Quartus を使用して Altera の DE12-115 マイクロプロセッサに取り組んでいます。組み込みの VGA 接続を使用してモニターに BMP 画像を表示するには、まず BMP 画像を MIF 形式に変換する必要があります。MIF 形式は、RGB カラー コードを使用して各ピクセルのアドレスと各色のエイリアスを指定するルックアップ テーブルに他なりません。サンプル MIF ファイルの形状は次のとおりです。
DEPTH = 32; -- The size of data in bits
WIDTH = 8; -- The size of memory in words
ADDRESS_RADIX = HEX; -- The radix for address values
DATA_RADIX = BIN; -- The radix for data values
CONTENT -- start of (address : data pairs)
BEGIN
00 : 00000000; -- memory address : data
01 : 00000001;
02 : 00000010;
03 : 00000011;
04 : 00000100;
05 : 00000101;
06 : 00000110;
07 : 00000111;
08 : 00001000;
09 : 00001001;
0A : 00001010;
0B : 00001011;
0C : 00001100;
END;
自分の画像を上記の形式に変換できるソフトウェアが見つかりません。しかし、それを行う C コードを見つけました。私は C に精通していないので、誰かがコードやライブラリのインポートなどを理解するのを手伝ってくれないかと思っていたので、JAVA に変換できるようになりました。また、誰かが写真から MIF 形式を抽出する方法を説明してくれ、自分のコードをゼロから書くことができれば素晴らしいと思います。Cコードは以下です。よろしくお願いします
// PicTest.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
//#ifndef LaserMaze_Bitmap_h
//#define LaserMaze_Bitmap_h
#pragma pack(2) // Add this
typedef struct
{
unsigned short bfType;
unsigned int bfSize;
unsigned short bfReserved1;
unsigned short bfReserved2;
unsigned int bfOffBits;
} BITMAPFILEHEADER;
#pragma pack() // and this
# define BF_TYPE 0x4D42 /* "MB" */
typedef struct /**** BMP file info structure ****/
{
unsigned int biSize; /* Size of info header */
int biWidth; /* Width of image */
int biHeight; /* Height of image */
unsigned short biPlanes; /* Number of color planes */
unsigned short biBitCount; /* Number of bits per pixel */
unsigned int biCompression; /* Type of compression to use */
unsigned int biSizeImage; /* Size of image data */
int biXPelsPerMeter; /* X pixels per meter */
int biYPelsPerMeter; /* Y pixels per meter */
unsigned int biClrUsed; /* Number of colors used */
unsigned int biClrImportant; /* Number of important colors */
unsigned int RedMask; /* Mask identifying bits of red component */
unsigned int GreenMask; /* Mask identifying bits of green component */
unsigned int BlueMask; /* Mask identifying bits of blue component */
unsigned int AlphaMask; /* Mask identifying bits of alpha component */
unsigned int CSType; /* Color space type */
long RedX; /* X coordinate of red endpoint */
long RedY; /* Y coordinate of red endpoint */
long RedZ; /* Z coordinate of red endpoint */
long GreenX; /* X coordinate of green endpoint */
long GreenY; /* Y coordinate of green endpoint */
long GreenZ; /* Z coordinate of green endpoint */
long BlueX; /* X coordinate of blue endpoint */
long BlueY; /* Y coordinate of blue endpoint */
long BlueZ; /* Z coordinate of blue endpoint */
unsigned int GammaRed; /* Gamma red coordinate scale value */
unsigned int GammaGreen; /* Gamma green coordinate scale value */
unsigned int GammaBlue; /* Gamma blue coordinate scale value */
} BITMAPINFOHEADER;
/*
* Constants for the biCompression field...
*/
# define BI_RGB 0 /* No compression - straight BGR data */
# define BI_RLE8 1 /* 8-bit run-length compression */
# define BI_RLE4 2 /* 4-bit run-length compression */
# define BI_BITFIELDS 3 /* RGB bitmap with RGB masks */
typedef struct /**** Colormap entry structure ****/
{
unsigned char rgbBlue; /* Blue value */
unsigned char rgbGreen; /* Green value */
unsigned char rgbRed; /* Red value */
unsigned char rgbReserved; /* Reserved */
} RGBQUAD;
unsigned char *LoadBitmapFile(char *filename, BITMAPINFOHEADER *bitmapInfoHeader)
{
FILE *filePtr; //our file pointer
BITMAPFILEHEADER bitmapFileHeader; //our bitmap file header
unsigned char *bitmapImage; //store image data int imageIdx=0; //image index counter
unsigned char tempRGB; //our swap variable
//open filename in read binary mode
filePtr = fopen(filename,"rb");
if (filePtr == NULL)
return NULL;
//read the bitmap file header
fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER),1,filePtr);
//verify that this is a bmp file by check bitmap id
if (bitmapFileHeader.bfType !=0x4D42)
{
fclose(filePtr);
return NULL;
}
//read the bitmap info header
fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER),1,filePtr);
//move file point to the begging of bitmap data
fseek(filePtr, bitmapFileHeader.bfOffBits, SEEK_SET);
//allocate enough memory for the bitmap image data
bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage);
//verify memory allocation
if (!bitmapImage)
{
free(bitmapImage);
fclose(filePtr);
return NULL;
}
//read in the bitmap image data
fread(bitmapImage,bitmapInfoHeader->biSizeImage,1,filePtr);
//make sure bitmap image data was read
if (bitmapImage == NULL)
{
fclose(filePtr);
return NULL;
}
//swap the r and b values to get RGB (bitmap is BGR)
/*for (imageIdx = 0,imageIdx < bitmapInfoHeader->biSizeImage;imageIdx+=3)
{
tempRGB = bitmapImage[imageIdx];
bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
bitmapImage[imageIdx + 2] = tempRGB;
}*/
//close file and return bitmap iamge data
fclose(filePtr);
return bitmapImage;
}
double round(double d)
{
return floor(d + 0.5);
}
bool generateMIF(unsigned char *bitmapData, long tSize, char *file)
{
FILE * pFile;
pFile = fopen (file,"w");
if (pFile==NULL)
{
printf("Unable to Open file to write \n");
return 0;
}
char buff[40];
sprintf(buff,"DEPTH = %d;\n",tSize/3);
fputs("WIDTH = 8;\n",pFile);
fputs(buff,pFile);
fputs("ADDRESS_RADIX = HEX;\n",pFile);
fputs("DATA_RADIX = HEX;\n",pFile);
fputs("CONTENT BEGIN\n",pFile);
long ind=0;
long addr=0;
for (ind=tSize-1;ind>=0; ind-=3)
{
unsigned char R=round(bitmapData[ind]/255.0*7.0);
unsigned char G=round(bitmapData[ind-1]/255.0*7.0);
unsigned char B=round(bitmapData[ind-2]/255.0*3.0);
unsigned char Var = R *32 + G *4 + B;
sprintf(buff,"%X : %X ;\n",addr,Var);
fputs(buff,pFile);
addr++;
}
fputs("END;\n",pFile);
fclose (pFile);
}
bool generateLUTMIF(char *file)
{
FILE * pFile;
pFile = fopen (file,"w");
if (pFile==NULL)
{
printf("Unable to Open file to write \n");
return 0;
}
char buff[40];
fputs("WIDTH = 24;\n",pFile);
fputs("DEPTH = 256;\n",pFile);
fputs("ADDRESS_RADIX = HEX;\n",pFile);
fputs("DATA_RADIX = HEX;\n",pFile);
fputs("CONTENT BEGIN\n",pFile);
long ind=0;
long addr=0;
for (ind=0;ind<256; ind++)
{
unsigned char C=ind;
unsigned char R=C >> 5;
R = R* 255/7;
unsigned char G= (C >> 2)&0x07;
G= G* 255 / 7;
unsigned char B=C & 0x3;
B=B*255/3;
sprintf(buff,"%X : %02X%02X%02X ;\n",ind,R,G,B);
fputs(buff,pFile);
addr++;
}
fputs("END;\n",pFile);
fclose (pFile);
}
int _tmain(int argc, _TCHAR* argv[])
{
printf("Reading Image... \n");
BITMAPINFOHEADER bitmapInfoHeader;
unsigned char *bitmapData;
bitmapData = LoadBitmapFile("d:\\back_24.bmp",&bitmapInfoHeader);
long tSize= bitmapInfoHeader.biHeight *bitmapInfoHeader.biWidth * 3 ;//24 bps
generateMIF(bitmapData,tSize,"D:\\backMIF.txt");
generateLUTMIF("D:\\lutMIF.mif");
printf("Done !");
return 0;
}