bmp.c

C大程序 需要解压

#define PALETTE_MASK 0x3c6
#define PALETTE_REGISTER_RD 0x3c7
#define PALETTE_REGISTER_WR 0x3c8
#define PALETTE_DATA 0x3c9

typedef struct BMP_file{
	unsigned int bfType;
	unsigned long bfSize;
	unsigned int Reserved1;
	unsigned int reserved2;
	unsigned long bfOffset;
}
bitmapfile;

typedef struct BMP_info{
	unsigned long biSize;
	unsigned long biWidth;
	unsigned long biHeight;
	unsigned int biPlanes;
	unsigned int biBitCount;
	unsigned long biCompression;
	unsigned long biSizeImage;
	unsigned long biXpolsPerMeter;
	unsigned long biYpelsPerMeter;
	unsigned long biClrUsed;
	unsigned long biClrImportant;
}
bitmapinfo;

typedef struct RGB_BMP_typ{
	unsigned char blue;
	unsigned char green;
	unsigned char red;
	unsigned char reserved;
}
RGB_BMP, *RGB_BMP_ptr;

typedef struct bmp_picture_typ{
	bitmapfile file;
	bitmapinfo info;
	RGB_BMP palette[256];
	char far *buffer;
}
bmp_picture, *bmp_picture_ptr;

void BMP_PaletteRegister(int index, RGB_BMP_ptr color){
	outp(PALETTE_MASK, 0xff);
	outp(PALETTE_REGISTER_WR, index);
	outp(PALETTE_DATA, color->red);
	outp(PALETTE_DATA, color->green);
	outp(PALETTE_DATA, color->blue);
}

void Check_Bmp(bmp_picture_ptr bmp_ptr){
	if(bmp_ptr->file.bfType != 0x4d42){
		printf("Not a BMP file!\n");
		getch();
		exit(1);
	}
	if(bmp_ptr->info.biCompression != 0){
		printf("Can not display a compressed BMP file!\n");
		getch();
		exit(1);
	}
	if(bmp_ptr->info.biBitCount != 8){
		printf("Not a index 16color BMP file!\n");
		getch();
		exit(1);
	}
}

void BMP_Load(char *bmp, bmp_picture *bmp256){
	int i, fp, imgsize;

	if ((fp = open(bmp,O_RDONLY)) == 1) return;

	read(fp, &bmp256->file, sizeof(bitmapfile));
	read(fp, &bmp256->info, sizeof(bitmapinfo));

	Check_Bmp((bmp_picture_ptr)bmp256);

	for (i = 0; i < 256; i++){
		read(fp, &bmp256->palette[i].blue, 1);
		read(fp, &bmp256->palette[i].green, 1);
		read(fp, &bmp256->palette[i].red, 1);
		read(fp, &bmp256->palette[i].reserved, 1);
		bmp256->palette[i].blue = bmp256->palette[i].blue >> 2;
		bmp256->palette[i].green = bmp256->palette[i].green >> 2;
		bmp256->palette[i].red = bmp256->palette[i].red >> 2;
	}
	imgsize = (unsigned)(bmp256->info.biHeight * bmp256->info.biWidth);
	if ((bmp256->buffer = (char far *)farmalloc((long)imgsize)) != NULL)
		_dos_read(fp, bmp256->buffer, imgsize, &i);
	else{
		printf("low memory for BMP!");
		getch();
		exit(1);
	}
	close(fp);
}

void BMP_SetPalette(bmp_picture bmp256){
	int i;

	for (i = 0; i < 256; i++)
		BMP_PaletteRegister(i, (RGB_BMP_ptr)&bmp256.palette[i]);
}

void BMP_Put(bmp_picture bmp256, int x, int y){
	int i, j;

	BMP_SetPalette(bmp256);
	for (i = (int)bmp256.info.biHeight - 1, j = 0; i >= 0; i--, j++)
		if ((y + i >= 0) && (y + i < 200))
		_fmemcpy(&video_buffer[(y + i) * SCREEN_WIDTH + x], &bmp256.buffer[j * bmp256.info.biWidth], bmp256.info.biWidth);
}

void BMP_LoadScreen(char *bmp){
	int i, fp, n;
	bmp_picture bmp256;

	if ((fp = open(bmp,O_RDONLY)) == 1) return;

	read(fp, &bmp256.file, sizeof(bitmapfile));
	read(fp, &bmp256.info, sizeof(bitmapinfo));

	Check_Bmp((bmp_picture_ptr)&bmp256);

	for (i = 0; i < 256; i++){
		read(fp, &bmp256.palette[i].blue, 1);
		read(fp, &bmp256.palette[i].green, 1);
		read(fp, &bmp256.palette[i].red, 1);
		read(fp, &bmp256.palette[i].reserved, 1);
		bmp256.palette[i].blue = bmp256.palette[i].blue >> 2;
		bmp256.palette[i].green = bmp256.palette[i].green >> 2;
		bmp256.palette[i].red = bmp256.palette[i].red >> 2;
	}
	BMP_SetPalette(bmp256);
	for (i=0;i<256;i++)
		BMP_PaletteRegister(i,(RGB_BMP_ptr)&bmp256.palette[i]);
	for (i = SCREEN_HEIGHT - 1; i >= 0; i--)
		_dos_read(fp, &video_buffer[i * SCREEN_WIDTH], SCREEN_WIDTH, &n);
	close(fp);
}

void BMP_DirectShow(char *bmp, int x, int y){
	int i, fp, n;
	bmp_picture bmp256;

	if ((fp = open(bmp,O_RDONLY)) == 1) return;

	read(fp, &bmp256.file, sizeof(bitmapfile));
	read(fp, &bmp256.info, sizeof(bitmapinfo));

	Check_Bmp((bmp_picture_ptr)&bmp256);

	for (i = 0; i < 256; i++){
		read(fp, &bmp256.palette[i].blue, 1);
		read(fp, &bmp256.palette[i].green, 1);
		read(fp, &bmp256.palette[i].red, 1);
		read(fp, &bmp256.palette[i].reserved, 1);
		bmp256.palette[i].blue = bmp256.palette[i].blue >> 2;
		bmp256.palette[i].green = bmp256.palette[i].green >> 2;
		bmp256.palette[i].red = bmp256.palette[i].red >> 2;
	}
	BMP_SetPalette(bmp256);
	for (i=0;i<256;i++)
		BMP_PaletteRegister(i,(RGB_BMP_ptr)&bmp256.palette[i]);
	for (i = bmp256.info.biHeight - 1; i >= 0; i--)
		_dos_read(fp, &video_buffer[(i + y) * SCREEN_WIDTH + x], bmp256.info.biWidth, &n);
	close(fp);
}