BMP图像的读

第1关：1位黑白BMP图像的读

#include "BMP.h"


BMP_Image* BMP_LoadImage(char* path)
{
    
    

    BMP_BitMapFileHeader bmpFileHeader;
    BMP_BitMapInfoHeader bmpInfoHeader;
    BMP_RgbQuad* quad;
    BMP_Image* bmpImg;

    FILE* pFile;

    int width = 0;
    int height = 0;
	int offset;
    unsigned char pixVal;

    int i, j, k;
    bmpImg = (BMP_Image*)malloc(sizeof(BMP_Image));
    pFile = fopen(path, "rb");
    if (!pFile)
    {
    
    
        free(bmpImg);
        return NULL;
    }

    fread(&bmpFileHeader, sizeof(BMP_BitMapFileHeader), 1, pFile);


    fread(&bmpInfoHeader, sizeof(BMP_BitMapInfoHeader), 1, pFile);

        if (bmpInfoHeader.biBitCount == 1)
        {
    
    
            width = bmpInfoHeader.biWidth;
            height = bmpInfoHeader.biHeight;

            bmpImg->width = width;
            bmpImg->height = height;
            bmpImg->biBitCount = 1;
            bmpImg->imageRgbQuad = (BMP_RgbQuad*)malloc(sizeof(BMP_RgbQuad)*2);//±äÁ¿·ÖÅäÄÚ´æ
            bmpImg->imageData = (unsigned char*)malloc(sizeof(unsigned char)*width*height/8);
            quad = (BMP_RgbQuad*)malloc(sizeof(BMP_RgbQuad)*2);//¶Á³öbmpԭͼµ÷É«°åÖµ
            fread(quad, sizeof(BMP_RgbQuad), 2, pFile);

			for(i=0;i<2;i++)//½«Ô­Í¼µ÷É«°åÖµ¸³Öµ¸øеıäÁ¿
			{
    
    
 		     bmpImg->imageRgbQuad[i].rgbBlue = quad[i].rgbBlue;
			 bmpImg->imageRgbQuad[i].rgbGreen = quad[i].rgbGreen;
 		     bmpImg->imageRgbQuad[i].rgbRed = quad[i].rgbRed;
 		     bmpImg->imageRgbQuad[i].rgbReserved = quad[i].rgbReserved;
            }

            for (i=0; i<height; i++)//°´Ðò¶Á³öbmpÿ¸ö×Ö½Ú°´´ÓÏÂÍùÉϵÄ˳Ðò¶Á³ö´æ´¢
            {
    
    
                for (j=0; j<width/8; j++)
                {
    
    
					fread(&pixVal, sizeof(unsigned char), 1, pFile);
					/********* Begin *********/
                    bmpImg->imageData[(height-1-i)*width/8+j] = pixVal ;



					/********* End *********/
                }
            }
        }
    return bmpImg;
}

第2关：8位灰度BMP图像的读

#include "BMP.h"


BMP_Image* BMP_LoadImage(char* path)
{
    
    

    BMP_BitMapFileHeader bmpFileHeader;
    BMP_BitMapInfoHeader bmpInfoHeader;
    BMP_RgbQuad* quad;
    BMP_Image* bmpImg;

    FILE* pFile;

    int width = 0;
    int height = 0;

    unsigned char pixVal;

    int i, j, k;
    bmpImg = (BMP_Image*)malloc(sizeof(BMP_Image));
    pFile = fopen(path, "rb");
    if (!pFile)
    {
    
    
        free(bmpImg);
        return NULL;
    }

        fread(&bmpFileHeader, sizeof(BMP_BitMapFileHeader), 1, pFile);

        fread(&bmpInfoHeader, sizeof(BMP_BitMapInfoHeader), 1, pFile);

        if (bmpInfoHeader.biBitCount == 8)
        {
    
    
            width = bmpInfoHeader.biWidth;
            height = bmpInfoHeader.biHeight;

            bmpImg->width = width;
            bmpImg->height = height;
            bmpImg->biBitCount = 8;

            bmpImg->imageRgbQuad = (BMP_RgbQuad*)malloc(sizeof(BMP_RgbQuad)*256);
            bmpImg->imageData = (unsigned char*)malloc(sizeof(unsigned char)*width*height);

            quad = (BMP_RgbQuad*)malloc(sizeof(BMP_RgbQuad)*256);
            fread(quad, sizeof(BMP_RgbQuad), 256, pFile);
			for(i=0;i<256;i++)
			{
    
    
 		     bmpImg->imageRgbQuad[i].rgbBlue = quad[i].rgbBlue;
			 bmpImg->imageRgbQuad[i].rgbGreen = quad[i].rgbGreen;
 		     bmpImg->imageRgbQuad[i].rgbRed = quad[i].rgbRed;
 		     bmpImg->imageRgbQuad[i].rgbReserved = quad[i].rgbReserved;
            }

            for (i=0; i<height; i++)//°´Ðò¶Á³öbmpÿ¸ö×Ö½Ú°´´ÓÏÂÍùÉϵÄ˳Ðò¶Á³ö´æ´¢
            {
    
    
                for (j=0; j<width; j++)
                {
    
    
                    fread(&pixVal, sizeof(unsigned char), 1, pFile);
					/********* Begin *********/
                    bmpImg->imageData[(height-1-i)*width+j] = pixVal;



					/********* End *********/
                }
            }
        }
    return bmpImg;
}

第3关：24位彩色BMP图像的读

#include "BMP.h"


BMP_Image* BMP_LoadImage(char* path)
{
    
    

    BMP_BitMapFileHeader bmpFileHeader;
    BMP_BitMapInfoHeader bmpInfoHeader;
    BMP_RgbQuad* quad;
    BMP_Image* bmpImg;

    FILE* pFile;

    int width = 0;
    int height = 0;
	int offset;
    unsigned char pixVal;

    int i, j, k;
    bmpImg = (BMP_Image*)malloc(sizeof(BMP_Image));
    pFile = fopen(path, "rb");
    if (!pFile)
    {
    
    
        free(bmpImg);
        return NULL;
    }

        fread(&bmpFileHeader, sizeof(BMP_BitMapFileHeader), 1, pFile);
        fread(&bmpInfoHeader, sizeof(BMP_BitMapInfoHeader), 1, pFile);
    if (bmpInfoHeader.biBitCount == 24)
        {
    
    
            width = bmpInfoHeader.biWidth;
            height = bmpInfoHeader.biHeight;

            bmpImg->width = width;
            bmpImg->height = height;
            bmpImg->biBitCount = 24;
            bmpImg->imageData = (unsigned char*)malloc(sizeof(unsigned char)*width*3*height);

            offset = (3*width)%4;
            if (offset != 0)
            {
    
    
                offset = 4 - offset;
            }
            for (i=0; i<height; i++)//°´Ðò¶Á³öbmpÿ¸ö×Ö½Ú°´´ÓÏÂÍùÉϵÄ˳Ðò¶Á³ö´æ´¢
            {
    
    
                for (j=0; j<width; j++)
                {
    
    
                    for (k=0; k<3; k++)
                    {
    
    
                        fread(&pixVal, sizeof(unsigned char), 1, pFile);
						/********* Begin *********/
                         bmpImg->imageData[(height-1-i)*width*3+j*3+k] = pixVal;



						/********* End *********/
                    }
                }
                if (offset != 0)
                {
    
    
                    for (j=0; j<offset; j++)
                    {
    
    
                        fread(&pixVal, sizeof(unsigned char), 1, pFile);
                    }
                }
			}
		}
    return bmpImg;
}

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