Alright, I have a loadBMP function, but it doesn't actually load the BMP for some reason. the function and everything is contained in a header, which is included in Unit1.cpp
this is how I use it...
...
BITMAP_FILE bitmap;
....
//load background
if(!LoadBMP(&bitmap,"lvl2.bmp"))
Application->MessageBoxA("Can't load BMP","ERORR",MB_OK); GameKill();
I trace through, and it errors out at the line indicated
if(bitmap->bitmapinfoheader.biBitCount == 8 || bitmap->bitmapinfoheader.biBitCount == 16 ||
bitmap->bitmapinfoheader.biBitCount == 24)
{
//delete the alst image if there was one
if(bitmap->buffer)
delete bitmap->buffer;
//allocate the memory for the image
if(!(bitmap->buffer = (UCHAR *)malloc(bitmap->bitmapinfoheader.biSizeImage)))
{
//close the file
_lclose(file_handle);
//return error
return(0);
}
//now read it in
_lread(file_handle,bitmap->buffer, bitmap->bitmapinfoheader.biSizeImage);
}
else
{
//WOW! Serious error!
return(0);<<<-------------- THIS LINE <<----------
}
I check the value of biSizeImage and its 24.....So why doesn't that fit the clause in the if statment?
All that happens is that I get the message saying It wasn't loaded(at the indicated line). Any ideas?
I've attached the header file below
Many thanks
//this was taken from André LaMoth's "Tricks of the windows game programming gurus"
//p.346 2nd Revision
//NOTE:
//assumes your not stupid and arn't asking it to load a non-BMP file. the code is commented out for that
#include "Unit1.h"
#define BITMAP_ID 0x4D42 // universal id for a bitmap
#define MAX_COLORS_PALETTE 256
//////container structure for bitmap files///////////////////////////////////////
typedef struct BITMAP_FILE_TAG
{
BITMAPFILEHEADER bitmapfileheader; // this contains the bitmapfile header
BITMAPINFOHEADER bitmapinfoheader; // this is all the info including the palette
PALETTEENTRY palette[256]; // we will store the palette here
UCHAR *buffer; // this is a pointer to the data
} BITMAP_FILE, *BITMAP_FILE_PTR;
// PROTOTYPES //////////////////////////////////////////////
int Flip_Bitmap(UCHAR *image, int bytes_per_line, int height);
int LoadBMP(BITMAP_FILE_PTR bitmap, char *filename);
int Unload_Bitmap_File(BITMAP_FILE_PTR bitmap);
//LOAD///////////////////////////////////////////////////////////////////////////
int LoadBMP(BITMAP_FILE_PTR bitmap, char *filename)
{
//this function opens a *.BMP file
int file_handle; //the file handle
int i; //looping var
UCHAR *temp_buffer = NULL; //used to convert 24 bit images to 16bit
OFSTRUCT file_data; // file data information
//open file if it exists
if((file_handle = OpenFile(filename,&file_data,OF_READ)) == -1)
return(0); //Opening failed
//load the bitmap header
_lread(file_handle,&bitmap->bitmapfileheader,sizeof(BITMAPFILEHEADER));
/* //TEST IF THIS IS A BITMAP FILE
if (bitmap->bitmapfileheader.bfType != BITMAP_ID)
{
//this definatly isn't a bitmap, so lets unload 'er
_lclose(file_handle);
//return error
return(0);
} */
//Now lets read in the infoheader
_lread(file_handle, &bitmap->bitmapinfoheader,sizeof(BITMAPINFOHEADER));
//NOW LOAD THE COLOR PALETTE IF THERE IS ONE
if(bitmap->bitmapinfoheader.biBitCount == 8)
{
_lread(file_handle, &bitmap->palette,MAX_COLORS_PALETTE*sizeof(PALETTEENTRY));
//Now set all the flags in the palette correctly and fix the reversed BGR RGBQUAD
for(i = 0; i < MAX_COLORS_PALETTE; i++)
{
int temp_color = bitmap->palette.peRed;
bitmap->palette.peRed = bitmap->palette.peBlue;
bitmap->palette.peBlue = temp_color;
bitmap->palette.peFlags = PC_NOCOLLAPSE;
}
}
//image data
_lseek(file_handle, -(int)(bitmap->bitmapinfoheader.biSizeImage),SEEK_END);
// now read in the image, if the image is 8 or 16 bit then simply read it
// but if its 24 bit then read it into a temporary area and then convert
// it to a 16 bit image
if(bitmap->bitmapinfoheader.biBitCount == 8 || bitmap->bitmapinfoheader.biBitCount == 16 ||
bitmap->bitmapinfoheader.biBitCount == 24)
{
//delete the alst image if there was one
if(bitmap->buffer)
delete bitmap->buffer;
//allocate the memory for the image
if(!(bitmap->buffer = (UCHAR *)malloc(bitmap->bitmapinfoheader.biSizeImage)))
{
//close the file
_lclose(file_handle);
//return error
return(0);
}
//now read it in
_lread(file_handle,bitmap->buffer, bitmap->bitmapinfoheader.biSizeImage);
}
else
{
//WOW! Serious error!
return(0);
}
//close the file
_lclose(file_handle);
//flip the bitmap
Flip_Bitmap(bitmap->buffer,
bitmap->bitmapinfoheader.biWidth*(bitmap->bitmapinfoheader.biBitCount/8),
bitmap->bitmapinfoheader.biHeight);
// return success
return(1);
}
/////UNLOAD//////////////////////////////////////////////////////////////////////
int Unload_Bitmap_File(BITMAP_FILE_PTR bitmap)
{
// this function releases all memory associated with "bitmap"
if (bitmap->buffer)
{
// release memory
delete (bitmap->buffer);
// reset pointer
bitmap->buffer = NULL;
} // end if
// return success
return(1);
}
//// FLIP ///////////////////////////////////////////////////////
int Flip_Bitmap(UCHAR *image, int bytes_per_line, int height)
{
// this function is used to flip bottom-up .BMP images
UCHAR *buffer; // used to perform the image processing
int index; // looping index
// allocate the temporary buffer
if (!(buffer = (UCHAR *)malloc(bytes_per_line*height)))
return(0);
// copy image to work area
memcpy(buffer,image,bytes_per_line*height);
// flip vertically
for (index=0; index < height; index++)
memcpy(ℑ[((height-1) - index)*bytes_per_line], &buffer[index*bytes_per_line], bytes_per_line);
// release the memory
free(buffer);
// return success
return(1);
}
