LCD驱动(三)：bmp图片的显示方法
====================== 目标 =====================
在lcd屏幕上显示bmp图片
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一、问题解答
1.在计算机中图片是如何表示的？也就是用什么码来表示的？
答：十六进制码。
2.如何加载图片？
用以指针定位到你存储图片的地方。图片的编码信息存储实质就是一数组。取点，然后显示即可。代码见后面。
3.静态显示，动态显示
答：静态显示已实现。类似于汉字显示，即点阵。数码管显示，玩过吧？
动态显示，还没实现。
4.图片作为背景及其它
答：作为背景色，前景色，透明，实体等还有点不明白。
5.没见到bmp图片啊，难道将其转化为编码了？
答：是的，通过一个DOS软件可以将bmp图片转化为十六进制。如下图（部分）：
#include "bmp.h"char cPicStart[MAXPIX128X128]={0xAB,0x42,0x34,0xAB,0x42,0x34,0xAA,0x41,0x33,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x40,0x32,0xAA,0x41,0x33,0xAA,0x41,0x33,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x40,0x32,0xA9,0x42,0x2F,0xAA,0x44,0x2D,0xAC,0x48,0x2C,0xAD,0x48,0x2F,0xAE,0x49,0x30,0xAD,0x47,0x31,0xAD,0x47,0x31,0xAF,0x48,0x35,0xB0,0x49,0x36,0xAE,0x47,0x34,0xAB,0x44,0x31,0xAA,0x44,0x2E,0xAD,0x47,0x30,0xAC,0x46,0x2F,0xAA,0x45,0x2C,0xAE,0x4A,0x2E,0xB5,0x51,0x34,0xAF,0x4D,0x2F,0xB6,0x57,0x36,0xBC,0x5F,0x40,0xB7,0x5C,0x3D,0xAC,0x50,0x33,0xA4,0x46,0x29,0xA3,0x42,0x28,0xA8,0x43,0x2A,0xB8,0x4C,0x34,0xBD,0x4F,0x37,0xC2,0x54,0x3A,0xC5,0x5A,0x3F,0xC7,0x63,0x47,0xCA,0x6C,0x4F,0xCA,0x70,0x51,0xC9,0x6F,0x50,0xC2,0x5D,0x3D,0xC4,0x5D,0x3D,0xC8,0x60,0x43,0xC7,0x63,0x46,0xBE,0x5D,0x43,0xB3,0x56,0x3C,0xB2,0x5A,0x42,0xB8,0x63,0x4D,0xB5,0x66,0x51,0xBF,0x73,0x60,0xCE,0x86,0x75,0xD5,0x90,0x7F,0xCE,0x8D,0x7F,0xC8,0x8B,0x7D,0xD6,0x98,0x8D,0xE5,0xAA,0xA0,0xEC,0xAF,0xAB,0xE9,0xB2,0xAF,0xE8,0xBB,0xB8,0xE6,0xC3,0xBF,0xDC,0xC3,0xBF,0xD0,0xC2,0xBC,0xD3,0xC8,0xC4,0xDC,0xD4,0xCD,0xE2,0xD6,0xD0,0xE4,0xCF,0xC7,0xCC,0xA8,0xA0,0xD2,0x9F,0x95,0xF3,0xAB,0xA3,0xD7,0x82,0x78,0xAD,0x4B,0x43,0xB6,0x4E,0x41,0xAE,0x47,0x34,0xAF,0x47,0x30,0xAD,0x45,0x2E,0xAB,0x43,0x2C,0xAA,0x42,0x2B,0xAA,0x42,0x2B,0xAB,0x43,0x2C,0xAB,0x43,0x2C,0xAE,0x47,0x2E,0xAE,0x47,0x2E,0xAE,0x47,0x2E,0xAD,0x46,0x2D,0xAD,0x46,0x2D,0xAC,0x45,0x2C,
6.如何用txt文本文件写一张图片?(就是说在txt里写图片编码,然后存为bmp图片).如何将bmp图片转化为txt文本文件？
答：具体可看《bmp图片介绍》，百度下大把，有关于文件格式，信息头格式，调色板等的说明。
7.txt文本文件的编码方式是怎样的？如何索引？显示点阵的方法（操作）？
二、代码注释
1）bmp是以BGR888的格式存储的。若要在LCD上显示，则要将其转化为RGB565格式。具体函数如下：
//将bgr888格式转换成rgb565格式，ColorAdjust颜色调节
//uctype为转换颜色类型，0为前景颜色，1为背景颜色
//lx-2011-7-19
void BGR888TRGB565(char *cBGR888,int ColorAdjust,BYTE uctype)
{
LCDSetColorAdjust(cBGR888,ColorAdjust);
if(uctype==0)
{
ucFrontColorSet1= (cBGR888[2]+RedAdjust)&0xf8;
ucFrontColorSet1+=(cBGR888[1]+GreenAdjust)>>5;
ucFrontColorSet2=(cBGR888[0]+BlueAdjust)>>3;
ucFrontColorSet2+=((cBGR888[1]+GreenAdjust)& 0x1c)<<3;
}
else if(uctype==1)
{
ucBackColorSet1= (cBGR888[2]+RedAdjust)&0xf8; //移位操作，取BGR888[2]（代表RED)格式中的前5位，作为RGB格式set1字节R
ucBackColorSet1+=(cBGR888[1]+GreenAdjust)>>5; //
ucBackColorSet2=(cBGR888[0]+BlueAdjust)>>3;
ucBackColorSet2+=((cBGR888[1]+GreenAdjust)& 0x1c)<<3;
}
}
感想：发现用语言描述力不从心啊，下周装个visio才行，一张图明矣。
2）
//LightAdjust颜色调整 取值范围-16(to ColorR)~+16(to ColorL), 0为保持原色。void LCDSetColorAdjust(char *cBGRPix,int ColorAdjust) { if(ColorAdjust>0) { RedAdjust=ColorAdjust*(ColorL[2]-cBGRPix[2])/16; GreenAdjust=ColorAdjust*(ColorL[1]-cBGRPix[1])/16; BlueAdjust=ColorAdjust*(ColorL[0]-cBGRPix[0])/16; } else if(ColorAdjust<0) { RedAdjust=ColorAdjust*(cBGRPix[2]-ColorR[2])/16; GreenAdjust=ColorAdjust*(cBGRPix[1]-ColorR[1])/16; BlueAdjust=ColorAdjust*(cBGRPix[0]-ColorR[0])/16; } else if(ColorAdjust==0) { RedAdjust=0; GreenAdjust=0; BlueAdjust=0; } }
3）看代码时，赋值实例分析是个好方法。减少抽象程度。请看以下代码：
/*用以静态加载图像，并实现颜色渐变*/void LCDSetButton(BYTE ucStartx,BYTE ucStarty,BYTE ucLen,BYTE ucWidth,int ColorAdjust,BYTE ucType){ int i,k,step; if(ucType==TRANS) { LCDShowPic(cPicmy1Start,ucStartx,ucStarty,ucLen,ucWidth,ColorAdjust); } else if(ucType==TRANSA) //透明横向渐变 { LCDSetAdjustColorScop(BLACK,BLUED,BLACK); step=ucLen/32; if(step>=1) AColorAdjust=16; else //uclen<32，取颜色渐变因子为8.否则是16 { step=1; AColorAdjust=8; } for(i=0;i<ucLen;i++) { LCDShowPic(cPicBackGround,ucStartx+i,ucStarty,1,ucWidth,AColorAdjust); //以uc=32为界，调色因子在变化 if(i%step==0) //这句理论上不好分析。因为 step=ucLen/32;但假设ucLen=112,就清晰多了。 { k++; if(AColorAdjust>-16) AColorAdjust--; } } LCDSetDefaultAdjustColor(); } else if(ucType==TRANSB) //透明纵向渐变 { LCDSetAdjustColorScop(BLACK,BLUED,BLACK); step=ucWidth/32; if(step>=1) AColorAdjust=16; else { step=1; AColorAdjust=8; } for(i=0;i<ucWidth;i++) { LCDShowPic(cPicmy1Start,ucStartx,ucStarty+i,ucLen,1,AColorAdjust); if(i%step==0) { if(AColorAdjust>-14) AColorAdjust--; } } LCDSetDefaultAdjustColor(); } else if(ucType==SOLIDA) //非透明横向渐变 { LCDSetAdjustColorScop(BLACK,ORANGE,BLACK); step=ucLen/16; AColorAdjust=8; for(i=0;i<ucLen;i++) { LCDSetLine(ucStartx+i,ucStarty,ucWidth,LIGHTCHANGE,1); if(i%step==0) { k++; AColorAdjust--; } } LCDSetDefaultAdjustColor(); } else if(ucType==SOLIDB) //非透明纵向渐变 { LCDSetAdjustColorScop(WHITE,BLUED,BLACK); step=ucWidth/16; AColorAdjust=8; for(i=0;i<ucWidth;i++) { LCDSetLine(ucStartx,ucStarty+i,ucLen,LIGHTCHANGE,0); if(i%step==0) { AColorAdjust--; } } LCDSetDefaultAdjustColor(); } }
4）
void LCDShowPic(char *cpBmp,BYTE ucStartx,BYTE ucStarty,BYTE ucLen,BYTE ucWidth,int ColorAdjust) //用来显示静态bmp图片{ DWORD dwStartPix=0; int i,j; for(i=0;i<ucWidth;i++) { dwStartPix=((127-ucStarty-i)*128+ucStartx)*3; //公式，但不明其义索引含义，有明白的告诉声啊。*3是因为BGR888格式每次要取3个字节。 for(j=0;j<ucLen;j++) { BGR888TRGB565(&cpBmp[dwStartPix],ColorAdjust,0); Xadd(ucStartx+j,ucStartx+j); Yadd(ucStarty+i,ucStarty+i); LCDCOM_MASTER(0x2C); LCDDATA_MASTER(ucFrontColorSet1); LCDDATA_MASTER(ucFrontColorSet2); dwStartPix+=3; } }}
四、MIT方法实践
1.真他妈删得我烦啊。C里能否建立个类，否则想扩展或裁判时，乱。这往往让人失去信心。问下高手如何管理这些类的？目的是为了便于调试，可是调试成功后我又不想要那些没用的注释的代码。
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乱无条理，让人失去信心，这是最可怕的
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2.如何编写出没有压力的，健康健壮的程序？整洁干净的程序？易于裁减，易于扩展的程序？C++是解决之道吗？如何在C里实现呢？（多看LINUX源码，看人家是如何实现的？）
3.知其所以然（必要够用为原则），清晰可视化地调试
4.如何弄易于修改和维护呢？不然搞死人，累死人。会组织，随着工作你会越轻松，没管理没系统，很快将出现学习瓶颈。
5.数组检索：线性代数，回去温习聆听下MIT（百度检索，学习下华工的百度师姐，人家20万年薪啊）
抽象：偏移量
有了数学的技巧（几何，代数）的技巧，助编程更简洁轻松
6.全面细致地思考（一次性准确搞定，提高效率），在大脑里模拟运行先。而不只是胡乱在调试。