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#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
typedef struct tagBITMAPFILEHEADER BITMAPFILEHEADER;
struct btagBITMAPFILEHEADER
{
WORD bfType; //specifies the file type
DWORD bfSize; //specifies the size in bytes of the bitmap file
WORD bfReserved1; //reserved; must be 0
WORD bfReserved2; //reserved; must be 0
DWORD bOffBits; //species the offset in bytes from the bitmapfileheader to the bitmap bits
};
typedef struct tagBITMAPINFOHEADER BITMAPINFOHEADER;
struct btagBITMAPINFOHEADER
{
DWORD biSize; //specifies the number of bytes required by the struct
LONG biWidth; //specifies width in pixels
LONG biHeight; //species height in pixels
WORD biPlanes; //specifies the number of color planes, must be 1
WORD biBitCount; //specifies the number of bit per pixel
DWORD biCompression;//spcifies the type of compression
DWORD biSizeImage; //size of image in bytes
LONG biXPelsPerMeter; //number of pixels per meter in x axis
LONG biYPelsPerMeter; //number of pixels per meter in y axis
DWORD biClrUsed; //number of colors used by th ebitmap
DWORD biClrImportant; //number of colors that are important
};
unsigned char *LoadBitmapFile(char *filename, BITMAPINFOHEADER *bitmapInfoHeader)
{
FILE *filePtr; //our file pointer
BITMAPFILEHEADER bitmapFileHeader; //our bitmap file header
unsigned char *bitmapImage; //store image data
int imageIdx=0; //image index counter
unsigned char tempRGB; //our swap variable
int i,j,k;
SDL_Surface *surface = NULL;
SDL_Rect p;
//open filename in read binary mode
filePtr = fopen(filename,"rb");
if (filePtr == NULL)
return NULL;
//read the bitmap file header
fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER),1,filePtr);
//verify that this is a bmp file by check bitmap id
if (bitmapFileHeader.bfType !=0x4D42)
{
fclose(filePtr);
return NULL;
}
//read the bitmap info header
fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER),1,filePtr);
//move file point to the begging of bitmap data
fseek(filePtr, bitmapFileHeader.bfOffBits, SEEK_SET);
//allocate enough memory for the bitmap image data
bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage);
//verify memory allocation
if (!bitmapImage)
{
free(bitmapImage);
fclose(filePtr);
return NULL;
}
//read in the bitmap image data
fread(bitmapImage,bitmapInfoHeader->biSizeImage,1,filePtr);
//make sure bitmap image data was read
if (bitmapImage == NULL)
{
fclose(filePtr);
return NULL;
}
//swap the r and b values to get RGB (bitmap is BGR)
for (imageIdx = 0;imageIdx < bitmapInfoHeader->biSizeImage;imageIdx+=3)
{
tempRGB = bitmapImage[imageIdx];
bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
bitmapImage[imageIdx + 2] = tempRGB;
}
// Affichage de l'image bitmap
k=0;
for(i=0; i<bitmapInfoHeader->biHeight; i++)
{
for(j=0; j<bitmapInfoHeader->biWidth; j++)
{
p.x = i;
p.y = j;
ColorRGB color;
color.r = bitmapImage[k];
color.r = bitmapImage[k+1];
color.r = bitmapImage[k+2];
PutPixel(x,y,color);
k+=3;
}
}
//close file and return bitmap iamge data
fclose(filePtr);
return bitmapImage;
}
int main()
{
BITMAPINFOHEADER bitmapInfoHeader;
unsigned char *bitmapData;
bitmapData = LoadBitmapFile("image.bmp",&bitmapInfoHeader);
} |
Afficher image bitmap déjà chargé en mémoire (tableau data)
Envoyé par qoqo1
Salut,
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