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optimizations reading BMP file (monochrome)

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This commit is contained in:
Ronald 2020-10-31 23:34:38 +01:00
commit 008afbc0f5
1 changed files with 22 additions and 33 deletions
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55
RaspberryPi_JetsonNano/c/lib/GUI/GUI_BMPfile.c
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@ -62,20 +62,18 @@ UBYTE GUI_ReadBmp(const char *path, UWORD Xstart, UWORD Ystart)
// Binary file open
if((fp = fopen(path, "rb")) == NULL) {
Debug("Cann't open the file!\n");
Debug("Can't open the file!\n");
exit(0);
}
// Set the file pointer from the beginning
fseek(fp, 0, SEEK_SET);
fread(&bmpFileHeader, sizeof(BMPFILEHEADER), 1, fp); //sizeof(BMPFILEHEADER) must be 14
fread(&bmpInfoHeader, sizeof(BMPINFOHEADER), 1, fp); //sizeof(BMPFILEHEADER) must be 50
fread(&bmpInfoHeader, sizeof(BMPINFOHEADER), 1, fp); //sizeof(BMPINFOHEADER) must be 50
printf("pixel = %d * %d\r\n", bmpInfoHeader.biWidth, bmpInfoHeader.biHeight);
UWORD Image_Width_Byte = (bmpInfoHeader.biWidth % 8 == 0)? (bmpInfoHeader.biWidth / 8): (bmpInfoHeader.biWidth / 8 + 1);
UWORD Bmp_Width_Byte = (Image_Width_Byte % 4 == 0) ? Image_Width_Byte: ((Image_Width_Byte / 4 + 1) * 4);
UBYTE Image[Image_Width_Byte * bmpInfoHeader.biHeight];
memset(Image, 0xFF, Image_Width_Byte * bmpInfoHeader.biHeight);
UWORD Image_Width_Byte = (bmpInfoHeader.biWidth + 7) / 8;
UWORD Bmp_Width_Byte = (Image_Width_Byte + 3) & ~3;
// Determine if it is a monochrome bitmap
int readbyte = bmpInfoHeader.biBitCount;
@ -85,16 +83,11 @@ UBYTE GUI_ReadBmp(const char *path, UWORD Xstart, UWORD Ystart)
}
// Determine black and white based on the palette
UWORD i;
UWORD Bcolor, Wcolor;
UWORD bmprgbquadsize = pow(2, bmpInfoHeader.biBitCount);// 2^1 = 2
BMPRGBQUAD bmprgbquad[bmprgbquadsize]; //palette
// BMPRGBQUAD bmprgbquad[2]; //palette
for(i = 0; i < bmprgbquadsize; i++){
// for(i = 0; i < 2; i++) {
fread(&bmprgbquad[i], sizeof(BMPRGBQUAD), 1, fp);
}
fread(bmprgbquad, sizeof(BMPRGBQUAD), bmprgbquadsize, fp);
if(bmprgbquad[0].rgbBlue == 0xff && bmprgbquad[0].rgbGreen == 0xff && bmprgbquad[0].rgbRed == 0xff) {
Bcolor = BLACK;
Wcolor = WHITE;
@ -103,36 +96,32 @@ UBYTE GUI_ReadBmp(const char *path, UWORD Xstart, UWORD Ystart)
Wcolor = BLACK;
}
// Read image data into the cache
UWORD x, y;
UBYTE Rdata;
// Read image data and paint the pixels
UWORD x, xb, y, yp;
UDOUBLE Rdata[1];
UBYTE color;
fseek(fp, bmpFileHeader.bOffset, SEEK_SET);
for(y = 0; y < bmpInfoHeader.biHeight; y++) {//Total display column
for(x = 0; x < Bmp_Width_Byte; x++) {//Show a line in the line
if(fread((char *)&Rdata, 1, readbyte, fp) != readbyte) {
for(xb = 0; xb < Bmp_Width_Byte; xb+=sizeof Rdata) {//Show a line in the line
readbyte = sizeof Rdata;
if (Bmp_Width_Byte-xb < readbyte) readbyte=Bmp_Width_Byte-xb;
if(fread(Rdata, 1, readbyte, fp) != readbyte) {
perror("get bmpdata:\r\n");
break;
}
if(x < Image_Width_Byte) { //bmp
Image[x + (bmpInfoHeader.biHeight - y - 1) * Image_Width_Byte] = Rdata;
// printf("rdata = %d\r\n", Rdata);
}
UDOUBLE temp=be32toh(Rdata[0]);
yp = (bmpInfoHeader.biHeight - y - 1);
if (Ystart + yp >= Paint.Height) continue;
for (x=xb*8; x<(xb+sizeof Rdata)*8; x++) {
if(Xstart + x >= Paint.Width) break;
color = (temp & (1<<(sizeof Rdata*8-1))) ?Bcolor:Wcolor;
temp <<= 1;
Paint_SetPixel(Xstart + x, Ystart + yp, color);
}
}
}
fclose(fp);
// Refresh the image to the display buffer based on the displayed orientation
UBYTE color, temp;
for(y = 0; y < bmpInfoHeader.biHeight; y++) {
for(x = 0; x < bmpInfoHeader.biWidth; x++) {
if(x > Paint.Width || y > Paint.Height) {
break;
}
temp = Image[(x / 8) + (y * Image_Width_Byte)];
color = (((temp << (x%8)) & 0x80) == 0x80) ?Bcolor:Wcolor;
Paint_SetPixel(Xstart + x, Ystart + y, color);
}
}
return 0;
}
/*************************************************************************