Olli Vanhoja / gfxLcd

Very simple library for controlling small graphic LCDs

Dependents:   LCD

bitmap.cpp@0:573607103077, 2011-03-03 (annotated)

Committer:
HBP
Date:
Thu Mar 03 00:28:24 2011 +0000
Revision:
0:573607103077
Child:
2:183b861fba00
Initial release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
HBP 0:573607103077 1 #include "bitmap.h"
HBP 0:573607103077 2
HBP 0:573607103077 3 #define X_MAX 160
HBP 0:573607103077 4 #define Y_MAX 32
HBP 0:573607103077 5
HBP 0:573607103077 6 extern Serial pc(USBTX, USBRX);
HBP 0:573607103077 7
HBP 0:573607103077 8 bitmapImage::bitmapImage(char *inputFilename)
HBP 0:573607103077 9 {
HBP 0:573607103077 10 filename = inputFilename;
HBP 0:573607103077 11
HBP 0:573607103077 12 pc.printf("Opening file %s...", filename);
HBP 0:573607103077 13 fp = fopen(filename, "rb");
HBP 0:573607103077 14 if(fp != NULL)
HBP 0:573607103077 15 pc.printf(" OK\n\r");
HBP 0:573607103077 16 else {
HBP 0:573607103077 17 fclose(fp);
HBP 0:573607103077 18 error("");
HBP 0:573607103077 19 }
HBP 0:573607103077 20
HBP 0:573607103077 21 // check to see if it is a valid bitmap file
HBP 0:573607103077 22 if(fgetc(fp)!='B' || fgetc(fp)!='M')
HBP 0:573607103077 23 {
HBP 0:573607103077 24 fclose(fp);
HBP 0:573607103077 25 error("");
HBP 0:573607103077 26 }
HBP 0:573607103077 27
HBP 0:573607103077 28 //fseek(fp, 0L, SEEK_END);
HBP 0:573607103077 29
HBP 0:573607103077 30 // Get BMP info
HBP 0:573607103077 31 fileInfo.cols = readImageInfo(0x12, 4);
HBP 0:573607103077 32 fileInfo.rows = readImageInfo(0x16, 4);
HBP 0:573607103077 33 fileSize = readImageInfo(2, 4);
HBP 0:573607103077 34 fileInfo.nColors = readImageInfo(0x2E, 4);
HBP 0:573607103077 35 // Assume we are working with a 8-bit file
HBP 0:573607103077 36 if (fileInfo.nColors == 0) fileInfo.nColors = 256;
HBP 0:573607103077 37 fileInfo.offset = readImageInfo(0x0A, 4);
HBP 0:573607103077 38 fileInfo.bitsPP = (uint16_t)readImageInfo(0x1C, 2);
HBP 0:573607103077 39
HBP 0:573607103077 40 // Print info
HBP 0:573607103077 41 pc.printf("\n\rBMP file %s:\n\r", filename);
HBP 0:573607103077 42 pc.printf("Width: %d\n\r", fileInfo.cols);
HBP 0:573607103077 43 pc.printf("Height: %d\n\r", fileInfo.rows);
HBP 0:573607103077 44 pc.printf("File size: %ld\n\r", fileSize);
HBP 0:573607103077 45 pc.printf("# Colors: %d\n\r", fileInfo.nColors);
HBP 0:573607103077 46 pc.printf("Offset: %d\n\r", fileInfo.offset);
HBP 0:573607103077 47 pc.printf("Bits per pixel: %d\n\r", fileInfo.bitsPP);
HBP 0:573607103077 48 //pc.printf("Vector size: %d\n\r", vectorSize);
HBP 0:573607103077 49 }
HBP 0:573607103077 50
HBP 0:573607103077 51 bitmapImage::~bitmapImage()
HBP 0:573607103077 52 {
HBP 0:573607103077 53 fclose(fp);
HBP 0:573607103077 54 }
HBP 0:573607103077 55
HBP 0:573607103077 56 void bitmapImage::drawImage(gfxLcd *glcd, int xOffset, int yOffset)
HBP 0:573607103077 57 {
HBP 0:573607103077 58 // Start at beginning of raster data
HBP 0:573607103077 59 fseek(fp, fileInfo.offset, SEEK_SET);
HBP 0:573607103077 60 int32_t offsettedX, offsettedY;
HBP 0:573607103077 61
HBP 0:573607103077 62 uint32_t x=0, y=fileInfo.rows-1;
HBP 0:573607103077 63 for(uint32_t index=0; index < fileInfo.rows*(fileInfo.cols/8); index++)
HBP 0:573607103077 64 {
HBP 0:573607103077 65 char c=fgetc(fp);
HBP 0:573607103077 66 for(char b=0; b < 8; b++)
HBP 0:573607103077 67 {
HBP 0:573607103077 68 char mask = 0x80 >> b;
HBP 0:573607103077 69 offsettedX = (int32_t)x+xOffset;
HBP 0:573607103077 70 offsettedY = (int32_t)y+yOffset;
HBP 0:573607103077 71
HBP 0:573607103077 72 if((offsettedX <= X_MAX) && (offsettedY <= Y_MAX) && (offsettedX >= 0) && (offsettedY >= 0))
HBP 0:573607103077 73 {
HBP 0:573607103077 74 glcd->putPixel(offsettedX, offsettedY, ~c&mask);
HBP 0:573607103077 75 }
HBP 0:573607103077 76 x++;
HBP 0:573607103077 77
HBP 0:573607103077 78 if (x == fileInfo.cols)
HBP 0:573607103077 79 {
HBP 0:573607103077 80 x=0;
HBP 0:573607103077 81 y--;
HBP 0:573607103077 82 }
HBP 0:573607103077 83 if (y == 0)
HBP 0:573607103077 84 return;
HBP 0:573607103077 85 }
HBP 0:573607103077 86 }
HBP 0:573607103077 87 }
HBP 0:573607103077 88
HBP 0:573607103077 89 uint32_t bitmapImage::readImageInfo(long offset, int n)
HBP 0:573607103077 90 {
HBP 0:573607103077 91 long value = 0L;
HBP 0:573607103077 92 char c;
HBP 0:573607103077 93 int i;
HBP 0:573607103077 94
HBP 0:573607103077 95 fseek(fp, offset, SEEK_SET);
HBP 0:573607103077 96
HBP 0:573607103077 97 for(i=0; i < n; i++)
HBP 0:573607103077 98 {
HBP 0:573607103077 99 fread(&c, sizeof(char), 1, fp);
HBP 0:573607103077 100 /* calculate value based on adding bytes */
HBP 0:573607103077 101 value = (long)(value + (c)*((long)pow((long double)256, (int)(i))));
HBP 0:573607103077 102 }
HBP 0:573607103077 103
HBP 0:573607103077 104 return value;
HBP 0:573607103077 105 }