
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countpix++;//像素累加
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if(countpix>=rowlen)//水平方向像素值到了.换行
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{
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y--;
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if(y==0)break;
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//realy=(y*picinfo.Div_Fac)>>13;//实际y值改变
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realy=y;
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//if(is_element_ok(realx,realy,0))yok=1;//此处不改变picinfo.staticx,y的值
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//else yok=0;
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yok=0;
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x=0;
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countpix=0;
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color=0x00;
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rgb=0;
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}
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}
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res=f_read(f_bmp,databuf,readlen,(UINT *)&br);//读出readlen个字节
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if(br!=readlen)readlen=br; //最后一批数据
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if(res||br==0)break; //读取出错
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bmpbuf=databuf;
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count=0;
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}
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f_close(f_bmp);//关闭文件
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}
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myfree(databuf);
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myfree(f_bmp);
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return res; //BMP显示结束.
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}
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//小尺寸的bmp解码,解码filename这个BMP文件
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//filename:包含路径的文件名
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//x,y,width,height:显示区域大小(在区域正中央显示)
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//acolor:附加的alphablend的颜色(这个仅对32位色bmp有效!!!)
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//mode:模式(除了bit5,其他的均只对32位色bmp有效!!!)
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// bit[7:6]:0,仅使用图片本身和底色alphablend;
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// 1,仅图片和acolor进行alphablend,并且不适用附加的透明度;
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// 2,底色,acolor,图片,一起进行alphablend;
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// bit5:保留
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// bit4~0:0~31,使用附加alphablend的透明程度
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//返回值:0,成功;
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// 其他,错误码.
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/*
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u8 minibmp_decode(u8 *filename,u16 x,u16 y,u16 width,u16 height,u16 acolor,u8 mode)//尺寸小于240*320的bmp图片解码.
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{
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FIL* f_bmp;
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u16 br;
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u8 color_byte;
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u16 tx,ty,color;
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//tx,ty的实际坐标
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u8 res;
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u16 i,j;
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u8 *databuf; //数据读取存 放地址
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u16 readlen=BMP_DBUF_SIZE;//一次从SD卡读取的字节数长度,不能小于LCD宽度*3!!!
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u8 *bmpbuf; //数据解码地址
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u8 biCompression=0; //记录压缩方式
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u16 rowcnt; //一次读取的行数
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u16 rowlen; //水平方向字节数
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u16 rowpix=0; //水平方向像素数
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u8 rowadd; //每行填充字节数
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u16 tmp_color;
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u8 alphabend=0xff; //代表透明色为0，完全不透明
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u8 alphamode=mode>>6; //得到模式值,0/1/2
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BITMAPINFO *pbmp; //临时指针
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//得到窗体尺寸
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picinfo.S_Height=height;
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picinfo.S_Width=width;
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#if BMP_USE_MALLOC == 1 //使用malloc
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databuf=(u8*)pic_memalloc(readlen); //开辟readlen字节的内存区域
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if(databuf==NULL)return PIC_MEM_ERR; //内存申请失败.
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f_bmp=(FIL *)pic_memalloc(sizeof(FIL)); //开辟FIL字节的内存区域
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if(f_bmp==NULL) //内存申请失败.
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{
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pic_memfree(databuf);
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return PIC_MEM_ERR;
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}
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#else
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databuf=bmpreadbuf;
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f_bmp=&f_bfile;
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#endif
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res=f_open(f_bmp,(const TCHAR*)filename,FA_READ);//打开文件
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if(res==0)//打开成功.
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{
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f_read(f_bmp,databuf,sizeof(BITMAPINFO),(UINT*)&br);//读出BITMAPINFO信息
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pbmp=(BITMAPINFO*)databuf; //得到BMP的头部信息
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color_byte=pbmp->bmiHeader.biBitCount/8; //彩色位 16/24/32
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biCompression=pbmp->bmiHeader.biCompression;//压缩方式
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picinfo.ImgHeight=pbmp->bmiHeader.biHeight; //得到图片高度
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picinfo.ImgWidth=pbmp->bmiHeader.biWidth; //得到图片宽度
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//水平像素必须是4的倍数!!
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if((picinfo.ImgWidth*color_byte)%4)rowlen=((picinfo.ImgWidth*color_byte)/4+1)*4;
|
|||
|
|
else rowlen=picinfo.ImgWidth*color_byte;
|
|||
|
|
rowadd=rowlen-picinfo.ImgWidth*color_byte; //每行填充字节数
|
|||
|
|
//开始解码BMP
|
|||
|
|
color=0;//颜色清空
|
|||
|
|
tx=0 ;
|
|||
|
|
ty=picinfo.ImgHeight-1;
|
|||
|
|
if(picinfo.ImgWidth<=picinfo.S_Width&&picinfo.ImgHeight<=picinfo.S_Height)
|
|||
|
|
{
|
|||
|
|
x+=(picinfo.S_Width-picinfo.ImgWidth)/2; //偏移到正中央
|
|||
|
|
y+=(picinfo.S_Height-picinfo.ImgHeight)/2; //偏移到正中央
|
|||
|
|
rowcnt=readlen/rowlen; //一次读取的行数
|
|||
|
|
readlen=rowcnt*rowlen; //一次读取的字节数
|
|||
|
|
rowpix=picinfo.ImgWidth; //水平像素数就是宽度
|
|||
|
|
f_lseek(f_bmp,pbmp->bmfHeader.bfOffBits); //偏移到数据起始位置
|
|||
|
|
while(1)
|
|||
|
|
{
|
|||
|
|
res=f_read(f_bmp,databuf,readlen,(UINT *)&br); //读出readlen个字节
|
|||
|
|
bmpbuf=databuf; //数据首地址
|
|||
|
|
if(br!=readlen)rowcnt=br/rowlen; //最后剩下的行数
|
|||
|
|
if(color_byte==3) //24位BMP图片
|
|||
|
|
{
|
|||
|
|
for(j=0;j<rowcnt;j++) //每次读到的行数
|
|||
|
|
{
|
|||
|
|
for(i=0;i<rowpix;i++)//写一行像素
|
|||
|
|
{
|
|||
|
|
color=(*bmpbuf++)>>3; //B
|
|||
|
|
color+=((u16)(*bmpbuf++)<<3)&0X07E0; //G
|
|||
|
|
color+=(((u16)*bmpbuf++)<<8)&0XF800; //R
|
|||
|
|
pic_phy.draw_point(x+tx,y+ty,color);//显示图片
|
|||
|
|
tx++;
|
|||
|
|
}
|
|||
|
|
bmpbuf+=rowadd;//跳过填充区
|
|||
|
|
tx=0;
|
|||
|
|
ty--;
|
|||
|
|
}
|
|||
|
|
}else if(color_byte==2)//16位BMP图片
|
|||
|
|
{
|
|||
|
|
for(j=0;j<rowcnt;j++)//每次读到的行数
|
|||
|
|
{
|
|||
|
|
if(biCompression==BI_RGB)//RGB:5,5,5
|
|||
|
|
{
|
|||
|
|
for(i=0;i<rowpix;i++)
|
|||
|
|
{
|
|||
|
|
color=((u16)*bmpbuf&0X1F); //R
|
|||
|
|
color+=(((u16)*bmpbuf++)&0XE0)<<1; //G
|
|||
|
|
color+=((u16)*bmpbuf++)<<9; //R,G
|
|||
|
|
pic_phy.draw_point(x+tx,y+ty,color);//显示图片
|
|||
|
|
tx++;
|
|||
|
|
}
|
|||
|
|
}else //RGB 565
|
|||
|
|
{
|
|||
|
|
for(i=0;i<rowpix;i++)
|
|||
|
|
{
|
|||
|
|
color=*bmpbuf++; //G,B
|
|||
|
|
color+=((u16)*bmpbuf++)<<8; //R,G
|
|||
|
|
pic_phy.draw_point(x+tx,y+ty,color);//显示图片
|
|||
|
|
tx++;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
bmpbuf+=rowadd;//跳过填充区
|
|||
|
|
tx=0;
|
|||
|
|
ty--;
|
|||
|
|
}
|
|||
|
|
}else if(color_byte==4) //32位BMP图片
|
|||
|
|
{
|
|||
|
|
for(j=0;j<rowcnt;j++) //每次读到的行数
|
|||
|
|
{
|
|||
|
|
for(i=0;i<rowpix;i++)
|
|||
|
|
{
|
|||
|
|
color=(*bmpbuf++)>>3; //B
|
|||
|
|
color+=((u16)(*bmpbuf++)<<3)&0X07E0; //G
|
|||
|
|
color+=(((u16)*bmpbuf++)<<8)&0XF800; //R
|
|||
|
|
alphabend=*bmpbuf++; //ALPHA通道
|
|||
|
|
if(alphamode!=1) //需要读取底色
|
|||
|
|
{
|
|||
|
|
tmp_color=pic_phy.read_point(x+tx,y+ty);//读取颜色
|
|||
|
|
if(alphamode==2)//需要附加的alphablend
|
|||
|
|
{
|
|||
|
|
tmp_color=piclib_alpha_blend(tmp_color,acolor,mode&0X1F); //与指定颜色进行blend
|
|||
|
|
}
|
|||
|
|
color=piclib_alpha_blend(tmp_color,color,alphabend/8); //和底色进行alphablend
|
|||
|
|
}else tmp_color=piclib_alpha_blend(acolor,color,alphabend/8); //与指定颜色进行blend
|
|||
|
|
pic_phy.draw_point(x+tx,y+ty,color);//显示图片
|
|||
|
|
tx++;//x轴增加一个像素
|
|||
|
|
}
|
|||
|
|
bmpbuf+=rowadd;//跳过填充区
|
|||
|
|
tx=0;
|
|||
|
|
ty--;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
if(br!=readlen||res)break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
f_close(f_bmp);//关闭文件
|
|||
|
|
}else res=PIC_SIZE_ERR;//图片尺寸错误
|
|||
|
|
#if BMP_USE_MALLOC == 1 //使用malloc
|
|||
|
|
pic_memfree(databuf);
|
|||
|
|
pic_memfree(f_bmp);
|
|||
|
|
#endif
|
|||
|
|
return res;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
*/
|
|||
|
|
//BMP编码函数
|
|||
|
|
//将当前LCD屏幕的指定区域截图,存为16位格式的BMP文件 RGB565格式.
|
|||
|
|
//保存为rgb565则需要掩码,需要利用原来的调色板位置增加掩码.这里我们已经增加了掩码.
|
|||
|
|
//保存为rgb555格式则需要颜色转换,耗时间比较久,所以保存为565是最快速的办法.
|
|||
|
|
//filename:存放路径
|
|||
|
|
//x,y:在屏幕上的起始坐标
|
|||
|
|
//mode:模式.0,仅仅创建新文件的方式编码;1,如果之前存在文件,则覆盖之前的文件.如果没有,则创建新的文件.
|
|||
|
|
//返回值:0,成功;其他,错误码.
|
|||
|
|
u8 bmp_encode(u8 *filename,u16 x,u16 y,u16 width,u16 height,u8 mode)
|
|||
|
|
{
|
|||
|
|
// FIL* f_bmp;
|
|||
|
|
// u16 bmpheadsize; //bmp头大小
|
|||
|
|
// BITMAPINFO hbmp; //bmp头
|
|||
|
|
// u8 res=0;
|
|||
|
|
// u16 tx,ty; //图像尺寸
|
|||
|
|
// u16 *databuf; //数据缓存区地址
|
|||
|
|
// u16 pixcnt; //像素计数器
|
|||
|
|
// u16 bi4width; //水平像素字节数
|
|||
|
|
// if(width==0||height==0)return PIC_WINDOW_ERR; //区域错误
|
|||
|
|
// if((x+width-1)>lcddev.width)return PIC_WINDOW_ERR; //区域错误
|
|||
|
|
// if((y+height-1)>lcddev.height)return PIC_WINDOW_ERR; //区域错误
|
|||
|
|
//
|
|||
|
|
//#if BMP_USE_MALLOC == 1 //使用malloc
|
|||
|
|
// databuf=(u16*)pic_memalloc(1024); //开辟至少bi4width大小的字节的内存区域 ,对240宽的屏,480个字节就够了.
|
|||
|
|
// if(databuf==NULL)return PIC_MEM_ERR; //内存申请失败.
|
|||
|
|
// f_bmp=(FIL *)pic_memalloc(sizeof(FIL)); //开辟FIL字节的内存区域
|
|||
|
|
// if(f_bmp==NULL) //内存申请失败.
|
|||
|
|
// {
|
|||
|
|
// pic_memfree(databuf);
|
|||
|
|
// return PIC_MEM_ERR;
|
|||
|
|
// }
|
|||
|
|
//#else
|
|||
|
|
// databuf=(u16*)bmpreadbuf;
|
|||
|
|
// f_bmp=&f_bfile;
|
|||
|
|
//#endif
|
|||
|
|
// bmpheadsize=sizeof(hbmp);//得到bmp文件头的大小
|
|||
|
|
// mymemset((u8*)&hbmp,0,sizeof(hbmp));//置零空申请到的内存.
|
|||
|
|
// hbmp.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);//信息头大小
|
|||
|
|
// hbmp.bmiHeader.biWidth=width; //bmp的宽度
|
|||
|
|
// hbmp.bmiHeader.biHeight=height; //bmp的高度
|
|||
|
|
// hbmp.bmiHeader.biPlanes=1; //恒为1
|
|||
|
|
// hbmp.bmiHeader.biBitCount=16; //bmp为16位色bmp
|
|||
|
|
// hbmp.bmiHeader.biCompression=BI_BITFIELDS;//每个象素的比特由指定的掩码决定。
|
|||
|
|
// hbmp.bmiHeader.biSizeImage=hbmp.bmiHeader.biHeight*hbmp.bmiHeader.biWidth*hbmp.bmiHeader.biBitCount/8;//bmp数据区大小
|
|||
|
|
//
|
|||
|
|
// hbmp.bmfHeader.bfType=((u16)'M'<<8)+'B';//BM格式标志
|
|||
|
|
// hbmp.bmfHeader.bfSize=bmpheadsize+hbmp.bmiHeader.biSizeImage;//整个bmp的大小
|
|||
|
|
// hbmp.bmfHeader.bfOffBits=bmpheadsize;//到数据区的偏移
|
|||
|
|
|
|||
|
|
// hbmp.RGB_MASK[0]=0X00F800; //红色掩码
|
|||
|
|
// hbmp.RGB_MASK[1]=0X0007E0; //绿色掩码
|
|||
|
|
// hbmp.RGB_MASK[2]=0X00001F; //蓝色掩码
|
|||
|
|
|
|||
|
|
// if(mode==1)res=f_open(f_bmp,(const TCHAR*)filename,FA_READ|FA_WRITE);//尝试打开之前的文件
|
|||
|
|
// if(mode==0||res==0x04)res=f_open(f_bmp,(const TCHAR*)filename,FA_WRITE|FA_CREATE_NEW);//模式0,或者尝试打开失败,则创建新文件
|
|||
|
|
// if((hbmp.bmiHeader.biWidth*2)%4)//水平像素(字节)不为4的倍数
|
|||
|
|
// {
|
|||
|
|
// bi4width=((hbmp.bmiHeader.biWidth*2)/4+1)*4;//实际要写入的宽度像素,必须为4的倍数.
|
|||
|
|
// }else bi4width=hbmp.bmiHeader.biWidth*2; //刚好为4的倍数
|
|||
|
|
// if(res==FR_OK)//创建成功
|
|||
|
|
// {
|
|||
|
|
// res=f_write(f_bmp,(u8*)&hbmp,bmpheadsize,&bw);//写入BMP首部
|
|||
|
|
// for(ty=y+height-1;hbmp.bmiHeader.biHeight;ty--)
|
|||
|
|
// {
|
|||
|
|
// pixcnt=0;
|
|||
|
|
// for(tx=x;pixcnt!=(bi4width/2);)
|
|||
|
|
// {
|
|||
|
|
// if(pixcnt<hbmp.bmiHeader.biWidth)databuf[pixcnt]=LCD_ReadPoint(tx,ty);//读取坐标点的值
|
|||
|
|
// else databuf[pixcnt]=0Xffff;//补充白色的像素.
|
|||
|
|
// pixcnt++;
|
|||
|
|
// tx++;
|
|||
|
|
// }
|
|||
|
|
// hbmp.bmiHeader.biHeight--;
|
|||
|
|
// res=f_write(f_bmp,(u8*)databuf,bi4width,&bw);//写入数据
|
|||
|
|
// }
|
|||
|
|
// f_close(f_bmp);
|
|||
|
|
// }
|
|||
|
|
//#if BMP_USE_MALLOC == 1 //使用malloc
|
|||
|
|
// pic_memfree(databuf);
|
|||
|
|
// pic_memfree(f_bmp);
|
|||
|
|
//#endif
|
|||
|
|
// return res;
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|