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Add GUI_ReadBmp_16Gray function

This commit is contained in:
mbartlett21 2022-10-03 10:35:40 +10:00
parent 1db3516bac
commit dbcee5e5a2
2 changed files with 81 additions and 0 deletions
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80
RaspberryPi_JetsonNano/c/lib/GUI/GUI_BMPfile.c
View File

@ -205,6 +205,86 @@ UBYTE GUI_ReadBmp_4Gray(const char *path, UWORD Xstart, UWORD Ystart)
return 0;
}
UBYTE GUI_ReadBmp_16Gray(const char *path, UWORD Xstart, UWORD Ystart)
{
FILE *fp; //Define a file pointer
BMPFILEHEADER bmpFileHeader; //Define a bmp file header structure
BMPINFOHEADER bmpInfoHeader; //Define a bmp info header structure
// Binary file open
if((fp = fopen(path, "rb")) == NULL) {
Debug("Cann'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
printf("pixel = %d * %d\r\n", bmpInfoHeader.biWidth, bmpInfoHeader.biHeight);
// They are both the same width in bytes
// round up to the next byte
UWORD Width_Byte = (bmpInfoHeader.biWidth + 1) / 2;
UBYTE Image[Width_Byte * bmpInfoHeader.biHeight];
memset(Image, 0xFF, Width_Byte * bmpInfoHeader.biHeight);
// Determine if it is a monochrome bitmap
int readbyte = bmpInfoHeader.biBitCount;
printf("biBitCount = %d\r\n",readbyte);
if(readbyte != 4) {
Debug("Bmp image is not a 4-bit bitmap!\n");
exit(0);
}
// Determine colors based on the palette
// A map from palette entry to color
UBYTE colors[16];
UBYTE i;
BMPRGBQUAD rgbData;
for (i = 0; i < 16; i++){
fread(&rgbData, sizeof(BMPRGBQUAD), 1, fp);
// Work out the closest colour
// 16 colours over 0-255 => 0-8 => 0, 9-25 => 1 (17), 26-42 => 2 (34), etc
// Base it on red
colors[i] = (rgbData.rgbRed + 8) / 17;
}
// Read image data into the cache
UWORD x, y;
UBYTE Rdata;
fseek(fp, bmpFileHeader.bOffset, SEEK_SET);
for (y = 0; y < bmpInfoHeader.biHeight; y++) {//Total display column
for (x = 0; x < Width_Byte; x++) {//Show a line in the line
if (fread((char *) &Rdata, 1, 1, fp) != 1) {
perror("get bmpdata:\r\n");
break;
}
Image[x + (bmpInfoHeader.biHeight - y - 1) * Width_Byte] = Rdata;
}
}
fclose(fp);
// Refresh the image to the display buffer based on the displayed orientation
UBYTE coloridx;
printf("bmpInfoHeader.biWidth = %d\r\n", bmpInfoHeader.biWidth);
printf("bmpInfoHeader.biHeight = %d\r\n", bmpInfoHeader.biHeight);
for (y = 0; y < bmpInfoHeader.biHeight; y++) {
for (x = 0; x < bmpInfoHeader.biWidth; x++) {
if (Xstart + x > Paint.Width || Ystart + y > Paint.Height)
break;
coloridx = (Image[x / 2 + y * Width_Byte] >> ((x % 2) ? 0 : 4)) & 15;
Paint_SetPixel(Xstart + x, Ystart + y, colors[coloridx]);
}
}
return 0;
}
UBYTE GUI_ReadBmp_RGB_7Color(const char *path, UWORD Xstart, UWORD Ystart)
{

1
RaspberryPi_JetsonNano/c/lib/GUI/GUI_BMPfile.h
View File

@ -87,6 +87,7 @@ typedef struct RGB_QUAD {
UBYTE GUI_ReadBmp(const char *path, UWORD Xstart, UWORD Ystart);
UBYTE GUI_ReadBmp_4Gray(const char *path, UWORD Xstart, UWORD Ystart);
UBYTE GUI_ReadBmp_16Gray(const char *path, UWORD Xstart, UWORD Ystart);
UBYTE GUI_ReadBmp_RGB_4Color(const char *path, UWORD Xstart, UWORD Ystart);
UBYTE GUI_ReadBmp_RGB_7Color(const char *path, UWORD Xstart, UWORD Ystart);
#endif