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#include "ndstool.h"
#include "raster.h"
int CRaster::LoadBMP(char *filename)
{
// open file
FILE *f = fopen(filename, "rb");
if (!f) { fprintf(stderr, "Could not open '%s'.\n", filename); return -1; }
// load bitmap fileheader & infoheader
BITMAPFILEHEADER bmfh;
fread((char*)&bmfh, 1, sizeof(bmfh), f);
BITMAPINFO bmi;
fread((char*)&bmi, 1, sizeof(bmi), f);
BITMAPINFOHEADER &bmih = bmi.bmiHeader;
memcpy(palette, bmi.bmiColors, sizeof(palette));
// check filetype signature
if ((bmfh.bfType[0] != 'B') || (bmfh.bfType[1] != 'M')) { fprintf(stderr, "Not a bitmap file.\n"); return -2; }
if (bmih.biBitCount > 8) { fprintf(stderr, "Bitmap must have a palette.\n"); return -3; }
// assign some short variables:
width = bmih.biWidth;
height = (bmih.biHeight > 0) ? (int)bmih.biHeight : -(int)bmih.biHeight; // absoulte value
int pitch = width * bmih.biBitCount / 8;
pitch += (4 - pitch%4) % 4;
// load raster
unsigned int pixelsPerByte = 8 / bmih.biBitCount;
unsigned int biBitCount_mask = (1<<bmih.biBitCount)-1;
raster = new unsigned char [width * height];
for (unsigned int y=0; y<height; y++)
{
if (bmih.biHeight > 0) // if height is positive the bmp is bottom-up, read it reversed
fseek(f, bmfh.bfOffBits + pitch*(height-1-y), SEEK_SET);
else
fseek(f, bmfh.bfOffBits + pitch*y, SEEK_SET);
for (unsigned int x=0; x<width; x+=pixelsPerByte)
{
unsigned char data = fgetc(f);
unsigned int shift = 8;
for (unsigned int p=0; p<pixelsPerByte; p++)
{
shift -= bmih.biBitCount;
(*this)[y][x+p] = data >> shift & biBitCount_mask;
}
}
}
fclose(f);
return 0;
}
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