Diff: zz_common/draw_bitmap.cpp

Revision:

3:35ac9ee7d2d6

diff -r 2712267970df -r 35ac9ee7d2d6 zz_common/draw_bitmap.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/zz_common/draw_bitmap.cpp	Wed Aug 07 05:39:01 2019 +0000
@@ -0,0 +1,133 @@
+//  https://os.mbed.com/users/okano/code/bmp_8bit_per_pixel_format/
+
+#if 0
+
+#include "mbed.h"                   //  for mbed
+LocalFileSystem     local("local"); //  for mbed to access local file system
+ 
+/*
+ *
+ *   BMP file data handler sample
+ *
+ *      reference : http://www.umekkii.jp/data/computer/file_format/bitmap.cgi
+ *
+ */
+ 
+#include    <stdio.h>
+ 
+//#define        SOURCE_FILE            "/local/small.bmp"
+#define        SOURCE_FILE            "/local/pre4.bmp"
+//#define        SOURCE_FILE            "pre_dsp_4.bmp"
+ 
+#define        BUFFER_SIZE            1024
+ 
+typedef struct  bmp_header_st    {
+    unsigned short  bfType            __attribute__((packed));
+    unsigned long   bfSize            __attribute__((packed));
+    unsigned short  bfReserved1       __attribute__((packed));
+    unsigned short  bfReserved2       __attribute__((packed));
+    unsigned long   bfOffBits         __attribute__((packed));
+ 
+    unsigned long   biSize            __attribute__((packed));
+    long            biWidth           __attribute__((packed));
+    long            biHeight          __attribute__((packed));
+    unsigned short  biPlanes          __attribute__((packed));
+    unsigned short  biBitCount        __attribute__((packed));
+    unsigned long   biCompression     __attribute__((packed));
+    unsigned long   biSizeImage       __attribute__((packed));
+    long            biXPixPerMeter    __attribute__((packed));
+    long            biYPixPerMeter    __attribute__((packed));
+    unsigned long   biClrUsed         __attribute__((packed));
+    unsigned long   biCirImportant    __attribute__((packed));
+}
+bmp_header;
+ 
+typedef struct  color_palette_st    {
+    unsigned char    red;
+    unsigned char    green;
+    unsigned char    blue;
+    unsigned char    dummy;
+}
+color_palette;
+ 
+ 
+int main() {
+    unsigned char    buffer[ BUFFER_SIZE ];
+    FILE             *fs;
+    bmp_header       bh;
+    color_palette    cp[256];
+    unsigned long    readsize;
+    unsigned long    i;
+    unsigned long    ofset    = 0;
+ 
+    printf( "BMP file access sample\r\n");
+ 
+    if ( NULL == (fs    = fopen( SOURCE_FILE, "rb" )) ) {
+        printf( "file open error when oening file \"%s\"\r\n", SOURCE_FILE );
+        return ( 1 );
+    }
+ 
+    /*
+     *   reading header
+     */
+ 
+    fread( &bh, sizeof( bh ), 1, fs );
+ 
+    printf( "  bfType         : 0x%04X\r\n", bh.bfType );
+    printf( "  bfSize         : %ld\r\n",    bh.bfSize );
+    printf( "  bfOffBits      : %ld\r\n",    bh.bfOffBits );
+    printf( "  biSize         : %lu\r\n",    bh.biSize );
+    printf( "  biWidth        : %ld\r\n",    bh.biWidth );
+    printf( "  biHeight       : %ld\r\n",    bh.biHeight );
+    printf( "  biPlanes       : %d\r\n",     bh.biPlanes );
+    printf( "  biBitCount     : %d\r\n",     bh.biBitCount );
+    printf( "  biCompression  : %lu\r\n",    bh.biCompression );
+    printf( "  biSizeImage    : %lu\r\n",    bh.biSizeImage );
+    printf( "  biXPixPerMeter : %ld\r\n",    bh.biXPixPerMeter );
+    printf( "  biYPixPerMeter : %ld\r\n",    bh.biYPixPerMeter );
+    printf( "  biClrUsed      : %lu\r\n",    bh.biClrUsed );
+    printf( "  biCirImportant : %lu\r\n",    bh.biCirImportant );
+ 
+    /*
+     *   checking header
+     */
+ 
+    if ( (bh.bfType != 0x4D42)
+            || (bh.bfOffBits != 54 + 256 * sizeof( color_palette ) )
+            || (bh.biBitCount != 8)
+            || (bh.biCompression != 0)
+       ) {
+        printf( "unsupported file format\r\n" );
+        return ( 1 );
+    }
+ 
+    /*
+     *   header information
+     */
+ 
+    printf( "header read, the image data size is %lu bytes\r\n", bh.bfSize );
+    printf( "   the image data size is %lu bytes\r\n", bh.biSizeImage );
+    printf( "   horizontal size %lu pixels\r\n", bh.biWidth );
+    printf( "   vertical   size %lu pixels\r\n", bh.biHeight );
+ 
+    /*
+     *   read color palette
+     */
+ 
+    for ( i = 0; i < 256; i++ ) {
+        fread( &(cp[i]), sizeof( color_palette ), 1, fs );
+//        printf( "cp 0x%02X : 0x%02X - 0x%02X - 0x%02X\r\n", i, (cp[i]).red, (cp[i]).green, (cp[i]).blue );
+    }
+ 
+ 
+    while ( 0 != (readsize    = fread( buffer, sizeof( unsigned char ) , BUFFER_SIZE, fs )) ) {
+        for ( i = 0; i < readsize; i++ ) {
+//            printf( "  %6lX : 0x%02X, 0x%02X, 0x%02X\r\n", ofset, cp[ buffer[i] ].red, cp[ buffer[i] ].green, cp[ buffer[i] ].blue );
+            ofset++;
+        }
+    }
+ 
+    printf( "done.\r\n\r\n" );
+}
+
+#endif
\ No newline at end of file