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/* bitmap.c
*
* Copyright (C) 2010 dking <dking024@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licens e as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//v1.1
#include "fs_api.h"
#include "bitmap.h"
#include "ds2_malloc.h"
int BMP_read(char* filename, char *buf, unsigned int width, unsigned int height, unsigned int* type)
{
FILE* fp;
BMPHEADER bmp_header;
int flag;
u32 bytepixel;
u32 x, y, sx, sy, m;
unsigned char *dest;
s32 fpos;
unsigned short st[54/2];
fp= fopen(filename, "rb");
if(fp == NULL)
return BMP_ERR_OPENFAILURE;
flag= fread(st, sizeof(st), 1, fp);
if(!flag) {
fclose(fp);
return BMP_ERR_FORMATE;
}
bmp_header.bfType= st[0];
bmp_header.bfSize= st[1] | (st[2]<<16);
bmp_header.bfReserved0= st[3];
bmp_header.bfReserved1= st[4];
bmp_header.bfImgoffst= st[5] | (st[6]<<16);
bmp_header.bfImghead.imHeadsize= st[7] | (st[8]<<16);
bmp_header.bfImghead.imBitmapW= st[9] | (st[10]<<16);
bmp_header.bfImghead.imBitmapH= st[11] | (st[12]<<16);
bmp_header.bfImghead.imPlanes= st[13];
bmp_header.bfImghead.imBitpixel= st[14];
bmp_header.bfImghead.imCompess= st[15] | (st[16]<<16);
bmp_header.bfImghead.imImgsize= st[17] | (st[18]<<16);
bmp_header.bfImghead.imHres= st[19] | (st[20]<<16);
bmp_header.bfImghead.imVres= st[21] | (st[22]<<16);
bmp_header.bfImghead.imColnum= st[23] | (st[24]<<16);
bmp_header.bfImghead.imImcolnum= st[25] | (st[26]<<16);
if(bmp_header.bfType != 0x4D42) { //"BM"
fclose(fp);
return BMP_ERR_FORMATE;
}
if(bmp_header.bfImghead.imCompess != BI_RGB &&
bmp_header.bfImghead.imCompess != BI_BITFIELDS) {
fclose(fp);
return BMP_ERR_NEED_GO_ON; //This funciton now not support...
}
bytepixel= bmp_header.bfImghead.imBitpixel >> 3;
if(bytepixel < 2) { //byte per pixel >= 2
fclose(fp);
return BMP_ERR_NEED_GO_ON; //This funciton now not support...
}
*type = bytepixel;
x= width;
y= height;
sx= bmp_header.bfImghead.imBitmapW;
sy= bmp_header.bfImghead.imBitmapH;
if(x > sx)
x= sx;
if(y > sy)
y= sy;
// Expect a certain amount of bytes and read them all at once.
unsigned int BytesPerLine = (sx * bytepixel + 3) & ~3;
char* FileBuffer = (char*) malloc(BytesPerLine * (sy - 1) + sx * bytepixel);
if (FileBuffer == NULL) {
fclose(fp);
return BMP_ERR_NEED_GO_ON; // Memory allocation error
}
fseek(fp, (s32) bmp_header.bfImgoffst, SEEK_SET);
m = fread(FileBuffer, 1, BytesPerLine * (sy - 1) + sx * bytepixel, fp);
if (m < BytesPerLine * (sy - 1) + sx * bytepixel) {
free(FileBuffer);
fclose(fp);
return BMP_ERR_FORMATE; // incomplete file
}
// Reorder all the bytes, because scanlines are from bottom to top.
for (m = 0; m < y; m++) {
memcpy(buf + m * x * bytepixel, FileBuffer + (sy - m - 1) * BytesPerLine, x * bytepixel);
}
free(FileBuffer);
fclose(fp);
return BMP_OK;
}
/*
* open BMP file
*/
int openBMP(BMPINFO* bmpInfo, const char* file)
{
FILE* fp;
unsigned short st[54/2];
int len;
bmpInfo->fp = NULL;
fp = fopen(file, "r");
if(NULL == fp)
return BMP_ERR_OPENFAILURE;
len = fread((void*)st, 1, sizeof(BMPHEADER), fp);
if(len < sizeof(BMPHEADER)) {
fclose(fp);
return BMP_ERR_FORMATE;
}
bmpInfo->bmpHead.bfType= st[0];
bmpInfo->bmpHead.bfSize= st[1] | (st[2]<<16);
bmpInfo->bmpHead.bfReserved0= st[3];
bmpInfo->bmpHead.bfReserved1= st[4];
bmpInfo->bmpHead.bfImgoffst= st[5] | (st[6]<<16);
bmpInfo->bmpHead.bfImghead.imHeadsize= st[7] | (st[8]<<16);
bmpInfo->bmpHead.bfImghead.imBitmapW= st[9] | (st[10]<<16);
bmpInfo->bmpHead.bfImghead.imBitmapH= st[11] | (st[12]<<16);
bmpInfo->bmpHead.bfImghead.imPlanes= st[13];
bmpInfo->bmpHead.bfImghead.imBitpixel= st[14];
bmpInfo->bmpHead.bfImghead.imCompess= st[15] | (st[16]<<16);
bmpInfo->bmpHead.bfImghead.imImgsize= st[17] | (st[18]<<16);
bmpInfo->bmpHead.bfImghead.imHres= st[19] | (st[20]<<16);
bmpInfo->bmpHead.bfImghead.imVres= st[21] | (st[22]<<16);
bmpInfo->bmpHead.bfImghead.imColnum= st[23] | (st[24]<<16);
bmpInfo->bmpHead.bfImghead.imImcolnum= st[25] | (st[26]<<16);
if(bmpInfo->bmpHead.bfType != 0x4D42) //"BM"
{
fclose(fp);
return BMP_ERR_FORMATE;
}
if(bmpInfo->bmpHead.bfImghead.imCompess != BI_RGB &&
bmpInfo->bmpHead.bfImghead.imCompess != BI_BITFIELDS)
{
fclose(fp);
return BMP_ERR_NEED_GO_ON; //This funciton now not support...
}
bmpInfo->fp = fp;
return BMP_OK;
}
/*
* read pixel form BMP file
*/
int readBMP(BMPINFO* bmpInfo, unsigned int start_x, unsigned int start_y,
unsigned int width, unsigned int height, void* buffer)
{
unsigned int m, n;
unsigned int bmp_w, bmp_h;
int fpos;
unsigned char* dst;
unsigned int bytepixel;
bytepixel = bmpInfo->bmpHead.bfImghead.imBitpixel >> 3;
if(bytepixel < 2) //Not support <2 bytes per pixel now
return -1;
//BMP scan from down to up
bmp_w = bmpInfo->bmpHead.bfImghead.imBitmapW;
bmp_h = bmpInfo->bmpHead.bfImghead.imBitmapH;
if(((start_x +1) > bmp_w) || ((start_y+1) > bmp_h)) return -1;
n = bmp_w - start_x;
if(n > width) n = width; //start_x + width < bmp_w
m = bmp_h - start_y;
if(m > height) m = height; //start_y + height < bmp_h
fpos = (int)bmpInfo->bmpHead.bfImgoffst;
fpos += (((bmp_w*bytepixel+3)>>2)<<2)*(bmp_h - start_y -1) + start_x*bytepixel;
dst = (unsigned char*)buffer;
n *= bytepixel;
while(m--) {
fseek(bmpInfo->fp, fpos, SEEK_SET);
fread(dst, 1, n, bmpInfo->fp);
fpos -= ((bmp_w*bytepixel+3)>>2)<<2;
dst += width*bytepixel;
}
return 0;
}
/*
* close BMP file
*/
void closeBMP(BMPINFO* bmpInfo)
{
if(NULL != bmpInfo->fp)
fclose(bmpInfo->fp);
}
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